Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
• • G—PHYSICS
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  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0402—Recording geometries or arrangements
  • G03H1/0404—In-line recording arrangement
• • G—PHYSICS
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  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0465—Particular recording light; Beam shape or geometry
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0476—Holographic printer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
  • G03H1/0808—Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
  • G03H1/30—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique discrete holograms only
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
  • G03H1/024—Hologram nature or properties
  • G03H1/0248—Volume holograms
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2249—Holobject properties
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0402—Recording geometries or arrangements
  • G03H2001/0413—Recording geometries or arrangements for recording transmission holograms
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0402—Recording geometries or arrangements
  • G03H2001/0415—Recording geometries or arrangements for recording reflection holograms
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0476—Holographic printer
  • G03H2001/048—Parallel printer, i.e. a fringe pattern is reproduced
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0476—Holographic printer
  • G03H2001/0482—Interference based printer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0476—Holographic printer
  • G03H2001/0484—Arranged to produce three-dimensional fringe pattern
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms
  • G03H1/0486—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations
  • G03H2001/0491—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations by monitoring the hologram formation, e.g. via a feed-back loop
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2202—Reconstruction geometries or arrangements
  • G03H2001/2223—Particular relationship between light source, hologram and observer
  • G03H2001/2234—Transmission reconstruction
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2249—Holobject properties
  • G03H2001/2263—Multicoloured holobject
  • G03H2001/2271—RGB holobject
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
  • G03H1/2286—Particular reconstruction light ; Beam properties
  • G03H2001/2289—Particular reconstruction light ; Beam properties when reconstruction wavelength differs form recording wavelength
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
  • G03H1/30—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique discrete holograms only
  • G03H2001/303—Interleaved sub-holograms, e.g. three RGB sub-holograms having interleaved pixels for reconstructing coloured holobject
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2210/00—Object characteristics
  • G03H2210/20—2D object
  • G03H2210/22—2D SLM object wherein the object beam is formed of the light modulated by the SLM
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2210/00—Object characteristics
  • G03H2210/30—3D object
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2222/00—Light sources or light beam properties
  • G03H2222/10—Spectral composition
  • G03H2222/17—White light
  • G03H2222/18—RGB trichrome light
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2225/00—Active addressable light modulator
  • G03H2225/30—Modulation
  • G03H2225/36—Polarisation
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2227/00—Mechanical components or mechanical aspects not otherwise provided for
  • G03H2227/05—Support holding the holographic record
  • G03H2227/06—Support including light source
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2250/00—Laminate comprising a hologram layer
  • G03H2250/42—Reflective layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H2270/00—Substrate bearing the hologram
  • G03H2270/20—Shape
  • G03H2270/23—Ribbon shaped, e.g. holographic foil

Definitions

• the present invention relates to a hologram creating apparatus and method for creating a hologram for reproducing a three-dimensional image.
• pseudo 3D display As a means of outputting 3D image information handled by a computer, a pseudo 3D display on a display was generally used. In this pseudo three-dimensional display, it is possible to observe the displayed image three-dimensionally by freely moving the image displayed on the display. However, pseudo 3D display does not truly display a 3D image, so it is difficult to sufficiently express 3D image information.
• a model creation device (also called a solid creator) that automatically creates a model from three-dimensional image information is practical.
• this model making device it is necessary to provide a model making device in a remote place when sending 3D image information to a remote place such as overseas and evaluating it at that remote place.
• it is necessary to actually make a model using the model making device and it cannot be said to be an easy output means in terms of economy and time.
• the method of outputting three-dimensional image information using a model creation device is enormous in cost and is not practical.
• output of three-dimensional image information using holography can be considered.
• output of three-dimensional image information using holography is performed by irradiating a reference medium onto a recording medium, that is, a hologram on which an interference pattern is recorded due to interference between object light carrying image information and reference light. It is done by doing.
• the method of creating a hologram by interfering the object light and the reference light can only record information on an actual object, and cannot record 3D image information handled by a computer. Also, with this method, even if it is a real object, if the object is too large, the information cannot be recorded. In addition, this method is not suitable for people who are in the so-called Clie night, who are trying to create a picture by adding characters such as a title to the video or adding various video effects. Furthermore, this method makes it difficult to create larger holograms that can be used for street advertising.
• an interference pattern that would be generated by interference between information light and reference light obtained by performing Fourier transform on object information in a space to be displayed three-dimensionally can be calculated using a computer-based computer. Calculate using, and draw the pattern with a normal printer, etc., and photograph the drawn pattern with a camera, etc., to reduce the size to correspond to the actual size of the display object and to be determined by the wavelength, The reduced pattern is printed in the form of irregularities or dots to create a hologram.
• the conventional method of creating holograms by computer-generated holography has many steps, and is not suitable for easily outputting 3D image information handled by a computer.
• the interference pattern is two-dimensionally recorded in the conventional method, Bragg diffraction cannot be used effectively, so that it is difficult to improve the diffraction efficiency and the expressiveness of the three-dimensional image display. There is a point.
• an optical system for irradiating the recording medium with light modulated by a two-dimensional image and an optical system for irradiating the recording medium with reference light are separately required. There is a problem that the mechanism becomes complicated. Disclosure of the invention
• the present invention has been made in view of such a problem, and a first object of the present invention is to generate a three-dimensional image without being restricted by the size of the three-dimensional image to be reproduced, the size of the hologram, and the reference light at the time of reproduction. It is an object of the present invention to provide a hologram creating apparatus and a hologram creating method capable of easily creating a hologram to be reproduced.
• a second object of the present invention is to provide a hologram creating apparatus and method capable of creating a three-dimensional hologram in addition to the first object.
• a third object of the present invention is to provide a hologram creating apparatus and method capable of creating a hologram with a simple mechanism in addition to the first object.
• the hologram forming apparatus is configured to generate a reproduction light corresponding to a desired three-dimensional image when a recording medium on which information is recorded by using holography is irradiated with reference light for reproduction.
• a hologram forming apparatus that records an interference pattern and creates a hologram for reproducing a three-dimensional image, and irradiates a part of a recording medium with a plurality of recording light beams that form a part of the interference pattern. And one of the interference patterns And a position changing means for changing a relative positional relationship between the head and a recording medium.
• a part of the interference pattern is formed on a part of the recording medium by the head while the relative positional relationship between the head and the recording medium is changed by the position changing means.
• a hologram is created by irradiating a plurality of recording light beams and performing a plurality of operations of recording a part of the interference pattern.
• the hologram forming method of the present invention is a method for generating a reproduction light corresponding to a desired three-dimensional image when a recording medium on which information is recorded using holography is irradiated with reproduction reference light.
• the operation of recording a part of the interference pattern is performed a plurality of times while changing the relative positional relationship between the recording medium and the recording light beam, thereby creating a hologram.
• FIG. 1 is a perspective view showing a configuration of a hologram forming apparatus according to a first embodiment of the present invention.
• FIG. 2 is a partially cutaway front view of the hologram forming apparatus shown in FIG.
• FIG. 3 is a side view of the hologram creating apparatus shown in FIG.
• FIG. 4 is an explanatory diagram showing the configuration of the head in FIG.
• FIG. 5 is a cross-sectional view showing an example of the configuration of the recording medium in FIG.
• FIG. 6 is a block diagram showing a circuit configuration of the hologram creating device according to the first embodiment of the present invention.
• FIG. 7 is a block diagram showing a configuration of the detection circuit in FIG.
• FIG. 8 is a flowchart showing the operation of the hologram creating device according to the first embodiment of the present invention.
• FIG. 4 is an explanatory diagram showing a method and a method of reproducing a three-dimensional image from a created hologram.
• FIGS. 10A to 10D are explanatory diagrams showing the operation of the light source device and the spatial light modulator in FIG.
• FIG. 11 is an explanatory diagram for explaining polarized light used in the first embodiment of the present invention.
• FIG. 12 is an explanatory diagram showing a state of light near the recording medium in FIG.
• FIG. 13 is an explanatory diagram showing a state of light in the vicinity of the recording medium in FIG.
• FIG. 14 is an explanatory diagram showing an example of an array of partial holograms for each of R, G, and B formed by the hologram forming apparatus according to the first embodiment of the present invention.
• FIG. 15 is a perspective view showing an example of a reproducing device for reproducing a three-dimensional image from a hologram created by the hologram creating device according to the first embodiment of the present invention.
• FIG. 16 is an explanatory diagram showing an example of another form of hologram that can be created by the hologram creating apparatus according to the first embodiment of the present invention.
• FIG. 17 is an explanatory diagram showing an example of a reproducing apparatus for reproducing a three-dimensional image from the hologram shown in FIG.
• FIG. 18 is a perspective view showing a configuration of a hologram forming apparatus according to the second embodiment of the present invention.
• FIG. 19 is an explanatory diagram showing the configuration of the head in FIG.
• FIG. 20 is an explanatory diagram showing a state of a partial hologram formed in a recording medium by the hologram creating device according to the second embodiment of the present invention.
• FIG. 21 is a side view of a hologram forming apparatus according to a third embodiment of the present invention.
• FIG. 22 is an explanatory diagram showing the configuration of the head in FIG. 21. BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 is a perspective view showing a configuration of a hologram creating apparatus according to a first embodiment of the present invention.
• FIG. 2 is a partially cutaway front view of the hologram creating apparatus shown in FIG.
• FIG. 2 is a side view of the hologram creating apparatus shown in FIG.
• the hologram forming apparatus according to the present embodiment transports a sheet-shaped recording medium 1 on which information is recorded using holography from a supply unit (not shown) to a discharge unit (not shown).
• a plate-shaped guide portion 5 arranged in parallel in the axial direction of the conveying rollers 2 a, 2 b; 3 a, 3 b, and the recording medium 1.
• the recording medium 1 is arranged so as to face the guide section 5 and irradiates a part of the recording medium 1 with two recording light beams which form a part of an interference pattern to be recorded on the recording medium 1, thereby forming an interference pattern. It has a head 10 for recording part.
• the hologram forming apparatus further includes a column-shaped ultraviolet lamp 6 disposed between the transport rollers 3 a and 3 b and the transport rollers 4 a and 4 b at a position above the recording medium 1.
• a cylindrical pinch roller 7 which is disposed below the lamp 6 and holds the recording medium 1 by the ultraviolet lamp 6, the ultraviolet lamp 6, the pinch roller 7, and the transport rollers 4 a, 4 b, a cylindrical heat roller 8 disposed at a position above the recording medium 1, and a cylindrical pinch roller 9 for holding the recording medium 1 by the heat roller 8. ing.
• the ultraviolet lamp 6 irradiates the recording medium 1 with ultraviolet light, and the heat roller 8 applies heat to the recording medium 1, and these correspond to fixing means in the present invention.
• the hologram producing apparatus further comprises two guide shafts 11a, 11b arranged in parallel with the transport rollers 2a, 2b; 3a, 3b in the axial direction above the head 10.
• a movable portion 12 guided by the guide shafts 11a and 11b and movable along the guide shafts 11a and lib is provided.
• the head 10 is joined to the lower end surface of the movable part 12 so as to move together with the movable part 12.
• the hologram creation device further includes a movable section 12 and a guide shaft 11 a, lib It is equipped with a voice coil module (hereinafter referred to as VCM) 13 for moving along.
• VCM 13 has a VCM yoke 14 disposed above the guide shafts 11a and 11b in parallel with the guide shafts 11a and lib, and a VCM yoke 14 disposed above the VCM yoke 14.
• a VCM block 15 which is arranged parallel to the CM block 14 at a predetermined distance from each other, and is connected to the VCM yoke 14 at the end, and is fixed to the lower surface of the VCM yoke 15
• a voice coil 17 arranged around the VCM yoke 14 at a predetermined distance from the outer peripheral surface of the VCM yoke 14.
• the voice coil 17 is joined to the upper end surface of the movable part 12.
• the VCM shock 15 and the VCM magnet 16 are omitted.
• the hologram creating apparatus further includes an R light source device 21 R for emitting red (hereinafter, referred to as R) coherent laser light and a green (hereinafter, referred to as G) coherent laser beam.
• R red
• G green
• G green
• G coherent laser beam
• G light source device 21 G that emits light
• B light source device 21 B that emits blue (hereinafter, referred to as B) coherent laser light
• each light source device 21 R, 21 G, 2 1 Collimator lenses 22 R, 22 G, and 22 B that convert the laser light emitted from B into parallel light beams, a dichroic prism into which light passing through the collimator lens 22 R enters, and a collimator.
• It is provided with a dichroic prism 23 G on which light passing through the lens 22 G is incident, and a reflecting prism 23 B on which light passing through the collimating lens 22 B is incident.
• the reflecting prism 23B reflects the B light that has passed through the collimator lens 22B.
• the B light reflected by the reflecting prism 23B is incident on the dichroic prism 23G from the side.
• the dichroic prism 23 G reflects the G light passing through the collimator lens 22 G and transmits the B light from the reflecting prism 23 B side.
• Both the G light reflected by the dichroic prism 23 G and the B light transmitted by the dichroic prism 23 G are incident on the dichroic prism 23 R from the side. I'm going to do it.
• the dichroic prism 23 R reflects the R light passing through the collimating lens 22 R, and transmits the B light and the G light from the dichroic prism 23 G side.
• the hologram forming apparatus further passes through the spatial light modulator 24 for spatially modulating each of the R, G, and B lights from the dichroic prism 23 R, and the spatial light modulator 24.
• a reflection prism 25 for reflecting light and making the light incident on the head 10 is provided.
• the spatial light modulator 24 has a large number of pixels arranged in a lattice pattern, and modulates light spatially depending on the polarization direction by selecting the polarization direction of the emitted light for each pixel. You can do it.
• the spatial light modulator 24 has, for example, the same configuration as that of a liquid crystal display element using the optical rotation of liquid crystal except for a polarizing plate.
• the spatial light modulator 24 rotates the polarization direction by + 90 ° when turned off, and does not rotate the polarization direction when turned on.
• the liquid crystal in the spatial light modulator 16 for example, a ferroelectric liquid crystal having a high response speed (on the order of seconds) can be used. This enables high-speed recording.
• the head 10 includes an objective lens 32 arranged to face the recording medium 1, an actuator 33 capable of moving the objective lens 32 in the thickness direction and the transport direction of the recording medium 1, Opposite to the recording medium 1 in the lens 3 2, a two-segment optical rotation plate 34, an S-polarized hologram 35, a beam splitter 37, a convex lens 38, and a cylindrical lens are arranged in this order from the objective lens 32 side. It has 39 and 4 split photodetectors 40.
• the beam splitter 37 is arranged at an angle of 45 ° with respect to the optical axis direction of the objective lens 32, and reflects a part of the amount of incident light and transmits a part of the amount of light. It has 37 a.
• the light from the side of the reflecting prism 25 in FIG. 1 enters the beam splitter 37 from the side, and a part of the light amount is reflected by the semi-reflective surface 37a, and the S-polarized hologram 35 To be incident on.
• the S-polarized hologram 35 has a lens function of converging light only for S-polarized light.
• S-polarized light is linearly polarized light whose polarization direction is perpendicular to the plane of incidence (the paper surface in Fig. 4), and P-polarized light is linearly polarized light whose polarization direction is parallel to the plane of incidence.
• the two-part optical rotation plate 34 has a light rotation plate 34 L arranged on the left side of the optical axis in FIG. 4 and a light rotation plate 34 R arranged on the right side of the optical axis in FIG. ing.
• the optical rotation plate 34 L rotates the polarization direction by 45 °
• the optical rotation plate 34 R rotates the polarization direction by + 45 °.
• embossed pits 5a At the lower end of the guide section 5, information for performing tracking servo and address information are recorded by embossed pits 5a arranged along the moving direction of the head 10.
• the light emitted from the objective lens 32 so as to converge so as to have the smallest diameter on the back side of the recording medium 1 is reflected at the lower end of the guide section 5, and is modulated by the embossed pipe 5a.
• the light is incident on the objective lens 22.
• This return light passes through the two-segment optical rotation plate 34 and the S-polarization hologram 35, and enters the beam splitter 37, and a part of the light amount passes through the semi-reflective surface 37a to form the convex lens 38.
• the light passes through a cylindrical lens 39 and enters a four-divided photodetector 40.
• the quadrant photodetector 40 is divided by a dividing line 40A parallel to the moving direction of the head 10 and a dividing line 40B in the direction perpendicular to the moving direction. It has the four light receiving sections 40a to 40d.
• the central axis of the cylindrical surface of the cylindrical lens 39 corresponds to the dividing lines 4 OA and 40 B of the 4-split photodetector 40. It is arranged so as to make 45 °.
• the recording medium 1 shown in FIG. 5 is capable of recording and reproducing color three-dimensional image information.
• This recording medium 1 has a hologram layer 52B, 52G, 52R on one surface of a transparent substrate 51 on which information is recorded by a three-dimensional interference pattern using volume holography, and a protective layer.
• the layers 53 are stacked in this order.
• the hologram layers 52B, 52G, and 52R are hologram materials whose optical properties such as refractive index, dielectric constant, and reflectivity change according to the intensity of light when irradiated.
• the optical characteristics of the hologram layer 52 B change only by the light of B
• the optical characteristics of the hologram layer 52 G change only by the light of G
• the hologram layer 52 R changes only by the light of R.
• the optical properties change.
• a photopolymer photopot 1 ymers
• the recording medium 1 When the recording medium 1 is capable of recording and reproducing monochromatic three-dimensional image information, the recording medium 1 is optically changed by the light used instead of the hologram layers 52B, 52G, 52R. What is necessary is just to provide a single hologram layer whose characteristics change.
• FIG. 6 is a block diagram showing a circuit configuration of the hologram creating apparatus according to the present embodiment.
• the hologram forming apparatus includes a detection circuit 61 for detecting a focus error signal FE, a tracking error signal TE, and a reproduction signal RF from an output signal of the head 10;
• the actuator 33 in the head 11 is driven to move the objective lens 32 in the thickness direction of the recording medium 1 so that the focus servo is performed.
• the objective lens 3 2 is driven by driving the actuator 33 in the head 11 based on the focusing support circuit 62 and the tracking error signal TE detected by the detection circuit 61.
• a tracking support circuit 63 for performing tracking support by moving in the transport direction of 1.
• the hologram forming apparatus includes a signal processing circuit 64 that reproduces a basic clock and determines an address from a reproduction signal RF from the detection circuit 61, and a controller 65 that controls the entire hologram forming apparatus. . Controller 65 is a signal
• the basic clock and address information output from the processing circuit 64 are input, and the VCM 13, the R light source 21 R, the G light source 21 G, the B light source 21 B, the spatial light modulator 24,
• the transport device 20, the ultraviolet lamp 6 and the heat roller 8 are controlled.
• the transport device 20 is a device for transporting the recording medium 1 from a supply unit (not shown) to a discharge unit (not shown).
• the transfer device 20 constitutes a position changing unit in the present invention.
• the controller 65 has a function of inputting three-dimensional image information 67 from the outside and calculating a modulation pattern of the information light at the time of recording based on the three-dimensional image information 67.
• the actuator 33, the detection circuit 61, the focus support circuit 62, and the tracking support circuit 63 correspond to the position control means in the present invention.
• the hologram creation device further includes an operation unit 66 for giving various instructions to the controller 65.
• the controller 65 has a CPU (Central Processing Unit), ROM (Read Only Memory) and RAM (Random Access Memory), and the CPU uses the RAM as a work area and stores programs stored in ROM. By executing the above, the function of the controller 65 is realized.
• CPU Central Processing Unit
• ROM Read Only Memory
• RAM Random Access Memory
• FIG. 7 is a block diagram showing a configuration of a detection circuit 61 for detecting the focus error signal FE, the tracking error signal TE, and the reproduction signal RF based on the output of the four-split photodetector 40.
• the detection circuit 61 includes an adder 41 for adding the respective outputs of the diagonal photodetectors 40 a and 40 d of the quadrant photodetector 40, and a diagonal photodetector 4 O b and 40 d of the quadrant photodetector 40.
• an adder 42 that adds the outputs of c and a subtractor 43 that calculates the difference between the output of the adder 41 and the output of the adder 42 to generate a focus error signal FE by the non-point difference method
• the adder 44 adds the outputs of the light receiving sections 40 a and 40 b adjacent to each other along the moving direction of the head 10 in the four-segment photodetector 40, and the movement of the head 10 in the four-segment photodetector 49
• An adder 45 that adds the outputs of the light receiving units 40 c and 40 d adjacent in the direction, and calculates the difference between the output of the adder 44 and the output of the adder 45 to calculate the tracking error by the push-pull method.
• the reproduction signal RF is a signal obtained by reproducing information recorded by the emboss pit 5a of the guide unit 5.
• FIG. 8 is a flow chart showing the operation of the hologram creating apparatus according to the present embodiment
• FIGS. 9A to 9D are hologram creating methods according to the present embodiment and reproducing a three-dimensional image from the created hologram.
• FIG. 4 is an explanatory diagram showing a method.
• the controller 65 when the recording medium 1 is irradiated with the reference light for reproduction, the controller 65 generates a reproduction light corresponding to a desired three-dimensional image.
• a three-dimensional interference pattern is calculated (step S101). This uses computer holography technology, as shown in FIG. 9A, assuming a reference beam 201 and an object beam 203 from a three-dimensional image 202 to be displayed. Then, the three-dimensional interference pattern 204 formed in the recording medium 1 when the reference light 201 and the object light 203 are irradiated is calculated.
• parallel light is assumed as the reference light. However, the reference light may be diffused light or converged light.
• the calculation of the three-dimensional interference pattern 204 is specifically performed as follows, for example. First, on a predetermined plane whose coordinates are represented by (x, y), the amplitude and phase information of the reference light 201 is set to (X, y), and the amplitude and phase information of the (X, y) and are represented by the following equations, respectively. In the following equations, it represents the amplitude, [Phi .kappa.1, phi 01 represents the phase.
• ⁇ i (x, y) o 1 (x, y) exp ⁇ j ⁇ 01 (x, y) ⁇
• the light intensity I, (x, y) on the predetermined plane is represented by the following equation (1).
• the controller 65 divides the three-dimensional interference pattern 20 into partial interference patterns 205 (Step S102).
• the partial interference pattern 205 is a part of the three-dimensional interference pattern 204, as shown in FIG. It refers to a three-dimensional interference pattern in a region where two illuminated recording light beams overlap.
• one of the two recording light beams is referred to as a recording reference light, and the other is referred to as a recording information light.
• the controller 65 calculates a recording reference light and a recording information light for each of the partial interference patterns 205 (step S103). This is specifically performed, for example, as follows. First, on a predetermined plane whose coordinates are represented by (x, y), the amplitude and phase information of the reference light at the time of recording is R 2 (x, y), and the amplitude and phase information of the information light at the time of recording Let ⁇ 2 (X, y) be represented by the following equations, respectively. In the following equation, r 2 and o 2 represent amplitude, and ⁇ ⁇ 2 and ⁇ 02 represent phase.
• R 2 , x, y) r 2 (x, y) e ⁇ ⁇ ⁇ j R2 ( ⁇ , y ⁇
• the light intensity I 2 (x, y) on the predetermined plane is expressed by the following equation (2).
• I 2 (x, y) ⁇ r 2 (x, y) ⁇ 2 + ⁇ o 2 (, y) ⁇ 2
• each plane (x, y) I 2 (x, y) or I i ix, y) - the I. (x, y)
• the reference light for recording and the information for recording Calculate the lighting. In this case, if the recording-time reference light is a uniform light or a light having a certain relation to the recording-time information light, the calculation becomes easy.
• the controller 65 calculates a modulation pattern for obtaining desired recording reference light and recording information light according to the calculation results of the recording reference light and the recording information light, and uses this modulation pattern.
• the spatial light modulator 24 is controlled, and as shown in FIG. 9C, the recording medium 1 is irradiated with the recording reference light 206 and the recording information light 207, and The interference pattern 205 is actually recorded on the recording medium 1, and partial holograms (hereinafter, referred to as partial holograms) corresponding to the respective partial interference patterns 205 are sequentially formed (step S10). 4), Create an overall hologram.
• the hologram to be created is a transmission type hologram. (Fresnel type) hologram.
• the hologram 2 1 1 is moved from the same direction as the reference beam 201 in FIG. 9A.
• the reference light for reproduction may be applied, or as shown in FIG. 9D, the hologram 2 11 1 may be irradiated with the reference light for reproduction 2 12 in the opposite direction to the reference light 201. Is also good.
• the hologram 2 1 1 is irradiated with the reference light for reproduction from the same direction as the reference light 2 0 1
• the upper side of the hologram 2 1 1 appears as a virtual image.
• the hologram creating apparatus can create a hologram capable of reproducing a color three-dimensional image. Therefore, in the present embodiment, the hologram layers 52 B, 52 G, and 52 R of the recording medium 1 are three-dimensional images for each of R, G, and B, which constitute the same three-dimensional image, respectively. Create a hologram corresponding to. In the present embodiment, in particular, holograms for each of R, G, and B are created by time-divisionally creating partial holograms for each of R, G, and B.
• the light source devices 21 R, 21 G, and 2 IB for each of R, G, and B and the spatial light modulator 24 are controlled as shown in FIGS. 10A to 10D. That is, as shown in FIG. 10D, the spatial light modulator 24 has, at a fixed period, a modulation pattern corresponding to the partial hologram of the R image, a modulation pattern corresponding to the partial hologram of the G image, and B It is driven by repetition of a modulation pattern corresponding to a partial hologram of an image. As shown in FIG. 1A, the R light source device 21 R emits R light at a timing at which the spatial light modulator 24 is driven by a modulation pattern corresponding to a partial hologram of the R image.
• the G light source device 21G emits the G light at the timing when the spatial light modulator 24 is driven by the modulation pattern corresponding to the partial hologram of the G image.
• the B light source device 21 B emits B light in the evening when the spatial light modulator 24 is driven by a modulation pattern corresponding to the partial hologram of the B image.
• each of the light source devices 21 R, 21 G, and 21 B emits S-polarized light.
• the R light emitted from the R light source device 21 R is converted into a parallel light beam by the collimating lens 22 R, reflected by the dichroic prism 23 R, and incident on the spatial light modulator 24.
• the G light emitted from the G light source device 21G is converted into a parallel light beam by the collimating lens 22G, reflected by the dichroic prism 23G, transmitted through the dichroic prism 23R, and The light enters the optical modulator 24.
• the B light emitted from the B light source device 21B is converted into a parallel light beam by the collimator lens 22B, reflected by the reflecting prism 23B, transmitted through the dichroic prisms 23G and 23R, and is emitted as spatial light.
• the light enters the modulator 24.
• the light spatially modulated by the spatial light modulator 24 is reflected by the reflecting prism 25 and enters the head 10.
• the light spatially modulated by the spatial light modulator 24 is light set to S-polarization or P-polarization for each pixel.
• A-polarized light and B-polarized light used in the following description are defined as follows.
• A-polarized light is S-polarized light with a degree of 45 ° or P-polarized light with a + 45 ° rotation
• B-polarized light is S-polarized light with a + 45 ° or P-polarized light with a degree of 45 °. Is rotated linearly polarized light.
• the polarization directions of the A-polarized light and the B-polarized light are orthogonal to each other.
• the light that has entered the head 10 enters the beam splitter 37 from the side, and a part of the light amount is reflected by the semi-reflective surface 37 a and enters the S-polarized hologram 35.
• the P-polarized light passes through the S-polarized hologram 35 as a parallel light beam.
• this light is used as reference light for recording.
• the reference light at the time of recording enters the split optical rotation plate 34, of which the light passing through the optical rotation plate 34L is rotated by ⁇ 45 ° in the polarization direction to become B-polarized light.
• the transmitted light is rotated by + 45 ° in the polarization direction and becomes A-polarized light.
• the recording-time reference light is condensed by the objective lens 32, irradiates the recording medium 1, passes through the recording medium 1 while converging, and converges to have the smallest diameter at the back side of the recording medium 1.
• the S-polarized light is slightly converged by the S-polarized hologram 35.
• this light is used as information light for recording.
• the recording information light is incident on the split optical rotation plate 34, of which the light that has passed through the optical rotation plate 34 L has its polarization direction rotated by ⁇ 45 ° to become A-polarized light and passes through the optical rotation plate 34 R.
• the polarized light has a polarization direction of +45. Rotated to B-polarized light.
• the recording information light is condensed by the objective lens 32 and irradiates the recording medium 1, converges to the smallest diameter before the recording medium 1, and then passes through the recording medium 1 while diverging. .
• FIG. 12 and FIG. 13 are explanatory diagrams showing the state of light in the vicinity of the recording medium 1.
• the symbol denoted by reference numeral 71 indicates P-polarized light
• the symbol denoted by reference numeral 72 indicates S-polarized light
• the symbol denoted by reference numeral 73 indicates A-polarized light
• the symbol indicated by 4 represents B-polarized light.
• the recording reference light that passed through the optical rotation plate 34R and the recording information light that passed through the optical rotation plate 34L both interfered because they were A-polarized light.
• the pattern is recorded on the recording medium 1. Further, as shown in FIG. 13, the recording reference light passing through the optical rotation plate 34 L and the recording information light passing through the optical rotation plate 34 R interfere with each other because they are B-polarized light. The interference pattern is recorded on the recording medium 1. Thus, a partial hologram is formed on the recording medium 1.
• a partial hologram is formed on the hologram layer 52R in FIG. 5, and when the reference light during recording and the information light during recording are G light, a partial hologram is formed on the hologram layer 52G in FIG.
• the reference light for recording and the information light for recording are B light, a partial hologram is formed on the hologram layer 52B in FIG.
• the recording reference light is reflected at the lower end of the guide portion 5 and becomes return light modulated by the embossed pit 5a.
• the return light of A-polarized light corresponding to the reference light at the time of recording that passed through the optical rotation plate 34R intersects with the information light at the time of recording of B-polarized light that passed through the optical rotation plate 34R.
• the B-polarized return light corresponding to the recording reference light that has passed through the optical rotator 34L intersects with the A-polarized information light that has passed through the optical rotator 34L, so that they do not interfere with each other.
• the recording medium 1 is transported by the transport device 20, and the transport device 20 stops the recording medium 1 while the head 10 forms a partial hologram for one line.
• the head 10 sequentially forms partial holograms while moving from one end to the other end of the range for forming partial holograms.
• the transport device 20 moves the recording medium 1 by a predetermined distance between lines, and then stops the recording medium 1. Then, in the same manner as the above-described operation, a partial hologram for the next one line is formed. By repeating such operations, an entire hologram is created.
• the recording-specific reference light is reflected at the lower end of the guide portion 5 and becomes return light modulated by the emboss pits 5a.
• This return light is converted into a parallel light flux by the objective lens 32, passes through the two-segment optical rotation plate 34, becomes S-polarized light, passes through the S-polarization hologram 35, is slightly converged, and then is beam split. Part of the light enters the evening 37, passes through the semi-reflective surface 37a, passes through the convex lens 38 and the cylindrical lens 39, and enters the quadrant photodetector 40.
• the detection circuit 61 detects the focus error signal FE, the tracking error signal TE, and the reproduction signal RF based on the output of the four-division photodetector 40. Then, based on the focus error signal FE, the focus support circuit 61 allows the positional relationship between the recording reference light and the recording information light and the recording medium 1 in the thickness direction of the recording medium 1 to be always constant. Focus support is provided for c Further, based on the tracking error signal TE, the tracking support circuit 62 keeps the positional relationship between the recording reference light and the recording information light and the recording medium 1 in the transport direction of the recording medium 1 always constant. The tracking support is performed so that Further, based on the reproduction signal RF, the signal processing circuit 64 reproduces the basic clock and determines the address.
• FIG. 14 shows an example of an arrangement of partial holograms for each of R, G, and B.
• circles denoted by R, G, and B represent partial holograms for each of R, G, and B, respectively.
• the portion of the recording medium 1 where the partial hologram is formed reaches the position of the ultraviolet lamp 6, is irradiated with ultraviolet light by the ultraviolet lamp 6, and is further heated. After reaching the position of the roller 8, heat is applied by the roller 8, and the partial interference pattern (partial hologram) recorded by the head 10 is fixed.
• the recording medium 1 on which all the partial holograms have been formed and fixed is turned into a stabilized hologram, transported by the transport device 20 and discharged from the discharge unit.
• the reproducing apparatus 300 shown in FIG. 15 has a form like an overhead projector (hereinafter, referred to as OHP).
• the reproducing device 300 includes a cubic main body 301, an arm 302 extending above the back of the main body 301, and an upper end of the arm 302. And a mirror part 303 connected to the part.
• the upper surface of the main body 301 is formed of a transparent member such as glass, and the upper surface is a mounting surface 304 on which the hologram 211 is mounted.
• a light source device 311 for emitting light serving as a reference light, and a predetermined light such as a parallel light by condensing the light emitted from the light source device 311.
• An optical system 312 for forming the reference light 313 and irradiating the hologram 211 mounted on the mounting surface 304 with the lower side is provided.
• the light source device 311 is a reproducing device that reproduces a color three-dimensional image, for example, a device that emits R, G, and B laser beams or a device that emits white light is used.
• a reproducing apparatus for reproducing a two-dimensional image for example, a laser beam having a predetermined wavelength is used. It shall be emitted.
• the reference light 3 13 irradiates the hologram 2 1 1 placed on the mounting surface 3 0 4 from below, whereby the reproduction light 3 15 traveling above the hologram 2 1 1 is generated. appear.
• the mirror part 303 has a mirror 305 that reflects the reproduction light 315 generated from the hologram 211 toward the front of the reproduction apparatus 300.
• the reproduction light 3 15 generated from the hologram 2 11 1 is reflected by the mirror 3 05 and travels in front of the reproduction apparatus 3 0 0 to form a real image 3D image 2 0 2. Therefore, the observer can observe the three-dimensional image 202 from the front of the reproducing device 300.
• the hologram 320 shown in FIG. 16 has a form like a movie film. That is, the holo-drum 320 has a belt-like shape as a whole, and a large number of perforations (feed holes) 321 are formed on both sides. A plurality of rectangular hologram portions 3222 are formed along the longitudinal direction between the performance portions 3221 on both sides. Each hologram section 3222 corresponds to one frame of a movie film, and each has a three-dimensional interference pattern corresponding to one three-dimensional image recorded thereon.
• a film-shaped recording medium having a perforation 321 on both sides and a hologram layer at least in a region where the hologram section 3222 is formed is prepared.
• a film-shaped recording medium having a perforation 321 on both sides and a hologram layer at least in a region where the hologram section 3222 is formed is prepared.
• are transported in the longitudinal direction partial holograms are sequentially formed, and each hologram section 322 is formed by a plurality of partial holograms.
• the reproducing apparatus 330 shown in FIG. 17 has a form like a projector.
• the reproducing device 330 includes a driving device (not shown) for intermittently moving the hologram 3220 in the longitudinal direction, a light source device 331 for emitting light serving as reference light, and a light source device 331.
• a predetermined reference light 3333 such as a parallel light is formed by condensing light emitted from the An optical system 332 for irradiating the gram section 3222 and a reflection type screen for reflecting the reproduction light 335 generated from the hologram section 322 when the reference beam 333 is irradiated. 3 3 and 6 are provided.
• the light source device 331 is the same as the light source device 311 in the reproducing device 300 shown in FIG.
• the hologram 320 is intermittently driven by the driving device, and the reference beam 3333 is applied to the holo-drum portion 3222 only while the hologram 320 is stopped. Irradiated.
• the light source device 331 may emit light intermittently or a shirt may be used. Irradiation of the reference light 3 3 3 generates a reproduction light 3 3 5 from the hologram section 3 2 2, and this reproduction light 3 3 5 is reflected by the screen 3 3 6 and in front of the screen 3 3 6.
• a three-dimensional image 337 of the real image is formed. Therefore, the observer can observe the three-dimensional image 3337 from the front of the screen 3336.
• each hologram section 3 22 of the hologram 3 22 corresponds to a 3D image corresponding to each frame of a moving image, such as a movie, a moving 3D image can be reproduced. Can be done.
• the head 10 irradiates a part of the recording medium 1 with the reference light for recording and the information light for recording.
• a part of an interference pattern for generating a reproduction light corresponding to a desired three-dimensional image when the reproduction reference light is irradiated, and a relative position between the head 10 and the recording medium 1 is recorded.
• the hologram was created by performing multiple operations of recording a part of the interference pattern while changing the physical positional relationship, so it was limited by the size of the 3D image to be reproduced and the size of the hologram. Holograms for reconstructing 3D images can be easily created.
• a plurality of recording luminous fluxes that form a part of an interference pattern for generating reproduction light corresponding to a desired three-dimensional image when irradiated with the reproduction reference light are calculated. Calculate a modulation pattern that can obtain this recording light beam, generate a recording light beam modulated with this modulation pattern, and always use this recording light beam. Since the recording medium 1 is irradiated from the same direction, the hologram for reproducing the three-dimensional image can be easily created without being restricted by the reference light at the time of reproduction.
• the interference pattern is recorded part by part, it is possible to create holograms of various shapes.
• the final hologram is formed by combining several pieces, and each of the fragments is used as the holo-drama producing apparatus according to the present embodiment. What is necessary is just to create it.
• the recording medium 1 capable of recording a three-dimensional interference pattern is used, and the three-dimensional interference pattern is recorded on the recording medium 1, so Bragg diffraction is effectively used. This can improve the diffraction efficiency and expressiveness of 3D image display.
• the recording medium 1 is formed in the form of a sheet, and the recording reference light and the recording information are recorded on the recording medium 1 such that the optical axes of the respective lights are arranged on the same line. 1 is illuminated from the same side, so that one head 10 can irradiate the recording medium 1 with the recording reference light and the recording information, and the optical The system can be made smaller.
• the position of the recording reference light and the recording information with respect to the recording medium 1 is controlled using the light reflected by the guide portion 5 at the time of recording. Can be well created.
• the present embodiment it is possible to easily create a hologram in which arbitrary three-dimensional image information is recorded, as in printing using a normal printer. For this reason, holograms can be easily copied, and a large number of holograms containing the same three-dimensional image information can be created. If the hologram creation device according to the present embodiment and the reproducing device for reproducing the 3D image from the hologram are provided at a remote location, the 3D image information is transmitted to the remote location using an internet or the like, and the hologram is transmitted.
• a hologram can be created by the creator, and a 3D image can be reproduced from the created hologram. Anywhere, creation of a holo-drama with the same quality of 3D image information and reproduction of a 3D image of the same quality can be performed. It becomes possible.
• the luminous flux for recording is obtained by calculation based on three-dimensional image information, for example, three-dimensional image data handled by a computer, so that the hologram can be modified by correcting the three-dimensional image data. Can be easily corrected. Therefore, when creating the final hologram while making appropriate corrections, the final hologram is compared to the method of creating a hologram by interfering the object light from the actual object with the reference light.
• a thin sheet-like hologram can be created, so that a hologram that is excellent in portability like a conventional OHP sheet and can be filed like paper is created. can do.
• the conventional ⁇ HP sheet and ⁇ HP can be used.
• the presentation using three-dimensional images becomes possible with ease.
• the recording medium 1 capable of recording a three-dimensional interference pattern is used, and the three-dimensional interference pattern is recorded on the recording medium 1.
• the recording medium 1 has a plurality of three-dimensional images formed by a combination of each reference light and the object light. Multiple recording of interference patterns is possible. This makes it possible to create a hologram that can reproduce a different three-dimensional image according to the incident direction of the reference light during reproduction.For example, it is assumed that a plurality of parallel lights with different incident directions are used as reference light during reproduction.
• a hologram capable of reproducing a different 3D image depending on the time of day can be created. Can be done. Further, according to the present embodiment, a hologram having a form like a movie film as shown in FIG. 16 is created, and a reproduction having a form like a projector as shown in FIG. By using the device, it is possible to reproduce moving 3D images.
• the spatial light modulator 24 is provided between the dichroic prism 23 R and the reflecting prism 25 in FIG. 1, but the spatial light modulator 24 is It may be arranged between the beam splitter 37 in 10 and the S-polarized hologram 35 or on the incident surface side of the beam splitter 37.
• the spatial light modulator 24 is dedicated to R, G, and B images may be provided.
• FIG. 18 is a perspective view showing the configuration of the hologram forming apparatus according to the present embodiment.
• the hologram forming apparatus according to the present embodiment does not include the spatial light modulator 24 according to the first embodiment.
• a head 410 is provided in place of the head 10 in the first embodiment.
• FIG. 19 is an explanatory diagram showing the configuration of the head in the present embodiment.
• the head 410 in the present embodiment has an objective lens 32 arranged to face the recording medium 1 and the objective lens 32 can be moved in the thickness direction and the transport direction of the recording medium 1.
• the head 410 is further provided with a mirror provided in the traveling direction of light which enters from the reflection prism 25 side in FIG. 18 and passes through the semi-reflection surface 37 a of the beam splitter 37. 1 and a convex lens 4 13, a concave lens 4 14, and a cylindrical lens 4 15 arranged in order from the mirror 4 12 in the traveling direction of the light reflected by the mirror 4 12. ing.
• the light emitted from the cylindrical lens 4 15 The recording medium 1 is irradiated so that the center (optical axis) forms an angle of 45 ° with the surface of the recording medium 1, and intersects with the light from the objective lens 32 side in the recording medium 1. I'm going to do it.
• the light emitted from the cylindrical lens 4 15 is thinnest in the recording medium 1.
• the spatial light modulator 4 11 has a large number of pixels arranged in a lattice pattern, and selects a light transmitting state or a light blocking state for each pixel, so that light is modulated by light intensity. It can be spatially modulated.
• the spatial light modulator 411 is driven by the controller 65 in FIG.
• the light that has entered the head 410 enters the beam splitter 37 from the side, and a part of the light amount is reflected by the semi-reflective surface 37a, Part of the light amount passes through the semi-reflective surface 37a.
• the light reflected by the semi-reflective surface 37a enters the spatial light modulator 411 and is spatially modulated by the spatial light modulator 411.
• this light is used as information light for recording.
• the recording information light is condensed by the objective lens 32 and irradiates the recording medium 1, passes through the recording medium 1 while converging, and converges so as to have the smallest diameter at the back side of the recording medium 1. .
• the light that enters the beam splitter 37 from the side and passes through the semi-reflective surface 37a is reflected by the mirror 41, passes through the convex lens 41 and the concave lens 41 in this order. After that, the diameter of the light beam is reduced, and the light beam is converged only in the optical axis direction of the objective lens 32 by the cylindrical lens 415 to become a light beam having a flat shape, and is irradiated on the recording medium 1.
• this light is used as reference light for recording.
• the recording reference light crosses the recording information light from the objective lens 32 side in the recording medium 1.
• a three-dimensional interference pattern due to the interference between the recording information light and the recording reference light is recorded.
• a partial hologram is created using this interference pattern as a partial interference pattern.
• the shape of the partial hologram is a circular plate.
• FIG. 20 shows a partial hologram 4 2 0 thus formed in the recording medium 1. It shows the state of.
• a plurality of layered partial holograms 420 are formed in the recording medium 1 so as to be laminated.
• the calculation of the reference light for recording and the information light for recording by the controller 65 is performed assuming a partial interference pattern in a layered partial hologram.
• the information light at the time of recording is reflected at the lower end of the guide portion 5 and becomes return light modulated by the emboss pit 5a.
• the returned light is converted into a parallel light beam by the objective lens 32, passes through the spatial light modulator 411 and then enters the beam splitter 37, and a part of the light amount is partially reflected by the semi-reflective surface 37a. Then, the light passes through the convex lens 4 18 and the cylindrical lens 39, and enters the four-division photodetector 40.
• the detection circuit 61 detects a focus error signal FE, a tracking error signal TE, and a reproduction signal RF based on the output of the quadrant photodetector 40.
• FIG. 21 is a side view of the hologram forming apparatus according to the present embodiment.
• an upper head portion 1OA is provided instead of the head 10 in the first embodiment.
• the hologram forming apparatus further includes a lower head section 10B disposed below the guide section 5 and transport rollers 2a, 2b; 3a, 3 above the lower head section 10B.
• Two guide shafts 5 1 1 arranged in parallel to the axial direction of b, and a movable portion 5 1 guided by the guide shaft 5 1 1 and movable along the guide shaft 5 1 1 And two.
• the lower head portion 10B is in contact with the upper end surface of the movable portion 512 and moves together with the movable portion 512.
• the hologram forming apparatus further includes a VCM 513 for moving the movable portion 512 along the guide shaft 511.
• This VCM 513 is configured similarly to VCM 13.
• the VCM 5 13 has a VCM yoke 5 14 arranged below the guide shaft 5 11 and parallel to the guide shaft 5 11, and a VCM yoke 5 14 For VCM yoke 5 1 4 below A VCM yoke 515 which is arranged in parallel at a predetermined interval and is connected at its ends to the VCM yoke 514; and a plate-shaped fixed to the upper surface of the VCM yoke 515
• the VCM includes a VCM magnet 516 and a voice coil 517 arranged around the VCM yoke 514 at a predetermined distance from the outer peripheral surface of the VCM yoke 514.
• the voice coil 5 17 is joined to the lower end surface of the movable section 5 12. With the VCM 5 13 having such a configuration, the lower head portion 10 B is
• the upper head portion 1OA and the lower head portion 10B correspond to the head in the present invention
• VCM 13 and VCM 5 13 correspond to the position changing means in the present invention. Is configured.
• the hologram forming apparatus further receives the light from the reflection prism 25 in FIG. 1, transmits a part of the light amount, makes the light incident on the upper head unit 10A, and shifts a part of the light amount to the lower side.
• FIG. 22 is an explanatory diagram showing the configuration of the upper head portion 10A and the lower head portion 10B.
• the upper head section 10A has a configuration in which the mirror 4 12, the convex lens 4 13, the concave lens 4 14 and the cylindrical lens 4 15 are removed from the head 4 10 shown in FIG. ing.
• the lower head section 10B is a prism 521, which bends the light from the reflective prism 502 side in FIG. 21 upward by 45 ° and emits the light, and emits the light from the prism 521, A convex lens 523, a concave lens 524, and a cylindrical lens 525 arranged in order from the prism 521 in the traveling direction of the light.
• the light emitted from the cylindrical lens 5 25 is applied to the recording medium 1 from below so that the center (optical axis) forms an angle of 45 ° with respect to the surface of the recording medium 1, and the light is recorded. In the medium 1, the light intersects with light from the objective lens 32 side. The light emitted from the cylindrical lens 5 25 is thinnest in the recording medium 1.
• the controller in FIG. 6 is controlled so that the relative positional relationship between the light from the objective lens 32 and the light from the cylindrical lens 525 is constant.
• VCM 13 and VCM 5 13 are linked by the line 65.
• the light that has entered the upper head portion 10A enters the beam splitter 37 from the side, and a part of the light amount is reflected by the semi-reflective surface 37a.
• the light reflected by the semi-reflective surface 37a enters the spatial light modulator 411 and is spatially modulated by the spatial light modulator 411.
• this light is used as information light for recording.
• the recording information light is condensed by the objective lens 32 and radiated onto the recording medium 1, passes through the recording medium 1 while converging, and converges so as to have the smallest diameter at the far side of the recording medium 1. I do.
• the light incident on the lower head section 10B is bent by the prism 521, passes through the convex lens 523 and the concave lens 524 in order, and the diameter of the light beam is reduced, and the cylindrical lens 5 By 25, the light is converged only in the optical axis direction of the objective lens 32 to be a flat-shaped light beam, and the recording medium 1 is irradiated.
• this light is used as the reference light at the time of recording.
• This recording reference light crosses the recording information light from the objective lens 32 side in the recording medium 1.
• this partial hologram is a circular plate, as in the second embodiment.
• this partial hologram is a reflection type (Lipman type) hologram.
• the entire hologram is created by sequentially forming partial holograms while moving the upper head portion 10A and the lower head portion 10B. This hologram becomes a reflection type hologram.
• a reflection hologram can be created.
• this reflection type hologram when the hologram is irradiated with the reference light at the time of reproduction, the reproduction light is generated on the same surface side as the surface irradiated with the reference light, and the observer can reproduce the three-dimensional hologram. Images can be observed.
• the present invention is not limited to the above embodiments.
• the focus support and the tracking support are performed.
• the focus support may be performed.
• the case where the reference light for reproduction and the reference light for recording are different light is described.
• the reference light for reproduction and the reference light for recording are the same light. You may make it become.
• the object light assumed for the three-dimensional image to be displayed can be used as it is as the recording information light, and the calculation of the recording reference light and the recording information light is simplified.
• the hologram forming apparatus or the hologram forming method of the present invention when a reproduction reference beam is irradiated to a part of a recording medium on which information is recorded using holography, The operation of recording a part of the interference pattern by irradiating a plurality of recording light beams that form a part of an interference pattern for generating a reproduction light corresponding to the three-dimensional image is performed by a recording medium and a recording medium.
• the hologram can be created by changing the relative positional relationship with the luminous flux multiple times, so that the size of the 3D image to be reproduced, the size of the hologram, and the reference light during reproduction Thus, it is possible to easily create a hologram for reproducing a three-dimensional image without being restricted by the hologram.
• the recording medium can record a three-dimensional interference pattern, and the interference pattern is a three-dimensional interference pattern. This has the effect that a realistic hologram can be created.
• At least one of the plurality of recording light beams is spatially modulated by a modulation pattern calculated based on information of a three-dimensional image.
• the recording medium is formed in a sheet shape, and the recording medium is irradiated with a plurality of recording light beams from the same surface side.
• the hologram can be created with a simple mechanism.
• the optical system for irradiating the recording luminous flux can be made smaller. This has the effect of being able to configure.
• the hologram forming apparatus or the hologram forming method of the present invention by controlling the positions of the plurality of recording light beams with respect to the recording medium, it is possible to produce a hologram with higher accuracy. .
• the hologram forming apparatus or the hologram forming method of the present invention it is possible to further form a stabilized hologram by providing a fixing unit for fixing an interference pattern recorded on a recording medium. It works. Based on the above description, it is apparent that various aspects and modifications of the present invention can be implemented. Therefore, within the scope equivalent to the following claims, the present invention can be carried out in a form other than the above-described best mode.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Holo Graphy (AREA)
• Optical Recording Or Reproduction (AREA)
• Optical Head (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

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• 1998
  • 1998-02-27 JP JP04751798A patent/JP3729477B2/ja not_active Expired - Fee Related
• 1999
  • 1999-02-26 EA EA200000886A patent/EA002247B1/ru not_active IP Right Cessation
  • 1999-02-26 WO PCT/JP1999/000895 patent/WO1999044102A1/ja not_active Ceased
  • 1999-02-26 US US09/601,624 patent/US6366368B1/en not_active Expired - Lifetime
  • 1999-02-26 CN CN99803385A patent/CN1292104A/zh active Pending
  • 1999-02-26 EP EP99906493A patent/EP1059574B1/en not_active Expired - Lifetime
  • 1999-02-26 KR KR1020007009502A patent/KR20010041378A/ko not_active Ceased
  • 1999-02-26 AU AU26406/99A patent/AU737232B2/en not_active Ceased
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