JP2002341731A - Hologram master plate and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-face hologram master plate in which no crack is produced even when the thickness varies in the unit hologram master plates and which prevents defective duplicated products from being generated. SOLUTION: The hologram master plate is produced by arranging a plurality of unit hologram master plates 20 in a line, covering the surfaces of the plurality of unit hologram master plates 20 arranged in a line with a common single sheet of a transparent thin plate 21 with an adhesive 22, and sticking a common single sheet of a base plate 23 with another adhesive 24 to the back face side of the plurality of unit hologram master plates 20 arranged. In this master plate, the maximum thickness D of the layer of the second adhesive 24 in the region of the plurality of unit hologram master plates 20 is twice or more as the maximum level difference Δ due to the difference in the thickness of the plurality of unit hologram master plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hologram master and a method of manufacturing the same, and more particularly, to a multi-faced hologram master and a method of manufacturing the same.

[0002]

2. Description of the Related Art The present applicant has filed Japanese Patent Application No. 2000-12607.
7 and the like propose a hologram master used for replicating a hologram product such as a hologram color filter, which is a multi-faced hologram master in which a plurality of unit hologram masters are adhered in parallel on a base glass. Hereinafter, description will be made based on a manufacturing method.

First, for example, a single hologram is copied a plurality of times in a single copy from a CGH master (first master), and a plurality of copies are performed. For this purpose, as shown in FIG. 3, a photosensitive material layer 2 such as a photopolymer is provided on a substrate glass 1 having a size corresponding to the size of a hologram, and a protective layer is formed thereon to generate unnecessary interference fringes due to multiple interference. A hologram photosensitive material provided with a PVA (polyvinyl alcohol) layer 3 which also serves as a coloring layer for preventing bleeding is prepared and adheres to the CGH array original plate 7 or as disclosed in Japanese Patent Application No. 7-24.
As shown in No. 9115, this hologram sensitive material is arranged at a distance of twice the focal length f, and when the first original is a transmission type,
When the first master is of a reflective type, duplicate illumination light is incident from the hologram sensitive material side from the first master side, and transmitted light and diffracted light in the photosensitive material layer 2 when the first master is of a transmission type. Is the first
If the original is reflective, the incident light and the diffracted light interfere
Copy the hologram from the original.

[0004] Next, as shown in FIG. 4, a thin glass plate 5 is bonded with an optical adhesive 4 onto the PVA layer 3 of each hologram photosensitive material obtained by holographically duplicating the first master. Thereafter, if necessary, the end faces of the substrate glass 1, the photosensitive material layer 2, the PVA layer 3, the optical adhesive 4, and the thin glass 5 are cut and arranged by dicing or the like as shown in FIG. A unit hologram master 20 having the same characteristics as described above is produced.

Next, as shown in FIG. 6, a thin glass plate 21 having a large area is vacuum-contacted on the optical flat surface of a reference glass 30 having an optical flat surface. A plurality of unit hologram masters 20 are aligned on the vacuum-attached thin plate glass 21 using an ultraviolet-curable optical adhesive 22 and are pasted to the same height with the same force. Then, the optical adhesive 22 is irradiated with ultraviolet rays to be cured.

Next, as shown in FIG. 7, a base glass 23 serving as a substrate of a multi-faced original is bonded to the rear side of the aligned unit hologram original 20 using an ultraviolet curing optical adhesive 24. Then, the optical adhesive 24 is irradiated with ultraviolet rays to be cured. At this time, the gap between the unit hologram masters 20 is surely filled with the optical adhesive 24. If there are gaps or bubbles between the unit hologram masters 20, when illumination light for duplication is obliquely incident, reflection and scattering occur in the gaps, which may form unnecessary interference fringes. is there.

[0007] Next, as shown in FIG.
After sufficiently hardening, the suction between the reference glass 30 and the thin glass 21 adhered in vacuum is released, and the reference glass 30 and the thin glass 21 are peeled off. The attached hologram master 25 is completed.

[0008]

However, in the unit hologram master 20 as described above, as shown in FIG. 10, due to the variation in the thickness of the substrate glass 1 or the like, the unit to be multi-faced on one base glass 23 is used. The thickness of the hologram master 20 may vary, and a step may occur between the unit hologram masters 20 arranged in parallel. When a step occurs between the unit hologram masters 20 in this way, a difference also occurs in the thickness of the optical adhesive 24 existing between the base glass 23 and the upper surface of the unit hologram master 20. The ultraviolet-curable optical adhesive 24 shrinks slightly when irradiated with ultraviolet light and cured. Then, since the contraction amount is different between the position where the layer of the optical adhesive 24 is thick and the position where the layer of the optical adhesive 24 is thin, as shown schematically in FIG.
Cracks may be formed near the boundary on the thick side. If a crack is formed, the portion becomes scattered, so that the duplicated product becomes defective particularly when the multi-faced hologram master 25 is a master for copying a transmission hologram.

Further, in the step of attaching the unit hologram master 20 shown in FIG. 6, even if the unit hologram master 20 is applied by applying the same force, if the optical adhesive 22 has a high viscosity, In some cases, the thicknesses of the layers 22 are not uniform, resulting in a variation and a difference in the height of the unit hologram master 20. If there is a difference in height between the unit hologram masters 20, there will be variations in the characteristics between the products copied from the unit hologram masters 20 of the multi-faced hologram master 25.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to prevent the occurrence of cracks even if the thickness of a unit hologram master varies, and also to prevent the unit hologram master from being in close contact with the master. It is an object of the present invention to provide a multi-faced hologram master in which the unit hologram masters have the same height, do not cause a defect in a duplicate product, and have no variation in characteristics, and a method of manufacturing the same.

[0011]

A hologram master according to the present invention that achieves the above object comprises a plurality of unit hologram masters arranged in parallel, and the surfaces of the plurality of unit hologram masters arranged in parallel are shared by an adhesive. The hologram master, which is covered with one transparent thin plate and has a common base plate bonded to the back side of the plurality of unit hologram masters arranged in parallel via another adhesive, The maximum thickness in the area of the plurality of unit hologram masters of another adhesive layer is at least twice the maximum step due to the thickness difference between the plurality of unit hologram masters. Is what you do.

In the method for producing a hologram master according to the present invention, a plurality of unit hologram masters are arranged in parallel, and the surfaces of the plurality of unit hologram masters arranged in parallel are covered with a single transparent thin plate via an adhesive. And a method for producing a hologram master in which a common base plate is adhered to the back side of the plurality of unit hologram masters arranged in parallel via another adhesive. A first step of manufacturing a plurality of unit holograms, a second step of attaching the plurality of unit hologram masters in parallel on a transparent thin plate adsorbed on a reference plate surface via an adhesive, and the plurality of unit holograms arranged in parallel A third step of adhering the base plate to the back side of the original via another adhesive, and a fourth step of releasing the adsorbed reference plate and the transparent thin plate to separate the reference plate and the transparent thin plate. Hologram including In a method for manufacturing a precursor, the third
In the step, a maximum thickness of the another adhesive layer in a region of the plurality of unit hologram masters is set to be twice or more a maximum step due to a thickness difference between the plurality of unit hologram masters. And setting the thickness of the another adhesive layer.

According to another method of manufacturing a hologram master of the present invention, a plurality of unit hologram masters are arranged in parallel,
The surfaces of the plurality of unit hologram masters arranged in parallel are covered with one common transparent thin plate via an adhesive, and another adhesive is provided on the back side of the plurality of unit hologram masters arranged in parallel. A method for producing a hologram master in which one common base plate is adhered, comprising: a first step of producing a plurality of unit hologram masters; and an adhesive on a transparent thin plate adsorbed on a reference plate surface. A second step of attaching the plurality of unit hologram masters side by side and attaching the base plate to the back side of the plurality of unit hologram masters arranged in parallel with another adhesive, A hologram master including a fourth step of releasing the suction between the reference plate and the transparent thin plate and separating the reference plate and the transparent thin plate, wherein in the second step, at least the adhesive is heated, of Position is a method characterized in that pasting by parallel hologram master.

In this case, it is desirable to heat the adhesive to a temperature between 30 ° C. and 60 ° C. in the second step.

In the third step, the maximum thickness of another adhesive layer in the region of the plurality of unit hologram masters is at least twice the maximum step due to the thickness difference between the plurality of unit hologram masters. It is desirable to set the thickness of another adhesive layer so that

In the present invention, the maximum thickness in the region of the unit hologram masters of another adhesive layer for bonding one common base plate to the back side of the unit hologram masters arranged in parallel is provided. The thickness of the separate adhesive layer is set so that the thickness of the separate adhesive layer is at least twice the maximum step due to the thickness difference between the unit hologram masters. There is no crack in another adhesive layer, and particularly in the case of an original for duplicating a transmission hologram, defective products are less likely to appear in the duplicated hologram. Also, if the adhesive is heated, a plurality of unit hologram masters are pasted in parallel on a transparent thin plate, so that the unit hologram masters are aligned at the same height,
Variations in characteristics are less likely to occur between the copied holograms.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hologram master of the present invention and a method for producing the same will be described based on examples.

A process for producing a hologram master according to the present invention;
Basically, there is no difference from the steps shown in FIGS. That is, first, for example, a single hologram is copied a plurality of times in a single copy from the CGH master (first master), and a plurality of copies are performed. To do this, as shown in FIG.
A photosensitive material layer 2 such as a photopolymer is provided on a substrate glass 1 having a size corresponding to the size of the hologram, and a protective layer and a PVA (coloring layer) that serves as a colored layer for preventing generation of unnecessary interference fringes due to multiple interference are provided thereon. A hologram photosensitive material provided with a (polyvinyl alcohol) layer 3 is prepared, and a CGH array master 7 is prepared.
Or in Japanese Patent Application No. 7-24911
As shown in No. 5, this hologram light-sensitive material is arranged at a distance of twice the focal length f. Duplicate illumination light is incident from the light-sensitive material side, and in the photosensitive material layer 2, transmitted light and diffracted light are transmitted when the first original is a transmission type, and incident light and diffracted light are transmitted when the first original is a reflection type. The first master is holographically duplicated by causing interference.

Next, as shown in FIG. 4, a thin glass plate 5 is bonded with an optical adhesive 4 onto the PVA layer 3 of each hologram photosensitive material obtained by hologram duplication of the first master. Thereafter, if necessary, the end faces of the substrate glass 1, the photosensitive material layer 2, the PVA layer 3, the optical adhesive 4, and the thin glass 5 are cut and arranged by dicing or the like as shown in FIG. A unit hologram master 20 having the same characteristics as described above is produced.

Next, as shown in FIG. 6, a thin glass plate 21 having a large area is vacuum adhered on the optical flat surface of the reference glass 30 having the optical flat surface. A plurality of unit hologram masters 20 are aligned on the vacuum-attached thin plate glass 21 using an ultraviolet-curable optical adhesive 22 and are pasted to the same height with the same force. Then, the optical adhesive 22 is irradiated with ultraviolet rays to be cured.

In this step, according to the present invention, FIG.
As shown in (1), the unit hologram master 20 is placed on the reference glass 30 while a heating source 31 such as a hot plate is arranged and the optical adhesive 22 is heated via the reference glass 30 and the thin glass 21. Then, the same unit hologram master 20 is applied to each unit hologram master 20 so as to apply the same force so as to have the same height, and the optical adhesive 22 is irradiated with ultraviolet rays to be cured. Here, the reason for heating the optical adhesive 22 is as follows.
If the temperature is low, the viscosity is high, and it is not always easy to make each unit hologram master 20 have the same height even if the same force is applied. Therefore, the optical adhesive 22 is heated to some extent to reduce its viscosity. This is to apply the same force to make the height the same.

As a specific example, a force applied to each unit hologram master 20 is 40 kgf / cm ² using an ultraviolet curing optical adhesive Norland NOA65 (trade name).
At a temperature of 20 ° C., the thickness of the optical adhesive 22 was in a range of 5 to 10 μm and there was in-plane variation, and the optical adhesive 22 could not be aligned at the same height. The thickness of the adhesive 22 became 2 to 3 μm, and the unit hologram masters 20 could have the same height without any in-plane variation. When the heating temperature is set to 60 ° C., it is preferable in order to make the height of each unit hologram master 20 uniform, but the hologram interference fringes in the photosensitive material layer 2 of each unit hologram master 20 change. It is not preferable to set the heating temperature. That is, it is desirable that the optical adhesive 22 is heated to a temperature range of 30 ° C. to 60 ° C., and the unit hologram master 20 is attached and cured. The same result is obtained by using the UV-curable optical adhesive XNR5507F (Nagase Chiba Co., Ltd.) as the optical adhesive 22.

After aligning and bonding the unit hologram masters 20 in this way, as shown in FIG. 7, an ultraviolet-curable optical adhesive 24 is dropped on the rear side of the aligned unit hologram masters 20, and The base glass 23 is left standing for stabilization, and the optical adhesive 24 is irradiated with ultraviolet rays to be cured. At this time, the thickness of the optical adhesive 24 was controlled by changing the amount of the optical adhesive 22. Figure 1 and its thickness
The relationship with the occurrence of cracks as shown in FIG. The result is shown in FIG. However, the vertical axis of FIG. 2 indicates the unit hologram master 2 of the layer of the optical adhesive 24 as shown in FIG.
0 indicates the maximum thickness D, the abscissa indicates the maximum step Δ between the unit hologram masters 20, and the black circles indicate examples in which no cracks occurred. The marks indicate examples in which cracks occurred. In this case, the optical adhesive 2
No. 4 UV-curable optical adhesive Norland NO
A65 (trade name) is used.

As is apparent from FIG. 2, the maximum thickness D of the layer of the optical adhesive 24 in the region of the plurality of unit hologram masters 20 is the maximum step Δ due to the difference in thickness between the unit hologram masters 20. It was found that when the ratio was approximately twice or more, the crack shown in FIG. 10 did not occur in the completed multi-faced hologram master 25 (FIG. 9). This tendency was the same in the case where another ultraviolet-curable optical adhesive XNR5507F (Nagase Chiba Co., Ltd.) was used as the optical adhesive 24.

Therefore, the maximum thickness D of the layer of the optical adhesive 24 after curing as shown in FIGS. 1 and 7 in the region of the plurality of unit hologram masters 20 is determined by the thickness between the unit hologram masters 20. It is understood that it is desirable to set the difference to be at least twice the maximum step Δ due to the difference between.

After this, as shown in FIG. 8, when the suction between the reference glass 30 and the thin glass 21 which are in close contact with each other in vacuum is released and the reference glass 30 and the thin glass 21 are peeled off, FIG. A hologram master 25 having a cross section as shown in FIG.

The hologram master 25 with multiple faces according to the present invention
In this way, each unit hologram master 2
Since the heights of 0 are set to be the same, the characteristics hardly vary between holograms of a duplicate product copied from one multi-faced hologram master 25. In addition, the maximum thickness D of the layer of the optical adhesive 24 in the region of the plurality of unit hologram masters 20 is set to at least twice the maximum step Δ due to the difference in thickness between the unit hologram masters 20. Cracks do not occur in the optical adhesive 24 of the multi-faced hologram master 25, and defective products are less likely to appear in the copied hologram, especially when the master is for replicating a transmission hologram.

In the above embodiment, the PVA layer 3 or the thin glass 5 of the unit hologram master 20 may be omitted. The hologram to be copied may be a transmission type or a reflection type.

Although the hologram master of the present invention and the method of manufacturing the same have been described based on the embodiments, the present invention is not limited to these embodiments, and various modifications are possible.

[0030]

As is apparent from the above description, according to the hologram master and the method of manufacturing the same according to the present invention, a common base plate is bonded to the back side of a plurality of unit hologram masters arranged in parallel. The other adhesive is provided such that the maximum thickness of the layer of another adhesive in the region of the unit hologram masters is at least twice the maximum step due to the thickness difference between the unit hologram masters. Since the thickness of the layer is set,
Cracks do not occur in the other adhesive layer of the finished multi-faced hologram master, and in the case of a master for duplicating a transmission hologram, defective products are less likely to appear in the copied hologram. In addition, if the adhesive is heated, a plurality of unit hologram masters are pasted in parallel on a transparent thin plate, so that the unit hologram masters are aligned at the same height, and the characteristics do not easily vary among the copied holograms. Become.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a hologram master according to the present invention and a method for producing the same.

FIG. 2 is a diagram showing the result of examining the relationship between the thickness of an optical adhesive for bonding a base glass and the occurrence of cracks.

FIG. 3 is a cross-sectional view of the first step of the method for producing a hologram master according to the present invention.

FIG. 4 is a sectional view of a step following FIG. 1;

FIG. 5 is a sectional view of a step following FIG. 2;

FIG. 6 is a sectional view of a step following FIG. 3;

FIG. 7 is a sectional view of a step following FIG. 4;

FIG. 8 is a sectional view of a step following FIG. 5;

FIG. 9 is a sectional view of a hologram master according to the present invention.

FIG. 10 is a view for explaining cracks caused by thickness variations between unit hologram masters to be multi-faced.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate glass 2 ... Photosensitive material layer 3 ... PVA layer (protective layer + coloring layer) 4 ... Optical adhesive 5 ... Thin glass 20 ... Unit hologram master 21 ... Thin glass 22 ... Optical adhesive 23 ... Base glass 24 ... Optical Adhesive 25 hologram master 30 reference glass 31 heating source

Claims (5)

[Claims] 1. A plurality of unit hologram masters are juxtaposed, and the surfaces of the juxtaposed unit hologram masters are covered with a common transparent thin plate via an adhesive, and are arranged in parallel. In a hologram master in which a common base plate is adhered to the back side of the plurality of unit hologram masters via another adhesive, an area of the plurality of unit hologram masters in a layer of the another adhesive is used. Wherein the maximum thickness of the hologram master is at least twice the maximum step due to the thickness difference between the unit hologram masters. 2. A plurality of unit hologram masters are juxtaposed, and the surfaces of the juxtaposed unit hologram masters are covered with a common transparent thin plate via an adhesive, and are arranged in parallel. A method of manufacturing a hologram master in which a common base plate is bonded to the back side of the plurality of unit hologram masters via another adhesive, a first step of manufacturing a plurality of unit hologram masters, A second method in which the plurality of unit hologram masters are attached in parallel on a transparent thin plate adsorbed on a reference plate surface via an adhesive.
A third step of bonding a base plate to the back side of the plurality of unit hologram masters arranged in parallel with another adhesive, and releasing the suction of the sucked reference plate and the transparent thin plate; And a fourth step of peeling the transparent thin plate, wherein in the third step, the maximum thickness of the another adhesive layer in the region of the plurality of unit hologram masters is the plurality of hologram masters. A method of manufacturing a hologram master, wherein the thickness of the another adhesive layer is set so as to be at least twice the maximum step due to the difference in thickness between the unit hologram masters. 3. A plurality of unit hologram masters are juxtaposed, and the surfaces of the juxtaposed unit hologram masters are covered with a single transparent thin plate via an adhesive, and are arranged in parallel. A method of manufacturing a hologram master in which a common base plate is bonded to the back side of the plurality of unit hologram masters via another adhesive, a first step of manufacturing a plurality of unit hologram masters, A second method in which the plurality of unit hologram masters are attached in parallel on a transparent thin plate adsorbed on a reference plate surface via an adhesive.
A third step of bonding a base plate to the back side of the plurality of unit hologram masters arranged in parallel with another adhesive, and releasing the suction of the sucked reference plate and the transparent thin plate; And a fourth step of peeling the transparent thin plate, wherein in the second step, if at least the adhesive is heated, the plurality of unit hologram originals are attached in parallel. How to make a hologram master. 4. The method according to claim 2, wherein in the second step, the adhesive is
The method for producing a hologram master according to claim 3, wherein the hologram is heated to a temperature between 0C and 60C. 5. In the third step, a maximum thickness of the another adhesive layer in a region of the plurality of unit hologram masters is a maximum step due to a difference in thickness between the plurality of unit hologram masters. The thickness of the another adhesive layer is set so as to be at least twice as large as:
The method for producing the hologram master described in the above.