JP2003280501A - Method for producing stereoscopic image print - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily producing a stereoscopic image print by which a full-color stereoscopic image with excellent preservation stability and high image quality without a sence of incongruity is reproduced. <P>SOLUTION: Blue, green and red photosensitive layers 38, 40 and 42 (RGB layers), and a layer 44 to be removed are laminated on a sliver salt film 10 in this sequence from the side of a support body. When the RGB layers are exposed to a laser beam with a prescribed wave length modulated in response to amplitude information, a light transmission factor after development is changed, and RGB color filters are respectively formed to be filter layers. The layer 44 to be removed is ablated by an UV laser beam modulated in pulse width in response to phase information, and changed in thickness, so as to be a phase modulation layer. <P>COPYRIGHT: (C)2004,JPO

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 stereoscopic image print for producing a stereoscopic image print for reproducing a stereoscopic image.

[0002]

2. Description of the Related Art Holography is a technique for recording and reproducing information on the amplitude and phase of a light wave for reproducing a stereoscopic image on a medium. When irradiating an object with coherent light such as laser light and irradiating the recording medium with reflected light (object light) from the object, another
When the recording medium is irradiated with the coherent light (reference light) of the book at the same time, interference fringes are formed on the recording medium. A hologram is obtained by recording the light intensity distribution due to this interference in the medium as a change in the refractive index or the absorptance. When the recording medium on which the hologram is recorded is irradiated with only the reference light, the hologram acts as a diffraction grating and the object light is reproduced. When an object having a three-dimensional structure is used as the subject, the reproduced image becomes a stereoscopic image with a natural stereoscopic effect. Therefore, holography is widely used as a method for displaying a stereoscopic still image.

However, the holography has a problem that the photographing process is complicated, and a general person cannot easily obtain a desired three-dimensional image. For this reason, there has been a need for a mechanism for providing personally captured images and personally created images as stereoscopic images. In addition, holography has a problem that it is difficult to obtain a full-color image with high image quality and no discomfort.

An image reproduced by ordinary holography is a single color, but a color image can be recorded and reproduced as described in, for example, Junpei Tsujiuchi, "Holography" Shokabo (1997). Various holograms have been studied.

The first color hologram was proposed by Le
ith etc. In the method of Leith et al., A color image is obtained by using three holograms photographed for each color of RGB. First, an object is illuminated with laser light of three colors of RGB, and three holograms are photographed for each color of laser light. Next, when each of the three holograms is illuminated by using the laser light of the same color as that used for photographing, reproduced images of three colors of RGB appear at the same position and a color image is reproduced.

However, there is a drawback that a so-called ghost image appears because the laser light of each color is diffracted by each of the three holograms during reproduction. In addition, a Foucault grating is placed in the reference optical system at the time of shooting to record three holograms so that they do not overlap each other, so that a reproduced image without a ghost image can be obtained. The same optical system is required, which is complicated.

A rainbow hologram or a Lippmann hologram can also record and reproduce a color image. The rainbow hologram is taken so that the spatial carrier of the hologram is in the horizontal direction.
By photographing three rainbow holograms at the respective wavelengths of RGB, and adhering them together and illuminating with white light, reproduced images from the three holograms appear at the same position, and a color image is reproduced. . However, the rainbow hologram has a defect that the position where an image with correct color balance can be seen is determined, and if the eyes are moved from that position, the color reproduction becomes poor.

The Lippmann hologram is a color hologram in which interference fringes are written in each of the photosensitive layers provided corresponding to the three RGB colors of a thick photosensitive material such as a silver halide photosensitive material. Reproduced images from the respective photosensitive layers appear at the same position in an overlapping manner to reproduce a color image. However, there is a drawback that an image different from that at the time of photographing is reproduced at the time of reproduction because the photosensitive layer contracts at the time of development.

Although a color hologram can be produced by using a stereogram, the stereogram is used to write an intensity image viewed from various angles by using a plurality of two-dimensional photographic images, and to control the phase of light. I haven't done so far.

Unlike holograms normally taken, computer generated holograms are called computer generated holograms (CGH). This is a hologram created by calculating the structure of the hologram itself (distribution of amplitude and phase of object light) using a computer. A hologram composed of many ordinary photographs is called a holographic stereogram.

Recently, a small device called a hologram printer for synthesizing a holographic stereogram from image data stored in a computer has been developed (M. Yamaguchi, N. Ohyama, T. Honda, "Hologra.
phic three-dimensional printer: new method, "Applie
d Optics 31, pp.217-222 (1992), Nobuhiro Kihara, Akira Shirakura, Shigeyuki Baba, "High-speed hologram portrait printing system," 3D Image Conference '98, pp.257-262 (1998)).
However, this hologram printer has a drawback that a complicated optical system is required for exposure using light interference, and high accuracy is required during writing.

Further, a stereoscopic image can be displayed from the image data stored in the computer by using a two-dimensional spatial light modulator. For example, a liquid crystal spatial modulator is used to control the amplitude and phase of transmitted light by changing the absorptance and the refractive index for each fine cell, thereby reproducing a stereoscopic image. According to this method, a phase conjugate image does not appear and R, which is the three primary colors of light, is compared with the case where a reproduced image is obtained by diffraction by interference fringes.
By spatially separating GB, a ghost image due to another wavelength can be prevented. Further, there is an advantage that a high diffraction efficiency can be obtained (a bright image can be reproduced).
However, with the current technology, it is difficult to display a stereoscopic image that can be appreciated because the liquid crystal pixel of the spatial modulator is as large as about 100 μm and it is difficult to increase the area. In addition, the high cost is also a drawback for enjoying still images.

It is known that the density of a photographic film changes depending on the amount of exposure, and that relief formation and a change in refractive index occur due to expansion and contraction. A method of recording the amplitude distribution and phase distribution of object light calculated by a computer on a photographic film by utilizing this is called kinoform. For example, a reversal color film is used to record the amplitude distribution on the red photosensitive layer and the phase distribution on the blue photosensitive layer and the green photosensitive layer. By reproducing the recorded reversal color film with a red laser (HeNe laser), a character image with parallax can be reproduced (DC
Chu, JRFienup, JWGoodman, "Multiemulsion on-ax
is computer generated hologram, "Applied Optics 1
2, pp.1386-1388 (1973)). However, even if a reversal color film is used, the obtained image is a monochrome image.

As described above, in the conventional holographic method, it is not possible to easily obtain a desired three-dimensional image (stereoscopic image print), and it is possible to obtain a full-color stereoscopic image with high image quality and no discomfort. There wasn't. Further, the recording method utilizing chemical changes such as photosensitive recording has a problem that deterioration with time occurs due to the same effect as so-called fading.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily produce a stereoscopic image print which reproduces a full-color stereoscopic image having excellent storage stability, high image quality, and no discomfort. It is an object of the present invention to provide a method for producing a three-dimensional image print that can be performed.

[0016]

(First Manufacturing Method) In order to achieve the above object, the first method for manufacturing a three-dimensional image print according to the present invention is provided with an object to be removed which is provided for recording phase information. A layer and a stereoscopic image recording film having a plurality of photosensitive layers for amplitude recording provided corresponding to each color for recording the amplitude information for each color, phase information for reproducing a stereoscopic image and for each color. A method for manufacturing a stereoscopic image print, in which phase information and amplitude information of image data represented by dividing the amplitude information into small areas are recorded, and a method for manufacturing a stereoscopic image print, comprising a plurality of photosensitive members for amplitude recording. Each of the layers is exposed with light modulated for each color according to the amplitude information for each small area of the image data and then developed, and the transmittance of each small area is changed according to the exposure amount to obtain the amplitude information. By recording, the color filter for each color A plurality of layers are formed to form a filter layer, and each of the corresponding sub-regions corresponding to each of the sub-regions of the layer to be removed is moved to a predetermined depth from the surface according to the phase information of each sub-region of the image data. Removed, the optical path length of each small region is changed according to the removal amount to form a phase modulation layer,
It is characterized by manufacturing a stereoscopic image print.

The obtained three-dimensional image print corresponds to each of the phase modulation layer in which the optical path length of each small area is changed based on the phase information of each small area of the image data and each of the small areas of the phase modulation layer. Each of the corresponding small areas comprises a color filter for each color formed so that the transmittance changes based on the amplitude information for each small area of the image data, and a filter in which a plurality of color filters for each color are stacked. And a layer.

In this three-dimensional image print, the phase of the transmitted light is modulated by the phase modulation layer, the amplitude of the transmitted light is modulated by the filter layer, and the wavelength band of the transmitted light is selected. Upon incidence, the phase, amplitude, and wavelength of the transmitted light are controlled for each small area, and the recorded stereoscopic image (hologram) is reproduced. As you can see, each information is recorded in dots instead of interference fringes.
The recording optical system and the reproducing optical system are simplified, and ghosts are prevented from occurring. This makes it possible to easily reproduce a color stereoscopic image having high image quality and no discomfort. In particular, when each of the above colors is red, green, and blue,
It is possible to reproduce full-color stereoscopic images with high image quality and no discomfort.

According to the first manufacturing method described above, each of the photosensitive layers for amplitude recording is exposed and developed, and the transmittance of each small region is changed according to the exposure amount to form the filter layer.
It is not necessary to attach a filter separately, the manufacturing process is simplified, and color shift is less likely to occur. Further, since the layer to be removed is removed to a predetermined depth from the surface and the optical path length of each small region is changed according to the removal amount to form the phase modulation layer, there is less deterioration with time as compared with recording due to chemical change. There are advantages. This makes it possible to easily manufacture a three-dimensional image print that reproduces a full-color three-dimensional image that has excellent storage stability, high image quality, and no discomfort.

(Second Manufacturing Method) In order to achieve the above object, the second method for manufacturing a three-dimensional image print of the present invention comprises:
A layer to be removed provided for recording phase information, a photosensitive layer for amplitude recording provided for recording amplitude information, and a color separation filter layer in which a large number of small area filters for each color are arranged. , The phase information and amplitude information of the image data represented by dividing the phase information and the amplitude information for each color for reproducing the stereoscopic image into small areas are recorded on the stereoscopic image recording film provided with A method for producing a three-dimensional image print, wherein each of the corresponding small areas corresponding to each of the small areas of the amplitude recording photosensitive layer, each color according to the amplitude information for each small area of the image data. Each of the small regions is exposed to light and then developed, and the transmittance of each small region is changed according to the exposure amount to record amplitude information, thereby forming an amplitude modulation layer, and the small layer of the removed layer is formed. Correspondence corresponding to each area Each area is removed to a predetermined depth from the surface according to the phase information for each small area of the image data, the optical path length of each small area is changed according to the removal amount to form a phase modulation layer, and a stereoscopic image is formed. It is characterized by producing a print.

The obtained three-dimensional image print corresponds to each of the phase modulation layer in which the optical path length of each small area is changed based on the phase information of each small area of the image data and each of the small areas of the phase modulation layer. Each of the corresponding small areas has an amplitude modulation layer formed so that the transmittance changes based on the amplitude information for each small area of the image data, and a large number of small area filters for each color correspond to the small areas. The color separation filter layers arranged individually are laminated.

In this three-dimensional image print, the phase of the transmitted light is modulated by the phase modulation layer, the amplitude of the transmitted light is modulated by the amplitude modulation layer, and the transmission wavelength is selected by each small area filter of the color separation filter layer. , When light is incident on a three-dimensional image print, the phase, amplitude, and
And the wavelength is controlled, and the recorded stereoscopic image is reproduced. As described above, since each piece of information is recorded in the form of dots instead of interference fringes, the recording optical system and the reproducing optical system are simplified and ghosts are prevented from occurring. This makes it possible to easily reproduce a color stereoscopic image having high image quality and no discomfort.

According to the second manufacturing method described above, a color separation filter layer is separately provided, each of the photosensitive layers for amplitude recording is exposed and developed, and the transmittance of each small area is changed according to the exposure amount. Since the amplitude modulation layer is formed by using the same, the amplitude modulation layer can be a single layer regardless of the number of colors, and the manufacturing process is simplified. Further, since the layer to be removed is removed to a predetermined depth from the surface and the optical path length of each small region is changed according to the removal amount to form the phase modulation layer, there is less deterioration with time as compared with recording due to chemical change. There are advantages. This makes it possible to easily manufacture a three-dimensional image print that reproduces a full-color three-dimensional image that has excellent storage stability, high image quality, and no discomfort.

(Third Manufacturing Method) In order to achieve the above object, a third method for manufacturing a three-dimensional image print according to the present invention comprises:
On a stereoscopic image recording film provided with a layer to be removed or a surface to be removed provided for recording phase information, phase information and amplitude information for each color for reproducing a stereoscopic image are shown divided into small areas. A method for producing a stereoscopic image print, in which phase information and amplitude information of image data are recorded to produce a stereoscopic image print, wherein each of the small regions of the layer to be removed or the surface to be removed is a small area of the image data. According to the phase information for each area to remove from the surface to a predetermined depth, the optical path length of each small area is changed according to the removal amount to form a phase modulation layer,
Applying a material containing ink of a different absorption wavelength for each color to each corresponding small area corresponding to each small area of the phase modulation layer according to the amplitude information for each small area of the image data. By changing the transmittance of each of the corresponding small areas according to the ink amount, an ink layer in which a large number of color filters for each color are arranged in a plane is formed to produce a three-dimensional image print. And

The obtained three-dimensional image print includes a phase modulation layer in which the optical path length of each small region is changed based on the phase information of each small region of the image data, and ink of a color having a different absorption wavelength for each color. Each of the corresponding sub-regions composed of the contained material and corresponding to each of the sub-regions of the phase modulation layer is formed so that the transmittance changes based on the amplitude information for each sub-region of the image data. The color filter is composed of a plurality of color filters, and a plurality of color filters for each color are stacked in a plane.

In this three-dimensional image print, the phase of the transmitted light is modulated by the phase modulation layer, the amplitude of the transmitted light is modulated by the ink layer, and the wavelength band of the transmitted light is selected. Upon incidence, the phase, amplitude, and wavelength of the transmitted light are controlled for each small area, and the recorded stereoscopic image is reproduced. As described above, since each piece of information is recorded in the form of dots instead of interference fringes, the recording optical system and the reproducing optical system are simplified and ghosts are prevented from occurring. This makes it possible to easily reproduce a color stereoscopic image having high image quality and no discomfort.

According to the third manufacturing method described above, the layer to be removed or the surface to be removed is removed from the surface to a predetermined depth, and the optical path length of each small region is changed according to the removal amount to form the phase modulation layer. Therefore, there is an advantage that deterioration with time is less than that of recording by chemical change. In addition, since a material containing ink is applied on the phase modulation layer and the ink layer is formed by changing the transmittance of each small region according to the amount of ink, there is no need to separately attach a filter, and the manufacturing process Is simplified and color shift is less likely to occur. In addition, the method of forming an ink layer by applying a material containing ink has versatility. This makes it possible to easily manufacture a three-dimensional image print that reproduces a full-color three-dimensional image that has excellent storage stability, high image quality, and no discomfort.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 shows the system configuration of a stereoscopic image printer according to the present embodiment. This three-dimensional image printer is provided with a storage unit 12 that stores the silver salt film 10 wound in a roll shape. Also, the storage unit 12
A plurality of transport rollers 14 for transporting the silver salt film 10 supplied from are disposed along the transport path. The plurality of transport rollers 14 are driven by a transport drive unit (not shown).

On the downstream side of the storage section 12 in the conveying direction, an exposing section 15 for scanning and exposing the silver salt film 10 with a laser beam according to image data, and a film after development of the exposed silver salt film 10 are developed. A development processing section 16 for fixing and bleaching, a dryer 18 for drying the film processed by the development processing section 16, and a cutter 20 for cutting the film into image forming areas are arranged in this order.

The exposure unit 15 has four color laser light sources of a red laser light source 22R, a green laser light source 22G, a blue laser light source 22B, and an ultraviolet laser light source 22UV, and a polygon mirror 24 that reflects the laser light emitted from these laser light sources. , And an fθ lens 26 for correcting the laser light reflected by the polygon mirror 24 so as to converge on the surface of the silver salt film 10.

As the laser light sources 22R, 22G, and 22B, solid-state lasers, fiber lasers, wavelength-converting solid-state lasers, gas lasers, surface-emitting lasers, etc. can be used in addition to semiconductor lasers. From the viewpoint of reduction, it is preferable to use a semiconductor laser or a solid-state laser. As the laser light source 22UV used for laser ablation, it is preferable to use an excimer laser of ultraviolet light having a narrow pulse width and high peak power.

In laser ablation, a solid substance is irradiated with pulsed laser light to evaporate and irradiate the irradiated portion within a short time.
It is a process of scattering and removing, and is also called pulse laser ablation. By using laser ablation, it is possible to write a dot having a smaller size than that in the case of mechanical removal or chemical melting, and the writing position accuracy is improved. For this laser ablation, it is possible to use an ultrashort pulse laser such as a short wavelength laser or a femtosecond pulse laser because it is possible to perform precision microfabrication on a polymer material that is weak against heat and suppresses the influence of heat. More preferable.

For example, the red laser light source 22R has 600
A semiconductor laser that emits light in a wavelength range of 700 nm to 700 nm, a semiconductor laser-excited wavelength-converted solid-state laser that emits light in a wavelength range of 500 to 600 nm is used for the green laser light source 22G, and 450 to 500 n is used for a blue laser light source 22B.
A wavelength-converted solid-state laser excited by a semiconductor laser that emits light in the wavelength range of m
An excimer laser that emits light in the wavelength range of 450 nm can be used.

Each of the four color laser light sources is modulated by a modulation driving device (not shown) controlled by the computer 28. The modulation method may be intensity modulation, pulse width modulation, or pulse train modulation. As the modulation driving device, for example, an external modulator such as an electro-optic modulator (EOM) is arranged, and the external modulator can be driven to modulate the laser light from the laser light source. When a semiconductor laser is used, the semiconductor laser may be directly driven for modulation without using an external modulator. The computer 28 includes a memory, a CPU, a ROM, a RAM and the like.

In the development processing section 16, a developing tank 30 for storing a developing solution, a fixing tank 32 for storing a fixing solution, and a bleaching tank 34 for storing a bleaching solution are arranged in this order toward the downstream side in the transport direction. ing.

Next, the layer structure of the silver salt film 10 used in the above three-dimensional image printer will be described. As shown in FIG. 2, the silver salt film 10 is provided with a plurality of photosensitive layers containing a silver halide emulsion and a color coupler having different photosensitivities, similar to a so-called reversal color film. On the support 36, three photosensitive layers, a blue photosensitive layer 38 sensitive to blue light, a green photosensitive layer 40 sensitive to green light, and a red photosensitive layer 42 sensitive to red light, and an ultraviolet laser beam are used. The to-be-removed layer 44, which is scraped off by, is laminated in this order from the support body side. In addition, an intermediate layer 46 composed of a color filter or the like is inserted between the respective layers in order to enhance the individual photosensitivity of the respective photosensitive layers. The intermediate layer 46 may be omitted.

The three light-sensitive layers are each formed by coating a light-sensitive material containing a silver halide emulsion and a color coupler on a film-shaped support. The removed layer 44 is
Polyimide, polyethylene terephthalate (PET),
It is made of a polymer material such as polymethylmethacrylate (PMMA), and is formed by coating these materials on the photosensitive layer.

When the three photosensitive layers, the blue photosensitive layer 38, the green photosensitive layer 40, and the red photosensitive layer 42 (RGB layer), are exposed with laser light of a predetermined wavelength modulated according to amplitude information, they are developed. And the color filters having different light transmittances are formed in each of the RGB layers in each of the small areas described later. The to-be-removed layer 44 is laser-ablated by the ultraviolet laser light modulated according to the phase information, and its thickness changes in each small region.

Next, a method for producing a three-dimensional image print (three-dimensional photograph) from the silver salt film shown in FIG. 2 using the three-dimensional image printer shown in FIG. 1 will be described. The manufacturing process of a three-dimensional image print is roughly divided into an exposure process and a development process.

The stereoscopic image printer is controlled by the computer 28, and the silver salt film 10 is exposed according to the processing routine shown in FIG. First, in step 100,
Image data for stereoscopic photography prepared in advance is read from the memory of the computer 28.

The image data for stereoscopic photography is image data in which the phase information for reproducing the stereoscopic image and the amplitude information for each of the RGB colors are divided into small areas to be described later. Such image data includes, for example, image information including three-dimensional data designed by three-dimensional CAD, three-dimensional data reconstructed from a two-dimensional image by a computer into a three-dimensional image, and It is calculated by considering the position, the position of the reproduction illumination light source, the position of the viewpoint, the shape of the film, and the like.

Next, in step 102, considering that the optical path length changes according to the exposure amount of the RGB layers due to contraction accompanying the exposure, etc., the optical path length change by the RGB layers and the layer to be removed 44 are considered.
The exposure amount of the removed layer 44 by the ultraviolet laser light source 22UV is calculated so that the target phase modulation amount can be obtained by the change in the optical path length due to. That is, the thickness of the layer to be removed 44 that obtains a desired phase modulation amount is obtained, and the laser irradiation amount required to scrape the layer to be removed 44 to the thickness by laser ablation is calculated.

Next, in step 104, the silver salt film 1
0 conveyance is started. That is, the silver salt film 10 is pulled out from the storage section 12 so that the layer to be removed 44 side faces the exposure section 15, is transported at a predetermined speed, and is supplied to the exposure section 15.

Next, in step 106, the four color laser light sources are modulated and driven to expose the silver salt film 10. As shown in FIGS. 4A and 4B, the predetermined exposure region 48 of the silver salt film 10 is laser-ablated with ultraviolet laser light for each of the lattice-shaped small regions 50 and a laser of any one of RGB is used. It is exposed to light. For example, an R color region exposed with red light, a G color region exposed with green light, and a B color region exposed with blue light are repeatedly arranged in the order of RGB, and adjacent RGB 3 color regions are defined as one pixel. Full color exposure is possible. Note that FIG. 4A is a plan view of the silver salt film after development processing, and FIG. 4B is a cross-sectional view of the silver salt film at the time of exposure.

The laser light emitted from the red laser light source 22R is modulated by an optical modulator (not shown) driven by a modulation driving device (not shown) based on amplitude information of R color, and the modulated laser light is polygon mirror 24. It is focused on the surface. The laser light reflected by the polygon mirror 24 is corrected by the fθ lens 26, converges in a dot shape on the surface of the silver salt film 10 so as to be focused on the red photosensitive layer 42, and a small area corresponding to the R color is exposed. It

Similarly, the laser light emitted from the green laser light source 22G is modulated based on the amplitude information of the G color,
The green photosensitive layer 40 converges in a dot shape so as to form a focus, and a small area is exposed. Further, the laser light emitted from the blue laser light source 22B is modulated based on the amplitude information of the B color, converges in a dot shape so as to be focused on the blue photosensitive layer 42, and the small area corresponding to the G color is exposed. It

Further, the laser light emitted from the ultraviolet laser light source 22UV is pulse-width modulated based on the phase information and converges in a dot shape so as to be focused on the layer to be removed 44. As a result, a small area corresponding to the small area exposed by the laser light of any one of RGB is exposed.

The beam diameter of the laser beam on the surface of the silver salt film 10 is more preferably less than 20 μm in order to obtain high resolution.

Since the polygon mirror 24 is rotationally driven in the direction of arrow A at a predetermined angular velocity by a polygon driving unit (not shown), the surface of the silver salt film 10 is covered by the polygon mirror 2.
Main scanning is performed in the arrow B direction (film width direction) by the laser light reflected by 4. Further, the silver salt film 10 is conveyed in a predetermined direction by a plurality of conveying rollers 14 and is sub-scanned in a direction opposite to the conveying direction. In this way, the silver salt film 10 is scanned and exposed by the laser beam to record a latent image corresponding to the image data, and the surface is scraped off in small areas by laser ablation (removed to a predetermined depth from the surface). Unevenness is formed. The larger the exposure amount is, the larger the amount to be scraped off is, and the thickness of the layer to be removed 44 is reduced. The computer 28 controls the polygon drive unit, the transport drive unit, and the modulation drive device in synchronization with exposure.

Next, in step 108, it is determined whether or not the exposure according to the input image data has been completed. If the exposure is completed, the processing routine is terminated to stop the film transport, and if the exposure is not completed,
Returning to step 102, the next area is exposed.

In the development processing step, the silver salt film 1 after exposure is used.
In this step, the latent image recorded at 0 is visualized (developed) and then fixed and bleached. The silver salt film 10 supplied to the development processing unit 16 is conveyed by the conveyance rollers 14, immersed in the developing solution stored in the developing tank 30 to be developed, and then the fixing solution stored in the fixing tank 32. Is subjected to a fixing process, and then immersed in a bleaching solution stored in a bleaching tank 34 to undergo a bleaching process. The silver salt film 10 processed by the development processing unit 16 is dried by the dryer 18 and cut into each image forming area by the cutter 20.

By the development processing of the silver salt film 10, the exposed portion of the RGB layer, that is, each of the small areas, which is exposed with the exposure amount according to the image data, develops a color with the density according to the exposure intensity. A density (light transmittance) distribution is formed in each layer of. Looking at one small area in the stacking direction,
Since only one of the RGB layers develops color, each layer of the RGB layers becomes a color filter that selectively transmits light of a color (wavelength band) corresponding to each layer. As a result, the RGB layer becomes a filter layer in which color filters of RGB three colors that modulate the amplitude of transmitted light according to the wavelength band are stacked. In addition, the layer to be removed 44 has a thickness (relief depth) that changes depending on the exposure amount (pulse width) of the ultraviolet laser light due to ablation.
It becomes a phase modulation layer that modulates the phase of the transmitted light according to this change in thickness.

Therefore, the silver salt film 10 after development processing
When (stereoscopic image print) is irradiated with white light from the support 36 side, the filter layer (RGB layer after development: blue photosensitive layer 3)
8, the green photosensitive layer 40, and the red photosensitive layer 42) absorb the RGB light at different ratios for each small region to select the transmission wavelength and modulate the amplitude, and the removed layer 44 becomes the phase modulation layer. The phase is modulated by and the transmitted light is emitted. As a result, a full-color stereoscopic image is reproduced. That is, as shown in FIG. 9, the light is diffracted by the three-dimensional image print, the phase and amplitude of the transmitted light are modulated, and the wavefront of the object light of the three-dimensional object is reproduced. Therefore, a three-dimensional object image having a different shape is observed depending on the observation position.

As described above, in the present embodiment, the layer to be removed is irradiated with the ultraviolet laser light modulated according to the phase information, and the thickness of the layer to be removed is changed by laser ablation. The layer acts as a phase modulation layer that modulates the phase of the transmitted light in response to the change. In this way, since the layer to be removed is scraped from the surface and the phase information is recorded, there is less deterioration with time as compared with recording by a chemical change,
There is an advantage. Further, instead of writing interference fringes, the phase information is written in dots by the ultraviolet laser light, so that the optical system is simplified and the wavefront can be stably reproduced.

Further, in the present embodiment, since an inexpensive and highly sensitive silver salt film is used as the photosensitive material, image data can be written with a low output laser light source, and at the same time,
It is possible to create a stereoscopic image at low cost, and it can be used for personal use.

Further, in the present embodiment, since the image data is written on the silver salt film by using the laser light source, the computer generated hologram can be recorded by using the same method and device as those for the digital exposure on the printing paper. Further, it is possible to perform exposure with high resolution by narrowing the beam waist of the laser light.

Furthermore, in this embodiment, since the color filters for each of the RGB colors are formed in the RGB layer by laser exposure, there is no need to attach color separation filters as in the second embodiment described below. The manufacturing process of stereoscopic image print is simplified. Further, instead of writing interference fringes, amplitude information is written in dots for each color in each layer of the RGB layers, so that a color hologram without a ghost image is formed.

In this embodiment, a silver salt film in which three photosensitive layers, a blue photosensitive layer, a green photosensitive layer, and a red photosensitive layer are laminated in this order from the support side, is used. The order is not limited to this order. However, the layer to be removed needs to be the outermost layer.

(Second Embodiment) In the first embodiment, the filter layer is formed by laser exposure of the RGB layers, but in the second embodiment, color separation including color filters of RGB colors is performed. A silver salt film with a pre-formed filter layer is used. FIG. 5 shows the system configuration of the stereoscopic image printer according to this embodiment. It should be noted that only parts different from those of the stereoscopic image printer according to the first embodiment will be described, the same reference numerals will be given to the same components, and description thereof will be omitted.

The exposure section 15 is provided with two color laser light sources, a red laser light source 22R and an ultraviolet laser light source 22UV. Each of the two-color laser light sources is modulated by a modulation driving device (not shown) controlled by the computer 28.

As the laser light source 22R, a solid-state laser, a fiber laser, a wavelength conversion solid-state laser, a gas laser, a surface emitting laser, etc. can be used in addition to a semiconductor laser, but from the viewpoint of downsizing of the device and noise reduction, Preference is given to using semiconductor lasers or solid-state lasers. An ultraviolet excimer laser or the like is preferably used as the ultraviolet laser light source 22UV used for laser ablation. For example, the red laser light source 22R has 600 to 70
A semiconductor laser that emits light in the wavelength range of 0 nm can be used, and the ultraviolet laser light source 22UV has 350 to 450 n.
An excimer laser that emits light in the wavelength range of m can be used.

FIG. 6 shows the layer structure of the silver salt film 10A used in the above three-dimensional image printer. Silver salt film 1
0A is a red photosensitive layer 42A having a sensitivity to red light, a color separation filter layer 52, and a removed layer 44 on the support 36A.
A is laminated in this order. In addition, the intermediate layer 46A is inserted between each layer, but the intermediate layer 4A
6A can be omitted.

Among these layers, the red photosensitive layer 42A is exposed to a laser beam having a predetermined wavelength which is modulated according to the amplitude information to change the transmittance after development, and the layer to be removed 44A corresponds to the phase information. The thickness is changed by laser ablation with the pulse width modulated ultraviolet laser light.

As shown in FIG. 6, the color separation filter layer 52
Is composed of three color filters of RGB (R color filter, G color filter, and B color filter). Similar to the exposure area described with reference to FIG. 4, the color filters are arranged in a grid with RGB as a repeating unit so as to correspond to the divided small areas. The red photosensitive layer 42A is exposed to red laser light through the respective color filters. Note that the adjacent three color filters of RGB can be one pixel. In addition, the arrangement of the color filters of the three colors RGB is
Other arrangements are possible.

The red light-sensitive layer 42A is a film-shaped support 3 made of a light-sensitive material containing a silver halide emulsion and a color coupler.
It is formed by applying to the surface of 6A. The color separation filter layer 52 is formed by, for example, pasting a film-shaped color separation filter in which a large number of color filters of RGB colors are formed in advance on the red photosensitive layer 42A (via the intermediate layer 46). You can The layer 44 to be removed can be formed by applying a polymer material such as polyimide, PET, or PMMA on the color separation filter layer 52 (via the intermediate layer 46).

Next, a method for producing a three-dimensional image print from the silver salt film shown in FIG. 6 using the three-dimensional image printer shown in FIG. 5 will be described. The manufacturing process of this three-dimensional image print is performed by the red laser light source 22R and the ultraviolet laser light source 2
Except that the silver salt film 10A is exposed by the modulation driving of the two-color laser light of 2UV, the description of the same parts will be omitted and only the differences will be described.

Image data for stereoscopic photography is RG of 1 pixel.
For each color B, phase information and amplitude information for reproducing a stereoscopic image are divided into small areas.

As shown in FIG. 7, since the exposure area is preliminarily divided into color areas of RGB three colors by the color separation filter layer 52, the silver salt film 10A has the color separation filter layer 52.
Each small area corresponding to each color filter is exposed. That is, the amplitude information of the R color is recorded by the laser light through the R color filter, the amplitude information of the G color through the G color filter, and the amplitude information of the B color through the B color filter.

By the development processing, the red photosensitive layer 42A of the silver salt film 10 develops a color at a density according to the exposure intensity, and the light transmittance changes for each small area. According to the change in the light transmittance, the transmitted light is changed. It becomes an amplitude modulation layer that modulates the amplitude of. Also, the layer to be removed 44A becomes a phase modulation layer that is laser ablated to a predetermined thickness according to the exposure amount of the ultraviolet laser light to change its thickness, and modulates the phase of the transmitted light according to the thickness change.

Therefore, the silver salt film 10A after development processing
When white light is emitted from the side of the support 36A, the amplitude is modulated in each small area by the amplitude modulation layer (developed red photosensitive layer 42A), and then transmitted according to the color of the color filter of the color separation filter layer 52. The wavelength is selected, the phase is modulated for each small region by the phase modulation layer (the layer to be removed 44A after ablation), and the transmitted light is emitted. As a result, a full-color stereoscopic image is reproduced.

As described above, in the present embodiment, the layer to be removed is irradiated with the ultraviolet laser light modulated according to the phase information and the thickness of the layer to be removed is changed by laser ablation. Acts as a phase modulation layer that modulates the phase of transmitted light according to the change. in this way,
Since the layer to be removed is scraped from the surface and the phase information is recorded, there is an advantage that deterioration over time is less than that of recording due to a chemical change. Also, instead of writing interference fringes,
Since the phase information is written in dots by the ultraviolet laser light, the optical system is simplified and the wavefront can be reproduced stably.

In this embodiment, since an inexpensive and highly sensitive silver salt film is used as the light-sensitive material, image data can be written with a low-power laser light source and a stereoscopic image can be produced at low cost. Yes, it can be used for personal use.

In this embodiment, since image data is written on a silver salt film by using a laser light source, a computer generated hologram can be recorded by using the same method and device as those for digital exposure on photographic paper. Also, the beam of laser light
By narrowing the waist, exposure can be performed with high resolution.

In this embodiment, since the silver salt film on which the color separation filter layer is formed in advance is used, the amplitude information for the three colors RGB can be written with a single laser light source, and the exposure unit of the stereoscopic image printer can be written. Simplifies the configuration. Further, since amplitude information is written in dots on the red photosensitive layer instead of writing interference fringes, a color hologram without a ghost image is formed.

Another application example of the present invention will be described below.

In the above first and second embodiments, the example of removing the layer to be removed by laser ablation with the ultraviolet laser beam has been described, but the layer to be removed is shaved from the surface to change its thickness. However, the removal method is not limited to laser ablation with an ultraviolet laser beam. Other removal methods include, for example, laser ablation with a laser beam having another wavelength such as an infrared YAG laser, mechanical removal, photomelting, heat melting, and chemical melting by dropping a solvent or washing.

In the above first and second embodiments, an example in which a projection image is obtained by a laser projector or the like using a transmission type stereoscopic image print has been described. By sticking a metal thin film, it can be used as a reflection type three-dimensional image print. In addition to displaying a three-dimensional image, the stereoscopic image print can be used not only as an optical modulator in optical information communication but also as an optical phase wavefront distortion compensation film using only a phase modulation layer. .

Further, in the above-mentioned first and second embodiments, an example in which the film is scanned and exposed by the laser beam has been described, but for example, the laser beam whose beam diameter is expanded is changed to the liquid crystal,
Modulate using a spatial light modulator such as a micromirror array to simultaneously expose a predetermined area of the film (surface exposure)
You may. Further, a light emitting element array other than a laser such as an EL (electroluminescence) element array may be used. By performing the surface exposure, the exposure time is shortened and the exposure accuracy is improved.

Further, in the above-mentioned first and second embodiments, the example in which the amplitude information is recorded by the laser exposure has been described, but the amplitude information can also be recorded by applying an amount of ink according to the amplitude information. Can be recorded. The ink is a color material (dye or pigment) dissolved or dispersed in a solvent, and its application method includes, for example, a method of ejecting the ink from a head of an inkjet printer to form an ink layer. Amplitude information is also obtained when fixing a toner in which a pigment is dispersed in a resin binder by xerography, or when photocuring a photocurable resin in which a pigment is dispersed in a resin to form a cured resin layer. Amplitude information can be recorded by applying the pigment in an amount corresponding to.

A case of forming an ink layer using an ink jet printer will be described. As shown in FIG. 8, a plastic film 10B in which a layer to be removed 44B is laminated on a support 36B is used and an ultraviolet laser beam is used. The layer to be removed 44B of the plastic film 10B is shaved off from the surface in each small area by laser ablation to form unevenness, and the thickness changes according to the pulse width of the ultraviolet laser light to control the phase of transmitted light. It becomes a modulation layer.

After forming the unevenness, the inkjet head 5
Ink of any one color of CMY from 3 to 3 is applied on the above-mentioned phase modulation layer to form an ink layer 54 having a predetermined color distribution. At this time, by controlling the ink ejection amount and changing the ink amount applied for each small area, that is, the ink amount applied per unit area, the transmission wavelength is controlled according to the ink color and the ink amount is controlled according to the ink amount. A large number of small area filters that control the light transmittance are formed.

Therefore, when the plastic film 10B on which the ink layer 54 is formed is irradiated with white light from the side of the support 36B, the phase modulation layer (the layer to be removed 44B after ablation) causes the phase of transmitted light to be changed depending on the exposure amount. Are modulated, the RGB light is absorbed by the ink layer 54 in different proportions for each small region, the transmission wavelength is selected, the amplitude is modulated, and the transmission light is emitted. As a result, a full-color stereoscopic image is reproduced.

When the amount of ink increases, the light transmittance may decrease and the image may become dark. Therefore, it is possible to make only the phase modulation layer transparent and the ink layer reflective. Instead of providing the support 36B and the layer to be removed 44B separately, the surface of the plastic film support may be removed by ablation.

In the above first and second embodiments, the example in which the laser light is scanned by the polygon mirror has been described. However, as shown in FIG. 10, the exposure unit of the stereoscopic image printer is set to the red laser light source. 22R, green laser light source 22
G, blue laser light source 22B, and ultraviolet laser light source 22U
Set the four-color laser light source of V and the silver salt film 10 to the arrow C
Alternatively, the exposure head 58 may perform scanning exposure in any direction.
Each of the laser light sources 22R, 22G, 22B, and 22UV is coupled to the input end of a corresponding optical fiber 56R, 56G, 56B, and 56UV, and the optical fibers 56R, 5R, and 5UV are coupled.
Each of the 6G, 56B, and 56UV output ends is held by the exposure head 58. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this exposure unit, the laser light emitted from the red laser light source 22R is based on the amplitude information of the R color,
The laser light modulated and modulated by an optical modulator (not shown) driven by a modulation driving device (not shown) is coupled to the input end of the optical fiber 56R. Similarly, the laser light emitted from each of the laser light sources 22G, 22B, and 22UV is coupled to the input ends of the corresponding optical fibers 56G, 56B, and 56UV.

Since the exposure head 58 is reciprocally moved at a predetermined speed in the direction of arrow C by a head drive unit (not shown), the surface of the silver salt film 10 is covered with the optical fibers 56R, 56G, 56B held by the exposure head 58. And 56 UV
The main scanning is performed in the arrow C direction (film width direction) by the laser light emitted from the output end of the. Further, the silver salt film 10 is transported in a predetermined direction by the transport roller 14,
Sub scanning is performed in the direction opposite to the transport direction. In this way, the silver salt film 10 is scanned and exposed by the laser beam, and a latent image corresponding to the image data is recorded. The head drive unit is controlled by the computer 28 in synchronization with exposure.

In this exposure section, each laser light source and the exposure head are connected by an optical fiber, and the exposure head is driven to scan and expose the silver salt film. Therefore, the structure of the exposure section is simplified and the apparatus is miniaturized. Can be achieved. Further, it is possible to write a minute dot having a size of about 10 nm to the exposure wavelength by performing exposure with near-field light using a fiber probe for the exposure head.

Further, since the stereoscopic image printer described above can directly perform laser drawing on film, it can be used for purposes other than three-dimensional photographic production, such as transferring a high-definition digital image to a negative film or a positive film. Can be used. As a result, for example, it is possible to additionally write a specific character or character at a high resolution on the photographed positive film, or to write an animation character on a negative film and print it as a photograph.

[0089]

According to the present invention, there is provided a method for producing a three-dimensional image print, which can easily produce a three-dimensional image print having excellent storage stability, reproducing a high-quality and color-free three-dimensional image. To be done.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a system configuration of a stereoscopic image printer according to a first embodiment.

FIG. 2 is a cross-sectional view showing the layer structure of a silver salt film used in the first embodiment.

FIG. 3 is a flowchart showing a processing routine of an exposure process when the stereoscopic image printer shown in FIG. 1 is used.

FIG. 4 is a diagram for explaining an exposure method of a silver salt film in the first embodiment, (A) is a plan view of the silver salt film after development processing, and (B) is silver at the time of exposure. It is sectional drawing of a salt film.

FIG. 5 is a schematic diagram showing a system configuration of a stereoscopic image printer according to a second embodiment.

FIG. 6 is a cross-sectional view showing the layer structure of a silver salt film used in the second embodiment.

FIG. 7 is a diagram for explaining an exposure method for a silver salt film in the second embodiment.

FIG. 8 is a diagram for explaining a modified example in which a pigment-containing layer is provided on a silver salt film and amplitude information is recorded according to the pigment concentration.

FIG. 9 is a diagram showing how a three-dimensional object image is observed using the silver salt film after development processing.

FIG. 10 is a schematic diagram showing another configuration of the exposure unit of the stereoscopic image printer.

[Explanation of symbols]

10,10A, 10B Silver salt film 12 Storage 14 Conveyor rollers 15 Exposure section 16 Development processing section 18 dryer 20 cutters 22R red laser light source 22G green laser light source 22B blue laser light source 22UV UV laser light source 24 polygon mirror 26 fθ lens 28 Computer 30 developer tank 32 fixing tank 34 Bleaching tank 36, 36A, 36B support 38 Blue photosensitive layer 40 Green photosensitive layer 42,42A Red photosensitive layer 44,44A, 44B layer to be removed 46 Middle class 48 exposure area 50 areas 52 filter layer 54 ink layer 56 optical fiber 58 exposure head

Claims (3)

[Claims] 1. A layer to be removed provided for recording phase information, and a plurality of photosensitive layers for amplitude recording provided corresponding to each color for recording amplitude information for each color. A stereoscopic image recording film is manufactured by recording phase information and amplitude information of image data in which phase information for reproducing a stereoscopic image and amplitude information for each color are divided into small areas and recorded. A method of manufacturing an image print, wherein each of the plurality of photosensitive layers for amplitude recording is exposed with light modulated for each color according to amplitude information for each small area of the image data, and then developed, By recording the amplitude information by changing the transmittance of the small area according to the exposure amount, a filter layer in which a plurality of color filters for each color are laminated is formed, and corresponds to each of the small areas of the layer to be removed. Each corresponding small area According to the phase information of each small area of the image data, it is removed from the surface to a predetermined depth, the optical path length of each small area is changed according to the removal amount to form a phase modulation layer, and a three-dimensional image print is manufactured. Image print manufacturing method. 2. A removed layer provided for recording phase information, a photosensitive layer for recording amplitude provided for recording amplitude information, and a large number of small area filters for each color are arranged. On a stereoscopic image recording film provided with a color separation filter layer, the phase information and the amplitude information of the image data represented by dividing the phase information and the amplitude information for each color for reproducing the stereoscopic image into small areas are recorded. A method for producing a three-dimensional image print, in which each of the corresponding small areas corresponding to each of the small areas of the amplitude recording photosensitive layer is set to an amplitude for each small area of the image data. By exposing with light modulated for each color according to the information and then developing, by changing the transmittance of each small area according to the exposure amount and recording the amplitude information, an amplitude modulation layer is formed, Each of said small areas of the removal layer Each corresponding small area is removed from the surface to a predetermined depth according to the phase information of each small area of the image data, and the optical path length of each small area is changed according to the removal amount to form a phase modulation layer. Then, a method for producing a three-dimensional image print, which produces a three-dimensional image print. 3. A three-dimensional image recording film having a layer to be removed or a surface to be removed provided for recording phase information,
A stereoscopic image print manufacturing method for manufacturing a stereoscopic image print by recording phase information and amplitude information of image data represented by dividing the phase information and the amplitude information for each color for reproducing a stereoscopic image into small areas. There, each of the small areas of the layer to be removed or the surface to be removed is removed to a predetermined depth from the surface according to the phase information for each of the small areas of the image data, and the optical path length of each small area is set as the removal amount. The phase modulation layer is formed by changing the absorption wavelength for each color according to the amplitude information for each small area of the image data in each corresponding small area corresponding to each of the small areas of the phase modulation layer. By applying materials containing inks of different colors, the transmittance of each of the corresponding small areas is changed according to the ink amount, and an ink layer in which a large number of color filters of each color are arranged in a plane is formed. Form and pre-stereo image Manufacturing the door, the method of manufacturing a three-dimensional image print.