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US4480899A
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Two dimensional electro-optic modulator and applications therefor
Assignee: Xerox Corp
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Filing: 1981-10-08
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Granted: 1984-11-06
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Expires: 2001-10-08
Abstract
Abstract A two dimensional electro-optic modulator comprises an electro-optic element and a two dimensional planar array of individually addressable electrodes for spatially modulating a light beam along a plurality of transverse axes or for imparting a geometric phase front to the light beam. Such a modulator may be used, for example, (1) in a real time or in a time delay and integration mode as a multigate light valve for (a) electro-optic line printing or (b) optical displays, or (2) in a real time mode as (a) a beam focusing and tracking device for optical memories or (b) an areal input device, a Fourier plane filter, or an image plane correlation mask for optical processing.
Inventors
- 👤 Robert A. Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:20
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/19; H04N1/195; H04N1/19505; H04N1/19515; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305; G02F1/0316; G02F1/29; G02F1/31; G02F1/315; H04N1/024; H04N1/032; H04N1/036; H04N1/19521; H04N1/19526; H04N1/19531; H04N1/19547; H04N1/19573
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
An electro-optic modulator for spatially modulating a light beam essentially simultaneously in two dimensions in accordance with input voltages, said modulator comprising an electro-optic element, and a two dimensional planar array of individually addressable electrodes intimately associated with a reflective surface of said electro-optic element for coupling fringe electric fields into said electro-optic element in response to said input voltages, and means for applying a light beam to said modulator at a grazing angle of incidence with respect to the reflective surface of said electro-optic element, said light beam illuminating said surface over an area which is essentially coextensive with said electrode array whereby said light beam is spatially modulated essentially simultaneously in two dimensions in accordance with said input voltages.
Claim 2
Dependent Claim
121 words
An electro-optic modulator for spatially modulating a light beam essentially simultaneously in two dimensions in accordance with input voltages, said modulator comprising an electro-optic element, and a two dimensional planar array of individually addressable electrodes intimately associated with a reflective surface of said electro-optic element for coupling fringe electric fields into said electro-optic element in response to said input voltages, and means for applying a light beam to said modulator at a grazing angle of incidence with respect to the reflective surface of said electro-optic element, said light beam illuminating said surface over an area which is essentially coextensive with said electrode array whereby said light beam is spatially modulated essentially simultaneously in two dimensions in accordance with said input voltages.
Claim 3
Dependent Claim
35 words
The electro-optical modulator of claim 1 wherein said electrode array is a rectilinear array, whereby said light beam is spatially modulated essentially simultaneously along a pair of transverse axes in accordance with said input voltages.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |