JP2011191615A - Method for producing double-sided lenticular lens sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided lenticular lens sheet that achieves high productivity, while keeping high positional accuracy of an optical axis of a lenticular lens formed at both sides of a base material. <P>SOLUTION: A method is provided for producing the double-sided lenticular lens sheet, wherein a metal die is pressed to a coating film for forming the lenticular lens formed at both sides of a support to mold lenticular-shaped lenses at both sides. The method includes: a guide forming step of forming a guide at least on one side of the support; and a lenticular-shaped lens molding step of molding the lenticular-shaped lenses after positioning of the metal die by the guide. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a double-sided lenticular lens sheet having a lenticular lens structure on both sides.

  A lenticular lens sheet having lenticular lenses formed on both sides has long been used for projection screens such as projection televisions and microfilm readers and various optical products. Application to stereoscopic image display has also been known for a long time. As an example of application to the stereoscopic image display, an image displayed on the display unit can be stereoscopically viewed by arranging a lenticular lens sheet in front of the display unit that displays the image. This method is suitable for use in a flat display using a liquid crystal, plasma, organic electroluminescence panel or the like that has been widely used in recent years.

  Conventionally, such lenticular lens sheets have been made by using a transparent resin material such as acrylic resin, polycarbonate resin, vinyl chloride resin, styrene resin, and the like. A press molding method is known in which a lens-type lenticular lens pattern is transferred by heating and pressing the same.

  However, in the injection molding method, it is difficult to mold a large size lenticular lens sheet, and it can be used only for molding a relatively small size lenticular lens sheet. In addition, since the heating and cooling cycle of the resin plate and the lens mold takes a long time in the press molding method, a large number of lens molds are necessary for mass production of lenticular lens sheets, and a large lenticular lens sheet is produced. This entails enormous costs for production equipment.

  On the other hand, Japanese Patent Application Laid-Open No. 07-148856 discloses a double-sided lenticular lens sheet having optical characteristics by accurately transferring a lens-type lenticular lens pattern onto a previously prepared sheet base material. A method of making is disclosed. As a drawback of these manufacturing methods, since the optical axis shift of the double-sided lenticular lens is likely to occur, a method that prevents the optical axis shift from being studied has been studied. In particular, in a double-sided lenticular lens sheet, a fine pitch of the lenticular lens has been demanded in order to cope with high definition of the image, and the alignment of the double-sided lenticular lens is important. In particular, if the optical axes of both surfaces do not overlap with each other in a direction perpendicular to the surface, the aberration increases as in the case of a normal lens, and the screen characteristics such as color balance and color unevenness are adversely affected.

  For this reason, a method for producing a double-sided lenticular lens in which optical axis misalignment on both sides is prevented has been studied. For example, a first cylindrical lens mold and a second cylindrical lens mold, which are opposed to each other with a certain interval and both cylindrical lens molds are independently movable in the cylindrical axis direction, are used. A method for producing a double-sided lenticular lens in which the axis is corrected by moving the mold is known (for example, see Patent Document 1). However, in the manufacturing method described in Patent Document 1, since the mold is moved or the base material is controlled based on position control information detected by some means, not only the apparatus becomes large, but in reality It was difficult to adjust the optical axis with high accuracy. For this reason, it has been found that it is difficult to achieve both high productivity and high positional accuracy on both sides of the lenticular lens sheet.

  Under such circumstances, development of a method for producing a double-sided lenticular lens sheet capable of achieving both high productivity while maintaining high positional accuracy of the optical axis of the lenticular lens formed on both surfaces of the substrate is desired.

JP 2000-035502 A

  The present invention has been made in view of such a situation, and the object thereof is both sides capable of achieving both high productivity while maintaining high positional accuracy of the optical axis of the lenticular lens formed on both sides of the substrate. It is to provide a method for producing a lenticular lens sheet.

  The above object is achieved by the following configuration.

1. In the method for producing a double-sided lenticular lens sheet in which a mold is pressed against a coating film for lenticular lens formation formed on both sides of a support, and a lenticular shaped lens is molded on both sides.
A guide forming step of forming a guide on at least one side of the support;
A method for producing a double-sided lenticular lens sheet, comprising: aligning the mold with the guide and molding a lenticular lens by molding a lenticular lens.

  2. 2. The method for producing a double-sided lenticular lens sheet according to 1 above, wherein the guide is formed on the lenticular lens-forming coating film.

  3. 3. The method for producing a double-sided lenticular lens sheet according to 1 or 2, wherein the lenticular lens-forming coating film comprises an active energy ray-curable resin.

  4). 3. The method for producing a double-sided lenticular lens sheet according to 1 or 2, wherein the lenticular lens-forming coating film comprises a thermosetting resin.

  It was possible to provide a method for producing a double-sided lenticular lens sheet that can achieve both high productivity while maintaining high positional accuracy on both sides of the lenticular lens sheet.

It is the schematic of the lenticular lens sheet | seat which has a some convex lenticular lens on both surfaces. It is a schematic diagram of a lenticular lens sheet having a plurality of convex lenticular lenses on one side and a plurality of concave lenticular lenses on one side. It is a schematic diagram of the conventional preparation process of the double-sided lenticular lens sheet which uses a strip | belt-shaped base material. It is a schematic diagram of the conventional preparation process of the double-sided lenticular lens sheet which uses a sheet | seat base material. It is the schematic of the metal mold | die for lenticular lens shaping | molding used at the manufacturing process shown in FIG. It is the schematic of the metal mold | die used at the preparation process shown in FIG. It is a schematic diagram of the preparation process of the double-sided lenticular lens sheet of this invention which uses a strip | belt-shaped base material. It is a schematic diagram of the production process of the double-sided lenticular lens sheet of the present invention using a sheet substrate. It is a schematic diagram of the preparation process which forms a guide on both surfaces of this invention using a strip | belt-shaped base material simultaneously, and produces a double-sided lenticular lens sheet. FIG. 8 is a schematic flow diagram illustrating a guide forming method using an active energy ray-curable resin in the manufacturing process illustrated in FIG. 7 and a method of aligning the formed guide and a mold. FIG. 8 is a schematic flow diagram illustrating a guide forming method using a thermosetting resin in the manufacturing process illustrated in FIG. 7 and a method of aligning the formed guide and a mold. 7 schematically shows a method for forming a guide for forming a second lenticular lens on a belt-like base material on which a concave first lenticular lens is formed in the manufacturing process shown in FIG. 7, and a method for aligning the formed guide and the mold. FIG. FIG. 8 is a schematic flow diagram illustrating a method of forming a guide for forming a second lenticular lens and a method of aligning the formed guide and a mold when forming the first lenticular lens in the manufacturing process illustrated in FIG. 7. FIG. 10 is a schematic flow diagram illustrating a method for forming a guide for forming a second lenticular lens and a method for aligning the formed guide and a mold when forming the first lenticular lens in the manufacturing process illustrated in FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 14, but the present invention is not limited thereto.

  A double-sided lenticular lens sheet is a sheet having a plurality of lenticular lenses on both sides of a transparent support. The lenticular lens is a lens in which straight, long, convex or concave lenses are arranged in parallel, and each focal point is connected to a parallel straight line with respect to parallel light. A cross section perpendicular to the length direction of each lens has a cross section similar to that of a spherical lens or an aspheric lens. In addition to these, it is also possible to have a so-called Fresnel lens structure or a diffractive lens structure. An example of a specific double-sided lenticular lens sheet will be described with reference to FIGS.

  FIG. 1 is a schematic view of a lenticular lens sheet having a plurality of convex lenticular lenses on both sides. FIG. 1A is a schematic perspective view of a lenticular lens sheet having a plurality of convex lenticular lenses on both sides. FIG.1 (b) is a schematic sectional drawing in alignment with AA 'of Fig.1 (a).

  In the figure, 1 indicates a double-sided lenticular lens sheet. Reference numeral 101 denotes a transparent substrate, and 102 denotes a convex first lenticular lens formed from a plurality of convex lenticular lenses 102 a formed on the surface of the transparent substrate 101. Reference numeral 103 denotes a convex second lenticular lens formed from a plurality of convex lenticular lenses 103 a formed on the other surface of the transparent substrate 101.

  E indicates the lens thickness on the central axis of the lenticular lens 102a constituting the first lenticular lens 102 from the surface of the transparent substrate 101. The lens thickness E on the central axis can be determined according to the use of the double-sided lenticular lens sheet 1. For example, when used for 3D display, a certain amount of height is required in order to secure the viewing angle. On the other hand, when the lens pitch is large and the height is too high, the shape of the lens itself may adversely affect image viewing. In view of these circumstances, 50 μm to 1000 μm is preferable.

  F indicates the thickness of the transparent substrate 101. The thickness F is preferably 0.001 mm or more and 10 mm or less, and more preferably 0.01 mm or more and 1 mm or less.

  G indicates the lens thickness on the central axis of the lenticular lens 103a constituting the second lenticular lens 103 from the surface of the transparent substrate 101.

  The double-sided lenticular lens sheet shown in this figure can be produced by providing convex lenticular lenses on both surfaces of a base material prepared in advance.

  An example of the design of the double-sided lenticular lens sheet shown in this figure is shown.

  In 3D display, it is necessary to match the pixel pitch with the lens pitch. For example, in a lens sheet used for a display having 460 micron pitch pixels, when a glass having a thickness of 100 μm is used as a transparent substrate and a lenticular lens having a curvature radius of 412.8 μm is provided, a first lenticular lens provided on the substrate is used. The lens thickness is 70 μm.

  FIG. 2 is a schematic view of a lenticular lens sheet having a plurality of convex lenticular lenses on one side and a plurality of concave lenticular lenses on one side. FIG. 1A is a schematic perspective view of a lenticular lens sheet having a plurality of convex lenticular lenses on one side and a plurality of concave lenticular lenses on one side. FIG.1 (b) is a schematic sectional drawing in alignment with BB 'of Fig.1 (a).

  In the figure, 1 'indicates a double-sided lenticular lens sheet. 101 'represents a transparent substrate, and 102' represents a convex first lenticular lens formed from a plurality of convex lenticular lenses 102'a formed on the surface of the transparent substrate 101 '. Reference numeral 103 'denotes a concave second lenticular lens formed from a plurality of concave lenticular lenses 103'a formed on the other surface of the transparent substrate 101'.

  H represents the lens thickness on the central axis of the lenticular lens 102'a constituting the first lenticular lens 102 'from the surface of the transparent substrate 101'. The lens thickness H on the central axis can be determined according to the use of the double-sided lenticular lens sheet 1 ′. For example, when used for 3D display, 50 μm to 1000 μm is preferable for the same reason as E.

  I indicates the thickness of the transparent substrate 101 '. The thickness I is preferably 0.001 mm or more and 10 mm or less, and more preferably 0.01 mm or more and 1 mm or less. It can be determined according to the use of the double-sided lenticular lens sheet 1 ′.

  J indicates the lens thickness on the central axis of the lenticular lens 103'a constituting the second lenticular lens 103 'from the surface of the transparent substrate 101'. The lens thickness G on the central axis can be determined according to the application of the double-sided lenticular lens sheet 1 ′. For example, when used for 3D display, 50 μm to 1000 μm is preferable for the same reason as E.

  The double-sided lenticular lens sheet shown in this figure can be produced by providing a convex lenticular lens on one of both surfaces of a base material prepared in advance and a concave lenticular lens on the other.

  An example of the design of the double-sided lenticular lens sheet shown in this figure is shown.

  When glass having a thickness of 100 μm is used for the transparent substrate and a convex lenticular lens having a curvature radius of 412.8 μm is provided, the thickness of the first lenticular lens is 70 μm. When a convex lenticular lens having a curvature radius of 1322.5 μm is provided, the thickness of the second lenticular lens is 20 μm.

  However, it is preferable that the design of the curvature of these lenses is appropriately changed depending on the distance between the display and the seat and the assumed distance from the viewer.

  In the double-sided lenticular lens sheet 1 shown in FIG. 1 and the double-sided lenticular lens sheet 1 ′ shown in FIG. 2, if the optical axes of the lenticular lens sheets on each surface do not overlap with each other in a direction perpendicular to the surface, aberrations will occur as in a normal lens. Since it becomes large, it is important to align the optical axes of the lenticular lenses on both sides.

  In the double-sided lenticular lens sheet shown in FIGS. 1 and 2, it is preferable to provide a stress relaxation layer between the lenticular lens and the base material in order to suppress the deterioration of the optical characteristics accompanying the curing shrinkage. As the stress relaxation layer, it is preferable to use a resin having a small Young's modulus and hardly generating a stress due to displacement, such as a silicone resin.

  FIG. 3 is a schematic view of a conventional production process of a double-sided lenticular lens sheet using a belt-like substrate. FIG. 3A is a schematic perspective view of a conventional manufacturing process of a double-sided lenticular lens sheet using a belt-like substrate. FIG. 3B is a schematic cross-sectional view of the manufacturing process shown in FIG.

  In the figure, reference numeral 2 denotes a process for producing a double-sided lenticular lens sheet. The production process 2 includes a belt-shaped substrate supply process 2a, a first lenticular lens formation process 2b, a second lenticular lens formation process 2c, and a recovery process 2d.

  The first lenticular lens forming step 2b uses a resin coating device 2b1, a mold 2b2 that is rotatably supported, a pressing roller 2b3, and an active energy ray irradiation device 2b4. The resin coating apparatus 2b1 includes a casting method, a dip method, a bar coater method, a spray method, a blade coating method, a slit die coating method, a gravure coating method, a reverse coating method, a screen printing method, a mold coating method, a printing transfer method, and an ink jet method. And so on. Of these, the slit die method, the gravure method, and the wire bar method are preferable.

  The second lenticular lens forming step 2c uses a resin coating device 2c1, a mold 2c2 that is rotatably supported, a pressing roller 2c3, and an active energy ray irradiation device 2c4. As the resin coating device 2c1, the same resin coating device as the resin coating device 2b1 can be used.

  The collection step 2d uses a cutting device 2d1 and a skeleton winding device 2d2. The cutting device is not particularly limited, and examples thereof include a punching cutting device using an upper blade and a lower blade, a cutting device using a rotary blade, a guillotine blade, and the like. It is possible to select appropriately according to the size, shape, etc. of the double-sided lenticular lens sheet to be finally used. This figure shows the case of a punching and cutting apparatus using an upper blade and a lower blade.

  A method for producing a double-sided lenticular lens sheet using production step 2 will be described.

  The belt-like base material 3 is fed from the supply step 2a to the first lenticular lens forming step 2b by a feeding device (not shown).

  In the first lenticular lens forming step 2b, an active energy ray-curable resin is applied to one surface of the belt-like substrate 3 by the resin coating device 2b1 to form a first lenticular lens-forming coating film.

  After the first lenticular lens-forming coating film is formed, the pressure roller 2b3 is pressed and adhered to the mold 2b2. While the first lenticular lens-forming coating film is in close contact with the mold 2b2, the active energy ray is irradiated by the active energy ray irradiation device 2b4 from the side opposite to the coating surface, and the first lenticular lens-forming coating film is cured, The first lenticular lens is formed on one surface of the strip-shaped substrate 3 by peeling off from the mold 2b2.

  After the first lenticular lens is formed on one surface of the band-shaped substrate 3, the first lenticular lens is formed to form the second lenticular lens on the opposite surface, and the band-shaped substrate 3 is formed in the second lenticular lens forming step 2c. It is conveyed to.

  In the second lenticular lens forming step 2c, a first lenticular lens is formed, and an active energy ray curable resin is applied to the opposite surface of the belt-like substrate 3 by the resin coating device 2c1 to form a second lenticular lens forming coating film. The

  After the second lenticular lens-forming coating film is formed, the pressure roller 2c3 is pressed and adhered to the mold 2c2. While the second lenticular lens-forming coating film is in close contact with the mold 2c2, the active energy ray is irradiated from the side where the first lenticular lens is formed by the active energy ray irradiating device 2c4, and the second lenticular lens-forming coating is applied. The film is cured, peeled off from the mold 2c2, and a second lenticular lens is formed on one surface of the belt-like substrate 3. In addition, since it is necessary to align the mold 2b2 with high accuracy in order to make the optical axes of the first lenticular lens and the second lenticular lens coincide with each other, the mold 2c2 has a position control device (not shown). Therefore, it is necessary to always control the position while the second lenticular lens is formed.

  After the second lenticular lens is formed, the sheet is cut in a cutting step to obtain a required size, and a single-sided double-sided lenticular lens sheet as shown in FIG. 1 or FIG. 2 is produced.

  When the mold used in the first lenticular lens forming step 2b and the second lenticular lens forming step 2c is a convex mold, a concave lenticular lens is formed. When the mold to be used is a concave mold, a convex lenticular lens is formed as the lenticular lens to be formed.

  FIG. 4 is a schematic view of a conventional production process of a double-sided lenticular lens sheet using a sheet substrate.

  In the figure, 2 'indicates a process for producing a double-sided lenticular lens sheet. The production process 2 'includes a sheet base material supply process 2'a, a first resin application process 2'b, a first lenticular lens formation process 2'c, a second resin application process 2'd, and a second lenticular lens. It has a forming step 2'e, a cutting step 2'f, and a collecting step 2'g.

  The supply process 2'a uses a supply device (not shown) that supplies the single-wafer base material 3 'one by one to the first resin application process 2'b.

  In the first resin coating step 2'b, a resin coating device 2'b1 and a mounting table 2'b2 are used. As the resin coating device 2′b1, the same coating method as that of the resin coating device 2b1 (see FIG. 3) can be used.

  In the first lenticular lens forming step 2'c, a mold 2'c1, a mounting table 2'c2, and an active energy ray irradiating device 2'c3, which are arranged to be movable up and down, are used.

  In the second resin coating step 2'd, a resin coating device 2'd1 and a mounting table 2'd2 are used.

  As the resin coating device 2′d1, the same resin coating device as the resin coating device 2′b1 can be used.

  In the second lenticular lens forming step 2'e, a mold 2'e1, a mounting table 2'e2, and an active energy ray irradiating device 2'e3, which are arranged to be movable up and down, are used.

The cutting process 2'f uses a cutting device 2'f1, and cuts to a required size. The cutting device is not particularly limited, and examples thereof include a punching and cutting device using an upper blade and a lower blade, a cutting device using a rotary blade and a guillotine blade, and a cutter using a CO ₂ laser. It is possible to select appropriately according to the size, shape, etc. of the double-sided lenticular lens sheet to be finally used. This figure shows the case of a punching and cutting apparatus using an upper blade and a lower blade.

  The collecting step 2'g uses the cut-out double-sided lenticular lens sheet collection box 2g1, and the cut-out double-sided lenticular lens sheet is collected.

  A method for manufacturing a double-sided lenticular lens sheet using the manufacturing process 2 ′ will be described.

  The sheet substrate 3 'is supplied from the supply step 2'a to the mounting table 2'b2 of the first resin application step 2'b by a supply device (not shown), and the active energy ray curable resin is applied by the application device 2'b1. The first lenticular lens-forming coating film is formed.

  After the active energy ray-curable resin is applied and the first lenticular lens-forming coating film is formed, the first lenticular lens-forming coating film is formed on the mounting table 2'c2 in the first lenticular lens forming step 2'c. It is conveyed with the surface facing up. In the first lenticular lens forming step 2'c, the first lenticular lens forming coating of the single-wafer substrate 3 'placed on the mounting table 2'c2 with the surface on which the first lenticular lens forming coating film is formed facing upward. The mold 2'c1 is pressed and adhered to the surface on which the film is formed. While the mold 2'c1 is in close contact with the first lenticular lens-forming coating film, an active energy ray is applied from the lower side of the mounting table 2'c2 opposite to the surface on which the first lenticular lens-forming coating film is formed. The active energy rays are irradiated by the irradiation device 2'c3, and the first lenticular lens-forming coating film is cured. After the coating film for forming the first lenticular lens is cured, the mold 2'c1 moves upward (in the direction of the arrow in the figure), is peeled off from the mold 2'c1, and is placed on one surface of the sheet substrate 3 '. A first lenticular lens is formed.

  After the first lenticular lens is formed on one surface of the single-wafer substrate 3 ', the first lenticular lens is formed to form the second lenticular lens on the opposite surface, and the single-wafer substrate 3' is formed in the second resin coating step 2 '. Then, the active energy ray-curable resin is applied by the coating device 2'd1 to form a second lenticular lens-forming coating film.

  After the second lenticular lens-forming coating film is formed, the second lenticular lens-forming coating film surface is conveyed to the mounting table 2'e2 in the second lenticular lens forming step 2'e. In the second lenticular lens forming step 2'e, the second lenticular lens forming coating of the sheet substrate 3 'placed on the mounting table 2'e2 with the surface on which the second lenticular lens forming coating film is formed facing upward. The mold 2'e1 is pressed and adhered to the film surface. While the mold 2'e1 is in close contact with the coating film for forming the second lenticular lens, the active energy ray irradiating device 2'e3 starts from the lower side of the mounting table 2'e2 on the surface side where the first lenticular lens is formed. The active energy ray is irradiated to cure the second lenticular lens-forming coating film. After the coating film for forming the second lenticular lens is cured, the mold 2'e1 moves upward (in the direction of the arrow in the figure), is peeled off from the mold 2'e1 and is placed on one surface of the sheet substrate 3 '. A second lenticular lens is formed.

  Note that the mold 2'e1 needs to be aligned with high accuracy in order to make the optical axes of the first lenticular lens and the second lenticular lens coincide with each other, so the mold 2'e1 is a position control device (not shown). The second lenticular lens is formed on the single-wafer substrate 3 'on which the active energy ray-curable resin coating film that forms the second lenticular lens sent from the second resin coating step 2'd is formed. It is necessary to control the position every time.

  After the second lenticular lens is formed, it is cut in a cutting step 2'f to obtain a required size, and a single-sided double-sided lenticular lens sheet as shown in FIG. 1 or FIG. 2 is produced.

  When the mold used in the first lenticular lens forming step 2′c and the second lenticular lens forming step 2′e is a convex mold, a concave lenticular lens is formed. When the mold to be used is a concave mold, a convex lenticular lens is formed as the lenticular lens to be formed.

  The present invention uses a belt-like substrate and a single-wafer substrate in the manufacturing process shown in FIGS. 3 and 4, and aligns the optical axes of the first lenticular lens and the second lenticular lens (not shown). The present invention relates to a method for producing a double-sided lenticular lens sheet having a small aberration obtained by accurately aligning the optical axes of a first lenticular lens and a second lenticular lens without performing high-accuracy alignment.

  FIG. 5 is a schematic view of a cylindrical roll mold used in the production process shown in FIG. FIG. 5A is a schematic perspective view of a cylindrical roll mold for forming a convex lenticular lens. The left side is a schematic cross-sectional view along CC ′. FIG. 5B is a schematic perspective view of a cylindrical roll mold for forming a concave lenticular lens. The left side is a schematic cross-sectional view along DD ′.

  The roll type mold shown in FIG.

  In the drawing, 2b'2 represents a roll mold used in the first lenticular lens forming step 2b and the second lenticular lens forming step 2c shown in FIG. A plurality of concave grooves 2b'21 are provided on the surface of the mold 2b'2. The number, depth, and curvature of the inner surface of the groove 2b'21 can be appropriately determined depending on the number and shape of the first lenticular lens and the second lenticular lens to be molded. A convex lenticular lens is formed by using the roll mold shown in the figure.

  The roll mold shown in FIG.

  In the figure, 2b ″ 2 represents a roll mold used in the first lenticular lens forming step 2b and the second lenticular lens forming step 2c shown in FIG. 3. The surface of the roll mold 2b ″ 2 is convex. A plurality of convex objects 2b ″ 21 are provided. The number, depth, and curvature of the surface of the convex objects 2b ″ 21 are appropriately determined according to the number and shape of the first and second lenticular lenses to be molded. It is possible. A concave lenticular lens is molded by using the roll mold shown in the figure.

  For example, when the roll mold shown in (a) is used in the first lenticular lens forming step 2b and the second lenticular lens forming step 2c shown in FIG. 3, the double-sided lenticular lens sheet shown in FIG. 1 is produced. Moreover, the roll type | mold shown by (a) is used for either the 1st lenticular lens formation process 2b and the 2nd lenticular lens formation process 2c shown in FIG. When a mold is used, a double-sided lenticular lens sheet shown in FIG. 2 is produced.

  The cylindrical roll mold shown in FIGS. 5A and 5B has a built-in heater because the resin forming the first lenticular lens and the second lenticular lens is also used as a thermosetting resin. It doesn't matter if you do.

  In the cylindrical roll mold shown in this figure, it is possible to give a lenticular lens structure by curing a resin applied with an appropriate thickness on a substrate while pressing it on the substrate with an appropriate pressure. It is. In this method, instead of being unable to press the entire body uniformly and strongly, it becomes possible to give a structure continuously and at a relatively high speed.

  When pressing while aligning with a guide, it is preferable to produce a linear guide. With an appropriate speed and pressure, it is possible to select conditions that can give the structure as if the roll rolls on the rail.

  Even in this method, if the shape is given by pressing the roll-shaped molds on both sides at the same time, the function of the guide becomes insufficient, so after creating the shape on one side, give the lens shape on the other side continuously Is preferred. The concept of aligning the mold and the guide itself is the same as the stamper type.

  When manufacturing a lenticular lens at a high speed, the time and labor required to align the molds become a problem. Therefore, it is necessary to design the shape of the guide so that the positioning mechanism is simple.

  When producing a lenticular lens sheet continuously using a roll-shaped mold, it is necessary to control the sheet feeding with a high degree of precision, but the tension on the sheet and the substrate thickness are uniform. Due to the problems such as the property, there is a limit to achieving both high speed and high accuracy only by controlling the transport system. From this point of view, it is considered advantageous to use a guide.

  FIG. 6 is a schematic view of a flat stamper mold used in the manufacturing process shown in FIG. FIG. 6A is a schematic perspective view of a flat stamper mold for forming a convex lenticular lens. The left side is a schematic cross-sectional view along KK ′. FIG. 6B is a schematic perspective view of a flat stamper mold for molding a concave lenticular lens. The left side is a schematic cross-sectional view along LL ′.

  The stamper mold shown in FIG.

  In the figure, reference numeral 2'c'1 denotes a flat stamper mold used in the first lenticular lens forming step 2'c and the second lenticular lens forming step 2'e shown in FIG. A plurality of concave grooves 2'c'12 are provided on the surface of the stamper mold 2'c'1. The number, depth, and curvature of the inner surface of the grooves 2'c'12 can be appropriately determined depending on the number and shape of the first lenticular lens and the second lenticular lens to be molded. By using the mold shown in this figure, a convex lenticular lens is molded.

  The stamper mold shown in FIG.

  In the figure, reference numeral 2'c "1 denotes a flat stamper mold used in the first lenticular lens forming process 2'c and the second lenticular lens forming process 2'e shown in FIG. 4. Stamper mold 2 ' The surface of c ″ 1 is provided with a plurality of convex convex objects 2′c ″ 12. The number, depth, and curvature of the surface of convex objects 2′c ″ 12 are the first lenticular lens to be molded. And it is possible to determine appropriately according to the number and shape of the second lenticular lenses. A concave lenticular lens is molded by using the stamper mold shown in the figure.

  For example, when the stamper mold shown in FIG. 4A is used in the first lenticular lens forming step 2′c and the second lenticular lens forming step 2′e shown in FIG. 4, the double-sided lenticular lens sheet shown in FIG. Produced. Further, the stamper type mold shown in (a) is used in either the first lenticular lens forming step 2′c or the second lenticular lens forming step 2′e shown in FIG. When the stamper mold shown is used, a double-sided lenticular lens sheet shown in FIG. 2 is produced.

  In the stamper mold shown in FIGS. 6A and 6B, since the resin forming the first lenticular lens and the second lenticular lens is also used as a thermosetting resin, a heater is incorporated inside. It doesn't matter.

  In a flat stamper mold, the resin injected into the stamper mold is brought into close contact with the support by pressing and cured as it is to give a lenticular lens structure on the substrate. In this method, since the whole can be pressed uniformly and strongly, it is possible to produce a steep structure using a relatively high viscosity resin.

  When pressing while aligning with a guide, it is difficult to align both sides at the same time, so one side is aligned with a relatively weak pressure, and when the alignment is completed, the pressure is increased and the desired shape is obtained. Add lenticular lens structure. Next, the other side is also pressed by the guide after the stamper mold has been moved to the desired position, and given the desired shape to achieve high-precision alignment along the guide. It is possible to obtain a lens structure.

  The roll mold shown in FIG. 5 and the stamper mold shown in FIG. 6 are manufactured by cutting the surface of the mold base material so as to have an opposite lens shape by cutting using a carbide tool. I can do it. The mold base material does not necessarily need to be a metal, and a glass material such as quartz that transmits light is also applicable as necessary. Based on these molds, those obtained by transferring the shape to a flexible resin material or the like can also be used as the mold. Furthermore, after producing the mold, it is possible to produce a stamper as a copy by performing transfer and electroforming. In addition, all the techniques generally used for mold production are applicable. For example, when a lens shape is imparted to a thermoplastic resin by heat cycle molding, it is also preferable to provide a heat insulating structure in order to reduce the heat capacity of the mold. Also, when using curable resin, in order to reduce adhesion to the mold, a fluorine material is applied to the mold surface to increase its durability, and a slippery protective layer such as diamond-like carbon Giving is preferred.

  As another method for producing the roll mold shown in FIG. 5 and the stamper mold shown in FIG. 6, a metal plate (for example, three types of JIS brass) is processed to form the surface of the mold base material. A fixing method may be used.

  FIG. 7 is a schematic view of a production process of the double-sided lenticular lens sheet of the present invention using a belt-like substrate. Fig.7 (a) is a schematic perspective view of the manufacturing process of the double-sided lenticular lens sheet | seat of this invention which uses a strip | belt-shaped base material. FIG. 7B is a schematic cross-sectional view of the manufacturing process shown in FIG. The production process shown in this figure shows a case where an active energy ray curable resin is used as the material of the lenticular lens. Differences from the conventional manufacturing process shown in FIG. 3 include the following two. 1) A guide forming step 2h is disposed between the coating device and the mold in the second lenticular lens forming step 2c. 2) The alignment of the belt-like substrate having the mold 2c2 and the second lenticular lens-forming coating film in the second lenticular lens forming step 2c is performed by the EPC control mechanism of the belt-like substrate with the end face of the die 2c2 as a reference. However, no more precise control is performed. Since the rest is the same, only the guide forming process will be described, and the description of the other processes will be omitted.

  In the figure, 2h indicates a guide forming step. The guide forming step 2h uses an active energy ray irradiation device 2h1. The active energy ray irradiation device 2h1 is arranged so as to irradiate the second lenticular lens-forming coating film with active energy rays from the side on which the first lenticular lens is formed.

  When the active energy rays are irradiated, the irradiated active energy rays are collected by each first lenticular lens and irradiated to the second lenticular lens-forming coating film. For this reason, the portion irradiated with the active energy ray is cured. After that, when the second lenticular lens-forming coating film is pressed by the mold 2c2 and molded, the cured portion acts as a function of the guide so that the positions of the optical axes of the first lenticular lens and the second lenticular lens It is possible to reduce the aberration by matching.

  Note that the alignment of the optical axis means that a deviation of the optical axis between the first lenticular lens and the second lenticular lens from a position of 100 μm to a half or less of the optical axis pitch is aligned.

A known device can be used as the active energy ray irradiation device 2h1. As a light source for curing the ultraviolet curable resin by a photocuring reaction, any light source that generates ultraviolet light can be used without limitation. For example, UV laser, LED, low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, carbon arc lamp, metal halide lamp, xenon lamp, etc. can be used. The irradiation conditions vary depending on individual lamps, but the amount of light irradiated may if 10000 mJ / cm ² degree from 20 mJ / cm ^2, is preferably a 2000 mJ / cm ² from 50 mJ / cm ^2. In the near-ultraviolet region to the visible light region, it can be efficiently formed by using a sensitizer having an absorption maximum in that region.

  This figure shows a case where an active energy ray curable resin is used. The active energy ray irradiating device 2b4 in the first lenticular lens forming step 2b and the active energy ray irradiating device 2c4 in the second lenticular lens forming step 2c are irradiated with gold. The mold 2b2 and the mold 2c2 are formed from the outside, but the mold 2b2 and the mold 2c2 are made of quartz glass, and an active energy ray irradiation device is provided inside the mold to activate from the inside of the mold. You may make it irradiate an energy ray.

  When a thermosetting resin is used, the active energy ray irradiation device 2b4 in the first lenticular lens formation step 2b, the active energy ray irradiation device 2c4 in the second lenticular lens formation step 2c, and the active energy ray irradiation device 2h1 in the guide formation step 2h are used. This can be done by using a heat application device. It is also possible to provide heat by disposing a heater inside the mold 2b2 and the mold 2c2.

  Although there is no restriction | limiting in particular as a heat provision apparatus used for the 1st lenticular lens formation process 2b and the 2nd lenticular lens formation process 2c, It is preferable to use the method of providing heat with an infrared heater, for example. The heating temperature cannot be generally specified depending on the type of thermosetting resin to be used, but is preferably 30 ° C to 200 ° C, more preferably 50 ° C to 150 ° C, and particularly preferably 90 ° C to 120 ° C.

  Further, as the heat applying device in the guide forming step 2h, a YAG laser irradiation device capable of applying heat locally because a guide is partially formed is preferable.

  The guide formed in the guide forming step 2h shown in the drawing is formed in the direction of transporting the base material in parallel with the first lenticular lens.

  FIG. 8 is a schematic view of a production process of the double-sided lenticular lens sheet of the present invention using a single wafer substrate. The production process shown in this figure shows a case where an active energy ray curable resin is used as the material of the lenticular lens. There are the following two differences from the conventional manufacturing process shown in FIG. 1) A guide formation step 2'h is disposed between the second resin application step 2'd and the second lenticular lens formation step 2'e. 2) The alignment of the mold 2'e1 in the second lenticular lens forming step 2'e and the sheet substrate having the second lenticular lens forming coating is performed by EPC of the sheet substrate based on the end face of the mold 2'e1. The control mechanism does not perform control with higher accuracy than is possible. Since the rest is the same, only the guide forming process will be described, and the description of the other processes will be omitted.

  In the figure, 2'h indicates a guide forming step. The guide forming process 2'h uses an active energy ray irradiation device 2'h1 and a mounting table 2'h2. Fixing means (not shown) is disposed on the mounting table 2'h2, and is fixed with the side on which the first wrench killer lens is formed facing downward. The active energy ray irradiating device 2′h1 is disposed so as to irradiate the active energy ray to the second lenticular lens-forming coating film formed by coating with the resin coating device 2′d1 from the side where the first lenticular lens is formed. Has been. In this figure, the mounting table 2'h2 and the active energy ray irradiation device 2'h1 are separated from each other, but the active energy ray irradiation device may be incorporated in the mounting table 2'h2. . When the active energy rays are irradiated, the irradiated active energy rays are collected by each first lenticular lens and irradiated to the second lenticular lens-forming coating film. For this reason, the portion irradiated with the active energy ray is cured. This hardened part functions as a guide.

  Then, it is conveyed to 2nd lenticular lens formation process 2'e, and is mounted in mounting base 2'e2. At this time, the position of the single-wafer base material on the mounting table 2'e2 is adjusted by an alignment mark (not shown) attached to the single-wafer base material and an alignment mark (not shown) attached to the mounting base 2'e2. When the coating film for forming the second lenticular lens is pressed by the mold 2'e1, the cured portion acts as a guide function so that the optical axes of the first and second lenticular lenses are aligned. Thus, the aberration can be reduced.

  Note that the alignment of the optical axis means that a deviation of the optical axis between the first lenticular lens and the second lenticular lens from a position of 100 μm to a half or less of the optical axis pitch is aligned.

  As the active energy ray irradiation apparatus 2′h1, the same active energy ray irradiation apparatus as the active energy ray irradiation apparatus 2h1 shown in FIG. 7 can be used.

  This figure shows a case where an active energy ray curable resin is used. Active energy ray irradiation device 2'c3 in the first lenticular lens forming step 2'c and active energy ray irradiation in the second lenticular lens forming step 2'e. Irradiation by the apparatus 2'e3 is performed from the outside of the mold 2'c1 and the mold 2'e1, but the mold 2'c1 and the mold 2'e1 are made of quartz glass, and the inside of the mold Alternatively, an active energy ray irradiating device may be provided to irradiate the active energy ray from inside the mold.

  This figure shows a case where an active energy ray curable resin is used. However, when a thermosetting resin is used, the active energy ray irradiating device 2'c3 and the second lenticular lens are formed in the first lenticular lens forming step 2'c. This can be dealt with by using the active energy ray irradiation device 2'e3 in the step 2'h and the active energy ray irradiation device 2'h1 in the guide forming step 2'h as heat application devices. It is also possible to provide heat by disposing a heater inside the mold 2'c1 and the mold 2'e1.

  As the heat application device, the same heat application device as that shown in FIG. 7 can be used. Further, as the heat application device in the guide forming step 2′h, a YAG laser irradiation device capable of applying heat locally because a guide is partially formed is preferable.

  In this figure, the mold 2'c1 used in the first lenticular lens forming step 2'c and the mold 2'e1 used in the second lenticular lens forming step 2'e are flat stamper types shown in FIG. Shows the case of mold. It is also possible to use a roll mold shown in FIG. The guide formed in the guide forming step 2′h shown in the drawing is formed in parallel with the first lenticular lens.

  FIG. 9 is a schematic view of a production process for producing a double-sided lenticular lens sheet by simultaneously forming guides on both sides of the present invention using a belt-like substrate. FIG. 9A is a schematic perspective view of a production process in which a guide is simultaneously formed on both sides of the present invention using a band-shaped substrate to produce a double-sided lenticular lens sheet. FIG. 9B is a schematic cross-sectional view of the manufacturing process shown in FIG.

  In the figure, 2 "indicates a production process of the double-sided lenticular lens sheet. The production process 2" includes a belt-like substrate supply process 2 "a, a first application process 2" b, a second application process 2 "c, It includes a guide forming step 2 "d, a first lenticular lens forming step 2" e, a second lenticular lens forming step 2 "f, and a recovery step 2" g.

  The supply process 2 ″ a uses a feeding device (not shown), and the belt-like substrate 3 ″ is conveyed from the supply process 2 ″ a to the first coating process 2 ″ b.

  In the first coating step 2 ″ b, a resin coating device 2 ″ b1 and a backup roll 2 ″ b2 holding the strip-shaped substrate 3 ″ are used.

  The second coating process 2 ″ c uses a resin coating device 2 ″ c1. The resin coating apparatus 2 ″ b1 and the resin coating apparatus 2 ″ c1 include a casting method, a dip method, a bar coater method, a spray method, a blade coating method, a slit die coating method, a gravure coating method, a reverse coating method, a screen printing method, and a mold. Examples thereof include a coating method, a printing transfer method, and an ink jet method. Of these, the slit die method, the gravure method, and the wire bar method are preferable.

  An active energy ray-curable resin is used as the first lenticular lens forming resin and the second lenticular lens forming resin. In addition, a photopolymerization initiator that is cured by both ultraviolet rays and visible light is added to the first lenticular lens-forming resin, and a photopolymerization initiator that is cured by ultraviolet rays is added to the second lenticular lens-forming resin. .

  In the guide forming step 2 ″ d, a UV laser irradiation device 2 ″ d1 is used as an active energy ray irradiation device.

  In the first lenticular lens forming step 2 "e, a mold 2" e1 rotatably supported and an active energy ray irradiation device 2 "e2 are used.

  In the second lenticular lens forming step 2 ″ f, a mold 2 ″ f1 rotatably supported and an active energy ray irradiation device 2 ″ f2 are used. The mold 2 ″ e1 and the mold are used. Since it is necessary to align 2 ″ f1 with the belt-like substrate 3 ″ on which the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are formed, the mold 2 ″ e1 The mold 2 ″ f1 has a position control device (not shown), and it is necessary to always control the position while the first lenticular lens and the second lenticular lens are being molded.

  In the collecting step 2 ″ g, a cutting device 2 ″ g1 and a skeleton winding device 2 ″ g2 are used. There is no particular limitation on the cutting device, for example, punch cutting using an upper blade and a lower blade. Examples include an apparatus, a rotary blade, a cutting device using a guillotine blade, etc. It can be appropriately selected according to the size, shape, etc. of the double-sided lenticular lens sheet to be finally used. The case of the punching and cutting apparatus using a blade is shown.

  A method for producing a double-sided lenticular lens sheet using production step 2 ″ will be described.

  The belt-like base material 3 ″ is fed from the feeding process 2 ″ a to the first lenticular lens forming process 2 b by a feeding device (not shown).

  In the first coating step 2 "b, the first lenticular lens-forming resin is continuously applied to one surface of the belt-like substrate 3" by the resin coating device 2 "b1 to form the first lenticular lens-forming coating film. .

  In the second coating step 2 ″ c, the second lenticular lens-forming resin is continuously applied to the opposite surface on which the first lenticular lens-forming coating film is formed to form the second lenticular lens-forming coating film. The

  In the guide forming step 2 ″ d, a UV laser is irradiated from the UV laser irradiation apparatus 2 ″ d1 as an active energy ray that simultaneously cures the first lenticular lens-forming coating film and the second lenticular lens-forming coating film. In this figure, the irradiated portion is cured by irradiating the UV laser to a predetermined position, and the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are simultaneously guided to the same position. Is formed.

  In the first lenticular lens forming step 2 "e, the belt-like substrate 3" on which the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are formed is pressed against the mold 2 "e1 by the conveying tension. When the belt-like substrate 3 ″ is pressed against the mold 2 ″ e1 by the conveying tension, the belt-like substrate 3 ″ moves along the guide formed on the first lenticular lens-forming coating film. The first lenticular lens is molded by aligning the coating film for forming the lenticular lens and the mold 2 ″ e1.

  In the case of this figure, since the first lenticular lens-forming coating film contains a photopolymerization initiator that cures by both ultraviolet rays and visible light, visible light is irradiated from the active energy ray irradiation device 2 ″ e2. Visible light also irradiates the second lenticular lens-forming coating film, but a curing reaction does not occur because the second lenticular lens-forming coating film contains a photopolymerization initiator that is cured by ultraviolet rays.

  In the second lenticular lens forming step 2 "f, the belt-like substrate 3" on which the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are formed is pressed against the mold 2 "f1 by the conveying tension. When the belt-like substrate 3 ″ is pressed against the mold 2 ″ f1 by the conveyance tension, the belt-like substrate 3 ″ moves along the guide formed on the second lenticular lens-forming coating film, so that the second The lenticular lens-forming coating film and the mold 2 ″ f1 are aligned to form the second lenticular lens.

  It should be noted that a member having good slipperiness is disposed on the surfaces of the mold 2 "e1 and the mold 2" f1 (surfaces in contact with the first lenticular lens-forming coating film and the second lenticular lens-forming coating film). Is preferred. The member having good slipperiness is a material having a low friction coefficient, and examples thereof include olefin-based resins and halogen-based resins. In particular, a fluorine-based resin material is preferable.

  In the case of this figure, since the photopolymerization initiator which hardens | cures only with an ultraviolet-ray is put in the coating film for 2nd lenticular lens formation, an ultraviolet-ray is irradiated from active energy ray irradiation apparatus 2 "f2.

  The mold 2 ″ e1 and the mold 2 ″ f1 are molds having the same shape, and the guides provided on the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are in the same position. A double-sided lenticular lens sheet in which the optical axes of the molded first lenticular lens and second lenticular lens coincide with each other is produced.

  In the collecting step 2 ″ g, after the first lenticular lens and the second lenticular lens are formed, the sheet is cut to the size required by the cutting device 2 ″ g1 in order to obtain the required size. A single-sided double-sided lenticular lens sheet as shown in FIG.

  When the molds used in the first lenticular lens forming step 2 "e and the second lenticular lens forming step 2" fe are convex, a concave lenticular lens is formed as the lenticular lens to be formed. When the mold to be used is a concave mold, a convex lenticular lens is formed as the lenticular lens to be formed.

  FIGS. 7 to 9 show a method of forming a guide by using an active energy ray curable resin and irradiating active energy ray irradiation, but the guide forming method is not particularly limited, and a double-sided lenticular lens sheet to be produced It is possible to appropriately change depending on the type of the resin material and the type of resin material used. A method for forming the guide will be described below.

  The guide forming method is divided into a method of forming on one side and a method of forming on both sides simultaneously.

An example of a method for forming the guide on one side is shown below.
A) A first lenticular lens formed on one side is used to produce a guide for forming a second lenticular lens.
B) A guide is formed for forming the second lenticular lens when forming the first lenticular lens.

A. A specific method for producing a guide for forming the second lenticular lens using the first lenticular lens formed on one side will be described.
1. After forming the first lenticular lens on one side of the substrate, an active energy ray-curable resin coating is formed on the other side. Thereafter, the active energy ray is irradiated from the surface on which the first lenticular lens is formed to partially cure the active energy ray-curable resin coating, and the cured portion is used as a guide. After the first lenticular lens is formed on one side of the substrate, a thermosetting resin coating film is formed on the other side. Thereafter, a method in which the heat-cured resin coating is partially applied by applying heat energy to the surface on which the thermosetting resin coating is formed in accordance with the formation position of the first lenticular lens, and the cured portion is used as a guide. B. A specific method for producing a guide for forming the second lenticular lens when forming the first lenticular lens will be described.

1) A first lenticular lens is formed by pressing a die after forming a first lenticular lens-forming resin coating in advance by providing a notch penetrating the substrate at a position where the first lenticular lens of the substrate is formed. A method of forming a guide by extruding a resin from a cut portion and curing the extruded resin at the time of performing an example is shown below.

  C. A specific method for setting the positions for forming the first lenticular lens and the second lenticular lens on the base material in advance and simultaneously producing the guide on both sides of the base material will be described.

In the method of manufacturing both sides simultaneously, there are 1) mechanical, 2) thermal, and 3) optical methods.
1) In the method of mechanically producing, for example, a blade-like or needle-like jig is pressed against a thermoplastic resin base material, and unevenness is simultaneously provided on the upper and lower sides of the support. Alternatively, this technique also includes preparations in which a part of the base material is processed and a guide can be simultaneously produced on both sides in the next step. When pressing a mold into a concave portion on one side, a convex portion corresponding to the concave portion is provided in the mold, and a concave portion corresponding to the convex portion is provided in the mold on the convex portion on the other side, so that the accuracy is high. It becomes possible to provide a guide for alignment.
2) As a thermal method, there is a method of providing unevenness due to melting at the front and back positions of the support using a YAG laser or the like. Similar to the guide provided by the mechanical method, by providing the corresponding unevenness in the mold, it is expected that the alignment accuracy by the guide is improved.
3) As an optical method, preparation of a guide using a UV-cured resin front and back simultaneous cured product can be mentioned. A UV curable resin is applied to both surfaces of the base material, and is cured by partially irradiating a thin line with a laser from one surface to a position where a lenticular lens is formed.

  As described above, any of the above-described method of forming the guide on one side and the method of forming both sides simultaneously can be appropriately selected and used as necessary. A method of forming a guide on one side based on the lenticular lens structure after manufacturing the lenticular lens is preferable from the viewpoints of productivity and guide manufacturing accuracy.

  FIGS. 10 to 13 show specific guide forming methods 1 to 3 and a method for aligning the formed guide and the mold. In addition, the manufacturing method of FIG. 7 using the strip | belt-shaped base material which uses the same method of alignment with the guide formed in the strip | belt-shaped base material and the sheet | seat base material, and a metal mold | die is shown as a representative.

  In addition, although it is repeated, the present invention is a method for producing a double-sided lenticular lens sheet in which a mold is pressed against a coating film for lenticular lens formation formed on both sides of a support, and a lenticular shaped lens is molded on both sides. A double-sided feature comprising: a guide-forming step for forming a guide on at least one side of the support; and a lenticular-shaped lens forming step for aligning the mold with the guide and forming a lenticular-shaped lens. This is a method for producing a lenticular lens sheet.

  As shown in FIGS. 7 to 14, the method for producing a double-sided lenticular lens sheet according to the present invention includes a first lenticular lens and a first lenticular lens formed by pressing a mold against a lenticular lens forming position of a lenticular lens forming coating film. In order to align the optical axis with the lenticular lens, it is preferable to move the mold relatively along a guide provided in advance on the lenticular lens-forming coating film to align the mold.

  That is, there are two methods for aligning the mold with the guide referred to in the present application. One is a guide in which a lenticular lens-forming coating film is cured on the opposite side of the belt-like substrate using a lenticular lens already formed on the belt-like substrate, and a mold is aligned by this guide. Is the method. As another method, a lenticular lens formed by applying an active energy ray curable resin to the opposite side of the belt-shaped substrate by performing laser exposure at a certain position corresponding to the optical axis on the one side as a standard. In this method, the coating film for formation is cured and used as a guide, and the position of the mold is aligned by this guide.

  Further, FIGS. 10 to 12 show a method of aligning the mold with a specific guide.

  FIG. 10 is a schematic flow diagram showing a guide forming method using an active energy ray-curable resin in the manufacturing process shown in FIG. 7 and a method of aligning the formed guide and the mold. The case where a metal halide lamp is used as the active energy ray is shown.

  Step 1 shows a state in which the guide 5a is formed. The guide 5a is formed as follows. In the first lenticular lens forming step 2b (see FIG. 7), the resin coating apparatus 2c1 (see FIG. 7) is formed on the surface of the belt-like substrate 3 on which the first lenticular lens 4 is formed, which faces the surface on which the first lenticular lens 4 is formed. 7), a second lenticular lens-forming coating solution (also serving as a guide-forming coating solution) is applied to form a second lenticular lens-forming coating film 5 (also serving as a guide-forming coating film). Thereafter, an active energy ray is irradiated (arrow C ′ in the figure) from the first lenticular lens 4 surface side by the active energy ray irradiation device 2h1 (see FIG. 7). The irradiated active energy rays are condensed by each first lenticular lens 4 and irradiated with a second lenticular lens-forming coating film (also serving as a guide-forming coating film). Thereby, only the part irradiated with the active energy ray is cured. In the case of this figure, the cross-sectional shape is a convex object having an elliptical shape. The hardened part functions as the guide 5a. In addition, the part which was not irradiated with an active energy ray remains in the state which is not hardened | cured.

  In step 2, the second lenticular lens-forming coating film 5 with the guide 5a formed thereon is molded into the second lenticular lens by the mold 2c2 in the second lenticular lens forming step 2c (see FIG. 7). 2 shows a state where the center R of the concave portion of the mold 2c2 for molding the lenticular lens 5b and the vertex S of the guide 5a do not coincide with each other. The initial position of the mold 2c2 is set to the position of the first lenticular lens by an EPC control device provided in the second lenticular lens forming step and an alignment mark provided in advance on the belt-like substrate on which the first lenticular lens is formed. In general, the guide 5a is preferably used for highly accurate alignment. In the 2nd lenticular lens formation process 2c (refer FIG. 7), the strip | belt-shaped base material 3 is pressed to the metal mold | die 2c2 (refer FIG. 7) side by the press roller 2c3 (refer FIG. 7). By pressing, the vertex S of the guide 5a once comes into contact with the surface of the recessed portion that is out of the center R of the recessed portion of the mold 2c2. Further, by pushing, the apex S of the guide 5a moves toward the center R along the surface in contact with the concave surface of the mold 2c2 (the belt-like base material 3 moves (in the direction of the arrow X in the figure)). The center R of the recess of the mold 2c2 and the apex S of the guide 5a are automatically adjusted to coincide with each other, and the surface of the pressing roller 2c3 (see FIG. 7) has slipperiness. It is preferable to dispose a good member, such as a material having a low friction coefficient, such as an olefin resin, a halogen resin, etc. In particular, a fluorine resin material. Is preferred.

  Step 3 shows a state where the center R of the concave portion of the mold 2c2 (see FIG. 7) and the vertex S of the guide 5a coincide. In this state, the active energy ray irradiation device 2c4 (see FIG. 7) irradiates the active energy ray, whereby the second lenticular lens-forming coating film 5 is cured and integrated with the guide 5a to form the second lenticular lens 5b. . The vertex S of the guide 5a is the vertex of the second lenticular lens 5b.

  Step 4 shows a state in which the belt-like base material 3 on which the first lenticular lens 4 and the second lenticular lens 5b are formed is separated from the mold 2c2 (see FIG. 7). Since the optical axes of the first lenticular lens 4 and the second lenticular lens 5b coincide with each other, a double-sided lenticular lens sheet having a shape shown in FIG.

  FIG. 11 is a schematic flow diagram showing a guide forming method using a thermosetting resin in the manufacturing process shown in FIG. 7 and a method of aligning the formed guide and the mold. In addition, when using thermosetting resin, it can respond by changing the active energy ray irradiation apparatus of the preparation process shown in FIG. 7 to a heat application apparatus. In addition, before applying the second lenticular lens forming coating solution in the second lenticular lens forming step 2c, a heat absorbing layer forming step of forming a heat absorbing layer by applying an infrared absorbing dye to improve heat absorption efficiency ( (Not shown) is preferably provided.

  Step 1 shows a state in which two guides 8a and 8b are formed for one first lenticular lens. The guide 8a and the guide 8b are at the same distance from the vertex U of the first lenticular lens 6, and the guide 8a and the guide 8b have the same height.

  The guide 8a and guide 8b are formed as follows. In the first lenticular lens forming step 2b (see FIG. 7), a heat absorbing layer forming step (on the surface of the belt-like substrate 3 on which the first lenticular lens 6 is formed is opposed to the surface on which the first lenticular lens 6 is formed ( Infrared absorbing dye is applied in (not shown) to form a heat absorbing layer (for example, a tin sol layer) 7. Thereafter, a second lenticular lens-forming coating solution (also serving as a guide-forming coating solution) composed of a thermosetting resin is applied by the resin coating device 2c1 (see FIG. 7), and the second lenticular lens-forming coating film is applied. 8 (also serving as a guide-forming coating film) is formed. After that, the YAG laser is irradiated from the heat applying device onto the surface of the second lenticular lens-forming coating film 8 side at positions corresponding to the same two locations of each first lenticular lens 6 (M arrow in the figure). Thereby, only the portion irradiated with the YAG laser is cured. In the case of this figure, the cross-sectional shape is a columnar convex object. The hardened part functions as a guide 8a and a guide 8b. The portion that was not irradiated with the YAG laser remains uncured. The YAG exposure is absorbed by the infrared dye (heat absorption layer), generates heat, cures the thermosetting resin, and does not cause photocuring of the resin.

  In step 2, the second lenticular lens-forming coating film 8 with the guides 8a and 8b formed thereon is molded into the second lenticular lens 8c by the mold 2c2 in the second lenticular lens forming step 2c (see FIG. 7). 2 shows a state where the center T of the concave portion of the mold 2c2 for molding the second lenticular lens 8c and the apex U of the first lenticular lens 6 do not coincide with each other. The initial position of the mold 2c2 is set to the position of the first lenticular lens by an EPC control device provided in the second lenticular lens forming step and an alignment mark provided in advance on the belt-like substrate on which the first lenticular lens is formed. In general, the guides 8a and 8b are preferably used for highly accurate positioning. In this case, one of the guide 8a and the guide 8b is in contact with the inner surface of the mold 2c2. In this figure, the guide 8a is in contact with the inner surface of the mold 2c2. In the 2nd lenticular lens formation process 2c (refer FIG. 7), the strip | belt-shaped base material 3 is pressed to the metal mold | die 2c2 (refer FIG. 7) side by the press roller 2c3 (refer FIG. 7). By pressing, the end of the top surface V of the guide 8a is in contact with the concave surface of the mold 2c2, and the end of the top surface of the guide 8a and the guide 8b is simultaneously aligned with the surface toward the center T. It moves to the position where it abuts against the surface of the concave portion 2c2 (the belt-like base material 3 moves in the direction of arrow N). In this state, the center T of the concave portion of the mold 2c2 and the vertex U of the first lenticular lens 6 coincide. In addition, it is preferable to arrange | position the member with favorable slipperiness | liquidity on the surface of the press roller 2c3 (refer FIG. 7).

  In step 3, the center T of the recess of the mold 2c2 (see FIG. 7) and the apex U of the first lenticular lens 6 coincide (the apexes of the guide 8a and the guide 8b are the recesses of the mold 2c2 (see FIG. 7)). The state which contact | abutted to the inner surface) is shown. In this state, the second lenticular lens-forming coating film 8 is cured and integrated with the guide 8a and the guide 8b by applying heat with a heat applying apparatus (an apparatus replacing the active energy ray irradiation apparatus 2c4 shown in FIG. 7). A 2 lenticular lens 8c is formed.

  Step 4 shows a state in which the belt-like substrate 3 on which the first lenticular lens 6 and the second lenticular lens 8c are formed is separated from the mold 2c2 (see FIG. 7). Since the optical axes of the first lenticular lens 6 and the second lenticular lens 8c coincide with each other, a double-sided lenticular lens sheet having a shape shown in FIG.

  The YAG laser method shown in the figure shows that when the resin used is an active energy ray curable resin, the heat application device is changed to an active energy ray irradiation device, and the guide-formed YAG laser is changed to a UV laser. Can be applied. However, in this case, the step of forming the heat absorption layer is not necessary.

  FIG. 12 shows a method for forming a guide for forming a second lenticular lens on a belt-like base material on which a concave first lenticular lens is formed in the manufacturing process shown in FIG. 7, and a method for aligning the formed guide and the mold. FIG. In addition, active energy ray hardening resin is used for the material of a 1st lenticular lens and a 2nd lenticular lens, and the case where a metal halide lamp is used as an active energy ray is shown.

  Step 1 shows a state in which the guide 5'a is formed. The guide 5'a is formed as follows. In the first lenticular lens forming step 2b (see FIG. 7), a resin is formed on the surface of the band-shaped substrate 3 ′ on which the concave first lenticular lens 4 ′ is formed, which faces the surface on which the first lenticular lens 4 ′ is formed. A second lenticular lens-forming coating solution (also serving as a guide-forming coating solution) is applied by the coating device 2c1 (see FIG. 7), and a second lenticular lens-forming coating film 5 '(also serving as a guide-forming coating film) is applied. It is formed. Thereafter, an active energy ray is irradiated (arrow C ″ in the figure) from the first lenticular lens 4 ′ surface side by the active energy ray irradiating device 2h1 (see FIG. 7). The light is condensed by the lenticular lens 4 'and irradiated with the second lenticular lens-forming coating film (also serving as the guide-forming coating film), so that only the portion irradiated with the active energy ray is cured. The hardened part functions as the guide 5'a, and the part not irradiated with the active energy ray remains uncured.

  In step 2, the second lenticular lens-forming coating film 5 'on which the guide 5'a is formed is formed into a second lenticular lens by the mold 2c2 in the second lenticular lens forming step 2c (see FIG. 7). At this time, the center Y of the concave portion of the mold 2c2 for molding the second lenticular lens 5'c and the apex W of the guide 5'a do not coincide with each other. The initial position of the mold 2c2 is set to the position of the first lenticular lens by an EPC control device provided in the second lenticular lens forming step and an alignment mark provided in advance on the belt-like substrate on which the first lenticular lens is formed. In general, the guide 5'a is preferably used for highly accurate alignment. In the 2nd lenticular lens formation process 2c (refer FIG. 7), the strip | belt-shaped base material 3 is pressed to the metal mold | die 2c2 (refer FIG. 7) side by the press roller 2c3 (refer FIG. 7). By pressing, the vertex W of the guide 5'a once comes into contact with the center of the recess Y of the mold 2c2 and the surface of the recessed recess. Further, by pushing, the apex W of the guide 5'a moves toward the center Y along the surface in contact with the concave surface of the mold 2c2 (the band-shaped base material 3 moves (G arrow in the figure)). The center Y of the concave portion of the mold 2c2 and the apex W of the guide 5a coincide with each other, and a member having good slipperiness is disposed on the surface of the pressing roller 2c3 (see FIG. 7). The member having good sliding property is a material having a low friction coefficient, and examples thereof include olefin-based resins, halogen-based resins, etc. In particular, fluorine-based resin materials are preferable.

  Step 3 shows a state in which the center Y of the concave portion of the mold 2c2 (see FIG. 7) and the vertex W of the guide 5'a coincide. In this state, the active energy ray irradiating apparatus 2c4 (see FIG. 7) irradiates the active energy ray, whereby the second lenticular lens-forming coating film 5 'is cured and integrated with the guide 5'a, and the second lenticular lens 5'. b is formed. The vertex W of the guide 5'a is the vertex of the second lenticular lens 5'b.

  Step 4 shows a state in which the belt-like substrate 3 on which the first lenticular lens 4 ′ and the second lenticular lens 5′c are formed is separated from the mold 2c2 (see FIG. 7). Since the optical axes of the first lenticular lens 4 'and the second lenticular lens 5'c coincide with each other, a double-sided lenticular lens sheet having a shape shown in FIG.

  Further, as a method for forming a guide, a notch penetrating the belt-like substrate is provided at a position corresponding to the optical axis at a position where the lenticular lens of the belt-like substrate is formed, using the optical axis of the lenticular lens as a reference. By pressing a lenticular lens-forming coating film formed by applying an active energy ray-curable resin on one of the band-shaped substrates provided with this notch with the mold, it is combined with the formation of the lenticular lens and the opposite of the band-shaped substrate through the notch. Active energy ray curable resin oozes out to the side. This is a method in which the exuded active energy ray curable resin is cured to serve as a guide, and the mold is aligned by this guide. FIG. 13 shows a method for aligning the mold with a specific guide.

  FIG. 13 is a schematic flow diagram showing a method of forming a guide for forming the second lenticular lens and a method of aligning the formed guide and the mold when forming the first lenticular lens in the manufacturing process shown in FIG. .

  Step 1 shows the state of the strip-shaped substrate 3 in which the cuts 3a are provided in advance at the position where the first lenticular lens is formed. In the case of this figure, the number of the notches 3a shows the case where two places are provided for each first lenticular lens. The position of the notch 3a is provided so as to be the same distance from the apex of each first lenticular lens. The means for making the cut 3a in the belt-like substrate is not particularly limited, and examples thereof include a dicing saw.

  Step 2 shows a state in which the first lenticular lens forming coating 4a is formed by applying the first lenticular lens forming coating solution in the first lenticular lens forming step 2b (see FIG. 7).

  Step 3 shows a state where the first lenticular lens 4 and the guide 9 are formed by pressing and closely contacting the mold 2b2 (see FIG. 7) in the first lenticular lens forming step 2b (see FIG. 7). The guide 9 has a cut in which a part of the first lenticular lens-forming coating film 4a is provided on the belt-shaped substrate 3 when the first lenticular lens-forming coating film 4a is pressed by the mold 2b2 (see FIG. 7). It is formed by being extruded from 3a.

  In step 4, the second lenticular lens-forming coating solution is applied to the side on which the guide 9 is formed by the resin coating device 2c1 (see FIG. 7) of the second lenticular lens-forming step 2c. The state in which 9a is formed is shown.

  Subsequent alignment of the guide 9 and the mold for forming the second lenticular lens is the same as that after step 1 in FIG.

  Furthermore, as a method for forming a guide, an active energy ray curable resin is applied to both surfaces of a belt-like substrate to form a lenticular lens-forming coating film. At the position where the lenticular lens of the lenticular lens-forming coating film is formed, the guide is cured by irradiating active energy rays one side at a certain position corresponding to the optical axis with the optical axis of the lenticular lens as a reference. To do. This is a method of aligning the mold with this guide. FIG. 14 shows a method for aligning the mold with a specific guide.

  FIG. 14 is a schematic flow diagram showing a guide forming method using an active energy ray curable resin in the manufacturing process shown in FIG. 9 and a method for aligning the formed guide and the mold.

  Step 1 is a first lenticular lens-forming coating film 4 ″ a (guide) formed by applying a first lenticular lens-forming resin on the base material 3 ″ in the first application step 2 ″ b (see FIG. 9). And a second lenticular lens-forming coating film 4 ″ b (for guide formation) formed by applying a second lenticular lens-forming resin in the second coating step 2 ″ c (see FIG. 9). A state in which a film is also formed).

  The first lenticular lens-forming coating film contains a photopolymerization initiator that cures by either ultraviolet light or visible light. The second lenticular lens-forming coating film contains a photopolymerization initiator that is cured by ultraviolet rays.

  In step 2, the portion irradiated with the UV laser from the surface of the first lenticular lens-forming coating film 4 ″ a in the guide forming step 2 ″ d (see FIG. 9) (the hatched portion in the drawing) Cured and two guides 4 ″ a1, guide 4 ″ a2 are formed for one first lenticular lens, and two guides 4 ″ b1 and guide 4 ″ b2 are formed for one second lenticular lens. Show. In the case of this figure, the cross-sectional shape is a columnar convex object. Note that the portion not irradiated with the UV laser remains uncured. The UV irradiating from the first lenticular lens-forming coating film 4 ″ a side passes through the substrate 3 ″, and the second lenticular lens-forming coating film 4 ″ b side is also irradiated to irradiate the first lenticular lens. The same portion as the lens-forming coating film 4 ″ a is cured to form a guide. The guide 4 ″ a1 and the guide 4 ″ a2 are at the same distance from the vertex X ′ of the first lenticular lens 5 ″ a formed by the mold 2 ″ e1, and the guide 4 ″ a1 and the guide 4 ″ a2 are the same height. It has become.

  The guide 4 ″ b1 and the guide 4 ″ ba2 are at the same distance from the vertex Y of the second lenticular lens 5 ″ b molded by the mold 2 ″ f1, and the guide 4 ″ b1 and the guide 4 ″ ba2 have the same height. It has become.

  In step 3, the first lenticular lens-forming coating film guide 4 ″ a in the state in which the guide 4 ″ a1 and the guide 4 ″ a2 are formed is the mold 2 in the first lenticular lens forming step 2 ″ e (see FIG. 9). When the first lenticular lens 5 "a is formed by molding" e1 "(see FIG. 9), the center P of the concave portion of the mold 2" e1 and the intermediate between the guide 4 "a1 and the guide 4" a2 This indicates a state in which the point Q does not match. The initial position of the mold 2 ″ e1 is the EPC control device provided in the first lenticular lens forming step and the first lenticular lens forming coating 4 ″ a. And the second lenticular lens forming coating film 4 ″ b and the formed base material 3 ″ with the alignment mark or the like provided in advance to roughly match the position where the first lenticular lens is formed, and the guide 4 ″ a1 and guide 4 ″ a2 Is It is preferred to use the positioning accuracy. In this case, guide 4 "a1, guide 4" any one-way of a2 is the inner surface of the mold 2 "e1 has a contact state. In this figure, the end of the top surface Z of the guide 4 ″ a1 is in contact with the inner surface of the mold 2 ″ e1.

  Step 4 shows a state in which, in the first lenticular lens forming step 2 ″ e (see FIG. 9), the base material 3 ″ is pressed to the mold 2 ″ e1 side by the tension due to the conveyance tension. The apex R of the guide 4 ″ a1 is in contact with the concave surface of the mold 2 ″ e1 toward the center P along the surface, and the apexes of the guide 4 ″ a1 and the guide 4 ″ a2 are simultaneously aligned with the mold 2 "The base material 3" moves in the direction of arrow O to a position where it comes into contact with the surface of the concave portion of e1. By moving, the center P of the concave portion of the mold 2 "e1 and the guide 4" a1 and guide 4 ". The intermediate point Q between a2 and a2. In addition, it is preferable to dispose a member having good slipperiness on the surface of the pressing roller 2c3 (see FIG. 7) of the mold 2 ″ e1.

  In step 4, the center P of the recess of the mold 2 ″ e1 coincides with the intermediate point Q between the guide 4 ″ a1 and the guide 4 ″ a2 (on the top surface Z of the guide 4 ″ a1 and the guide 4 ″ a2). The end is in contact with the inner surface of the recess of the mold 2 ″ e1), and the first lenticular lens coating film 4 ″ a is molded with the mold 2 ″ e1. At this time, the first lenticular lens forming coating film 4 ″ a is cured by irradiation with visible light from the active energy ray irradiation device 2 ″ e2 (see FIG. 9), and the guide 4 ″ a1 and the guide 4 ″ a The base material 3 ″ is peeled off from the mold 2 ″ e1 and the first lenticular lens 5 ″ a is formed as the base material 3 ″ is conveyed to the second lenticular lens forming step 2 ″ f.

  Further, the base material 3 ″ having the first lenticular lens 5 ″ a and the second lenticular lens forming coating 4 ″ b is conveyed to the second lenticular lens forming step 2 ″ f (see FIG. 9). In the second lenticular lens forming step 2 ″ f (see FIG. 9), the second lenticular lens 5 ″ b is formed through the same process as Step 3 and Step 4. However, when the coating film 4 ″ b for forming the second lenticular lens is molded by the mold 2 ″ f1 (see FIG. 9), ultraviolet rays are irradiated from the active energy ray irradiation device 2 ″ f2 (see FIG. 9).

  In step 5, the base material on which the first lenticular lens 5 ″ a and the second lenticular lens 5 ″ b are formed from the mold 2 ″ e1 (see FIG. 9) and the mold 2 ″ f1 (see FIG. 9). 3 ″ indicates a separated state. Since the first lenticular lens 5 ″ a and the second lenticular lens 5 ″ b have the same guide position and the same mold shape, their optical axes coincide with each other. Therefore, a double-sided lenticular lens sheet having a shape shown in FIG.

  The guides shown in FIGS. 10 to 14 are preferably produced so as to be parallel to the long axis of the lenticular lens. Further, the guide may have a dot shape or a linear shape as long as it corresponds to the concave portion of the mold, but a linear shape is preferable because the function of adjusting the positional relationship of the mold is more strongly expressed.

The following effects can be obtained by the method for producing a double-sided lenticular lens sheet of the present invention shown in FIGS.
1. The optical axes of the first lenticular lens and the second lenticular lens can be accurately aligned, and a high-quality double-sided lenticular lens sheet can be produced.
2. Since the optical axis of the other lenticular lens is aligned with the optical axis of one lenticular lens, it is not necessary to align the mold with high precision, and the control mechanism for the alignment of the mold can be simplified.
3. High-precision alignment of molds is no longer necessary, and time is not required for alignment and productivity can be improved.

  Next, materials related to the method for producing the double-sided lenticular lens sheet of the present invention will be described.

(Base material)
Any known material can be used as long as it is transparent. Examples of the resin include films of polyester resin, cellulose acetate resin, acrylic resin, polycarbonate resin, polyvinyl chloride resin, polyimide resin, cellophane, and celluloid. In addition to the resin, a glass plate, a glass film, and a hybrid material of glass and resin can also be used.

  In recent years, a thin glass plate with a material of 0.2 mm or less is available, and a lens part made of a resin having a large thermal expansion or hygroscopic expansion can be expected to have an effect of suppressing the expansion or contraction. Use is preferred.

  It is preferable that the refractive index difference (and its wavelength dependence) between the lenticular lens portion and the substrate is small. This is because when the refractive index difference is large, the reflection of light increases at the interface between the base material and the lenticular lens, and the transmittance decreases. The difference in refractive index is preferably 0.5 or less, more preferably 0.3 or less. When selecting the base material, it is necessary to select the base material so that the adverse effect of the refractive index difference between the lenticular lens portion and the base material on the aberrations is as small as possible.

  In addition, it is necessary to select the base material and the lenticular lens forming material in consideration of the following matters from the surface where the produced double-sided lenticular lens sheet is used for a liquid crystal display, an organic EL display, a plasma display, and the like. For example, when it is important to perform alignment with a flat display pixel such as a liquid crystal display, organic EL display, or plasma display, the display type and the thermal expansion coefficient can be used as the types of base materials described above. It is desirable to use materials that are close to each other. This not only makes it easy to suppress the misalignment between the pixel and the double-sided lenticular lens sheet, but also the misalignment between the pixel and double-sided lenticular lens sheet due to the thermal expansion between the display and double-sided lenticular lens sheet due to heat generation during use. Occurrence can also be suppressed.

  Expansion due to moisture absorption of the double-sided lenticular lens sheet also causes the same displacement as described above. Therefore, the base material of the double-sided lenticular lens sheet preferably has a small hygroscopic expansion, and is preferably equivalent to a display.

  On the other hand, when thermal expansion or hygroscopic expansion of the lenticular lens lens portion occurs on one side of the double-sided lenticular lens sheet, it causes warpage of the double-sided lenticular lens sheet. For example, if expansion due to moisture absorption occurs on the opposite side (viewer side) of the display pixel, it causes a warp of a shape such that the outside expands. Therefore, as a material for the lenticular lens lens part, it is preferable not only to use a member having small thermal expansion and hygroscopic expansion, but also to suppress moisture absorption by surface treatment, or to expand the lenticular lens part by Fresnel. It is preferable to reduce the stress generated by the shrinkage.

  When affixing a double-sided lenticular lens sheet to the display while aligning the adhesive, if the adhesive is applied to the entire surface of the double-sided lenticular lens sheet and affixed to the display, the adhesive will impair the function of the lens. The amount is preferably kept to a minimum. It is also preferable to provide an outer frame on the double-sided lenticular lens sheet and bond only the display and the peripheral part. Furthermore, it is also preferable that the bonding portion is an operation type via an actuator, and has a mechanism for bonding and correcting a positional deviation that has occurred over time during use.

(Other physical property improvements)
The double-sided lenticular lens sheet produced by the method for producing a double-sided lenticular lens sheet of the present invention preferably has excellent general resin properties, such as impact resistance, chemical resistance, and surface hardness. It is also preferable to use an additive or to apply an organic or inorganic hard coat or antireflection coat on the surface.

  It is also preferable that an antistatic function for preventing the adsorption of dust and dust due to static electricity is provided. It is also preferable that a flame retardant material or a flame retardant is contained.

(Guide forming resin)
As the guide forming resin, it is preferable to use the same resin as the lenticular lens forming resin in order to suppress unnecessary scattering and refraction of light at the interface with the lenticular lens and not to deteriorate the optical characteristics of the lens.

(Lenticular lens)
As the resin used for forming the lenticular lens, an active energy ray curable resin or a thermosetting resin can be used.

(Active energy ray curable resin)
The active energy ray-curable resin used in the present invention is a resin that is cured through a crosslinking reaction or the like by irradiation with actinic rays such as ultraviolet rays and electron beams. Typical examples of the active energy ray curable resin include an ultraviolet curable resin and an electron beam curable resin, but a resin curable by irradiation with actinic rays other than ultraviolet rays and electron beams may be used. It is also possible to use an antioxidant or an ultraviolet absorber in combination with the active energy ray curable resin.

  The active energy ray-curable resin is a resin obtained by curing a prepolymer, an oligomer and / or a monomer having a polymerizable unsaturated bond or an epoxy group in a molecule upon irradiation with energy rays.

  There is no restriction | limiting in particular as an ultraviolet-ray and an electron beam curable resin, It can use suitably selecting from what is used conventionally. This ultraviolet curable resin contains a photopolymerizable prepolymer, a photopolymerizable monomer, a photopolymerization initiator or a photosensitizer. The electron beam curable resin contains a photopolymerizable prepolymer or a photopolymerizable monomer.

  Examples of the photopolymerizable prepolymer include polyester acrylate, epoxy acrylate, urethane acrylate, and polyol acrylate. These photopolymerizable prepolymers may be used alone or in combination of two or more. Examples of the photopolymerizable monomer include polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, Examples include dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and neopentyl glycol di (meth) acrylate.

  Specific examples of the ultraviolet curable resin include, for example, ADEKA OPTMER KR, BY series KR-400, KR-410, KR-550, KR-566, KR-567, BY-320B (above, ADEKA Corporation) Manufactured by Koeihard Co., Ltd., A-101-KK, A-101-WS, C-302, C-401-N, C-501, M-101, M-102, T-102, D-102, NS- 101, FT-102Q8, MAG-1-P20, AG-106, M-101-C (manufactured by Guangei Chemical Industry Co., Ltd.), Seika Beam PHC2210 (S), PHCX-9 (K-3), PHC2213 , DP-10, DP-20, DP-30, P1000, P1100, P1200, P1300, P1400, P1500, P1600, SCR900 (above, Dainichi Manufactured by Kogyo Co., Ltd.), KRM7033, KRM7039, KRM7130, KRM7131, UVECRYL29201, UVECRYL29202 (above, Daicel UCB), RC-5015, RC-5016, RC-5020, RC-5031, RC-5100, RC-5102, RC-5120, RC-5122, RC-5152, RC-5171, RC-5180, RC-5181 (manufactured by DIC Corporation), Aulex No. 340 clear (manufactured by China Paint Co., Ltd.), Sun Rad H-601, RC-750, RC-700, RC-600, RC-500, RC-611, RC-612 (above, Sanyo Chemical Industries, Ltd.) , SP-1509, SP-1507 (above, manufactured by Showa Polymer Co., Ltd.), RCC-15C (produced by Grace Japan Co., Ltd.), Aronix M-6100, M-8030, M-8060 (above, Toagosei Co., Ltd.) (Made by Co., Ltd.), or other commercially available products. It is also possible to use an antioxidant or an ultraviolet absorber together with the thermosetting resin.

(Polymerization initiator)
The polymerization initiator may be a radical reaction type or an ion reaction type, and examples thereof include acetophenones, butylphenones, benzophenones, α-amyloxime esters, tetramethylchuram monosulfide, thioxanthones, and oxetane compounds. Moreover, n-butylamine, triethylamine, poly-n-butylphosphine, etc. can be mixed and used as a photosensitizer.

(Thermosetting resin)
The thermosetting resin used in the present invention is a resin that is cured through a crosslinking reaction or the like by heat. Examples of the thermosetting resin include unsaturated polyester resins, epoxy resins, vinyl ester resins, phenol resins, thermosetting polyimide resins, thermosetting polyamideimides, and the like.

As the unsaturated polyester resin, for example, orthophthalic acid resin, isophthalic acid resin, terephthalic acid resin, bisphenol resin, propylene glycol-maleic acid resin, dicyclopentadiene or derivatives thereof are introduced into the unsaturated polyester composition. Low styrene volatile resin with low molecular weight or added film-forming wax compound, low shrinkage with thermoplastic resin (polyvinyl acetate resin, styrene / butadiene copolymer, polystyrene, saturated polyester, etc.) Resin, unsaturated polyester brominated directly with Br ₂ or reactive type such as copolymerization of het acid, dibromoneopentyl glycol, halides such as chlorinated paraffin, tetrabromobisphenol and antimony trioxide, phosphorus Compound combinations Additive-type flame retardant resin that uses additives and aluminum hydroxide as additives, and toughness resins that are hybridized with polyurethane or silicone, or IPN toughness (high strength, high elastic modulus, high elongation), etc. is there.

  Examples of the epoxy resin include glycidyl ether type epoxy resins including bisphenol A type, novolak phenol type, bisphenol F type, brominated bisphenol A type, glycidyl amine type, glycidyl ester type, cyclic aliphatic type, and heterocyclic epoxy type. Special epoxy resins containing

  As the vinyl ester resin, for example, an oligomer obtained by ring-opening addition reaction of an ordinary epoxy resin and an unsaturated monobasic acid such as methacrylic acid is dissolved in a monomer such as styrene. There are also special types such as vinyl monomers having vinyl groups at the molecular ends and side chains. Examples of vinyl ester resins of glycidyl ether type epoxy resins include bisphenol type, novolak type, brominated bisphenol type, etc., and special vinyl ester resins include vinyl ester urethane type, isocyanuric acid vinyl type, side chain vinyl ester type, etc. There is.

  The phenol resin is obtained by polycondensation using phenols and formaldehyde as raw materials, and there are a resol type and a novolac type.

  Examples of thermosetting polyimide resins include maleic acid-based polyimides such as polymaleimide amine, polyamino bismaleimide, bismaleimide / O, O'-diallyl bisphenol-A resin, bismaleimide / triazine resin, and nadic acid-modified polyimide. And acetylene-terminated polyimide.

  A part of the actinic ray curable resin described above can also be used as a thermosetting resin. An antioxidant and an ultraviolet absorber may be used as appropriate together with the thermosetting resin.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(Production of double-sided lenticular lens sheet No. 101)
Using the production process shown in FIG. 7, a guide is produced on the substrate by the method shown in FIG. 13, alignment is performed according to the steps shown in FIG. 11, and a double-sided lenticular lens sheet is produced. 101.

Preparation of base material A glass sheet (manufactured by Nippon Electric Glass Co., Ltd.) having a thickness of 100 μm, a width of 1000 mm, and a length of 10 m was prepared as a base material. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Incision into the substrate As shown in FIG. 13, a glass substrate prepared using a 15 μm thick dicing blade has a 15 μm wide dotted line incision so that two guides are formed for each lenticular lens. Were attached to both ends of the glass substrate in parallel in the width direction.

  The interval between the two cuts was set at a position of 0.2 mm on both sides with reference to the apex of the concave portion of the mold.

Preparation of Resin Composition for Forming Lenticular Lens The following ultraviolet curable lenticular lens-forming resin composition was prepared.

45 parts by mass of phenoxyethyl acrylate (Biscoat # 192, manufactured by Osaka Organic Chemical Industry Co., Ltd.)
55 parts by mass of bisphenol A-diepoxy-acrylate (epoxy ester 3000A manufactured by Kyoeisha Yushi Chemical Co., Ltd.)
1.5 parts by mass of 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur 1173 manufactured by Ciba Japan Co., Ltd.)
Mold preparation Using a brass roll having a diameter of 500 mm and forming a convex lenticular lens by cutting using a carbide tool, the cylindrical roll mold shown in FIG. 5A is used as the first lenticular lens. Two were prepared for forming and for forming the second lenticular lens.

Groove width: 0.46 mm
Groove depth: 70mm
Number of grooves: 1920 formation of first lenticular lens and guide The prepared lenticular lens-forming resin composition was applied to the prepared notched substrate, using a slit die as a coating device, and the substrate was applied with a tension of 50 N / The film was applied to a thickness of 50 μm while being conveyed at a width of m and a speed of 2 m / min to form a first lenticular lens-forming coating film. Thereafter, in the first lenticular lens forming step shown in FIG. 7, the prepared first lenticular lens forming mold is pressed by a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). Press and adhere to the top. A state in which a part of the first lenticular lens-forming coating film protrudes to the opposite side of the substrate (referred to as the back surface side) from the cut portion attached to the substrate by pressing and intimate contact (see step 3 in FIG. 12). Become. While the coating film for forming the first lenticular lens and the mold are in close contact with each other, ultraviolet rays are irradiated from the back side using a metal halide lamp. By irradiating with ultraviolet rays, the first lenticular lens-forming coating film and the protruding first lenticular lens-forming coating film are cured, separated from the mold, and a convex first lenticular lens and a guide are formed. The portion that protrudes to the back side serves as a guide. The base material and the mold were aligned by an EPC control device arranged in the first lenticular lens forming step.

Formation of Second Lenticular Lens Subsequently, a resin composition for forming a lenticular lens on the back surface (the surface on which the guide is formed) of the base material on which the first lenticular lens and the guide are formed in the first lenticular lens forming step shown in FIG. Was applied to a thickness of 60 μm while conveying the substrate at a tension of 50 N / m width and a speed of 2 m / min to form a second lenticular lens-forming coating film. Thereafter, in the second lenticular lens forming step shown in FIG. 7, the mold, the first lenticular lens, and the guide were formed by the alignment mark provided on the base material and the EPC control device disposed in the second lenticular lens forming step. Primary alignment with the base material is performed, and the prepared second lenticular lens forming mold is pressed and adhered onto the second lenticular lens forming coating film with a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). It was.

Since the positions of the molds are slightly shifted at the time of pressing and closely contacting, the tops of the two guides are not in contact with the inner surface of the second lenticular lens mold at the same time. By further pressing, the base material moves to a position where the two guides are in contact with the inner surface of the second lenticular lens mold simultaneously (see step 2 and step 3 in FIG. 11). Secondary alignment ends. In this state, the apex of the first lenticular lens and the center of the concave portion of the second lenticular lens mold coincide with each other. Thereafter, a metal halide lamp is used to irradiate ultraviolet rays from the side on which the first lenticular lens is formed to cure the second lenticular lens-forming coating and separate from the second lenticular lens mold, thereby forming a convex first. Two lenticular lenses are formed, and a belt-like double-sided lenticular lens sheet is produced in which 1920 convex first lenticular lenses and convex second lenticular lenses are formed in the width direction of the substrate. Thereafter, using a 300 WCO ₂ laser cutter with an output of 300 WCO _{2 in the} cutting process, the sheet was cut into a width of 884 mm and a height of 550 mm, and the single-sided double-sided lenticular lens No. 1 was cut. 101.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

(Production of double-sided lenticular lens sheet No. 102)
Using the manufacturing process shown in FIG. 7, a guide is manufactured on the substrate by the method shown in FIG. 10, alignment is performed according to the steps shown in FIG. 11, and a double-sided lenticular lens sheet is manufactured. 102.

Preparation of base material Double-sided lenticular lens sheet No. The same base material as the base material prepared in 101 was prepared, and a 10 μm-thick tin oxide sol layer (coated with Mitsubishi Materials S-2000) was provided on one side as a heat absorption layer. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Preparation of first and second lenticular lens-forming resin compositions The following thermosetting first and second lenticular lens-forming resin compositions were prepared.

45 parts by mass of phenoxyethyl acrylate (Biscoat # 192, manufactured by Osaka Organic Chemical Industry Co., Ltd.)
55 parts by mass of bisphenol A-diepoxy-acrylate (epoxy ester 3000A manufactured by Kyoeisha Yushi Chemical Co., Ltd.)
Dilauroyl peroxide (Nippon Yushi Co., Ltd., Parroyl L) 1.5 parts by mass Preparation of mold Forming a convex lenticular lens on a 500 mm diameter brass roll by cutting using a carbide tool. Two cylindrical roll molds shown in FIG. 1 were prepared for forming a first lenticular lens and for forming a second lenticular lens.

Groove width: 0.46 mm
Groove depth: 70mm
Number of grooves: 1920 formation of first lenticular lens The prepared lenticular lens-forming resin composition was applied to the prepared base material using a slit die as a coating device, and the base material was tensioned at 50 N / m width and speed 2 m / second. The film was applied to a thickness of 50 μm while being conveyed in min to form a first lenticular lens-forming coating film. Thereafter, in the first lenticular lens forming step shown in FIG. 7, the prepared first lenticular lens forming mold is pressed by a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). Applying heat to the first lenticular lens-forming coating film by pressing and adhering to it, and irradiating infrared rays from the back side using an infrared lamp while the first lenticular lens-forming coating film and the mold are in close contact with each other. Do. By applying heat, the first lenticular lens-forming coating film is cured and separated from the mold to form a convex first lenticular lens. The base material and the mold were aligned by an EPC control device arranged in the first lenticular lens forming step.

Formation of second lenticular lens guide and second lenticular lens Subsequently, second lenticular lens formation prepared on the opposite surface (back surface) of the substrate on which the first lenticular lens was formed in the second lenticular lens forming step shown in FIG. The resin composition for coating was applied to a thickness of 65 μm while using a slit die as a coating device, and transporting the substrate at a tension of 50 N / m width and a speed of 2 m / min to form a second lenticular lens-forming coating film. Thereafter, a YAG laser is irradiated to a position 0.2 mm in both directions from the apex of the convex first lenticular lens formed from the side on which the second lenticular lens-forming coating film is formed. The irradiated portion is cured into a convex shape, and two guides are formed for the first lenticular lens (see step 1 in FIG. 11).

YAG Laser Irradiation Conditions Light amount: A YAG laser beam with an energy per pulse of 0.8 mJ focused at 30 μm was irradiated so as to be arranged in a straight line.

  Thereafter, in the second lenticular lens forming step shown in FIG. 7, the mold and the convex first lenticular lens and the convex shape are formed by the alignment mark provided on the base material and the EPC control device disposed in the second lenticular lens forming step. The second lenticular lens forming mold was first aligned with the base material on which the guide was formed, and the prepared mold for forming the second lenticular lens was applied to the second lenticular lens forming coating with a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). Press and adhere to the membrane.

Since the position of the mold is slightly shifted at the time of pressing and closely contacting, one of the two guides is not in contact with the inner surface of the mold for the second lenticular lens (see FIG. 10 step 2). By further pressing, the base material moves to a position where the two guides come into contact with the inner surface of the mold for the second lenticular lens (see step 2 and step 3 in FIG. 11), and the secondary alignment is completed. . In this state, the apex of the first lenticular lens and the center of the concave portion of the mold for the second lenticular lens coincide with each other. Thereafter, the second lenticular lens is formed by irradiating infrared rays using an infrared lamp from the side where the first lenticular lens is formed, curing the coating film for forming the second lenticular lens, and separating it from the mold for the second lenticular lens. A lens is formed, and a band-shaped double-sided lenticular lens in which 1920 first lenticular lenses and second lenticular lenses are formed in the width direction of the base material is manufactured. Thereafter, using a 300 WCO ₂ laser cutter with an output of 300 WCO _{2 in the} cutting step, the sheet was cut into a width of 883 mm and a length of 550 mm, and the single-sided double-sided lenticular lens sheet No. 102.

Irradiation conditions of infrared lamps Light quantity: Five halogen lamps with an output of 1500 W were arranged and irradiated at an irradiation distance of 5 cm.

(Production of double-sided lenticular lens sheet No. 103)
Using the production process shown in FIG. 7, a guide is produced on the substrate by the method shown in FIG. 12, alignment is performed according to the steps shown in FIG. 12, and a double-sided lenticular lens sheet is produced. 103.

Preparation of base material Double-sided lenticular lens sheet No. The same glass sheet as 101 was prepared as a base material. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Preparation of resin composition for lenticular lens formation Double-sided lenticular lens sheet no. The same ultraviolet curable lenticular lens-forming resin composition as 101 was prepared.

Preparation of mold 1 Double-sided lenticular lens sheet No. The same mold as that used when producing 101 was prepared, and mold 1 was obtained.

Preparation of mold 2 A figure of forming a concave lenticular lens by cutting using a carbide tool on a hollow glass (optical glass (SFL6), refractive index nd = 1.805) roll having a diameter of 500 mm and a thickness of 3 mm A plate-like stamper mold shown in FIG.

Width of convex portion (width of base portion of convex portion formed on mold base): 0.46 mm
Convex part height (height from the surface formed on the mold base to the apex of the convex part): 0.02 mm
Number of convex parts: 1920 formation of first lenticular lens The prepared lenticular lens-forming resin composition was applied to the prepared base material using a slit die as a coating device, and the base material had a tension of 50 N / m width and a speed of 2 m. The film was applied to a thickness of 10 μm while being conveyed at a rate of / min to form a first lenticular lens-forming coating film. Thereafter, in the first lenticular lens forming step shown in FIG. 7, the prepared first lenticular lens forming mold 2 is formed with a pressing roll (material: material: Teflon (registered trademark), pressure 100 kPa) for forming the first lenticular lens. The film is pressed and brought into close contact with the coating film, and ultraviolet rays are irradiated from the back side using a metal halide lamp while the first lenticular lens-forming coating film and the mold 2 are in close contact. By irradiating with ultraviolet rays, the first lenticular lens-forming coating film is cured and separated from the mold 2 to form a concave first lenticular lens. The base material and the mold were aligned by an EPC control device arranged in the first lenticular lens forming step.

Irradiation conditions of metal halide lamp Light quantity, etc .: One light-cooled metal halide lamp having a light emission length of 1000 mm and 22 kW was used.

Formation of second lenticular lens guide and second lenticular lens Subsequently, the second lenticular lens forming resin is formed on the opposite surface (back surface) of the base material on which the first lenticular lens is formed in the second lenticular lens forming step shown in FIG. The composition was applied to a thickness of 65 μm while using a slit die as a coating device and the substrate was conveyed at a tension of 50 N / m width and a speed of 2 m / min to form a second lenticular lens-forming coating film. Thereafter, ultraviolet rays are irradiated from the side on which the concave first lenticular lens is formed using a metal halide lamp. The irradiated ultraviolet rays are condensed in a stripe shape on the second lenticular lens-forming coating film by the concave first lenticular lens, and the condensed portion is cured in a convex shape to form a guide (see step 1 in FIG. 12). ).

Irradiation conditions of metal halide lamp Light quantity, etc .: One light-cooled metal halide lamp having a light emission length of 1000 mm and 22 kW was used.

  Thereafter, in the second lenticular lens forming step shown in FIG. 7, the mold 1 and the concave first lenticular lens and the convex shape are formed by the alignment mark provided on the base material and the EPC control device arranged in the second lenticular lens forming step. The second lenticular lens forming mold 1 is first aligned with the base material on which the guide is formed, and the prepared second lenticular lens forming mold 1 is pressed with a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). Press and adhere to the membrane.

At the time of pressing and closely contacting, the position of the mold is slightly shifted, so that the top of the guide is not in contact with the center of the mold 1 for the second lenticular lens (see step 2 in FIG. 12). By further pressing, the base material moves to a position where the abutting guide abuts the center of the mold 1 for the second lenticular lens (see step 2 and step 3 in FIG. 12), and the secondary alignment is performed. finish. In this state, the apex of the first lenticular lens and the center of the concave portion of the mold 1 for the second lenticular lens coincide with each other. Thereafter, by using a high-pressure mercury UV lamp from the side where the first lenticular lens is formed and irradiating with ultraviolet rays, the second lenticular lens-forming coating film is cured and separated from the mold 1 for the second lenticular lens. A second lenticular lens is formed, and a belt-like double-sided lenticular lens in which 1920 first lenticular lenses and second lenticular lenses are formed in the width direction of the substrate is manufactured. Thereafter, using a 300 WCO ₂ laser cutter with an output of 300 WCO _{2 in the} cutting step, the sheet was cut into a width of 883 mm and a length of 550 mm, and the single-sided double-sided lenticular lens sheet No. 103.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

(Production of double-sided lenticular lens sheet No. 104)
Using the manufacturing process shown in FIG. 7, a guide is manufactured on the base material by the method shown in FIG. 11, alignment is performed according to the steps shown in FIG. 11, and a double-sided lenticular lens sheet is manufactured. 104.

Preparation of base material Double-sided lenticular lens sheet No. The same glass sheet as 101 was prepared as a base material. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Preparation of resin composition for lenticular lens formation Double-sided lenticular lens sheet no. The same ultraviolet curable lenticular lens-forming resin composition as 101 was prepared.

Mold preparation Double-sided lenticular lens sheet No. The same cylindrical roll mold as the cylindrical roll mold used when producing 101 was prepared and used as a mold. The first lenticular lens formation and the second lenticular lens formation have the same shape.

Formation of the first lenticular lens The prepared lenticular lens forming resin composition was applied to the prepared base material using a slit die as a coating device, and the base material was transported at a tension of 50 N / m width and a speed of 2 m / min. The film was applied to a thickness of 50 μm to form a first lenticular lens-forming coating film. Thereafter, in the first lenticular lens forming step shown in FIG. 7, the prepared first lenticular lens forming mold is pressed by a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). Pressing and adhering to the top, while the first lenticular lens-forming coating film and the mold are in intimate contact with each other, ultraviolet rays are irradiated from the back side using a metal halide lamp. By irradiating with ultraviolet rays, the first lenticular lens-forming coating film is cured and separated from the mold to form a convex first lenticular lens. The base material and the mold were aligned by an EPC control device arranged in the first lenticular lens forming step.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

Formation of second lenticular lens guide and second lenticular lens Subsequently, the second lenticular lens forming resin is formed on the opposite surface (back surface) of the base material on which the first lenticular lens is formed in the second lenticular lens forming step shown in FIG. The composition was applied to a thickness of 65 μm while using a slit die as a coating device and the substrate was conveyed at a tension of 50 N / m width and a speed of 2 m / min to form a second lenticular lens-forming coating film. Thereafter, ultraviolet rays are irradiated from the side on which the convex first lenticular lens is formed using a metal halide lamp. The irradiated ultraviolet rays are condensed in a stripe shape on the second lenticular lens-forming coating film by the convex first lenticular lens, and the condensed portion is cured in a convex shape to form a guide (step 1 in FIG. 10). reference).

Irradiation conditions of metal halide lamp Light quantity, etc .: Two water-cooled metal halide lamps having a light emission length of 1000 mm and 22 kW were used.

  Thereafter, in the second lenticular lens forming step shown in FIG. 7, the mold and the convex first lenticular lens and the second are formed by the alignment mark provided on the base material and the EPC control device arranged in the second lenticular lens forming step. Primary alignment is performed with a base material having a convex guide formed on the coating film for forming a lenticular lens, and the prepared mold for forming the second lenticular lens is pressed with a pressing roll (material: Teflon (registered trademark), pressure 50 kPa). ) To press and adhere onto the second lenticular lens-forming coating film.

At the time of pressing and closely contacting, the position of the mold is slightly shifted, so that the top of the guide is not in contact with the center of the mold 1 for the second lenticular lens (see step 2 in FIG. 10). By further pressing, the base material moves to a position where the abutting guide abuts on the center of the mold for the second lenticular lens (see step 2 and step 3 in FIG. 10), and the secondary alignment is completed. To do. In this state, the apex of the first lenticular lens and the center of the concave portion of the mold for the second lenticular lens coincide with each other. Thereafter, the high-pressure mercury UV lamp is used to irradiate ultraviolet rays from the side where the first lenticular lens is formed to cure the second lenticular lens-forming coating film and separate it from the mold for the second lenticular lens. Two lenticular lenses are formed, and a belt-like double-sided lenticular lens sheet is produced in which 1920 first lenticular lenses and second lenticular lenses are formed in the width direction of the substrate. Thereafter, using a 300 WCO ₂ laser cutter with an output of 300 WCO _{2 in the} cutting step, the sheet was cut into a width of 883 mm and a length of 550 mm, and the single-sided double-sided lenticular lens sheet No. 104.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

(Production of double-sided lenticular lens sheet No. 105)
Using the production process shown in FIG. 8, a guide is produced on the substrate by the method shown in FIG. 10, alignment is performed according to the steps shown in FIG. 10, and a double-sided lenticular lens sheet is produced. 105.

Preparation of base material A sheet glass sheet (manufactured by Nippon Electric Glass Co., Ltd.) cut in advance to a thickness of 100 μm, a width of 900 mm, and a length of 550 mm was prepared as a base material. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Preparation of resin composition for lenticular lens formation Double-sided lenticular lens sheet no. The same ultraviolet curable lenticular lens-forming resin composition as 101 was prepared.

Preparation of mold 1 A cylindrical roll mold shown in FIG. 5 (a) is prepared by using a brass roll having a diameter of 500 mm and forming a convex lenticular lens by cutting using a carbide tool. It was set as type 1.

Groove width: 0.46 mm
Groove depth: 0.07mm
Number of grooves: 1920 Preparation of mold 2 Using a Ni rolled plate having a width of 900 mm, a length of 550 mm, and a thickness of 10.0 mm, a convex lenticular lens is formed by cutting using a cemented carbide tool. A stamper type mold shown in FIG.

Formation of the first lenticular lens The resin composition for forming the lenticular lens was fixed to the prepared base material in the first resin coating step shown in FIG. The film was applied to a thickness of 50 μm to form a first lenticular lens-forming coating film.

  Thereafter, in the first lenticular lens forming step shown in FIG. 8, the prepared mold 1 is rotated (moved) while being pressed (pressure 50 kPa) on the first lenticular lens-forming coating film. While the coating film for forming the first lenticular lens and the mold 1 are in close contact with each other, ultraviolet rays are irradiated from the back side using a metal halide lamp. By irradiating with ultraviolet rays, the first lenticular lens-forming coating film is cured, and by separating the mold, a convex first lenticular lens is formed. The alignment between the base material and the mold was performed by an alignment mark attached to the base material and an EPC control device disposed in the first lenticular lens forming step.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

Formation of Second Lenticular Lens Guide and Second Lenticular Lens Subsequently, the second lenticular lens is fixed on the mounting table in the second resin coating step shown in FIG. 8, and the second lenticular lens is formed on the opposite surface (back surface) of the substrate on which the first lenticular lens is formed. Using a slit die as a coating apparatus, the 2 lenticular lens forming resin composition was applied to a thickness of 50 μm to form a second lenticular lens forming coating film. Thereafter, the film is transported to the guide forming step shown in FIG. 8, and the alignment mark attached to the substrate and the alignment mark attached to the mounting table are placed on the mounting table with the second lenticular lens forming coating film facing up. Are fixed together and irradiated with ultraviolet rays using a metal halide lamp from the side where the convex first lenticular lens is formed. The irradiated ultraviolet rays are condensed in a stripe shape on the second lenticular lens-forming coating film by the convex first lenticular lens, and the condensed portion is cured in a convex shape to form a guide (step 1 in FIG. 10). reference).

Irradiation conditions of metal halide lamp Light quantity, etc .: One light-cooled metal halide lamp having a light emission length of 1000 mm and 22 kW was used.

  Then, it conveys to the 2nd lenticular lens formation process shown in FIG. 8, the alignment mark provided in the base material and the alignment mark attached to the mounting base are aligned, and a guide fixes to a mounting base. Thereafter, the prepared mold 2 is pressed (pressure 200 kPa), and is pressed and adhered onto the second lenticular lens-forming coating film.

  At the time of pressing and closely contacting, the position of the mold is slightly shifted so that the apex of the guide is not in contact with the center of the mold 2 (see step 2 in FIG. 10). By further pressing, the base material moves to a position where the abutting guide abuts on the center of the mold for the second lenticular lens (see step 2 and step 3 in FIG. 10), and the secondary alignment is completed. To do. In this state, the apex of the first lenticular lens and the center of the concave portion of the mold 2 coincide with each other. Thereafter, the second lenticular lens mold is separated by irradiating ultraviolet rays using a high-pressure mercury UV lamp from the side where the first lenticular lens is formed, curing the second lenticular lens-forming coating film, and separating the mold for the second lenticular lens. Two lenticular lenses are formed, and a single-sided double-sided lenticular lens sheet in which 1920 first lenticular lenses and second lenticular lenses are formed in the width direction of the substrate is produced. This is a double-sided lenticular lens sheet no. 105.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

(Production of double-sided lenticular lens sheet No. 106)
Using the production process shown in FIG. 9, a guide is produced on the substrate by the method shown in FIG. 14, alignment is performed according to the steps shown in FIG. 14, and a double-sided lenticular lens sheet is produced. 106.

Preparation of base material Double-sided lenticular lens sheet No. The same glass sheet as 101 was prepared as a base material. In addition, alignment marks were provided at both ends of the base material for alignment with the mold.

Preparation of Resin Composition for Forming Lenticular Lens The first lenticular lens-forming resin composition is a double-sided lenticular lens sheet no. Photopolymerization initiating photopolymerization initiator Darocur 1173 (manufactured by Ciba Japan Co., Ltd.), which cures only with ultraviolet rays, with either ultraviolet rays or visible light, among the lenticular lens-forming resin composition used in the production of 101 In place of the agent Irgacure 784 (manufactured by Ciba Japan Co., Ltd.), 1.5 parts by mass were added and prepared.

  The resin composition for forming the second lenticular lens is a double-sided lenticular lens sheet no. The same lenticular lens-forming resin composition as the lenticular lens-forming resin composition used in the production of 101 was prepared.

Application of the first lenticular lens-forming resin composition and the second lenticular lens-forming resin composition The prepared lenticular lens-forming resin composition is transported at a speed of 2 m / min as a coating device on both surfaces of the prepared substrate. The first lenticular lens-forming coating film and the second lenticular lens-forming coating film were formed (see step 1 in FIG. 14).

Guide formation A UV laser is irradiated from the first lenticular lens-forming coating film side to guide the first lenticular lens-forming coating film and the second lenticular lens-forming coating film with a width of 20 μm, a height of 50 μm, and an interval of 0.35 mm. Two were formed corresponding to one lenticular lens (see step 2 in FIG. 14).

Irradiation condition of UV laser Light amount: A YAG-THG (355 nm) laser having an output of 10 mW was focused on φ20 μm and scanned at 100 m / s.

Mold preparation Double-sided lenticular lens sheet No. The same cylindrical roll mold as the cylindrical roll mold used when producing 101 was prepared and used as a mold. The first lenticular lens formation and the second lenticular lens formation have the same shape. Teflon (registered trademark) was applied to the surface of the mold that contacts the first lenticular lens-forming coating film and the second lenticular lens-forming coating film.

Formation of the first lenticular lens and the second lenticular lens Thereafter, the base material on which the first lenticular lens-forming coating film and the second lenticular lens-forming coating film are formed is conveyed to the first lenticular lens forming step shown in FIG. The first lenticular lens-forming coating film is pressed and brought into close contact with the prepared first lenticular lens-forming mold (see step 3 in FIG. 14). Since the position of the mold is slightly shifted at the time of pressing and intimate contact, the top of one guide is in contact with the mold for the first lenticular lens (see step 3 in FIG. 14). By further pressing, the base material moves to a position where the two guides come into contact with the first lenticular lens mold (see step 4 in FIG. 14). In this state, the center of the concave portion of the mold for the first lenticular lens coincides with the intermediate point between the two guides. While the first lenticular lens-forming coating film is in close contact with the mold, visible light is irradiated from the back side of the second lenticular lens-forming coating film using a metal halide lamp through an ultraviolet cut filter. By irradiating visible light, the first lenticular lens-forming coating film is cured and separated from the mold, and 1920 convex first lenticular lenses are formed in the width direction of the substrate (steps 3 and 4 in FIG. 14). See). The base material and the mold were aligned by an EPC control device arranged in the first lenticular lens forming step.

  Subsequently, the film is transported to the second lenticular lens forming step shown in FIG. 9, and the second lenticular lens forming coating is pressed and brought into close contact with the prepared second lenticular lens forming mold (see steps 3 and 4 in FIG. 14). Then, after the same process as the formation of the first lenticular lens, while the second lenticular lens-forming coating film and the mold are in close contact with each other, ultraviolet rays are irradiated from the back side of the second lenticular lens-forming coating film using a metal halide lamp. As a result, the coating film for forming the second lenticular lens is cured and separated from the mold, and 1920 convex second lenticular lenses are formed in the width direction of the substrate (see steps 3 and 4 in FIG. 14). Then, a belt-like double-sided lenticular lens sheet in which 1920 convex first lenticular lenses and second lenticular lenses are formed in the width direction of the base material is produced. The base material and the mold were aligned by an EPC control device arranged in the second lenticular lens forming step.

Thereafter, using a 300 WCO ₂ laser cutter with an output of 300 WCO _{2 in the} cutting step, the sheet was cut into a width of 883 mm and a length of 550 mm, and the single-sided double-sided lenticular lens sheet No. 106.

Irradiation conditions of metal halide lamp Light quantity, etc .: Five light-cooled metal halide lamps with a light emission length of 1000 mm and 22 kW were used.

(Production of comparative double-sided lenticular lens sheet No. 107)
A double-sided lenticular lens sheet No. 1 is used except that the manufacturing process shown in FIG. A double-sided lenticular lens sheet was produced by the same production method as in No. 104, and 107.

(Production of comparative double-sided lenticular lens sheet No. 108)
A double-sided lenticular lens sheet No. is used except that the manufacturing process shown in FIG. A double-sided lenticular lens sheet was produced by the same production method as in No. 103, and 108.

(Production of comparative double-sided lenticular lens sheet No. 109)
A double-sided lenticular lens sheet No. is used except that the manufacturing process shown in FIG. A double-sided lenticular lens sheet was produced by the same production method as in No. 105, and 109.

Evaluation Each double-sided lenticular lens sheet No. Table 1 shows the results of measuring the deviation of the optical axis from 101 to 109 by the following method.

Sampling method Band-shaped double-sided lenticular lens sheet No. In the case of 101 to 104, 106, and 107, 10 double-sided lenticular lens sheets cut every 1 m were sampled.

  Single-sided lenticular lens sheet No. In the case of 105 and 109, 10 sheets were sampled each.

Measuring method of optical axis deviation A cross section of each double-sided lenticular lens sheet was photographed with a scanning electron microscope (Keyence 3D Real Surface View Microscope VE-9800). The average value of the magnitude of the deviation of the optical axis at 30 points was obtained.

  A double-sided lenticular lens sheet No. 1 produced by forming a guide and aligning the first lenticular lens and the second lenticular lens. It has been found that all of 101 to 106 have excellent performance with small optical axis misalignment.

  Double-sided lenticular lens sheet no. Nos. 107 to 109 are double-sided lenticular lens sheets No. 1 prepared by the method of the present invention. It was confirmed that the optical axis was greatly displaced from 101 to 106 and the performance was inferior.

  The effectiveness of the present invention was confirmed.

1, 1 'Double-sided lenticular lens sheet 101, 101' Transparent substrate 102, 102 ', 4, 4', 6 First lenticular lens 102a, 102'a, 103a, 103'a Lenticular lens 103, 103 ', 5b, 5′b, 8c Second lenticular lens 2, 2 ′, 2 ″ production process 2a, 2′a, 2 ″ a supply process 2b, 2′c, 2 ″ e First lenticular lens formation process 2c, 2′e, 2 "f 2nd lenticular lens forming process 2d, 2'g Recovery process 2b1, 2'b1, 2c1, 2'd1, 2" b1, 2 "c1 Resin coating device 2b2, 2c2, 2'c1, 2'e1 Gold Mold 2b3, 2c3 Pressing roller 2b4, 2c4, 2'c3, 2'e3, 2h1, 2'h1 Active energy ray irradiation device 2'b First resin coating step 2 "b First application step 2 ″ c Second application step
2'd Second resin coating process 2'f Cutting process 2b'2, 2b "2 Roll mold 2'c'1,2'c" 1 Stamper mold 2h, 2'h, 2 "d Guide formation Step 3, 3 ″ strip substrate 3 ′ single substrate 3a cut 4 ″ a1, 4 ″ a2, 4 ″ b1, 4 ″ b2, 5a, 5′a, 8a, 8b, 9 guide 4 ″ a first lenticular lens formation Coating film 4 ″ b, 5, 5 ′, 8 Coating film for forming second lenticular lens

Claims (4)

In the method for producing a double-sided lenticular lens sheet in which a mold is pressed against a coating film for lenticular lens formation formed on both sides of a support, and a lenticular shaped lens is molded on both sides.
A guide forming step of forming a guide on at least one side of the support;
A method for producing a double-sided lenticular lens sheet, comprising: aligning the mold with the guide and molding a lenticular lens by molding a lenticular lens. The method for producing a double-sided lenticular lens sheet according to claim 1, wherein the guide is formed on the lenticular lens-forming coating film. The method for producing a double-sided lenticular lens sheet according to claim 1, wherein the coating film for forming a lenticular lens has an active energy ray curable resin. The method for producing a double-sided lenticular lens sheet according to claim 1, wherein the coating film for forming a lenticular lens has a thermosetting resin.

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