JP3016282B2 - How to make a Lippmann holographic stereogram - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a Lippmann holographic stereogram, and more particularly to a method for easily producing a Lippmann holographic stereogram having extremely high image quality without trouble. The present invention relates to a method for producing a Lippmann holographic stereogram.

[0002]

2. Description of the Related Art In recent years, holograms are widely used in the publishing or printing industries as a means for preventing the cover of books and magazines, illustrations, gifts, novelties, or forgery of securities, credit cards, and IC cards. Have been. There are various types of holograms of this type, one of which is the Lippman holographic stereogram. That is, hologram recording is performed by causing light called object light and light called reference light to interfere with each other. These two lights are recorded by being incident from different surfaces such as the front and back of the photosensitive material. Holograms are called Lippman holographic stereograms.

The Lippmann holographic stereogram is a reflection type hologram that allows an image to be observed from the same side as the direction in which the reproduction light is incident. Unlike other holograms, the hologram itself has wavelength selectivity. For this reason, even when reproduction is performed by using white light without using laser light, a good reproduced image is obtained. For this reason, it is widely used as a white light reproducing type display hologram.

By the way, as a conventional method for producing this kind of Lippmann holographic stereogram,
There are a one-step method and a two-step method.

First, the one-step method is a method for producing a Lippmann holographic stereogram by the following procedure.

(1) Creation of Original Image As shown in FIG. 4, a subject is photographed while moving the camera in the horizontal direction at a constant pitch, and when the subject is viewed from various angles. Obtain a picture of a planar image. From these photographs, images corresponding to the same part are taken out and arranged in a horizontal line to create a new image. This image is used as the original of the Lippmann holographic stereogram.

(2) Production of Lippmann holographic stereogram A Lippmann holographic stereogram is synthesized from the original picture created above by an optical system as shown in FIG. That is, the original image is projected by the projection lens,
Light is collected at the position of the slit with two cylindrical lenses. This light becomes light that is diffused in the vertical direction by the wrench killer. Then, using this light as object light, a Lippmann hologram is recorded on the dry plate. The dry plate is moved to the side of the slit width, and the next original image is changed to record the Lippmann hologram.
By repeating the above operation, a Lippmann holographic stereogram in which vertically long Lippmann holograms are arranged in a row on a dry plate is produced.

On the other hand, the two-step method is a method for producing a Lippmann holographic stereogram by the following procedure.

(1) Creation of Original Image As in the case of the one-step method, the subject is photographed while moving the camera in the horizontal direction at a constant pitch, and the subject is viewed from various angles. Obtain a planar image of the time. These planar images are the originals of the Lippmann holographic stereogram.

(2) Creation of Master Hologram A Lippmann holographic stereogram is synthesized from the original image created above by an optical system as shown in FIG. That is, one image in the original image is projected on a screen with a laser beam, and the projected image is recorded as a hologram on a dry plate through a slit. The next image is similarly recorded as a hologram by moving the dry plate by the slit width. By repeating the above operation, a holographic stereogram in which vertically long holograms each recording an image when the subject is viewed from a different angle are arranged in a horizontal line is created.

(3) Production of Lippmann hologram Using the holographic stereogram produced above as a master hologram, an image type Lippmann hologram is produced by an optical system as shown in FIG. The Lippman hologram obtained in this way is a Lippman holographic stereogram that, when reproduced with white light, allows a stereoscopic image of the subject to be observed from a position corresponding to the master hologram.

However, the above-described one-step method and two-step method have the following problems.

First, the hologram produced by the one-step method has a trace of a slit on the final hologram.
Many vertical lines remain in the image. In addition, since the original image is created by manipulating the image from the photograph of the subject, it takes considerable time to create the original image. On the other hand, in the production method by the two-step method, a laser reproduction type holographic stereogram (master hologram) is once created from the original image of the holographic stereogram, and the Lipman holographic stereogram is formed from the reproduced image. Will be created. For this reason, the hologram photographing process is performed twice, and the image quality is degraded each time, and there is a problem that the image quality is poor. In addition, since hologram imaging is a very troublesome process, there is a problem in that imaging needs to be performed only once.

[0014]

As described above, the Lippman holographic stereogram produced by the conventional method has a problem that not only the image quality is poor, but also it takes much time and effort to produce it. .

The present invention has been made in order to solve the above-mentioned problems, and can easily produce an extremely high-quality Lippman holographic stereogram without trouble. Another object of the present invention is to provide a method for producing a Lippmann holographic stereogram with good image quality.

[0016]

In order to achieve the above object, first, a manufacturing method according to the first aspect of the present invention is directed to a planar image obtained by photographing a subject and viewing the subject from various angles. To obtain a stereogram original image, a copy master / hologram creation step of obtaining a shining Lippman hologram that forms a long and narrow slit image, and creating a copy master hologram, and a copy master・ On the copy master hologram created in the hologram creation process, a dry plate coated with a photosensitive material is placed on the surface, and the pattern of the stereogram original image created in the original image creation process is drawn on the dry plate. Place the mask on the plate, and move the plate in the specific direction by the width of the slit, and use the contact copy method to print different original patterns on the plate. By multiple exposure successively consists of a Lippmann stereogram generation step of generating a Lippmann stereogram.

Further, according to the manufacturing method of the present invention, there is provided an original image forming step of obtaining an image of a subject and obtaining a planar image when the subject is viewed from various angles to create a stereogram original image; Obtain a shining Lippman hologram that forms an elongated slit image, and create a copy master hologram creating step to create a copy master hologram, and place it on the copy master hologram created in the copy master hologram creating step. While placing a dry plate coated with photosensitive material on the surface, projecting the stereogram original image created in the original image creation process onto the dry plate with a projection lens, moving the dry plate in a specific direction by the width of the slit, different A Lippman stereogram is created by successively multiple exposure of the original pattern on a dry plate by the contact copy method. It is made up of a Lippmann stereogram creation process.

[0018]

Therefore, in the method for producing a Lippmann holographic stereogram according to the present invention, the holographic stereogram is produced by the contact copy method, so that it is hardly affected by vibration at the time of photographing and has low sensitivity. Stable shooting is possible even with photosensitive materials.

This makes it possible to obtain an extremely high-quality Lippman
A holographic stereogram can be easily produced without any trouble, and a display having good image quality can be obtained as a display.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

A specific method of producing the Lippmann holographic stereogram of this embodiment will be described with reference to FIGS.

(1) Original Image Creation Step As shown in FIG. 1, similar to the above-described conventional method of creating an original image of a Lippmann holographic stereogram, the camera 2 is moved at a constant pitch with respect to the subject 1 in the horizontal direction. The subject 1 is photographed while being moved step by step, and planar images are obtained when the subject 1 is viewed from various angles. These planar images are used as original images of the Lippmann holographic stereogram.

(2) Copy master hologram preparation step As shown in FIG. 2, an image-type Lippman hologram is prepared by a method of forming an image-type Lippman hologram. That is, the laser beam is split into two beams,
The master hologram 4 is illuminated by one of the laser beams 3 and a reproduced image from the master hologram 4 is reproduced at a position of a dry plate 6 coated with a photosensitive material on the surface through a slit 5 having a vertically elongated hole. In addition, the other laser beam 7 converts the dry plate 6 into parallel light from obliquely below.
To illuminate. Then, the Lippman hologram is photographed on the dry plate 6 by the interference of the two lights. In this case, an image of the diffusion plate is recorded on the master hologram 4 so as to uniformly illuminate the entire surface of the dry plate 6. Also,
The drying plate 6 is long in the horizontal direction, and the length in the horizontal direction is set to be larger than the length obtained by adding the length of the hologram in the horizontal direction to the horizontal length of the actual image. The hologram thus obtained is used as a copy master hologram.

(3) Lippman Stereogram Creation Step A Lippmann stereogram is created by an optical system as shown in FIG. That is, first, a dry plate 9 coated with a photosensitive material on the surface for recording a hologram is placed on the copy master hologram 8 created above, and the dry plate 9 created above is placed on the dry plate 9. The mask 10 on which the pattern of the original stereogram is recorded is arranged. In this case, first, the dry plate 9 is arranged on the left end of the copy master hologram 8 in the figure, and further thereon, a mask pattern 10 on which an image of the subject 1 as viewed from the right is recorded. Next, by illuminating a parallel laser beam 11 from above the mask pattern 10, a Lippmann hologram is recorded on a portion of the dry plate 9 corresponding to the mask pattern 10 by the principle of the contact copy method of the Lippmann hologram. In this case, the recorded Lippmann hologram is placed at the center of the copy master hologram 8, that is, on the right side of the
Since the hologram is a hologram that reproduces the hologram, the created hologram is located on the right side of the dry plate 9 (the position of the slit image 12).
Thus, a hologram in which the portion of the image (mask pattern 10) when viewed from the right looks shining. Next, the dry plate 9 is moved in the horizontal direction (right direction) by the width of the slit, and the mask pattern 10 is changed to the one viewed from the left from the previous one, and the laser beam 11 is illuminated. A Lippmann hologram of the next image is recorded. in this case,
The slit reproduction image 12 of the hologram is reproduced at a position closer to the left side of the dry plate 9 by the slit width than the previously recorded hologram. Therefore, this image is observed slightly from the left of the previous position. By repeating the above operations and multiplex-recording Lipman holograms one after another on the plate 9, an image of the subject 1 viewed from the right of the plate 9 and the object 1 viewed from the left of the plate 9. A hologram is created in which an image of the image viewed from the left can be observed.

As described above, a Lippmann holographic stereogram can be produced.

As described above, in this embodiment, when producing the Lippmann holographic stereogram, first, the subject 1 is photographed by the camera 2 to obtain a plane image when the subject 1 is viewed from various angles. , Create a stereogram original image (original image creation process), and then make an elongated slit image 1
A copy master hologram 6 is created by obtaining a shining Lippmann hologram on the entire surface for imaging 1 (copy master hologram creation step), and then a copy master hologram 8 created in this copy master hologram creation step And a mask 10 on which a pattern of the stereogram original image created in the original image creation process is drawn, and the dry plate 9 is placed on the dry plate 9. A Lippman stereogram is created by successively multiple-exposing different original patterns on the plate 9 by the contact copy method while moving the slit width to the right in the right direction (Lipman stereogram creation step). It was done.

Therefore, the following various effects can be obtained.

(A) As in the conventional one-step method, it is not necessary to perform special image processing for creating the original image, and the creation of the original image is hardly performed.

(B) Unlike the conventional one-step method, no trace of a slit remains on the final hologram, and no vertical line is formed in the image.

(C) Since the original image is directly used for the final hologram, not for the image once photographed on the hologram, the image quality is not deteriorated unlike the conventional recording by the two-step method. High image quality can be obtained.

(D) The copy master hologram 8
Holographic stereograms of the same size can be used in common, so once the copy master hologram 6 is created, the holographic stereogram can be created in one cycle of holographic imaging (one step). This makes it extremely easy to take a hologram (the production process is extremely simple) as compared with the conventional two-step method.

(E) Since the holographic stereogram is produced by the contact copy method, it is hardly affected by vibration during photographing, and stable photographing can be performed even with a photosensitive material having low sensitivity. .

As described above, Lippman's extremely high image quality
A holographic stereogram can be easily produced without trouble, and a display having a high image quality can be obtained as a display.

In the above embodiment, as a Lippman stereogram forming step, a dry plate 8 coated with a photosensitive material on the surface is arranged on the copy master hologram 8 formed in the copy master hologram forming step. At the same time, a mask 10 on which the pattern of the stereogram original image created in the original image creation process is drawn is placed on the dry plate 9, and the different original patterns are moved while moving the dry plate 9 to the right by the slit width. By performing multiple exposures one after another on the plate 9 by the contact copy method,
Although the case where a stereogram is created has been described, the present invention is not limited to this, and a dry plate 9 coated with a photosensitive material on the surface is placed on the copy master hologram 8 created in the copy master hologram creation step, and the original image is created. The stereogram original image created in the creation process is projected onto the plate 9 with a projection lens, and while the plate 9 is moved in the horizontal direction (right direction) by the width of the slit, different patterns of the original image are copied by the contact copy method. It is also possible to create a Lippmann stereogram by performing multiple exposures one after another.

In such a method, the aforementioned (a) to
In addition to the effect (e), the following effect can be obtained.

(F) Since the projected image is used as a pattern of the original image, the size of the original image pattern can be easily changed, thereby easily producing a hologram of an image of an arbitrary size. Can be.

(G) Even when a hologram of a large image is produced, the hologram can be produced with a small original image, so that the production process can be further simplified.

Further, in each of the above embodiments, the case where the dry plate 9 is moved in the horizontal direction (right direction) by the width of the slit in the Lippman stereogram creating process is described. The same effects can be obtained by applying the present invention similarly in the case of moving in the direction (upward or downward) by the width of the slit.

[0039]

As described above, according to the present invention, an original image forming step of obtaining an image of a subject and obtaining a planar image when the subject is viewed from various angles to create a stereogram original image, Obtain a shining Lippmann hologram that forms the slit image of the above, obtain a copy master hologram creation step of creating a copy master hologram, and on the copy master hologram created in the copy master hologram creation step, A dry plate coated with a photosensitive material on the surface is arranged, and a mask on which the pattern of the stereogram original image created in the original image creation process is placed is placed on the dry plate, and the dry plate is moved in a specific direction by the width of the slit. By moving, multiple exposures of different original patterns on the plate one after another by the contact copy method,
A Lippman stereogram creation process for creating a Lippman stereogram (or a dry plate coated with a photosensitive material on the surface is placed on the copy master hologram created in the copy master hologram creation step, and an original image creation step By projecting the stereogram original created on the plate on the plate with a projection lens, and moving the plate in the specific direction by the width of the slit, multiple exposures of different original patterns are successively exposed on the plate by the contact copy method. , A Lippman stereogram creation process for creating a Lippman stereogram), which makes it possible to easily produce extremely high-quality Lippman holographic stereograms without any hassle, and as a display Lipman holograph with good image quality Tsu method for manufacturing a click stereogram can provide.

[Brief description of the drawings]

FIG. 1 shows a Lippmann holographic image according to the invention.
FIG. 3 is a perspective view showing an example of an original image creation in a method for creating a stereogram.

FIG. 2 is a perspective view showing an example of creating a copy master hologram in the embodiment.

FIG. 3 is an exemplary perspective view showing an example of Lippman stereogram creation in the embodiment.

FIG. 4 is a schematic diagram showing an example of original image creation in a conventional one-step method.

FIG. 5 is a perspective view showing an example of Lippman holographic stereogram creation in a conventional one-step method.

FIG. 6 is a schematic diagram showing an example of creating a master hologram in a conventional two-step method.

FIG. 7 is a schematic diagram showing an example of Lippmann hologram creation in a conventional two-step method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... Camera, 3 ... Laser beam, 4 ... Master hologram, 5 ... Slit, 6 ... Dry plate, 7 ... Laser beam, 8 ... Copy master hologram, 9 ... Dry plate, 10 ... Mask, 11 ... Laser beam, 12 ... Slit image.

Claims (2)

(57) [Claims] 1. An original image forming step of obtaining an image of a subject and obtaining a planar image when the subject is viewed from various angles to create an original stereogram, and a shining Lippman which forms an elongated slit image Obtaining a hologram and creating a copy master hologram, and forming a copy master hologram; and, on the copy master hologram created in the copy master hologram creation step, a dry plate having a surface coated with a photosensitive material. While arranging, a mask on which the pattern of the stereogram original image created in the original image creation step is drawn is placed on the dry plate, and while moving the dry plate in a specific direction by the width of the slit, a different original image A Lippman stereogram is created by successively multiple exposure of the pattern on the plate by the contact copy method. Lippmann holographic stereogram manufacturing method of which is characterized in that it consists a Lippmann-stereogram producing process. 2. An original image forming step of obtaining an image of a subject and obtaining a planar image when the subject is viewed from various angles to create a stereogram original image, and a shining Lippman which forms an elongated slit image. Obtaining a hologram and creating a copy master hologram, and forming a copy master hologram; and, on the copy master hologram created in the copy master hologram creation step, a dry plate having a surface coated with a photosensitive material. While arranging, projecting the stereogram original image created in the original image creation step on the dry plate with a projection lens, and moving the dry plate in a specific direction by the width of the slit, the pattern of the different original image by the contact copy method. By multiple exposure one after another on the dry plate,
A method for producing a Lippman holographic stereogram, comprising: a Lippman stereogram producing step of producing a Lippman stereogram.