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WO2000004360A1 - Procede de determination de la qualite d'une plaque lenticulaire - Google Patents

Procede de determination de la qualite d'une plaque lenticulaire Download PDF

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Publication number
WO2000004360A1
WO2000004360A1 PCT/US1999/013379 US9913379W WO0004360A1 WO 2000004360 A1 WO2000004360 A1 WO 2000004360A1 US 9913379 W US9913379 W US 9913379W WO 0004360 A1 WO0004360 A1 WO 0004360A1
Authority
WO
WIPO (PCT)
Prior art keywords
lenticular sheet
grating
lenticules
mole percent
lenticular
Prior art date
Application number
PCT/US1999/013379
Other languages
English (en)
Inventor
James Samuel Nelson Dalton
Jon Thomas Moore
Original Assignee
Eastman Chemical Company
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 Eastman Chemical Company filed Critical Eastman Chemical Company
Publication of WO2000004360A1 publication Critical patent/WO2000004360A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays

Definitions

  • the present invention relates to a method for determining the quality of a lenticular sheet material and more particularly, to a method for determining the quality of a lenticular sheet prior to its utilization in the imaging arts.
  • the photograph can then be scanned into a computer and subsequently split apart into a multitude of image lines interleaved from the plurality of angularly displaced images also know as "bundles". Each bundle contains an image line from each of the original images in sequence. These images are then combined or "laid up” onto a single compressed print consisting of a pattern of very narrow bands. When the image bundles are equal in width and abut one another, the width of a bundle is the "pitch". When image bundles of equal width are equally spaced apart the pitch is the sum of the bundle width and the width of the space between the bundles.
  • Lenticular lenses used to produce the three-dimensionality are well known and commercially available from a variety of manufacturers. These lenses typically consist of an array of identical spherically-curved surfaces embossed or otherwise formed on the front surface of a plastic sheet. Other geometric patterns for the lens may also be used such as pyramidical. In the case where the lens is spherically-curved, each individual lens or lenticule resembles a semi-cylinder extending the full length of the underlying image over which it is superposed. The back surface of the lens is typically substantially flat or planar and is the surface in contact with or adjacent to the underlying flat image.
  • the lenticular sheet overlay has the same pitch as the bundles in the compressed print so when the lenticular sheet is placed over the image, and in proper alignment with the image lines, the compressed print projects the plurality of images at different viewing angles corresponding to the viewing angles of the original scene.
  • image changes are small and gradual to simulate what a viewer would perceive as he would move past the image. It is important that the compressed print be properly centered to the lenticular array and that the scan lines be parallel to the axes of the lenticules forming the lenticular sheet.
  • Moire interference results from the overlapping of two or more grid patterns which detracts from the clarity and viewer's enjoyment of the image. Moire interference may also be produced when the lenticular sheet does not have the desired number of lenticules per unit of measurement or the lenticular sheet has an irregular number of lenticules per unit of measurement causing the final image to have an inexact registration and be of less than optimal quality.
  • U.S. Patent No. 5,633,719 issued to Oehlbeck et al. on May 27, 1997 discloses a method for aligning a lenticular overlay with an image print having lenticular print bundles.
  • the method uses two-dimensional fiducial indicia on the image surface.
  • the lenticular sheet is superposed over the image and moved until at least two coaxial indicia on the print margin coincide with a single lenticule juncture.
  • U.S. Patent No. 5,457,515 issued to Quadracci et al. on October 10, 1995 discloses a method of forming a three-dimensional graphical image using a lenticular sheet.
  • the image elements are printed onto the flat side of the lenticular sheet at an angle which corresponds to the pitch of the lenticules of the lenticular sheet.
  • European Patent Application 0 619 513 discloses a method of correcting alignment of a preprinted film to a lenticular material to compensate for affects such as shrinking and curvature. The method includes placing registration images on the outer edges of the film so that alignment between the lenticules and the registration areas is achieved.
  • European Patent Application 0 743 552 discloses a method for producing lenticular images by projecting the images directly onto a photosensitive emulsion which is coated on the back surface of the lenticular sheet prior to exposure.
  • This invention relates to a method of judging the quality or fitness for use of a lenticular lens, and particularly to a method of determining a sheet's quality or fitness to produce a three-dimensional like image with reduced moire and improved clarity, prior to positioning the lenticular lens over a printed or photographic image.
  • the invention provides a method comprising the steps of superposing a lenticular lens over a grating having a known number of spaced apart lines per unit of measurement; and evaluating a resulting moire fringe pattern to determine the number of lenticules per unit of measurement in the lenticular sheet. By evaluating the fringe pattern, the quality of the lenticular sheet may also be determined.
  • the lenticular sheet is superposed over the line grating in a non-registration relationship. That is, the rotational alignment of the lenticular sheet and the line grating are purposefully obliquely angled so that a moire fringe pattern is produced.
  • FIG. 1 is an exploded, isometric view of a lenticular overlay and a grating having a known number of lines per unit length.
  • FIG. 2 is a depiction of a lenticular lens having two different side-by-side pitches
  • FIG. 3 illustrates the moire fringe pattern produced from the lenticular sheet of FIG. 2 having two different pitches, 94 and 106 lenticules per inch, when superposed over a grating having 100 lines per inch, (lpi) and skewed at an angle of less than about 15 degrees.
  • FIG. 4 shows an angle indicia which may be placed on the line grating as a means for obliquely aligning the lenticular lens and the lines of the grating.
  • FIG. 5 illustrates the moire fringe pattern produced from a lenticular sheet superposed over a grating having 30 lpi.
  • FIG. 6 illustrates the fringe pattern produced from a lenticular sheet superposed over a grating having 34 lpi.
  • FIG. 7 illustrates the moire fringe pattern produced when a 32.4 lpi lenticular sheet is superposed over a grating having 30.0 lpi.
  • FIG. 8 illustrates the moire fringe pattern observed on a Lunometer Type F.
  • a method for determining the quality of a lenticular lens includes the step of superposing a lenticular lens 10 over a grating 12 having a known number of spaced apart lines 14 per unit of measurement; and evaluating a resulting moire fringe pattern 16, seen in FIG. 3, to determine the number of lenticules 18 per unit of measurement.
  • the term "per unit of measurement” is a unit arbitrarily chosen by the person skilled in the art, but generally is understood to be a means of measuring distance.
  • the unit of measurement can include, but is not limited to, inches, feet, yard, millimeters, centimeters and meters.
  • the lenticular lens 10 is provided in a sheet format having a planar surface 20 which, when the lenticular lens 10 is utilized for making a three-dimensional composite image is positioned adjacent to and superposed over the image. Positioned distally from the planar surface 20 is an array or plurality of adjacently positioned curvilinear surfaces of the individual lenticules 18. As illustrated, each lenticule 18 is a semi-cylindrical member having a longitudinal axis, X, with substantially identical curved surface embossed or otherwise formed on the plastic sheet. The radius of curvature of the lenticule 18 determines its width and focal length.
  • the shape of the lenticule 18 can be adjusted to facilitate shorter focal lengths without having as great a multiplicity of lenticules 18 per unit of measure by forming each lenticule with a greater curvature at its apex than throughout the remainder of the lenticule to provide a shorter focal length with a broader overall lenticule cross-section.
  • each lenticule has a large cross-section, a better three- dimensional effect is achieved by the lateral alignment of each lenticule 18 over each element of the composite image.
  • the number of lenticules 18 per unit of measurement comprising the lenticular lens 10 can vary from about 3 per inch to about 250 per inch. Preferably, the number of lenticules 18 per unit of measurement ranges from about 15 per inch to about 150 per inch, and more preferably, from about 25 per inch to about 75 per inch. Generally, as the number of lenticules 18 increases and the corresponding image elements or bundles are made narrower, the need for precise alignment of the lenticular sheet 10 over the image is reduced.
  • the preferred materials useful in forming the lenticular lens 10 are those capable of being thermoformed using techniques known to those skilled in the thermoplastic art.
  • Non-limiting examples of such materials include: polyesters, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and copolyesters of terephthalic acid and aliphatic glycols such as PETG 6763 (available from Eastman Chemical Company, Kingsport, Tennessee); polycarbonates; polystyrene; acrylics and polyacrylates, such as, poly(methyl methacrylate), methyl methacrylate and copolymers thereof with other vinyl monomers such as other alkyl methacrylates or alkyl acrylates and the like; polyolefins such as polyethylene; vinyl chloride polymers such as polyvinyl chloride (PVC) and its copolymers with other vinyl monomers such as vinylidene chloride, styrene and the like including heavily plasticized PVC compositions or rigid vinyl formulations; polyure
  • Particularly preferred materials suitable for forming the lenticular lens 10 are copolyesters of terephthalic acid and aliphatic glycols.
  • the acid component of the copolyester is at least 75 mole percent terephthalic acid.
  • the acid component may be modified with up to about 25 mole percent of dibasic acids containing about 4 to about 40 carbon atoms such as naphthalenedicarboxylic, succinic, glutaric, azelaic, adipic, suberic, sebacic, isophthalic, sulfoisophthalic, 1 ,4-cyclohexanedicarboxylic acid and mixtures thereof.
  • naphthalenedicarboxylic acid isomers or mixtures of isomers may be used such as the cis-, trans-, or cis/trans mixtures of 1 ,4-cyclohexanedicarboxylic acid, but the 1,4-, 1,5-, 2,6-, and 2,7-isomers are preferred.
  • the aliphatic glycol component of the copolyester has from about 97 mole percent to about 35 mole percent ethylene glycol and from about 3 mole percent to about 65 mole percent 1,4-cyclohexanedimethanol. More preferably, the aliphatic glycol component of the copolyester has from about 75 mole percent to about 65 mole percent ethylene glycol and from about 25 mole percent to about 35 mole percent 1,4-cyclohexanedimethanol.
  • glycol component used in the esterification of the copolyester may be further modified with up to 20 mole percent with glycols such as diethylene glycol, propylene glycol, neopentyl glycol, 1 ,4-butanediol, 1,6-hexanediol, 2,2,4,4-tetramethyl-l,3-cyclobutanediol, 1,3-propanediol, cis/trans mixtures of 1 ,4-cyclohexanedimethanol and mixtures thereof.
  • glycols such as diethylene glycol, propylene glycol, neopentyl glycol, 1 ,4-butanediol, 1,6-hexanediol, 2,2,4,4-tetramethyl-l,3-cyclobutanediol, 1,3-propanediol, cis/trans mixtures of 1 ,4-cyclohexanedimethanol and mixture
  • Suitable materials for forming the lenticular lens 10 are commercially available from BASF Corporation under the name ELASTOLLAN®, B.F. Goodrich under the name ESTANE®, Bayer Corporation under the names TEXIN® and DESMOPAN®, and Dow Chemical Company under the name PELLETHANE®.
  • the lenticules 18 can be formed using techniques that are known to those skilled in the thermoplastic art.
  • a thermoplastic resin such as those discussed above, can be extruded by means of a conventional melt extrusion process with the curvilinear surfaces of the lenticules 18 being formed by subjecting the molten sheet to a chilled grooved cylindrical roll.
  • the lenticular lens 10 can also be produced by application of a UV-curable thermosetting resin to a flat thermoplastic sheet. The coated flat sheet is then subjected to a grooved roll and subsequent UV curing.
  • the thickness of the thermoplastic sheet used in forming the lenticular lens 10 can range from about 0.04 of an inch to about 0.5 of an inch.
  • the grating 12 generally has a height (H) and a width (W) that are substantially equal to the respective dimensions of the lenticular lens 10. Desirably, the grating 12 has a height (H) and width (W) dimension of not less than 75 percent of the lenticular lens 10.
  • the grating 12 can be made from any material that is capable of having the plurality of precisely spaced apart lines 14 placed thereon. Suitable materials include rigid and semi-rigid, crystalline or amorphous materials. Desirably, the materials have glass transition, Tg, greater than about 5 and preferably greater than about 15. For instance, suitable materials include glass; thermoplastics such as those described above, UV curable acrylics and thermosetting epoxies.
  • Flexible materials such as paper and thermoplastic films may further be utilized for producing the grating 12, provided the flexible material has a suitably rigid backing material or substrate for substantially preventing pitch distortion of the lines attributed to flexing, shrinking or stretching of the flexible material.
  • the flexible material may be suitably affixed to the rigid backing using mechanical fasteners such as screws, bolts, rivets, and the like or laminated thereto using compatible adhesives for the selected materials.
  • the spaced apart lines 14 may be placed on or in the grating substrate using methods well known to those skilled in the art, such as, etching, engraving and preferably, printing using such methods as web offset, flexographic, gravure, stochastic or electronic deposition using laser printing, video jet or ink jet.
  • Other methods of fabricating a grating 12 having spaced apart lines 14 include using a photosensitive material, such as a photographic film, and a laser to precisely define and position the lines 14.
  • Another method includes inserting a solid material, such as fine wire or strands of a natural or synthetic material, in machined grooves or channels of a transparent material.
  • the groves can be formed in one material then overlaid by, and preferably laminated to, another grooved or nongrooved layer. Alternatively, the grooves or channels may be formed through the substrate.
  • the grating's plurality of spaced apart lines 14 have a predetermined pitch or number of lines 14 per unit of measurement.
  • the pitch of the lines 14 may differ from the targeted pitch of the lenticular lens by less than about 15 percent, preferably, less than about 10 percent and more preferably, less than about 5 percent. Most preferably, the pitch of the lines 14 is substantially equal to the targeted pitch of the lenticules 18 on the lenticular lens 10.
  • the lenticular lens 10 is superposed over the grating 12 of a known line pitch in a manner whereby a moire fringe pattern 16 is generated.
  • the moire fringe pattern 16 is produced when: the lenticular lens 10 does not have the desired number of lenticules 18 per unit of measurement relative to the grating 12, the lenticular lens 10 has an irregular number of lenticules 18 per unit of measurement, or when the parallel lines 14 of the grating 12 and the axis, X, of the lenticules 18 parallel to the lines 14 are superposed at a slight angle to each other, i.e., rotationally misaligned.
  • the pitch of the resultant moire fringe pattern 16 is used to determine the number of lenticules 18 per unit of measure.
  • the resultant moire fringe pattern 16 is irregular one can further determine if the lenticular lens 10 is irregular.
  • the longitudinal axis, X, of the lenticules 18 is positioned at an acute angle of less than about 15 degrees out of registration, preferably, less than about 10 degrees, and more preferably less than about 5 degrees out of registration.
  • registration means that the parallel spaced apart lines 14 of the grating 12 are substantially parallel, rotationally, to the axis, X, of the lenticules 18, and desirably having no more than about 3 minutes to about 1 degree of rotational misalignment.
  • the grating 12 may further include an angled indicia 24, as seen in FIG. 4.
  • the angled indicia 24 is desirably printed at the desired angle on the grating 12.
  • the angled indicia 24 can be located anywhere within the grating, but preferably is spaced from the outer edge of the grating 12 at any distance which is a multiple of the pitch of the lines 14.
  • the angled indicia 24 can be any shape having at least one acute angle such as a triangle, diamond, arrow, chevron, or other polygon.
  • the image of the angled indicia 24 changes as viewed through the lenticular lens 10.
  • the lenticular lens 10 is at the desired angled relationship with respect to the grating 12.
  • thermoplastic lenticular sheet having two different side-by-side pitches (or lenticules per inch) of 94 and 106 lenticules per inch was extruded using EASTMAN PETG 6763 copolyester.
  • the lenticular sheet was superposed over 100 lpi line grating (line width of 0.005 inches on glass) prepared for the Shirley Institute by Schmidt Manufacturing Company.
  • the lenticular sheet was rotationally misaligned at a slight angle of about 10 degrees.
  • a moire fringe pattern was observed having an abrupt change in the fringe direction (as shown in FIG. 3). This example demonstrates the ability to visually determine that the pitch of the lenticular sheet changed without actually counting the number of lenticules per unit length of sheet by observing the difference in the direction of the moire fringes.
  • a line grating having a size of 8.5 x 11 inches and 30 lines per inch (0.003-inch line width) was prepared using a Pascal line-generating program.
  • the line grating was printed on a Hewlett Packard Laser Jet 4 printer.
  • the line grating was measured at selected points using an image analysis technique.
  • the line grating was scanned with Hewlett Packard Scan Jet 4C scanner using sharp black and white photograph mode at four different areas of the sheet ranging from 5 to 7 lenticules in length.
  • the image was cropped to reduce file size with Micrografx Picture Publisher software and analyzed with Image Tool software.
  • An image analysis micrometer (10-mm scale, 0.005-mm divisions) was used for spatial calibration in the analysis.
  • the mean line pitch was 30.10 lines per inch and the standard deviation was 0.0071 lines per inch.
  • thermoplastic lenticular sheet extruded from EASTMAN PETG 6763 copolyester using a lenticular grooved roll having a targeted 32.5 lenticular grooves per inch was superimposed over the above 30.10 lpi line grating.
  • Four measurements were made using a 7X magnification loupe and a C Thru brand plastic ruler with 1 mm graduations of unknown calibration to determine the mean fringe pitch (2.65 fpi) and the fringe pitch standard deviation (0.006 fpi) of the moire fringe pattern (see FIG. 5). Based on Equation 1, the mean lenticular pitch of the sheet was calculated to be 32.75 lenticules per inch.
  • the decision to subtract or add the mean fringe pitch of 2.65 fpi to 30.10 lpi in Equation 1 is made by examining the direction of the fringes as the lenticular sheet is rotated clockwise over the line grating. If the fringes move counter clockwise, the lenticular sheet lpi is less than the line grating lpi. In this case, f, is the line grating and f 2 is the lenticular sheet pitch. If the fringes move clockwise, then the number of lenticules per in on the lenticular sheet is greater than the line grating lpi. In this example, f, is the lenticular sheet and f 2 is the line grating.
  • the lenticular sheet from Example 2 was superimposed over a glass line grating having 34 lpi (prepared for the Shirley Institute by Schmidt Manufacturing Co.).
  • the resultant moire fringe pattern, as seen in FIG. 6, was measured visually with a scale and found to have a pitch of about 1.6 fringes per inch.
  • the number of lenticules per inch in the sheet was calculated to be 32.4.
  • thermoplastic lenticular sheet was extruded from EASTMAN PETG 6763 copolyester having a targeted 32.5 lenticules per inch.
  • a Lunometer brand Type F line grating with increments ranging from 25 to 60 lines per inch in increments of 1 line per inch was superimposed over the above lenticular sheet.
  • a series of parabolic moire fringe patterns was produced having an apex between the 32 to 33 readings on the Lunometer scale (see FIG. 8). As estimated, the sheet had 32.5 lenticules per inch.
  • H.P. Luhn Associates produced the Lunometers. The Lunometer was designed and marketed for use in measuring the number of threads or courses per inch in woven textiles. In this range, this Lunometer was useful for discriminating the number of lenticules to one-half lenticule per inch.
  • This example demonstrates the use of moire fringe patterns to visually examine large lenticular sheets for distortion.
  • a 2 x 3 feet lenticular sheet as described in Example 2 was extruded using EASTMAN PETG 6763 and superimposed over the line grating. The sheet was pressed flat to remove any air between the grating and the lenticular sheet. The moire fringe patterns were 2.6 per inch across the sheet. No obvious visual distortion of the fringe pattern was observed over the entire lenticular sheet. A portion of the pattern is shown in FIG. 6.
  • Example 2 A portion of the lenticular sheet in Example 2 was placed, lenticule side down, on a Hewlett Packard Scan Jet 4C scanner with a Shirley 34 lpi glass line grating superimposed on the lenticular sheet. They were scanned at a 2400 dpi using the sharp black and white photo setting.
  • the moire image, FIG. 6, was cropped using Micrografx Picture Publisher software to reduce the file size.
  • the file was transferred to Image Tool, an image analysis program. The distance between fringes was measured and the fringe pitch was calculated to be about 1.6. Using Equation 1, and observing the direction of rotation of the moire fringe pattern, the number of lenticules per inch in the sheet was calculated to be 32.4.
  • EXAMPLE 7 EXAMPLE 7
  • a line grating having 32.50 lpi and a line width of 0.00770 was prepared using Free Hand software and output to an Agfa Select Set 7000 image setter and onto a 20 x 25 inch clear film.
  • a PETG lenticular sheet (22 x 27 inches) as described in Example 2 (with a target 32.5 lenticules per inch) was superimposed over the line grating.
  • the measured fringe pitch was 1 fringe per 14 inches or 0.071 fringes per inch.
  • the number of lenticules per inch in the sheet i.e., the pitch of the sheet, was calculated to be 32.57.
  • This example demonstrates the preferred use of moire patterns (or the lack thereof) to align the lenticular sheet with a line grating to check for registration.
  • a line grating having 20 opaque lines per inch, a line width of 0.0250 of an inch, and a space width of 0.0250 of an inch was prepared using Free Hand software. The output was sent to an Agfa Select Set 7000 image setter and onto a clear film measuring 20 x 25 inches.
  • a lenticular sheet measuring 22 x 27 inches and having a target of 40 lenticules per inch was superimposed over the line grating. Using a 7X loupe to register with the line grating, the lenticular sheet was rotated until the fringe pattern disappeared. Sharp black lines and clear spaces were observed on each alternate lenticule of the lenticular sheet with no fuzzy or gray lines over the entire lenticular sheet.
  • This example demonstrates the use of the method on a lenticular sheet having a different cross-sectional shape from the previous examples.
  • a Lunometer brand Type R line grating having from 50 to 120 lines per inch in increments of 1 line per inch is superposed over a sample prismatic film manufactured by 3M. This film has lenticules with a triangular cross-sectional shape as compared to the circular cross-sectional shapes of the previous examples.
  • Moire fringe patterns provide a means for visually detecting minute differences between the line grating 14 and the lenticular lens 10.
  • the precision and accuracy of moire fringe test method for determining the number of lenticules 18 per unit length of sheet is partly limited by the precision and accuracy of the scale or device used to measure the fringes 16, by the accuracy and precision of the line grating 14 used to generate the fringes 16, and by the measurement technique.
  • the ability to discriminate between lenticular sheets of varying pitch depends on the accuracy of the instruments used to make the measurements. A rule that allows one to measure 1/16 of an inch will not discriminate as well as an image analysis technique that allows one to measure to a few microns.
  • the precision of the moire fringe test method is linked to how precisely the grating 14 is calibrated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Stereoscopic And Panoramic Photography (AREA)

Abstract

L'invention concerne un procédé d'évaluation de la qualité d'une plaque lenticulaire avant son utilisation. La plaque lenticulaire ayant un nombre indéterminé de lenticules par unité de mesure est positionnée sur un réseau ayant un nombre connu de lignes par unité de mesure. Le diagramme de frange moiré obtenu est évalué afin de déterminer le nombre de lenticules que comporte la plaque lenticulaire par unité de longueur.
PCT/US1999/013379 1998-07-15 1999-06-14 Procede de determination de la qualite d'une plaque lenticulaire WO2000004360A1 (fr)

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US11633098A 1998-07-15 1998-07-15
US09/116,330 1998-07-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308286A (zh) * 2013-06-25 2013-09-18 上海理工大学 立体印刷用柱镜光栅参数检测方法
FR3124000A1 (fr) * 2021-06-15 2022-12-16 Idemia France Formation d’une image 3D à partir d’une structure lenticulaire

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5362351A (en) * 1992-01-15 1994-11-08 Karszes William M Method of making lenticular plastics and products therefrom
JPH07140041A (ja) * 1993-11-17 1995-06-02 Toppan Printing Co Ltd モアレによるレンチキュラーシートの精度検査方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5362351A (en) * 1992-01-15 1994-11-08 Karszes William M Method of making lenticular plastics and products therefrom
JPH07140041A (ja) * 1993-11-17 1995-06-02 Toppan Printing Co Ltd モアレによるレンチキュラーシートの精度検査方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 103 31 October 1995 (1995-10-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308286A (zh) * 2013-06-25 2013-09-18 上海理工大学 立体印刷用柱镜光栅参数检测方法
FR3124000A1 (fr) * 2021-06-15 2022-12-16 Idemia France Formation d’une image 3D à partir d’une structure lenticulaire
WO2022263772A1 (fr) * 2021-06-15 2022-12-22 Idemia France Formation d'une image 3d a partir d'une structure lenticulaire

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