JP2002014598A - Hologram original plate and method for making the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hologram original plate of multilayouts which allows the use of the original plates having good characteristics as holograms of respective surfaces, may be duplicated with good efficiently and is highly durable and a method for making the same. SOLUTION: This hologram original plate is the hologram original plate 25 juxtaposed with plural unit hologram original plates 20 and in which the surfaces of the juxtaposed plural unit hologram original plates 20 are covered with one sheet of common transversely thin sheet 21 by means of adhesives 22.

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 applicant of the present invention has proposed a color filter using a hologram in Japanese Patent Application No. 5-12170 or the like in order to greatly improve the efficiency of using a backlight for a liquid crystal display. This hologram color filter basically consists of an array of transmissive light-collecting element holograms that diffract parallel light incident at a specific wavelength at a specific oblique angle of incidence so as to converge at a specific focal length position. It becomes.

In order to copy a hologram array having similar characteristics by using a hologram array method using such a hologram array as an original, for example, a computer generated hologram (CG)
H), a first master is produced, and then the first master is duplicated by a hologram duplication method to produce a hologram original, and a final product is duplicated from the hologram original by a similar hologram duplication method. Has been taken.

[0004] As a method of duplicating the above-mentioned transmission type light-collecting element hologram array, the present applicant has filed Japanese Patent Application No. Hei.
No. 49115, a method of duplicating a hologram having the same characteristics as the original by setting the distance between the original and the hologram photosensitive material to approximately twice the focal length of the element hologram when copying from the first original and the hologram original Suggested. Hereinafter, this method will be briefly described.

FIG. 7 is a view for explaining a method for producing a hologram array constituting a hologram color filter from a CGH array master 7 in one copy. The original of the hologram array constituting the hologram color filter is configured as a CGH array 7, and the distance from the relief surface of the CGH array original 7 to the photosensitive layer 13 is set to each CGH array.
The hologram sensitive material 8 is set at a distance 2f, which is twice the focal length f of GH5 ″, and is separated from the original CGH array 7.
A laser beam 9 having a specific wavelength is incident from the GH array master 7 at a specific incident angle θ, and each CGH of the CGH array master 7 is
The diffracted light 10 that has been diffracted by 5 ″ and converted from the convergent light to the divergent light and the linearly transmitted light 11
Duplicate with interference in 3.

In this case, assuming that the diameter of the recording area of each element hologram 5 ″ of the CGH array master 7 is D, the diffraction light 10
Once converges from the relief surface of each CGH 5 ″ to a position P of f and becomes a divergent light beam of the same diameter D at a position 2f. Therefore, if the photosensitive layer 13 is arranged at this position and interferes with the straight transmitted light 11, , The diameter of the recording area of the hologram interference fringes is the same D, and the pitch between the copied element holograms is also C.
The pitch is the same as the pitch between the element holograms 5 ″ of the GH array master 7. In addition, the hologram array copied in this way proceeds from the glass substrate 12 side in the direction opposite to the transmitted light 11 when the hologram array is copied. When light in the direction is incident, the photosensitive layer 1 on which hologram interference fringes are recorded
The diffracted light is condensed at a position P at a distance f from 3 and becomes the same as the focal length of the element hologram 5 ″ of the CGH array original 7.
That is, the hologram array completely identical to the CGH array master 7 is copied.

The hologram array obtained by copying from the CGH array master 7 in the arrangement shown in FIG. 7 is similarly copied as a hologram master to obtain a final product. FIG. 8 shows an arrangement for performing such a second copy. In the drawing, a hologram array obtained by duplication in the arrangement of FIG. 7 is referred to as an intermediate hologram array H1.
The original is used as an original, and the duplication is performed again. In this case, the hologram sensitive material 8 is arranged on the side of the original 7 when the intermediate hologram array H1 is duplicated, and a laser beam 9 'for reproduction illumination is provided.
Is incident on the opposite side of the hologram sensitive material 8 in a direction that advances in the direction opposite to the transmitted light 11 when the intermediate hologram array H1 is duplicated. Then, the intermediate hologram array H1
Is set to 2f, which is twice as long as the focal length f of the element hologram, from the diffraction surface of (1) to the photosensitive layer 13 of the hologram photosensitive material 8. In this arrangement, when the laser beam 9 'for reproduction illumination is incident on the intermediate hologram array H1, the light 1 diffracted from each element hologram of the intermediate hologram array H1 is obtained.
0 ′ travels in the opposite direction to the diffracted light 10 in FIG. 7 and once converges to become a divergent light beam having the same diameter D at the position 2f. Therefore, as in the case of FIG. 7, the diffracted light 10 ′ and the straight transmitted light 11 ′ interfere with each other in the photosensitive layer 13 disposed at this position,
An array of element holograms having the same focal length f is copied and recorded in the area having the same diameter D at the pitch D.

According to this method, there is a feature that a hologram having the same characteristics as the original can be produced without completely bringing the original into close contact with the duplicate. Hereinafter, the hologram duplication method using the above arrangement will be referred to as a double focal point duplication method.

In the present invention, a hologram (intermediate hologram array H1) used for duplicating a final product is referred to as a hologram master. In the case of the hologram master, for example, the hologram master is used for one screen. If a hologram master having only one corresponding hologram (hologram color filter) is prepared and copied, the duplication efficiency is not good.

Therefore, conventionally, the CGH master 7 is copied a plurality of times while moving the CGH master 7 in parallel to one large hologram photosensitive material 8 to expose, for example, four or eight holograms to expose four or eight holograms. A method is used in which a hologram master in which the same number of holograms are arranged is prepared, and the number of holograms is simultaneously copied in one copy. A hologram master in which a plurality of holograms are arranged in parallel in one hologram master is called a multi-faced hologram master.

[0011]

However, as described above, when a multi-faced hologram master is produced from a CGH master multiple times with respect to one large hologram photosensitive material, a plurality of exposures (CGHs) are performed. If the hologram is not properly copied even once during the original copy, the multi-faced hologram master cannot be used or cannot be a hologram master for efficient duplication.

The present invention has been made in view of such a problem of the prior art, and an object thereof is to use a hologram having good characteristics as a hologram on each surface, to enable efficient duplication, and to improve durability. An object of the present invention is to provide a multi-faced hologram master having excellent properties and a method for producing the same.

[0013]

According to the present invention, there is provided a hologram master comprising a plurality of unit hologram masters arranged in parallel, wherein the surface of the plurality of unit hologram masters arranged in parallel is provided with an adhesive. And is covered by one common transparent thin plate.

In this case, it is desirable that the unit hologram master has a hologram recorded on a photosensitive material layer on a transparent substrate and has a protective layer thereon.

It is preferable that a transparent thin plate for each unit hologram master is adhered on the protective layer.

Preferably, the plurality of unit hologram masters are hologram duplicates of the same hologram master.

The unit hologram master includes, for example, a hologram color filter.

In the method for producing a hologram master according to the present invention, in the method for producing a hologram master as described above, a step of producing a plurality of unit hologram masters and a step of bonding an adhesive on a transparent thin plate adsorbed on a reference plate surface. Attaching the plurality of unit hologram originals in parallel, attaching a base plate to the back side of the plurality of unit hologram originals via an adhesive, and adsorbing the reference plate and the transparent thin plate. And releasing the reference plate from the transparent thin plate.

In this case, in the step of manufacturing a plurality of unit hologram masters, it is desirable to manufacture a plurality of unit hologram masters by hologram duplication from the same hologram master.

In the present invention, since the surfaces of a plurality of unit hologram masters arranged in parallel are covered with a single transparent thin plate via an adhesive, the heights between the unit hologram masters are made uniform. Thus, any of the multi-sided holograms can be accurately duplicated. Also, when a hologram photosensitive material is brought into close contact with the multi-faced hologram master via an index matching liquid to perform hologram duplication,
It does not occur that the index matching solution dissolves the optical adhesive between the unit hologram masters. Further, by using a glass plate as the transparent thin plate, the durability becomes good. Further, the hologram master according to the present invention
In the manufacturing process, since only unit hologram masters having good characteristics and being aligned with each other are selected and pasted, the holograms on all surfaces of the completed multi-faced hologram master have high quality and uniform characteristics, and are thus efficient. Can be used for replication.

[0021]

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.

FIG. 1 to FIG. 6 are cross-sectional views showing steps of a method for manufacturing a hologram master according to an embodiment of the present invention.

First, a plurality of duplications in which one hologram is performed a plurality of times by one duplication from the CGH original (first original) 7 as shown in FIG. 7 are performed. To this end, as shown in FIG. 1, 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 also serving as a coloring layer for preventing
This hologram photosensitive material is arranged in close contact with the array master 7 or at a distance of twice the focal length f as shown in FIG. 7, and when the CGH master 7 is a transmission type, the hologram sensitive material is placed from the CGH master 7 side. In the case where the CGH master 7 is of a reflection type, duplicate illumination light (corresponding to the laser beam 9 in FIG. 7) is incident from the hologram sensitive material side, and in the photosensitive material layer 2, when the CGH master 7 is of a transmission type. The transmitted light and the diffracted light are made to interfere with the incident light and the diffracted light when the CGH master 7 is of a reflection type, so that the CGH master 7 is holographically copied.

Next, as shown in FIG. 2, the PVA layer 3 of each hologram photosensitive material obtained by holographically duplicating the CGH master 7 was used.
A thin glass 5 is stuck on top with an optical adhesive 4,
A plurality of unit hologram masters 20 having similar characteristics are manufactured. At this time, when applying the 2x focus replication method, PVA
It is desirable that the total thickness of the layer 3, the optical adhesive 4, and the thin glass 5 be selected to be equal to or less than the focal length f.

Next, as shown in FIG. 3, a thin glass sheet 21 having a large area is vacuum-adhered to the optical flat surface of the reference glass 30 having the optical flat surface. In the case of applying the double focal point replication method, the thin glass 21
Is desirably selected to be less than or equal to the focal length f. A plurality of unit hologram masters 20 are aligned on the vacuum-contacted thin glass plate 21 by using an optical adhesive 22 and are bonded so as to have the same height with the same force. After the step of FIG. 2, the unit hologram master 20 is subjected to dicing or the like.
If the end faces of the four sides are cut, and especially 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 trimmed, the unit shown in FIG. Bubbles are less likely to enter the joint between the hologram masters 20, and the positional accuracy can be improved.

Next, as shown in FIG. 4, a solvent (index matching solution) is applied to the gap between the unit hologram masters 20 using an optical adhesive 24 on the back side of the aligned unit hologram masters 20 for reinforcement. ) Is adhered to the base glass 23 in order to prevent intrusion. At this time, the gap between the unit hologram masters 20 is surely filled with the optical adhesive 24. This is because if there is a gap between the unit hologram masters 20, when illumination light for duplication is obliquely incident, reflection and scattering occur in the gap, and there is a possibility that unnecessary interference fringes may be formed.

Next, as shown in FIG.
After sufficiently curing, etc., 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. The multi-faced hologram master 25 according to one embodiment of the present invention is completed.

The multi-faced hologram master 25 according to the present invention
As described above, the surfaces of a plurality of aligned unit hologram masters 20 constituting the same are shared by a single thin glass 21.
, The heights between the unit hologram masters 20 can be equalized, and any multi-sided hologram can be accurately copied. Further, when a hologram photosensitive material is brought into close contact with the multi-faced hologram master 25 via an index matching liquid to perform hologram replication,
Since the optical adhesive 22 between the unit hologram masters 20 is covered with the thin glass 21, the index matching liquid (for example, xylene) does not dissolve.

Further, in the multi-faced hologram master 25 according to the present invention, only the unit hologram masters 20 having good characteristics and being aligned with each other are selected and pasted in the manufacturing process.
Since the holograms of all the surfaces have good quality and uniform characteristics, they can be used for efficient duplication.

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 of a transmission type or a reflection type, and the multi-faced hologram master 25 need not necessarily be copied by the double focal point copying method.

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

[0033]

As is clear from the above description, according to the hologram master of the present invention and the method of manufacturing the same, the surfaces of the plurality of unit hologram masters arranged in parallel are formed by a single transparent thin plate via an adhesive. Since the holograms are covered, the heights between the unit hologram masters can be equalized, and any multi-sided hologram can be accurately copied. Also,
When hologram duplication is performed by closely attaching a hologram photosensitive material to the multi-faced hologram master via an index matching liquid, the index matching liquid does not dissolve the optical adhesive between the unit hologram masters. Further, by using a glass plate as the transparent thin plate, the durability becomes good. Further, in the hologram master according to the present invention, in the manufacturing process, only unit hologram masters having good characteristics and being aligned with each other are selected and pasted, so that the holograms of all surfaces of the finished multi-faced hologram master are of high quality. Since the characteristics are uniform, it can be used for efficient duplication.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the first step of carrying out a method for producing a hologram master according to one embodiment of the present invention.

FIG. 2 is a sectional view of a step following FIG. 1;

FIG. 3 is a sectional view of a step following FIG. 2;

FIG. 4 is a sectional view of a step following FIG. 3;

FIG. 5 is a sectional view of a step following FIG. 4;

FIG. 6 is a cross-sectional view of a multi-faced hologram master according to one embodiment of the present invention.

FIG. 7 is a diagram showing an arrangement for performing hologram duplication from a CGH array original by a conventional double focal point duplication method.

8 is a diagram showing an arrangement for performing replication again using the duplicate hologram obtained in the arrangement of FIG. 7 as an original.

[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 5 "... CGH 7 ... CGH array original plate 8 ... Hologram sensitive material 9 ... Laser beam 9 '... Laser light 10: Convergent diffracted light 10 '... Divergent diffracted light 11 ... Straight transmitted light 11' ... Straight transmitted light 12 ... Glass substrate 13 ... Photosensitive layer 20 ... Unit hologram master 21 ... Thin glass 22 ... Optical adhesive 23 ... Base glass 24 optical adhesive 25 hologram master (present invention) 30 reference glass H1 intermediate hologram array

Claims (7)

[Claims] 1. A hologram master in which a plurality of unit hologram masters are arranged in parallel, wherein the surfaces of the plurality of unit hologram masters arranged in parallel are covered with one common transparent thin plate via an adhesive. The hologram master. 2. The hologram master according to claim 1, wherein the unit hologram master has a hologram recorded on a photosensitive material layer on a transparent substrate, and has a protective layer thereon. 3. A transparent thin plate for each unit hologram master is adhered on the protective layer.
The hologram master described. 4. The hologram master according to claim 1, wherein the plurality of unit hologram masters are hologram duplicated from the same hologram master. 5. The hologram master according to claim 1, wherein the unit hologram master comprises a hologram color filter. 6. A method for manufacturing a hologram master in which the surfaces of a plurality of unit hologram masters arranged in parallel are covered with one common transparent thin plate via an adhesive, comprising: a step of manufacturing a plurality of unit hologram masters; A step of bonding the plurality of unit hologram masters in parallel on a transparent thin plate adsorbed on a reference plate surface via an adhesive, and a step of bonding the plurality of unit hologram masters arranged in parallel on the rear side via an adhesive. A method for producing a hologram master, comprising: a step of bonding a base plate; and a step of releasing adsorption of the adsorbed reference plate and the transparent thin plate and peeling the reference plate and the transparent thin plate. 7. The method for manufacturing a hologram master according to claim 6, wherein in the step of manufacturing a plurality of unit hologram masters, the plurality of unit hologram masters are manufactured by hologram duplication from the same hologram master.