WO1998011009A1

WO1998011009A1 - Reading device for transmission type film

Info

Publication number: WO1998011009A1
Application number: PCT/JP1997/003197
Authority: WO
Inventors: Haruo Kotani; Tadashi Iwasa; Makoto Okazaki
Original assignee: Nishimoto Sangyo Co., Ltd.
Priority date: 1996-09-12
Filing date: 1997-09-10
Publication date: 1998-03-19
Also published as: EP0873958A4; EP0873958A1

Abstract

A reading device (R) for transmission type film which comprises film holding means having an arcuate surface (11) which approximates a free flexure curve of a film (F), a drive roller (23) arranged below the arcuate surface (11), a driven roller (24) corresponding to the drive roller (23) to be arranged above the arcuate surface (11), and film conveying means constructed such that a driving member for the drive roller (23) can contact with the rear surface of the film (F) and a driven member of the driven roller (24) can contact with the front surface of the film (F).

Description

Specification

Technical field of transmissive film reader

The present invention relates to an oversized film reader. More specifically, the present invention relates to a transmissive film reading apparatus having a simplified laser optical system. Background art

Conventionally, in a transmission type medical film reader (hereinafter simply referred to as a reader), as shown in FIG. 18, after being irradiated from a semiconductor laser device a, a focusing lens b The laser beam c condensed by the laser is reflected by a polygon mirror d to scan (main scan) the film f surface held in a flat shape. In this case, an FΘ lens g is interposed between the polygon mirror d and the film f to correct the optical path length, and a cylinder lens is placed after the Fe lens g to correct surface tilt. H is interposed. The film f on which the main scanning is performed is formed by a pair of cylindrical driving rollers i, i and a pair of cylindrical driven rollers j, j as shown in FIG. f is conveyed downward, for example, while the deflection of f in the main scanning direction is suppressed. That is, sub-scanning of the film ί is performed. In addition, as shown in FIG. 20, there is a type in which the driving is performed by using a combination of a driving roller i and a driven roller j. In FIG. 20, a symbol k indicates a scanning unit equipped with an optical system such as a polygon mirror d. By the way, in such a configuration, the sub-scanning mechanism of the film can be simplified by using the cylindrical apertures i and j, while the optical characteristics of the film can be controlled by the F0 lens g. There is also a problem that the cost of the reading device is increased due to the high cost of the F F lens g.

In order to solve the problem of the reader configured using the F-lens g, as shown in FIG. 21, an arc having the film f plane oriented in the main scanning direction is used. There has been proposed a reading device having a surface and a film transport mechanism in which a sub-scan is performed by combining a beading roller m and a continuous roller n. However, when the film f is transported by such a transport mechanism, the deflection of the film f in the main scanning direction is suppressed, but the peripheral velocities of the central part and the peripheral part of the rollers 1 m and n are different. Another problem is that sub-scanning cannot be performed smoothly.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the related art, and provides a transmissive film gun pick-up device capable of reading a film with high accuracy without using an F © lens g. It is intended for this purpose. Disclosure of the invention

A first embodiment of the present invention relates to a transmission type film reading apparatus, wherein film transport means for transporting the film along an arc surface approximated to a free deflection curve of the film is provided. It is characterized by being provided.

Specifically, a first mode of the present invention is a film holding means having an arc surface approximated to a free radius curve of a film; a driving roller disposed below the arc surface; A driven roller disposed above the arc surface in correspondence with the driving port, and a driving member of the driving roller can be brought into contact with a film rear surface; A transmissive film reading apparatus characterized by comprising a film transport means in which a driven member can be brought into contact with the film surface. In the first embodiment of the present invention, it is preferable that two sets of a drive port and a driven port are used, and that each set is opposed to each other across the main scanning surface.

Further, in the first embodiment of the present invention, the driving member of the driving roller is a pair of driving wheels mounted on a driving shaft at predetermined intervals, and the driven member of the driven roller is a shaft member. It is preferable that a pair of driven wheels are mounted so as to correspond to the driving wheels.

In the first embodiment of the present invention, the drive wheels and the driven wheels It is preferable that the contact surface with the film is an arc surface.

Further, in the first embodiment of the present invention, it is preferable that the driven roller can be moved up and down.

Further, in the first embodiment of the present invention, a box-shaped body in which a ceiling member and a bottom member are parallel to each other and which has a longitudinal direction in a scanning direction of laser light and is configured by combining flat plate-shaped members, A back surface of the shell-shaped member, which comprises a pair of light detecting means disposed at appropriate positions on a plane parallel to the scanning surface of the light, and on which the film of the box-shaped main body is placed and conveyed; A ceiling member abutting on the ceiling member is formed along the back surface of the shell-shaped member, and a slit along the scanning direction of the laser beam for allowing the laser beam to enter the main body into the ceiling member. It is preferable to have a light concentrating device for a film concentration detector in which a film is formed.

Here, the slit is coated, for example, with a scattering film that appropriately scatters light, and the inner surface of the box-shaped main body is, for example, a coating that prevents absorption of laser light that has entered the main body. Or has been formed.

Further, in the first embodiment of the present invention, it is preferable to provide a film width aligning means.

Here, the width aligning means is formed by, for example, opposingly disposing a width aligning member that is movable back and forth in the width direction of the film.

A second embodiment of the present invention relates to a film transport device s used in a transmission type film reading apparatus, which transports a film by placing the film on an arc surface approximating a free deflection curve of the film. It is characterized by doing.

Specifically, the second mode of the present invention is a film holding means having an arc surface approximated to a free bending curve of a film; a driving roller disposed below the arc surface; And a driven roller disposed above the arc surface corresponding to the roller, wherein a driving member of the driving roller can be brought into contact with a film rear surface, and a driven member of the driven roller is It is characterized in that it can be brought into contact with the film surface. In a second embodiment of the present invention, a combination of a driving roller and a driven roller CT 7/031

Four

It is preferable to use two sets of alignments, each set facing each other across the main scanning plane.

Further, in the second embodiment of the present invention, the driving member of the driving roller is a pair of driving wheels mounted on a driving shaft at a predetermined interval, and the driven member of the driven roller is a shaft member. It is preferable that a pair of driven wheels are mounted so as to correspond to the driving wheels.

Further, in the second embodiment of the present invention, it is preferable that the contact surfaces of the drive wheels and the driven wheels with the finolem are arc-shaped surfaces.

Further, in the second embodiment of the present invention, it is preferable that the driven roller can be moved up and down.

According to a third mode of the present invention, a film is placed on the upper surface of a shell-like member formed in an arc and conveyed, the conveyed film surface is scanned with a laser beam, and the transmitted light is transmitted. What is claimed is: 1. A light-collecting device for a film density detector, which is used in a film-density detector for condensing light and detecting the intensity of the film, wherein the light-collecting device for a film-density detector is a flat plate. A box-shaped main body having a longitudinal direction in the scanning direction of the laser beam and having a longitudinal direction parallel to the ceiling member and the bottom member, and an appropriate position of a plane parallel to the laser light scanning surface of the main body. A ceiling member abutting against a back surface of a shell-shaped member on which a film of the box-shaped main body is placed and conveyed, Is formed along the backside of the ceiling, and the ceiling member is exposed to laser light. That you 沿U scan Li Tsu DOO in the scanning direction of the lasers light is formed in order to enter the body, characterized. In the third embodiment of the present invention, it is preferable that the slit is covered with a scattering film that appropriately scatters light.

Further, in the third embodiment of the present invention, it is preferable that the inner surface of the box-shaped main body is formed with a coating for preventing absorption of laser light that has entered the main body.

Since the first embodiment of the present invention is configured as described above, the transmission type film can be read without providing the F © lens in the scanning unit. Sampling can be performed with high accuracy.

Since the second embodiment of the present invention is configured as described above, the finolem follows the circular-arc surface only by placing the film on the circular-arc surface. Therefore, it is not necessary to press the film by the driving roller and the driven roller to make the film conform to the conveying surface, and the configuration of the driving roller and the driven roller is simplified.

Since the third embodiment of the present invention is configured as described above, the film conveyed in an arc shape can be brought into a substantially close contact state over the entire width, so that the scanning speed of the laser light can be reduced. It can be constant for the light-collecting device for the film concentration detector, and does not increase the size of the transmission film reading device on which it is mounted. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of a main part of a transmission type film reader according to the present invention. FIG. 2 is a lateral cross-sectional view of the reading device S.

FIG. 3 is a left side view showing a part of the reading device in a cross section.

FIG. 4 is a cross-sectional view of the right end portion of the reading device.

FIG. 5 is a schematic diagram of a film transport mechanism.

FIG. 6 is an explanatory diagram showing outer peripheral shapes of a drive wheel and a driven wheel.

Fig. 7 is an explanatory view of the arrangement method of the drive wheel and the driven wheel. Fig. 7 (a) shows the case where the extension of the center line of the drive wheel and the driven wheel passes through the center of curvature of the arc table. (B) shows a vertical case.

FIG. 8 is a schematic diagram of a link mechanism used in the reader. FIG. 9 is a perspective view of a light-collecting device for a film density detector used in the reader.

FIG. 10 is an exploded perspective view of the same.

FIG. 11 is a perspective view showing a state in which the light collector is separated from an arc table.

FIG. 12 is an exploded perspective view of the film width aligning mechanism. FIG. 13 is an operation explanatory view of the reading device of the present invention, showing an initial state of the reading device.

FIG. 14 is an explanatory diagram of the operation, showing a state where the film is inserted.

FIG. 15 is an explanatory diagram of the operation, and shows a state in which the upper guide is lowered. FIG. 16 is an explanatory diagram of the operation, and shows a state in which the film tip is pulled to a position S where the film tip deviates from the laser beam.

FIG. 17 is an explanatory view of the operation, showing a state in which the read film is being discharged.

FIG. 18 is an explanatory diagram of an optical system in a conventional reading device.

FIG. 19 is a schematic diagram of a film transport device in the reading device. FIG. 20 is a schematic view of another example of the conventional reading device.

FIG. 21 is a schematic diagram of still another example of the conventional reading device 11. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described based on embodiments with reference to the accompanying drawings, but the present invention is not limited to only such embodiments.

FIG. 1 is a perspective view showing a main part of a gun device (hereinafter simply referred to as a reading device S) R for a transmission type medical film according to an embodiment of the present invention, and a front sectional view of the reading device R. The left side view and the partial right side view are shown in Figure 2, Figure 3 and Figure 4, respectively. As shown in the figure, the reading device R includes a scanning unit U, an arc table 10 having an arc surface 11 which is an arc along the main scanning direction L of the film F, and The film transport mechanism 20 for sub-scanning the film F placed on the arc surface 11 and a light concentration device for a film density detector (hereinafter simply referred to as a light concentration device) 30 are main components. It is provided as a component.

The scanning unit U is the same as the conventional scanning unit, except that the F-lens is not provided. The arc table 10 is provided with an arc surface 11 that approximates a free deflection curve of the film F formed when the end of the film F orthogonal to the main scanning direction L is supported. For example, in a film F having a width of 14 inches, the radius of curvature of the arc surface 11 is set to about 300 mm. By setting the arcuate surface 11 in this way, the film F naturally fits into the arcuate surface 11 when the film F is placed on the arcuate table 10, so that the film F can be rolled with a roller. The optical path length from the polygon mirror (not shown) attached to the scanning unit U at each position along the main scanning direction L on the film F Can be equal.

As shown in FIG. 1, the film transport mechanism 20 includes a first drive section 21 and a second drive section 22 provided with the main scanning surface S interposed therebetween. As shown in FIG. 5, each of the unit 21 and the second driving unit 22 is configured by combining a driving roller 23 and a driven roller 24 having the same configuration. The drive port 23 includes a pair of plate-shaped drive wheels 23b, 23b mounted at predetermined intervals on a drive shaft 23a driven by a motor via a power transmission mechanism, for example. The driven roller 24 is a pair of plates mounted on a shaft 24a rotatably held by a vertically movable member by a suitable means so as to correspond to the drive wheels 23b, 23b. Driven wheels 24b, 24b. As shown in FIG. 6, the outer circumferences 23c and 24c of the drive wheel 23b and the driven wheel 24b are formed in an arc shape. Since the outer circumferences 23c and 24c of the drive wheel 23b and the driven wheel 24b are formed so as to be engaged with each other, the force of the drive wheel 23b and the driven wheel 24b, and the force of the film F when the film F is sandwiched. Unnecessary deformation is prevented.

Then, the driving roller 23 having such a configuration is connected to an arc table.

10, the outer periphery 23c of the drive wheel 23b is disposed so as to be able to contact the rear surface of the film F, and the driven port roller 24 is disposed above the circular arc table 10 so that the outer periphery 24c of the driven wheel 24b is It is arranged so that it can contact the surface of the film F. For this reason, the arc table 10 As shown in FIG. 1, a window 12 is provided for the drive wheel 23b to protrude from the surface of the circular arc surface 11. In this case, as shown in FIG. 7 (a), it is preferable to arrange the extension line of the center line of the driving wheel 23b and the driven wheel 24b so as to pass through the center of curvature 0 of the arcuate table 10. To prevent the mechanism from becoming complicated, the drive wheel 23b and the driven wheel 24b may be arranged vertically as shown in FIG. 7 (b). By adopting such a four-point follower, the meandering / sliding of the film F is prevented, and stable film transport is performed. As shown in FIGS. 2 and 3, the power transmission mechanism 25 for driving the drive port 23 is provided with a shaft-side transmission member 25a mounted on the ends of the drive shafts 23a, 23a, and a drive for the motor Ml. It comprises a motor-side transmission member 25b attached to the end of the shaft, and a belt 25c bridged between the shaft-side transmission members 25a, 25a and the motor-side transmission member 25b.

The vertically movable member holding the driven port roller 24 is specifically an upper guide 26 which is raised and lowered by a link mechanism. As shown in FIGS. 3 to 5, the upper guide 26 includes a first holding portion 26a holding the driven roller 24 of the first driving portion 21 and a driven roller 24 of the second driving portion 22. A second holding portion 26b holding the first holding portion 26a and the second holding portion 26b, a link 26d for raising and lowering the guide body 26c, and a rotation. The upper guide body 26c is pin-joined to the upper end of the link 26d or an appropriate position of the upper guide body 26c, and the lower end is pin-joined to the outer periphery of the rotating disc 26e. Specifically, the link 26d includes an upper link 26f and a lower link 26g, and the lower end of the up link 26f and the upper end of the down link 26g are rotatably joined ( See Figure 8). An elongated hole 26h is formed at the end of the upper link 26f, and a pin 26i implanted in the guide body 26c is slidably engaged with the elongated hole 26h. Also, an appropriate position S at the center of the upper link 26 mm is freely and pin-joined. On the other hand, the lower end of the downward link 26g is rotatably joined to the pin by the rotating disk 26e as described above. I have.

With the configuration in which the upper guide 26 is engaged, when the rotating disk 26e is rotated by the motor M2, the upper guide body 26c moves up and down, and the first holding portion 26a And the second holding part 26b also moves up and down. That is, the driven rollers 24 move up and down. The mechanism for raising and lowering the driven roller 124 is not limited to the above, but may be any suitable means. For example, the mechanism may be configured to be raised and lowered by a chain drive.

As shown in FIGS. 9 to 11, the light collector 30 includes a main body 40 and a photodetector 50 mounted at an appropriate position on the main body. As shown in FIGS. 10 and 11, the main body 40 has an upper surface 40a and a curvature corresponding to the curvature of the arc surface 11 so as to be mounted on the back surface 11a of the arc surface 11 along the width direction of the arc table 10. The cross section formed in an arc shape is a rectangular box (light collecting box) 40A. As shown in FIG. 2, the box body 40A includes, as shown in FIG. 2, a ceiling plate 41 formed into a curved surface corresponding to the curved surface of the arc surface 11 abutting on the back surface 1 la of the arc surface 11, a right side plate 42, A left side plate 43, a front plate 44 having an upper end formed in an arc along the inner surface of the ceiling plate 41, a rear plate 45 having an upper end formed in an arc along the inner surface of the ceiling plate 41, and a ceiling plate It is constructed by assembling 41 and the bottom 扳 46 molded into a concentric curved surface. Here, the front-back direction is based on the transport direction of the film F (see the arrow in FIG. 11).

The assembling of these plates 41.42, 43, 44, 45, 46 can be performed, for example, by assembling a ceiling plate 41 outwardly to the upper ends of the right side plate 42 and the left side plate 43 as shown in FIG. 43a is integrally formed in an appropriate size, and mounting plates 41a, 41a formed outward from both ends of the ceiling plate 41 are screwed to the mounting plates 42a, 43a correspondingly. At the front ends of the right side plate 42 and the left side plate 43, assembling plates 42b and 43b for assembling the front end 44 outward are integrally formed in an appropriate size and integrally. of Screw both ends with the upper end abutting on the inner surface of the ceiling plate 41, and assemble the mounting plates 42c and 43c for attaching the rear plate 45 outward to the rear ends of the right and left side plates 42 and 43. Then, both ends of the rear plate 45 are screwed to the assembly plates 42c and 43c with the upper end abutting on the inner surface of the ceiling plate 41, and are attached to the bottom of the right side plate 42 and the left side plate 43. Lock holes 42d, 43d are formed, and lock protrusions 46a, 46a formed corresponding to the lock holes 42d, 43d are locked to the ends of the bottom holes 46 in the lock holes 42d, 43d, Further, an assembling plate 47 is provided on the front and rear portions of the back surface of the bottom plate 46 at appropriate intervals so as to be provided downward from the end surface of the bottom plate 46. This is done by screwing the bottoms of the plate 44 and the rear plate 45.

The light-collecting box 40A assembled in this manner is assembled on the back surface 1 la of the position of the laser beam irradiation from the scanning unit U on the circular-arc surface 11 of the circular-arc table 10 to collect light. Done. That is, the laser beam transmitted through the slit 13 provided at the laser beam irradiation position from the scanning unit U on the arcuate surface 11 passes through the focusing box 40A to the ceiling plate 41 and the slit 13 to the slit 13. The laser light that penetrates the slit 41b formed correspondingly and enters, and then enters the light-collecting box 40A, repeats irregular reflection appropriately in the light-collecting box 40A, and the rear plate. The laser beam incident on the photodetector 50 attached to a pair of attachment members 48 formed at appropriate intervals on the photodetector 45, and the laser beam incident on the photodetector 50 is discharged in the same manner as before. The signal is converted to a signal and sent to a concentration detector (not shown). The density detector detects the density of the laser beam transmitted through the film F in accordance with the signal input from the photodetector 50 in the same manner as in the related art. The assembly of the light-collecting box 40A to the arc table 10 is performed, for example, by locking the screws that attach the ceiling plate 41 to the side plates 42 and 43 to the arc table 10 (see FIG. 11).

In this case, the laser beam transmitted through the slit 41b formed on the ceiling plate 41 is scattered as appropriate to enter the light collection box 40A as evenly as possible. Where is formed is scattering Covered by membrane 49. As the scattering film 49, for example, a material obtained by removing an adhesive from a Scottish tape (trade name, manufactured by Sumitomo 3M) is used.

In order to condense the laser light that has entered the light-collecting box 40A while reducing the absorption inside the light-collecting box 40A, a coating is applied inside the light-collecting box 40A. This coating is carried out, for example, by applying a mixture of a water-based acrylic coating and a sulfuric acid barrier at a volume ratio of 1 to 10 and dissolving it in purified water to form a cream-like coating. It is done by and. In this coating, sanding is performed appropriately so as not to generate extra unevenness on the surface.

This coating is specifically performed as follows.

(1) The ceiling plate 41, the left and right side plates 42, 43, the front plate 44, the rear plate 45, and the bottom plate 46 are washed with alcohol to remove oils and fats.

(2) Prepare a coating agent. For example, a mixture of an aqueous acrylic paint and a sulfuric acid barium at a volume ratio of 1 to 10 is dissolved in purified water to form a hobby cream. Here, as the water-based acrylic paint to be used, a white for floor (trade name) manufactured by Nippon Paint Co., Ltd. is used. ) There is Bali Gendelux (trade name) manufactured by Fushimi Pharmaceutical.

(3) The obtained coating agent is thinly applied to the inner surfaces of the ceiling plate 41, the left and right side plates 42, 43, the front plate 44, the rear plate 45, and the bottom plate 46. In this way, the so-called underlying treatment of each inner surface 41, 42, 43, 44, 45, 46 is performed.

(4) After the primer has dried, apply undercoat. In this case, the film thickness is lmn! ~ 2mm.

(5) After the undercoat has dried, apply a sandpaper to remove any unevenness on the coating and level it.

(6) After finishing the sandpaper hanging, assemble the light collecting box 40A in a semi-finished state except for the ceiling plate 41 and the rear plate 45.

(7) After assembling the light collection box 40A in a semi-finished state, apply intermediate coating. this Intermediate coating is also applied to ceiling panels 41 and rear panels 45 that are not assembled. In this case, the film thickness is 2mn! ~ 3mm.

(8) After the intermediate coat has dried, apply sandpaper to remove any unevenness on the coating and flatten it.

(9) After finishing sanding, finish coating. This finish is also applied to the unattached ceiling panel 41 and rear panel 45. In this case, the thickness of the coating is in the range of 3 mm to 4 mm.

(10) After the finish coat has dried, sand coat it to remove any unevenness on the coating and flatten it. In this case, the thickness of the coating is 3 mm or more. (11) Attach the rear plate 45 to the light collection box 40A assembled in a semi-finished state.

(12) Apply a coating agent to the abutment of each plate 42.43, 44, 45 of the light-collecting box 40A with the ceiling open.

(13) Assemble the ceiling plate 41 to complete the light collection box 40A.

FIG. 11 and FIG. 12 show a width aligning mechanism 60 for adjusting the position in the width direction of the finolem F used in this embodiment. The width alignment mechanism 60 includes a width alignment member 61, a driving mechanism 62 that drives the width alignment member 61, and a mounting member 63 that mounts the width alignment member 61 on the drive mechanism 62. A pair of the width aligning mechanism 60 and the opposed arrangement are arranged on the arc table 11 at predetermined intervals (see FIG. 11). Then, the width of the film F is adjusted by appropriately moving the arranged width aligning member 61 or the guide groove 14 provided on the circular arc surface 11.

Specifically, the drive mechanism 62 includes a flexible rack 64 made of synthetic resin and a motor (not shown) having a pinion for driving the rack 64. You. The rack 64 is slidably mounted on a guide 15 provided at an appropriate position on the back surface 11a of the arc surface 11.

In FIG. 12, reference numeral 65 denotes a bolt for rotatably fixing the width aligning member 61, reference numeral 66 denotes a nut screwed to the bolt, and reference numeral 67 denotes a mounting member 63. A bolt fixed to the bolt 64 and a space nut 68 screwed to the bolt 64 are shown.

Next, the reading of the film F by the reading device R having such a configuration will be described with reference to FIGS. 13 to 17. Each of the following operations is performed by an instruction from the control device N.

(1) Turn on the power and pull up the upper guide 26 to the specified position (see Fig. 13).

(2) Insert the film F into the reader R by hand from the insertion slot and set it (see Fig. 14).

(3) Lower the upper guide 26 to a predetermined position, and clamp the film F between the driving rollers 23, 23 and the driven rollers 24, 24 (see FIG. 15).

(4) Drive the first drive unit 21 and the second drive unit 22 to retract the film F to a position where the tip of the film F is out of the laser beam from the scanning unit U (see FIG. 16).

(5) When the film F is transported by the first drive unit 21 and the second drive unit 22 and the leading end of the film F reaches a predetermined position, the first drive unit 21 and the second drive unit The drive unit 22 is stopped, and the transport of the film F is stopped.

(6) Scanning unit U scans laser beam

(Main scanning) is started.

(7) When the scanning of one line is completed, the irradiation of the laser beam from the scanning unit U is stopped, and the first driving unit 21 and the second driving unit 22 are driven again. A predetermined amount of film F is sent.

Hereinafter, a predetermined range of the film F is similarly scanned.

Thus, according to this embodiment, the use of the F lens in the optical system can be abolished, despite the simplification of the film transport mechanism. Therefore, the cost of the reading device R including the scanning unit U can be reduced. Further, according to the present embodiment, since the light collecting device 30 is mounted on the back surface 11a along the width direction of the arc surface 11 of the arc table 10, the width of the light collecting device 30 can be minimized. Can, CT JP / 031 7

14

The light can be condensed on the light condensing device 30 at a constant scanning speed of the laser beam over the entire irradiation range. As a result, it is possible to improve the accuracy of Macau detection while preventing the use of the reader R from being unnecessarily large. Furthermore, since the light collecting box 40A constituting the light collecting device 30 is formed by combining flat plates, it is easy to manufacture the light collecting box 30A including the inner surface coating. Industrial applicability

As described above in detail, according to the present invention, an excellent effect that the use of an F-lens in an optical system can be eliminated even though the film transport mechanism is simplified. Can be Therefore, the cost of the reading device including the scanning unit can be reduced.

Further, according to the present invention, since the light concentration device for the film density detector is mounted on the back surface of the arc surface along the width direction of the arc table of the reading device, the film concentration detector for the film port detector is provided. An excellent effect that the width of the optical device can be minimized, and that the laser beam scanning speed can be kept constant with the beam concentrator S for film detectors over the entire irradiation range. Is obtained. As a result, there is also obtained an excellent effect that the density can be detected with high accuracy while preventing the useless size of the reader. Furthermore, since the light collection box that constitutes the light collection device for the film concentration detector is made up of a combination of flat plates, it has an excellent effect that it is easy to manufacture including the inner surface coating. Is also obtained.

Claims

The scope of the claims

1. The transmission device S for a transmission type pho- nolem, which is provided with film transport means for transporting the film placed on an arcuate surface approximating the free bending curve of the film. And a transmissive film reader.

2. A film holding means having an arcuate surface approximating a free deflection curve of the film, a driving roller disposed below the arcuate surface, and the arc corresponding to the driving roller. And a driven member disposed above the surface, the driven member being capable of abutting on a driving member of the driving roller or a film rear surface, and a driven member of the driven roller being a film. A transmissive film reading device, comprising: a film transport means capable of contacting the film surface.

3. The transmission-type film reading apparatus according to claim 2, wherein two sets of a driving roller and a driven roller are used, and each set is opposed to each other across the main scanning surface.

4. The driving member of the driving roller is a pair of driving wheels mounted on the driving shaft at a predetermined interval, and the driven member of the driven roller corresponds to the driving wheel. 3. The transmission film reading device according to claim 2, wherein the transmission film reading device comprises a pair of driven wheels mounted thereon.

5. The transmissive film reader according to claim 4, wherein a contact surface of the drive wheel and the driven wheel with the film is an arc surface.

6. The transmission film reader according to claim 2, wherein the driven roller is configured to be able to move up and down.

7. A box-shaped main body having a longitudinal direction in the scanning direction of the laser beam, which is formed by combining flat plate members, and a ceiling member and a bottom member parallel to each other; And a pair of light detecting means disposed at appropriate positions on the surface, wherein the film of the box-shaped main body is placed and transported. A ceiling member abutting on the back surface of the shell-shaped member to be sent is formed along the back surface of the killing member, and a laser for allowing the ceiling member to enter laser light into the body. 4. The transmission film reading device according to claim 2, further comprising a light collecting device for a film intensity detector having a slit formed along a scanning direction of light.

8. The transmission type film reader according to claim 7, wherein the slit is covered with a scattering film that scatters light appropriately.

9. Reading instrumentation ® transmission type full Lee Noremu according to claim 7, wherein said box-shaped body inner surface, characterized in that the coating which prevent the absorption of the laser light that has entered the same body內is formed ₀

10. The transmissive film reading device according to claim 1, further comprising a film width aligning means.

11. The transmission type filter according to claim 10, wherein the width aligning means comprises a width aligning member capable of moving forward and backward in the width direction of the film, which is opposed to the width aligning member. Lum reader.

1 2. A film transport device used for a transmissive film reader, which transports a film by placing it on an arcuate surface approximating the free replacement curve of the film. Film transport equipment e.

13 3. A film holding means having an arcuate surface approximating the free-holding curve of the film, a drive roller disposed below the arcuate surface, and a drive port described above. And a driven roller disposed above the circular arc surface in correspondence therewith, wherein the driving member of the driving π-lar can be brought into contact with the back surface of the film,

A film transport device, characterized in that a driven member of the driven roller can be brought into contact with a film surface.

14. The film transport according to claim 13, wherein two sets of a drive roller and a driven roller are used, and each set is opposed to each other across the main scanning surface. apparatus.

15 5. The drive member of the drive roller provides a predetermined space on the drive shaft. The driven member is a pair of driven wheels mounted on the shaft member, and the driven member is a pair of driven wheels mounted on a shaft member corresponding to the driven wheel. 13. The film transport device according to 3.

16. The film transport device according to claim 15, wherein a contact surface of the drive wheel and the driven wheel with the film is an arc surface.

17. The film transport device according to claim 13, wherein the driven roller is configured to be able to move up and down.

18. The film is placed and transported on the upper surface of the shell-like member formed in an arc, and the laser beam is scanned on the transported film surface, and the transmitted light is collected. What is claimed is: 1. A light-collecting device for a film-density detector used in a film-density detector for detecting the film concentration, wherein the light-concentrating device for a film-density detector comprises a combination of a plate member. A box-shaped main body having a longitudinal direction in the scanning direction of the laser beam and having a ceiling member and a bottom member parallel to each other, and an appropriate position on a surface of the main body parallel to the laser light scanning surface. A ceiling member which is in contact with the back surface of the shell-shaped member on which the box-shaped main body film is placed and conveyed, It is formed along the back surface and allows the laser beam to enter the main body through the ceiling member. A condensing device for a film angle detector, wherein a slit is formed in a scanning direction of a laser beam.

19. The light condensing device for a film density detector according to claim 18, wherein the slit is covered with a scattering film that scatters light appropriately.

20. The light-collecting device for a film density detector according to claim 18, wherein the upper surface of the box-shaped main body is formed with a coating for preventing absorption of a laser beam that has entered the main body.