JP3914076B2 - Method for manufacturing stereoscopic image print and stereoscopic image printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a stereoscopic image print and a stereoscopic image printer which can easily obtain the stereoscopic image print reproducing a full-color stereoscopic image of high picture quality without no feeling of physical disorder. <P>SOLUTION: On a silver salt film 10 a blue photosensitive layer 38, a green photosensitive layer 40, and a red photosensitive layer 42 (RGB layer) are laminated in this order from the base side. The RGB layer is exposed to laser light of specified wavelength whose intensity is modulated according to amplitude information by small areas 50 to have color filters of R, G, and B formed by varying light transmissivity after development and become a filter layer. A transparent ink layer 44 is formed by applying transparent ink differing in ink concentration by the small areas 50 on the filter layer by using a writing head 53. The refractive index varies with the ink concentration and optical path length varies according to the refractive index variation, so the transparent ink layer 44 becomes a phase modulation layer modulating the phase of transmitted light. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a stereoscopic image print manufacturing method for manufacturing a stereoscopic image print for reproducing a stereoscopic image, and a stereoscopic image printer.
[0002]
[Prior art and problems to be solved by the invention]
  Holography is a technique for recording and reproducing information on the amplitude and phase of light waves for reproducing a stereoscopic image on a medium. When the object is irradiated with coherent light such as laser light and the recording medium is irradiated with the reflected light (object light) from the object, the recording medium is simultaneously irradiated with another coherent light (reference light). Interference fringes are formed on the recording medium. A hologram is a light intensity distribution resulting from this interference recorded in a medium as a change in refractive index or absorptance. When the recording medium on which the hologram is recorded is irradiated with only the reference light, the hologram functions as a diffraction grating and the object light is reproduced. When an object having a three-dimensional structure is used as a subject, the reproduced image is a stereoscopic image with a natural stereoscopic effect. For this reason, holography is widely used as a technique for displaying a stereoscopic still image.
[0003]
  However, 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 a personally photographed video or a personally created image as a stereoscopic image. In addition, holography has a problem that it is difficult to obtain a full-color image having high image quality and no sense of incongruity.
[0004]
  Images reproduced by normal holography are monochromatic, but there are various color holograms that can record and reproduce color images, for example, as introduced by Junpei Takiuchi's “Holography” by Yukabo (1997). It is being considered.
[0005]
  Leith et al. First proposed a color hologram. In the method of Leith et al., A color image is obtained using three holograms photographed for each color of RGB. First, an object is illuminated with three colors of RGB laser light, and three holograms are photographed for each color of laser light. Next, when each of the three holograms is illuminated by using the same color laser light as that used for photographing, the reproduced images of the three RGB colors appear at the same position to reproduce the color image.
[0006]
  However, there is a drawback that a so-called ghost image appears because each color laser beam is diffracted by each of the three holograms during reproduction. In addition, a reconstructed image without a ghost image can be obtained by placing a Foucault grating on the reference optical system at the time of photographing so that the three holograms do not overlap, but for reproduction, the reference optical system at the time of photographing The same optical system is necessary and complicated.
[0007]
  In addition, a color image can be recorded and reproduced by a rainbow hologram or a Lippmann hologram. The rainbow hologram is taken so that the spatial carrier wave of the hologram is in the horizontal direction. By shooting three rainbow holograms at the respective RGB wavelengths and illuminating them with white light, the reproduced images from the three holograms appear at the same position, and a color image is reproduced. . However, in the rainbow hologram, the position where an image with a correct color balance can be seen is determined, and there is a drawback that the color reproduction becomes worse if the eyes are moved from there.
[0008]
  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 photosensitive material having a thickness such as a silver halide photosensitive material. Reproduced images from the respective photosensitive layers appear at the same position, and a color image is reproduced. However, since the photosensitive layer shrinks during development, there is a drawback that an image different from that during photographing is reproduced during reproduction.
[0009]
  A color hologram can also be created using a stereogram, but a stereogram uses multiple two-dimensional photographic images to write intensity images that can be seen from various angles, up to the light phase control. Not.
[0010]
  Unlike holograms taken normally, a computer-generated hologram is called a computer generated hologram (CGH). This is a hologram created by calculating the structure (amplitude and phase distribution of object light) of the hologram itself using a computer. A hologram synthesized from many ordinary photographs is called a holographic stereogram.
[0011]
Recently, a small device called a hologram printer that synthesizes holographic stereograms from image data stored in a computer has also been developed (M. Yamaguchi, N. Ohyama, T. Honda, "Holographic three-dimensional printer" : new method, "Applied Optics 31, pp.217-222 (1992), Nobuhiro Kihara, Akira Shirakura, Shigeyuki Baba," High-Speed Hologram Portrait Print System, "3D Image Conference '98, pp.257-262 (1998) ). However, this hologram printer has a drawback that a complicated optical system is necessary for exposure using light interference, and high accuracy is required at the time of writing.
[0012]
  It is also possible to display a stereoscopic image from image data stored in a computer 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 refractive index for each fine cell to reproduce a stereoscopic image. Compared with the case where a reproduced image is obtained by diffraction due to interference fringes, this method prevents the appearance of a phase conjugate image and prevents ghost images due to other wavelengths by spatially separating the three primary colors of light RGB. it can. In addition, there is an advantage that high diffraction efficiency can be obtained (a bright image can be reproduced). However, with the current technology, the liquid crystal pixels of the spatial modulator are as large as about 100 μm and it is difficult to increase the area, so that it is difficult to display a stereoscopic image that can withstand viewing. Another disadvantage is that the cost is high for the purpose of enjoying still images.
[0013]
  Further, it is known that the density of a photographic film changes depending on the exposure amount, and relief formation and refractive index change occur due to expansion / contraction. A technique for recording the amplitude distribution and phase distribution of object light calculated by a computer on a photographic film using this is called a kinoform. For example, using a reversal color film, the amplitude distribution is recorded in the red photosensitive layer, and the phase distribution is recorded in the blue photosensitive layer and the green photosensitive layer. The reversal color film after recording can be reproduced with a red laser (HeNe laser) to reproduce character images with parallax (DCChu, JRFienup, JWGoodman, "Multiemulsion on-axis computer generated hologram," Applied Optics 12, pp.1386-1388 (1973)). However, even if a reversal color film is used, the obtained image is a single color image.
[0014]
  As described above, with the conventional holographic technique, a desired three-dimensional image (stereoscopic image print) cannot be easily obtained, and a high-quality, full-color three-dimensional image that does not feel uncomfortable cannot be obtained.
[0015]
  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a stereoscopic image print capable of easily producing a stereoscopic image print for reproducing a full-color stereoscopic image having high image quality and no sense of incongruity. And a stereoscopic image printer.
[0016]
[Means for Solving the Problems]
  In order to achieve the above object, a first method for producing a stereoscopic image print according to the present invention provides a stereoscopic image recording comprising a plurality of photosensitive layers provided corresponding to each color in order to record amplitude information for each color. A stereo image print for producing a stereo image print by recording the phase information and the amplitude information of the image data represented by dividing the phase information for reproducing a stereo image and the amplitude information for each color into small areas on a film. In the manufacturing method, each of the plurality of photosensitive layers is exposed with light modulated for each color in accordance with amplitude information for each small area of the image data and then developed, and the transmittance of each small area is exposed. Amplitude information is recorded according to the amount, so that a filter layer in which multiple color filters for each color are stacked is formed, and phase information can be recorded by changing the application density or application amount per unit area. Phase A recording material is applied to each of the small regions of the filter layer at a coating concentration or a coating amount per unit area corresponding to the phase information for each of the small regions of the image data to form a phase modulation layer. An image print is manufactured.
[0017]
  According to the first manufacturing method, the phase modulation layer is formed by applying the phase recording material using an apparatus having a mechanism similar to that of an ink jet printer or the like. Therefore, the phase modulation layer is formed by exposure and development. Compared to the case, the phase modulation amount can be easily adjusted. Further, since the photosensitive layer is exposed and developed to form a color filter for each color, it is not necessary to separately provide a color separation filter layer, and the manufacturing process is simplified. Thereby, a filter layer in which a plurality of color filters for each color in which the transmittance of each small region has changed according to the exposure amount is laminated, and the application density of the phase recording material to which each optical path length of the corresponding small region is applied or A three-dimensional image print in which a phase modulation layer changed according to the coating amount per unit area is laminated can be easily produced.
[0018]
  In the stereoscopic image print in which the filter layer and the phase modulation layer are stacked, the amplitude of the transmitted light is modulated for each color by the filter layer, and the phase of the transmitted light is modulated by the phase modulation layer. For this reason, when light is incident on the stereoscopic image print, the phase, amplitude, and wavelength of the transmitted light are controlled for each small area, and the recorded stereoscopic image (hologram) 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 reproduction optical system are simplified and the occurrence of ghost is prevented. Further, since the filter layer composed of the color filters for each color is formed by exposing and developing the photosensitive layer, color misregistration is less likely to occur than when the color separation filter is bonded.
[0019]
  Therefore, according to the first manufacturing method of the present invention, it is possible to easily obtain a three-dimensional image print that can reproduce a three-dimensional image having high image quality and no discomfort. In particular, when each of the colors is red, green, and blue, it is possible to easily obtain a three-dimensional image print that can reproduce a full-color three-dimensional image with high image quality and no sense of incongruity.
[0020]
  In the first manufacturing method described above, phase information for reproducing a stereoscopic image and each color are reproduced on a stereoscopic image recording film having a plurality of photosensitive layers provided corresponding to each color in order to record amplitude information for each color. A stereoscopic image printer for producing a stereoscopic image print by recording phase information and amplitude information of image data expressed by dividing the amplitude information for each small region, wherein the amplitude information for each small region of the image data And a light source for each color that outputs light modulated for each color according to the above, and an exposure means for exposing each of the plurality of photosensitive layers of the stereoscopic image recording film with the corresponding light output from the light source for each color; A developing means for developing the stereoscopic image recording film exposed by the exposure means, and a phase recording material capable of recording phase information by changing a coating density or a coating amount per unit area. This is carried out using a stereoscopic image printer provided with a coating means for coating the developed stereoscopic image recording film with a coating density or coating amount per unit area according to phase information for each small area of the image data. Canit can.
[0021]
  AlsoIn order to achieve the above object, the present inventionSecondThe stereoscopic image print manufacturing method records the phase information and amplitude information of the image data represented by dividing the phase information and amplitude information for each color for reproducing the stereoscopic image into small areas on the transparent film, A method for producing a three-dimensional image print for producing a three-dimensional image print, wherein the ink having a different absorption wavelength for each color is applied to the transparent film at a coating concentration or unit according to amplitude information for each small area of the image data. By recording the amplitude information by coating with the coating amount per area, a color ink layer in which a number of color filters for each color are arranged in a plane is formed, and the coating density or the coating amount per unit area is changed. A phase recording material capable of recording phase information by applying the phase recording material to each of the small areas of the color ink layer per coating density or unit area according to the phase information for each small area of the image data. It was coated with the coating amount, to form a phase modulation layer, characterized in that to produce a stereoscopic image print.
[0022]
  aboveSecondAccording to this manufacturing method, a phase recording material is applied using an apparatus having a mechanism similar to that of an ink jet printer or the like to form a phase modulation layer, and inks having different absorption wavelengths are applied for each color. Since the ink layer is formed, the manufacturing process is greatly simplified and the configuration of the printer is simplified as compared with the case where the exposure and development processes are used together. Further, the phase modulation amount can be easily adjusted as compared with the case where the phase modulation layer is formed by exposure and development. As a result, the color ink layer in which a number of color filters for each color in which the transmittance of each small region has changed in accordance with the coating concentration or the coating amount per unit area is arranged in a plane, and the optical path of each corresponding small region A three-dimensional image print in which a phase modulation layer that changes in accordance with the coating concentration or the coating amount per unit area of the phase recording material to which the length is coated can be easily produced.
[0023]
  In the stereoscopic image print in which the color ink layer and the phase modulation layer are laminated, the amplitude of the transmitted light is modulated for each color by the color ink layer, and the phase of the transmitted light is modulated by the phase modulation layer. For this reason, when light is incident on the stereoscopic image print, 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 reproduction optical system are simplified and the occurrence of ghost is prevented. Further, since the color ink layer composed of the color filters for each color is formed by applying ink, color misregistration is less likely to occur than when the color separation filter is bonded.
[0024]
  Therefore, the present inventionSecondAccording to this manufacturing method, it is possible to easily obtain a stereoscopic image print capable of reproducing a stereoscopic image having a high image quality and no sense of incongruity. In particular, when each of the colors is red, green, and blue, it is possible to easily obtain a three-dimensional image print that can reproduce a full-color three-dimensional image with high image quality and no sense of incongruity.
[0025]
  aboveSecondIn this manufacturing method, the phase information and amplitude information of each color for reproducing a stereoscopic image is recorded on a transparent film by recording the phase information and amplitude information of the image data divided into small areas, and a stereoscopic image print is performed. A stereoscopic image printer to be manufactured, in which inks having different absorption wavelengths for each color are applied to the transparent film at an application concentration or an application amount per unit area according to amplitude information for each small area of the image data. A phase recording material capable of recording phase information by changing a coating concentration or a coating amount per unit area, and phase information for each small area of the image data in each of the small areas. It is possible to carry out using a stereoscopic image printer provided with a second coating means for coating at a coating concentration or a coating amount per unit area according to the above. In this printer, no exposure means is required, and the apparatus configuration is simplified.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
  FIG. 1 shows a system configuration of a stereoscopic image printer according to the present embodiment. This stereoscopic image printer is provided with a storage unit 12 for storing a silver salt film 10 wound in a roll shape. A plurality of transport rollers 14 for transporting the silver salt film 10 supplied from the storage unit 12 are arranged along the transport path. The plurality of transport rollers 14 are driven by a transport driving unit (not shown).
[0027]
  On the downstream side of the storage unit 12 in the conveying direction, an exposure unit 15 that scans and exposes the silver salt film 10 with laser light in accordance with image data, develops the exposed silver salt film 10 and fixes and develops the developed film. There are a development processing section 16 to be processed, a dryer 18 for drying the film processed in the development processing section 16, an ink application section 19 for applying ink to the dried film, and a cutter 20 for cutting the film for each image forming area. Arranged in this order.
[0028]
  The exposure unit 15 is reflected by the three color laser light sources of the red laser light source 22R, the green laser light source 22G, and the blue laser light source 22B, the polygon mirror 24 that reflects the laser light emitted from these laser light sources, and the polygon mirror 24. The fθ lens 26 is provided to correct the laser light so that it converges on the surface of the silver salt film 10.
[0029]
  As the laser light sources 22R, 22G, and 22B, solid lasers, fiber lasers, wavelength conversion solid lasers, gas lasers, surface emitting lasers, and the like can be used in addition to semiconductor lasers. Therefore, it is preferable to use a semiconductor laser or a solid-state laser.
[0030]
  For example, a semiconductor laser that emits light in the wavelength range of 600 to 700 nm is used for the red laser light source 22R, and a semiconductor laser-excited wavelength conversion solid-state laser that emits light in the wavelength range of 500 to 600 nm is used for the green laser light source 22G. As the light source 22B, a semiconductor laser-excited wavelength conversion solid-state laser emitting light in the wavelength range of 450 to 500 nm can be used.
[0031]
  Each of the three color laser light sources is modulated by a modulation driving device (not shown) controlled by the computer 28. As the modulation driving device, for example, an external modulator such as an electro-optic modulator (EOM) can be disposed, and the external modulator can be driven to modulate the intensity of the laser light from the laser light source. When a semiconductor laser is used, the semiconductor laser may be directly modulated and driven without using an external modulator. The computer 28 includes a memory, a CPU, a ROM, a RAM, and the like.
[0032]
  In the development processing unit 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.
[0033]
  The ink application unit 19FIG.As shown in FIG. 2, an ink jet recording type writing head 53 for writing by ink ejection is provided. As an ink jet recording method, a known method, for example, a charge control method that ejects ink using electrostatic attraction, a drop-on-demand method (pressure pulse method) that uses vibration pressure of a piezo element, and an electric signal as an acoustic beam In addition, an acoustic ink jet method that irradiates the ink and ejects the ink by using the radiation pressure, and a thermal ink jet method that forms a bubble by heating the ink and uses the generated pressure can be used. . When recording the phase distribution by changing the ink density, a write head 53 having an ink density adjusting mechanism (not shown) for adjusting the ink density is used. The write head 53 is driven by a drive device (not shown) based on a write command signal input from the computer 28.
[0034]
  Next, the layer configuration of the silver salt film 10 used in the above-described stereoscopic image printer will be described. As shown in FIG. 2, the silver salt film 10 is provided with a plurality of photosensitive layers each containing a silver halide emulsion and a color coupler, each having a different sensitivity, like a so-called reversal color film. On the support 36, 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 are laminated in this order from the support side. Yes. These photosensitive layers are formed by coating a photosensitive material containing a silver halide emulsion and a color coupler on a film-like support. Further, an intermediate layer 46 composed of a color filter or the like is inserted between each photosensitive layer in order to increase the single photosensitivity of each photosensitive layer. The intermediate layer 46 may be omitted.
[0035]
  The blue photosensitive layer 38, the green photosensitive layer 40, and the red photosensitive layer 42 (RGB layer) are exposed to laser light having a predetermined wavelength whose intensity is modulated according to the amplitude information, and the light transmittance after development changes. In each of the layers, a color filter whose light transmittance is changed for each small area described later is formed.
[0036]
  Next, a method for producing a stereoscopic image print (stereophotograph) from the silver salt film shown in FIG. 2 using the stereoscopic image printer shown in FIG. 1 will be described. The manufacturing process of a stereoscopic image print is roughly composed of an exposure process, a development process, and an ink application process.
[0037]
  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 from the memory of the computer 28 is read.
[0038]
  The image data for stereoscopic photography is image data represented by dividing phase information for reproducing a stereoscopic image and amplitude information for each color of RGB into small areas described later. Such image data includes, for example, image information including 3D data designed by 3D CAD or the like, or 3D data reconstructed from a 2D image into a 3D image by a computer. It is obtained by calculation in consideration of the position, the position of the reproduction illumination light source, the position of the viewpoint, the shape of the film, and the like.
[0039]
  Next, in step 102, the conveyance of the silver salt film 10 is started. That is, the silver salt film 10 is pulled out of the storage unit 12 so that the red photosensitive layer 42 side faces the exposure unit 15, conveyed at a predetermined speed, and supplied to the exposure unit 15.
[0040]
  Next, in step 104, the three color laser light sources are modulated and driven, and the silver salt film 10 is exposed. As shown in FIGS. 4A and 4B, the predetermined exposure region 48 of the silver salt film 10 is exposed with ultraviolet laser light for each of the small regions 50 arranged in a lattice pattern, and any one of RGB colors. It is exposed with laser light. For example, an R color area exposed with red light, a G color area exposed with green light, and a B color area exposed with blue light are repeatedly arranged in the order of RGB, and the adjacent RGB three color areas are defined as one pixel. Full color exposure is possible. 4A is a plan view of the silver salt film after the development processing, and FIG. 4B is a cross-sectional view of the silver salt film after the development processing. The silver salt film shown in FIG. 4B is provided with a transparent ink layer 44 described later.
[0041]
  The laser light emitted from the red laser light source 22R is intensity-modulated by a light modulator (not shown) driven by a modulation driving device (not shown) based on the amplitude information of the R color. Focused on top. The laser light reflected by the polygon mirror 24 is corrected by the fθ lens 26, converged in a dot shape on the surface of the silver salt film 10 so as to be focused by the red photosensitive layer 42, and a small region corresponding to the R color is exposed. The
[0042]
  Similarly, the laser light emitted from the green laser light source 22G is intensity-modulated based on the amplitude information of the G color, converges in a dot shape so as to be focused by the green photosensitive layer 40, and has a small region corresponding to the G color. Exposed. The laser light emitted from the blue laser light source 22B is intensity-modulated based on the amplitude information of the B color, converges in a dot shape so as to be focused by the blue photosensitive layer 38, and a small region corresponding to the B color is exposed. Is done.
[0043]
  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.
[0044]
  Since the polygon mirror 24 is rotationally driven at a predetermined angular velocity in the direction of arrow A by a polygon drive unit (not shown), the surface of the silver salt film 10 is moved in the direction of arrow B (film width direction) by the laser light reflected by the polygon mirror 24. Main scan is performed. The silver salt film 10 is transported in a predetermined direction by a plurality of transport rollers 14 and is sub-scanned 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 polygon driving unit, the conveyance driving unit, and the modulation driving device are controlled by the computer 28 in synchronization with exposure.
[0045]
  Next, in step 106, it is determined whether or not the exposure according to the input image data has been completed. If the exposure has been completed, the processing routine is terminated and the film transport is stopped. If the exposure has not been completed, the process returns to step 102 to expose the next area.
[0046]
  The development processing step is a step of visualizing (developing) the latent image recorded on the exposed silver salt film 10 and fixing and bleaching the latent image. The silver salt film 10 supplied to the development processing unit 16 is conveyed by the conveyance roller 14, immersed in the developer stored in the developing tank 30, developed, and then the fixing solution stored in the fixing tank 32. Then, it is immersed in a bleaching solution and then bleached and stored in a bleaching solution stored in a bleaching tank 34. Then, the silver salt film 10 processed by the development processing unit 16 is dried by a dryer 18.
[0047]
  The ink application step is a step of applying a transparent ink to the surface of the silver salt film 10 after the development processing. The transparent ink is an ink having a refractive index of 1.01 or more and transparent in the visible range. The ink is obtained by dissolving or dispersing a color material (dye or pigment) in a solvent. The stereoscopic image printer is controlled by a computer 28.FIG.Transparent ink is applied according to the processing routine shown in FIG.
[0048]
  First, in step 200, image data for stereoscopic photography prepared in advance from the memory of the computer 28 is read. Next, in step 202, taking into account the change in the optical path length due to the change in the refractive index and the like according to the exposure amount of the RGB layer due to the shrinkage accompanying the exposure, the optical path length change due to the RGB layer and the optical path due to the transparent ink layer The ink density, which will be described later, is calculated so that the target phase modulation amount can be obtained by the long change.
[0049]
  Next, in step 204, the conveyance of the silver salt film 10 is started. That is, the silver salt film 10 is conveyed at a predetermined speed and supplied to the ink application unit 19 so that the red photosensitive layer 42 side faces the writing head 53.
[0050]
  Next, in step 206, as shown in FIG. 4B, transparent ink is applied to each of the lattice-like small regions 50 on the silver salt film 10 supplied to the ink application unit 19 by using the write head 53. Is done. At this time, the transparent ink layer 44 in which the ink density is changed for each small area is formed by changing the density of the ink applied to each small area, that is, the color material density in the ink, with the ink coating thickness being constant. Is done. Since the ink coating thickness is made constant, the surface of the transparent ink layer 44 is smoothed, and unnecessary light scattering due to the uneven shape is reduced, and a clear hologram is reproduced. The ink density can be adjusted by, for example, preparing two types of inks having different densities and changing the mixing ratio of the two types of inks.
[0051]
  Since the writing head 53 is held by a carriage (not shown) and is reciprocated in the direction of arrow C by a guide (not shown), the surface of the silver salt film 10 is main-scanned in the direction of arrow C (film width direction). The silver salt film 10 is transported in a predetermined direction by a plurality of transport rollers 14 and is sub-scanned in the direction opposite to the transport direction. In this way, the silver salt film 10 is scanned by the writing head 53, and transparent ink having a density corresponding to the image data is applied.
[0052]
  Next, in step 208, it is determined whether or not the writing according to the input image data has been completed. If the writing has been completed, the processing routine is ended and the film conveyance is stopped. If the writing has not been completed, the process returns to step 202 to start writing the next area. After the writing is finished, the silver salt film 10 coated with the transparent ink by the ink coating unit 19 is cut by the cutter 20 for each image forming area.
[0053]
  As a result of the development processing of the silver salt film 10, each of the exposed portions of the RGB layer exposed at the exposure amount corresponding to the image data, that is, each of the small regions develops color at a density corresponding to the exposure intensity. A density (light transmittance) distribution is formed. When one small region is viewed in the stacking direction, only one of the RGB layers is colored, so each layer of the RGB layer becomes a color filter that selectively transmits light of a color (wavelength band) corresponding to each layer. . Thereby, the RGB layer is a filter layer in which RGB color filters for modulating the amplitude of transmitted light according to the wavelength band are stacked. In addition, a transparent ink layer 44 in which the ink density is changed for each small region is formed by ink application. Since the refractive index changes according to the ink density and the optical path length changes according to the refractive index, the transparent ink layer 44 becomes a phase modulation layer that modulates the phase of the transmitted light.
[0054]
  Therefore, when the silver salt film 10 (stereoscopic image print) after ink application is irradiated with white light from the support 36 side, the filter layers (RGB layers after development: blue photosensitive layer 38, green photosensitive layer 40, and red photosensitive layer). 42), the RGB light is absorbed at different ratios for each small region, the transmission wavelength is selected, the amplitude is modulated, the phase is modulated by the transparent ink layer 44 which is a phase modulation layer, and the transmitted light is emitted. The As a result, a full-color stereoscopic image is reproduced. That is,FIG.As shown in FIG. 5, the light is diffracted by the stereoscopic 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 depending on the observation position is observed.
[0055]
  As described above, in the present embodiment, ink having different densities is applied according to the phase information by the ink jet recording head, and the phase modulation layer in which the ink density is changed for each small region is formed. Exposure / development processing is unnecessary, the phase modulation amount can be easily adjusted, and a high-quality stereoscopic image can be obtained. In addition, since the phase information is written in the form of dots instead of writing interference fringes, the writing device can be simplified and the wavefront can be stably reproduced.
[0056]
  In this embodiment, an inexpensive and highly sensitive silver salt film is used as the photosensitive material, so that image data can be written with a low-power laser light source and a stereoscopic image can be created at low cost. Can be used for personal use.
[0057]
  In the present embodiment, image data is written on a silver salt film using a laser light source, so that amplitude information can be recorded using the same method and apparatus as digital exposure on photographic paper. Further, exposure can be performed with high resolution by narrowing the beam waist of the laser beam.
[0058]
  Furthermore, in this embodiment, color filters for each RGB color are formed in the RGB layer by laser exposure.As explained belowThere is no need to attach a color separation filter, and the manufacturing process of the stereoscopic image print is simplified. Also, instead of writing interference fringes, amplitude information for each color is written in dots in each layer of the RGB layer, so that a color hologram without a ghost image is formed.
[0059]
  In the present embodiment, a silver salt film in which three photosensitive layers of 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.
[0060]
  In this embodiment, the phase modulation layer in which the ink coating thickness is constant and the ink density is changed for each small region is formed. However, the phase modulation layer only needs to be able to modulate the phase by changing the optical path length. It is sufficient that at least one of the rate and the thickness is changed. Therefore, a phase modulation layer in which the ink density is constant and the ink coating thickness is changed for each small region may be formed. When the ink coating thickness is changed, unlike the case where the ink density is changed, it is not necessary to provide an ink density adjusting mechanism in the inkjet head, and there is an advantage that the apparatus configuration is simplified. For example, by controlling the ink ejection amount and changing the amount of ink applied for each small region, it is possible to form an ink layer whose ink coating thickness varies for each small region. Since the optical path length changes according to the ink coating thickness, this ink layer becomes a phase modulation layer that modulates the phase of transmitted light.
[0061]
  Further, a phase modulation layer in which both the ink density and the ink coating thickness change for each small region may be formed. Furthermore, a phase modulation layer in which the ink concentration is constant and the ink application ratio is changed for each small region may be formed. The ink application ratio and the above ink coating thickness represent the amount of ink applied per unit area in a broad sense, but the ink application ratio specifically means the ratio of the area where ink is applied in a predetermined area. To do. By changing this ratio, the average optical path length of the area can be changed.it can.
[0062]
(SecondEmbodiment)
  SecondIn the embodiment, an example in which both the filter layer and the phase modulation layer are formed by an inkjet recording method will be described.FIG.Shows the system configuration of the stereoscopic image printer according to the present embodiment. The stereoscopic image printer is provided with a storage portion 62 that stores the transparent film 60 wound in a roll shape. A plurality of transport rollers 64 that transport the transparent film 60 supplied from the storage unit 62 are arranged along the transport path. The plurality of transport rollers 64 are driven by a transport driving unit (not shown).
[0063]
  An ink application unit 66 that applies ink to the transparent film 60 in accordance with image data and a cutter 67 that cuts the film for each image forming area are arranged in this order on the downstream side of the storage unit 62 in the transport direction.
[0064]
  The ink application unit 66 ejects cyan (C), magenta (M), and yellow (Y) color inks (CMY inks) from the nozzles corresponding to the respective colors, and writes a transparent ink. And a writing head 70 which performs writing by jetting. The write heads 68 and 70 are driven by a driving device (not shown) based on a write command signal input from the computer 72.
[0065]
  As the transparent film 60, for example, a transparent resin film such as a polyethylene terephthalate (PET) film can be used.
[0066]
  next,FIG.A method of manufacturing a stereoscopic image print using the stereoscopic image printer shown in FIG. The stereoscopic image printer is controlled by a computer 72.FIG.The CMY ink and the transparent ink are applied to the transparent film 60 according to the processing routine shown in FIG. First, in step 300, image data for stereoscopic photography prepared in advance from the memory of the computer 72 is read. The image data for stereoscopic photography is configured by dividing phase information and amplitude information for reproducing a stereoscopic image into small areas for each RGB color of one pixel.
[0067]
  Next, in step 302, taking into consideration that the refractive index and thickness change according to the ink density and coating thickness of the CMY ink and the optical path length changes, the optical path length change by the CMY ink and the optical path length change by the transparent ink Thus, the ink density of the transparent ink to be applied is calculated so that the target phase modulation amount can be obtained.
[0068]
  Next, in step 304, conveyance of the transparent film 60 is started. That is, the transparent film 60 is pulled out from the storage unit 62, conveyed at a predetermined speed, and supplied to the ink application unit 66. Next, in step 306, on the transparent film 60 supplied to the ink application unit 66,FIG.As shown in FIG. 3, the writing head 68 is used to apply CMY ink to each small area, and the transparent ink is applied from the writing head 70 arranged so as to apply the transparent ink to the small area to which the CMY ink is applied. .
[0069]
  The CMY ink layer 74 having a predetermined color distribution is formed by applying any one of the CMY inks to each of the small regions arranged in a lattice pattern by the writing head 68. That is, the ink ejection amount is controlled based on the amplitude information of the R color, and the C color ink is applied in the form of dots on the surface of the transparent film 60. Similarly, the M color ink is applied based on the amplitude information of the G color, Y color ink is applied based on the amplitude information of B color. For example, a C color region to which C color ink is applied, an M color region to which M color ink is applied, and a Y color region to which Y color ink is applied are repeatedly arranged in order of CMY, and adjacent CMY three color regions are arranged. Full color recording can be performed as one pixel.
[0070]
  At this time, the CMY ink layer 74 in which the color material density is changed for each small area is formed by changing the ink density (ink color material density) applied to each small area while keeping the ink coating thickness constant. Since the light transmittance changes according to the color material density, the CMY ink layer 74 becomes a filter layer that modulates the amplitude of the transmitted light for each color. Note that the ink density of each color of CMY may be constant, the ink coating thickness may be changed for each small region, and the light transmittance may be changed according to the ink coating thickness.
[0071]
  Transparent ink is applied by the writing head 70 to form a transparent ink layer 76 in which the ink density changes for each small region. Since the refractive index changes according to the ink density and the optical path length changes according to the refractive index, the transparent ink layer 76 has a spatial distribution of the phase modulation amount of the transmitted light, and a phase that modulates the phase of the transmitted light. It becomes a modulation layer.
[0072]
  The writing heads 68 and 70 are each held by a carriage (not shown) and reciprocated in the direction of arrow C by a guide (not shown), so that the surface of the transparent film 60 is main-scanned in the direction of arrow C (film width direction). The transparent film 60 is transported in a predetermined direction by a plurality of transport rollers 64, and is sub-scanned in the direction opposite to the transport direction. In this way, the transparent film 60 is scanned by the write heads 68 and 70, and ink is applied according to the image data.
[0073]
  Next, in step 308, it is determined whether or not the writing according to the input image data has been completed. If the writing has been completed, the processing routine is ended and the film conveyance is stopped. If the writing has not been completed, the process returns to step 202 to start writing the next area. The transparent film 60 coated with ink by the ink coating unit 66 is cut by the cutter 67 for each image forming area.
[0074]
  When the transparent film 60 (stereoscopic image print) after ink application is irradiated with white light from the film side, RGB light is absorbed at different rates for each small area by the CMY ink layer 74 as a filter layer, and the transmission wavelength is selected. In addition, the amplitude is modulated, the phase is modulated by the transparent ink layer 76 which is a phase modulation layer, and transmitted light is emitted. As a result, a full-color stereoscopic image is reproduced.
[0075]
  As described above, in this embodiment, since image data is written using an ink jet recording head, a computer generated hologram can be easily recorded using a method and apparatus similar to those of an ink jet printer. In addition, the phase information and amplitude information are written in the form of dots by an ink jet recording head instead of writing interference fringes, so that the writing device can be simplified and the wavefront can be stably reproduced, and a color hologram without a ghost image can be obtained. Played. In particular, a transparent ink having a different density is applied according to the phase information, and the phase modulation layer is formed by changing the refractive index according to the ink density. Adjustment becomes easy and a high-quality stereoscopic image can be obtained.
[0076]
  As in the first embodiment, a phase modulation layer in which the ink coating thickness changes for each small region and a phase modulation layer in which both the ink density and the ink coating thickness change for each small region are formed. Also good. Further, a phase modulation layer in which the ink application ratio changes for each small region may be formed. In the above, four colors of ink, CMY ink and transparent ink, are used, but it is also possible to use five or more colors of ink such as adding black (B) ink.
[0077]
  Other application examples of the present invention will be described below.
[0078]
  1st aboveAnd secondIn the above embodiment, examples of recording amplitude information by laser exposure of a silver salt film and examples of recording amplitude information by applying CMY ink have been described. However, thermal recording materials such as thermal sublimation paper, thermal paper, etc. The amplitude information can also be recorded by heat.
[0079]
  In addition, the firstAnd secondIn the above embodiment, an example in which a projection image is obtained with a laser projector or the like using a transmission type stereoscopic image print has been described. However, by attaching a metal thin film such as aluminum to the support side of the film, a reflection type stereoscopic image is obtained. It can also be used as an image print. In addition to displaying a three-dimensional image, the three-dimensional image print can be used as an optical modulator in optical information communication, and can also be used as a phase wavefront distortion compensation film for light using only a phase modulation layer. .
[0080]
  In addition, the firstAnd secondIn the embodiment, the example in which the film is scanned and exposed with the laser beam has been described. For example, the laser beam having a wide beam diameter is modulated using a spatial light modulator such as a liquid crystal or a micromirror array, and the film is These predetermined areas may be simultaneously exposed (surface exposure). In addition, 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. Moreover, it can also expose with near field light instead of exposing with a laser beam.
[0081]
  In addition, the firstAnd secondIn the above embodiment, an example in which the phase modulation layer is formed by the ink jet recording method has been described. However, the toner in which the pigment is dispersed in the resin binder is fixed by xerography, and the photocurability in which the pigment is dispersed in the resin. The phase modulation layer can also be formed by, for example, photocuring the resin to form a cured resin layer.
[0082]
  In addition, by continuously applying ink and irradiating light using a photocurable ink, the applied ink is cured before spreading and small dots can be formed. Thereby, recording can be performed at high density. Furthermore, the coating thickness of the transparent ink can be reduced by coating the surface of the ink layer with a transparent material having a composition different from that of the ink layer so that the refractive index difference with the ink layer is increased.
[0083]
  Also,FIG.As shown in FIG. 4, a partition 78 that separates the small area from the small area adjacent thereto can be provided on the surface of the transparent film 60. By providing the partition 78 around the small area, it becomes difficult for the ink to spread beyond the partition 78, and ink bleeding is prevented. In this example, a transparent ink layer 76 and a CMY ink layer 74 are laminated on the transparent film 60 in this order. That is, on the transparent film 60, the writing head 70 is used to apply the transparent ink for each small area, and from the writing head 68 arranged to apply the CMY ink to the small area to which the transparent ink is applied. Is applied to form a transparent ink layer 76 and a CMY ink layer 74.
[0084]
【The invention's effect】
  According to the stereoscopic image print manufacturing method and the stereoscopic image printer of the present invention, there is an effect that it is possible to easily manufacture a stereoscopic image print that reproduces a high-quality and color-free stereoscopic image.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a system configuration of a stereoscopic image printer according to a first embodiment.
FIG. 2 is a cross-sectional view showing a 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 according to the first embodiment is used.
FIGS. 4A and 4B are diagrams for explaining a silver salt film exposure method and an ink coating method in the first embodiment, wherein FIG. 4A is a plan view of the silver salt film after development processing, and FIG. It is sectional drawing of the silver salt film at the time of ink application | coating.
[Figure 5]It is the schematic which shows the structure of the ink application part of the stereo image printer which concerns on 1st Embodiment.
[Fig. 6]It is a figure which shows a mode that a three-dimensional object image is observed using the silver salt film after a development process.
[Fig. 7]It is a flowchart which shows the process routine of the ink application | coating process at the time of using the stereo image printer which concerns on 1st Embodiment.
[Fig. 8]It is the schematic which shows the system configuration | structure of the stereo image printer which concerns on 2nd Embodiment.
FIG. 9It is a flowchart which shows the process routine of the ink application | coating process at the time of using the stereo image printer which concerns on 2nd Embodiment.
FIG. 10It is a figure for demonstrating the ink application method in 2nd Embodiment.
FIG. 11It is the schematic which shows the structure which provided the partition which separates the small area | region and the adjacent small area | region on the surface of the transparent film.
[Explanation of symbols]
10,10A silver salt film
12,62 storage section
14,64 Transport roller
15 Exposure section
16 Development processing section
18 Dryer
19, 66 Ink application part
20,67 cutter
22R red laser light source
22G green laser light source
22B Blue laser light source
24 polygon mirror
26 fθ lens
28,72 computers
30 Developer tank
32 Fixing tank
34 Bleaching tank
36 Support
38 Blue sensitive layer
40 Green photosensitive layer
42 Red photosensitive layer
44 Transparent ink layer
46 Middle layer
48 exposure areaArea
50 area
53, 68, 70 Writing head
60 transparent film
74 CMY ink layer
76 Transparent ink layer
78 partition

Claims (4)

In order to record amplitude information for each color, the phase information for reproducing a stereoscopic image and the amplitude information for each color are divided into small areas on a stereoscopic image recording film having a plurality of photosensitive layers provided corresponding to each color. A method of manufacturing a stereoscopic image print for recording phase information and amplitude information of the image data represented and manufacturing a stereoscopic image print,
Each of the plurality of photosensitive layers is developed after being exposed with light modulated for each color according to amplitude information for each small area of the image data, and the transmittance of each small area is changed according to the exposure amount. By recording amplitude information, a filter layer in which a plurality of color filters for each color are stacked is formed,
A phase recording material capable of recording phase information by changing the coating concentration or the coating amount per unit area is applied to each of the small regions of the filter layer according to the phase information for each of the small regions of the image data. Applying at a density or coating amount per unit area, forming a phase modulation layer to produce a stereoscopic image print,
A method for producing a stereoscopic image print. Stereo image print for producing a stereo image print by recording phase information and amplitude information of image data represented by dividing phase information and amplitude information for each color for reproducing a stereo image into small areas on a transparent film A manufacturing method of
By applying ink of a different absorption wavelength for each color to the transparent film at a coating concentration or coating amount per unit area corresponding to the amplitude information for each small area of the image data, and recording the amplitude information In addition to forming a color ink layer in which a number of color filters for each color are arranged in a plane,
A phase recording material capable of recording phase information by changing a coating concentration or a coating amount per unit area is applied to each of the small regions of the color ink layer according to the phase information of each small region of the image data. Applying at a coating concentration or a coating amount per unit area, forming a phase modulation layer, and manufacturing a stereoscopic image print,
A method for producing a stereoscopic image print. In order to record amplitude information for each color, the phase information for reproducing a stereoscopic image and the amplitude information for each color are divided into small areas on a stereoscopic image recording film having a plurality of photosensitive layers provided corresponding to each color. A stereoscopic image printer for recording the phase information and amplitude information of the image data represented and manufacturing a stereoscopic image print,
A light source for each color that outputs light modulated for each color according to amplitude information for each small region of the image data;
Exposure means for exposing each of the plurality of photosensitive layers of the stereoscopic image recording film with the corresponding light output from the light source for each color;
Developing means for developing the stereoscopic image recording film exposed by the exposure means;
  A phase recording material capable of recording phase information by changing the coating concentration or the coating amount per unit area is applied to the stereoscopic image recording film developed by the developing means according to the phase information for each small area of the image data. Coating means for coating at a coating concentration or a coating amount per unit area;
3D image printer. A stereoscopic image printer for producing a stereoscopic image print by recording phase information and amplitude information of image data in which phase information and amplitude information for each color for reproducing a stereoscopic image are divided into small areas on a transparent film. Because
First application means for applying ink of different colors for each color to the transparent film at an application concentration or an application amount per unit area according to amplitude information for each small area of the image data;
A phase recording material capable of recording phase information by changing the coating density or the coating amount per unit area is applied to each of the small areas, and the coating density or unit area according to the phase information for each small area of the image data. A second application means for applying at a per application amount;
3D image printer.

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