US3774043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera system utilising a pyroelectric target
Assignee: Thales SA
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Filing: 1972-04-12
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Granted: 1973-11-20
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Expires: 1992-04-12
Abstract
Abstract In camera systems utilising pyroelectric targets periodically masked to the incident radiation by means of a shutter and alternately scanned with a slow read-out electron beam and a fast electron beam, the invention adds an element for ensuring a second slow electron scanning after the end of the fast electron scanning and up to the commencement of that phase of the shutter cycle during which the slow read-out electron scanning takes place.
Inventors
- 👤 Carvennec F Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:45
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/49
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A camera system comprising a pyroelectric target exposed to incident radiation and read out by being scanned by a beam of slow read-out electrons, said scanning alternating with scanning by a fast electron beam in an alternation regulated in accordance with the cycle of a shutter arranged in front of the target and masking same from the incident radiation during the obturation phase of said cycle and uncovering it during the open phase, said slow electron scan occuring in one of said phases and the fast electron scan in the other, characterized in that means are provided to effect a second slow electron scan of said target after the end of the fast electron scan at least up to the commencement of that period of the shutter cycle during which the slow electron scan for read-out purposes takes place.
Claim 2
Dependent Claim
139 words
A camera system comprising a pyroelectric target exposed to incident radiation and read out by being scanned by a beam of slow read-out electrons, said scanning alternating with scanning by a fast electron beam in an alternation regulated in accordance with the cycle of a shutter arranged in front of the target and masking same from the incident radiation during the obturation phase of said cycle and uncovering it during the open phase, said slow electron scan occuring in one of said phases and the fast electron scan in the other, characterized in that means are provided to effect a second slow electron scan of said target after the end of the fast electron scan at least up to the commencement of that period of the shutter cycle during which the slow electron scan for read-out purposes takes place.
Claim 3
Dependent Claim
29 words
A camera system as claimed in claim 1, characterized in that the slow electron scan for read-out purposes is split up into several elementary scanning periods separated by intervals.
Claim 4
Dependent Claim
48 words
A camera system as claimed in claim 1, characterized in that said means consist of a switch connected in the supply circuit of said electron beams, and comprising three positions respectively corresponding to the slow read-out electron beam the fast electron beam and the second slow electron beam.
Claim 5
Dependent Claim
16 words
A camera system as claimed in claim 1 wherein said incident radiation in an infra-red radiation.
Claim 6
Dependent Claim
28 words
The camera system as claimed in claim 1 characterized in that the fast electron scan for read-out purposes is split into several elementary scanning periods separated by intervals.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |