US3874785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical deflector arrangement for use in holographic data storage devices
Assignee: Thales SA
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Filing: 1973-05-29
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Granted: 1975-04-01
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Expires: 1993-05-29
Abstract
Abstract The present invention relates to optical data recording and read-out. More particularly, it is concerned with optical deflector arrangements used in holographic storage devices. In accordance with the invention, there is provided an optical deflector arrangement wherein a beam projected onto a storage area can be steered to take n distinct angular position making it possible the selective record or read out of a plurality of elementary holograms superimposed on one another in said area.
Inventors
- 👤 Jean Pierre Huignard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:29
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G02; G02F; G02F1/00; G02F1/29; G02F1/33
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
An optical deflector for electrically steering and focusing a collimated beam of light into a selected area in a predetermined plane having a plurality of selectable areas and at a selected angle of incidence said optical deflector comprising: means for producing a collimated beam of light and for selectively deflecting said beam in one of a plurality of angular directions so as to control the particular area selected in said predetermined plane, a telecentric lens positioned for receiving said collimated beam, said beam having an axis that passes through the front focal point of said telecentric lens, an intermediate lens having an anterior focal plane cOincident with the rear focal plane of said telecentric lens, a projection lens having its rear focal plane coincident with said predetermined plane for focusing onto said selected area the light emerging from said intermediate lens, and electrically controllable optical deflector means positioned in said coincident focal planes of said telecentric and intermediate lenses for controlling the direction of the focused radiant energy incident onto said selected area.
Claim 2
Dependent Claim
173 words
An optical deflector for electrically steering and focusing a collimated beam of light into a selected area in a predetermined plane having a plurality of selectable areas and at a selected angle of incidence said optical deflector comprising: means for producing a collimated beam of light and for selectively deflecting said beam in one of a plurality of angular directions so as to control the particular area selected in said predetermined plane, a telecentric lens positioned for receiving said collimated beam, said beam having an axis that passes through the front focal point of said telecentric lens, an intermediate lens having an anterior focal plane cOincident with the rear focal plane of said telecentric lens, a projection lens having its rear focal plane coincident with said predetermined plane for focusing onto said selected area the light emerging from said intermediate lens, and electrically controllable optical deflector means positioned in said coincident focal planes of said telecentric and intermediate lenses for controlling the direction of the focused radiant energy incident onto said selected area.
Claim 3
Dependent Claim
54 words
Optical deflector as claimed in claim 1, wherein said optical deflector comprise an acousto-optical deflector; the deflection plane of said acousto-optical deflector being parallel to the common optical axis of said telecentric and intermediate lenses; said coincident focal planes being perpendicular to said deflection plane and located inside the body of said acousto-optical deflector.
Claim 4
Dependent Claim
19 words
Optical deflector arrangement as claimed in claim 1, wherein said intermediate and projection lenses have a common focal plane.
Claim 5
Dependent Claim
51 words
An optical deflector as claimed in claim 1 further comprising two further convergent lenses having a common focal plane and another electrically controllable optical deflector means located at said common focal plane, said two further lenses and said another deflector means being arranged between said intermediate lens and said projection lens.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |