JPH0720768A - Color lippmann hologran and its production - Google Patents

Abstract

PURPOSE:To easily and stably produce a Lippmann-type hologram with one color of least beam without requiring an intricate photographic optical system and without requiring high skill. CONSTITUTION:This process for production of the Lippmann-type hologram by superposing Lippmann-type holograms of three colors; blue, green and red comprises respectively separately recording three sheets of the images reconstructed by one color of the laser beam from the three Lippmann-type holograms of a laser reconstruction type subjected to color sepn. as the Lippmann-type holograms on photosensitive material 8 for Lippmann-type holograms, subjecting three sheets of these Lippmann-type holograms to development processing and respectively properly changing the thicknesses of the respective photosensitive materials to form regenerated colors of desired colors, then superposing three sheets of such Lippmann-type holograms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Lippmann hologram in which Lippmann holograms of three colors of blue, green and red are superposed and a method for producing the same, and particularly, without requiring a complicated photographing optical system, The present invention also relates to a color Lippmann hologram capable of easily and stably producing a color Lippmann hologram with a laser beam of one color without requiring high skill and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a Lippmann hologram can be used as a display or a security because of its realistic three-dimensional display effect and high-density recording property, and a reproduction color of an image becomes a single color. ), Green (G), and red (R) laser lights of three colors are used for multiple exposure of holograms of three colors, or by separately recording and superimposing, a color hologram can be produced. it can.

FIG. 5 is a schematic diagram showing a configuration example of a photographing optical system for realizing a conventional method for producing a color Lippmann hologram.

In FIG. 5, the red, green, and blue laser lights from the three color lasers 1R, 1G, and 1B of red, green, and blue are reflected by the reflection mirrors 2R, 2G, and 2B, respectively, and are reflected by the reflection mirror 3. It is reflected and further split by the beam splitter 4 into two laser beam lights, a reference beam and an object beam.

The reference light split by the beam splitter 4 is sequentially reflected by the reflecting mirrors 5 and 6, diffused by the objective lens 7, and the photosensitive material 8 for hologram is used.
Is incident on one surface of.

The object light split by the beam splitter 4 is reflected by a reflection mirror 9, diffused by an objective lens 10 and then reflected by a concave mirror 11, and is passed through a laser reproduction hologram 12 that has been photographed in advance for hologram. Is incident on the other surface of the photosensitive material 8.

In this case, with respect to the laser lights of the three colors of red, green and blue from the lasers 1R, 1G and 1B, only the laser light of one color is sequentially selected as the reference light and the object light. And the object light are interfered with each other to obtain a color Lippmann hologram.

By the way, in the method of manufacturing such a color Lippmann hologram, as described above, since the laser light of three colors of red, green and blue is used,
Reflecting mirrors 2R, 2G, 2 according to the color (wavelength) of light
B, 3, beam splitter 4, reflecting mirrors 5, 6, objective lens 7, reflecting mirror 9, objective lens 10, concave mirror 1
It is necessary to replace or adjust optical elements such as 1.

As a result, not only is the handling of the optical elements extremely troublesome, but as shown in FIG. 5, complicated photographing optics in which laser lights of three colors of blue, green and red are aligned on the same optical axis. If the system is not used, the position of the reproduced image will be displaced, which will cause color shift.

Further, the image type Lippmann hologram is produced by the two-step method (a method of photographing a laser reproducing hologram as a first step and photographing a Lippmann hologram from the reproduced image in the second step). In each of the first step and the second step, a complicated photographing optical system having the same optical axis for the laser lights of three colors of blue, green and red is required.

In addition, different exposure conditions and developing conditions for each of the three colors of blue, green and red laser light must be ascertained, which requires a high level of skill in manufacturing.

[0012]

As described above, the conventional method for producing a color Lippmann hologram has a problem that not only a complicated photographing optical system is required, but also high skill is required.

The present invention has been made to solve the above-mentioned problems, and does not require a complicated photographing optical system,
An object of the present invention is to provide an extremely reliable color Lippmann hologram capable of easily and stably producing a color Lippmann hologram with a laser beam of one color without requiring high skill, and a method for producing the same. To do.

[0014]

In order to achieve the above-mentioned object, a method for producing a color Lippmann hologram by superimposing Lippmann holograms of three colors of blue, green and red is described in claim 1. In the invention of 3, the images reproduced by the laser light of one color from the three color-separated laser reproduction holograms are separately recorded on the photosensitive material for hologram as Lippmann holograms. After the development processing is performed on the one sheet of Lippmann hologram, the thickness of the photosensitive material is appropriately changed to obtain a reproduced color of a desired color, and thereafter, these three sheets of Lippmann hologram are superposed.

According to the second aspect of the present invention, the images reproduced by the laser light of one color from the three color-separated laser reproduction holograms are used as Lippmann holograms on the hologram photosensitive material, respectively. Separately recorded, then, using these three Lippmann holograms as master holograms, three sheets are separately reproduced on the photosensitive material for hologram by a contact exposure method using one color laser beam, and then,
After the development processing is performed on the three duplicated holograms, the thickness of the photosensitive material is appropriately changed to obtain a reproduction color of a desired color, and thereafter, the three Lippmann holograms are superimposed. .

Further, the invention according to claim 3 is made by the manufacturing method according to claim 1 or 2.

[0017]

Therefore, in the color Lippmann hologram and the method for producing the same according to the present invention, since a laser reproduction hologram and a Lippmann hologram are recorded by a laser beam of one color, a complicated photographing optical system is not required and highly skilled. Is not necessary either. Thereby, a color Lippmann hologram can be easily manufactured with one color of laser light.

Further, by using the same photosensitive material having sensitivity to one color laser beam for all three colors of blue, green and red, the performance of the color hologram is hardly influenced by the performance of the photosensitive material. As a result, a color Lippmann hologram can be stably produced with a laser beam of one color.

Further, in the method for producing a color Lippmann hologram of the invention described in claim 2, the color Lippmann hologram of the invention described in claim 1 is reproduced in three steps (the above-mentioned steps 2 and 3 are reproduced by contact exposure). Even in the case of mass production with), photographing and copying can be easily performed with a laser beam of one color.

[0020]

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

FIG. 1 is a schematic diagram showing a configuration example of a photographing optical system for realizing a method for producing a color Lippmann hologram according to the first embodiment of the present invention.

In FIG. 1, reference numeral 21 is a laser, and 22, 2
3 and 24 are reflection mirrors, 25 is a beam splitter, 26 is a reflection mirror, 27 is an objective lens, 28 is a collimator lens, 29 is a reflection mirror, 30 is a projection device,
Reference numeral 31 is a stage, 32 is a screen, 33 is a dry plate holder and mask, 34 and 35 are reflection mirrors, 36 is an objective lens, 37 is a collimator lens, and 38 is a reflection mirror. .

FIG. 2 is a schematic view showing a structural example of a photographing optical system for realizing the method of manufacturing a color Lippmann hologram according to the first embodiment of the present invention. The same elements as those in FIG. The description thereof will be omitted and only different parts will be described here.

That is, in FIG. 2, of the three color lasers 1R, 1G and 1B of red, green and blue shown in FIG. 5, the two color lasers 1R and 1G of red and green are omitted and one color of blue is omitted. Laser 1B only, red,
The green and blue reflection mirrors 6R, 6G and 6B and the lenses 7R, 7G and 7B are provided.

Next, a method of manufacturing a color Lippmann hologram according to the first embodiment of the present invention will be described.

The manufacturing method of the color Lippmann hologram according to this embodiment is performed as follows.

That is, first, a laser reproducing hologram is recorded on a silver salt photosensitive material ILFORD-SP695T dry plate for hologram by a photographing optical system as shown in FIG. 1 and a normal developing process is performed.

At this time, as the laser 21, blue light of 488 nm of an argon ion laser is used.

Further, this laser reproduction hologram is
A holographic stereogram is used because the three separated colors of blue, green, and red are captured separately. Since the holographic stereogram synthesizes holograms based on plane photographs from multiple directions, it is divided into three colors of blue, green, and red by ordinary color separation work of photographs.

Next, the Lippmann holograms for the three colors of blue, green and red are photographed by the photographing optical system as shown in FIG. At this time, as the photosensitive material 8 for hologram, an ILFORD-SP672T silver salt photosensitive film is used, and ordinary developing processing is performed.

As the photographing wavelength, blue light of 488 nm of the argon ion laser 1B is used as in the laser reproducing type. At this time, the incident angle of the reference light is made different for each of the three holograms in consideration of the fact that the thickness of the photosensitive material changes and the reproduction angle of the image changes in the subsequent process.

Next, since the Lippmann hologram photographed with one color of laser light is reproduced only in the color of the laser light, after the hologram is developed, the thickness of the photosensitive material is appropriately changed, The reproduction color is the desired color.

For example, when a silver salt light-sensitive material is used as the light-sensitive material, a substance capable of penetrating into gelatin of the silver salt light-sensitive material to change its thickness and keeping the changed thickness as it is. Is made by using. As such a substance, for example, a D-sorbitol aqueous solution or the like can be considered.

As another example, "Japanese Patent Application No. 2-
The photopolymer for hologram recording described in Japanese Patent No. 3082 ”is formed by the process described in Japanese Patent Application No. 3-46687”.

As a method of changing the thickness of the photosensitive material,
When contracting the hologram, the holograms of all three colors are recorded with red laser light, and the reproduction color is changed to blue or green by processing the red one as it is and the blue or green one with a different degree of contraction. The desired three-color Lippmann hologram can be obtained.

On the contrary, in the case of swelling the hologram, the holograms of three colors are recorded with blue laser light, and the blue one is processed as it is, while the green and red ones are processed by changing the swelling degree. By changing the reproduction color to or red, a desired three-color Lippmann hologram can be obtained.

Similarly, when the hologram is swollen and shrunk, the holograms of three colors are recorded with a green laser beam, the blue one is shrunk, and the red one is swollen to reproduce blue or red. By changing the color, the desired three-color Lippmann hologram is obtained.

In the case of the present embodiment, since all three Lippmann holograms are recorded by the blue laser beam, the blue one remains as it is, and the remaining two Lippmann holograms are the green ones in the D-sorbitol aqueous solution. 60 g
/ L for 5 minutes, and for red, by dipping in 150 g / l of D-sorbitol aqueous solution for 5 minutes and then drying, the reproduction color is changed to green or red, and the desired three-color Lippmann hologram is obtained. It will be.

After that, the three Lippmann holograms thus obtained are aligned with each other in position and attached to each other with an adhesive or the like to obtain a color Lippmann hologram.

FIG. 3 is a sectional view showing an example of the layer structure of the color Lippmann hologram produced by the above method.

That is, as shown in FIG. 3, on the substrate 41, the red hologram 42R, the green hologram 42G,
The blue hologram 42B is sequentially attached to the adhesive layers 43, 44, 4
5, and a transparent protective layer 46 is further provided on the blue hologram 42B.

In the method of manufacturing the color Lippmann hologram according to the present embodiment as described above, by recording both the laser reproduction hologram and the Lippmann hologram with the laser beam of one color (blue), as described above,
Reflecting mirrors 2, 3, beam splitter 4, reflecting mirrors 5, 6R, 6G, 6B, objective lenses 7R, 7G, 7B,
There is no need to replace or adjust the optical elements such as the reflecting mirror 9, the objective lens 10 and the concave mirror 11.

As a result, not only the handling of the optical elements is extremely easy, but also a complicated photographing optical system is not required and high skill is not required.

Thus, a color Lippmann hologram can be easily produced with one color of laser light.

By using the same photosensitive material having sensitivity to one color (blue) laser beam for all three colors of blue, green and red, the performance of the color hologram is influenced by the performance of the photosensitive material. It is hard to be done.

As a result, a color Lippmann hologram can be stably produced with one color of laser light.

As described above, in this embodiment, blue, green,
When making a color Lippmann hologram by superimposing Lippmann holograms of three colors of red, an image reproduced by one laser beam from three color-separated laser reproduction holograms is used as a Lippmann hologram for hologram. Each of the three sheets is separately recorded on the photosensitive material, and then the development processing is performed on the three Lippmann holograms, and then the thickness of each photosensitive material is appropriately changed, so that blue is blue, green is green, If red, the reproduction color is a desired color such as red, and then these three Lippmann holograms are superposed.

Therefore, since the laser reproduction hologram and the Lippmann hologram are recorded by the laser light of one color (blue), the reflection mirrors 2, 3, the beam splitter 4, the reflection mirrors 5, 6R, 6G, 6B are used as in the conventional case. ,
There is no need to replace or adjust the optical elements such as the objective lenses 7R, 7G and 7B, the reflection mirror 9, the objective lens 10 and the concave mirror 11.

As a result, not only the handling of the optical elements is extremely easy, but also a complicated photographing optical system is not required and high skill is not required.

That is, in the past, since holograms were recorded by laser lights of three colors of blue, green and red, complicated photographing having the same optical axis for the laser lights of three colors of blue, green and red. An optical system was needed, but it is no longer needed.

Also, in the same way, in the prior art, since holograms are recorded by laser lights of three colors of blue, green and red, the laser lights of three colors of blue, green and red are respectively recorded.
It was necessary to grasp the respective exposure conditions and development conditions, which required a high level of skill in manufacturing, but this becomes unnecessary.

Thus, a color Lippmann hologram can be easily produced with one color of laser light.

Further, since the same photosensitive material having sensitivity to one color (blue) laser light is used for all three colors of blue, green and red, the performance of the color hologram is influenced by the performance of the photosensitive material. Hateful.

As a result, a color Lippmann hologram can be stably produced with one color of laser light.

Next, a method of manufacturing a color Lippmann hologram according to the second embodiment of the present invention will be described.

The method of manufacturing the color Lippmann hologram according to the present embodiment is performed by the following method.

That is, first, as in the case described above, a laser reproducing hologram is made into a hologram by using a photographing optical system as shown in FIG.
-Record on SP695T dry plate and perform normal development processing.

At this time, as the laser 21, blue light of 488 nm of an argon ion laser is used.

Further, this laser reproducing hologram is
A holographic stereogram is used because the three separated colors of blue, green, and red are captured separately. Since the holographic stereogram synthesizes holograms based on plane photographs from multiple directions, it is divided into three colors of blue, green, and red by ordinary color separation work of photographs.

Next, as in the case described above, the Lippmann holograms for the three colors of blue, green and red are photographed by the photographing optical system as shown in FIG. At this time, the photosensitive material 8 for hologram is ILFORD-SP672T.
Normal development processing is performed using a silver salt photosensitive film.

As the photographing wavelength, blue light of 488 nm of an argon ion laser is used as in the laser reproducing type. At this time, the incident angle of the reference light is made different for each of the three holograms in consideration of the fact that the thickness of the photosensitive material changes and the reproduction angle of the image changes in the subsequent process.

Next, the three Lippmann holograms thus obtained are used as master holograms 51, and as shown in FIG. 4, ILFO which is a hologram photosensitive material.
The RD-SP672T silver salt photosensitive film 52 is contact-exposed with blue light of 488 nm of an argon ion laser, and three sheets are separately reproduced.

Since the three holograms reproduced by the laser beam of one color are reproduced only in the color of the laser beam, after the hologram is developed, the thickness of the photosensitive material is appropriately changed, The reproduction color is the desired color.

In this case, as a method of changing the thickness of the light-sensitive material, in the same way as in the above-mentioned case, when contracting the hologram, recording is performed with a red laser beam for all three color holograms, and the red one is used as it is. By changing the contraction degree for blue and green, the reproduced color is changed to blue and green, and the desired three-color Lippmann hologram is obtained.

On the contrary, in the case of swelling the hologram, all the three color holograms are recorded by the blue laser light, and the blue one is processed as it is, while the green and red ones are processed by changing the swelling degree. By changing the reproduction color to or red, a desired three-color Lippmann hologram can be obtained.

Similarly, when the hologram is swollen and shrunk, all three color holograms are recorded with a green laser beam, and the blue one is shrunk and the red one is swollen to reproduce blue or red. By changing the color, the desired three-color Lippmann hologram is obtained.

In the case of this embodiment, since all three holograms are duplicated by the blue laser light, the blue hologram is used as it is, and the remaining two holograms are used for the green hologram, as in the case described above. Is D-sorbitol aqueous solution 60 g /
l for 5 minutes, for red, by soaking in D-sorbitol aqueous solution 150 g / l for 5 minutes and then drying,
By changing the reproduction color to green or red, desired three-color Lippmann holograms can be obtained.

After that, the three Lippmann holograms thus obtained are aligned with each other in position and attached to each other with an adhesive or the like to obtain a color Lippmann hologram.

FIG. 3 is a sectional view showing an example of the layer structure of the color Lippmann hologram produced by the above method.

That is, as in the case described above, as shown in FIG. 3, the red hologram 42R, the green hologram 42G, and the blue hologram 42B are sequentially arranged on the base material 41.
Bonded via the adhesive layers 43, 44 and 45,
Furthermore, a transparent protective layer 46 is provided on the blue hologram 42B.
Is provided.

In the method for producing the color Lippmann hologram according to the present embodiment as described above, by recording both the laser reproduction hologram and the Lippmann hologram by the laser beam of one color (blue), as described above,
Reflecting mirrors 2, 3, beam splitter 4, reflecting mirrors 5, 6R, 6G, 6B, objective lenses 7R, 7G, 7B,
There is no need to replace or adjust the optical elements such as the reflecting mirror 9, the objective lens 10 and the concave mirror 11.

As a result, not only the handling of the optical elements is extremely easy, but also a complicated photographing optical system is not required and high skill is not required.

As a result, a color Lippmann hologram can be easily produced with one color laser light.

By using the same photosensitive material having sensitivity to one color (blue) laser light for all three colors of blue, green and red, the performance of the color hologram is influenced by the performance of the photosensitive material. It is hard to be done.

As a result, a color Lippmann hologram can be stably produced with one color of laser light.

Further, even when the hologram is mass-produced in three steps (duplication by contact exposure in the above-mentioned second step and third step), all photographing and duplication can be easily performed with a laser beam of one color. it can.

As described above, in this embodiment, blue, green,
When making a color Lippmann hologram by superimposing red Lippmann holograms of three colors, an image reproduced by one color laser light from three color-separated Fresnel holograms is used as a Lippmann hologram for photosensitive exposure for holograms. Each of the three pieces is separately recorded on the material, and then the three pieces of the Lippmann hologram are used as master holograms, and three pieces are separately reproduced on the photosensitive material for hologram by the contact exposure method using a laser beam of one color. After the development processing is performed on the three duplicated holograms, the thickness of each photosensitive material is appropriately changed,
The reproduction color is a desired color such as blue for blue, green for green, and red for red. After that, these three Lippmann holograms are superposed.

Therefore, since the laser reproduction hologram and the Lippmann hologram are recorded by the laser light of one color (blue), the reflection mirrors 2, 3, the beam splitter 4, the reflection mirrors 5, 6R, 6G, 6B are conventionally used. ,
There is no need to replace or adjust the optical elements such as the objective lenses 7R, 7G and 7B, the reflection mirror 9, the objective lens 10 and the concave mirror 11.

As a result, not only the handling of the optical elements is extremely easy, but also a complicated photographing optical system is not required and high skill is not required.

That is, in the past, since holograms were recorded by laser lights of three colors of blue, green and red, complicated photographing with the same optical axis for the laser lights of three colors of blue, green and red. An optical system was needed, but it is no longer needed.

Further, similarly, in the prior art, since holograms are recorded by laser lights of three colors of blue, green and red, the laser lights of three colors of blue, green and red are respectively recorded.
It was necessary to grasp the respective exposure conditions and development conditions, which required a high level of skill in manufacturing, but this becomes unnecessary.

Thus, a color Lippmann hologram can be easily produced with one color laser light.

Further, since the same photosensitive material having sensitivity to one color (blue) laser light is used for all three colors of blue, green and red, the performance of the color hologram is influenced by the performance of the photosensitive material. Hateful.

As a result, a color Lippmann hologram can be stably produced with one color of laser light.

Furthermore, even in the case of mass-producing the above hologram in three steps (duplication by contact exposure in the above-mentioned second step and third step), all photographing and duplication should be easily performed with a laser beam of one color. You can

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

(A) In each of the above embodiments, the case where the laser reproduction hologram and the Lippmann hologram are recorded / reproduced by the blue laser light as the laser light of one color has been described, but the present invention is not limited to this. It goes without saying that a laser reproduction hologram or a Lippmann hologram may be recorded / reproduced by using green or red laser light as the laser light.

(B) In each of the above embodiments, the case where the red hologram, the green hologram and the blue hologram are sequentially superposed on the base material has been described, but the superposition order is not limited to this order. Not a thing.

[0089]

As described above, according to the present invention,
When making a color Lippmann hologram by superimposing three color Lippmann holograms of blue, green, and red, the image reproduced by one laser beam from three color-resolved holograms of laser reproduction is separated into Lippmann holograms. As a result, the three recording materials are separately recorded on the hologram photosensitive material, and the three Lippmann holograms are subjected to development processing. Then, the thickness of each photosensitive material is appropriately changed to reproduce a desired color. Then, after that, these three Lippmann holograms are superposed or an image reproduced by one color laser beam from three color-separated laser reproduction holograms is used as a Lippmann hologram on a photosensitive material for hologram. Record each three separately, and then record these three Lippman holograms As a result, three sheets are separately reproduced on the photosensitive material for hologram by a contact exposure method using one color laser beam, and then the three holograms thus reproduced are subjected to development processing, and then the thickness of each photosensitive material. To obtain a reproduction color of a desired color, and thereafter, these three Lippmann holograms are superposed, so that a complicated photographing optical system is not required and high skill is required. Thus, a highly reliable color Lippmann hologram capable of easily and stably producing a color Lippmann hologram with a laser beam of one color and a method for producing the same can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration example of a photographing optical system for realizing a method of manufacturing a color Lippmann hologram according to first and second embodiments of the present invention.

FIG. 2 is a schematic diagram showing a configuration example of a photographing optical system for realizing the method of manufacturing a color Lippmann hologram according to the first and second embodiments of the present invention.

FIG. 3 is a cross-sectional view showing an example of the layer structure of the color Lippmann hologram produced in the same example.

FIG. 4 is a schematic diagram showing a configuration example of a photographing optical system for realizing a method of manufacturing a color Lippmann hologram according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing a configuration example of a photographing optical system for realizing a conventional method for producing a Color Lippmann hologram.

[Explanation of symbols]

1R, 1G, 1B ... Red, green and blue lasers, 2
R, 2G, 2B ... Reflective mirror, 3 ... Reflective mirror, 4 ... Beam splitter, 5, 6, 6R, 6G, 6B ... Reflective mirror, 7, 7R, 7G, 7B ... Objective lens, 8 ... Photosensitive material for hologram , 9 ... Reflective mirror, 10 ... Objective lens, 11 ... Concave mirror, 12 ... Laser reproduction hologram,
21 ... Laser, 22, 23, 24 ... Reflecting mirror, 25
... Beam splitter, 26 ... Reflecting mirror, 27 ... Objective lens, 28 ... Collimator lens, 29 ... Reflecting mirror,
30 ... Projection device, 31 ... Stage, 32 ... Screen,
33 ... Dry plate holder and mask, 34, 35 ... Reflecting mirror, 36 ... Objective lens, 37 ... Collimator lens, 3
8 ... Reflective mirror, 41 ... Base material, 42R ... Red hologram, 42G ... Green hologram, 42B ... Blue hologram, 43, 44, 45 ... Adhesive layer, 46 ... Transparent protective layer.

Claims (3)

[Claims] 1. A method for producing a color Lippmann hologram by superimposing three-color Lippmann holograms of blue, green, and red, wherein one of three color-separated laser reproduction holograms is used.
The images reproduced by the colored laser beams are separately recorded as three Lippmann holograms on each of the photosensitive materials for holograms, and the three Lippmann holograms are subjected to development processing, and then the thickness of the photosensitive material is increased. To obtain a reproduction color of a desired color, and thereafter, the three Lippmann holograms are superposed on each other, and a method for producing a color Lippmann hologram is characterized. 2. A method for producing a color Lippmann hologram by superimposing three-color Lippmann holograms of blue, green and red, wherein one of three color-separated laser reproduction holograms is used.
The images reproduced by the colored laser beams are separately recorded as three Lippmann holograms on the hologram photosensitive material, and then these three Lippmann holograms are used as master holograms to form one color on the hologram photosensitive material. The three reproduced holograms are separately reproduced by the contact exposure method using the laser light, and the three reproduced holograms are subjected to development processing. Then, the thickness of the photosensitive material is appropriately changed to reproduce a desired color. Then, after that, the method for producing a color Lippmann hologram is characterized in that the three Lippmann holograms are superposed. 3. A color Lippmann hologram manufactured by the manufacturing method according to claim 1 or 2.