JPH04263282A - Method and device for manufacture of color reflection type hologram - Google Patents

Abstract

PURPOSE:To prevent the base surface of a photosensitive material film for duplication from being wetted with swelling liquid by eliminating the problem of color reproducibility due to a fine difference in swelling state as to a system which form the color reflection type hologram by providing plural processes of swelling and exposure in series. CONSTITUTION:In each of the processes of the system which form the color reflection type hologram by providing the processes R, G, and B of swelling and exposure in series, thickness sensors 26R, 26G, and 26B measure the thickness of a sensitive agent and the feed speed of the photosensitive material film 20 for duplication is so controlled that the degree of swelling reaches a value determined by swelling liquid used in the process. The swelling state of the photosensitive material varies with none of the temperature, humidity, etc., in the room wherein the swelling is performed and in each process, the swelling liquid is applied to only the sensing agent surface side of a silver salt photographic film to manufacture the color reflection type hologram with good color reproducibility stably and efficiently in quantities.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mass-producing holograms and an apparatus therefor, and more particularly to a system for producing reflective holograms.

0002

BACKGROUND OF THE INVENTION The present applicant proposed a method disclosed in Japanese Patent Application No. 1-57281 as a method for mass-reproducing Lippmann holograms. The contents will be explained below.

FIG. 4 is a diagram for explaining the principle of this duplication method, with FIG. 4(a) being a sectional view and FIG. 4(b) being a perspective view. In the figure, 4 is an original pasting drum, 5 is a reflective hologram original, 6 is a photosensitive material film for duplication, and 7 is a laser beam.

In the figure, a cylindrical original drum 4 is used, a reflective hologram original 5 is pasted thereon, a photosensitive material film 6 for duplication is wound on this drum, and the drum and film are rotated at the same speed to perform duplication. By irradiating the laser beam 7 from the side of the photosensitive material film, the reflected light and the irradiated light are caused to interfere, and the interference fringes are recorded on the film, thereby making it possible to reproduce a hologram. In this way, by pasting the original onto the entire drum cylinder and supplying the film one after another, production efficiency can be greatly improved compared to conventional duplication methods, making it possible to perform mass production.

FIG. 5 is a diagram showing a configuration for mass-duplicating holograms using the duplication method shown in FIG. 12 is a film unwinding device, 12 is a film winding device, 13 is an index matching liquid dropping device, 14 is a nip roller, 15 is a drying device, 16
is a cylindrical lens, 17 is a linear laser beam,
18 is a photosensitive material film for duplication.

In the figure, a photosensitive material film 18 for duplication is shown.
is continuously fed out from the film unwinding device 11, and immediately before the original 8 and the film 18 are brought together on the drum 9, an index matching liquid, such as xylene, is dripped by the dropping device 13.
The liquid is dripped between the original plate and the film. Furthermore, the index matching liquid is spread uniformly between the original plate and the film by the nip roller 14. Then, the laser beam from the laser oscillator 10 is expanded into a linear beam 17 by the cylindrical lens 16 and irradiated onto the drum.
Continuously reproduce holograms on film. Thereafter, the film is dried in a drying device 15 and wound up in a winding device 12. Such a method can prevent dropouts and decreases in diffraction efficiency, and can mass-produce high-quality reproductions.

As is generally known, if the interval between interference fringes is d, the wavelength is λ, the refractive index is n, and the angle between the object beam and the reference beam is θ, then the following equation is obtained. Therefore, the factor that determines the reproduced color of a Lippmann hologram is the interval between the interference fringes formed in the photosensitive material. By increasing this interval, the reproduced color shifts to longer wavelengths, and by decreasing the interval, the reproduced color shifts to shorter wavelengths. shift to. Therefore, as shown in FIG. 6(a), the spacing between interference fringes can be reduced by swelling and drying the photosensitive material, exposing it to light, releasing the swelling, shrinking it, and developing it. It can be shifted to shorter wavelengths. The shift amount at this time is as shown in Figure 6 (b) when the photosensitive material is immersed in a D-sorbitol aqueous solution and then dried, which is a swelling process, and then exposed to He-Ne laser light (633 nm) and developed. It has the characteristics shown below. That is, when the concentration of D-sorbitol aqueous solution is 0%, it is red;
Orange at 5% concentration, yellow at 6-7% concentration, yellow-green at 10% concentration, green at 14% concentration, and green at 20% concentration.
If the density is 30%, the color will be blue, and if the density is 30%, the color will be purple. Therefore, when photographing from the holographic stereogram of R, the density is 0.
%, G, and B are preferably treated with a D-sorbitol aqueous solution of about 10% and 20%, respectively, and then exposed. In addition to the D-sorbitol aqueous solution, various saccharide aqueous solutions such as a triethanolamine aqueous solution and a maltose aqueous solution can be used as the swelling treatment liquid.

In this way, after performing the swelling treatment on the photosensitive material and then exposing it to light three times for R, G, and B, a natural color Lippmann hologram is produced by performing development according to an appropriate development recipe. is obtained.

[0009] Applying the above principle, it is possible to reproduce a color hologram. For example, when a silver salt material is used as a photosensitive material film for duplication, a swelling liquid is applied to the surface of the photosensitive material film before exposure to swell the sensitizer, and the wavelength of the laser beam is A replica can be obtained with the following reproduction light: That is, multiple sets of the exposure process shown in FIG. 5 plus a swelling treatment process are arranged in series, and in each set of processes, different original plates are pasted on the original plate pasting drum to change the degree of swelling, and the duplicates are reproduced. Since the reproduction wavelength of each pattern reproduced from each original plate can be changed, a multicolor part-color hologram can be obtained.

[0010] Also, three sets of swelling and exposure processes are connected, and in each set of processes, the R, G, and B plates are pasted on the original plate pasting drum, and the R, G, and B plate masters and their respective If you set the swelling degree to reproduce the color, R,
It is also possible to mass reproduce natural color holograms with triple exposure of G and B.

In the case of triple exposure, it is necessary to align the plate and the film, so it is necessary to provide a device for aligning the plate and the film. for example,
This can be accomplished by drilling holes in the duplicating photosensitive material film for multiple exposure alignment and providing matching teeth on each master drum.

0012

[Problems to be Solved by the Invention] As described above, the present applicant has already installed a plurality of sets in series in which a swelling treatment process is added to the exposure process as shown in FIG. It was proposed that multiple-exposure natural color holograms could be mass-produced by pasting different original plates on each plate and changing the degree of swelling, but no specific method or equipment was proposed. .

When a color reflection hologram is reproduced by serially performing multiple swelling and exposure steps in this way, the swelling liquid actually wets the base surface of the photosensitive material film for duplication and imparts adhesive properties to the material. When the film is wound up after multiple exposure and before development, the base surface and photosensitive surface come into contact,
The adhesive nature of the base surface destroys the exposed photosensitive surface. Furthermore, the state of swelling of the photosensitive material varies slightly depending on the temperature, humidity, etc. of the room in which the material is swollen, which poses a problem in color reproducibility.

The present invention was made in view of the above circumstances, and its purpose is to eliminate subtle differences in the swelling state in a system for manufacturing color reflection holograms by serially performing multiple sets of swelling and exposure steps. To provide a method and an apparatus for stably and efficiently mass-producing color reflective holograms by solving the problem of color reproducibility due to color reproducibility and the problem that the base surface of a photosensitive material film for duplication gets wet with swelling liquid. It is.

[0015]

[Means for Solving the Problems] A method for producing a color reflection hologram of the present invention which achieves the above object is to affix a reflection hologram as an original onto a drum, and apply a swelling liquid to the drum surface to apply a sensitive material. A photosensitive material film for duplication made of a swollen silver halide photographic film is wound around the original plate, and the rotational speed of the drum is matched with the feeding speed of the photosensitive material film for duplication, and a laser beam is applied from the side of the photosensitive material film for duplication. The process of irradiating the original plate and continuously recording the reflective hologram information on the photosensitive material film for duplication is performed in series, and in each process, different original plates are pasted onto the original plate mounting drum to vary the degree of swelling. In the method for manufacturing a color reflection hologram, in which when the reproduction is reproduced, the reproduction wavelength of each pattern reproduced from each original plate is changed to produce a multicolor reflection hologram, the degree of swelling is determined in each step. This method is characterized by controlling the feeding speed of the photosensitive material film for duplication so that it approximately reaches a value determined by the swelling liquid used in the process.

In this case, by applying the swelling liquid to the silver salt photographic film in each step only on the sensitive side,
This solves the problem of the base surface of the photosensitive material film for duplication getting wet with the swelling liquid.

In each step, after applying the swelling liquid, the swelling liquid that has permeated the coating is dried, and before the original plate and the photosensitive material film for duplication are brought into close contact with each other, an index matching liquid is dropped between the two to form an index. It is desirable to achieve close contact through a matching liquid and to dry the index matching liquid after exposure. It is desirable to change it according to the speed.

[0018] It is also possible to gradually increase the degree of swelling from upstream to downstream processes, and in the most upstream process, application of the swelling liquid and drying of the swelling liquid may not be performed.

By the way, the degree of swelling in each step is preferably measured by measuring the thickness of the sensitizer.

[0020] In order to produce a natural color hologram, three different reflective hologram masters having the same wavelength but reproduced at different reproduction light irradiation angles are prepared as masters to be pasted on the master pasting drum in each step. It is preferable that the information of each reflective hologram original plate be superimposed and duplicated onto one photosensitive material film for duplication.

[0021] An apparatus for carrying out such a method for producing a color reflection hologram is provided with a feeding means and a winding means for a photosensitive material film for duplication, and at least the following steps are carried out in each step.
Swelling liquid applying means, swelling liquid squeezing means, swelling liquid drying means, sensitizer thickness measuring means, index matching liquid dropping means,
An index matching liquid drying means is provided, and the feeding speed of the photosensitive material film for duplication feeding means is controlled based on the thickness data obtained from the sensitive material thickness measuring means in each process, and the swelling liquid drying means and index matching in each process are controlled. It is preferable that the structure is such that the outputs of the liquid dropping means and the index matching liquid drying means are controlled, and that the swelling liquid applying means in each step applies the swelling liquid only to one side of the photosensitive material film for duplication. is desirable.

[0022]

[Operation] In the present invention, in a system in which a color reflection hologram is produced by serially performing multiple sets of swelling and exposure steps, the degree of swelling in each step is approximately the same as the value determined by the swelling liquid used in that step. As the feeding speed of the photosensitive material film for duplication is controlled,
The swelling state of the photosensitive material does not change depending on the temperature, humidity, etc. in the room in which the swelling is performed, the color reproducibility is good, and color reflection holograms can be produced in large quantities stably and efficiently.

By applying the swelling liquid to the silver halide photographic film in each step only on the sensitive side, the base surface of the photosensitive material film for duplication will be wetted with the swelling liquid and the film will not be wound. Sensitizers will no longer be destroyed when taken.

[0024]

Embodiments Next, embodiments of the method and apparatus for producing a color reflection hologram of the present invention will be described with reference to the drawings. In the present invention, a duplication system is constructed by connecting a desired number of one-color duplication processes in series as shown in FIG. 5. That is, as shown in FIG. 1, a photosensitive material film 20 for duplication made of, for example, a silver salt photosensitive film is sent out from a film unwinding device 21, and the same film 20 is sequentially passed through a red duplication process R and a green duplication process. Process G,
After passing through the duplication process B for blue continuously, the winding device 33
The exposed film 20 is wound up. During each replication pass, red, green, and blue swelling and exposure occur, respectively. The film unwinding device 21 is rotated by a drive motor 22, and the traveling speed of the film 20 is adjusted by controlling its rotational speed.

Each duplication process includes, as shown in the figure, a swelling liquid application device 23 (hereinafter, R, G, and B representing the process are added after the number to distinguish the processes), a swelling liquid squeezing device, device 24, swelling liquid drying heater 25, thickness sensor 26, nip roller 27, index matching liquid dropping device 2
8. An original plate pasting drum 29 is provided, and a post-exposure drying heater 30 is provided downstream of the drum 29. In the illustrated embodiment, the swelling liquid application device 23 is provided with two rows of nozzles 35 in a direction intersecting the direction in which the film 20 travels, and sprinkles the swelling liquid on the upper surface of the film 20 in the form of a spray. , as shown in Figure 3,
A plurality of application rollers 36 are in contact with only the upper surface of the film 20.
It may be configured by arranging. In the illustrated case, the swelling liquid squeezing device 24 uses a blade to squeeze the coating liquid, but it may be of a type that squeezes the coating liquid using a roller. Furthermore, although the heaters 25 and 30 are, for example, electric heaters, they may be of any type as long as the temperature can be controlled. A roller 31 is arranged at an appropriate position between each process and to change the direction of the film 20.
A tension applying device 32 is arranged in front of each nip roller 27 to maintain a constant tension. Further, the light emitted from one common laser light source 37 is split by a half mirror 42 and irradiated onto each of the original plate pasting drums 29R, 29G, and 29B by spreading the cross-sectional linear shape through the film 20. It has become. In the figure, reference numeral 38 represents a shutter, 39 represents a wedge-shaped ND filter, and 43 represents a direction changing mirror.
The wedge-shaped ND filter 39 is used for off control, and the wedge-shaped ND filter 39 is used for exposure control. Note that, in FIG. 1, a cylindrical lens that spreads the laser beam in a cross-sectional line shape is not shown.

Further, the drive motor 22 is variable in speed, the wedge-shaped ND filter 32 is variable in position, and the amount of laser light transmitted can be adjusted. -B are configured to be able to adjust the temperature, and furthermore, the index matching liquid dropping devices 28R to 28B are configured to be able to adjust the dropping amount. These drive motor 22, wedge-shaped ND filter 39, and swelling liquid drying heater 25R~
B, post-exposure drying heaters 30R-B, and index matching liquid dropping devices 28R-B, as shown in FIG.
Their outputs are controlled by the CPU 40, and the CPU 40 also includes each thickness sensor 26R.
The data of the thickness of the film 20 after drying of the swelling liquid in each duplication process measured by ~B is input. Note that the CPU 40 is attached with a ROM 41, and the wedge-shaped ND filter 39, the swelling liquid drying heaters 25R-B, and the post-exposure drying heaters 30R-B correspond to the speed of the drive motor 22 or the feeding speed of the film 20. ,
Control amounts of the index matching liquid dropping devices 28R to 28B are stored.

Using such a duplication system, red (610 nm), green (540 nm),
To multiplex record Lippmann holograms for three colors of blue (470 nm), for example, the silver salt recording material ILFORD red roll film (SP673T) 20 is sent out from the film unwinding device 21 by controlling the rotation of the drive motor 22. . The sent-out photosensitive material film 20 first enters the red duplication process R, where the pre-swelling treatment of the film SP673T is removed by an aqueous solution with a D-sorbitol concentration of 0% in the swelling liquid application device 23R, and the red duplication process R is performed. It becomes swollen. This swelling method uses two rows of nozzles 35.
The photosensitive material side of the film 20 is turned upward and the film 20 is passed through the chamber where the swelling liquid is continuously sprayed for about 10 minutes.
Swelling is completed by passing for a second.

What is important to note here is that if such a swelling liquid coating method or the coating method shown in FIG. This means that you won't have to get it wet. When the base surface of the film 20 is wetted, the base film made of PET resin or the like becomes adhesive, and after exposure, the base film is removed by the winding device 33.
When the photosensitive material is rolled up, the base surface and the photosensitive material surface come into contact and the exposed photosensitive surface is destroyed due to the adhesiveness of the base surface. However, if the coating method described above is adopted, such inconveniences are eliminated.

Note that if the film 20 is not pre-swelled, the red swelling liquid coating device 23R, swelling liquid squeezing device 24R, swelling liquid drying heater 25R, and thickness sensor 26R are not necessarily necessary.

Next, the excess swelling liquid applied is squeezed from the film surface by the swelling liquid squeezing device 24R, and the moisture in the swelling liquid that has penetrated into the photosensitive material is dried with hot air by the swelling liquid drying heater 25R. The thickness of the dried photosensitive material is measured by a thickness sensor 26R. This measurement data is taken into the computer 40, and it is determined whether the desired swelling state is achieved.

[0031] Here, the swelling liquid of a predetermined concentration is applied to the film 2.
0, if the coating time is long enough, it will saturate to a certain swelling state (swelling degree) determined by the concentration of the swelling liquid, but if you try to replicate in a stable state by shortening the replication time as much as possible For this purpose, it is sufficient to confirm that the thickness of the photosensitive material is approximately at its saturated value. Therefore, if the measurement data from the thickness sensor 26R does not exceed this value, the computer 40 applies feedback to the drive motor 20 to reduce the feeding speed of the film 20, and increases the time for spraying the swelling liquid to prevent swelling. Make sure that the thickness of the photosensitive material exceeds this value.

[0032] In this state, the shutter 38 of the He-Ne laser 37 is opened to perform red exposure (however,
As described later, if the thickness conditions are also satisfied for green and blue). At this time, since the appropriate amount of exposure depends on the feed speed of the film 20, the computer 40 controls the position (transmittance) of the wedge-shaped ND filter 39 in accordance with the rotation speed of the drive motor 20 (if the speed is slow, , the exposure must be lowered). Furthermore, if the feeding speed of the film 20 is fast, the temperature of the swelling liquid drying heater 25R must be increased to accelerate drying, so the computer 40 similarly controls the temperature of the swelling liquid drying heater 25R. Furthermore, as in the case of FIG. 5, the exposure is performed via the index matching liquid dripped from the dripping device 28R, so the amount of this dripping must also be adjusted according to the feeding speed of the film 20. Therefore,
The index matching liquid dropping device 28R is also controlled by the computer 40. Further, the temperature of the post-exposure drying heater 30R, which dries the index matching liquid after exposure, must also be controlled in the same way as the swelling liquid drying heater 25R. Therefore, the temperature of the post-exposure drying heater 30R is also controlled by the computer 40.

After the red exposure, the green duplication step G
Similarly, the swelling liquid application device 23G (in this case,
The D-sorbitol concentration of the swelling solution was adjusted to 10%. ), swelling liquid squeezing device 24G, swelling liquid drying heater 2
5G and a thickness sensor 26G, and is exposed to laser light of the same wavelength as the red exposure at a different reproduction light irradiation angle. At this time, if the thickness of the swollen photosensitive material measured by the thickness sensor 26G is not equal to or greater than the desired value, the computer 40 applies feedback to the drive motor 20 to further reduce the feeding speed of the film 20, and uses the green swelling liquid. The spraying time is increased so that the thickness of the swollen photosensitive material becomes a desired value or more. Therefore, if the downstream swelling state is insufficient, even if the upstream swelling state is sufficient, the feeding speed of the film 20 is reduced until the downstream swelling state reaches a predetermined value. This is due to the property that once the swelling reaches a predetermined value, it hardly swells any more even if it takes longer to swell. And since the overall film feed speed will also be this reduced speed, based on that speed,
Wedge-shaped ND filter 39, swelling liquid drying heater 2
5R, G, index matching liquid dropping device 28R,
G controls the post-exposure drying heater 30R and G.

Heater 30G for post-exposure drying after exposure for green
The index matching liquid is dried and enters the blue duplication process B, in which the swelling liquid application device 23B (in this case, the D-sorbitol concentration of the swelling liquid is adjusted to 17%) and the swelling liquid squeezing The laser beam passes through the device 24B, the swelling liquid drying heater 25B, and the thickness sensor 26B, and is exposed to laser beams of the same wavelength as those for red and green exposure at different reproduction light irradiation angles. At this time, if the thickness of the photosensitive material in the swollen state measured by the thickness sensor 26B is not equal to or greater than the desired value, the computer 40 applies feedback to the drive motor 20 to further reduce the feeding speed of the film 20, and swells the photosensitive material for blue. The liquid is sprayed for a long time so that the thickness of the swollen photosensitive material exceeds a desired value. Since the overall film feeding speed also becomes this reduced speed, based on that speed, the wedge-shaped ND filter 39, swelling liquid drying heaters 25R-B, index matching liquid dropping devices 28R-B, post-exposure drying Heater 30R~
B is controlled.

Therefore, the film feeding speed is controlled to the maximum speed at which the data measured by the three thickness sensors 26R, G, and B are all greater than or equal to the desired value corresponding to each color, and The wedge-shaped ND filter 39 and the index matching liquid dropping devices 28R to 28B are controlled so that a constant concentration and a constant dropping amount are obtained per unit length of the film 20. Drying heater 25R~B
, the temperatures of the post-exposure drying heaters 30R-B are controlled.

After such multiple exposure, the film 20 is wound up by a winding device 33, for example, an ILFOR
By using Company D's HOTEC developer and bleaching solution and releasing the swelling state at the same time as the development process, a reflective hologram with natural colors of red, green, and blue can be obtained.

Although the color reflection hologram duplication method and apparatus of the present invention have been described above based on the embodiments, the present invention is not limited to these embodiments and can be modified in various ways. For example, the number of colors to be exposed may be two, four or more.

[0038]

Effects of the Invention According to the method and apparatus for manufacturing a color reflection hologram of the present invention as described above, in a system for manufacturing a color reflection hologram by arranging multiple sets of swelling and exposure steps in series, it is possible to In addition, the feeding speed of the photosensitive material film for duplication is controlled so that the swelling degree is approximately the same as the value determined by the swelling liquid used in the process. It does not change due to humidity or the like, has good color reproducibility, and can stably and efficiently produce large quantities of color reflective holograms.

By applying the swelling liquid to the silver halide photographic film in each step only on the sensitive side, the base surface of the photosensitive material film for duplication will be wetted with the swelling liquid and the film will not be wound. Sensitizers will no longer be destroyed when taken.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the configuration of an apparatus for carrying out the method for producing a color reflection hologram of the present invention.

FIG. 2 is a system configuration diagram for controlling the device in FIG. 1;

FIG. 3 is a diagram for explaining another example of a swelling liquid application device.

FIG. 4 is a diagram for explaining a reflection hologram duplication method based on the premise of the present invention.

FIG. 5: 1 of the reflection hologram duplication method based on the premise of the present invention
It is a figure which shows an example.

FIG. 6 is a diagram for explaining swelling treatment and changes in reproduction wavelength.

[Explanation of symbols]

Claims (9)

[Claims] Claim 1: A reflection hologram is pasted on a drum as an original, and a photosensitive material film for duplication made of a silver salt photographic film in which a swelling liquid is applied to the drum surface to swell a photosensitive material is wrapped around the drum and brought into close contact with the original. Then, the rotational speed of the drum is matched with the feeding speed of the photosensitive material film for duplication, and the laser light is irradiated onto the original plate from the photosensitive material film for duplication to continuously record the information of the reflection hologram on the photosensitive material film for duplication. Multiple sets of processes are connected in series, and in each process, different original plates are pasted onto the original plate pasting drum to change the degree of swelling, and when the reproduced product is reproduced, the reproduction wavelength of each pattern reproduced from each original plate is changed. In the method for manufacturing a color reflection hologram in which a multicolor reflection hologram is produced, the photosensitive material film for duplication is fed in such a way that the degree of swelling is approximately equal to the value determined by the swelling liquid used in each step. A method for producing a color reflection hologram characterized by controlling speed. 2. The method for producing a color reflection hologram according to claim 1, wherein the swelling liquid is applied to the silver salt photographic film only on the sensitive side in each step. 3. In each step, after applying the swelling liquid, the swelling liquid that has permeated the coating is dried, and before the original plate and the photosensitive material film for duplication are brought into close contact with each other, an index matching liquid is dropped between the two, and the index matching liquid is dropped between them. 3. The method for producing a color reflection hologram according to claim 1, wherein the close contact is performed through a matching liquid, and the index matching liquid is dried after exposure. 4. The method according to claim 3, wherein the drying temperature of the swelling liquid, the dripping amount of the index matching liquid, and the drying temperature of the index matching liquid are changed in accordance with the feeding speed of the photosensitive material film for duplication. A method for producing color reflection holograms. 5. Claim 1, characterized in that the degree of swelling is increased in order from upstream to downstream processes, and in the most upstream process, application of the swelling liquid and drying of the swelling liquid are not performed. 4. The method for producing a color reflection hologram according to any one of 4. 6. The method for producing a color reflection hologram according to claim 1, wherein the degree of swelling in each step is measured by measuring the thickness of the sensitizer. 7. In each step, three different reflective hologram originals that have the same wavelength but are reproduced at different reproduction light irradiation angles are prepared as originals to be pasted on the original pasting drum, and one photosensitive material film for duplication is prepared. 7. The method for producing a color reflection hologram according to claim 1, wherein the information of each reflection hologram master is superimposed and duplicated. 8. An apparatus for carrying out the method for producing a color reflection hologram according to claim 1, which is provided with a feeding means and a winding means for a photosensitive material film for duplication, and at least a swelling liquid application means and a swelling liquid coating means in each step. A squeezing means, a swelling liquid drying means, a sensitizer thickness measuring means, an index matching liquid dropping means, and an index matching liquid drying means are provided, and based on the thickness data obtained from the sensitizer thickness measuring means in each step, the photosensitive material film for duplication is prepared. In addition to controlling the sending speed of the sending means, means for drying the swelling liquid in each step,
A color reflection hologram manufacturing apparatus characterized in that outputs of an index matching liquid dropping means and an index matching liquid drying means are controlled. 9. The apparatus for producing a color reflection hologram according to claim 8, wherein the swelling liquid applying means in each step applies the swelling liquid only to one side of the photosensitive material film for duplication.