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 Title: |
US5270842:
Holographic recording and scanning system and method
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Clay, Burton R.; Wayland, MA
Rowe, David M.; Bellingham, MA
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| Assignee: |
Holographix, Inc., Hudson, MA
other patents from HOLOGRAPHIX INC. (255770) (approx. 4)
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| Published / Filed: |
1993-12-14
/ 1992-11-23
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| Application Number: |
US1992000980010
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| IPC Code: |
Advanced:
G02B 5/32;
G02B 26/10;
Core:
more...
IPC-7:
B29D 11/00;
G03H 1/04;
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| U.S. Class: |
Current:
359/012;
264/001.33;
359/030;
430/001;
Original:
359/012;
264/001.3;
359/030;
430/001;
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| Field of Search: |
359/012,30
264/1.3
430/1;2
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| Priority Number: |
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| Abstract: |
A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes. Further, a method is provided in which a scanning disc may be replicated on various transparent materials.
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| Attorney, Agent or Firm: |
Skjerven, Morrill, MacPherson, Franklin & Friel ;
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| Primary / Asst. Examiners: |
Lerner, Martin;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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