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WO2018139631A1 - Dispositif d'étanchéité en résine et procédé d'étanchéité en résine - Google Patents

Dispositif d'étanchéité en résine et procédé d'étanchéité en résine Download PDF

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Publication number
WO2018139631A1
WO2018139631A1 PCT/JP2018/002656 JP2018002656W WO2018139631A1 WO 2018139631 A1 WO2018139631 A1 WO 2018139631A1 JP 2018002656 W JP2018002656 W JP 2018002656W WO 2018139631 A1 WO2018139631 A1 WO 2018139631A1
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WO
WIPO (PCT)
Prior art keywords
mold
cavity
resin
uncured resin
plunger
Prior art date
Application number
PCT/JP2018/002656
Other languages
English (en)
Japanese (ja)
Inventor
義和 大谷
寛治 森
光 高橋
Original Assignee
信越エンジニアリング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 信越エンジニアリング株式会社 filed Critical 信越エンジニアリング株式会社
Publication of WO2018139631A1 publication Critical patent/WO2018139631A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the groups H01L21/18 - H01L21/326 or H10D48/04 - H10D48/07 e.g. sealing of a cap to a base of a container
    • H01L21/56—Encapsulations, e.g. encapsulation layers, coatings

Definitions

  • the present invention relates to a resin sealing apparatus used for manufacturing a molded product in which a workpiece on which a semiconductor element is mounted is manufactured in order to create a package such as a semiconductor package, and a resin sealing for manufacturing the package. It relates to the stopping method.
  • an upper mold having a holding mechanism for holding a substrate on the lower surface, and a lower mold having a cavity located below the upper mold, on which a semiconductor chip is mounted.
  • a compression molding device that holds the upper mold and clamps the lower mold and the upper mold by lowering the upper mold with respect to the lower mold after the resin is supplied to the cavity (see, for example, Patent Document 1). .
  • molding is performed by heating and pressing the resin, and a sealing body made of the resin is formed on the lower surface side of the substrate.
  • the substrate is transported to the lower surface of the upper mold by the carry-in transport unit, and the substrate is vacuum-sucked and held by the holding mechanism.
  • the resin is an epoxy resin powder resin.
  • the lower mold After being supplied to the cavity by the powder resin metering unit and the powder resin supply unit, the resin is melted by heating.
  • the lower mold includes a pair of flow cavities formed of depressions positioned on the outside of a pair of long sides in a rectangular cavity, a plurality of flow gates formed of grooves communicating with the cavity and the flow cavities, and a pair of short sides on the cavity. And an air vent composed of a continuous groove. Resin melted by clamping the lower mold and the upper mold flows into the pair of flow cavities, and the air remaining in the cavities is discharged out of the cavities by the air vent.
  • the upper mold is provided with two (flow cavity) plungers facing the pair of flow cavities of the lower mold. After clamping the lower mold and the upper mold, the two plungers enter the pair of flow cavities.
  • the melted resin in the pair of flow cavities is pressurized by the intrusion of the two plungers, so that the pressure of the resin in the cavities by mold clamping and the pressure of the resin in the pair of flow cavities are reduced. It is set to be the same. As a result, since the resin in the entire cavity is cured under an appropriate pressure, generation of bubbles (voids) inside the sealing body is suppressed. After that, the sealing body is taken out by releasing the lower mold and the upper mold.
  • mold molding that forms a sealed body includes an epoxy resin that is thermally decomposed and melted by heating, increases in viscosity with time from the melted state, and is thermoset and solidified in a relatively short time. Used.
  • the resin that has entered the gap between the hole and the plunger is an epoxy resin
  • the resin hardens and solidifies in a short time, so that the smooth movement of the plunger is hindered, causing malfunction and causing failure.
  • the yield decreases. Since the resin that has entered the gap between the hole and the plunger and solidified adheres to the gap, even if the lower mold and upper mold are released, the molded molded body cannot be taken out smoothly, requiring a long tact time As a result, the productivity was inferior. Therefore, in order to solve such problems, it is conceivable to remove the solidified resin that has entered the gap by disassembly and cleaning of the upper mold and the plunger.
  • the powder resin is melted after being supplied to the cavity as a resin, it is very difficult to supply the powder resin with a uniform thickness over the entire surface of the cavity, and the powder resin is concentrated and concentrated in a part of the cavity. Sometimes it was supplied. In this case, since the molten resin flows over a wide area toward the entire cavity, unevenness in the resin due to non-uniform flow friction (flow spots) occurs, or from the cavity due to mold clamping to the two flow cavities. There is a problem that a difference occurs in the amount of inflow of the resin or a cause of quality deterioration.
  • the structure of the entire apparatus is as much as the substrate carry-in transfer unit, the powder resin weighing unit and the powder resin supply unit are necessary. There was also a problem that it was complicated and maintenance was troublesome.
  • a resin sealing device is a resin sealing device that manufactures a molded product in which a workpiece on which a semiconductor element is mounted is resin-sealed.
  • a first mold having a pressing portion of the workpiece, and a second mold having a cavity that is provided opposite to a mounting surface on which the semiconductor element of the workpiece is mounted and is supplied with uncured resin,
  • An openable / closable sealed chamber formed between the first mold and the second mold, and either one or both of the first mold and the second mold are the first mold and the second mold.
  • a drive unit that moves relatively close to the opposing direction of the second mold, a pressurizing mechanism that includes a plunger that pressurizes the uncured resin in the cavity in the sealed chamber, and controls the operation of the drive unit and the plunger.
  • Control unit The pressurizing mechanism is provided with the uncured resin overflow channel provided continuously to the cavity in the second mold in the sealed chamber, and the second mold toward the overflow channel.
  • the first mold is provided to face the cavity, and the second mold is provided to face the overflow channel.
  • the part is a relative approaching movement of the first mold and the second mold by the drive unit, and the placement surface of the workpiece and the semiconductor element are immersed in the uncured resin in the cavity, With this immersion, the uncured resin in the cavity is While flowing out the flow path, characterized in that the plunger is controlled to protrude to move to the overflow path towards the third tegmentum site.
  • the resin sealing method according to the present invention is a resin sealing method for manufacturing a molded product in which a workpiece on which a semiconductor element is mounted is resin-sealed, in the direction opposite to the first molding die and the second molding die.
  • a sealing chamber is formed between the molding dies, a mounting surface on which the semiconductor element of the workpiece is mounted, and an immersion step of immersing the semiconductor element in the uncured resin in the cavity; Continuously with the cavity
  • the compression process of the uncured resin that pressurizes the uncured resin that has flowed into the overflow channel provided in the second mold by the protruding movement of the plunger provided in the second mold, and
  • FIG. 1 is a longitudinal sectional view taken along line (1)-(1) in FIG.
  • the resin sealing apparatus A includes a plurality of or a single semiconductor element C mounted on a work W in a semiconductor assembly process, and a substrate terminal and a semiconductor of the work W.
  • This is an apparatus for manufacturing a molded product M in which a product in which the element C is connected by a connecting member C1 such as a wire is cured by being pressure sealed with an uncured resin R around the connecting member C1. Accordingly, the molded product M can protect the semiconductor element C and the connection member C1 of the product from factors such as impact, temperature, and humidity.
  • Examples of the workpiece W include a substrate made of silicon wafer, glass, metal sheet, glass cloth, BT resin, or the like, or a similar one.
  • Examples of the semiconductor element C include chip-shaped electronic components such as semiconductor chips.
  • the connection member C1 include bumps and wires.
  • the uncured resin R a sheet, powder, granule, gel or the like is used.
  • Examples of the material of the uncured resin R include thermosetting resins such as epoxy resins.
  • the molded product M manufactured by the resin sealing device A is generally subjected to a dividing process such as dicing to complete a package such as a semiconductor package as a final product.
  • the resin sealing device A is provided with the first mold 1 having the pressing portion 11 of the workpiece W and the mounting surface W1 of the workpiece W so as to face the cavity 21.
  • the second mold 2, the openable / closable sealed chamber 31 formed between the first mold 1 and the second mold 2, and either the first mold 1 or the second mold 2, or A drive unit 4 for raising and lowering both of them relatively close to each other in the opposing direction of the first mold 1 and the second mold 2 to clamp the mold is provided as a main component. Further, if necessary, the internal pressure of the sealed chamber 31 formed between the first mold 1 and the second mold 2 by relative approaching movement is changed from the atmospheric atmosphere AP to the reduced-pressure atmosphere DP having a predetermined degree of vacuum.
  • the release sheet S is a film made of a heat-resistant material having excellent elasticity such as fluororesin such as Aflex (registered trademark) or ETFE or silicone, and is formed to have a size larger than that of the workpiece W or the cavity 21, The thickness is set to about 20 ⁇ m to 150 ⁇ m. Further, by pressurizing and compressing the uncured resin R in the cavity 21, it is possible to create a mold that does not generate bubbles (voids) inside the resin-sealed molded product M.
  • the resin sealing device A is configured to adjust the pressure in the sealed chamber 31 by exhausting or supplying air to the sealed chamber 31 and the external space O, and the cavity 21.
  • a positioning part 6 for the release sheet S (first release sheet S1) and a pressurizing mechanism 7 for compressing the uncured resin R are provided.
  • the pressure adjusting unit 5, the positioning unit 6, the pressurizing mechanism 7, etc. are electrically communicated with the control unit 8 and are controlled by the control unit 8.
  • the first mold 1 and the second mold 2 are usually arranged so as to face each other in the vertical direction as shown in FIGS. 1 to 9, and the upper first mold 1 and the lower second mold 2 are arranged.
  • Z direction The direction in which the mold 2 approaches or isolates is hereinafter referred to as “Z direction”.
  • XY direction A direction along the workpiece W that intersects the Z direction is hereinafter referred to as an “XY direction”.
  • a disk-shaped silicon wafer is used as the workpiece W.
  • a substrate made of glass, a metal sheet, a glass cloth, a BT resin, or the like or a similar one is held (suspended),
  • the outer shape can be changed to a rectangular shape (a quadrilateral having a right angle including a rectangle and a square).
  • the first mold 1 is formed in a flat plate shape having a thickness that does not deform (bend) with a rigid body such as metal, and on the surface thereof, the non-mounting surface W2 and Z opposite to the mounting surface W1 of the workpiece W are formed. It has the press part 11 which opposes to a direction. The pressing portion 11 of the first mold 1 comes into contact with the non-mounting surface W2 of the work W at a predetermined timing, and the mounting surface W1 of the work W and the semiconductor element C are cavities 21 of the second mold 2 described later.
  • the mounting surface W1 of the workpiece W and the semiconductor element C are immersed in the uncured resin R in the cavity 21, and the mold clamping is performed to press the workpiece W and the uncured resin R.
  • the pressing portion 11 of the first mold 1 is opposed to a cavity 21 described later and a first covered portion 11f provided in the Z direction, and an overflow channel 71 of the pressurizing mechanism 7 described later is opposed to the Z direction.
  • a second covered portion 11t provided opposite to a plunger 72 of the pressurizing mechanism 7 to be described later in the Z direction.
  • the second lid portion 11s and the third lid portion 11t are formed in an annular shape or a frame shape on the outside of the first lid portion 11f, respectively.
  • the first covered part 11f, the second covered part 11s, and the third covered part 11t are continuously formed without mutual boundaries.
  • the first mold 1 is an upper mold arranged on the substrate side of the molding.
  • a smooth pressing portion 11 is formed in the central portion or the entire inner surface of the upper mold so as to come into contact with the non-mounting surface W2 of the workpiece W.
  • the pressing portion 11 is used in the pressure reducing process described later in FIG. 3A from the initial state of FIGS. Is kept away from the non-mounting surface W2 of the workpiece W so that they are not in contact with each other.
  • the pressing portion 11 is in contact with the non-mounting surface W2 of the workpiece W.
  • a release sheet S (second release sheet S2) between the pressing portion 11 and the non-mounting surface W2 of the workpiece W.
  • the cavity of the second mold 2 to be described later with the workpiece W and the second release sheet S2 placed on the workpiece W. It is carried toward 21 and set on the uncured resin R in the cavity 21.
  • the workpiece W and the second release sheet S2 are sequentially loaded into the cavity 21 of the second mold 2 and set on the uncured resin R in the cavity 21, respectively. It can be changed.
  • the second molding die 2 is formed as a flat plate having a thickness that does not deform (bend) with a rigid body such as metal, and is opposed to the mounting surface W1 of the workpiece W on which the semiconductor element C is mounted in the Z direction.
  • the surface of 2 has a cavity 21 to which the uncured resin R is supplied.
  • the cavity 21 is formed in a concave shape having a volume that allows at least all of the semiconductor elements C mounted on the mounting surface W1 of the workpiece W to enter and has a depth that allows the mounting to the mounting surface W1 of the workpiece W.
  • At least the second mold 2 is provided with a heater (not shown) for heating the cavity 21 and its periphery. A heater for heating can also be provided in the first mold 1.
  • the second mold 2 is a lower mold disposed on the resin side of the molding.
  • a circular concave cavity 21 into which the uncured resin R, all the semiconductor elements C, and the connection member C1 enter is integrally formed at the central portion of the inner surface of the lower mold.
  • a circular concave portion into which the entire work W is inserted is formed integrally with the cavity 21.
  • the shape of the cavity 21 is changed to a rectangular concave shape corresponding to the outer shape of the workpiece W, or only the cavity 21 is formed without forming the concave portion into which the entire workpiece W enters. It is possible to change what to do.
  • Uncured resin R is supplied into the cavity 21.
  • the structure of the cavity 21 is such that the mounting surface W1 of the workpiece W and the semiconductor element C are immersed in the uncured resin R in the cavity 21 so that the uncured resin R overflows from the cavity 21 and will be described later. It is comprised so that it may flow into the overflow channel 71. That is, the uncured resin R in the cavity 21 overflows from the cavity 21 and flows out to the overflow channel 71 by the volume of the mounting surface W1 and the semiconductor element C immersed therein.
  • the supply amount of the thermosetting resin R ⁇ b> 1 to the cavity 21 is set to be larger than the mounting surface W ⁇ b> 1 of the workpiece W and the immersion capacity of the semiconductor element C with respect to the uncured resin R in the cavity 21.
  • the volume of the cavity 21 is set to about 101 to 120% with respect to the volume obtained by subtracting the mounting surface W1 of the workpiece W and the immersion volume of the semiconductor element C. Is preferred. This prevents the occurrence of molding defects due to insufficient supply of the thermosetting resin R1 and the generation of bubbles in the resin-sealed molded product M, and overflow due to excessive supply of the thermosetting resin R1. It is possible to prevent overflow from the road 71 at the same time.
  • a sheet-like thermosetting resin R 1 having an outer shape corresponding to the shape and size of the cavity 21 is supplied into the cavity 21. It is melted with a heater for heating.
  • a powdered or granular thermosetting resin R2 is supplied into the cavity 21 and melted with a heater for heating, or FIG.
  • the fiber-containing resin substrate R3 in which the uncured resin layer R31 is impregnated in the resin-impregnated fiber base R32 is supplied into the cavity 21 as shown in FIG.
  • the powdered or granular thermosetting resin R ⁇ b> 2 easily adjusts the capacity of the uncured resin R more easily than the sheet-like thermosetting resin R ⁇ b> 1 or the fiber-containing resin substrate R ⁇ b> 3.
  • the fiber-containing resin substrate R3 shown in FIG. 7 is a resin-impregnated fiber base made of carbon fiber, glass fiber, quartz glass fiber or the like whose linear expansion coefficient in the XY direction is smaller than 3 ppm, as described in Japanese Patent No. 5934078.
  • a material R32 and an uncured resin layer R31 made of an uncured epoxy resin or the like formed on one surface of the resin-impregnated fiber substrate R32 are provided.
  • the shrinkage stress when the uncured resin layer R31 is cured can be suppressed.
  • the workpiece W (wafer or substrate) warps, the workpiece W (wafer)
  • the separation of the semiconductor element C from the substrate and the substrate and the damage of the workpiece W (wafer or substrate) can be suppressed, and the mounting surface W1 of the workpiece W (wafer or substrate) on which the semiconductor element C is mounted or the semiconductor element C is formed.
  • the mounting surface W1 of the workpiece W (wafer or substrate) can be collectively sealed at the level of the workpiece W (wafer or substrate) and the sealing performance such as heat resistance and moisture resistance is excellent after sealing.
  • the second mold 2 is preferably divided into a central portion 22 constituting the bottom surface portion of the cavity 21 and an outer portion 23 serving as a side surface portion of the cavity 21. It is preferable to form a suction slit 61 between the central portion 22 and the outer portion 23 as the positioning portion 6 of the release sheet S (first release sheet S1).
  • the suction slit 61 communicates with an air suction device 62 such as a vacuum pump so that the release sheet S (first release sheet S1) having excellent stretchability is bent along the shape of the bottom surface and the side surface of the cavity 21. Position and hold so as to deform.
  • the outer portion 23 includes a driven portion 23a that is in contact with the first mold 1 regardless of the presence or absence of the release sheet S (first release sheet S1, second release sheet S2), and the first mold 1 and the driven portion 23a.
  • a stopper 23b that restricts the movement of the follower in the Z direction and an elastic member 23c that constantly biases the driven portion 23a toward the first mold 1 are provided.
  • the driven portion 23a is supported so as to be capable of reciprocating in the Z direction, and the bottom surface of the cavity 21 from the pressing portion 11 of the first mold 1 with the first mold 1 in contact with the stopper 23b via the driven portion 23a.
  • the distance to the part is set to be the same as the thickness of the molded product M including the workpiece W.
  • the second mold 2 is integrally formed without being divided into the central portion 22 and the outer portion 23, and the shape and structure of the outer portion 23 are changed to shapes and structures other than those shown in the drawing. It is also possible to change it.
  • the pressurizing mechanism 7 for the uncured resin R includes an overflow channel 71 that is continuously formed outside the cavity 21, a plunger 72 that is provided so as to protrude toward the overflow channel 71, and an unfilled channel in the overflow channel 71. And a deformable separation portion 73 provided between the cured resin R and the plunger 72.
  • the overflow channel 71 is preferably formed with a plurality of overflow channels 71 around the cavity 21 at predetermined intervals.
  • a plurality of plungers 72 are respectively provided in the plurality of overflow channels 71, and the plurality of overflow channels 71 and the plurality of plungers 72 are preferably arranged symmetrically with respect to the shape of the cavity 21.
  • a plurality of overflow channels 71 are respectively arranged at predetermined intervals in the circumferential direction on the outer periphery of the circular concave cavity 21.
  • a plurality of plungers 72 are arranged at predetermined intervals in the circumferential direction at the top end of the bottom surface of each overflow channel 71 in a radial manner in the XY direction.
  • the first covered portion 11 f facing the cavity 21 in the Z direction corresponds to the same circular portion as the cavity 21, and the second portion facing the overflow channel 71 in the Z direction.
  • the covered portion 11s and the third covered portion 11t facing the plunger 72 in the Z direction correspond to an annular (annular) portion along the outer edge of the circular first covered portion 11f.
  • all of the first lid portion 11f, the second lid portion 11s, and the third lid portion 11t are continuously formed in a smooth shape.
  • the shape of the cavity 21 can be changed to a rectangular concave shape or a polygonal concave shape, or the size of the cavity 21 can be changed to a size other than the illustrated example.
  • a plurality of overflow channels 71 are arranged at predetermined intervals on each side or each corner of the cavity 21. It is possible to change not only the arrangement, number and shape of the plunger 72 but also the arrangement, number and shape of the plunger 72 other than the illustrated example.
  • the plunger 72 is supported so as to reciprocate in the Z direction with respect to the driven portion 23 a of the outer portion 23 and the like in order to vary the volume of the overflow channel 71.
  • the pressure applied to the uncured resin R by the plunger 72 may be set such that the pressure per unit area of pressing back from the plunger 72 is about 200 to 400% with respect to the pressure per unit area of the press at the time of clamping. preferable. Thereby, generation
  • the flow of the uncured resin R pushed back from the overflow channel 71 toward the cavity 21 causes an adverse effect such as deformation of the connecting member C1 such as a wire connecting the substrate terminal of the workpiece W and the semiconductor element C. Prevention can also be achieved. Examples of adverse effects caused by deformation of the connection member C1 include positional displacement of the semiconductor element C with respect to the substrate of the workpiece W, disconnection of the connection member C1, damage to the semiconductor element C, and the like.
  • torque of a servo motor or the like serving as the drive source 72a of the plunger 72 is detected, and when the uncured resin R is pushed back from the overflow channel 71 toward the cavity 21 by the plunger 72.
  • the separation portion 73 is preferably formed integrally with the outer peripheral portion of the release sheet S (first release sheet S1) supplied along the cavity 21.
  • the first release sheet S ⁇ b> 1 is preferably disposed across the cavity 21 and the overflow channel 71, and the part of the first release sheet S ⁇ b> 1 along the overflow channel 71 and the covering portion of the plunger 72 is preferably the separation part 73.
  • the sealed chamber 31 is preferably formed inside the vacuum device 3 including a vacuum chamber and the like, and it is preferable that gas is exhausted (evacuated and evacuated) from the sealed chamber 31 by the operation of the pressure adjusting unit 5 such as a vacuum pump.
  • the sealed chamber 31 is configured to be capable of adjusting the transformation from the atmospheric atmosphere AP to the reduced-pressure atmosphere DP having a predetermined degree of vacuum.
  • the vacuum device 3 is configured to be openable and closable in whole or in part so that the workpiece W, the uncured resin R, the release sheet S, the molded product M, and the like can be taken in and out of the sealed chamber 31.
  • Automation can be achieved by providing a transfer mechanism (not shown) such as a transfer robot across the sealed chamber 31 in the vacuum apparatus 3 and the external space O of the vacuum apparatus 3. More specifically, when the sealed chamber 31 is the atmospheric atmosphere AP, the workpiece W, the uncured resin R, and the release sheet S are carried into the sealed chamber 31 by the transport mechanism. Molding is performed after the sealed chamber 31 is in a reduced pressure atmosphere DP having a predetermined degree of vacuum. After the molding is completed, the molded product M is returned from the sealed chamber 31 to the external space O by returning to the atmospheric atmosphere AP.
  • a transfer mechanism such as a transfer robot across the sealed chamber 31 in the vacuum apparatus 3 and the external space O of the vacuum apparatus 3. More specifically, when the sealed chamber 31 is the atmospheric atmosphere AP, the workpiece W, the uncured resin R, and the release sheet S are carried into the sealed chamber 31 by the transport mechanism. Molding is performed after the sealed chamber 31 is in a reduced pressure atmosphere DP having a predetermined degree of vacuum. After the molding is completed, the molded product
  • the peripheral wall portion 32 constitutes the lower side of the vacuum device 3 on the outer periphery of the first mold 1 constituting the upper side of the vacuum device 3. It is provided so as to be detachable and intimately attached to the outer periphery of the second mold 2.
  • the peripheral wall portion 32 has a seal portion 32a that is in close contact with the outer peripheral portion of the second mold 2 in the Z direction, and a stretchable portion 32b that is elastically deformable in the Z direction.
  • a peripheral wall portion may be provided on the outer periphery of the second mold 2, or the first mold 1 and the second mold 2. A change such as providing a peripheral wall portion separable in the Z direction on the outer periphery is possible.
  • the drive unit 4 for raising and lowering is configured by an actuator or the like that reciprocates either the first mold 1 or the second mold 2 or both the first mold 1 and the second mold 2 in the Z direction.
  • the operation is controlled by the control unit 8 described later.
  • control of the drive unit 4 for raising and lowering by the control unit 8 at the time of carrying in the workpiece W and the uncured resin R shown by the solid line in FIG. 1 and at least carrying out the molded product M shown in FIG. Sometimes, the first mold 1 and the second mold 2 are relatively moved apart in the Z direction.
  • the first molding die 1 and the second molding die 2 move further closer to pressurize the workpiece W and the uncured resin R.
  • either the first molding die 1 or the second molding die 2 is relatively moved away from the other in the Z direction by the elevating drive unit 4 at the time of carry-in or carry-out, or the first Both the mold 1 and the second mold 2 are moved relatively apart from each other in the Z direction.
  • either the first mold 1 or the second mold 2 is moved relatively close to the Z direction toward the other, or both the first mold 1 and the second mold 2 are moved to each other. Move relatively close to the Z direction. In the case of the example shown in FIG.
  • the lifting drive unit 4 only the first mold 1 is linked to the lifting drive unit 4, and the first mold 1 side is second molded. It is moved close to the mold 2 side in the Z direction.
  • the second mold 2 is linked to the drive unit 4 for raising and lowering, and the second mold 2 side is relatively close to the first mold 1 side in the Z direction.
  • the first molding die 1 and the second molding die 2 are respectively linked to the raising / lowering drive unit 4 to move the first molding die 1 side and the second molding die 2 side simultaneously in the Z direction. It is possible to change things.
  • the control unit 8 includes not only the drive unit 4 for raising and lowering but also the pressure adjusting unit 5, the intake device 62 of the positioning unit 6, the drive source 72 a of the plunger 72 of the pressurizing mechanism 7, the workpiece W, the uncured resin R, and the mold release. It is a controller that is electrically connected to the transport mechanism of the sheet S and the like. The controller serving as the controller 8 sequentially controls the operation at a preset timing in accordance with a preset program in its control circuit (not shown).
  • FIG. 1 In the resin sealing method according to the embodiment of the present invention, the work W, the uncured resin R, and the release sheet S are carried into the opened sealed chamber 31, the mounting surface W 1 of the work W, and the semiconductor element C.
  • the main process includes a curing process in which resin sealing is performed and an unloading process in which the sealed chamber 31 is opened and the molded product M is taken out.
  • a depressurizing process for depressurizing the sealed chamber 31 from the atmospheric atmosphere AP to the depressurized atmosphere DP having a predetermined degree of vacuum.
  • the first mold 1 and the second mold 2 are relatively moved apart in the Z direction and directed toward the cavity 21 of the second mold 2 in the atmospheric atmosphere AP.
  • the release sheet S (first release sheet S1) and the uncured resin R are supplied by the transport mechanism. Thereby, the uncured resin R is set at a predetermined position of the cavity 21 via the first release sheet S1.
  • the work W and the release sheet S (second release sheet S21) are supplied by the transport mechanism and set at a predetermined position above the uncured resin R.
  • the decompression step as shown in FIG.
  • either one or both of the first mold 1 and the second mold 2 are moved relatively close to each other in the Z direction by the drive unit 4 for raising and lowering.
  • a sealed chamber 31 is formed between the first mold 1 and the second mold 2.
  • the pressure adjusting unit 5 discharges the gas in the sealed chamber 31 to the external space O (evacuation and evacuation) to reduce the pressure from the atmospheric atmosphere AP.
  • the uncured resin R in the cavity 21 is melted by a heater for heating. After that, as shown in FIG.
  • the plunger 72 projects and moves into the overflow channel 71 toward the third covered portion 11 t of the first mold 1. At this time, the plunger 72 projects and moves toward the overflow channel 71 through the covering portion of the plunger 72 that becomes the separation portion 73 in the release sheet S (first release sheet S1). As a result, the uncured resin R of a volume that protrudes the separating portion 73 into the overflow channel 71 is pushed back to the overflow channel 71 without flowing into the plunger 72, and the uncured resin in the cavity 21. R is pressurized and the uncured resin R is further compressed.
  • the operation of the plunger 72 is controlled in the initial state before the uncured resin R overflows the overflow channel 71 (before the dipping step shown in FIG. 3B). It moves in the opposite direction to the projecting movement direction toward 71 and stands by.
  • the plunger 72 protrudes toward the overflow channel 71 to stand by, and the plunger 72 is reversed by its weight as the uncured resin R overflows into the overflow channel 71. It is also possible to control the operation so as to move the direction.
  • the uncured resin R in the cavity 21 and the overflow channel 71 is cured together by heating with a heater or the passage of time, and the work surface W1 and the semiconductor element C are placed between the two.
  • the gap C2 excluding the connection member C1 is integrally resin-sealed.
  • the pressure adjusting unit 5 supplies air from the external space O to the sealed chamber 31 and returns it to the air atmosphere AP.
  • the plunger 72 moves backward to return to the initial state.
  • the first mold 1 and the second mold 2 are moved apart by the drive unit 4 for raising and lowering, and the non-mounting surface W2 of the workpiece W is peeled from the pressing part 11 of the first mold 1. .
  • the subsequent unloading process as shown in FIG.
  • the resin sealing is completed.
  • the molded product M and the release sheet S are carried out from the sealed chamber 31 to the external space O by the transport mechanism.
  • the molded product M and the release sheet S (first release sheet S1, second release sheet S2) are separated in the sealed chamber 31 or in the external space O.
  • a holding chuck is provided as a pressing portion 11 on the surface of the first mold 1, and a workpiece is placed at a predetermined position on the surface of the first mold 1 by this holding chuck.
  • a non-mounting surface W2 of W is detachably held (suspended).
  • the work W carried in by a transport mechanism such as a transport robot is received by the holding chuck, and the work W is dropped along the surface of the first mold 1. It is suspended impossible. Thereby, the pressing part 11 is made to contact the non-mounting surface W2 of the workpiece
  • An adhesive chuck 12 is preferably used as the holding chuck provided in the pressing portion 11.
  • the workpiece W is directly adhered and held by the adhesive chuck 12 without sandwiching the release sheet S (second release sheet S2) between the pressing portion 11 and the non-mounting surface W2 of the workpiece W.
  • the entire or part of the adhesive chuck 12 is made of, for example, an adhesive material such as fluorine rubber, elastomer, butyl rubber, photosensitive resin, acrylic or silicon, and is opposed to the non-mounting surface W2 of the workpiece W in the Z direction. It has a surface 12a. In the case of the example shown in FIG.
  • a plurality of adhesive surfaces 12 a formed in a sheet shape are respectively distributed and arranged on the pressing portions 11 of the first mold 1.
  • the adhesive surface 12a is protruded from the pressing portion 11 of the first mold 1 toward the sealed chamber 31 described later so as to be elastically deformable.
  • the non-mounting surface W2 of the workpiece W is held (suspended) by the pressing portion 11 of the first mold 1, the mounting surface W1 of the workpiece W and the semiconductor element C in the decompression step (not shown)
  • the gas in the sealed chamber 31 is discharged to the external space O with a predetermined gap (gap) between the release sheet S (first release sheet S1) and the uncured resin R in the cavity 21. (Evacuation, evacuation) becomes possible. Thereby, the surface of the uncured resin R is sufficiently exposed to the vacuum in the sealed chamber 31, and the defoaming of the uncured resin R is promoted. For this reason, in the decompression step shown in FIG.
  • the placement surface W1 of the workpiece W, the semiconductor element C, the release sheet S (second release sheet S2), and the cavity 21 The entire gap C2 excluding the mounting surface W1 of the workpiece W and the connecting member C1 of the semiconductor element C, compared to the inner release sheet S (first release sheet S1) and the one having a narrow gap with the uncured resin R. Therefore, it is possible to stably produce a mold which is excellent in the invasion property of the uncured resin R with respect to the surface and in which bubbles (voids) are not generated.
  • the non-mounting surface W ⁇ b> 2 of the workpiece W is moved toward the pressure-sensitive adhesive surface 12 a of the pressure-sensitive adhesive chuck 12 and forcedly brought into contact with the pressing portion 11 of the first mold 1. It is preferable to provide the abutting part 13 and a peeling part (not shown) for peeling the non-mounting surface W2 of the workpiece W from the adhesive surface 12a of the adhesive chuck 12.
  • the pressing force of the workpiece W by the abutting portion 13 is obtained by crushing the adhesive surface 12a of the adhesive chuck 12 slightly protruding from the pressing portion 11 of the first molding die 1 with the non-mounting surface W2 of the workpiece W, thereby performing the first molding.
  • the suction hole 13 a is opened in the pressing portion 11 of the first mold 1, and the size of the suction hole 13 a is approximately the size of the concave groove portion 11 a.
  • the same setting is used for multiple distributed arrangements.
  • Each suction hole 13a communicates with an actuator (not shown) such as a compressor for vacuum suction or gas injection.
  • the non-mounting surface W2 of the workpiece W is drawn toward the adhesive chuck 12, and the non-mounting surface W2 is pressed against the adhesive surface 12a.
  • a push pin provided so as to be reciprocally movable in the Z direction with respect to the first mold 1 is used, and the tip of the push pin pushes the non-mounting surface W2 of the workpiece W from the adhesive surface 12a. Peeling is preferable.
  • the non-mounting surface W2 of the workpiece W can be pushed off from the adhesive surface 12a by injecting compressed gas from the suction hole 13a.
  • an electrostatic chuck is used in place of the suction hole 13a as the abutting portion 13 of the work W, and the non-mounting surface W2 of the work W is adhered to the adhesive chuck by electromagnetic attraction by the electrostatic chuck.
  • it is possible to make a change such as pulling it toward the surface 12 and pressing it, or pressing and peeling the non-mounting surface W2 of the workpiece W from the adhesive surface 12a with an electric repulsive force.
  • a push pin as the peeling portion and a jet of compressed gas from the suction hole 13a in combination.
  • the sheet-like thermosetting resin R1 as the uncured resin R may be replaced with the powdery or granular thermosetting resin R2 shown in FIG. 6, or the uncured resin layer R31 shown in FIG. Can be changed such as replacing the fiber-containing resin substrate R3 impregnated with the resin-impregnated fiber base R32.
  • the uncured resin R is supplied inside the cavity 21 with the plate-like spacer P interposed therebetween, and is clamped in the same manner as in the first embodiment described above.
  • the configuration for manufacturing the molded product M that is molded is different from the first embodiment and the second embodiment described above, and other configurations are the same as those in the first embodiment and the second embodiment.
  • a plurality of types of spacers P having different thicknesses are prepared, and a spacer P having a thickness suitable for the thickness of the molded product M is used. Therefore, in the third embodiment, in the initial state shown in FIG.
  • the spacer P is set inside the cavity 21, and the release sheet S (first release sheet S ⁇ b> 1) is sandwiched between the uncured resin. R is supplied. Thereafter, the operation of the third embodiment is controlled in the same manner as in FIGS. 3 (a), 3 (b) to 5 (a), (b) of the first embodiment.
  • the pressing portion 11 of the first mold 1 as in the first embodiment shown in FIG. 1 is initially in contact with the non-mounting surface W2 of the workpiece W. In the state, one spacer P is set inside the cavity 21.
  • thermosetting resin R1 as the uncured resin R may be replaced with the powdery or granular thermosetting resin R2 shown in FIG. 6, or the uncured resin layer R31 shown in FIG. Can be changed such as replacing the fiber-containing resin substrate R3 impregnated with the resin-impregnated fiber base R32.
  • the second mold 2 has the molded product M to be resin-sealed.
  • Actuators such as a cavity 21 that has an outer shape and a plunger 72 that pushes back the uncured resin R that has flowed out of the cavity 21 into the overflow channel 71 to the cavity 21 are collectively arranged.
  • the first mold 1 includes a first covered portion 11 f that faces the cavity 21, a second covered portion 11 s that faces the overflow channel 71, and a third covered portion 11 t that faces the plunger 72. It is continuously formed without mutual boundaries.
  • the second type of mold M can be changed when the product type is changed.
  • the first mold 1 can be shared only by exchanging the mold 2. Therefore, it is possible to deal with various types of molded products M by changing the second mold 2 alone. As a result, it is not necessary to replace the first mold 1 when changing the type of the molded product M, compared to the conventional type in which the lower mold is provided with a cavity and the upper mold is provided with a plunger. This is not only easy, but also shortens the downtime and improves the operating rate.
  • the working time can be significantly shortened by replacing only the second mold 2 so that the operating rate can be significantly improved.
  • the structure of the first mold 1 serving as the upper mold can be simplified and the weight can be reduced. Since the drive unit 4 of the mold 1 can also be reduced in size, not only can the entire apparatus be made compact, but it is not necessary to remove the upper mold after removing the lower mold from the apparatus. Cost can be reduced.
  • the plunger 72 is covered with the release sheet S: the first release sheet S1) between the cavity 21 and the uncured resin R and between the uncured resin R and the plunger 72 in the overflow channel 71. It is preferable to provide it. In this case, after the uncured resin R overflows the overflow channel 71 as the mounting surface W1 of the workpiece W and the semiconductor element C are immersed in the uncured resin R in the cavity 21, the release sheet S is discharged. In (first release sheet S ⁇ b> 1), the covered portion of the plunger 72 projects and moves into the overflow channel 71 by the operation of the plunger 72.
  • the release sheet S (first release sheet S1)
  • the uncured resin R in the cavity 21 is pressurized by being pushed back to the path 71, and the uncured resin R is compressed. Therefore, the covering member of the plunger 72 can be integrated with the release sheet S (first release sheet S1) that prevents the cavity 21 and the uncured resin R from adhering.
  • the release sheet S (between the uncured resin R in the overflow passage 71 and the plunger 72 is compared with the conventional one in which the uncured resin enters the plunger moving gap by pressurization of the plunger and solidifies. Since a part of the first release sheet S1) is sandwiched, the molded product M can be easily taken out. Thereby, the tact time for peeling the molded product M can be shortened, and the productivity is excellent.
  • a plurality of overflow channels 71 are formed around the cavity 21 at predetermined intervals, and a plurality of plungers 72 are provided in the plurality of overflow channels 71.
  • the plurality of overflow channels 71 and the plurality of plungers 72 are preferably arranged equally, such as symmetrically arranged with respect to the shape of the cavity 21. In this case, as the mounting surface W1 of the workpiece W and the semiconductor element C are immersed in the uncured resin R in the cavity 21, the uncured resin R flows evenly into the plurality of overflow channels 71 and overflows. .
  • the uncured resin R is an outer sheet-shaped resin R1 corresponding to the shape and size of the cavity 21, and the second mold 2 has a heater for heating the sheet-shaped resin R1.
  • the sheet-shaped resin R1 approaches the overflow channel 71 with a uniform thickness over the entire surface of the cavity 21. Even if the sheet-like resin R1 is melted by the heater for heating, it hardly flows in the cavity 21. Therefore, a set amount of the uncured resin R can be supplied over the entire surface of the cavity 21 with a simple structure.
  • the melted uncured resin in the cavity compared to the conventional resin in which the resin flows in a wide range toward the entirety of the cavity by melting the powder resin that is concentrated and supplied to a part of the cavity.
  • the flow of R becomes slight, and the resin internal spots (flow spots) due to non-uniform flow friction of the molten uncured resin R can be suppressed.
  • the molten uncured resin R smoothly flows from the cavity 21 to the overflow channel 71 without a time lag with respect to the mounting surface W1 of the workpiece W and the semiconductor element C, and the uncured resin R by the subsequent mold clamping Even when pressure is applied or when the uncured resin R is pushed back into the cavity 21 from the overflow channel 71 by the plunger 72, connection of a wire or the like connecting the substrate terminal of the workpiece W and the semiconductor element C by the flow of the uncured resin R Generation of adverse effects such as deformation of the member C1 can be prevented.
  • connection member C1 Examples of adverse effects caused by deformation of the connection member C1 include positional displacement of the semiconductor element C with respect to the substrate of the workpiece W, disconnection of the connection member C1, damage to the semiconductor element C, and the like. As a result, a high-quality molded product M having a more stable shape and quality can be produced.
  • the overall structure of the device can be simplified and the work piece can be simplified at least as much as the weighing unit is not required. It is also possible to share the loading of W and the supply of the sheet-like resin R1, and the maintenance can be simplified.
  • the first mold 1 is an upper mold disposed on the mold substrate side
  • the second mold 2 is the resin side of the mold.
  • the present invention is not limited to this, and the first mold 1 is a lower mold disposed on the resin side of molding, and the second mold 2 is disposed on the substrate side of molding. It may be an upper mold.
  • a Resin sealing device 1 1st shaping

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Afin de s'adapter à divers changements de type d'article moulé par simple échange d'une seconde matrice de moulage, la présente invention est équipée : d'une première matrice de moulage ayant une section de pression pour une pièce à travailler ayant un élément semiconducteur monté sur celle-ci; une seconde matrice de moulage ayant une cavité à laquelle une résine non durcie est fournie et disposée de façon à faire face à la surface de montage de pièce à travailler sur laquelle est monté l'élément semiconducteur; une chambre d'étanchéité pouvant être ouverte/fermée formée entre la première matrice de moulage et la seconde matrice de moulage; une unité d'entraînement pour déplacer la première matrice de moulage et/ou la seconde matrice de moulage d'une manière telle que les première et seconde matrices de moulage se rapprochent l'une de l'autre dans la direction dans laquelle les matrices se font face; un mécanisme de mise sous pression ayant un piston pour appliquer une pression à la résine non durcie à l'intérieur de la cavité dans la chambre d'étanchéité ; et une unité de commande pour commander le fonctionnement de l'unité d'entraînement et du piston. Dans celui-ci, le mécanisme de mise sous pression comporte un canal de trop-plein de résine non durci disposé dans la seconde matrice de moulage à l'intérieur de la chambre d'étanchéité de façon à être continu avec la cavité, et un piston disposé dans la seconde matrice de moulage de façon à pouvoir se déplacer et 0 se projeter vers le canal de trop-plein. La première matrice de moulage a une première section de recouvrement disposée de façon à faire face à la cavité, une seconde section de recouvrement disposée de façon à faire face au canal de trop-plein, et une troisième section de recouvrement disposée de façon à faire face au piston. La première section de recouvrement, la seconde section de recouvrement et la troisième section de recouvrement sont formées en continu les unes avec les autres. L'unité de commande commande l'unité d'entraînement de manière à immerger la surface de montage de pièce à travailler et l'élément semiconducteur dans la résine non durcie à l'intérieur de la cavité, en déplaçant les première et seconde matrices de moulage de façon à se rapprocher l'une de l'autre, et dans un état dans lequel la résine non durcie à l'intérieur de la cavité s'est écoulée dans le canal de trop-plein en réponse à l'immersion, amène le piston à se déplacer et à faire saillie dans le canal de trop-plein vers la troisième section de recouvrement.
PCT/JP2018/002656 2017-01-30 2018-01-29 Dispositif d'étanchéité en résine et procédé d'étanchéité en résine WO2018139631A1 (fr)

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JP7345322B2 (ja) * 2019-09-03 2023-09-15 株式会社ディスコ 樹脂の被覆方法及び樹脂被覆装置
CN114571664B (zh) * 2022-02-28 2024-01-16 广东风华芯电科技股份有限公司 一种用于半导体芯片封装的去溢料装置及其方法

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JP2009248481A (ja) * 2008-04-08 2009-10-29 Sumitomo Heavy Ind Ltd 圧縮成形方法
JP2010034447A (ja) * 2008-07-31 2010-02-12 Renesas Technology Corp 半導体装置の製造方法

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JP3667249B2 (ja) * 2001-04-24 2005-07-06 アピックヤマダ株式会社 樹脂封止装置
WO2006100765A1 (fr) * 2005-03-23 2006-09-28 Renesas Technology Corp. Procede de fabrication d’un dispositif semi-conducteur et dispositif de moulage par compression
JP6271193B2 (ja) * 2013-09-11 2018-01-31 東芝メモリ株式会社 半導体装置の製造方法、半導体製造装置、および樹脂封止用シート状樹脂

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US20080206930A1 (en) * 2007-02-23 2008-08-28 Micron Technology, Inc. Systems and methods for compressing an encapsulant adjacent a semiconductor workpiece
JP2009248481A (ja) * 2008-04-08 2009-10-29 Sumitomo Heavy Ind Ltd 圧縮成形方法
JP2010034447A (ja) * 2008-07-31 2010-02-12 Renesas Technology Corp 半導体装置の製造方法

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