Holographic stereogram forming apparatus

• US 7,046,409 B2
• Filed: 04/22/2004
• Issued: 05/16/2006
• Est. Priority Date: 05/08/2003
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kihara, Nobuhiro
• Primary Examiner(s): Robinson, Mark A.
• Assistant Examiner(s): AMARI, ALESSANDRO V
• Application Number:
  US10/829,202
• Publication Number:
  US 20040263929A1
• Time in Patent Office: 754 Days
• Field of Search: 359/23, 359/35
• US Class Current: 359/23
• CPC Class Codes: G03H 1/268 Holographic stereogram
• CPC Class Codes: G03H 2001/2685 One step recording process
• CPC Class Codes: G03H 2223/14 Diffuser, e.g. lens array, random phase mask

Abstract

Between a spatial beam modulator for modulating an object beam and a one-dimensional diffuser plate for diffusing the object beam modulated by the spatial beam modulator in a one-dimensional direction, there is arranged an object projection optical system for processing the object beam modulated by the spatial beam modulator in such a manner that, in the one-dimensional direction of the one-dimensional diffuser plate, images displayed by the spatial beam modulator are formed on the one-dimensional diffuser plate, and, in a direction substantially orthogonal to the one-dimensional direction, the object beam is condensed onto a hologram recording medium. In the one-dimensional direction of the one-dimensional diffuser plate, the images displayed by the spatial beam modulator are formed on the one-dimensional diffuser plate, whereby blurring of the images with the one-dimensional direction as a non-parallactic direction can be suppressed.

Claims

1. A holographic stereogram forming apparatus comprising:

a laser source for emitting a laser beam;

beam separating means for separating said laser beam emitted from said laser source into a reference beam and an object beam;

reference beam irradiating means for irradiating a hologram recording medium with said reference beam separated by said beam separating means;

a spatial beam modulator for displaying an image and modulating said object beam separated by said beam separating means;

a one-dimensional diffuser plate for diffusing said object beam modulated by said spatial beam modulator in a one-dimensional direction; and

an object projection optical system including a spherical lens system for forming said image displayed by said spatial beam modulator in said one-dimensional direction and a cylindrical lens system for condensing said object beam on said hologram recording medium in a direction substantially orthogonal to said one-dimensional direction said object projection optical system being, disposed between said spatial beam modulator and said one-dimensional diffuser plate for processing said object beam modulated by said spatial beam modulator in such a manner that said image displayed by said spatial beam modulator is formed on said one-dimensional diffuser plate in the one-dimensional direction of the one-dimensional diffuser plate using the spherical lens system,

a condensing position of the object beam is controlled by regulating the spacing between said spherical lens system and said cylindrical lens system, wherein a focal distance of the cylindrical lens system and a focal distance of the spherical lens system are selected such that the spatial beam modulator and the one-dimensional diffuser are located at optically conjugate positions.

2. The holographic stereogram forming apparatus according to claim 1, further comprising:

means for shutting off said laser source;

a mechanism for intermittently feeding said hologram recording medium; and

a control mechanism for regulating the timings of the display of said image by said spatial beam modulator and the operation of said intermittent feeding mechanism.

3. The holographic stereogram forming apparatus according to claim 1, further comprising:

a switch configured to shut off said laser source;

a mechanism configured to intermittently feed said hologram recording medium; and

a control mechanism configured to regulate the timings of the display of said image by said spatial beam modulator and the operation of said mechanism.

4. A holographic stereogram forming apparatus comprising:

a laser source for emitting a laser beam;

beam separator configured to separate said laser beam emitted from said laser source into a reference beam and an object beam;

reference beam irradiator configured to irradiate a hologram recording medium with said reference beam separated by said beam separator;

a spatial beam modulator configured to display an image and modulating said object beam separated by said beam separator;

a one-dimensional diffuser plate configured to diffuse said object beam modulated by said spatial beam modulator in a one-dimensional direction; and

an object projection optical system including a spherical lens system configured to form said image displayed by said spatial beam modulator in said one-dimensional direction and a cylindrical lens system configured to condense said object beam on said hologram recording medium in a direction substantially orthogonal to said one-dimensional direction, said object projection optical system being, disposed between said spatial beam modulator and said one-dimensional diffuser plate configured to process said object beam modulated by said spatial beam modulator in such a manner that said image displayed by said spatial beam modulator is formed on said one-dimensional diffuser plate in the one-dimensional direction of the one-dimensional diffuser plate using the spherical lens system, wherein

a condensing position of the object beam is controlled by regulating the spacing between said spherical lens system and said cylindrical lens system, wherein a focal distance of the cylindrical lens system and a focal distance of the spherical lens system are selected such that the spatial beam modulator and the one-dimensional diffuser are located at optically conjugate positions.