JP3324138B2 - Hologram manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram manufacturing method.

[0002]

2. Description of the Related Art There is an increasing need for a head-up display for a vehicle which uses a hologram to display a speed display or the like in front of a windshield of a vehicle in an enlarged manner to improve visibility. As a method of manufacturing a hologram used for such a head-up display for a vehicle, a method described in Japanese Patent Application No. 3-100099 has been devised.

In the hologram manufacturing method, in particular, when it is desired to record a plurality of interference fringes having different pitches on a hologram plate and reproduce a plurality of colors, a noise image due to undesired reflection is generated on the hologram plate as the incident angle increases. The purpose is to prevent it from being recorded. The main process is a hologram dry plate assembly 10 as shown in FIG.
0 is to be manufactured. This hologram dry plate assembly 1
As shown in FIG. 8, reference numeral 00 denotes a refractive index adjusting liquid layer (for example, silicon) on the surface of the hologram dry plate 3 (for example, soda glass 1 coated with a photosensitive agent) on the photosensitive agent layer 2 side having the photosensitive agent layer 2. A copy lens (or a reflection type master hologram) 9 is disposed in close contact with the hologram dry plate 3 via an oil) 12, while the refractive index adjusting liquid layer 8
The prism 6 is disposed in close contact with the lens, and a light reflection film (for example, an aluminum vapor-deposited film) 10 is formed on the surface of a copy lens (or reflection type master hologram) 9, and light is absorbed on the side surface 6 a of the prism 6. Film (eg black paint film)
7 is formed.

[0004]

However, when a photographic process is performed on the hologram dry plate assembly 100,
The laser light L ₁ incident from one end face 3a of the hologram dry plate 3, the laser light L ₂ reflected by the other end face 3b of the hologram dry plate 3, and the end face 9b of the lens 9 after being reflected by the light reflection film 10 of the copying lens 9 by the laser beam L ₃ reflected through the respective light-sensitive adhesive layer 2 in, the noise image is recorded it has been found.

[0005] The present invention is not limited to the hologram manufacturing method using a prism as described above, but it is an object of the present invention to solve the above-mentioned problem and prevent a noise image from being recorded.

[0006]

Means for Solving the Problems In order to solve this problem, a hologram manufacturing method according to the present invention, the hologram dry
Copy via the refractive index adjusting liquid layer on the surface of the plate on the photosensitive layer side
Lens or reflective master hologram
Prism is disposed on one surface via a refractive index adjustment liquid layer.
The copying lens or the reflection type master hologram.
Light reflecting film on the surface of the ram absorbs light on the side of the prism
Produces a hologram dry plate assembly with each film formed
Hologram manufacturing with hologram dry plate assembly process
A hologram dry plate assembling step.
Blocks laser light incident on one end of the program dry plate
Is formed by the entrance surface and the exit surface of the prism.
Corner of the hologram dry plate
At the protruding corner and the protruding corner
A light-shielding body is formed on the incident surface .

[0007]

[0008]

According to the present invention, at the time of the photographing step, the laser beam incident on one end face of the hologram dry plate is blocked by the light shield and does not pass through the photosensitive agent layer of the hologram dry plate. No noise image is recorded on the photosensitive layer by the laser beam .

Therefore, the present invention can prevent recording of a noise image on the photosensitive agent layer.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

(1) First Embodiment (FIGS. 1, 2, 3 and 4) The hologram manufacturing method according to this embodiment manufactures a hologram dry plate assembly 100 having a cross-sectional shape as shown in FIG. The main part is to perform the DC operation as shown in FIG.
It comprises a G film forming step, a drying step, a black painting step, an assembling step (hologram dry plate assembling step), a photographing step, a developing step, and an assembling step (hologram assembling step). Hereinafter, each of the above steps will be described.

DCG film forming step A DC having a thickness of about 20 μm is formed as a photosensitive agent layer 2 on a soda glass (refraction index: about 1.52) 1 of 100 × 50 × 1.5 mm.
A G (dichromated gelatin) film is formed.

Drying Step The soda glass 1 having the DCG film 2 formed thereon is dried at 20 ° C.
The hologram dry plate 3 is obtained by drying all day and night in an atmosphere of 50%.

Black coating step One end face 3a and the other end face 3b of the hologram dry plate 3
Are respectively coated with black to form light absorbing films (noise image recording preventive members) 4 and 5.

Hologram Dry Plate Assembling Step A light reflecting film 10 is formed on the convex surface 9a by aluminum evaporation, and a light absorbing film (noise image recording preventive body) 1 is formed on the end surface 9b.
The copy lens 9 formed with 1 is closely attached to the surface of the hologram dry plate 3 on the side of the photosensitive agent layer 2 via a refractive index adjusting liquid layer (silicon oil or xylene, etc.) 12, and the side surface 6a is painted black. The prism 6 on which the light absorbing film 7 is formed is disposed in close contact with the other surface side of the hologram dry plate 3 via the refractive index adjusting liquid layer 8 to obtain the hologram dry plate assembly 100 shown in FIG.

Here, the refractive index adjusting liquid layers 8 and 12 are provided to prevent reflection at the interface between the hologram dry plate 3 and the prism 6 and the interface between the hologram dry plate 3 and the copying lens 9 due to a difference in refractive index. ing.

Imaging Step As shown in FIG. 1, an argon laser beam (wavelength 488 n
m) is applied to the hologram dry plate assembly 100 at about 100 mJ, and interference fringes are recorded on the photosensitive agent layer 2. At the time of this photographing, the curvature of the copy lens 9 and the incident angle θ to the prism 6
Thereby determine the pitch of the interference fringes.

In this photographing process, the hologram dry plate 3
One argon laser light that is incident on the end face 3a (noise image generation laser beam) L ₁ does not reach the photosensitive agent layer 2 is absorbed by the light absorbing layer 4, therefore by the argon laser beam L ₁ of No noise image is recorded.

The argon laser light (noise image generating laser light) L ₂ passing through the inside of the prism 6 and entering the other end face 3 b of the hologram dry plate 3 is absorbed by the light absorbing film 5, so that the end face 3 b in reflected never to reach the photosensitive material layer 2, therefore the noise image by the argon laser beam L ₂ is not recorded.

Further, argon laser light (noise image generating laser light) L _{3 which} once passes through the photosensitive agent layer 2, is reflected by the light reflecting film 10, and enters the end face 9 b of the copying lens 9.
Is absorbed by the light absorbing film 11,
1 never again pass through the photosensitive agent layer 2 is reflected on, thus the noise image by the argon laser beam L ₃ is not recorded.

It should be noted that the light reflecting film 1 which once passes through the photosensitive agent layer 2
The argon laser light L ₄ reflected at 0 and passed through the photosensitive agent layer 2 again is reflected at the incident surface 6 b of the prism 6,
Although is incident on a, it is absorbed by the light absorption film 7, thus the argon laser beam L ₄ are made shall be recorded only normal image, the noise image is not recorded.

As described above, no noise image is recorded on the photosensitive agent layer 2.

Developing Step The hologram dry plate 3 on which the interference fringes are recorded is subjected to a general developing process to obtain a hologram 3 '.

Hologram Assembling Step From the hologram 3 ′, a hologram assembly 200 as shown in a sectional view in FIG. 3 and a plan view in FIG. 4 is obtained.

The hologram assembly 200 has a seal width of 5 m by removing the periphery of the photosensitive agent layer 2 of the hologram 3 '.
m of the hologram 3 'is obtained, and the first cover plate 14 having an antireflection film 13 formed on the surface thereof is sensitized with the photosensitive material of the hologram 3' through a sealant 15 having a refractive index of 1.55 made of an epoxy thermosetting resin. On the surface not on the layer 2 side, on the other hand, a second cover plate 17 having an anti-scattering film 16 formed on the surface is similarly disposed on the surface of the hologram 3 ′ on the photosensitive agent layer 2 side via a sealant 18. It becomes.
For details, refer to Japanese Patent Application No. 3-262008.

(2) Second Embodiment (FIG. 5) In the hologram manufacturing method according to the present embodiment, the sectional shape is shown in FIG.
The main part is to manufacture the hologram dry plate assembling body 100 as shown in FIG. 1, and the black coating step in the first embodiment is omitted, and in the hologram dry plate assembling step, the photosensitive agent layer of the hologram dry plate 3 is The point that the copy lens 9 is closely mounted on the surface on the second side and the prism 6 is closely mounted on the other surface is the same as in the first embodiment.
Further, both end surfaces 3a and 3b of the hologram dry plate 3 and an exposed portion 9c on the surface of the copying lens 9 on the refractive index adjusting liquid layer 12 side.
A light-shielding body 19 painted in advance in black or the like is provided in contact therewith. Others are the same as the first embodiment.

In the photographing process in this embodiment, the argon laser light L ₁ incident on one end face 3 a of the hologram dry plate 3 is absorbed by the light shield 19 and does not reach the photosensitive agent layer 2. In addition, the argon laser light L ₂ passing through the inside of the prism 6 and entering the other end face 3 b of the hologram dry plate 3 is absorbed by the light shield 19 and is reflected by the end face 3 b to reach the photosensitive agent layer 2. Further, the argon laser light L ₃ that once passes through the photosensitive agent layer 2, is reflected by the light reflecting film 10, and enters the surface exposed portion 9 c of the copying lens 9 is absorbed by the light shielding body 19. Therefore, the light is not reflected by the surface exposed portion 9c and passes through the photosensitive agent layer 2 again.

Therefore, no noise image is recorded on the photosensitive agent layer 2 according to this embodiment. The other reference numerals in FIG. 5 represent the same components as those represented by the same reference numerals in FIG.

(3) Third Embodiment (FIG. 6) In the hologram manufacturing method according to the present embodiment, the sectional shape is shown in FIG.
The main part is to manufacture the hologram dry plate assembling body 100 as shown in FIG. 1 in that the black coating on one end surface 3a of the hologram dry plate 3 is omitted in the black coating step in the first embodiment. First, it differs from the first embodiment. Also, in the hologram dry plate assembling step, the copy lens 9 is disposed on the surface of the hologram dry plate 3 on the side of the photosensitive agent layer 2 and the prism 6 is disposed on the other surface in the same manner as in the first embodiment. However, a corner formed by the entrance surface 6b and the exit surface 6c of the prism 6 protrudes from one end surface 3a of the hologram dry plate 3 to form a projecting corner 6d. A light shielding body 20 is formed. However, the light shield 20 may be omitted depending on the length of the protruding corner 6d. Others are the same as the first embodiment.

In the photographing process of the present embodiment, the argon laser beam L ₁ incident on one end face 3 a of the hologram dry plate 3 is absorbed by the light shield 20 and does not reach the photosensitive agent layer 2. Further, the argon laser light L ₂ passing through the inside of the prism 6 and entering the other end face 3 b of the hologram dry plate 3 is absorbed by the light absorbing film 5 and is reflected by the end face 3 b to the photosensitive agent layer 2. Argon laser light L ₃ , which once passes through the photosensitive agent layer 2, is reflected by the light reflecting film 10, and enters the end surface 9 b of the copying lens 9, is absorbed by the light absorbing film 11. Therefore, the light is not reflected by the end face 9 b and passes through the photosensitive agent layer 2 again.

Therefore, according to this embodiment, no noise image is recorded on the photosensitive agent layer 2. The other reference numerals in FIG. 5 represent the same components as those represented by the same reference numerals in FIG.

(4) Fourth Embodiment (FIG. 7) In the hologram manufacturing method according to the present embodiment, the sectional shape is shown in FIG.
The main part is to manufacture a hologram dry plate assembling body 100 as shown in FIG. 1. In the hologram dry plate assembling step, the reflection type master hologram 21 is provided on the other surface of the hologram dry plate 3 instead of the copying lens 9. Are arranged in close contact with each other, and the light reflection film 2 is formed on the surface of the reflection type master hologram 21.
2 is different from the first embodiment. Others are the same as the first embodiment.

Then, in the photographing step in this embodiment, the argon laser light L ₁ incident on one end face 3 a of the hologram dry plate 3 is absorbed by the light absorbing film 4 and reaches the photosensitive agent layer 2. In addition, the argon laser beam L ₂ passing through the inside of the prism 6 and entering the other end face 3 b of the hologram dry plate 3 is absorbed by the light absorbing film 5 and is reflected on the end face 3 b to be reflected by the photosensitive agent layer 2. Never reach.

Therefore, no noise image is recorded on the photosensitive agent layer 2 according to this embodiment. The other reference numerals in FIG. 5 represent the same components as those represented by the same reference numerals in FIG.

As another embodiment, there is an embodiment in which the above embodiments are arbitrarily combined. Similarly, the recording of a noise image on the photosensitive agent layer 2 can be prevented. The photosensitive agent layer 2 is not limited to a DCG film, but may be a photopolymer film or the like. In the present embodiment, the one-beam method has been described. However, even in the two-beam method, recording of a noise image can be prevented by the same concept.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hologram dry plate assembly manufactured by a hologram dry plate assembly process in a hologram manufacturing method according to a first embodiment.

FIG. 2 is a process diagram of the hologram manufacturing method.

FIG. 3 is a cross-sectional view of a hologram assembly manufactured by a hologram assembly process in the hologram manufacturing method.

FIG. 4 is a plan view of the hologram assembly.

FIG. 5 is a cross-sectional view of a hologram dry plate assembly manufactured by a hologram dry plate assembly process in the second embodiment.

FIG. 6 is a sectional view of a hologram dry plate assembly manufactured by a hologram dry plate assembly process in a third embodiment.

FIG. 7 is a cross-sectional view of a hologram dry plate assembly manufactured by a hologram dry plate assembly process in a fourth embodiment.

FIG. 8 is a cross-sectional view of a hologram dry plate assembly manufactured by a hologram dry plate assembly process in the hologram manufacturing method on which the present invention is based;

[Explanation of symbols]

Reference Signs List 2 photosensitive agent layer 3 hologram dry plate 3a one end face of hologram dry plate 3b other end face of hologram dry plate 4,5,11 light absorbing film (noise image recording prevention body) 6 prism 6a prism side face 6b prism incidence face 6c prism Outgoing surface 6d Protruding corner of prism 7 Light absorbing film 8, 12 Refractive index adjusting liquid layer (silicon oil, etc.) 9 Copying lens 9b End face of copying lens 9c Exposure of copying lens 10,22 Light reflecting film 19, 20 light shield 21 reflective master hologram 100 hologram dry plate L _1, L _2, L ₃ noise image generation laser beam

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yasuhiro Mizutani 1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References JP-A-3-273276 (JP, A) JP-A-2- 109085 (JP, A) JP-A-3-168681 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03H 1/00-1/30

Claims (1)

(57) [Claims] The surface of the hologram dry plate on the side of the photosensitive agent layer is bent.
A copy lens or reflective mass through the refractive index adjustment liquid layer
A hologram, and a refractive index adjustment liquid layer on the other surface.
A prism is disposed through the
Is a light reflection film on the surface of the reflection type master hologram,
Light absorbing film is formed on each side of the prism
Hologram dry plate assembly for manufacturing hologram dry plate assembly
A hologram manufacturing method comprising the steps of:
In order to block laser light incident on one end face,
At the corner formed by the entrance and exit surfaces of the prism
Projection that protrudes from one end face of the hologram dry plate
To the incident surface at the corner and the projecting corner
A hologram manufacturing method, comprising forming a light shielding body .