Patent US765412A successfully refreshed from Google Patents.
US3562425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image signal generating system
Assignee: Thales SA
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Filing: 1967-08-02
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Granted: 1971-02-09
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Expires: 1987-08-02
Abstract
Abstract A metal oxide semiconductor photosensitive capacitor, which comprises a negatively biased metal layer, deposited on a layer of insulating material transparent to photons. This latter layer rests on a layer of doped semiconductor material, which has an ohmic contact. A load resistance connects this contact to ground. Said load collects the current flowing across the diode during negative pulses canceling the biasing. The intensity of this current is a linear function of the photon flux received by the capacitor.
Inventors
- 👤 Raymond Poirier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:22
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/18; H04; H04N; H04N25/00; H04N25/70; H04N25/76
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A metal oxide semiconductor photosensitive device, comprising at least one metal oxide semiconductor capacitor having three layers including a first layer of doped semiconductor of a predetermined type of conductivity, a second layer of insulating material covering partly said first layer, and a third layer made of conductive material, covering at least partly said second layer; an ohmic contact on said first layer; means for biasing said third layer with respect to ground; means for applying between said third layer and said contact short pulses, canceling said biasing; and means connected to said ohmic contact for collecting the current flowing through said capacitor during said pulse upon illumination of said capacitor.
Claim 2
Dependent Claim
111 words
A metal oxide semiconductor photosensitive device, comprising at least one metal oxide semiconductor capacitor having three layers including a first layer of doped semiconductor of a predetermined type of conductivity, a second layer of insulating material covering partly said first layer, and a third layer made of conductive material, covering at least partly said second layer; an ohmic contact on said first layer; means for biasing said third layer with respect to ground; means for applying between said third layer and said contact short pulses, canceling said biasing; and means connected to said ohmic contact for collecting the current flowing through said capacitor during said pulse upon illumination of said capacitor.
Claim 3
Dependent Claim
13 words
A photosensitive device as claimed in claim 1, comprising a plurality of capacitors.
Claim 4
Dependent Claim
58 words
A photosensitive device as claimed in claim 2, wherein said capacitors are arranged to form a matrix with a plurality of lines and a plurality of columns, said third layers of the capacitors of the same column being electrically connected; said ohmic contacts of each line being connected and means for collecting the current flowing in each line.
Claim 5
Dependent Claim
23 words
A device as claimed in claim 3, wherein said collecting means comprise load resistances respectively connected between said ohmic contacts and the ground.
Claim 6
Dependent Claim
41 words
A device as claimed in claim 3, wherein said pulse applying means comprise a pulse generator having an output, a delay line having an input connected to said output and a plurality of outputs respectively connected to said plurality of columns.
Claim 7
Dependent Claim
58 words
A device as claimed in claim 4, wherein said current collecting means comprise an amplifier having a input, a switching device having an output connected to said input of said amplifier and a inputs respectively connected to said plurality of load resistances, and means for successively connecting said plurality of inputs to said output of said switching means.
Claim 8
Dependent Claim
36 words
A device as claimed in claim 2, wherein said ohmic contact comprises a groove extending through said first layer, said third layer comprising two strips extending parallel to said groove, on each side of said groove.
Claim 9
Dependent Claim
34 words
A device as claimed in claim 7, wherein said groove has a center part, an insulating layer covering said center part, a third strip extending on said insulating layer and connecting said two strips.
Claim 10
Dependent Claim
27 words
A device as claimed in claim 8, in which said plurality of capacitors are integrated in the same substrate and form a matrix having lines and columns.
Claim 11
Dependent Claim
31 words
A device as claimed in claim 9, wherein the capacitors of the same column have in common the same groove, said capacitors of the same line having in common said strip.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |