JPH11212435A - Original plate for hologram copy and hologram copy method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original plate for hologram copy, which is easily produced with a high precision and can improve the quality of a hologram to be copied, and its production method. SOLUTION: With respect to an original plate 20 for hologram copy, plural hologram exposure parts 1 are formed on the same hologram recording material film for the purpose of copying the hologram on the recording material film. That is, one hologram recording material film where plural hologram exposure parts 1 are formed is used, and an area including all these hologram exposure parts 1 is irradiated with light to simultaneously produce plural holograms corresponding to plural hologram exposure parts 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hologram duplication master and a hologram duplication method.

[0002]

2. Description of the Related Art Certain desired characteristics (diffraction wavelength, diffraction angle,
In order to produce a hologram having a focal length or the like, it is necessary to determine the relative positions of the hologram recording material and the laser light source, and to accurately fix the positions to perform exposure. In order to produce a large number of holograms identical to this hologram, this troublesome positioning must be repeated many times, which requires time-consuming and troublesome work.

To solve this problem, there has been proposed a hologram manufacturing method in which a hologram recording material film is brought into close contact with a hologram master prepared in advance, and a hologram is copied by irradiating light from the hologram recording material film side ( See JP-A-9-90857: conventional example). According to this conventional example, it is said that the same hologram can be continuously copied in a large number of sheets without performing complicated positioning many times.

In recent years, the following has been proposed in order to increase the productivity of holograms. That is, as shown in FIG. 4, a plurality of hologram duplication masters 30 are sealed between the cover glass 3 and the black absorber 7. The hologram duplication master 30 has a hologram exposed portion 1 and a hologram unexposed portion 2 sandwiched between a protective layer 5 and a substrate glass 6. These hologram duplication masters 30 are arranged along the same plane and sandwiched between the protective layer 5 and the substrate glass 6 via the optical adhesive 4. By duplicating the hologram using the thus obtained laminate, a plurality of duplicate holograms can be produced at one time.

[0005]

However, since the above-mentioned laminated body requires a plurality of hologram duplication masters 30 to be arranged with high precision along the same plane, it is very difficult to manufacture them. There is. In particular, the respective hologram duplication masters 30 may be relatively displaced before the optical adhesive 4 is cured, or may be displaced due to shrinkage of the cured optical adhesive 4. is there.

The relative positional deviation of each hologram duplication master 30 complicates the masking operation and the optical axis adjustment of the hologram laser when duplicating the hologram, or the deviation of the exposure area in the duplicated hologram. This is a factor that causes a characteristic change.

Further, due to the influence of the dimensional accuracy of the substrate glass 6 and the holder (not shown) at the time of exposure, the optical centers of the individual hologram duplication masters 30 are not always the same. Generally, the dimensional accuracy of the substrate glass 6 is 0.3 m
m, and 0.1 mm is the limit even if processing is performed with high precision.

Therefore, a plurality of hologram duplication masters 30
However, there is a problem that a desired hologram cannot be copied because the optical centers of the holograms 30 are different even if the holograms are arranged at predetermined positions. Then, since the duplicated light is scattered on the boundary surface between the hologram duplication masters 30, the duplicated hologram is recorded as noise in the duplicated hologram, which causes a problem of lowering the quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of producing a hologram duplication master and a hologram duplication capable of being manufactured easily and with high precision and improving the quality of a hologram to be duplicated. It is to provide a method.

[0010]

According to a first aspect of the present invention, there is provided a hologram duplication master plate, wherein a plurality of hologram exposing portions are formed on one hologram recording material film. It is characterized by being used by being superimposed on a hologram recording material.

In this case, in the hologram duplication master according to the present invention, it is preferable that the plurality of hologram exposure portions have the same dimensions and the same optical characteristics.

On the other hand, the hologram duplication method of the present invention comprises:
As described in claim 3, a hologram for producing a duplicate hologram by superimposing a hologram duplication master on the duplication hologram recording material and irradiating light from the duplication duplication hologram recording material side or the hologram duplication original plate side. In a copying method, a plurality of hologram exposing portions formed on one hologram recording material film are used as the hologram duplicating master plate, and the light is applied to a region including all of the plurality of hologram exposing portions. Then, the duplicate holograms corresponding to the plurality of hologram exposure units are simultaneously produced.

In this case, according to the hologram duplication method of the present invention, the plurality of hologram exposing portions have the same dimensions and the same optical characteristics. It is preferable to carry out the production at the same time.

In the present invention thus configured,
A plurality of hologram exposure portions are formed on the same hologram recording material film without using an optical adhesive or the like. For this reason, like a conventional hologram duplication master,
It is possible to eliminate the possibility that the holograms may be displaced relative to each other during and after the curing of the optical adhesive.

In the present invention, a plurality of holograms are formed by moving the hologram recording material film in the plane direction and sequentially irradiating each hologram exposure section with a hologram laser. The optical center of the hologram can be made the same.

In the present invention, since a plurality of duplicate holograms are produced without arranging a plurality of holograms, a boundary surface between the holograms is not formed. As a result, the possibility of being recorded on the duplicate hologram can be eliminated.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view and a schematic cross-sectional view of a hologram duplication master according to the present invention, FIG. 2 is a schematic diagram showing a procedure for manufacturing the hologram duplication master, and FIG. 3 is a conceptual diagram showing an example of a hologram duplication method. In the embodiment described below, the members and the like already described in FIG. 4 are denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description.

In FIG. 1, a hologram duplication master 20 is shown.
Has a plurality of hologram exposure portions 1 formed on one hologram recording material film. These hologram exposure units 1 have the same optical characteristics with the same shape and dimensions,
The hologram recording material film is formed linearly at regular intervals along the longitudinal direction of the film. Such a hologram duplication master 20 is sandwiched between a protective glass 5 and a substrate glass 6 supported by a cover glass 3 and a black absorber 7 via an optical adhesive 4.

The substrate glass 6 is a substrate glass at the time of hologram exposure, and can be omitted. When the substrate glass 6 is omitted, the surface of the substrate glass 6 is preliminarily subjected to a release treatment so that the hologram can be easily peeled off after exposure. In this case, the hologram may be directly attached to the black absorber 7.

In FIG. 1, the thickness from the outermost surface of the cover glass 3 to the end face of the hologram on the side of the substrate glass 6 depends on the coherence length of an exposure light source (usually a laser) used for copying. Specifically, 1 / (coherent distance) of the light source
It is necessary to set it to 2 or less. However, if the thickness is too small, a problem occurs in mechanical strength. This thickness is preferably on the order of 1 mm to 10 mm. As an exposure light source at the time of duplication, a monochromatic light source transmitted through an interference filter can be used, but a laser having a long coherence distance is preferable. In particular, a laser whose oscillation line width is narrowed by an etalon is preferable.

The adhesive 4 preferably has high transparency and low light scattering (low haze), and preferably has low viscosity of bubbles and a viscosity that can be easily filled into uneven surfaces. At the time of bonding, it is preferable to place a weight and allow to stand for several hours in order to remove bubbles and make the adhesive layer uniform.

The curing method of the adhesive 4 is a thermosetting type,
An ultraviolet curing type, a two-component mixed curing type, a hot melt curing type (hot melt) and the like are preferable. Examples of the material of the adhesive 4 include rubber, acrylic, silicone, and hot melt. In this embodiment, the cover glass 3
Is 1.1 mm thick glass, and the protective layer 5 is P
VA (polyvinyl alcohol film), UV-curable optical adhesive (NOA manufactured by Norland, USA)
-61).

In order to prevent the components of the adhesive 4 from adversely affecting the hologram, a protective layer 5 is interposed at the interface between the hologram and the adhesive 4. As the protective layer 5, PV
A, Eval film, PET film, TAC film, etc. can be used, but do not have birefringence as much as possible.
Those having a refractive index of around 1.5 are preferred.

In the embodiment shown in FIG. 1, the black absorber 7 is provided at the interface between the hologram of the substrate glass 6 and the air on the opposite side.
This has the effect of reducing stray light due to internal reflection. In this example, privacy glass having a visible light transmittance of 30% was used as the black absorber. As a hologram recording material for masters,
Acrylic photopolymer was used. In addition, various recording materials such as a polyvinyl carbazole-based photopolymer, gelatin dichromate, a photo resist, and a silver salt can be used.

FIG. 2 shows a hologram duplication master 2 of the present invention.
0 is shown. First, hologram recording material 1 for original plate
The unmasked portion 9 is polymerized with non-coherent, for example, UV light using a mask 8 masking a predetermined number of 0s to form a hologram unexposed portion.
Since polymerization by UV light does not occur in the masked portion 11, a hologram exposure portion can be formed by exposure to coherent light in a later step (see FIG. 2A).

The hologram recording material is set on a mechanically controlled X-axis stage 14, moved by an amount corresponding to the distance between the respective masks, and sequentially irradiated with a laser beam 12 to form one recording material film. A plurality of hologram exposure portions having the same dimensions and the same optical characteristics were formed (see FIG. 2B). In this example, an X-axis stage with a mechanical accuracy of 5 μm was used. In addition, the peripheral portion of the irradiation laser light was cut so that light did not hit another portion during exposure of one portion.

The hologram for the original plate thus produced was laminated in the form shown in FIG. In the hologram duplication master 20 of the present invention, the position accuracy of each hologram is the same as that of the mask at the time of UV irradiation, and is extremely high. Further, the optical center of each hologram exposure unit 1 also depends on the mechanical accuracy of the X-axis stage, and is positioned with high accuracy within 5 μm.

The hologram is copied, for example, as follows. FIG. 3 is a conceptual diagram showing a process of performing hologram replication using the hologram replication master. Among them, the duplication hologram photosensitive material film 51 has a three-layer structure (not shown) in which the photosensitive material 52 is sandwiched between support films 53 and 54. The unwinding roller 31 on which the duplication hologram photosensitive material film 51 is set.
Hologram photosensitive material film 5 sent from
1 is cleaned through a cleaning unit 44 composed of an adhesive roller, and the support film 13 on one side is peeled off by a peeling roller 45 in the sticking / peeling head 32. The peeled support film 53 is taken up by the take-up roller 33.

On the other hand, the copy hologram photosensitive material film 51 with the surface of the photosensitive material 52 exposed is moved by moving the sticking / peeling head 32 from right to left in FIG. 3 and raising / lowering the hologram master as the subject. Is laminated on the surface of the hologram duplication master.

The reason why the support film on the hologram duplication master side is peeled off is to prevent dust and the like from being caught between the hologram duplication master and the hologram duplication master and the duplication photosensitive material. This is because the number of layers interposed between the material and the material is reduced as much as possible to eliminate influences such as internal reflection.

Next, the anti-reflection coated glass 34 is put on the hologram duplication original plate on which the duplication hologram photosensitive material film 51 is laminated via a refractive index matching liquid. After trimming with UV light, exposure is performed by irradiation with an Ar laser or the like, and a diffraction image similar to that of the hologram duplication master is recorded on the duplication photosensitive material 12.

After such duplication recording, the duplication hologram photosensitive material film 51 is peeled off from the hologram duplication master and the protective film 5 is exposed on the surface where the photosensitive material 52 is exposed.
0 are laminated by a laminating roller 38. In order to form a sufficient diffraction image on the photosensitive material, the photosensitive material is exposed to ultraviolet light by an ultraviolet irradiation device 42 and wound up by a winding roller 43.

According to the above embodiment, since there is no glass boundary as in the conventional hologram duplication master, a high-quality duplicate hologram free of noise without duplication of the duplicated light during duplication can be produced. .

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.

For example, in the embodiment described above, X
Although the axis stage has been illustrated, when the holograms are arranged in a matrix, an XY axis stage movable in a two-dimensional direction may be employed.

Further, as the hologram recording material film, an appropriate recording material such as an acrylic photopolymer or a photopolymer such as polyvinyl carbazole, a dichromated gelatin, a photo resist or a silver salt may be used.

In the above example, the method of replicating a reflection hologram has been described. However, the original hologram duplication and the method of replication of the present invention can also be used to replicate a transmission hologram. That is, when replicating a transmission hologram, the hologram duplication master is superimposed on the duplication hologram recording material, and light is irradiated from the hologram duplication master. Then, the transmission hologram is duplicated by exposing the duplication hologram recording material with the light directly transmitted through the original and the light transmitted and diffracted by the original.

In addition, materials, shapes, dimensions, forms, such as a hologram exposure section, a hologram duplication master, a masking material, and a hologram laser exemplified in the above-described embodiment,
The number, arrangement, and the like are not limited as long as the invention can be achieved.

[0039]

As described above, according to the present invention, it is possible to manufacture a hologram duplication master with high positional accuracy. As a result, masking during duplication and positioning of duplication light are facilitated, and duplication is achieved. The displacement of the exposure area of the hologram and the change in the characteristics of the duplicate hologram do not occur. Further, since a plurality of duplicate holograms are produced without arranging the plurality of holograms, scattering of the duplicate light at the boundary between the respective holograms is eliminated, and a high-quality duplicate hologram without noise can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view (A) and a schematic cross-sectional view (B) showing an example of a hologram duplication master according to the present invention.

FIG. 2 is a schematic view showing an example of a procedure for manufacturing a hologram duplication master.

FIG. 3 is a conceptual diagram showing an example of a hologram duplication method of the present invention.

FIG. 4 is a plan view (A) and a schematic cross-sectional view (B) schematically showing a conventional hologram duplication master.

[Description of Signs] 1: Hologram exposure unit 8: Masking material 12: Laser beam 20: Hologram duplication master

Claims (4)

[Claims] 1. A hologram duplication master in which a plurality of hologram exposing parts are formed on one hologram recording material film and used by being superimposed on a duplication hologram recording material during hologram duplication. 2. The hologram duplication master according to claim 1, wherein the plurality of hologram exposure portions have the same dimensions and the same optical characteristics. 3. A hologram duplication method in which a hologram duplication master is superimposed on a duplication hologram recording material, and light is irradiated from the duplication duplication hologram recording material side or the hologram duplication master side to produce a duplicate hologram. Using, as the hologram duplication master, a plurality of hologram exposure units formed on a single hologram recording material film, irradiating the light to an area including all of the plurality of hologram exposure units, A hologram duplication method, comprising simultaneously producing duplicate holograms corresponding to a plurality of hologram exposure units. 4. The hologram duplicating method according to claim 3, wherein the plurality of hologram exposing sections have the same dimensions and the same optical characteristics, and simultaneously produce a plurality of duplicate holograms.