Holographic stereogram device

• US 7,057,779 B2
• Filed: 05/21/2003
• Issued: 06/06/2006
• Est. Priority Date: 05/21/2003
• Status: Expired due to Fees

• Current Assignee: IWIN Technology Co., Ltd. (K Laser China Group Co. Ltd.)
• Original Assignee: K Laser Technology Incorporated
• Inventors: Lee, Wai-Hon
• Primary Examiner(s): Robinson, Mark A.
• Assistant Examiner(s): AMARI, ALESSANDRO V
• Application Number:
  US10/443,500
• Publication Number:
  US 20040233489A1
• Time in Patent Office: 1,112 Days
• Field of Search: 359/9, 359/23, 359/29
• US Class Current: 359/23
• CPC Class Codes: G02B 5/1876 Diffractive Fresnel lenses; Zone plates; Kinoforms G02B5/1842, G02B5/1847 take precedence; optical systems having diffractive correction means G02B27/0037; Fresnel lenses operating by refraction G02B3/08
• CPC Class Codes: G03H 1/16 using Fourier transform G03H1/10, G03H1/12, G03H1/14 take precedence; analogue computers G06G, e.g. G06G7/19
• CPC Class Codes: G03H 1/268 Holographic stereogram
• CPC Class Codes: G03H 2210/22 2D SLM object wherein the object beam is formed of the light modulated by the SLM SLM per se G03H2001/0224

Abstract

An improvement to the above described techniques for producing a holographic stereogram. The present invention uses a hologram lens in the process of creating the holographic stereogram, and also uses Fourier transforms of the images for projection onto the recording medium, not the images themselves. A lens between the generated images and the recording medium performs the inverse Fourier transform to convert the image back into a normal image.

Claims

1. A system for recording a holographic stereogram on a recording medium comprising:

a source image display having a plurality of pixels represented by a Fourier transform hologram;

a laser source for illuminating said source image display;

a lens system for focusing an image on said recording medium, said lens system including a inverse Fourier transformation lens, causing said holographic stereogram to appear on said recording medium.

2. The system of claim 1 wherein said source image display is an LCD panel.

3. The system of claim 1, further comprising a first mask with a slit positioned between said source image display and said recording medium to limit the diffracted orders allowed to propagate to said recording medium.

4. The system of claim 1 further comprising a mask with a slit positioned between said lens system and said recording medium to restrict the recording width on said recording medium.

5. The system of claim 1 wherein the image pixels on said source image display are multiplied by a random phase before the computation of said Fourier transform.

6. The system of claim 1 wherein said lens system includes a telecentric lens system with a spherical lens and a cylindrical lens.

7. A system for recording a holographic stereogram on a recording medium comprising:

a source image LCD display panel having a plurality of pixels represented by a Fourier transform hologram, wherein the image pixels on said source image display panel are multiplied by a random phase before the computation of said Fourier transform;

a laser source for illuminating said source image display;

a first mask with a slit positioned between said source image LCD display panel and said recording medium to limit the diffracted orders allowed to propagate to said recording medium;

a lens system, for focusing an image on said recording medium, causing said holographic stereogram to appear on said recording medium, said lens system including an inverse Fourier transformation lens for performing inverse Fourier transformation is mounted between said source image display and said recording medium;

a second mask with a slit positioned between said lens system and said recording medium to restrict the recording width on said recording medium.

8. A method for recording a holographic stereogram on a recording medium comprising:

providing a source image having a plurality of pixels represented by a Fourier transform;

illuminating said source image with a laser source;

diffracting said source image with a hologram;

performing an inverse Fourier transformation on said source image; and

focusing an image on said recording medium, causing said holographic stereogram to appear on said recording medium.

9. The method of claim 8 further comprising:

limiting the diffracted orders allowed to propagate from said hologram using a mask with a slit.

10. The method of claim 8 further comprising:

restricting the recording width on said recording medium using a mask with a slit.

11. The method of claim 8 further comprising:

multiplying the pixels of said source image by a random phase before the computation of said Fourier transform.