JP2000035746A - Hologram creating device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to create a holographic stereogram within a short time. SOLUTION: In this hologram creating device, a multiple view point planar image is displayed on a liquid crystal panel 14 according to each region in which an element hologram of a photosensitive material 17 is recorded, and an image having a transmission region according to the position of the region is displayed on a liquid crystal panel 16. One of laser beams emitted from a laser beam source 10 and branched into two by a half-mirror 13 is amplitude- modulated by the liquid crystal panel 14, and diffused by a diffuser 15, and made incident on the region of the photosensitive material 17 corresponding to the transmission region displayed on the liquid crystal panel 16 as an object beam. The other laser beam halved by the half-mirror 13 is made incident on the region of the photosensitive material 17 corresponding to the transmission region displayed on the liquid crystal panel 16 as a reference beam. The object beam and the reference beam made incident on the photosensitive material 17 are interfered with each other and an element hologram is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram forming apparatus and method for forming a hologram capable of reproducing a desired wavefront, and more particularly, to a one-dimensional or two-dimensional holographic stereogram comprising a large number of element holograms. The present invention relates to a hologram forming apparatus and a hologram forming method.

[0002]

2. Description of the Related Art A holographic stereogram captures a subject as an ordinary photograph from various directions, modulates the amplitude of a laser beam with the ordinary photograph, and uses the amplitude-modulated laser beam as object light for one hologram. The element hologram is recorded in a local area of the photosensitive material, and such an element hologram is recorded for each area. Such holographic stereograms are one-dimensional and two-dimensional.
There are dimensions.

FIGS. 11 and 12 are explanatory views of a conventional technique for creating a one-dimensional holographic stereogram. First, as shown in FIG. 11, a subject 101 is placed on a turntable 102, and the subject 101 is rotated while rotating the turntable 102 at a constant speed.
3 is taken. On the original film 104 loaded in the cinema camera 103, a large number of multi-view plane images of the subject 101 imaged from different directions at fixed angles are continuously recorded in each frame.

Next, as shown in FIG. 12, a laser beam L is projected onto each frame of the developed original image film 104, and the laser beam L recorded on each frame is amplitude-modulated by a subject image. The amplitude-modulated laser light is used as object light.
This object light is made incident on a mask 108 having a slit-shaped opening 108S through a projection lens 105, a field lens 106, and a cylindrical lens 107, and the object light is transmitted to the photosensitive material 109 via the mask 108 together with the reference light from the reference light source 110. The holograms are made incident and interfere with each other to record an element hologram. Then, the photosensitive material 109 is moved corresponding to each frame of the original film 104, and the photosensitive material 1 is moved.
Element holograms are sequentially recorded in mutually different areas on the image 09, and a one-dimensional holographic stereogram is created on the photosensitive material 109.

FIG. 13 is an explanatory diagram of a method of reproducing a one-dimensional holographic stereogram. As shown in this figure, the photosensitive material 109 on which a large number of element holograms have been recorded and developed is cylindrical, and illumination light is emitted from an illumination light source 111 above. When viewed from the side, the reproduced image 112 can be observed in the internal space of the cylindrical photosensitive material 109.

In the example of producing and reproducing the one-dimensional holographic stereogram shown in FIGS. 11 to 13, the photosensitive material 109 on which the hologram is recorded is made cylindrical to directly reproduce an image. In contrast, in some cases, a subject is fixed and a subject is continuously photographed by a movie camera that moves on a straight line, thereby creating a planar hologram. Also, instead of fixing the cylindrical lens and the mask and moving the photosensitive material to create an element hologram, fixing the photosensitive material, using a diffusion plate instead of the cylindrical lens, and moving the mask to create an element hologram. There are ways.

On the other hand, a conventional technique for creating a two-dimensional holographic stereogram is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-32147.
No. 1 and JP-A-3-249686. FIG. 14 and FIG.
FIG. 1 is an explanatory diagram of a technique for creating a two-dimensional holographic stereogram disclosed in Japanese Patent Application Laid-Open Publication No. H10-110,026. First, as shown in FIG. 14, the viewpoint of the camera 122 is shifted a, b,
c, d,..., z, and sequentially move the subject 1 at each viewpoint.
21 is shot. On the original film 123 loaded in the camera 122, a multi-view plane image of the subject 121 captured from different directions for each viewpoint is recorded in each frame. Considering the ease and smoothness of hologram stereoscopic viewing, the larger the number of viewpoints, the better, but usually the number of viewpoints is one.
00 to 1000.

Next, as shown in FIG. 15, the developed original film 123 is set in a film holder 124, and the laser light output from the laser light source 125 is transmitted through a half mirror 126 and a diffusion lens 127 to the original image. The laser light is projected onto each frame of the film 123, the amplitude of the laser light is modulated based on the subject image recorded in each frame, and the amplitude-modulated laser light is projected on a screen 128 to be used as object light. Also, the half mirror 126 and the mirror 129
The laser beam that has passed through the lenses 130 and 131 is used as reference light. The object light and the reference light projected on the screen 128 pass through the opening of the mask 132 to the photosensitive material 133.
And the two are made to interfere with each other to record an element hologram. Then, the opening of the mask 132 is moved to a position corresponding to the viewpoint at which the subject 121 is imaged in each frame, and element holograms are sequentially recorded in mutually different areas on the photosensitive material 133, and the two-dimensional holographic image is recorded on the photosensitive material 133. Create a stereogram.

FIG. 16 is a schematic diagram of Japanese Patent Application Laid-Open No. 3-249686.
FIG. 1 is an explanatory diagram of a technique for creating a two-dimensional holographic stereogram disclosed in Japanese Patent Application Laid-Open Publication No. H10-110,026. As shown in this figure,
The laser light output from the laser light source 141 is split into two by the half mirror 142, and one of the split laser light is made incident on the spatial light modulator 145 via the mirror 143 and the lens 144, and the amplitude is changed by the spatial light modulator 145. The modulated laser light is projected as object light on a photosensitive material 147 via a lens 146. Also, the half mirror 14
The other part of the laser light, which is divided into two by 2, is projected from behind onto the photosensitive material 147 via the mirror 148 as the reference light.
The element hologram is recorded by causing the object light and the reference light projected on the photosensitive material 147 to interfere with each other. Then, the image presented to the spatial light modulator 145 is changed, and the photosensitive material 147 is moved to sequentially record element holograms in mutually different areas on the photosensitive material 147.
A two-dimensional holographic stereogram is created on 47.

In this manner, 0.3 mm to 0.5 mm
Element holograms are recorded in an array on the photosensitive material 147 at intervals, and a Lippmann hologram is created. Further, at the time of reproduction, by irradiating illumination light from the same direction as the incident direction of the reference light, object reproduction light is generated from each element hologram on the photosensitive material 147, and a reproduction image is obtained.

[0011]

However, the above conventional example has the following problems. That is, when producing a large number of element holograms on a hologram photosensitive material, it is necessary to sequentially move a mask that defines a region where object light and reference light enter the photosensitive material relative to the photosensitive material. Therefore, with this mechanical movement,
Not only does the mask and the photosensitive material vibrate, but the vibration propagates throughout the device. With such vibrations, interference fringes during element hologram recording become unstable. Therefore, conventionally, in order to stabilize interference fringes, an element hologram is recorded after waiting for about 1 second to 2 seconds after mechanical movement of the mask or the photosensitive material, and after the vibration is sufficiently settled.

In addition, the number of element holograms to be recorded on a photosensitive material is large, which requires a great deal of time to create a one-dimensional or two-dimensional holographic stereogram on the photosensitive material. For example, the opening width of the mask is 0.5 mm, the photosensitive material is relatively small, 4 inches × 5 inches, and the time required for recording each element hologram is 2 seconds. At this time, in the case of a one-dimensional holographic stereogram, the number of element holograms to be recorded on the photosensitive material is 254, and the time required to create the holographic stereogram is about 8 minutes. In the case of a two-dimensional holographic stereogram, the number of element holograms to be recorded on the photosensitive material is about 51600, and the time required to create the holographic stereogram is about 28 hours. Furthermore, in the case of a full-color holographic stereogram, since it is necessary to record elementary holograms for each of the three primary colors,
It takes three times as long as the required time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a hologram creating apparatus and method capable of creating a holographic stereogram in a short time.

[0014]

A hologram forming apparatus according to the present invention records object holograms in each of a plurality of areas by causing object light and reference light to enter each of a plurality of areas on a photosensitive material so as to interfere with each other. A holographic creator for creating a holographic stereogram, comprising: a first liquid crystal panel arranged substantially in close contact with a photosensitive material surface and defining a region where object light and reference light are incident on the photosensitive material. Features.

According to this hologram forming apparatus, the area where the object light and the reference light are incident on the photosensitive material, ie, the area where the object light and the reference light are incident,
The area where each element hologram is recorded is defined by the first liquid crystal panel. Then, while the regions where the object light and the reference light enter the photosensitive material are sequentially moved by the first liquid crystal panel, element holograms are recorded in each region on the photosensitive material, and a holographic stereogram is created. When a Fresnel-type holographic stereogram in which the object light and the reference light enter the photosensitive material from the same side is formed, the first liquid crystal panel is used for both the object light and the reference light. One is provided. On the other hand, when creating a Lippmann-type holographic stereogram in which the object light and the reference light enter the photosensitive material from different sides, the first liquid crystal panel is provided for each of the object light and the reference light. Can be

Further, the hologram forming apparatus according to the present invention comprises: (1) a second liquid crystal panel for amplitude-modulating the input coherent light and outputting it as object light; and (2) an output from the second liquid crystal panel. A first diffusion plate that diffuses the object light that has been diffused and outputs the diffused object light toward the first liquid crystal panel. In this case, the input coherent light is amplitude-modulated by the second liquid crystal panel and output as object light, and the object light output from the second liquid crystal panel is diffused by the first diffusion plate, and the diffusion is performed. The object light is incident on a region of the photosensitive material defined by the first liquid crystal panel. Therefore, the object light is generated by the second liquid crystal panel, and the incident angle of the object light is set by the second liquid crystal panel and the first liquid crystal panel.

Further, the hologram forming apparatus according to the present invention is provided between the first diffusion plate and the first liquid crystal panel, and defines a passage area of the object light diffused by the first diffusion plate, The liquid crystal display further includes a third liquid crystal panel that outputs the passed object light toward the first liquid crystal panel. In this case, the object light diffused by the first diffusion plate passes through the passage area of the third liquid crystal panel, and then enters the area of the photosensitive material defined by the first liquid crystal panel. Therefore, the provision of the third liquid crystal panel improves the light shielding performance with respect to the object light, and separates the presentation image when a plurality of element holograms are simultaneously recorded on the photosensitive material.

Further, the hologram forming apparatus according to the present invention comprises: (1) a fourth liquid crystal panel which defines a passing area of the input coherent light and outputs the passed coherent light as reference light; And a second diffusion plate for diffusing the reference light output from the fourth liquid crystal panel and outputting the diffused reference light to the first liquid crystal panel. In this case, the input coherent light passes through a pass area defined by the fourth liquid crystal panel and is output as reference light, and the reference light output from the fourth liquid crystal panel is output by the second diffusion plate. The diffused reference light is incident on a region of the photosensitive material defined by the first liquid crystal panel. Therefore, the incident angle of the reference light is set by the fourth liquid crystal panel and the first liquid crystal panel.

Further, the hologram forming apparatus according to the present invention is provided between the second diffusion plate and the first liquid crystal panel, and defines a passage area of the reference light diffused by the second diffusion plate, A fifth liquid crystal panel for outputting the passed reference light toward the first liquid crystal panel is further provided. In this case, the reference light diffused by the second diffusion plate passes through the passage area of the fifth liquid crystal panel, and then enters the area of the photosensitive material defined by the first liquid crystal panel. Therefore, the provision of the fifth liquid crystal panel improves the light blocking performance for the reference light.

In the hologram forming method according to the present invention, object light and reference light are made incident on a plurality of areas on a photosensitive material to interfere with each other, and element holograms are recorded on each of the plurality of areas to form a holographic stereogram. A hologram forming method for forming a hologram, wherein a first liquid crystal panel is disposed substantially in close contact with a photosensitive material surface, and a region where object light and reference light enter the photosensitive material is defined by the first liquid crystal panel. And

According to this hologram forming method, the region where the object light and the reference light are incident on the photosensitive material, that is,
The area where each element hologram is recorded is defined by the first liquid crystal panel. Then, while the regions where the object light and the reference light enter the photosensitive material are sequentially moved by the first liquid crystal panel, element holograms are recorded in each region on the photosensitive material, and a holographic stereogram is created. When a Fresnel-type holographic stereogram in which the object light and the reference light enter the photosensitive material from the same side is formed, the first liquid crystal panel is used for both the object light and the reference light. One is provided. On the other hand, when creating a Lippmann-type holographic stereogram in which the object light and the reference light enter the photosensitive material from different sides, the first liquid crystal panel is provided for each of the object light and the reference light. Can be

Also, in the hologram forming method according to the present invention, the input coherent light is amplitude-modulated by the second liquid crystal panel and output as object light, and the object light output from the second liquid crystal panel is output from the first liquid crystal panel. And the diffused object light is made incident on the region of the photosensitive material defined by the first liquid crystal panel. In this case, the object light is generated by the second liquid crystal panel, and the incident angle of the object light is set by the second liquid crystal panel and the first liquid crystal panel.

Further, according to the hologram forming method of the present invention, the object light diffused by the first diffusion plate by the third liquid crystal panel provided between the first diffusion plate and the first liquid crystal panel. Is defined, and the passed object light is output toward the first liquid crystal panel.
In this case, the provision of the third liquid crystal panel improves the light shielding performance with respect to the object light, and separates the presentation image when a plurality of element holograms are simultaneously recorded on the photosensitive material.

Further, in the hologram forming method according to the present invention, the input coherent light passes through a pass area defined by the fourth liquid crystal panel and is output as reference light, and is output from the fourth liquid crystal panel. The reference light is diffused by a second diffusion plate, and the diffused reference light is incident on a region of the photosensitive material defined by the first liquid crystal panel. In this case, the incident angle of the reference light is set by the fourth liquid crystal panel and the first liquid crystal panel.

Further, in the hologram forming method according to the present invention, the reference light diffused by the second diffusion plate by the fifth liquid crystal panel provided between the second diffusion plate and the first liquid crystal panel. Is defined, and the transmitted reference light is output toward the first liquid crystal panel.
In this case, the provision of the fifth liquid crystal panel improves the light shielding performance for the reference light.

[0026]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

(First Embodiment) First, a first embodiment of a hologram forming apparatus and method according to the present invention will be described. This embodiment is suitable for creating a Fresnel type holographic stereogram. FIG.
FIG. 1 is a configuration diagram of a hologram creating device according to a first embodiment.

The laser light source 10 is a light source that emits laser light that is coherent light. The electromagnetic shutter 11 passes or blocks laser light emitted from the laser light source 10 under the control of the computer 19. The collimating lens system 12 receives the laser light that has passed through the electromagnetic shutter 11 and expands the light beam diameter to convert the light into parallel light. Half mirror 1
The reference numeral 3 divides the laser light collimated by the collimating lens system 12 into two.

The liquid crystal panel 14 has a large number of pixels arranged two-dimensionally, and can set the light transmittance for each pixel. For example, parallel Nicols polarized light is provided on both sides of a TN type liquid crystal panel. The board is stuck. A predetermined multi-view plane image is written on the liquid crystal panel 14 under the control of the computer 19. The liquid crystal panel 14 receives the laser light transmitted through the half mirror 13, applies spatial amplitude modulation to the input laser light according to the multi-view plane image, and outputs the resulting laser light.

The diffusing plate 15 receives the laser light output from the liquid crystal panel 14 after being amplitude-modulated, and diffuses the inputted laser light in one or two dimensions. The diffusion plate 15 may be disposed immediately after the liquid crystal panel 14 or substantially in close contact therewith. However, a lens is provided between the diffusion plate 15 and the liquid crystal panel 14 so that the diffusion plate 15 is disposed in an image forming relationship with the liquid crystal panel 14. Is also good. A field lens may be provided immediately before the diffuser 15 in order to separate the observation viewpoint from the holographic stereogram. The diffusion plate 15 diffuses the laser light to such an extent that the laser light output from any position can reach the entire photosensitive material 17.

The laser light output from the diffusion plate 15 becomes object light incident on the photosensitive material 17. On the other hand, the laser light reflected by the half mirror 13 is reflected by the mirror 18 and becomes reference light incident on the photosensitive material 17.

The liquid crystal panel 16 arranged almost in close contact with the photosensitive material 17 has a large number of pixels arranged two-dimensionally, and can set the light transmittance for each pixel.
For example, a TN type liquid crystal panel is formed by attaching parallel Nicol polarizing plates to both sides. LCD panel 16
Is, for example, 0.5 mm in width under the control of the computer 19.
An image having a degree of slit-like transmission area is written. The liquid crystal panel 16 receives the object light arriving from the diffusion plate 15 and the reference light arriving from the mirror 18, and transmits the object light and the reference light, respectively, through a slit-shaped transmission region and outputs them. The object light and the reference light transmitted through the transmission region of the liquid crystal panel 16 interfere with each other in a region on the photosensitive material 17 corresponding to the transmission region, and an element hologram is recorded in the region on the photosensitive material 17. That is, the liquid crystal panel 16 defines an area where the element hologram is recorded on the photosensitive material 17.

The computer 19 comprises liquid crystal panels 14 and 16
A predetermined image is presented for each, and the operation of the electromagnetic shutter 11 is controlled. That is, the computer 19 calculates the photosensitive material 17
The multi-view plane image corresponding to the area where the element hologram to be recorded is recorded is presented on the liquid crystal panel 14. The computer 19
Presents the liquid crystal panel 16 with an image having a transmission area corresponding to the area where the element hologram of the photosensitive material 17 is to be recorded. Then, the computer 19 controls the electromagnetic shutter 11 so that the laser light emitted from the laser light source 10 passes through the electromagnetic shutter 11 for a certain time. In this way, element holograms are created in each area of the photosensitive material 17. The holographic stereogram is created by repeating the above operation while sequentially moving the region of the photosensitive material 17 where the element hologram is to be created. Note that the liquid crystal panel 16 can be used instead of providing the electromagnetic shutter 11.

This hologram forming apparatus operates as follows. Under the control of the computer 19, for each region of the photosensitive material 17 where an element hologram is to be recorded, a multi-view plane image corresponding to the position of the region is presented on the liquid crystal panel 14, and the transmission according to the position of the region is performed. An image having an area is presented on the liquid crystal panel 16. During the period in which the electromagnetic shutter 11 is open, the laser beam emitted from the laser light source 10 is expanded by the collimating lens system 12 into parallel light, and is split into two by the half mirror 13.
One of the two laser beams branched by the half mirror 13 is amplitude-modulated by the liquid crystal panel 14 on which the multi-view plane image is presented, diffused by the diffusion plate 15, and exposed to light corresponding to the transmission area presented on the liquid crystal panel 16. The light enters the region of the material 17 as object light. 2 by half mirror 13
The other split laser beam passes through the mirror 18 and passes through the photosensitive material 1 corresponding to the transmission area presented on the liquid crystal panel 16.
7 is incident on the region 7 as reference light. And photosensitive material 1
The object light and the reference light incident on 7 interfere with each other, and an element hologram is recorded. The element hologram is recorded for each region of the photosensitive material 17 as described above, and a holographic stereogram is created on the photosensitive material 17.

As described above, according to the hologram forming apparatus and method according to the present embodiment, when the element hologram is recorded in each area on the photosensitive material 17,
Since the transmissive area presented on the liquid crystal panel 16 disposed immediately before is sequentially moved, the mechanical movement of the mask or the photosensitive material, which is conventionally required, is unnecessary. Therefore, the time required for this mechanical movement becomes unnecessary, and
There is no need to wait for the vibration generated by the mechanical movement to stop. Therefore, a holographic stereogram can be created in a shorter time than before.

(Second Embodiment) Next, a second embodiment of the hologram forming apparatus and method according to the present invention will be described. This embodiment is suitable for creating a Lippmann-type holographic stereogram. FIG.
FIG. 2 is a configuration diagram of a hologram creating device according to a second embodiment.

The laser light source 20 is a light source that emits laser light that is coherent light. The electromagnetic shutter 21 passes or blocks laser light emitted from the laser light source 20 based on control by the computer 40. The collimating lens system 22 receives the laser light that has passed through the electromagnetic shutter 21 and expands the light beam diameter to convert it into parallel light. Half mirror 2
The reference numeral 3 divides the laser light collimated by the collimating lens system 22 into two. The mirrors 24-26 guide one of the laser beams split into two by the half mirror 23 to the liquid crystal panel 31, and the mirrors 27 and 28 guide the other to the liquid crystal panel 32.

A predetermined pattern is presented to each of the liquid crystal panels 31 and 32 based on control by the computer 40.
The incident laser light is amplitude-modulated and output. Diffusing plate 3
The liquid crystal panels 31 and 32 are disposed in close contact with the output sides of the liquid crystal panels 31 and 32, respectively.
Spread to reach the whole. Liquid crystal panels 35, 36
Each of them is disposed in close contact with both surfaces of the photosensitive material 39 with the photosensitive material 39 interposed therebetween, and a predetermined pattern is presented based on control by the computer 40, and the diffusion plate 33,
The laser light diffused by 34 is amplitude-modulated and incident on the photosensitive material 39. That is, each of the liquid crystal panels 35 and 36 defines an area where an element hologram is recorded on the photosensitive material 39.

The liquid crystal panel 31 outputs the amplitude-modulated laser light as object light for recording an element hologram. The liquid crystal panel 35 functions as a mask having an opening corresponding to an opening when a normal stereogram is created, and makes the object light incident only on a region of the photosensitive material 39 where an element hologram is to be recorded. On the other hand, each of the liquid crystal panel 32 and the liquid crystal panel 36 acts as a mask having an opening, and in combination with the diffusion action of the diffusion plate 34, only the region of the photosensitive material 39 where the element hologram is to be recorded
The reference light is made incident at an incident angle connecting the two openings.

Each of the liquid crystal panels 31, 32, 35 and 36 is controlled by a computer 40. The openings formed in the liquid crystal panels 35 and 36 have the same position and shape as each other, and define the area of the photosensitive material 39 where the element hologram is to be recorded. The amplitude modulation in the liquid crystal panel 31 and the position of the opening formed in the liquid crystal panel 32 also correspond to the area of the photosensitive material 39 where the element hologram is to be recorded. Further, the electromagnetic shutter 21
Are also controlled by the computer 40, and the liquid crystal panels 31, 3
The laser light emitted from the laser light source 20 is allowed to pass for a certain period of time during a period in which a predetermined pattern is presented to each of the reference numerals 2, 35, and 36.

The computer 40 controls the liquid crystal panel 3 according to the position of the area where the element hologram of the photosensitive material 39 is to be recorded.
The patterns to be given to 1, 32, 35 and 36 are calculated. That is, the computer 40 sets the liquid crystal panel 3 according to the area where the element hologram of the photosensitive material 39 is to be recorded.
The positions of the openings 5 are calculated, and the incident angles of the object light and the reference light are calculated. In addition, the computer 40 detects the photosensitive material 3
The light intensity information to be placed on the emission angle of the object reproduction light is rearranged according to the area where the 9 element holograms are to be recorded, and the light intensity information is translated on the liquid crystal panel 31. Further, the computer 40 calculates the positions of the openings of the liquid crystal panels 32 and 36 based on the area of the photosensitive material 39 where the element hologram is to be recorded and the incident angle of the reference light.
Then, the computer 40 presents the pattern calculated above to each of the liquid crystal panels 31, 32, 35 and 36, controls the electromagnetic shutter 21, and controls the electromagnetic shutter 21 to emit the laser light emitted from the laser light source 20 for a predetermined time. 21. In this way, the element hologram is recorded in a predetermined area of the photosensitive material 39. The holographic stereogram is created by repeating the above operation while sequentially moving the region of the photosensitive material 39 where the element hologram is to be recorded.

This hologram forming apparatus operates as follows. Under the control of the computer 40, for each region where the element hologram of the photosensitive material 39 is to be recorded, a multi-viewpoint plane image corresponding to the position of the region and the incident angle of the object light is presented on the liquid crystal panel 31, and the region is displayed. Are displayed on the liquid crystal panels 35 and 36, respectively, and an image having a transmission region according to the incident angle of the reference light is displayed on the liquid crystal panel 32. The laser light emitted from the laser light source 20 is expanded into a parallel light by the collimating lens system 22 while the electromagnetic shutter 21 is open, and is split into two by the half mirror 23.

One of the two laser beams branched by the half mirror 23 enters the liquid crystal panel 31 via mirrors 24 to 26 in sequence, and is amplitude-modulated by the liquid crystal panel 31 on which the multi-view plane image is presented, and is diffused. The light is diffused by 33 and enters the region of the photosensitive material 39 corresponding to the transmission region presented on the liquid crystal panel 35 as object light. The other laser beam split into two by the half mirror 23 is
7 and 28 sequentially enter the liquid crystal panel 32, pass through the transmission region presented on the liquid crystal panel 32,
4 and is incident as a reference light on the area of the photosensitive material 39 corresponding to the transmission area presented on the liquid crystal panel 36. At this time, the incident angle of the object light is a direction connecting the multi-view plane image presented on the liquid crystal panel 31 and the transmission area presented on the liquid crystal panel 35 to each other. The incident angle of the reference light is a direction connecting the transmission areas presented on the liquid crystal panels 32 and 36 to each other.

Then, the object light and the reference light incident on the photosensitive material 39 interfere with each other, and an element hologram is recorded. The element hologram is recorded for each area of the photosensitive material 39 as described above, and a Lippmann-type holographic stereogram is created on the photosensitive material 39.

In the above description, the element holograms are recorded one by one on the photosensitive material 39. However, a plurality of element holograms can be simultaneously recorded on the photosensitive material 39. The latter case will be described with reference to FIG. FIG. 3 is a configuration diagram of a main part of the hologram creating device according to the second embodiment. This figure shows a liquid crystal panel 31, a diffusion plate 33, and a liquid crystal panel 35 that constitute an optical system that causes object light to enter the photosensitive material 39.

As each of the liquid crystal panels 31 and 35, for example, one having an XGA display capability capable of presenting an image of 1024 × 1024 pixels is used. The liquid crystal panel 31 is divided into 12 × 256 × 256.
Images a to l can be simultaneously presented to each of the pixel regions. The liquid crystal panel 35 is a liquid crystal panel 31
400 μm on each side corresponding to each of the divided areas
It is possible to present an image having twelve transparent areas am to lm of a square shape. The distance between the liquid crystal panel 31 and the liquid crystal panel 35 is, for example, about 1 cm.

The laser light incident on the liquid crystal panel 31 is amplitude-modulated by the images a to l presented on the liquid crystal panel 31 and diffused by the diffusion plate 33 before being incident on the liquid crystal panel 35. At this time, for example, a portion of the laser beam amplitude-modulated by the image f on the liquid crystal panel 31 is transmitted through the transmission region fm on the liquid crystal panel 35 and enters the photosensitive material 39 as object light, but is transmitted to another transmission region. am-em and gm
Lm is not transmitted. This is because, in general, a liquid crystal panel can transmit light having an incident angle smaller than a certain angle (for example, 45 °) but does not transmit light having an incident angle larger than a certain angle.

Similarly, the liquid crystal panel 32
And 36 respectively, by presenting an image having twelve transparent areas of a square with a side of about 400 μm,
Reference light is incident on the photosensitive material 39 at an incident angle connecting the corresponding transmission areas of the liquid crystal panels 32 and 36. Therefore, 12 element holograms can be simultaneously recorded on the photosensitive material 39.

As described above, according to the hologram forming apparatus and method according to the present embodiment, when the element hologram is recorded in each area on the photosensitive material 39, the photosensitive material 39 is recorded.
Since the transmissive areas presented on the liquid crystal panels 31 and 32 disposed between the masks are sequentially moved, there is no need for mechanical movement of a mask or a photosensitive material, which is conventionally required. Therefore, the time required for the mechanical movement becomes unnecessary, and the time for waiting until the vibration generated by the mechanical movement stops is also eliminated. Therefore,
A holographic stereogram can be created in a shorter time than before.

Further, by writing data corresponding to a plurality of element holograms to the liquid crystal panels 31, 32, 35 and 36, a plurality of element holograms can be simultaneously recorded on the photosensitive material 39. Therefore, also in this respect, it is possible to create a hologram in a shorter time than before.

Further, the liquid crystal panels 31, 32, and 35 are considered in consideration of the incident angle of the illumination light to be incident on each element hologram.
And 36 to calculate the data to be written. That is, when the incident angle of the illumination light is parallel illumination light that is constant over the entire surface of the hologram, when the illumination light is emitted from a point light source that is sufficiently far from the hologram, or when a point light source that is close to the hologram is used. A reproduced image without distortion can be obtained even in the case of illumination light emitted from. Also, not only when the hologram is flat, but also when the hologram is pasted on a curved surface,
A reproduced image without distortion can be obtained.

In the case where the illuminating light at the time of reproducing the created planar holographic stereogram is parallel light or is emitted from an illuminating light source located at a sufficiently distant position, the reference light at the time of creation is used. May be parallel light. Therefore, in this case, the liquid crystal panel 32 and the diffusion plate 34 are unnecessary. However, as will be described in the following embodiments, it is preferable to provide a liquid crystal panel 32 in order to improve the overall light shielding performance in a region of the photosensitive material where laser light should not be incident.

(Third Embodiment) Next, a third embodiment of the hologram forming apparatus and method according to the present invention will be described. This embodiment is also suitable for creating a Lippmann-type holographic stereogram. FIG.
FIG. 3 is a configuration diagram of a hologram creating device according to a third embodiment.

This embodiment is different from the second embodiment in that a liquid crystal panel 38 is newly added. The liquid crystal panel 38 is provided between the diffusion plate 34 and the liquid crystal panel 36, and presents a predetermined pattern under the control of the computer 40. The liquid crystal panel 38 is used for improving light shielding performance as described below.

The operation of the liquid crystal panel 38 when a plurality of element holograms are simultaneously recorded on the photosensitive material 39 will be described with reference to FIG. FIG. 5 is a configuration diagram of a main part of the hologram creating device according to the third embodiment. This figure shows a liquid crystal panel 32, a diffusion plate 34, a liquid crystal panel 38, and a liquid crystal panel 36 which constitute an optical system for making reference light incident on the photosensitive material 39.

The liquid crystal panel 36 which is disposed substantially in close contact with the photosensitive material 39 defines an area where an element hologram is recorded on the photosensitive material 39. On the other hand, the liquid crystal panel 32 which is disposed substantially in close contact with the diffusion plate 34 defines the incident angle of the reference light to the photosensitive material 39 together with the liquid crystal panel 36. That is, the reference light is applied to the liquid crystal panel 32
And 36 at an angle of incidence connecting the transmission regions presented to each other, to the region of the photosensitive material 39 corresponding to the transmission region presented to the liquid crystal panel 36.

The liquid crystal panel 38 located in the middle
Is controlled by the computer 40 so as to have the transmission area on a straight line connecting the transmission areas presented to the liquid crystal panels 32 and 36, respectively. Alternatively, when the liquid crystal panel 38 is disposed in close contact with the liquid crystal panel 36, the computer 40 controls the transmission area of the liquid crystal panel 38 to be substantially the same as the transmission area of the liquid crystal panel 36. Alternatively, when the liquid crystal panel 38 is disposed substantially in close contact with the diffusion plate 34, the computer 40 controls the transmission area of the liquid crystal panel 38 to be substantially the same as the transmission area of the liquid crystal panel 32. You.

That is, of the laser light incident on the liquid crystal panel 32, the laser light transmitted through each of the transmission regions ra to rl is diffused by the diffusion plate 34, transmitted through the corresponding transmission region of the liquid crystal panel 38, and further transmitted through the liquid crystal panel 38. The liquid crystal panel 3 is transmitted through the corresponding transmission areas am to lm of the panel 36.
6 photosensitive material 39 defined by transmission areas am to lm
Are incident on each of the regions as reference light. Therefore, the incident direction of the reference light is a straight line connecting the corresponding transmission areas of the liquid crystal panels 32, 38, and 36.

This embodiment has the following effects in addition to the effects of the second embodiment. That is, in the second embodiment, two liquid crystal panels 32 and 3
6, the reference light is incident on the photosensitive material 39,
In the present embodiment, three liquid crystal panels 32, 38 and 36 are used.
Then, the reference light is incident on the photosensitive material 39. Therefore,
When the contrast of the transmittance between the laser light transmitting area and the laser light shielding area in each liquid crystal panel is low,
In this embodiment, even when the light shielding performance of the laser light shielding area in each liquid crystal panel is low, the reference light is incident on the photosensitive material through the three liquid crystal panels in the present embodiment.
The overall light shielding performance is improved in the area of the photosensitive material 39 where laser light should not be incident. In addition, when the number of liquid crystal panels is larger, the light shielding performance is further improved.

(Fourth Embodiment) Next, a hologram forming apparatus and method according to a fourth embodiment of the present invention will be described. This embodiment is also suitable for creating a Lippmann-type holographic stereogram. FIG.
FIG. 9 is a configuration diagram of a hologram creating device according to a fourth embodiment.

This embodiment is different from the third embodiment in that a liquid crystal panel 37 is newly added. The liquid crystal panel 37 is provided between the diffusion plate 33 and the liquid crystal panel 35, and presents a predetermined pattern based on control by the computer 40. The liquid crystal panel 37 is used for improving light-shielding performance and / or separating displayed images as described below.

First, the case where the liquid crystal panel 37 is used for improving the light shielding performance will be described with reference to FIG. FIG.
FIG. 9 is a configuration diagram of a main part of a hologram creation device according to a fourth embodiment. In this figure, a liquid crystal panel 31 and a diffusion plate 3 constituting an optical system for making object light incident on the photosensitive material 39 are shown.
3, a liquid crystal panel 37 and a liquid crystal panel 35 are shown.

The liquid crystal panel 35 arranged in close contact with the photosensitive material 39 presents a transmission area 35 a defining an area for recording an element hologram on the photosensitive material 39. On the other hand, the liquid crystal panel 31, which is arranged in close contact with the diffusion plate 33, presents a multi-view plane image 31a, and amplitude-modulates the incident laser light with the multi-view plane image 31a to produce object light. This defines the incident angle of the object light to the photosensitive material 39 together with the liquid crystal panel 35. In addition,
The area other than the area of the multi-view plane image 31a of the liquid crystal panel 31 blocks the laser light. That is, the object light has an incident angle connecting the multi-view plane image 31a presented on the liquid crystal panel 31 and the transmissive area 35a presented on the liquid crystal panel 35, and corresponds to the transmissive area 35a presented on the liquid crystal panel 35. The light enters the area of the photosensitive material 39.

Then, assuming a truncated quadrangular pyramid having the upper surface and the lower surface respectively of the multi-view plane image 31a presented on the liquid crystal panel 31 and the transmissive area 35a presented on the liquid crystal panel 35, the liquid crystal panel located in the middle 37 is
The computer 40 controls the area that intersects this truncated pyramid to be the transmission area 37a. Alternatively, the liquid crystal panel 37
Is arranged in close contact with the liquid crystal panel 35, the computer 40 controls the transmission area 37a of the liquid crystal panel 37 to be substantially the same as the transmission area 35a of the liquid crystal panel 35. Alternatively, when the liquid crystal panel 37 is disposed in close contact with the diffusion plate 33,
Is controlled by the computer 40 so as to be substantially the same as the multi-view plane image 31a of the liquid crystal panel 31.

That is, the laser light incident on the liquid crystal panel 31 and amplitude-modulated by the multi-view plane image 31 a is diffused by the diffusion plate 33, transmitted through the corresponding transmission area 37 a of the liquid crystal panel 37, and further transmitted to the liquid crystal panel 35. Of the photosensitive material 39 defined by the transmission area 35a of the liquid crystal panel 35 as object light. Therefore, the incident direction of the object light is a direction connecting the multi-view plane image 31a presented on the liquid crystal panel 31, the corresponding transmission area 37a of the liquid crystal panel 37, and the corresponding transmission area 35a of the liquid crystal panel 35.

In this case, the following effects are obtained in addition to the effects of the second or third embodiment. That is, in the second and third embodiments, the object light is incident on the photosensitive material 39 via the two liquid crystal panels 31 and 35, whereas in the present embodiment, the three liquid crystal panels 31, 37 and 35 are used. Then, the object light is incident on the photosensitive material 39. Therefore, even when the contrast of the transmittance between the laser light transmitting area and the laser light shielding area in each liquid crystal panel is low, or when the light shielding performance of the laser light shielding area in each liquid crystal panel is low, the present embodiment can be used. In this case, the object light is incident on the photosensitive material through the three liquid crystal panels, so that the entire light-shielding performance is improved in the region of the photosensitive material 39 where laser light should not be incident. In addition, when the number of liquid crystal panels is larger, the light shielding performance is further improved.

The transmission area presented on each of the liquid crystal panels 35 and 37 is, in combination with the area of the multi-view plane image presented on the liquid crystal panel 31, an area on which the element hologram on the photosensitive material 39 is to be recorded. It is sufficient if the object light is not incident on the other area on the photosensitive material 39 while the object light is incident on the photosensitive material 39. For example, as shown in FIG. 8, the transmission regions 35b and 37b presented on the liquid crystal panels 35 and 37 have the same width as the width of the region on the photosensitive material 39 where the element hologram is to be recorded, and have a longitudinal direction. The slits may be orthogonal to each other. In this case, a region where the transmission regions 35b and 37b presented on the liquid crystal panels 35 and 37 overlap each other defines a region where an element hologram is recorded on the photosensitive material 39.
Also in this case, the light shielding performance is improved.

Next, a case where the liquid crystal panel 37 is used for separating the presentation image will be described with reference to FIG. FIG.
FIG. 9 is a configuration diagram of a main part of a hologram creation device according to a fourth embodiment. In this figure, a liquid crystal panel 31 and a diffusion plate 3 constituting an optical system for making object light incident on the photosensitive material 39 are shown.
3, a liquid crystal panel 37 and a liquid crystal panel 35 are shown. In the following description, two element holograms are recorded simultaneously.

The liquid crystal panel 35, which is disposed in close contact with the photosensitive material 39, has two transmission areas 3 that define areas for recording two element holograms on the photosensitive material 39.
5c and 35d are presented simultaneously. On the other hand, the liquid crystal panel 31 arranged substantially in close contact with the diffusion plate 33 simultaneously presents two multi-view plane images 31c and 31d, and modulates the incident laser light with the multi-view plane images 31c and 31d. And the incident angle of the object light to the photosensitive material 39 together with the liquid crystal panel 35 is defined. The multi-view plane images 31c and 3c of the liquid crystal panel 31
The region other than the region 1d blocks the laser light. That is, the first object light has an incident angle connecting the multi-view plane image 31c presented on the liquid crystal panel 31 and the transmissive area 35c presented on the liquid crystal panel 35, and has a transmission area 35c presented on the liquid crystal panel 35. Is incident on the region of the photosensitive material 39 corresponding to. The second object light has an incident angle connecting the multi-view plane image 31d presented on the liquid crystal panel 31 and the transmissive area 35d presented on the liquid crystal panel 35, and has a transmission area 35d presented on the liquid crystal panel 35. Is incident on the region of the photosensitive material 39 corresponding to.

The liquid crystal panel 37 is the liquid crystal panel 3
3 and the liquid crystal panel 35, and presents two transmission areas 37c and 37d simultaneously. Multi-view plane image 31c and liquid crystal panel 35 presented on liquid crystal panel 31
Assuming a truncated quadrangular pyramid with the upper and lower surfaces of each of the transmission regions 35c presented in FIG.
A region including a region intersecting with the truncated pyramid is a transmission region 37c.
Is controlled by the computer 40 so that Further, assuming a truncated pyramid having a multi-view plane image 31d presented on the liquid crystal panel 31 and a transmissive area 35d presented on the liquid crystal panel 35 as upper and lower surfaces, respectively, the liquid crystal panel 37 has Is controlled by the computer 40 so that the area including the area that intersects the transmission area 37d.

That is, the laser light incident on the liquid crystal panel 31 and amplitude-modulated by the multi-view plane image 31 c is diffused by the diffusion plate 33, transmitted through the corresponding transmission area 37 c of the liquid crystal panel 37, and further transmitted to the liquid crystal panel 35. Of the photosensitive material 39 defined by the transmissive region 35c of the liquid crystal panel 35 as first object light. Therefore, the incident direction of the first object light is a direction connecting the multi-view plane image 31c presented on the liquid crystal panel 31, the corresponding transmission area 37c of the liquid crystal panel 37, and the corresponding transmission area 35c of the liquid crystal panel 35.

Similarly, the laser light incident on the liquid crystal panel 31 and amplitude-modulated by the multi-view plane image 31d is diffused by the diffusion plate 33, transmitted through the corresponding transmission area 37d of the liquid crystal panel 37, and further transmitted to the liquid crystal panel 37. The light passes through the corresponding transmission area 35d of the liquid crystal panel 35 and enters the area of the photosensitive material 39 defined by the transmission area 35d of the liquid crystal panel 35 as the second object light. Therefore, the incident direction of the second object light is the multi-view plane image 3 presented on the liquid crystal panel 31.
1d, a direction connecting the corresponding transmission area 37d of the liquid crystal panel 37 and the corresponding transmission area 35d of the liquid crystal panel 35.

In this case, the following effects are obtained in addition to the effects of the second or third embodiment. That is, by newly providing the liquid crystal panel 37, the laser light incident on the liquid crystal panel 31 and amplitude-modulated by the multi-view plane image 31c is transmitted through the corresponding transmission area 35c of the liquid crystal panel 35. Transmission area 35 of
It does not transmit d. The laser light incident on the liquid crystal panel 31 and amplitude-modulated by the multi-view plane image 31d transmits through the corresponding transmission area 35d of the liquid crystal panel 35, but does not transmit through the transmission area 35c of the liquid crystal panel 35. Therefore, image separation is performed.
Further, as described above, the light shielding performance is also improved.

The distance between the liquid crystal panel 31 for presenting the multi-view plane image and the liquid crystal panel 35 for defining the area where the element hologram is to be recorded is small, and the two multi-view plane images presented on the liquid crystal panel 31 are small. When the distance between 31c and 31d is large and the transmission viewing angle of the liquid crystal panel 35 is small (for example, 30 ° or less up and down, 45 ° or less left and right), the first and second object lights are mixed with each other. Since there is little concern, there is no need to provide the liquid crystal panel 37.

(Fifth Embodiment) Next, a fifth embodiment will be described. This embodiment reproduces a color reproduction image composed of object reproduction light of each of a plurality of reproduction wavelengths by irradiating white illuminating light by using the hologram forming apparatus and method according to the second to fourth embodiments. The present invention relates to a method for producing a Lippmann-type holographic stereogram by making object light and reference light of a single recording wavelength interfere with each other on a photosensitive material. In this method, the incident angle θo of the object light in the photosensitive material, the incident angle θr of the reference light, the incident angle θc of the illumination light, and the emission angle θi of the object reproduction light are determined by a conditional expression of the three-dimensional hologram.
Color shift and distortion of the reproduced image can be suppressed.

In this method, the recording wavelength λo, the reproduction wavelength λ
j, the incident angle θc of the illumination light and the emission angle θi of the object reproduction light
Are determined, and the incident angle θo of the object light, the incident angle θr of the reference light, and the ratio Mj of the thickness of the photosensitive material at the time of recording and at the time of reproduction are determined based on these. Since there are three parameters to be determined, they cannot be determined simultaneously. Therefore, the incident angle θr of the reference light and the ratio Mj of the thickness of the photosensitive material at the time of recording and at the time of reproduction are first determined, and thereafter, the incident angle θo of the object light is determined.

FIG. 10 is a flowchart illustrating a hologram forming method according to this method. Step S11
Then, in the first direction (y-axis direction) on the photosensitive material surface, the recording wavelength λo, the reproduction wavelength λj, and the incident angle θo of the object light
, The central angle of the emission angle θi of the object reproduction light, and the incident angle θc of the illumination light, and the incident angle θr of the reference light is calculated from the conditional expression of the two-dimensional hologram.

In the following step S12, in the first direction, the ratio Mj of the thickness of the photosensitive material at the time of recording and at the time of reproduction is determined from the conditional expression of the three-dimensional hologram based on the parameters set or calculated at step S11. Is calculated.

In the following step S13, the recording wavelength λo, the reproduction wavelength λj, and the incident angle θ of the reference light in the second direction (x-axis direction) on the boundary surface orthogonal to the first direction.
r, the incident angle θc of the illumination light, the emission angle θi of the object reproduction light, and the ratio Mj.
The incident angle θo of the object light is calculated.

In step S14, the first direction and the second direction
For each of the directions, the incident angle θo of the object light is controlled so as to correspond to the emission angle θi of the object reproduction light, or the reproduction object information corresponding to the emission angle θi of the object reproduction light is converted to the incident angle θo of the object light. Is converted into incident object information corresponding to. The calculations in steps S11 to S14 are performed by the computer 40.

Then, in Step S15, Step S
The hologram is recorded on the photosensitive material by causing the object light and the reference light calculated in 14 to interfere on the photosensitive material at the incident angles calculated in steps S11 to S13. At this time, under the control of the computer 40, the multi-view plane image calculated in step S14 is presented on the liquid crystal panel 31, and the liquid crystal panels 35 and 36 respectively
A transmission area corresponding to the area on the photosensitive material where the element hologram is to be recorded is presented, and a transmission area corresponding to the incident angle of the reference light is presented on the liquid crystal panel 32.

The ratio Mj calculated in step S12
Does not depend on the direction on the photosensitive material. Therefore, the incident angle θr of the reference light calculated in step S11 is equal to each other in the x-axis direction and the y-axis direction.

Here, in the case of conjugate image reproduction, the conditional expression of the two-dimensional hologram is

(Equation 1) And the conditional expression of the three-dimensional hologram is

(Equation 2) It is. In the case of direct image reconstruction, the conditional expression of the two-dimensional hologram is

(Equation 3) And the conditional expression of the three-dimensional hologram is

(Equation 4) It is. The subscript x indicates an angle formed by a straight line obtained by projecting the input / output direction of each light ray on the xz plane with the z axis. The suffix y indicates an angle formed by a straight line obtained by projecting the input / output direction of each ray on the yz plane with the z-axis. The subscript j is for identifying each of the plurality of reproduction wavelengths. no is the average refractive index of the photosensitive material during recording, and nc is the average refractive index of the photosensitive material during reproduction.

The relationship between the thickness of the photosensitive material at the time of recording and at the time of reproduction and the reproduction wavelength is as follows. In addition,
The incident angle of the illumination light in the air is 45 ° with respect to the y-axis direction.
And 0 ° with respect to the x-axis direction. First, the swelling process is not performed on the photosensitive material, the incident angle of the reference light is set to 45 °, which is the same as the incident angle of the illumination light, and object light is generated by an object image for red (wavelength 632.8 nm). Create an element hologram to obtain a reconstructed image.

Subsequently, the light-sensitive material was replaced with D-sorbitol 2
After soaking in a 0% solution at room temperature for 2 minutes, the surface of the photosensitive material is carefully wiped dry with a squeezer, and the back surface of the photosensitive material is thoroughly polished with water-moistened paper, and the photosensitive material is dried in a dark box. . Then, the dried photosensitive material is arranged at the same position as in the case of red, the incident angle of the reference light is set to 58 °, and object light is generated by an object image for green (wavelength: 514.5 nm). Create an element hologram that obtains

Subsequently, the photosensitive material was immersed in a 40% solution of D-sorbitol for 2 minutes at room temperature, the surface of the photosensitive material was carefully wiped dry with a squeezer, and the back surface of the photosensitive material was moistened with water. Polish well with paper and dry the photosensitive material in a dark box. Then, the dried photosensitive material is arranged at the same position as in the case of red, the incident angle of the reference light is set to 66.48 °, and object light is generated by an object image for blue (488.0 nm) to reproduce blue. Create an element hologram to obtain an image.

In this way, each of the three color components of red, green and blue is recorded on one photosensitive material. The photosensitive material is developed and bleached to return the swollen photosensitive material to its original thickness, and a full-color Lippmann-type holographic stereogram is created.

In the above description, the incident angle of the reference light is set to 45 ° with respect to the y-axis direction and set to 0 ° with respect to the x-axis direction.
Although the angle correction is performed only in the axial direction, a color shift occurs in the x-axis direction. The concentration of D-sorbitol (the ratio of swelling of the photosensitive material) was the same as above, the incident angle of the illumination light was 54.73 °, and the incident angle of the reference light for red was 5 °.
4.73 °, and the incident angle of the green reference light is 66.16.
By setting the incident angle of the reference light for blue to 72.89 °, the angle can be corrected in both the x-axis direction and the y-axis direction, and a full-color Lippmann hologram with even smaller color shift is created. can do.

In the above-described technique of full-color reproduction by changing the thickness of the photosensitive material, not only the silver halide photographic material but also a polymer material such as a photopolymer is suitably used as the photosensitive material. When a reproduced image is obtained using monochromatic light, the calculation may be performed with Mj = 1.

[0090]

As described above in detail, according to the present invention, the area where the object light and the reference light are incident on the photosensitive material, that is, the area where each element hologram is recorded,
It is defined by the first liquid crystal panel. Then, while the regions where the object light and the reference light enter the photosensitive material are sequentially moved by the first liquid crystal panel, element holograms are recorded in each region on the photosensitive material, and a holographic stereogram is created. By doing so, the mechanical movement of the mask or the photosensitive material, which was conventionally required, becomes unnecessary, so that the time required for the mechanical movement becomes unnecessary, and the mechanical movement is caused by this mechanical movement. There is no need to wait for the vibration to subside. Therefore, a holographic stereogram can be created in a shorter time than before.

Also, (1) a second liquid crystal panel which amplitude-modulates the input coherent light and outputs it as object light;
A first liquid crystal panel that diffuses the object light output from the liquid crystal panel and outputs the diffused object light to the first liquid crystal panel.
And a diffuser plate, the input coherent light is amplitude-modulated by the second liquid crystal panel and output as object light, and the object light output from the second liquid crystal panel is output by the first diffuser. The object light is diffused by the plate, and the diffused object light enters a region of the photosensitive material defined by the first liquid crystal panel. Therefore, the object light is generated by the second liquid crystal panel, and the incident angle of the object light is easily set by the second liquid crystal panel and the first liquid crystal panel.

[0092] Further, provided between the first diffusing plate and the first liquid crystal panel, a passing area of the object light diffused by the first diffusing plate is defined, and the passing object light is transmitted to the first liquid crystal panel. In the case where the liquid crystal panel further includes a third liquid crystal panel that outputs light toward the liquid crystal panel, the object light diffused by the first diffusion plate passes through a passage area of the third liquid crystal panel, and then passes through the first liquid crystal panel. To the area of the photosensitive material defined by Therefore, the provision of the third liquid crystal panel improves the light shielding performance with respect to the object light, and separates the presentation image when a plurality of element holograms are simultaneously recorded on the photosensitive material.

Also, (1) a fourth liquid crystal panel that defines a passing area of the input coherent light and outputs the passed coherent light as reference light, and (2) an output from the fourth liquid crystal panel. And a second diffusing plate for diffusing the reference light, and outputting the diffused reference light toward the first liquid crystal panel. The reference light output from the fourth liquid crystal panel is output as reference light after passing through the defined passage area, and the reference light output from the fourth liquid crystal panel is diffused by the second diffusion plate. The diffused reference light is specified by the first liquid crystal panel. Incident on the region of the photosensitive material.
Therefore, the incident angle of the reference light is easily set by the fourth liquid crystal panel and the first liquid crystal panel.

Further, provided between the second diffusion plate and the first liquid crystal panel, a pass area of the reference light diffused by the second diffusion plate is defined, and the passed reference light is transmitted to the first liquid crystal panel. In the case where the liquid crystal panel further includes a fifth liquid crystal panel that outputs light toward the liquid crystal panel, the reference light diffused by the second diffusion plate passes through a passage area of the fifth liquid crystal panel, and then passes through the first liquid crystal panel. To the area of the photosensitive material defined by Therefore, the provision of the fifth liquid crystal panel improves the light blocking performance for the reference light.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hologram creating device according to a first embodiment.

FIG. 2 is a configuration diagram of a hologram creating device according to a second embodiment.

FIG. 3 is a configuration diagram of a main part of a hologram creating device according to a second embodiment.

FIG. 4 is a configuration diagram of a hologram creating device according to a third embodiment.

FIG. 5 is a configuration diagram of a main part of a hologram creating device according to a third embodiment.

FIG. 6 is a configuration diagram of a hologram creating device according to a fourth embodiment.

FIG. 7 is a configuration diagram of a main part of a hologram creating apparatus according to a fourth embodiment.

FIG. 8 is a configuration diagram of a main part of a hologram creating apparatus according to a fourth embodiment.

FIG. 9 is a configuration diagram of a main part of a hologram creating device according to a fourth embodiment.

FIG. 10 is a flowchart illustrating a hologram creation method according to a fifth embodiment.

FIG. 11 is an explanatory diagram of a conventional technique for creating a one-dimensional holographic stereogram.

FIG. 12 is an explanatory diagram of a conventional technique for creating a one-dimensional holographic stereogram.

FIG. 13 is an explanatory diagram of a method for reproducing a one-dimensional holographic stereogram.

FIG. 14 is an explanatory diagram of a conventional technique for creating a two-dimensional holographic stereogram.

FIG. 15 is an explanatory diagram of a conventional technique for creating a two-dimensional holographic stereogram.

FIG. 16 is an explanatory diagram of a conventional technique for creating a two-dimensional holographic stereogram.

[Explanation of symbols]

Reference Signs List 10 laser light source 11 electromagnetic shutter 12 collimating lens system 13 half mirror 14 liquid crystal panel 15 diffusion plate 16 liquid crystal panel 17 photosensitive material 18 mirror 19 computer 20 … Laser light source,
21: electromagnetic shutter, 22: collimating lens system, 23
.., Half mirror, 24-28 mirror, 31, 32 liquid crystal panel, 33, 34 diffusion plate, 35-38 liquid crystal panel, 39 photosensitive material, 40 computer.

Continued on the front page (72) Inventor Kenji Ima 2-2-4-2 Chuo, Mutsu City, Aomori Prefecture Art Term Now F-term (Reference) 2K008 AA00 BB00 FF03 HH01 HH06 HH18 HH23 HH25 HH26

Claims (10)

[Claims] 1. A hologram forming apparatus for irradiating an object beam and a reference beam on each of a plurality of regions on a photosensitive material and causing them to interfere with each other, and recording an element hologram on each of the plurality of regions to form a holographic stereogram. And a first liquid crystal panel arranged substantially in close contact with the photosensitive material surface and defining a region where the object light and the reference light are incident on the photosensitive material. 2. A second liquid crystal panel that amplitude-modulates the input coherent light and outputs the object light as the object light, and diffuses the object light output from the second liquid crystal panel, and diffuses the object. The hologram creation device according to claim 1, further comprising: a first diffusion plate that outputs light toward the first liquid crystal panel. 3. A region provided between the first diffusion plate and the first liquid crystal panel, defining a passage area of the object light diffused by the first diffusion plate, and passing the object light. 3. The hologram forming apparatus according to claim 2, further comprising a third liquid crystal panel that outputs the third liquid crystal toward the first liquid crystal panel. 4. A transmission area of the input coherent light is defined,
A fourth output that outputs the passed coherent light as the reference light.
And a second diffusion plate that diffuses the reference light output from the fourth liquid crystal panel and outputs the diffused reference light toward the first liquid crystal panel. The hologram creating apparatus according to claim 1, wherein: 5. A reference region provided between the second diffusion plate and the first liquid crystal panel, defining a passage area of the reference light diffused by the second diffusion plate, and passing the reference light. 5. The hologram forming apparatus according to claim 4, further comprising a fifth liquid crystal panel that outputs a signal to the first liquid crystal panel. 6. A hologram forming method for making object light and reference light incident on each of a plurality of regions on a photosensitive material and causing them to interfere with each other, and recording an element hologram on each of the plurality of regions to form a holographic stereogram. A first liquid crystal panel is disposed substantially in close contact with the photosensitive material surface, and a region where the object light and the reference light are incident on the photosensitive material is defined by the first liquid crystal panel. Hologram creation method. 7. The input coherent light is amplitude-modulated by a second liquid crystal panel and output as the object light, and the object light output from the second liquid crystal panel is diffused by a first diffusion plate. 7. The hologram forming method according to claim 6, wherein the diffused object light is incident on a region of the photosensitive material defined by the first liquid crystal panel. 8. A third liquid crystal panel provided between the first diffusion plate and the first liquid crystal panel defines a passage area of the object light diffused by the first diffusion plate. 8. The hologram forming method according to claim 7, wherein the transmitted object light is output toward the first liquid crystal panel. 9. The input coherent light passes through a pass area defined by a fourth liquid crystal panel and is output as the reference light, and the reference light output from the fourth liquid crystal panel is a second reference light. 7. The hologram forming method according to claim 6, wherein the hologram is diffused by a diffusion plate, and the diffused reference light is incident on a region of the photosensitive material defined by the first liquid crystal panel. 10. A fifth liquid crystal panel provided between the second diffusion plate and the first liquid crystal panel defines a passage area of the reference light diffused by the second diffusion plate. 10. The hologram forming method according to claim 9, wherein the transmitted reference light is output toward the first liquid crystal panel.