Patent US3663086A successfully refreshed from Google Patents.
US3663086A
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Optical information storing system
Assignee: Thales SA
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Filing: 1970-06-23
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Granted: 1972-05-16
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Expires: 1990-06-23
Abstract
Abstract An optical information storing system comprises a thin photoconductive film and a thin film of a mixture of nematic liquid crystal and dichroic dye, placed side by side between two transparent electrodes. A direct voltage V is applied between said electrodes. The data to be stored are projected optically onto the photoconductive film with a radiation to which the photoconductor is sensitive. The mixture film is illuminated by an auxiliary radiation which is rectilinearly polarized and has a wavelength corresponding to an optical absorption line of the dichroic dye, the photoconductor being sensitive to this radiation.
Inventors
- 👤 George Assouline
- 👤 Eugene Leiba
- 👤 Erich Spitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/1313; G02F1/133; G02F1/135; G11; G11C; G11C13/00; G11C13/04; G11C13/048
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
An optical information storing system comprising: a first constAnt thickness layer of a mixture of nematic liquid crystal and of a dichroic substance, said substance exhibiting at least one optical absorption line with respect to rectilinearly polarized light; a second constant thickness layer of photoconductive material located against said first layer;two transparent electrodes for enclosing said layers ;first means for coupling said electrodes to a d.c. supply source ; optical means for projecting said optical information onto said photoconductive layer ; and second means for illuminating substantially uniformly said first layer by a beam of polarized light comprising at least a light radiation having a wavelength substantially equal to the wavelength of said absorption line, said photoconductive material being sensitive to radiation from said optical information projecting means and from said second means.
Claim 2
Dependent Claim
133 words
An optical information storing system comprising: a first constAnt thickness layer of a mixture of nematic liquid crystal and of a dichroic substance, said substance exhibiting at least one optical absorption line with respect to rectilinearly polarized light; a second constant thickness layer of photoconductive material located against said first layer;two transparent electrodes for enclosing said layers ;first means for coupling said electrodes to a d.c. supply source ; optical means for projecting said optical information onto said photoconductive layer ; and second means for illuminating substantially uniformly said first layer by a beam of polarized light comprising at least a light radiation having a wavelength substantially equal to the wavelength of said absorption line, said photoconductive material being sensitive to radiation from said optical information projecting means and from said second means.
Claim 3
Dependent Claim
35 words
A system as claimed in claim 1 wherein said second means comprise a substantially monochromatic light source and a polarizer for supplying said beam with a rectilinear polarization in a direction parallel to said electrodes.
Claim 4
Dependent Claim
19 words
A system as claimed in claim 1 wherein at least one transparent insulating layer is located between said electrodes.
Claim 5
Dependent Claim
19 words
A system as claimed in claim 2 wherein at least one transparent insulating layer is located between said electrodes.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |