JP2005208664A - Image recording method and image recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record an image on a holographic stereogram so that a better reproduced image can be obtained.
Object light is collected and incident on one surface of a hologram recording medium 130, and a light introduction block 137 is optically brought into contact with the other surface, so that reference light is transmitted from an end of the light introduction block 130. The object light and the reference light are made to interfere, and each image based on each image data of the parallax image sequence is sequentially recorded as a strip-shaped or dot-shaped element hologram on the hologram recording medium 130 to record the element hologram Thereafter, for each element hologram, the hologram recording medium 130 is moved with respect to the light introduction block 137 to produce an edge-lit holographic stereogram.
[Selection] Figure 5

Description

  The present invention relates to an image recording method and an image recording apparatus for recording a stereoscopic image in a holographic stereogram.

  A holographic stereogram uses a large number of images obtained by sequentially photographing a subject from different observation points as original images, and sequentially records them as a strip-shaped or dot-shaped element hologram on a single hologram recording medium. It is produced by.

  For example, in a holographic stereogram having parallax information only in the horizontal direction, as shown in FIG. 20, a plurality of original images 301a to 301e obtained by sequentially photographing the subject 300 from different observation points in the horizontal direction are strips. Are sequentially exposed and recorded on the hologram recording medium 302 as a shaped element hologram.

  In this holographic stereogram, image information obtained by sequentially capturing images from different observation points in the horizontal direction is sequentially recorded in the horizontal direction as strip-shaped element holograms. When viewed with both eyes, the two-dimensional images shown in the left and right eyes are slightly different. As a result, the observer feels parallax and a three-dimensional image is reproduced.

  However, the conventional holographic stereogram could not obtain a good reproduced image. Specifically, the conventional holographic stereogram has such problems that the reproduced image is unclear, the reproduced image is dark and has poor contrast, and the viewing angle of the reproduced image is narrow.

  By the way, in a normal hologram, the illumination light source for reproducing a three-dimensional image and the hologram are spatially separated. For this reason, a normal hologram requires a wide space for reproduction, and the positional relationship between the hologram and the illumination light source must be set to a predetermined condition in order to reproduce the optimum hologram. The same applies to a holographic stereogram composed of a plurality of element holograms.

  On the other hand, if the illumination light source and the hologram are integrated, the space for illumination can be eliminated and the size can be reduced, and the positional relationship between the hologram and the illumination light source is always constant. Playback can always be performed under optimum conditions. In order to achieve this, there is an edge-lit hologram in which a recording medium is attached to a transparent light introduction block to perform recording / reproduction.

  In such an edge-lit hologram, the optical system for reproduction can be reduced in size by integrating the light source for reproduction illumination light and the light introduction block, and reproduction is always performed under optimum conditions. be able to. In addition, the edge-lit hologram has a feature that the incident angle of the reproduction illumination light is large, so that the image is not reproduced by the light incident from the outside of the light introduction block. For this reason, edge-lit holograms are increasingly used in fields where it is not desirable when an image is reproduced by light from the sun or the like, such as a head-up display device.

  As described above, in the edge lit method, a hologram recording medium is attached to a transparent light introduction block, and reference light or illumination light is incident at an acute angle with respect to the surface of the hologram recording medium through this light introduction block. Record or play back. Even when this edge-lit method is applied to a holographic stereogram, the illumination light source and the holographic stereogram can be integrated, eliminating the need for a space for illumination. Also, the holographic stereogram and the illumination light source Since the positional relationship is always constant, it is possible to always perform reproduction under optimum conditions.

  When recording is performed by the edge lit method, the light introducing block may be brought into contact with the hologram recording medium from the object light incident side or from the reference light incident side. However, when recording is performed by the edge lit method, it is preferable to provide a one-dimensional diffusion plate and a louver film at the contact portion with the hologram recording medium on the object light incident side. At this time, a one-dimensional diffusion plate and a louver film are arranged on the object light incident side of the hologram recording medium, and a light introduction block is arranged on the reference light incident side of the hologram recording medium. Then, the light introducing block and the hologram recording medium are brought into contact with each other through a liquid. In the following description, when it is necessary to clearly indicate that the light introduction block is arranged on the reference light incident side, the light introduction block is referred to as a reference light introduction block. When the reference light introduction block is brought into contact with the hologram recording medium, an index matching liquid that performs index matching between the hologram recording medium and the reference light introduction block is suitable as the liquid interposed therebetween.

  When recording by the edge-lit method, if the refractive index seems to change greatly between the hologram recording medium and the light introduction block, the reference light incident at an acute angle with respect to the surface of the hologram recording medium is used as the reference light. Problems such as total reflection at the interface between the introduction block and the hologram recording medium, or irregularities on the surface of the image recording layer that is actually recorded on the hologram recording medium appear in the image as uneven grain. Arise.

  By the way, in order to increase the light use efficiency and reduce the image unevenness, it is desirable that the interface through which the reference light passes is small. Therefore, when the edge lit method is adopted, the hologram recording medium and the reference light introduction block may be directly brought into contact with each other without using an index matching liquid, and may be brought into close contact with each other. In particular, when using a hologram recording medium that is relatively soft and sticky like a photopolymer, it is relatively easy to directly contact the hologram recording medium and the reference light introducing block. .

  Also at this time, the vibration of the hologram recording medium can be sufficiently suppressed by bringing the reference light introducing block and the hologram recording medium into close contact with each other without generating a gap therebetween.

  The present invention has been proposed in view of the conventional situation as described above, and provides an image recording method and an image recording apparatus for recording an image on a holographic stereogram so as to obtain a better reproduced image. It was proposed for the purpose of providing.

  From this point of view, the proposed image recording method according to the present invention condenses and enters object light on one surface of a hologram recording medium and optically contacts a light introduction block on the other surface. The reference light is incident from the end of the light introduction block, and the object light and the reference light are caused to interfere with each other to sequentially form each image based on each image data of the parallax image sequence on the hologram recording medium. After recording the element hologram, the hologram recording medium is moved with respect to the light introduction block for each element hologram to produce an edge-lit holographic stereogram. is there.

  The image recording apparatus according to the present invention further includes a light introduction block that optically contacts at least one surface of the hologram recording medium, and the surface of the hologram recording medium that contacts the light introduction block. Condensed and incident object light is incident on another opposing surface, and reference light is incident through the light introduction block, causing the object light and the reference light to interfere with each other to form a parallax image on the hologram recording medium. Each image based on each image data in the column is sequentially recorded as a strip-shaped or dot-shaped element hologram to produce an edge-lit holographic stereogram.

  Here, the light introduction block includes a light absorption member, and the light absorption member causes unnecessary reflection inside the light introduction block after the object light and the reference light incident on the light introduction block reach the hologram recording medium. It is preferable not to make it.

  In the image recording apparatus according to the present invention, for example, a film-like medium is used as the hologram recording medium. At this time, an index matching liquid may be interposed between the hologram recording medium and the light introduction block as described above, but the image is recorded in a state where the hologram recording medium and the light introduction block are in direct contact with each other. It may be recorded.

  In the image recording apparatus according to the present invention, it is preferable that the light introduction block is formed in a substantially cylindrical shape and is rotated with the movement of the hologram recording medium. At this time, it is preferable that the light introduction block is rotated while keeping the hologram recording medium and the light introduction block in contact with each other. The light introduction block has a hollow portion inside, and a light absorbing member is disposed in the hollow portion, and the object light and the reference light incident on the light introduction block are transferred to the hologram recording medium by the light absorption member. It is preferable not to cause unnecessary reflection inside the light introduction block after reaching.

  In addition, the image recording apparatus according to the present invention preferably includes pressing means for pressing the light introducing block against the hologram recording medium.

  In the image recording apparatus according to the present invention, a hologram recording medium having a cover sheet for protecting the photosensitive portion may be used as the hologram recording medium. In this case, it is preferable to provide a cover sheet removing means for peeling off the cover sheet from the hologram recording medium before bringing the hologram recording medium into contact with the light introducing block.

  In addition, the image recording apparatus according to the present invention preferably includes a cleaning unit that removes dirt on the light introduction block. In the second image recording apparatus, it is preferable that a one-dimensional diffusion plate is disposed in the vicinity of the hologram recording medium and on the side on which the object light is incident.

  According to the image recording method and the image recording apparatus of the present invention, it is possible to easily produce an edge-lit holographic stereogram that can be reproduced in a transmission type. In addition, vibration can be sufficiently suppressed when recording on the hologram recording medium. For this reason, accurate recording becomes possible, and the diffraction efficiency during reproduction can be improved. That is, according to the image recording method and the image recording apparatus of the present invention, it is possible to produce an edge-lit holographic stereogram from which a bright and clear reproduced image can be obtained. Moreover, it is possible to greatly reduce the waiting time until the vibration is attenuated after the transfer of the hologram recording medium, and the hologram recording medium is transferred every time one-element hologram is recorded. In manufacturing the process time, the process time can be greatly shortened.

  Embodiments of an image recording method and an image recording apparatus according to the present invention will be described.

1-1 Outline of Image Recording Apparatus An outline of a holographic stereogram printer system that is an embodiment of an image recording apparatus according to the present invention will be described.

  FIG. 1 shows the configuration of this holographic stereogram printer system 100. The holographic stereogram printer system 100 includes a data processing unit 101, a control computer 102, and a holographic stereogram printer device 103.

  The data processing unit 101 captures a real object output from the parallax image sequence photographing device 111 from a plurality of observation points having different lateral directions (for example, simultaneous photographing with a multi-lens camera or continuous photographing with a mobile camera). A parallax image sequence is obtained based on the obtained image data D11 for a plurality of images or each image data D12 of a plurality of rendering images that are output from the image data generation computer 112 and sequentially generated with parallax. After generating and performing image processing for a predetermined hologram on the image data D13 of the parallax image sequence by the image processing computer 113 to obtain hologram image data D14, these are recorded in a recording medium 114 such as a memory or a hard disk. Tentatively record.

  Further, during the subsequent exposure operation, the data processing unit 101 sequentially reads the image data D14 of the parallax image sequence recorded on the recording medium 114, and sequentially reads the read image data D15 to the control computer 102. Send it out.

  Based on the image data D15 of the parallax image sequence supplied from the data processing unit 101 during the exposure operation, the control computer 102 controls the shutter 132 of the holographic stereogram printer device 103, the LCD 141, and a printer head unit described later. Drive control.

  The holographic stereogram printer apparatus 103 has a configuration as shown in FIG. 2 in which the same reference numerals are assigned to the corresponding parts as in FIG. 1, and the LCD 141 is based on the image data D15 supplied from the control computer 102 described above. Is driven to sequentially record each image based on the image data D15 as a strip-shaped element hologram on the hologram recording medium 130, thereby producing a holographic stereogram. Here, as the hologram recording medium 130, for example, the same one as described in the first embodiment of the image recording method and the image recording apparatus may be used.

  The holographic stereogram printer device 103 displays an image based on the image data D15 on the LCD 141 by driving the LCD 141 based on one of the image data D15 supplied from the control computer 102. By sending a control signal S11 from the control computer 102 to the shutter 132 and driving it so as to open it, the laser light L11 emitted from the laser light source 131 is sequentially passed through the shutter 132, the half mirror 133, and the mirror 138. The light is incident on the spatial filter 139.

  The laser light L11 is spread by a spatial filter 139 and then collimated by a collimator lens 140. Thereafter, the light is converted into projection light corresponding to the image displayed on the LCD 141 by being transmitted through the LCD 141, and then the projection light is incident on the cylindrical lens 143 and collected in the lateral direction by the cylindrical lens 143. Thereafter, the light enters the hologram recording medium 130 held by the printer head unit 150.

  Here, a one-dimensional diffusion plate 144 having a diffusivity only in the vertical direction is disposed at a position immediately before the object light is incident and is not touching the hologram recording medium 130. This is for ensuring a vertical viewing angle when reproducing and observing a holographic stereogram.

  On the other hand, the laser light L11 reflected by the half mirror 133 is incident as a reference light from the back surface side of the hologram recording medium 130 through the cylindrical lens 134, the collimator lens 135, and the mirror 136 sequentially. At this time, since the surface reflection on the surface of the hologram recording medium 130 increases when the incident angle of the reference light is increased, the light introducing block 137 is prepared and the reference light is incident from the end thereof. In this case, the optical path length of the reference light is substantially the same as the optical path length of the laser light L11 (hereinafter referred to as object light) that passes through the half mirror 133 and then enters the hologram recording medium 130 via the mirror 138. Is selected.

  Thus, in the holographic stereogram printer device 103, the object light (projection light) and the reference light can be made to interfere on the recording surface of the hologram recording medium 130, whereby the image displayed on the LCD 141 is used for the hologram. The recording medium 130 can be recorded in the form of strips as interference fringes.

  Further, in this holographic stereogram printer device 103, when the recording of this image is finished thereafter, the shutter 132 is driven by the control computer 102 to shield the laser light L11 emitted from the laser light source 131 and to the LCD 141. And the printer head unit 150 is driven under the control of the control computer 102, and the hologram recording medium 130 is fed by the width of one element hologram.

  Thereafter, the LCD 141 is driven by the control of the control computer 102 to display an image based on the subsequent image data D15, and then the shutter 132 is opened by the control of the control computer 102 and the image displayed on the LCD 141 is used for the hologram. While recording on the recording medium 130, the same operation | movement is repeated sequentially after this.

  In this way, in the holographic stereogram printer device 103, each image based on each image data of the supplied parallax image sequence can be sequentially recorded on the hologram recording medium 130 in a strip shape. Thus, a desired holographic stereogram can be obtained.

  By the way, when an image is recorded on the hologram recording medium 130 in this way, two holograms that can be reproduced in a reflection type and two that can be reproduced in a transmission type can be formed simultaneously. This mechanism will be described with reference to FIG. Here, in order to simplify the description, it is assumed that the refractive index of the light introduction block 137 and the refractive index of the hologram recording medium 130 are equal.

  As shown in FIG. 3, the light L11A incident on the hologram recording medium 130 through the light introducing block 137 as the reference light travels straight inside the hologram recording medium 130, and is then totally reflected at the interface 130a with air. To do. The light L11B returned by this total reflection is also used as reference light. As a result, the hologram recording medium is irradiated with two types of reference beams having different traveling directions. Therefore, if the illumination light corresponding to the light L11A before being totally reflected is irradiated as the reproduction illumination light for the holographic stereogram produced in this way, it can be reproduced in a reflection type. If the illumination light corresponding to the reflected light L11B is irradiated, it can be reproduced in a transmission type.

  Whether the reference light is totally reflected at the interface 130a between the hologram recording medium 130 and air depends on the refractive index of the hologram recording medium 130 and the incident angle of the reference light. Therefore, in the present embodiment, it is assumed that the refractive index of the hologram recording medium 130 and the incident angle of the reference light are set so that the reference light is totally reflected.

  Conversely, when the reference light is not totally reflected at the interface 130a between the hologram recording medium 130 and the air, that is, when the reference light is transmitted through the hologram recording medium 130, the hologram recording medium 130 is removed. When the transmitted reference light is incident on the one-dimensional diffusion plate 144 arranged on the object light incident side for the purpose of diffusing the object light, the reference light is reflected by the one-dimensional diffusion plate 144 and again enters the hologram recording medium 130. Incident. Thus, the light reflected by the one-dimensional diffusion plate 144 and incident on the hologram recording medium 130 again becomes a noise component in recording an image.

  Therefore, in order to prevent such re-incidence of light, when the reference light is not totally reflected at the interface 130a between the hologram recording medium 130 and air, as shown in FIG. A louver film 145 needs to be disposed between the recording medium 130. This prevents the reference light from being reflected by the one-dimensional diffusion plate 144 and entering the hologram recording medium 130 again.

  Since such a louver film 145 is arranged in the optical path of the object light, the louver film 145 becomes a factor that disturbs the object light, and causes a reduction in image uniformity and brightness. On the other hand, if the reference light is totally reflected at the interface 130a between the hologram recording medium 130 and the air, the reference light does not pass through the hologram recording medium 130, so that the louver film 145 becomes unnecessary. Therefore, the uniformity and brightness of the recorded image are improved. In addition, since the louver film 145 is unnecessary, the optical system can be simplified.

  In order to increase the sharpness of the recorded image, the one-dimensional diffusion plate 144 is preferably arranged as close as possible to the hologram recording medium 130. However, a gap is provided between the hologram recording medium 130 and the one-dimensional diffusion plate 144 so that the reference light is totally reflected at the interface of the hologram recording medium 130. That is, air is interposed between the one-dimensional diffusion plate 144 and the hologram recording medium 130 so that the reference light is totally reflected at the interface 130a between the hologram recording medium 130 and the air.

  In addition, a substance having a refractive index that satisfies the condition that the reference light is totally reflected at the interface with the hologram recording medium 130 is not interposed between the one-dimensional diffusion plate 144 and the hologram recording medium 130. You may make it make it. That is, the hologram recording medium 130, the spacer having a refractive index that satisfies the condition for total reflection of the reference light, and the one-dimensional diffusion plate 144 may be arranged to overlap each other.

  By the way, the image recording apparatus according to the present invention allows object light to be incident on one surface of the hologram recording medium and reference light to be incident on the other surface of the hologram recording medium, whereby each image data of the parallax image sequence is input. Each image based thereon is sequentially recorded as a strip-shaped or dot-shaped element hologram, and includes an optical component that comes into contact with the reference light incident surface of the hologram recording medium.

  For this reason, in the holographic stereogram printer system 100, the point that is the point of the present invention is the configuration of the holographic stereogram printer device 103, particularly the configuration near the printer head unit 150. Therefore, an embodiment of the image recording apparatus will be described below by describing in detail a configuration example near the printer head unit 150.

1-2 First Embodiment The image recording apparatus according to the present embodiment is configured such that optical components are in contact with the reference light incident side of the hologram recording medium 130 so that there is no gap. In addition, the image recording method according to the present embodiment produces a holographic stereogram using the image recording apparatus configured as described above.

  Hereinafter, in order to describe the image recording apparatus according to the present embodiment, a configuration in the vicinity of the printer head unit 150 of the holographic stereogram printer apparatus 103 in the holographic stereogram printer system 100 described above will be described in detail. In the present embodiment, the printer head unit 150 is configured as a printer head unit 150-1 as shown in FIG.

  The printer head unit 150-1 has a mechanism for holding and transferring the hologram recording medium 130.

  That is, the roller 152 in the film cartridge 151 loaded at a predetermined position is rotatably supported with a predetermined torque, and the hologram recording medium 130 pulled out from the film cartridge 151 is transferred to the first intermittent feed roller. 153A and the second intermittent feeding roller 153B can be sandwiched and held.

  Further, between these rollers 152 and the intermittent feeding rollers 153A and 153B, a light introduction block 137A made of a transparent rigid body such as glass is an incident position of the object light, and the object light is incident thereon. It is arranged on the surface opposite to the surface to be in contact with the hologram recording medium 130. The light introduction block 137A has a cylindrical shape and is held so as to be rotatable about the axis by a holding mechanism (not shown).

  The hologram recording medium 130 is in contact with the light introduction block 137A between the roller 152 and the intermittent feed rollers 153A and 153B, and in the portion in contact with the light introduction block 137A. The object light is incident on the hologram recording medium 130 perpendicularly.

  Here, the hologram recording medium 130 incorporated in the film cartridge 151 has a cover sheet for protecting the photosensitive portion. That is, in the initial state, the hologram recording medium 130 has a so-called sandwich structure in which a photopolymer layer serving as a photosensitive portion is sandwiched between a base film material and a cover film. It is wound around a roller 152 in the cartridge 151 and stored. Then, in the printer head unit 150-1, as shown in FIG. 5, the cover sheet 130a is peeled off from the hologram recording medium 130 before the hologram recording medium 130 led out from the film cartridge 151 is brought into contact with the light introducing block 137A. The cover sheet 130a is wound around another roll 154. Then, the hologram recording medium 130 from which the cover sheet 130a has been peeled is led out to the light introducing block 137A so that the object light incident side becomes a base film material and the reference light incident side becomes a photopolymer layer.

  In addition, when using a recording medium without a cover sheet as the hologram recording medium 130, it is naturally not necessary to peel the cover sheet and wind it up on another roll. That is, as shown in FIG. 6, the hologram recording medium 130 in which the photopolymer layer is formed on the base film material is guided as it is to the light introduction block 137A without removing the cover film from the hologram recording medium 130. May be. The printer head unit 150-2 shown in FIG. 6 is the same as the printer head unit 150-1 shown in FIG. 5 except that the configuration of the film cartridge 151 is slightly different.

  The light introducing block 137A is for guiding the reference light to the hologram recording medium 130, and the reference light is incident from one end face. The light introducing block 130 includes a first pressing roller 155A and a second pressing roller 155B disposed on the object light incident side, and a third pressing roller 155C disposed on the reference light incident side. Is supported by. Here, the positions of the first pressing roller 155A and the second pressing roller 155B are fixed, while the position of the third pressing roller 155C is the front and rear as shown by the arrow d in FIG. It is possible to move to. The hologram recording medium 130 is passed between the first pressing roller 155A and the light introducing block 130, and is also passed between the second pressing roller 155B and the light introducing block 130. In this state, the third pressing roller 155C moves as indicated by an arrow d in FIG. 5 and moves toward the light introduction block 137A in the direction of pressing against the first pressing roller 155A and the second pressing roller 155B. Apply pressure to it. Accordingly, the hologram recording medium 130 and the light introduction block 137A are supported in a state where the hologram recording medium 130 is pressed against the light introduction block 137A.

  That is, as described above, the hologram recording medium 130 is led out from the film cartridge 151 so that the object light incident side is a base film material, and the reference light incident side, that is, the light introduction block 137A side is a photopolymer layer. The photopolymer layer is held in close contact with the light introduction block 137A so that there is no gap between the photopolymer layer and the light introduction block 137A.

  In the printer head unit 150-1 provided with such a light introduction block 137A, the light introduction block 137A is a rigid body and is positioned by a bearing (not shown). Vibration can be suppressed very efficiently. As a result, a bright (high diffraction efficiency) holographic stereogram can be obtained.

  Further, the printer head unit 150-1 includes a cleaning member 156 in a portion of the light introducing block 137A that is not in contact with the hologram recording medium 130. The cleaning member 156 removes dust and the like attached to the side surface of the rotating light introduction block 137A. For example, the cleaning member 156 is made of a urethane rubber plate or a soft cloth so as to be in contact with the side surface of the light introduction block 137A. Is held in.

  For example, when dust or the like in the air adheres to the light introduction block 137A, or when the hologram recording medium 130 on which element hologram recording has been completed is peeled off from the light introduction block 137A, the hologram is placed on the light introduction block 137A. A part of the recording medium 130 may remain. The cleaning member 156 removes a part of the hologram recording medium 130 remaining on the light introduction block 137A and dust in the air from the light introduction block 137A. As a result, the light introduction block 137A is completely clean before contacting the hologram recording medium 130. That is, in the printer head unit 150-1, the light introduction block 137A is cleaned, and the light introduction block 137A and the hologram recording medium 130 come into close contact with each other.

  Here, the cleaning member 156 is incorporated in the film cartridge 151, and when the film cartridge 151 is incorporated in the printer head unit 150-1, the cleaning member 156 is in contact with the side surface of the light introduction block 137A. Accordingly, when the film cartridge 151 containing the hologram recording medium 130 is replaced, the cleaning member 156 can be replaced at the same time, which makes maintenance very easy.

  On the other hand, the first intermittent feed roller 153A and the second intermittent feed roller 153B can freely rotate in the direction indicated by the arrow e based on the rotational force output from a stepping motor (not shown). Yes. The stepping motor rotates the intermittent feeding rollers 153A and 153B sequentially by a predetermined angle every time exposure of one image is completed based on a control signal S12 supplied from the control computer 102. As a result, the hologram recording medium 130 is sent by one element hologram every time exposure of one image is completed.

  Further, an ultraviolet lamp 157 is disposed along the course of the hologram recording medium 130 along the course behind the intermittent feeding rollers 153A and 153B. The exposed portion of the hologram recording medium 130 is irradiated with ultraviolet light L13 for ending the diffusion of the monomer M with a predetermined power.

  Further, in the path of the hologram recording medium 130, a heat roller 158 that is rotatably supported, a pair of feed discharge rollers 159 A and 159 B, and a cutter 160 are sequentially arranged at the subsequent stage of the ultraviolet lamp 157. Yes. Here, the discharge feed rollers 159A and 159B are configured to hold the hologram recording medium 130 so as to be wound in a state of being in close contact with the circumferential surface of the heat roller 158 over a half circumference.

  Inside the heat roller 158, a heating means (not shown) such as a heater is provided so that the peripheral surface can maintain a temperature of about 120 ° C. In addition, this temperature setting includes a heating plate whose temperature is controlled so that the photopolymerized photopolymer (OMN1-DEX) after exposure is kept at a constant temperature of 120 [° C.], and a glass plate pressed by a spring force from above. This is because it was confirmed by experiment that the refractive index modulation degree of the same level as that obtained when the atmosphere was heated at 120 ° C. for 2 hours by being sandwiched between and heated for 5 minutes was obtained.

  The outer diameter of the heat roller 158 is selected so that it takes time to fix the recorded image from when the hologram recording medium 130 starts to come into contact with the peripheral surface of the heat roller 158 until the heat roller 158 moves away. The image recorded on the hologram recording medium 130 that has passed through can be reliably fixed.

  A drive mechanism (not shown) of the discharge feed rollers 159A and 159B (hereinafter referred to as a discharge feed roller drive mechanism) is a control signal output from the control computer 102 when the hologram recording medium 130 is intermittently fed. Based on S12, the discharge feed rollers 159A and 159B are rotated in synchronization with the intermittent feed rollers 153A and 153B. Thus, the hologram recording medium 130 is securely held in close contact with the peripheral surface of the heat roller without being loosened between the intermittent feed rollers 153A and 153B and the discharge feed rollers 159A and 159B. it can.

  Further, a driving mechanism (not shown) of the cutter 160 (hereinafter referred to as a cutter driving mechanism) records a desired image on the hologram recording medium 130 based on a control signal S12 supplied from the control computer 102, and then The cutter 160 is driven at the stage where all the areas where the image of the hologram recording medium 130 is recorded are ejected to the outside of the cutter 160, and this part is separated from the other parts. As a result, the portion of the hologram recording medium 130 where the image is recorded can be discharged to the outside as a single holographic stereogram.

  Here, in order to describe the image recording method according to the present embodiment, the operation of the holographic stereogram printer apparatus 103 including the above-described printer head unit 150-1 will be described in detail.

  In order to produce a holographic stereogram using the above-described holographic stereogram printer device 103, first, the hologram recording medium 130 is stored in a film cartridge 151 while being wound around a roller 152.

  Then, the cover film 130 a is peeled from the hologram recording medium 130. Then, the peeled cover film 130 a is wound around a roll 154. On the other hand, the hologram recording medium 130 from which the cover film 130a has been peeled, that is, the portion in which the photopolymer layer is formed on the base film material, has no gap between the first pressing roller 155A and the second pressing roller 155B. In this manner, it is loaded onto the intermittent feed rollers 155A and 155B in a state of being pressed by the light introduction block 137A.

  Next, image data D15 based on each image in the parallax image sequence is supplied from the control computer 102 to the LCD 141, and the LCD 141 is driven to display an image based on the image data D15. Further, the control computer 102 sends a control signal S11 to the shutter 132 to open the shutter 132, so that the laser light L11 emitted from the laser light source 131 is incident on the hologram recording medium 130 through the LCD 141. Let At this time, the laser light L11 is emitted from the laser light source 131 and then sequentially passes through the shutter 132, the half mirror 133, the mirror 138, the spatial filter 139, and the collimator lens 140 as described above. Is incident on the recording medium 130 as object light (projection light). In addition, half of the laser light L11 emitted from the laser light source 131 and incident on the half mirror 133 via the shutter 132 is reflected by the half mirror 133, and sequentially passes through the cylindrical lens 134, the collimator lens 135, and the mirror 136 for hologram. The light enters the recording medium 130 from the back side as reference light.

  In this way, the object light and the reference light are caused to interfere with each other on the hologram recording medium 130 and are exposed, whereby the image displayed on the LCD 141 is recorded as interference fringes in a strip shape on the hologram recording medium 130.

  When the recording of the image is finished, the shutter 132 is closed under the control of the control computer 102, the laser light L11 emitted from the laser light source 131 is shut off, and the driving of the LCD 141 is stopped. Further, the control computer 102 sends the control signal S12 to the stepping motor and the discharge feed roller drive mechanism of the printer head unit 150-1 to drive them, thereby feeding the hologram recording medium 130 by one element hologram. Make it.

  When the hologram recording medium 130 is sent, the hologram recording medium 130 is sent while keeping the hologram recording medium 130 in close contact with the light introduction block 137A without separating the light introduction block 137A from the hologram recording medium 130. Like that. The light introduction block 137A itself does not have a drive mechanism, but has a structure that can freely rotate. Therefore, if the hologram recording medium 130 is sent without being separated from the light introduction block 137A, the hologram recording medium is correspondingly increased. With the movement of 130, the light introduction block 137A also rotates. That is, in the printer head unit 150-1, the light introduction block 137A is rotated while keeping the hologram recording medium 130 and the light introduction block 137A in contact with each other.

  Thereafter, an operation for displaying an image based on the image data D15 on the LCD 141, an operation for opening the shutter 132 and causing the object light and the reference light to interfere with each other on the hologram recording medium 130, and driving the stepping motor and the discharge feed roller By repeating the operation of sending the hologram recording medium 130 by one element hologram by the mechanism, each image data D15 based on each image of the parallax image sequence supplied from the data processing unit 101 is sequentially transferred to the hologram recording medium 130. Record in strips.

  At this time, in the printer head unit 150-1, the hologram recording medium 130 that is intermittently fed sequentially by the ultraviolet lamp 157 is located behind the portion of the hologram recording medium 130 that is exposed to object light and reference light. The ultraviolet ray L13 is irradiated over the entire surface. Thereby, in the hologram recording medium 130, the polymerization of the monomer M in the exposed portion of the photopolymer layer is completed.

  In addition, the hologram recording medium 130 is heated by the heat roller 158 on the rear side of the ultraviolet lamp 157. As a result, the refractive index modulation degree of the photopolymer layer increases, and the recorded image is fixed. Further, on the downstream side of the heat roller 158, the cutter driving mechanism is driven based on the control signal S12 supplied from the control computer 102, and the completed holographic stereogram is cut into a desired size by the cutter 160. And discharged to the outside.

  As described above, when a desired image is recorded on the hologram recording medium 130, the pressing rollers 155A and 155B are continuously used so that there is no gap between the hologram recording medium 130 and the light introduction block 137A. By bringing the hologram recording medium 130 and the light introduction block 137A into contact with each other while extruding air, the reference light can be incident at a steep angle without interposing an index matching liquid or the like. The light introduction block 137A is a rigid body, and its relative position is fixed to the housing or the like in a rigid manner. Therefore, the vibration of the hologram recording medium 130 held in close contact with the light introducing block 137A is sufficiently suppressed.

  Whether or not the hologram recording medium 130 can be closely attached to the light introduction block 137A depends on the characteristics of the hologram recording medium 130, particularly hardness, adhesiveness, and thickness. Since the photopolymer 130 is generally moderately soft, it can be relatively easily adhered to the light introduction block 137A without a gap. Actually, DuPont's product name: OMNI-DEX was used for the photopolymer layer of the hologram recording medium 130, and the film thickness was about 20 μm. It was possible to make good close contact with no gap.

1-3 Second Embodiment The image recording apparatus according to the present embodiment performs edge-lit recording via an index matching liquid, and a liquid is provided on the reference light incident side of the hologram recording medium 130. Thus, the light introduction block comes into contact. In addition, the image recording method according to the present embodiment produces a holographic stereogram using the image recording apparatus configured as described above.

  Even when edge-lit recording is performed via the index matching liquid, the configuration of the holographic stereogram printer system is the same as described with reference to FIG. 1, and the configuration of the holographic stereogram printer device also includes a light introduction block. Except for some changes, the process is the same as described with reference to FIG.

  Hereinafter, in order to describe the image recording apparatus according to the present embodiment, a configuration in the vicinity of the printer head unit 150 in the holographic stereogram printer apparatus 103 will be described in detail. In the present embodiment, the printer head unit 150 is configured as a printer head unit 150-3 as shown in FIG.

  In the printer head unit 150-3, the hologram recording medium 130 is loaded in the same manner as the printer head unit 150-2 shown in FIG. Members common to the printer head unit 150-1 shown in FIG. 5 and the printer head unit 150-2 shown in FIG.

  In the printer head unit 150-3, the one-dimensional diffusion plate 144 is disposed at a position separated from the hologram recording medium 130. Further, in the printer head unit 150-3, a light introduction block 137B made of transparent glass is arranged at a position corresponding to the incident position of the reference light so as to contact the hologram recording medium 130. The light introduction block 137B is configured to allow reference light to be incident from an end portion and to make the reference light incident at an acute angle with respect to the surface of the hologram recording medium 130 when performing recording by the edge lit method. Here, glass BK7 having a refractive index of 1.51 was used.

  Therefore, interference fringes are generated on the hologram recording medium 130 by the object light incident perpendicularly to the surface of the hologram recording medium 130 and the reference light incident at an acute angle with respect to the surface of the hologram recording medium 130. Will be formed.

  Here, since the light introduction block 137B is provided so as to contact the hologram recording medium 130, minute vibrations of the hologram recording medium 130 between the film cartridge 151 and the intermittent feeding rollers 153A and 153B are caused. This makes it possible to form a bright (high diffraction efficiency) holographic stereogram.

  Further, in the present embodiment, a sponge 161 containing a liquid as a liquid supply means is in contact with both the light introduction block 137B and the hologram recording medium 130 in the preceding stage of the light introduction block 137B. Is arranged. The width of the sponge 161 is made smaller than the width of the hologram recording medium 130 in order to prevent the liquid from reaching the back side of the hologram recording medium 130.

  Here, as the liquid contained in the sponge 161, o-xylene having a refractive index that enables index matching between the hologram recording medium 130 and the light introducing block 137B is used. The conditions of the liquid interposed between the light introduction block 137B and the hologram recording medium 130 are the same as those described in the first embodiment of the image recording method and the image recording apparatus.

  By arranging the sponge 161, liquid is continuously supplied between the hologram recording medium 130 and the light introduction block 137B, and the liquid is always interposed between the hologram recording medium 130 and the light introduction block 137B. I will be able to let you. As a result, the light introduction block 137B and the hologram recording medium 130 can be brought into close contact with each other without generating a gap therebetween, so that the vibration of the hologram recording medium 130 can be sufficiently suppressed. become.

  Further, since the liquid supplied between the hologram recording medium 130 and the light introduction block 137B performs index matching, the light introduction is performed when the reference light that has passed through the light introduction block 137B is incident on the hologram recording medium 130. There is no total reflection in the block 137B. Therefore, an excellent image quality holographic stereogram can be produced.

  Further, as described above, if a liquid is interposed between the hologram recording medium 130 and the light introduction block 137B, the hologram recording medium 130 may be moved without moving the light introduction block 137B away from the hologram introduction medium 137B. Can be intermittently fed. For this reason, a drive mechanism for moving the light introducing block 137B close to / separating from the hologram recording medium 130 can be omitted, and the configuration of the image recording apparatus can be simplified.

  In addition, as a method of interposing a liquid between the hologram recording medium 130 and the light introduction block 137B, it may be possible to arrange the hologram recording medium 130, the light introduction block 137B, and the like in the liquid. Since the hologram recording medium 130 and the light introduction block 137B are arranged in the air and the liquid is held by the surface tension, the configuration of the image recording apparatus can be simplified and the maintenance is easy.

  In this printer head unit 150-3, the configuration on the downstream side of the intermittent feed rollers 153A and 153B is the same as that of the printer head unit 150-1 shown in FIG. 5 or the printer head unit 150-2 shown in FIG. Therefore, the description is omitted.

  Here, in order to describe the image recording method according to the present embodiment, the operation of the holographic stereogram printer apparatus including the printer head unit 150-3 described above will be described in detail.

  In order to produce a holographic stereogram using the above-described holographic stereogram printer device 103, first, the hologram recording medium 130 is stored in a film cartridge 151 while being wound around a roller 152. Then, the hologram recording medium 130 is loaded between the film cartridge 151 and the intermittent feeding rollers 153A and 153B, and the light introduction block 137B is set so as to contact the hologram recording medium 130. Here, the sponge 161 as the liquid supply means is sufficiently filled with liquid.

  Before actually recording on the hologram recording medium 130, the control computer 102 sends the control signal S12 to the stepping motor and discharge roller driving mechanism of the printer head unit 150-3 to drive them. Then, the hologram recording medium 130 is sent for the length of the contact between the hologram recording medium 130 and the light introducing block 137B.

  Accordingly, the liquid is supplied from the sponge 161 to the hologram recording medium 130 at a position where the hologram recording medium 130 starts to come into contact with the light introduction block 137B, and comes into contact with the light introduction block 137B in a state where the liquid is held. A liquid can be interposed between the recording medium 130 and the light introduction block 137B.

  Next, image data D15 based on each image in the parallax image sequence is supplied from the control computer 102 to the LCD 141, and the LCD 141 is driven to display an image based on the image data D15.

  Further, the control computer 102 sends a control signal S12 to the shutter 132 to open the shutter 132, so that the laser light L11 emitted from the laser light source 131 is incident on the hologram recording medium 130 through the LCD 141. Let At this time, the laser light L11 is emitted from the laser light source 131 and then sequentially passes through the shutter 132, the half mirror 133, the mirror 138, the spatial filter 139, and the collimator lens 140, as described above. Is incident on the recording medium 130 as object light (projection light). Further, half of the laser light L11 emitted from the laser light source 131 and incident on the half mirror 133 via the shutter 132 is reflected and sequentially passes through the cylindrical lens 134, the collimator lens 135, and the mirror 136, and then the light introduction block. Through 137B, the light enters the hologram recording medium 130 from the back side as reference light.

  In this way, the object light and the reference light are caused to interfere with each other on the hologram recording medium 130 and are exposed, whereby the image displayed on the LCD 141 is recorded as interference fringes in a strip shape on the hologram recording medium 130.

  When the recording of the image is finished, the shutter 132 is closed under the control of the control computer 102, the laser light L11 emitted from the laser light source 131 is shut off, and the driving of the LCD 141 is stopped.

  Further, the control computer 102 sends the control signal S12 to the stepping motor and the discharge feed roller driving mechanism of the printer head unit 150-3 to drive them, thereby feeding the hologram recording medium 130 by one element hologram. Make it. When the hologram recording medium 130 is intermittently fed, it is not necessary to separate the light introduction block 137B from the hologram recording medium 130.

  Thereafter, an operation for displaying an image based on the image data D15 on the LCD 141, an operation for opening the shutter 132 and causing the object light and the reference light to interfere with each other on the hologram recording medium 130, and driving the stepping motor and the discharge feed roller By repeating the operation of sending the hologram recording medium 130 by one element hologram by the mechanism, each image data D15 based on each image of the parallax image sequence supplied from the data processing unit 101 is sequentially transferred to the hologram recording medium 130. Record in strips.

  At this time, in the printer head unit 150-3, on the downstream side of the portion where the hologram recording medium 130 is exposed with the object light and the reference light, the ultraviolet recording lamp 130 is sequentially intermittently fed by the ultraviolet lamp 157. The ultraviolet ray L13 is irradiated over the entire surface. Thereby, in the hologram recording medium 130, the polymerization of the monomer M in the exposed portion of the photopolymer layer is completed.

  In addition, the hologram recording medium 130 is heated by the heat roller 158 on the rear side of the ultraviolet lamp 157. As a result, the refractive index modulation degree of the photopolymer layer increases, and the recorded image is fixed.

  Further, on the downstream side of the heat roller 158, the cutter driving mechanism is driven based on the control signal S12 supplied from the control computer 102, and the completed holographic stereogram is cut into a desired size by the cutter 160. And discharged to the outside.

  As described above, when a desired image is recorded on the hologram recording medium 130, the liquid is continuously supplied between the hologram recording medium 130 and the light introducing block 137B, and the liquid is always interposed therebetween. Then, the light introduction block 137B and the hologram recording medium 130 come into close contact with each other without generating a gap therebetween, so that the vibration of the hologram recording medium 130 is sufficiently suppressed.

  Further, since the liquid supplied between the hologram recording medium 130 and the light introduction block 137B performs index matching, the light introduction is performed when the reference light that has passed through the light introduction block 137B is incident on the hologram recording medium 130. There is no total reflection in the block 137B. Therefore, an excellent image quality holographic stereogram can be produced.

  As described above, if a liquid is interposed between the hologram recording medium 130 and the light introduction block 137B, the hologram recording medium 130 can be intermittently moved without moving the light introduction block 137B away from the hologram introduction medium 137B. You can feed.

  Further, here, since the hologram recording medium 130 and the light introduction block 137B are arranged in the air and the liquid is held by the surface tension, maintenance is easy.

  By the way, when performing reproduction by the edge lit method, an illumination light introduction block having the same optical characteristics as the light introduction block 137B is brought into contact with the holographic stereogram, and the surface of the hologram recording medium 130 is placed on the illumination light introduction block. If the illumination light is incident at the same angle as the incident angle of the reference light with respect to the light, the illumination light is diffracted by the interference fringes formed on the hologram recording medium 130, and the same diffracted light as the object light is generated. It will be obtained.

  Therefore, when producing a transmission type holographic stereogram by the edge lit method, the reference light must be incident on the hologram recording medium from the object light incident side through the reference light introduction block, The reference light introduction block is arranged between the cylindrical lens for collecting object light and the hologram recording medium. However, it is very difficult to dispose the reference light introduction block between the cylindrical lens and the hologram recording medium due to space limitations. In addition, the one-dimensional diffusion plate cannot be simply inserted.

  On the other hand, in the holographic stereogram printer device 103 having the printer head unit 150-3 as shown in FIG. 7, the edge-lit holographic stereogram is produced in a reflection type, so that the hologram The object light may be incident on one surface of the recording medium for recording 130 and the reference light may be incident on the other surface of the recording medium for hologram 130. Therefore, in the present embodiment, the cylindrical lens 143 and the one-dimensional diffusion plate 144 for focusing the object light are arranged on one side via the hologram recording medium 130, and the reference light introduction block 137B is arranged on the other side. The optical system can be configured very easily without being restricted by space.

  The holographic stereogram produced in the reflection type as described above can naturally reproduce a three-dimensional image in the reflection type. That is, as shown in FIG. 8, after the holographic stereogram 172 is pasted on the illumination light introduction block 171 via the liquid 170, the reproduction illumination light 173 is holographically transmitted from the end 171a of the illumination light introduction block 171. Incident toward the stereogram 172. Here, the holographic stereogram 172 is pasted on the surface 171 b far from the observer 174 among the surfaces of the illumination light introduction block 171.

  At this time, the reproduced image 176 generated by the diffracted light 175 diffracted from the holographic stereogram 172 in the reflection mode is observed by the observer 174. When the three-dimensional image is reproduced in this way, the reproduced image 176 is reproduced so that there is an object behind the illumination light introduction block 171 when viewed from the observer 174.

  As described above, the holographic stereogram produced by the reflection type can reproduce the three-dimensional image by the transmission type.

  That is, as shown in FIG. 9, the holographic stereogram 182 is attached to the illumination light introduction block 181 via the liquid 180, and then the reproduction illumination light 183 is holographically transmitted from the end 181a of the illumination light introduction block 181. Incident toward the stereogram 182. Here, the holographic stereogram 182 is pasted on the surface 181 c closer to the observer 184 among the surfaces of the illumination light introduction block 181.

  At this time, the reproduced image 186 generated by the diffracted light 185 diffracted from the holographic stereogram 182 in the transmission mode is observed by the observer 184. When a three-dimensional image is reproduced in this way, the reproduced image 186 is reproduced so that the object is in front of the reproduction method as shown in FIG. Therefore, by reproducing the three-dimensional image as shown in FIG. 9, the stereoscopic effect can be enhanced, and the display effect is enhanced.

  The shapes of the illumination light introduction blocks 171 and 181 are not necessarily rectangular parallelepiped, and the incident angles of the reproduction illumination lights 173 and 183 with respect to the holographic stereograms 172 and 182 are incident on the hologram recording medium 130 during recording. Any shape may be used as long as it matches the incident angle of the reference light.

  In the present embodiment, the wavelength of the laser beam used when producing the holographic stereogram is about 532 nm, and the angle θ between the reference beam and the object beam is about 75 °. The film thickness of the photosensitive portion of the hologram recording medium 130 is about 20 μm, and the refractive index thereof is around 1.5. Therefore, the wavelength selection width of this holographic stereogram is about 50 nm. For this reason, when reproducing this holographic stereogram, for example, a light emitting diode that emits light having a center wavelength of about 525 nm and a wavelength width of about 50 nm is suitable as the light source of the reproduction illumination lights 173 and 183. Since a light emitting diode has very high luminous efficiency, it can be used for a practical time even in a battery or the like. Therefore, it is possible to take the drive power source of the image reproducing apparatus from a battery or the like, thereby achieving downsizing and cost reduction.

  By the way, when reproducing a reflection type holographic stereogram, the wavelength selectivity is relatively high, and thus a reproduced image can be obtained usually using white light as reproduction illumination. On the other hand, when reproducing a holographic stereogram with a transmission type, wavelength selectivity is weaker than when reproducing a holographic stereogram with a reflection type, so that reproduction with white light is difficult. Accordingly, when a holographic stereogram is reproduced in a transmission type, it is preferable to use a light source with high color purity as a light source for reproduction. Specifically, if a light emitting diode that emits light with high color purity is used as a light source for reproduction illumination light, the weak wavelength selectivity is compensated for and a clear reproduction image can be obtained. In addition, since the light emitting diode is close to a point light source, it has an advantage that a reproduced image can be prevented from being blurred due to the spread of the light source, and has a light emitting efficiency that is very high and hardly emits heat.

  However, the light source of the illumination light for reproduction is not limited to the light emitting diode, and a reproduced image can be obtained in the same manner as long as it emits light with high color purity such as a semiconductor laser. Further, light with improved color purity using a wavelength selection filter, a narrow-band reflection mirror, or the like may be used as reproduction illumination light.

1-4 Modifications Although the embodiments of the image recording method and the image recording apparatus according to the present invention have been described above, it is needless to say that the present invention is not limited to the above-described embodiments. For example, the sponge 161 is used as the liquid supply means in the second embodiment, but the liquid supply means can be any liquid supply means that can supply liquid between the hologram recording medium 130 and the light introduction block 137B. The liquid may be applied onto the hologram recording medium 30 by a coating device using a die coater or a roll.

  In the above-described embodiment, the case where the present invention is applied to the production of a holographic stereogram having parallax information only in the horizontal direction has been described. The present invention can also be applied to the production of graphic stereograms and holographic stereograms having parallax information in both the horizontal and vertical directions.

  Furthermore, in the above-described embodiment, the case of producing a monochromatic holographic stereogram has been described. However, the present invention can be applied to the production of a color holographic stereogram in exactly the same manner. . When producing a holographic stereogram of color, for example, three lights that are the three primary colors of light may be used as recording light. Then, when reproducing a color holographic stereogram recorded using three lights which are the three primary colors of light, the image reproducing apparatus is provided with three light sources so as to emit the three primary colors of light. What is necessary is just to irradiate light to a holographic stereogram as illumination light for reproduction | regeneration simultaneously. However, when using a plurality of light sources in this way, it is necessary to assemble an optical system so that the light from each light source becomes parallel. When reproducing a color holographic stereogram, the wavelength selectivity is weak in the transmission type reproduction, so it is preferable to use a light source with high color purity for each light source. The stereogram can be reproduced clearly.

  Further, the structure of the light introduction block is not limited to the above-described embodiment. For example, object light that has been collected and entered the hologram recording medium passes through the hologram recording medium and enters the light introduction block, and the incident light is partially reflected on the opposite side surface of the light introduction block. Then, there is a possibility of returning to the hologram recording medium again. When this occurs, unnecessary interference fringes are formed in the exposed area to lower the contrast of the reproduced image, or light is applied to the hologram recording medium in the unexposed area before exposure. In this case, normal recording may not be performed. Therefore, for example, the light introduction block may be formed in a cylindrical shape, and the light absorbing member may be disposed in a hollow portion inside the cylinder. The light absorbing member is arranged at a position that does not hinder the introduction of the reference light. Thereby, unnecessary reflection inside the light introduction block can be eliminated.

  Here, it is preferable that air or the like is not interposed between the light introducing block and the light absorbing member, and it is further preferable that the refractive index of the light introducing block is close to the refractive index of the light absorbing member. Specifically, for example, it can be realized by using a black adhesive tape in which the refractive index of the adhesive is close to the refractive index of the light introduction block, or by enclosing clay or black liquid in the hollow portion of the light introduction block. is there.

  The same applies when the light introduction block is not a cylindrical shape but a square shape. That is, for example, by disposing black adhesive tape around the light introduction block at a position that does not prevent the introduction of the reference light, unnecessary reflection in the light introduction block can be prevented and image quality can be improved. it can.

  Furthermore, as shown in FIG. 10 or FIG. 23, the image recording apparatus may be arranged with a louver film 193 between the light introduction block 191 and the hologram recording medium 192. 10 illustrates an example in which the light introduction block 191 has a square shape, and FIG. 23 illustrates an example in which the light introduction block 191 has a cylindrical shape or a columnar shape.

  Here, the louver film 193 has a large number of louvers, which are physical blinds having an angle of the reference light incident angle with respect to the surface, formed in parallel at a predetermined interval, and light that enters perpendicularly to the surface. Has the property of not passing.

  When such a louver film 193 is optically disposed between the light introduction block 191 and the hologram recording medium 192 without passing air or the like, the hologram recording is performed at a steep angle through the light introduction block 191. The light irradiating the medium 192 passes through the louver film 193 and reaches the hologram recording medium 192, whereas the object light coming from the direction perpendicular to the surface of the louver film 193 passes through the hologram recording medium 192. After passing, it is absorbed by the louver film 193 and does not reach the light introduction block 191. Therefore, unnecessary reflection and the like are eliminated, and the image quality can be improved.

  In addition, the incident direction of the reference light in the holographic stereo printer device, the number, type, and combination of the lenses are not limited to those described above, and can be changed as appropriate.

2. Other Examples of Image Recording Method and Image Recording Device Other Embodiments of Image Recording Method and Image Recording Device According to the Present Invention, and Reproduction Method and Reproduction of Holographic Stereograms Produced by this Image Recording Method and Device The apparatus will be described.

2-1. Holographic Stereogram Production System First, a configuration example of a holographic stereogram production system for producing a holographic stereogram will be described. In the present embodiment, a holographic stereogram having parallax information in the horizontal direction by recording a plurality of strip-shaped element holograms on one recording medium will be described as an example. However, the present invention can be applied to a holographic stereogram having parallax information in the horizontal and vertical directions by recording a plurality of dot-shaped element holograms on a single recording medium. Needless to say.

  This holographic stereogram production system produces a so-called one-step holographic stereogram by using an edge-lit method in which a hologram recording medium on which interference fringes between object light and reference light are recorded is used as it is. As shown in FIG. 12, the system includes a data processing unit 201 that processes image data to be recorded, a control computer 202 that controls the entire system, and an optical system for producing a holographic stereogram. And a holographic stereogram printer device 203.

  The data processing unit 201 includes a plurality of image data D21 including parallax information supplied from a parallax image sequence photographing device 213 including a multi-lens camera, a mobile camera, and the like, and parallax generated by the image data generation computer 214. A parallax image sequence D23 is generated based on a plurality of image data D22 including information.

  Here, the plurality of pieces of image data D21 including the parallax information supplied from the parallax image sequence photographing device 213 is obtained by converting a real object in the horizontal direction by simultaneous photographing with a multi-lens camera or continuous photographing with a mobile camera, for example. It is image data for a plurality of images obtained by photographing from a plurality of different observation points.

  The plurality of pieces of image data D22 including the disparity information generated by the image data generation computer 214 is, for example, a plurality of CAD (Computer Aided Design) images or CG (Computer Graphics) generated by sequentially giving disparity in the horizontal direction. ) Image data such as an image.

  The data processing unit 201 performs predetermined image processing for holographic stereograms on the parallax image sequence D23 by the image processing computer 211. Then, the image data D24 subjected to the predetermined image processing is recorded in a storage device 212 such as a memory or a hard disk.

  Further, when the image is recorded on the hologram recording medium, the data processing unit 201 sequentially reads the data for each image from the image data D24 recorded in the storage device 212, and uses the image data D25 for control. Send to computer 202.

  On the other hand, the control computer 202 drives the holographic stereogram printer device 203 to record an image based on the image data D25 supplied from the data processing unit 201 in the hologram recording set in the holographic stereogram printer device 203. Recording is sequentially performed on the medium 230 as strip-shaped element holograms.

  At this time, the control computer 202 controls the shutter 232, the display device 241, the recording medium feeding mechanism, and the like provided in the holographic stereogram printer device 203, as will be described later. In other words, the control computer 202 sends a control signal S21 to the shutter 232 to control the opening and closing of the shutter 232, supplies the image data D25 to the display device 241, and supplies the display device 241 with an image based on the image data D25. And a control signal S22 is sent to the recording medium feeding mechanism to control the feeding operation of the hologram recording medium 230 by the recording medium feeding mechanism.

  The holographic stereogram printer device 203 will be described in detail with reference to FIG. 13A is a view of the entire optical system of the holographic stereogram printer device 203 as viewed from above, and FIG. 13B is an object light for the optical system of the holographic stereogram printer device 203. It is the figure which looked at the part from the horizontal direction.

  As shown in FIG. 13A, the holographic stereogram printer device 203 includes a laser light source 231 that emits laser light of a predetermined wavelength, and a shutter disposed on the optical axis of the laser light L21 from the laser light source 231. 232 and a half mirror 233. In the present embodiment, a laser light source 231 that emits laser light having a wavelength of about 532 nm is used.

  The shutter 232 is controlled by the control computer 202 and is closed when the hologram recording medium 230 is not exposed, and is opened when the hologram recording medium 230 is exposed. The half mirror 233 is for separating the laser light L22 that has passed through the shutter 232 into reference light and object light, and the light L23 reflected by the half mirror 233 becomes reference light. The light L24 that has passed through becomes object light.

  On the optical axis of the light L23 reflected by the half mirror 233, as an optical system for reference light, a cylindrical lens 234, a collimator lens 235 for making the reference light parallel, and parallel light from the collimator lens 235 Are totally arranged in this order.

  The light reflected by the half mirror 233 is first converted into divergent light by the cylindrical lens 234. Next, the collimator lens 235 converts the light into parallel light. Thereafter, the light is reflected by the total reflection mirror 236 and enters the hologram recording medium 230. Here, the hologram recording medium 230 is arranged so as to be in contact with the light introduction block 237 made of transparent glass via a matching liquid so that the element hologram is recorded by the edge-lit method. Then, the reference light enters the hologram recording medium 230 from the side where the light introduction block 237 is disposed.

  That is, the reference light is incident on the light introduction block 237 from the end portion 237a of the light introduction block 237 and is larger than the hologram recording medium 230 arranged so as to be in contact with the light introduction block 237 via the matching liquid. Incident at an incident angle. In the present embodiment, the angle θ formed by the optical axis of the reference light and the optical axis of the object light described later is set to about 75 °.

  On the other hand, on the optical axis of the light L24 transmitted through the half mirror 233, as shown in FIGS. 13A and 13B, the light transmitted from the half mirror 233 is reflected as an optical system for object light. A total reflection mirror 238, a spatial filter 239 combining a convex lens and a pinhole, a collimator lens 240 for converting object light into parallel light, a display device 241 for displaying an image to be recorded, and a display device 241. A diffusion plate 242 for diffusing the transmitted light and a cylindrical lens 243 for condensing the object light on the hologram recording medium 230 are arranged in this order, and a mask 244 in which a strip-shaped opening is formed. Is disposed immediately before the hologram recording medium 230.

  Then, the light L24 transmitted through the half mirror 233 is reflected by the total reflection mirror 238 and then is diffused from the point light source by the spatial filter 239. Next, the light is collimated by the collimator lens 240 and then enters the display device 241. Here, the display device 241 is a transmissive image display device including, for example, a liquid crystal display, and is controlled by the control computer 202 to display an image based on the image data D25 sent from the control computer 202. The light transmitted through the display device 241 is modulated according to the image displayed on the display device 241, diffused by the diffusion plate 242, and then enters the cylindrical lens 243. Here, the diffusion plate 242 contributes to improving the image quality of the produced holographic stereogram by slightly diffusing the transmitted light from the display device 241.

  Then, the light transmitted through the display device 241 is focused in the horizontal direction by the cylindrical lens 243, and the light transmitted through the strip-shaped opening of the mask 242 among the focused light is incident on the hologram recording medium 230 as object light. Incident. That is, in the holographic stereogram printer device 203, the projection light from the display device 241 enters the hologram recording medium 230 as strip-shaped object light. Here, the object light is incident on the hologram recording medium 230 from the side where the light introduction block 237 is not disposed so that the optical axis is substantially perpendicular to the surface of the hologram recording medium 230.

  In the optical system, the optical path length of the reference light reflected by the half mirror 233 and incident on the hologram recording medium 230 via the light introduction block 237 and the half mirror 233 are transmitted, and the hologram is transmitted via the display device 241. The optical path length of the object light incident on the recording medium 230 is approximately the same length. Thereby, the coherence between the reference light and the object light is increased, and a holographic stereogram capable of obtaining a clearer reproduced image can be produced.

  In the holographic stereogram printer device 203, an index matching liquid is dropped between the light introduction block 237 and the hologram recording medium 230 for index matching between the light introduction block 237 and the hologram recording medium 230. It is preferable to provide a mechanism. Therefore, in the present embodiment, a sponge infiltrated with the index matching liquid is disposed in the vicinity of the portion where the light introduction block 237 and the hologram recording medium 230 are in contact with each other so as to contact the hologram recording medium 230. Thus, each time the hologram recording medium 230 is sent, an index matching liquid is supplied from the sponge between the light introduction block 237 and the hologram recording medium 230, and the light introduction block 237 and the hologram recording medium 230 are Index matching will be achieved.

  By the way, when producing a transmissive holographic stereogram, both object light and reference light are made incident on one surface of a hologram recording medium. Therefore, when producing a transmission-type holographic stereogram by the edge-lit method, the reference light must be incident on the hologram recording medium through the light introduction block from the object light incident side, A light introduction block is disposed between the cylindrical lens for collecting object light and the hologram recording medium. However, it is very difficult to dispose the light introduction block between the cylindrical lens and the hologram recording medium due to space limitations.

  On the other hand, when an edge-lit holographic stereogram is manufactured as a reflection type like the holographic stereogram printer device 203, object light is incident on one surface of the hologram recording medium 230. In addition, the reference light may be incident on the other surface of the hologram recording medium 230. Therefore, in the present embodiment, a cylindrical lens 243 for focusing object light may be disposed on one side via the hologram recording medium 230, and a light introduction block 237 may be disposed on the other side. Therefore, the optical system can be configured very easily without being restricted.

  The holographic stereogram printer apparatus 203 includes a recording medium feeding mechanism 250 that can intermittently feed the hologram recording medium 230 by one element hologram under the control of the control computer 202. As will be described later, the recording medium feeding mechanism 250 is capable of intermittently feeding a film-like hologram recording medium based on a control signal from the control computer 202. When the holographic stereogram printer device 203 produces a holographic stereogram, each image data of the parallax image sequence is recorded on the hologram recording medium 230 set in the recording medium feeding mechanism 250 in a predetermined state. Are sequentially recorded as strip-shaped element holograms.

  Here, the hologram recording medium 230 used in the holographic stereogram production system will be described in detail with reference to FIGS.

  In the hologram recording medium 230, as shown in FIG. 14, a photopolymer layer 230b made of a photopolymerizable photopolymer is formed on a film base material 230a formed in a tape shape, and the photopolymer layer 230b This is a so-called film-coated type recording medium formed by attaching a cover sheet 230c to the surface. In the present embodiment, the product name “OMNI-DEX” manufactured by DuPont Co., Ltd. was used for the photopolymer layer 230b serving as the photosensitive portion, and the film thickness was about 20 μm.

In the photopolymerization type photopolymer, in the initial state, as shown in FIG. 15A, the monomers M are uniformly dispersed in the matrix polymer. On the other hand, as shown in FIG. 15B, when the light LA having a power of about 10 to 400 mJ / cm ² is irradiated, the monomer M is polymerized in the exposed portion. Then, as the polymer is formed, the monomer M moves from the surroundings, and the concentration of the monomer M changes depending on the location, thereby causing refractive index modulation. Thereafter, as shown in FIG. 15C, the polymerization of the monomer M is completed by irradiating the entire surface with ultraviolet light or visible light LB having a power of about 1000 mJ / cm ² . Thus, since the refractive index of the photopolymerization type photopolymer changes in accordance with the incident light, interference fringes caused by interference between the reference light and the object light can be recorded as a change in the refractive index.

  The hologram recording medium 230 using such a photopolymerization type photopolymer does not need to be specially developed after exposure. Therefore, the configuration of the holographic stereogram printer device 203 according to the present embodiment using the hologram recording medium 230 using the photopolymerization type photopolymer for the photosensitive portion can be simplified.

  Next, the recording medium feeding mechanism 250 will be described in detail with reference to FIG. Here, FIG. 16 is an enlarged view of the recording medium feeding mechanism 250 of the holographic stereogram printer device 203.

  As shown in FIG. 16, the recording medium feeding mechanism 250 includes a roller 251 and an intermittent feeding roller 252, and the hologram recording medium 230 is stored in the film cartridge 253 while being wound around the roller 251. Has been. The recording medium feeding mechanism 250 rotatably supports the roller 251 in the film cartridge 253 loaded at a predetermined position with a predetermined torque while rotating the hologram recording medium 230 drawn out from the film cartridge 253. The roller 251 and the intermittent feed roller 252 can be held. At this time, the recording medium feeding mechanism 250 holds the hologram recording medium 230 so that the surface of the hologram recording medium 230 is substantially perpendicular to the object light between the roller 251 and the intermittent feeding roller 252. . Further, the roller 251 and the intermittent feed roller 252 are urged away from each other by a torsion coil spring, and thus loaded so as to be spanned between the roller 251 and the intermittent feed roller 252. A predetermined tension is applied to the hologram recording medium 230.

  The intermittent feeding roller 252 of the recording medium feeding mechanism 250 is connected to a stepping motor (not shown) so that it can freely rotate in the direction indicated by the arrow f in FIG. 16 based on the rotational force from the stepping motor. Has been made. This stepping motor sequentially rotates the intermittent feed roller 252 by a predetermined angle corresponding to one element hologram every time exposure of one image is completed, based on a control signal S22 supplied from the control computer 202. As a result, the hologram recording medium 230 is sent by one element hologram for each exposure of one image.

  In addition, an ultraviolet lamp 254 is disposed along the path of the hologram recording medium 230 in the subsequent stage of the intermittent feeding roller 252. The ultraviolet lamp 254 is for completing the polymerization of the monomer M of the exposed hologram recording medium 230, and has a predetermined power with respect to the hologram recording medium 230 sent by the intermittent feeding roller 252. Ultraviolet rays UV can be irradiated.

  Further, in the path of the hologram recording medium 230, a heat roller 255 that is rotatably supported, a pair of discharge feed rollers 256 and 257, and a cutter 258 are sequentially disposed in the subsequent stage of the ultraviolet lamp 254. ing.

  Here, the discharge feed rollers 256 and 257 feed the hologram recording medium 230 so that the cover sheet 230c side of the hologram recording medium 230 is wound in a state of being in close contact with the peripheral side surface of the heat roller 255 over a half circumference. Has been made. The discharge feed rollers 256 and 257 are connected to a stepping motor (not shown) and can rotate based on the rotational force from the stepping motor. Based on the control signal S22 supplied from the control computer 202, this stepping motor is synchronized with the rotation of the intermittent feeding roller 252 by a predetermined angle corresponding to one element hologram every time exposure of one image is completed. The discharge feed rollers 256 and 257 are sequentially rotated. As a result, the hologram recording medium 230 is sent in a state of being in close contact with the peripheral side surface of the heat roller 255 without being loosened between the intermittent feed roller 252 and the discharge feed rollers 256 and 257.

  The heat roller 255 includes a heating means such as a heater inside, and the heat generating means can maintain a temperature of about 120 ° C. on the peripheral side surface. The heat roller 255 heats the sent photopolymer layer 230b of the hologram recording medium 230 through the cover sheet 230c, thereby increasing the refractive index modulation degree of the photopolymer layer 230b, and recording the hologram. The recorded image is fixed on the medium 230. For this reason, the outer diameter of the heat roller 255 is selected so that it takes time to fix the recorded image from when the hologram recording medium 230 starts to come into contact with the peripheral side surface until the heat roller 255 leaves.

  Further, the cutter 258 includes a cutter driving mechanism (not shown), and the hologram recording medium 230 that is sent can be cut by driving the cutter driving mechanism. This cutter driving mechanism is configured to record all the images based on the image data of the parallax image sequence on the hologram recording medium 230 on the basis of the control signal S22 supplied from the control computer 202, and then record the hologram recording medium. The cutter 258 is driven at the stage where all the portions where the 230 images are recorded are discharged to the outside of the cutter 258. As a result, the portion where the image data is recorded is separated from the other portions and is discharged to the outside as a single holographic stereogram.

  Next, an operation when producing a holographic stereogram with the holographic stereogram producing system having the above configuration will be described.

  When producing the holographic stereogram, the control computer 202 drives the display device 241 based on the image data D25 supplied from the data processing unit 201 and causes the display device 241 to display an image. Thereafter, the control computer 202 sends a control signal S21 to the shutter 232, opens the shutter 232 for a predetermined time, and exposes the hologram recording medium 230. At this time, out of the laser light L22 emitted from the laser light source 231 and transmitted through the shutter 232, the light L23 reflected by the half mirror 233 enters the hologram recording medium 230 via the light introduction block 237 as reference light. . Further, the light L24 transmitted through the half mirror 233 becomes projection light on which the image displayed on the display device 241 is projected, and the projection light enters the hologram recording medium 230 as object light. Thereby, one image displayed on the display device 241 is recorded as a strip-shaped element hologram on the hologram recording medium 230.

  When the recording of one image on the hologram recording medium 230 is completed, the control computer 202 then causes the stepping motor connected to the intermittent feed roller 252 and the stepping connected to the discharge feed rollers 256 and 257 to move. The control signal S22 is sent to the motor to drive them, thereby causing the hologram recording medium 230 to be sent by one element hologram.

  Next, the control computer 202 drives the display device 241 based on the next image data D25 supplied from the data processing unit 201 and causes the display device 241 to display the next image. Thereafter, the same operation as described above is sequentially repeated, whereby each image based on each image data D25 supplied from the data processing unit 201 is sequentially recorded on the hologram recording medium 230 as a strip-shaped element hologram.

  That is, in this holographic stereogram production system, images based on the image data recorded in the storage device 212 are sequentially displayed on the display device 241, the shutter 232 is opened for each image, and each image has a strip shape. Are sequentially recorded on the hologram recording medium 230. At this time, since the hologram recording medium 230 is sent by one element hologram for each image, the element holograms are continuously arranged in the horizontal direction. Thereby, a plurality of images including the parallax information in the horizontal direction are recorded on the hologram recording medium 230 as a plurality of element holograms continuous in the horizontal direction, and a holographic stereogram having a parallax in the horizontal direction is obtained.

  Thereafter, the hologram recording medium 230 on which the element hologram is recorded as described above is irradiated with ultraviolet rays UV from the ultraviolet lamp 254. Thereby, the polymerization of the monomer M is completed. Next, the hologram recording medium 230 is heated by the heat roller 255, whereby the recorded image is fixed.

  When all the portions where the images are recorded are sent to the outside, the control computer 202 supplies a control signal S22 to the cutter driving mechanism to drive the cutter driving mechanism. As a result, the portion of the hologram recording medium 230 on which the image has been recorded is cut off by the cutter 258 and discharged as a single holographic stereogram.

  Through the above steps, an edge-lit reflective holographic stereogram having lateral parallax is completed.

2-2 Reproduction of holographic stereogram Next, reproduction of the holographic stereogram produced as described above will be described.

  When a three-dimensional image is reproduced from the edge-lit holographic stereogram produced as described above in a reflective manner, the light introduction block 261 is subjected to holography via an index matching liquid 260 as shown in FIG. After the graphic stereogram 262 is pasted, the reproduction illumination light 263 enters from the end 261a of the light introduction block 261 toward the holographic stereogram 262. Here, the holographic stereogram 262 is pasted on the surface 261 b far from the observer 264 among the surfaces of the light introduction block 261. At this time, the reproduced image 266 generated by the diffracted light 265 diffracted from the holographic stereogram 262 in the reflection mode is observed by the observer 264. However, when the three-dimensional image is reproduced in the reflection type in this way, the reproduced image 266 is reproduced such that an object is present behind the light introducing block 261 when viewed from the observer 264.

  On the other hand, in the present invention, a three-dimensional image from an edge-lit reflective holographic stereogram produced as described above is reproduced in a transmission type. That is, in the reproduction method according to the present invention, as shown in FIG. 18, the holographic stereogram 272 is pasted on the light introduction block 271 via the index matching liquid 270 and the reproduction illumination light 273 is applied to the light introduction block. Incident light enters the holographic stereogram 272 from the end 271a of the 271. Here, the holographic stereogram 272 is pasted on the surface 271 c closer to the observer 274 among the surfaces of the light introduction block 271.

  At this time, the reproduced image 276 generated by the diffracted light 275 diffracted from the holographic stereogram 272 in the transmission mode is observed by the observer 274. Thus, when a three-dimensional image is reproduced, the reproduced image 276 is reproduced so that the object is in front of the reproduction method as shown in FIG. Therefore, by reproducing the three-dimensional image as shown in FIG. 18, the stereoscopic effect can be enhanced and the display effect is enhanced.

  A configuration example of an image reproducing apparatus that reproduces a transmission type three-dimensional image in this way will be described with reference to FIG.

  This image reproduction device is an edge-lit image reproduction device, and includes a light introduction block 281 to which a holographic stereogram 280 is attached, and a light source 283 that irradiates reproduction illumination light 282 from an end surface 281a of the light introduction block 281. It has. Here, as described above, the holographic stereogram 280 to be reproduced is obtained by making the object light incident on one surface of the hologram recording medium and the reference light incident on the other surface of the hologram recording medium, as described above. 3 is an edge-lit holographic stereogram in which three-dimensional image information is recorded.

  The light introduction block 281 is for introducing the reproduction illumination light 282 into the holographic stereogram 280, and is a rectangular parallelepiped block made of transparent glass or the like similar to that used at the time of recording. The holographic stereogram 280 to be reproduced is attached to the light introduction block 281 via an index matching liquid. Here, the holographic stereogram 280 is affixed to the surface 281 b closer to the observer 284 among the surfaces of the light introduction block 281.

  The shape of the light introduction block 281 does not need to be a rectangular parallelepiped, and may be any shape as long as the reproduction illumination light 282 is incident on the holographic stereogram 280 at a predetermined angle. . That is, if the incident angle of the reference light incident on the hologram recording medium at the time of recording coincides with the incident angle of the reproduction illumination light 282 with respect to the holographic stereogram 280, what is the light introduction block 281? It may be a simple shape.

  On the other hand, the light source 283 includes a light emitting diode, and is arranged so as to irradiate the holographic stereogram 280 with the reproduction illumination light 282. Here, since the light emitting diode used as the light source 283 of the reproduction illumination light 282 has a very high light emission efficiency, even a battery or the like can be used for a sufficiently practical time. Therefore, this image reproducing apparatus can take drive power from a battery or the like, thereby achieving downsizing and cost reduction.

  In the image reproducing apparatus having the above-described configuration, by integrating the light source 283 of the reproduction illumination light 282 and the light introducing block 281, the optical system can be simplified and the size can be reduced. In addition, by integrating the light source 283 of the reproduction illumination light 282 and the light introduction block 281, the incident angle of the reproduction illumination light 282 with respect to the holographic stereogram 280 can always be set to the optimum angle, and the image quality is always high. A reconstructed image 285 can be obtained.

  Note that, as described above, in this embodiment, the wavelength of the laser light used when producing the holographic stereogram is about 532 nm, and the angle θ formed by the optical axis of the reference light and the optical axis of the object light. Is about 75 °. Further, the film thickness of the photosensitive portion of the hologram recording medium 230 is about 20 μm, and the refractive index thereof is about 1.5. Therefore, the wavelength selection width of this holographic stereogram is about 50 nm. Therefore, in the image reproducing apparatus, as the light source 283, for example, a light emitting diode that emits light having a center wavelength of about 525 nm and a wavelength width of about 50 nm is preferable.

  When a three-dimensional image is reproduced from the holographic stereogram 280 by the image reproducing device, the holographic stereogram 280 is attached to the light introduction block 281 via an index matching liquid. At this time, the holographic stereogram 280 is arranged on the viewer 284 side. The holographic stereogram 280 is irradiated with reproduction illumination light 282 from the light source 283 via the light introduction block 281. At this time, a reproduction image 285 is generated by the diffracted light 286 diffracted when the reproduction illumination light 282 passes through the holographic stereogram 280. The reproduced image 285 is reproduced so that the object is relatively in front, and becomes a very three-dimensional image.

  By the way, when reproducing a reflection type holographic stereogram, the wavelength selectivity is relatively high, and thus a reproduced image can be obtained usually using white light as reproduction illumination. On the other hand, when reproducing a holographic stereogram with a transmission type, wavelength selectivity is weaker than when reproducing a holographic stereogram with a reflection type, so that reproduction with white light is difficult. Accordingly, when a holographic stereogram is reproduced in a transmission type, it is preferable to use a light source with high color purity as a light source for reproduction. Therefore, in the image reproducing device, it is preferable to use a light emitting diode that emits light with high color purity as the light source 283 of the reproduction illumination light 282. Thereby, the weak wavelength selectivity is compensated, and a clear reproduced image 285 can be obtained. In addition, since the light emitting diode is close to a point light source, it has an advantage that blur of the reproduced image 285 due to the spread of the light source can be prevented, and an advantage that the light emission efficiency is very high and hardly generates heat.

  However, the light source 283 of the reproduction illumination light 282 is not limited to a light emitting diode, and a reproduction image 285 can be obtained in the same manner as long as it emits light with high color purity such as a semiconductor laser. Further, light with improved color purity using a wavelength selection filter, a narrow band reflection mirror, or the like may be used as the reproduction illumination light 282.

  In the above description, the monochromatic holographic stereogram has been described. However, the present invention can be applied to a color holographic stereogram in exactly the same manner. When producing a holographic stereogram of color, for example, three lights that are the three primary colors of light may be used as recording light. Then, when reproducing a color holographic stereogram recorded using three lights which are the three primary colors of light, the image reproducing apparatus is provided with three light sources so as to emit the three primary colors of light. What is necessary is just to irradiate light to a holographic stereogram as illumination light for reproduction | regeneration simultaneously. However, when using a plurality of light sources in this way, it is necessary to assemble an optical system so that the light from each light source becomes parallel. When reproducing a color holographic stereogram, the wavelength selectivity is weak in the transmission type reproduction, so it is preferable to use a light source with high color purity for each light source. The stereogram can be reproduced clearly.

It is a schematic diagram which shows the example of 1 structure of a holographic stereogram printer system. It is a schematic diagram which shows an example of the optical system of a holographic stereogram printer apparatus. It is a schematic diagram which shows the mode of the total reflection of the reference light in the interface of the hologram recording medium. It is a schematic diagram which shows a mode that reference light is prevented from reentering the hologram recording medium by a louver film. FIG. 3 is a schematic diagram showing a configuration example in the vicinity of a printer head portion of a holographic stereogram printer apparatus of a type in which a hologram recording medium and a light introducing block are closely attached. It is a schematic diagram which shows the other structural example of the vicinity of the printer head part about the holographic stereogram printer apparatus of the type which closely_contact | adheres the hologram recording medium and the light introduction block. FIG. 3 is a schematic diagram showing a configuration example in the vicinity of a printer head portion of a holographic stereogram printer device of a type in which a liquid is interposed between a hologram recording medium and a light introducing block. It is a schematic diagram which shows the reproduction | regeneration method by the reflection type of a holographic stereogram. It is a schematic diagram which shows the reproduction | regeneration method by the transmission type of a holographic stereogram. It is sectional drawing which shows the example which distribute | arranged the louver film between the light introduction block and the recording medium for holograms. It is sectional drawing which shows the example which distribute | arranged the louver film between the light introduction block and the recording medium for holograms. It is a schematic diagram which shows one structural example of a holographic stereogram production system. It is a schematic diagram which shows an example of the optical system of a holographic stereogram printer apparatus. It is sectional drawing which shows an example of the recording medium for holograms. It is a schematic diagram which shows the photosensitive process of a photopolymerization type photopolymer. FIG. 4 is a schematic diagram illustrating a configuration example of a recording medium feeding mechanism. It is a schematic diagram which shows the reproduction | regeneration method by the reflection type of a holographic stereogram. It is a schematic diagram which shows the reproduction | regeneration method by the transmission type of a holographic stereogram. It is a schematic diagram which shows one structural example of the image reproduction apparatus to which this invention is applied. It is a schematic diagram which shows the preparation methods of a holographic stereogram.

Explanation of symbols

130 hologram recording medium, 137 light introducing block, 144 one-dimensional diffusion plate, 145 louver film, 150 printer head

Claims (12)

The object light is collected and incident on one surface of the hologram recording medium, the light introduction block is optically contacted with the other surface, and the reference light is incident from the end of the light introduction block. Each image based on each image data of a parallax image sequence is recorded as a strip-shaped or dot-shaped element hologram on the hologram recording medium by causing light and the reference light to interfere with each other,
An image recording method, wherein after recording the element hologram, the hologram recording medium is moved with respect to the light introduction block for each element hologram to produce an edge-lit holographic stereogram. A light introduction block that optically contacts at least one surface of the hologram recording medium;
The object light is collected and incident on the other surface of the hologram recording medium facing the surface where the light introduction block contacts, and the reference light is incident through the light introduction block, and the object light and the An edge-lit holographic stereogram is produced by sequentially recording each image based on each image data of the parallax image sequence on the hologram recording medium as a strip-like or dot-like element hologram on the hologram recording medium. An image recording apparatus.   The image recording apparatus according to claim 2, wherein an optical element that transmits reference light and shields object light is disposed between the light introduction block and the hologram recording medium.   The light introduction block includes a light absorption member, and the light absorption member does not cause unnecessary reflection inside the light introduction block after the object light and the reference light incident on the light introduction block reach the hologram recording medium. The image recording apparatus according to claim 2, wherein the image recording apparatus is configured as described above.   3. The image recording apparatus according to claim 2, wherein a film-like medium is used as the hologram recording medium, and an image is recorded in a state where the hologram recording medium and the light introducing block are in direct contact with each other.   3. The image recording apparatus according to claim 2, wherein the light introduction block is formed in a substantially cylindrical shape and is rotated with the movement of the hologram recording medium.   7. The image recording apparatus according to claim 6, wherein the light introducing block is rotated while keeping the hologram recording medium in contact with the light introducing block.   The light introduction block has a hollow portion inside, and a light absorbing member is arranged in the hollow portion, and the object light and the reference light incident on the light introduction block reach the hologram recording medium by the light absorption member. 7. The image recording apparatus according to claim 6, wherein unnecessary reflection is prevented from occurring inside the light introducing block after the operation.   The image recording apparatus according to claim 2, further comprising a pressing unit that presses the light introduction block against the hologram recording medium.   As the hologram recording medium, a hologram recording medium having a cover sheet for protecting the photosensitive portion is used, and the cover sheet is peeled off from the hologram recording medium before the hologram recording medium is brought into contact with the light introducing block. The image recording apparatus according to claim 2, further comprising a removing unit.   13. The image recording apparatus according to claim 12, further comprising a cleaning unit that removes dirt on the light introduction block. 3. The image recording apparatus according to claim 2, wherein a one-dimensional diffusion plate is disposed in the vicinity of the hologram recording medium and on the side on which object light is incident.

Images