APPARATUS FOR CONSTRUCTING A REDUCED INFORMATION CONTENT HOLOGRAM

• US 3,643,017 A
• Filed: 02/26/1970
• Issued: 02/15/1972
• Est. Priority Date: 02/26/1970
• Status: Expired due to Term

• Current Assignee: Dietlind Pekau
• Original Assignee: Dietlind Pekau
• Inventors: Pekau, Dietlind
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Leibowitz, Barry
• Application Number:
  US05/014,354
• Time in Patent Office: 719 Days
• Field of Search: 350/3.5 178/6.5
• US Class Current: 348/40
• CPC Class Codes: G03H 1/34 Systems for reducing the space-spatial bandwidth product

Abstract

Apparatus for forming a reduced information content hologram, for transmitting that hologram, and for the reconstruction of a scene or object from that hologram. The reduced information content hologram is formed employing a cylindrical lens or other means for focusing in one dimension. The hologram produced by the apparatus of this invention provides an image having parallax information along a preselected dimension but no parallax information along all lines running perpendicular to that preselected dimension.

Claims

1. A television system for providing images having parallax information along one axis comprising:

means for forming a hologram on a surface to provide an image having parallax information along a preselected direction but having substantially no direction;

information along all lines running perpendicular to said preselected direction;

means for transmitting said hologram;

including means for scanning along said hologram and providing electrical signals representing the characteristics of said hologram, said represented points being more closely spaced along lines running parallel to a preselected direction in the plane of said surface that along lines running perpendicular to said preselected direction in the plane of said surface. means for receiving said transmitted hologram; and

display means for using said received hologram to provide an output image having parallax informatioN along one axis.

2. The television system set forth in claim 1 in which said means for forming a hologram comprises:

means for irradiating an object with a first beam of coherent radiation, said irradiating means being arranged so that a modulated radiation signal carrying information of said object is directed along a predetermined path;

means for removing information available for the creation of a hologram from one dimension of said modulated radiation signal; and

means for mixing a second beam of coherent radiation having substantially the same frequency as that of said first beam with said modulated first beam to create a hologram having reduced perspective information along one axis.

3. A television system for providing images having parallax information along one axis comprising:

means for forming a hologram to provide an image having parallax information along a preselected direction but having substantially no parallax information along all lines running perpendicular to said preselected direction;

means for transmitting said hologram;

means for receiving said transmitted hologram; and

display means having means for providing a beam of coherent radiation, means for using said received hologram to modulate said beam, and first one-dimensional focusing means for receiving said modulated beam and providing an output image having parallax information along one direction but having no parallax information along lines perpendicular to said one direction.

4. The television system of claim 3 in which:

said beam providing means comprises means for providing a beam of visible laser light;

said modulating means includes a surface which modulates light striking said surface when a voltage is maintained across said surface, the degree of modulation being dependent upon the voltage maintained across said surface, means for reconstructing said hologram in the form of an electrical potential pattern across said surface, and means for directing said beam of visible laser light onto said modulating surface; and

said first one-dimensional focusing means comprises cylindrically shaped focusing means disposed to receive said modulated laser beam from said modulating surface.

5. The television system of claim 3 in which said means for forming said hologram includes:

a recording surface;

means for irradicating an object with a first beam of coherent radiation, said irradicating means being arranged so that a modulated radiation signal carrying information of said object is directed to strike said surface;

second one-dimensional focusing means disposed between said object and said surface for focusing said modulated first beam along one dimension;

means for directing a second beam of radiation mutually coherent with said modulated first beam to intersect and interfere with said modulated first beam proximate said surface to form a hologram having reduced parallax information along one axis; and

the position of said first one-dimensional focusing means is defined by;

the magnification equation the holographic image equation the lens equation D1 the distance between said object and said said second one-dimensional focusing means;

D1 the distance between said surface and said second one-dimensional focusing means;

D3 the distance between said received hologram and said output image;

D4 the distance between said received hologram and said first one dimension focusing means;

F1 the focal power of said first one-dimensional focusing mean;

R1 and R2 the radius of curvature terms defining the nature of the coherent radiation used in the construction of said hologram and said image respectively.