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Patent US3620598A successfully refreshed from Google Patents.
US3620598A
Expired / Lapsed
US
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Spatial frequency diversity for coherent optical processing
Assignee: Westinghouse Electric Corp
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Filing: 1970-03-06
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Granted: 1971-11-16
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Expires: 1990-03-06
Abstract
Abstract Apparatus for improving the quality of an input transparency used in an optical processor. The input transparency is illuminated with coherent light which has been passed through a fine grating or grid. The grid causes the transparency to be broken up into a plurality of diffraction patterns. When the image is reconstructed in the output plane, there is a marked decrease in the localization of reflection noise which would otherwise have been caused by the system.
Inventors
- 👤 Gerald B Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G03; G03H; G03H1/00; G03H1/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A coherent optical processor comprising an input transparency containing information, a source of coherent light for illuminating said input transparency, a lens system for transmitting the information contained on said input transparency to an output plane of said lens system, said lens system causing reflections which become bothersome reflection noise, a diffracting two-dimensional line grid for reducing the localization of said reflection noise in said output plane caused by said reflections in said lens system whereby the quality of said transmitted information is improved, said diffracting grid being positioned in such a manner that the light incident upon the input transparency is bRoken into a plurality of diffraction patterns; and means for translating the grid in one direction whereby any dots which are caused by the grid to appear in the output image are substantially removed.
Claim 2
Dependent Claim
136 words
A coherent optical processor comprising an input transparency containing information, a source of coherent light for illuminating said input transparency, a lens system for transmitting the information contained on said input transparency to an output plane of said lens system, said lens system causing reflections which become bothersome reflection noise, a diffracting two-dimensional line grid for reducing the localization of said reflection noise in said output plane caused by said reflections in said lens system whereby the quality of said transmitted information is improved, said diffracting grid being positioned in such a manner that the light incident upon the input transparency is bRoken into a plurality of diffraction patterns; and means for translating the grid in one direction whereby any dots which are caused by the grid to appear in the output image are substantially removed.
Claim 3
Dependent Claim
23 words
The coherent optical processor of claim 1, wherein the diffracting grid is positioned between said source of coherent light and said input transparency.
Claim 4
Dependent Claim
21 words
The coherent optical processor of claim 1, wherein the diffracting grid is positioned between said input transparency and said lens system.
Claim 5
Dependent Claim
26 words
The coherent optical processor of claim 2, wherein the diffracting grid is a grid comprised of a plurality of parallel, equally spaced horizontal and vertical wires.
Claim 6
Dependent Claim
25 words
The coherent optical processor of claim 1, wherein the translating means comprises a kinematic mount which allows vibration of said grid in a horizontal direction.
Claim 7
Dependent Claim
151 words
A coherent optical processor comprising an input transparency containing information, a source of coherent light for illuminating said input transparency, a lens system for transmitting the information contained on said input transparency to an output plane of said lens system, said lens system causing reflections which become bothersome reflection noise, a diffracting two-dimensional line grid for reducing the localization of said reflection noise in said output plane caused by said reflections in said lens system whereby the quality of said transmitted information is improved, said diffracting screen being positioned in such a manner that the light incident upon the input transparency is broken into a plurality of diffraction patterns; and means for translating the image of the grid in one direction, said means for translating comprising a movable prism positioned after the grid whereby any dots which are caused by the grid to appear in the output image are substantially removed.
Claim 8
Dependent Claim
151 words
A coherent optical processor comprising an input transparency containing information, a source of coherent light for illuminating said input transparency, a lens system for transmitting the information contained on said input transparency to an output plane of said lens system, said lens system causing reflections which become bothersome reflection noise, a diffracting two-dimensional line grid for reducing the localization of said reflection noise in said output plane caused by said reflections in said lens system whereby the quality of said transmitted information is improved, said diffracting screen being positioned in such a manner that the light incident upon the input transparency is broken into a plurality of diffraction patterns; and means for translating the image of the grid in one direction, said means for translating comprising a movable prism positioned after the grid whereby any dots which are caused by the grid to appear in the output image are substantially removed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |