US3947189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical data projection device
Assignee: Thales SA
•
Filing: 1974-07-23
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Granted: 1976-03-30
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Expires: 1994-07-23
Abstract
Abstract An optical device for concentrating in a plane a radiation modulated by an object, carrying data. It comprises a mask splitting an incident beam into a plurality of elementary beams, and two stigmatic systems, the first of which for focussing and the second for converging the elementary beams into a predetermined zone, which is the image of the source of the incident beam; the modulating object comprises elementary zones bearing said data, these zones being arranged in the path of the elementary beams.
Inventors
- 👤 Jean Pierre Huignard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G03; G03H; G03H1/00; G03H1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
An optical data projection device comprising: an entry plane; a light source, capable of occupying a plurality of positions in said entry plane, said light source furnishing an incident beam of radiant energy; an object plane arranged in the path of said incident beam; a frame lying in said object plane for receiving a modulator object carrying said data; an exit plane arranged for receiving said radiant energy upon being transmitted across said frame; and stigmatic imaging means positioned between said entry plane and said exit plane for optically conjugating said entry plane and said exit plane; said stigmatic imaging means comprising two successive stigmatic optical systems separated from one another by a focussing intermediate plane, the first of said stigmatic optical systems optically conjugating said entry plane and said focussing intermediate plane; and the second of said stigmatic optical systems optically conjugating said focussing intermediate plane and said exit plane.
Claim 2
Dependent Claim
151 words
An optical data projection device comprising: an entry plane; a light source, capable of occupying a plurality of positions in said entry plane, said light source furnishing an incident beam of radiant energy; an object plane arranged in the path of said incident beam; a frame lying in said object plane for receiving a modulator object carrying said data; an exit plane arranged for receiving said radiant energy upon being transmitted across said frame; and stigmatic imaging means positioned between said entry plane and said exit plane for optically conjugating said entry plane and said exit plane; said stigmatic imaging means comprising two successive stigmatic optical systems separated from one another by a focussing intermediate plane, the first of said stigmatic optical systems optically conjugating said entry plane and said focussing intermediate plane; and the second of said stigmatic optical systems optically conjugating said focussing intermediate plane and said exit plane.
Claim 3
Dependent Claim
108 words
A device as claimed in claim 1, wherein said entry plane is substantially parallel to said exit plane; each of said stigmatic optical systems being constituted by a planar matrix arrangement of adjacent, convergent lenses having the same focal length; said planar matrix arrangement being substantially parallel to said entry and exit planes said stigmatic imaging means including a plurality of similar elementary imaging channels; each of said elementary imaging channels having an axis substantially at right angle to said entry and exit planes, and being constituted by aligning one lens pertaining to said first stigmatic optical system with one lens pertaining to said second stigmatic optical system.
Claim 4
Dependent Claim
74 words
A device as claimed in claim 1, wherein said stigmatic optical systems are constituted by a matrix arrangement of optical fiber members having a non-uniform refractive index; the optical axes of said optical fiber members being arranged substantially at right - angle to said entry and exit planes; each of said optical fiber members extending symmetrically on each side of said focussing intermediate plane for respectively forming said first and second stigmatic optical systems.
Claim 5
Dependent Claim
63 words
A device as claimed in claim 2, further comprising a mask arranged in one focal plane of said stigmatic optical systems; said mask being constituted by an opaque screen substantially parallel to said entry plane and comprising openings in the neighbourhood of the axes of said elementary imaging channels; said mask splitting said incident beam into elementary beams having a common phase centre.
Claim 6
Dependent Claim
63 words
A device as claimed in claim 3, further comprising a mask arranged in one focal plane of said stigmatic optical systems; said mask being constituted by an opaque screen substantially parallel to said entry plane and comprising openings in the neighbourhood of the axes of said optical fiber members; said mask splitting said incident beam into elementary beams having a common phase centre.
Claim 7
Dependent Claim
21 words
A device as claimed in claim 4, wherein said mask is positioned between said entry plane and said stigmatic imaging means.
Claim 8
Dependent Claim
21 words
A device as claimed in claim 5, wherein said mask is positioned between said entry plane and said stigmatic imaging means.
References Cited (Backward Citations)
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US3437804A
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US3515452A
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US3658414A
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US3692380A
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |