JP2010237707A - Hologram copy method and hologram producing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a thin hologram laminate, and to copy the hologram laminate without using an optical contact liquid. <P>SOLUTION: The hologram laminate includes a hologram record layer 1 made of a photosensitive material, a hard coat 2 coated on the upper face of the hologram record layer 1 and a hard coat 3 coated on the lower face of the hologram record layer 1. The hard coats 2, 3 are made of an energy ray curing resin. The energy ray curing resin of the hard coats 2, 3 may be either in a fully cured state or in a half cured state. When the hologram laminate is formed as a sticker, a separator layer (a release film made of a resin such as PET) 5 is present on the lower face of the hard coat 3 through an adhesive layer 4. The thickness of the hologram laminate can be decreased to 50 μm or less. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hologram replication method and a hologram creation method applied to a Lippmann hologram.

  Holograms that can be displayed three-dimensionally are used for authenticating credit cards. At present, embossed holograms in which interference films are recorded as surface irregularities are often used. However, the embossed hologram has a problem that it is easily forged. On the other hand, a Lippmann hologram that records an interference film as a difference in refractive index inside the film is extremely difficult to counterfeit. The reason is that advanced technology is required to produce a recorded image, and recording materials are difficult to obtain.

  The process of producing a Lippmann-type hologram is roughly divided into a content production process consisting of processing such as image capturing or image acquisition by computer graphics, editing of the acquired image, hologram master making process, and replication. (Mass production) process. Each of the plurality of images obtained in the image editing process is converted into a strip-shaped image by a cylindrical lens, for example. An original plate is produced by sequentially recording interference fringes between object light and reference light of an image on a hologram recording medium as strip-shaped element holograms. A hologram recording medium is brought into close contact with the original, irradiated with laser light, and a hologram is duplicated.

  In this hologram, for example, image information obtained by sequentially capturing images from different observation points in the horizontal direction is sequentially recorded in the horizontal direction as strip-shaped element holograms. Therefore, when the observer views the hologram with both eyes The two-dimensional images shown in the left and right eyes are slightly different. As a result, the observer feels parallax and a three-dimensional image is reproduced.

  As described above, when strip-shaped element holograms are sequentially recorded, an HPO (Horizontal Parallax Only) hologram having a parallax only in the horizontal direction is created. The HPO type has a short printing time and can realize high-quality recording. Furthermore, vertical parallax can also be included in the recording method. A hologram having parallax in both the horizontal direction and the vertical direction is called an FP (Full Parallax) type hologram.

  As a hologram recording medium (hereinafter referred to as a hologram laminate) used for the above-described duplication, one described in Patent Document 1 below is shown in FIG. However, the structure described in Patent Document 1 is a configuration that does not include the blocking layer 106 and the surface protective layer 108.

JP-A-9-090857

  In FIG. 13, an adhesive layer 102, a black sheet 103, an adhesive layer 104, and a photosensitive material with respect to a separator layer 101 (also referred to as a release paper, a release film, a cover sheet, etc.) indicated by the lowermost two-dot chain line For example, a hologram recording layer 105 made of a photopolymer, a blocking layer (hard coat, etc.) 106, a support film 107, and a surface protective layer (hard coat) 108 are laminated in this order. The separator layer 101 is made of, for example, PET (polyethylene terephthalate).

  For the support film 107, PET, PC (polycarbonate), PMMA (polymethyl methacrylate) or the like is used. Since the surface hardness of the support film 107 is low and easily scratched, it is necessary to form a hard coat 108 by performing a hard coat treatment on the surface. Further, it is difficult to manufacture the support film 107 as thin as several μm to several tens of μm.

  In order to maintain the image quality of the image recorded on the hologram recording layer 105, the birefringence of the support film 107 needs to be sufficiently small, and the refractive index of the support film 107 and the photosensitive material of the hologram recording layer 105 It is desirable that the refractive index be the same.

  Since the support film 107 is chemically damaged by the components of the photosensitive material (chemical attack), it is necessary to provide a blocking layer (hard coat or the like) 106 between the hologram recording layer 105 and the support film 107. .

  It is necessary to apply the adhesive layer 104 to the surface of the hologram recording layer 105 after the photosensitive material is completely polymerized, and it is difficult to form the adhesive layer in a state where the monomer component remains unexposed. It is.

  For the reasons described above, a configuration that can be actually realized is shown in FIG. Such a hologram laminate is thicker than 100 μm even if the separator layer 101 is removed. In the case of using a hologram laminate on a product itself, there are many demands for making the total thickness as thin as possible. In addition, there is a problem that the manufacturing process becomes complicated and the manufacturing cost increases. Further, when a replica is created by laser exposure, if an air layer enters between the hologram master and the hologram laminate, the refractive index changes and stable replication cannot be achieved. For this reason, usually, a process of applying an optical contact liquid to the interface between the original and the hologram laminate and removing the air to make contact is required. However, it is difficult to completely prevent air from entering, and the use of the optical contact liquid is problematic because the optical contact liquid has a harmful effect on the human body.

  Accordingly, an object of the present invention is to provide a hologram replication method and a hologram production method in which these problems are solved.

In order to solve the above-described problems, the present invention includes a photosensitive material coated on an energy ray curable resin,
The photosensitive material is disposed opposite to the original having a recorded hologram recording layer,
The photosensitive material is in close contact with the original,
This is a hologram replication method in which laser light is irradiated from the energy beam curable resin side to a photosensitive material and an original plate in a close contact state.

A coating process in which a photosensitive material is coated on the energy ray curable resin at a constant thickness;
A duplication process in which a photosensitive material is brought into close contact with a master having a recorded hologram recording layer, and laser light is irradiated to the photosensitive material and the master in a close contact state from the energy ray curable resin side;
And a curing step for curing an energy beam curable resin applied to the photosensitive material.

  Preferably, the first position where the coating process is performed, the second position where the replication process is performed, and the third position where the curing process is performed are connected in-line by the conveying means.

The present invention includes an application step of applying a photosensitive material with a constant thickness on the first energy beam curable resin;
A duplication process in which a photosensitive material is closely attached to an original having a recorded hologram recording layer, and a laser beam is irradiated from the first energy beam curable resin side to the photosensitive material and the original in an intimate state;
A bonding step of bonding the photosensitive material and the second energy ray curable resin;
And a curing step of curing the first and second energy ray curable resins deposited on both surfaces of the photosensitive material.

  Preferably, the first position for performing the coating process, the second position for performing the duplication process, the third position for performing the bonding process, and the fourth position for performing the curing process are respectively connected inline by the conveying means. Yes.

  In this invention, the hologram recording layer is formed by applying a photosensitive material to a support made of an energy ray curable resin. The support can be prepared by thinly applying an energy ray curable resin, and the thickness can be reduced. The support itself to which the photosensitive material is applied has a hard coat function and is formed as a surface protective layer.

  In this invention, the surface protective layer applied to the hologram recording layer is formed by thinly applying an energy ray curable resin on the release paper. The adhesive layer is similarly formed by coating. When the hologram laminate is affixed to a product, the adhesive layer itself is made black in order to prevent the image from being difficult to see due to the background, so there is no need to use a black sheet.

  A surface protective layer and a blocking layer formed of an energy ray curable resin can easily use a resin material having birefringence close to zero and the same refractive index as that of the photosensitive material. By using an energy ray curable resin layer instead of a general resin film as a support, the total thickness of the hologram laminate can be reduced, the cost can be reduced, and the refractive index of each constituent layer can be made uniform.

  The air between the hologram master and the hologram laminate can be removed by bringing the wet photosensitive material into close contact with the hologram master surface without using an optical contact liquid during replication by laser exposure.

  By not using a resin film in the components of the hologram laminate, when the hologram laminate is peeled off after being affixed to a product, the energy beam curable resin layer itself, which is brittle in strength, is destroyed and the hologram laminate is reattached. Cannot be attached. This can increase security.

It is an approximate line figure used for explanation of an example of image processing at the time of holographic stereogram creation. It is a basic diagram which shows an example of the optical system of a holographic stereogram printer apparatus. It is a basic diagram which shows the photosensitive process of a photopolymerization type photopolymer. It is sectional drawing of one Embodiment of the hologram laminated body by this invention. It is sectional drawing of the modification of one Embodiment of the hologram laminated body by this invention. It is sectional drawing which shows the laminated structure of each process in the hologram production method of one embodiment of this invention. It is a basic diagram which shows the application | coating of the photosensitive material in a hologram production method, drying, and a film | membrane pressure control process. It is a basic diagram which shows the duplication, bonding, and ultraviolet curable resin hardening process in a hologram production method. It is a basic diagram which shows the external appearance test | inspection in the hologram production method, die cutting, and a winding process. It is a basic diagram used for description of the duplication process of a duplication apparatus. It is a basic diagram used for description of an example of the structure which laminated the hologram laminated body. It is a basic diagram used for description of the other example of the structure which laminated the hologram laminated body. It is sectional drawing which shows the structure of the conventional hologram laminated body.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below are specific examples of the present invention, and various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless stated to the effect, the present invention is not limited to the embodiment. The description will be given in the following order.
1. Embodiment 2 FIG. Other embodiment (modification)

1. One Embodiment [Hologram Master Making System]
First, an original plate on which a hologram is recorded is created. The original plate is created, for example, by sequentially recording a plurality of strip-shaped element holograms having horizontal parallax information on one hologram recording medium. That is, as shown in FIG. 1, each of the plurality of pieces of image data D1 including the parallax information is divided into slits in the parallax direction, that is, the horizontal (width) direction, and the divided slices are collected and processed. D5 is reconfigured.

  The optical system of the printer apparatus for creating such an original will be described in more detail with reference to FIG. 2A is a diagram of the entire optical system of the printer apparatus as viewed from above, and FIG. 2B is a diagram of the optical system of the entire printer apparatus as viewed from the side.

  As shown in FIG. 2, the printer device includes a laser light source 31 that emits laser light having a predetermined wavelength, and a shutter 32, a mirror 38, and a half mirror 33 arranged on the optical axis of the laser light L <b> 1 from the laser light source 31. And. Here, an argon laser having a wavelength of 514.5 nm and an output of 200 mW was used as the laser light source 31.

  The shutter 32 is controlled by a control computer and is closed when the hologram recording medium 30 is not exposed, and is opened when the hologram recording medium 30 is exposed. The half mirror 33 is for separating the laser light L2 that has passed through the shutter 32 into reference light and object light. The light L3 reflected by the half mirror 33 becomes reference light, and the half mirror 33 The light L4 that has passed through becomes object light.

  In this optical system, the optical path length of the reference light reflected by the half mirror 33 and incident on the hologram recording medium 30 and the optical path length of the object light transmitted through the half mirror 33 and incident on the hologram recording medium 30 are approximately Same length. As a result, the coherence between the reference beam and the object beam is increased, and a hologram capable of obtaining a clearer reproduced image can be created.

  On the optical axis of the light L3 reflected by the half mirror 33, as an optical system for reference light, a cylindrical lens 34, a collimator lens 35 for making the reference light parallel, and parallel light from the collimator lens 35 And a total reflection mirror 36 that reflects the light beam are arranged in this order.

  The light reflected by the half mirror 33 is first made divergent light by the cylindrical lens 34. Next, the collimator lens 35 converts the light into parallel light. Thereafter, the light is reflected by the total reflection mirror 36 and is incident on the back side of the hologram recording medium 30.

  On the other hand, on the optical axis of the light L4 that has passed through the half mirror 33, a spatial filter that combines a total reflection mirror 38 that reflects the transmitted light from the half mirror 33 as an optical system for object light, and a convex lens and a pinhole. 39, a collimator lens 40 for converting object light into parallel light, a display device 41 for displaying an image to be recorded, a one-dimensional diffusion plate 42 for diffusing light transmitted through the display device 41 in the width direction of the element hologram, and primary A cylindrical lens 43 for condensing the object light transmitted through the original diffusion plate 42 on the hologram recording medium 30 and an optical function plate 45 having a one-dimensional diffusion function are arranged in this order.

  The cylindrical lens 43 condenses the object light in the parallax direction (element hologram short direction or observation horizontal direction). The optical functional plate 45 diffuses the collected object light in a one-dimensional manner in the longitudinal direction of the strip-shaped element hologram, and is for responding to the movement of the viewpoint in the longitudinal direction. For example, a lenticular lens having a fine pitch can be used as the optical function plate 45.

  Then, the light L4 transmitted through the half mirror 33 is reflected by the total reflection mirror 38 and then is diverged from the point light source by the spatial filter 39. Next, it is collimated by the collimator lens 40 and then enters the display device 41. The display device 41 is a projection-type image display device formed of, for example, a liquid crystal display, and is controlled by a control computer and displays an image based on the image data D5 sent from the control computer.

  The light transmitted through the display device 41 becomes light modulated by the image displayed on the display device 41 and is diffused by the one-dimensional diffusion plate 42. Here, the one-dimensional diffusing plate 42 diffuses the transmitted light from the display device 41 slightly in the element hologram width direction to disperse the light in the element hologram, thereby contributing to the improvement of the image quality of the hologram to be created. To do.

  At this time, the diffusing plate 42 is provided with diffusing plate moving means (not shown), which is moved randomly every time each element hologram is formed, and its position is changed for each element hologram. Thereby, it is possible to reduce noise localized at infinity when the hologram is observed.

[Hologram recording medium]
Here, the hologram recording medium 30 used in the above-described hologram master production system will be described. The hologram recording medium 30 has a configuration in which a photopolymer layer is sandwiched between glass plates, or a configuration in which a photopolymer is applied on a film.

For example, in the photopolymerization type photopolymer, in the initial state, as shown in FIG. 3A, the monomers M are uniformly dispersed in the matrix polymer. In contrast, as shown in FIG. 3B, when irradiated with light LA of 10 to 400 mJ / cm ² about the power, the monomer M is polymerized in the exposed portion. Then, as the polymer is formed, the monomer M moves from the surroundings, and the concentration of the monomer M changes depending on the location, thereby causing refractive index modulation. Thereafter, as shown in FIG. 3C, the polymerization of the monomer M is completed by irradiating the entire surface with ultraviolet light or visible light LB having a power of about 1000 mJ / cm ² . As described above, since the refractive index of the photopolymerization type photopolymer changes according to the incident light, the interference fringes (brightness and darkness) caused by the interference between the reference light and the object light are recorded as the change of the refractive index. Can do.

[Hologram stack]
An original is produced by the printer apparatus described above, and the hologram laminate according to the present invention is brought into close contact with the original, and the original is duplicated by irradiation with laser light. The hologram laminate according to the present invention has the configuration shown in FIG.

  The hologram laminate according to the present invention includes a hologram recording layer 1 made of a photosensitive material, a surface protective layer (referred to as a hard coat) 2 applied to the upper surface of the hologram recording layer 1, and a lower surface of the hologram recording layer 1. It consists of an applied blocking layer 3 (referred to as a hard coat as appropriate). The hard coats 2 and 3 are formed of an energy ray curable resin, for example, an ultraviolet curable resin. The ultraviolet curable resins of the hard coats 2 and 3 may be in a completely cured state or a semi-cured state. When a hologram laminate is configured as a seal, a separator layer (release film made of a resin such as PET) 5 exists on the lower surface of the hard coat 3 via an adhesive layer (also referred to as an adhesive layer) 4.

The hologram recording layer 1 can use, for example, a photopolymer having a refractive index N of 1.52 as a photosensitive material, and can record brightness and darkness of incident light as a difference in refractive index. The characteristics required for the hologram recording layer 1 are as follows.
High diffraction efficiency (for example, 90% or more), diffraction wavelength half width: 5 to 30 nm, high sensitivity (for example, 20 mJ / cm ² or less), low shrinkage

The hard coat 2 is provided for preventing scratches, preventing charging, forming a film shape, and stabilizing the hologram shape. The characteristics required for the hard coat 2 are as follows.
High surface hardness (to prevent scratches), low surface resistance, heat resistance (for example, 100 to 120 ° C.), low moisture absorption, good adhesion and material adhesion, optical refractive index approximately equal to photosensitive material (for example, 1 .52), low birefringence (for example, ± 15 nm (with respect to a wavelength of 633 nm)), low haze (the degree of unclear fogging on the surface or inside (in terms of appearance) is called haze), high transparency, Good surface smoothness and thin film thickness (for example, 20 μm or less)

The hard coat 3 is provided for preventing material transmission and stabilizing the hologram shape. In order for the photosensitive material to cause a chemical reaction with respect to the resin film of the separator layer 5, a hard coat 3 as a blocking layer is provided. The characteristics required for the hard coat 3 are as follows.
Solvent resistance (not subject to chemical damage by the solvent for making the photosensitive material in liquid form), heat resistance (for example, 100 to 120 ° C.), low hygroscopicity, good adhesion and material adhesion, thin film thickness (For example, 20 μm or less)

  The adhesive layer 4 is required to have good adhesiveness. The reason for the black color is to prevent the hologram image from becoming difficult to see when the background is seen through when it is attached to a product or the like.

An example of the thickness of each layer is shown below.
Hologram recording layer: 12 μm, hard coat 2: 10 μm, hard coat 3: 10 μm, adhesive layer 4: 17 μm
Total thickness t of hologram laminate: 49 μm

  In one embodiment of the present invention, the thickness of the hologram laminate, which was conventionally 100 μm or more, can be made 50 μm or less.

  In the configuration of the hologram laminate according to the present invention shown in FIG. 4, the hard coat 3 is necessary when the photosensitive material of the hologram recording layer 1 may cause a chemical reaction with the adhesive layer 4. If there is no such possibility, the hard coat 3 may be omitted. That is, as shown in FIG. 5, the hologram laminate may be composed of a hologram recording layer 1 and a hard coat 2 deposited on the upper surface of the hologram recording layer 1. With this configuration, the thickness of the hologram laminate can be further reduced.

An example of the thickness of each layer of the hologram laminate shown in FIG.
Hologram recording layer: 12 μm, hard coat 2: 10 μm, adhesive layer 17 μm,
Total thickness t of hologram laminate: 39 μm

[Method for producing hologram laminate]
Next, the manufacturing process of the hologram laminate described above will be described with reference to FIGS. 6, 7, 8 and 9. FIG. 6 shows a laminated structure of each process. 7, 8, and 9 show a series of manufacturing processes, but the series of manufacturing processes are divided for each process due to restrictions on drawing creation space.

  FIG. 7 shows a photosensitive material coating, drying, and film thickness control process. As shown in FIG. 6A, for example, a film 11 in which an energy ray curable resin such as an ultraviolet curable resin 11b constituting the hard coat 2 is applied on a release film 11a made of PET is wound in a roll shape. The ultraviolet curable resin 11b is in an uncured or semi-cured state (this state is referred to as a wet state). The release film 11a is for reinforcing the tensile strength of the ultraviolet curable resin 11b, and is peeled off and discarded when completed, as will be described later.

  The fed film 11 travels in the direction of the arrow and is wound around the circumferential surface of the roller 12. A photosensitive material such as a photopolymer 13 is applied on the ultraviolet curable resin 11b of the film by the slit die head 14 so as to have a constant film thickness. In the slit die head 14, a liquid photopolymer using an organic solvent as a solvent is supplied from a tank (not shown), and the photopolymer is applied with the width of the slit. The opening / closing of the slit and the width of the opening can be controlled by a control unit (not shown).

  The film coated with the photopolymer 13 is introduced into the drying unit 15 and dried. The organic solvent is removed by this drying. The drying unit 15 dries the photopolymer 13 by applying far infrared rays, warm air or the like to the photopolymer 13. Drying is performed to prevent the applied photopolymer 13 from sagging. After drying, the photopolymer 13 is in a wet state.

  After drying, the thickness of the photopolymer 13 is measured by the film thickness measuring device 16, and the opening amount of the slit of the slit die head 14 is controlled according to the measurement result, so that the thickness of the photopolymer 13 is controlled to be constant. The laminated structure at the stage where the application of the photopolymer 13 has been completed is shown in FIG. 6B.

  Next, replication, bonding, and curing of the ultraviolet curable resin are performed by the configuration shown in FIG. A film having a three-layer structure in which the photopolymer 13 is applied on the film 11 in which the release film 11 a and the ultraviolet curable resin 11 b are laminated is introduced into the duplicating device 17. In the duplicating device 17, the photopolymer 13 is brought into close contact with the original 18 while the film is stopped, and laser light is irradiated. Similar to the principle described with reference to FIG. 3, the interference fringes of the original 18 are replicated in the photopolymer 13 as a change in refractive index. The duplication device 17 will be described in more detail later.

  A film having the photopolymer 13 after duplication is introduced between the rollers 19a and 19b to which the film rolls. On the other hand, the roll-shaped film 20 is fed out, and the film 20 is introduced between the rollers 19 a and 19 b via the roller 21. As shown in FIG. 6C, the film 20 has a black adhesive layer 20b (corresponding to the adhesive layer 4 in FIG. 1) on a PET separator layer 20a (corresponding to the separator layer 5 in FIG. 1), for example. The ultraviolet curable resin 20c corresponding to the hard coat 3 is laminated. The ultraviolet curable resin 20c is in a wet state. In the case of producing the hologram laminate shown in FIG. 5, the film 20 has a configuration in which the ultraviolet curable resin 20c is omitted.

  The photopolymer 13 and the ultraviolet curable resin 20c are pressed against each other by the rollers 19a and 19b, and the two films are bonded to each other. Reference numeral 22 is attached to the film after being bonded. After bonding, drying is performed by the drying unit 23 as necessary. The film 22 that has passed through the drying unit 23 is irradiated with ultraviolet rays by an ultraviolet irradiation device 24. The film 22 has a laminated structure shown in FIG. 6D.

  By irradiating with ultraviolet rays, the ultraviolet curable resins 11b and 20c are brought into a semi-cured state or a completely cured state, and the hard coats 2 and 3 satisfying the required characteristics as described above are formed. The laminated structure shown in FIG. 6D basically has the configuration of the hologram laminate according to the present invention shown in FIG. 1 except for the release film 11a.

  The film 22 is transferred to the appearance inspection, die cutting and winding process shown in FIG. The defect inspection camera 25 inspects for the presence of defects. The film 22 is inserted between the rollers 26a and 26b that are in rolling contact with each other, and the release film 11a is peeled off and wound into a roll. The film 27 from which the release film 11a has been removed basically constitutes a hologram laminate.

  The film 27 is inserted between the roller 26 a and the roll cutter 26 c that are in rolling contact with each other, and the film 27 is die-cut. A notch having a depth from the ultraviolet curable resin 11b corresponding to the hard coat 2 for surface protection to the surface of the separator layer 20a, for example, is formed. A notch having a desired planar shape is formed by the roll cutter 26c by forming a cut so as to cross the width of the film or a rectangular cut. In addition, in the film 27, you may discard the unnecessary part which arose as a result of die cutting.

  The film 27 after the die cutting process is taken up by the product take-up roll 28. A film 27 (film hologram laminate) having a predetermined length is wound for each roll. With the above process, the manufacture of the hologram laminate is completed. The series of manufacturing steps described with reference to FIGS. 7, 8, and 9 are performed inline as described above. By performing the above-described series of manufacturing steps in-line, it is possible to prevent a decrease in yield due to deterioration of the photosensitive material and adhesion of foreign matters. In addition, a darkroom structure storage space for storing unexposed material is not required.

  The above-described copying apparatus 17 (see FIG. 8) will be described in more detail with reference to FIG. The duplication device 17 includes a chamber (indicated by a two-dot chain line) that seals the duplication area including the original 18, an exhaust device (not shown) that makes the entire chamber a vacuum environment, and a width of the peripheral surface that is greater than or equal to the width of the original 18. Having rollers 51, 52, 53, 54. The original 18 has a recorded hologram recording layer 18a between, for example, two glass plates. As the original plate 18, a film-like material having the same configuration as that of the hologram laminate according to the present invention may be used. The exposed surface of the photopolymer 13 of the film 22 is made to face the upper master 18. Rollers 51 to 54 are disposed on the lower surface side of the film 22.

  The rollers 51 and 54 are respectively installed on the entrance side and the exit side of the duplicating device 17, and the installation positions are fixed. The rollers 52 and 53 are installed in the vicinity of the outlet side inside the duplicating apparatus 17. The roller 52 is located below the edge on the outlet side of the original 18. The positions of the rollers 52 and 53 can be varied in the vertical direction. Further, the rollers 52 and 53 are slidable in the direction opposite to the transfer direction of the film 22 (the direction from left to right as viewed in FIG. 10).

  As shown in FIG. 10A, when the duplication region of the film 22 is positioned below the original 18, the transfer of the film 22 is stopped and the inside of the chamber is evacuated. The vacuum is used to prevent air from entering between the original 18 and the photopolymer 13 of the film 22. However, the vacuuming step may not be performed.

  Next, as shown in FIG. 10B, the rollers 52 and 53 are raised and the film 22 is lifted up. The rollers 52 and 53 are raised slightly above the position where the film 22 contacts the edge of the original 18. Accordingly, the photopolymer 13 of the film 22 is pressed against the edge of the original 18.

  Next, as shown in FIG. 10C, the rollers 52 and 53 slide, and the film 53 is pressed against the outlet side edge of the original 18 by the roller 53, and the roller 52 faces the inlet side and the edge on the inlet side of the original 18 Slide down to the position below. At the time of sliding, the photopolymer 13 of the film 22 is pressed against the original 18 by the pressure of the roller 52. As described above, since the photopolymer 13 is in a wet state, air does not enter between the photopolymer 13 and the original plate 18 without using a separate contact liquid, and the two are in close contact with each other. The laser beam 55 is irradiated from below with the photopolymer 13 and the original plate 18 in close contact with each other. The wavelength of the laser beam is the same as when recording the original plate 18.

  When a predetermined amount of laser light 55 is irradiated for a predetermined time, light and dark due to interference between reflected light (object light) from the hologram recording layer 18a of the original 18 and laser light 55 (reference light) is recorded in the photopolymer 13 as a change in refractive index. Is done. After irradiation with the laser beam 55, the ultraviolet curable resin may be completely cured by irradiating with ultraviolet rays.

  Next, as shown in FIG. 10D, the atmosphere is introduced, the outlet side roller 53 is lowered, and the film 22 is peeled from the original 18 at the outlet side edge of the original 18. When the film 22 is peeled from the original 18, the rollers 52 and 53 slide and descend, and the rollers 52 and 53 are positioned at the initial positions shown in FIG. 10A. Then, the film 22 is transferred, and the film 22 is stopped in a state where the next recording area is located on the lower surface of the original 18. Then, the same replication process as described above is performed.

  One embodiment of the present invention described above has a configuration in which the hologram laminate is attached onto the separator layer 5 via the adhesive layer 4. However, in the case of a card-like hologram, the separator layer 5 may not be used because it is laminated. FIG. 11 and FIG. 12 respectively show configuration examples in the case where lamination is performed.

  In FIG. 11, reference numeral 61 indicates a hologram laminate according to the present invention. That is, the hologram laminate 61 has a laminate structure in which the hologram recording layer 1 on which image information is recorded and the hard coats 2 and 3 are attached to both surfaces of the hologram recording layer 1. Transparent resin films 62 and 63 such as PET are disposed on both surfaces of the hologram laminate 61.

  Further, a print film 64 is disposed on the lower surface of the transparent resin film 63. The print film 64 is a resin film that is printed on the frame and whose back surface is printed in black. The hologram laminate 61, the transparent resin films 62 and 63, and the print film 64 have substantially the same shape and are bonded to each other by a method such as heat welding.

  Another example shown in FIG. 12 has a laminated structure in which a transparent resin film 72 and a print film 73 are sequentially laminated on the upper surface of the hologram laminate 71 and a white resin (PET) film 74 is arranged on the lower surface. The print film 73 is printed on the frame and the inside of the frame is transparent. The surface of the resin film 74 that is in contact with the hologram laminate 71 is a black printing surface, and characters or the like are printed on the opposite surface, that is, the back surface. The printed character is, for example, an explanatory text of a method for viewing the hologram.

2. Other Embodiments Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, when a photosensitive material is applied to an energy ray curable resin, pretreatment such as corona discharge treatment is applied to the surface of the energy ray curable resin, thereby improving the adhesion between the energy ray curable resin and the photosensitive material. You may make it high. Furthermore, although the ultraviolet curable resin is used in the above description, an electron beam curable resin, a visible light curable resin, a thermosetting resin, or the like may be used.

DESCRIPTION OF SYMBOLS 1 ... Hologram recording layer 2 ... Hard coat 3 as a surface protective layer ... Hard coat 4 as a blocking layer ... Adhesive layer 5 ... Separator layer 11a ... Release film 11b ... · UV curable resin 13 ··· Photopolymer 14 · · · Slit die head 17 · · · Duplicator 18 · · Original plate 20a · · · UV curable resin 20b as separator layer · · · Adhesive layer 20c · · · UV Cured resin 30 ... Hologram recording medium 31 ... Laser light source 41 ... Display device L3 ... Reference light L4 ... Object light

Claims (5)

A photosensitive material is applied on the energy ray curable resin,
The photosensitive material is disposed opposite to an original having a recorded hologram recording layer,
The photosensitive material is in close contact with the original plate,
A hologram replication method in which laser light is irradiated from the energy beam curable resin side to the photosensitive material and the original plate in a close contact state. A coating process in which a photosensitive material is coated on the energy ray curable resin at a constant thickness;
A replication process in which the photosensitive material is brought into close contact with a master having a recorded hologram recording layer, and the photosensitive material and the original in close contact are irradiated with laser light from the energy beam curable resin side;
A hologram production method comprising: a curing step of curing the energy beam curable resin applied to the photosensitive material.   3. The hologram production method according to claim 2, wherein the first position for performing the coating step, the second position for performing the duplication step, and the third position for performing the curing step are respectively connected in-line by a conveying means. A coating process in which a photosensitive material is coated on the energy ray curable resin at a constant thickness;
A duplication step in which the photosensitive material is brought into close contact with an original having a recorded hologram recording layer, and the photosensitive material and the original in close contact are irradiated with laser light from the first energy ray curable resin side;
A bonding step of bonding the photosensitive material and the second energy ray curable resin;
And a curing step of curing the first and second ultraviolet curable resins deposited on both sides of the photosensitive material.   The first position for performing the coating process, the second position for performing the duplication process, the third position for performing the bonding process, and the fourth position for performing the curing process are respectively connected in-line by the conveying means. The hologram production method according to claim 4.

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