US3753247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Array of devices responsive to differential light signals
Assignee: RCA Corp
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Filing: 1971-04-22
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Granted: 1973-08-14
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Expires: 1991-04-22
Abstract
Abstract An array of memory elements is disclosed in which each memory element includes a bistable circuit having a differential input circuit including a pair of spaced photosensors. The bistable circuit is set to one or the other of its two states in accordance with which photosensor of the pair receives the greater amount of input light. The pairs of photosensors are arranged in interlaced herringbone fashion in the array so that every photosensor of a pair is positioned equidistant from the two photosensors of one adjacent pair of photosensors. The memory elements in the array may be densely packed because the effect of input light intended for one photosensor of a pair which may spill over to the equidistant photosensors of the adjacent pair of photosensors is cancelled in the differential input circuit connected to the adjacent pair of photosensors.
Inventors
- 👤 J Rajchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/18; G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/412; G11C13/00; G11C13/04; G11C13/048; H10D; H10D84/00; H10D84/80; H10D84/82; H10D84/83
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
An array of pairs of photosensors, and a differential circuit connected to each pair of photosensors, so that the photosensors of each pair are responsive to a respective differential light signal, the pairs of photosensors being arranged in the array so that every individual photosensor is positioned equidistant from the two photosensors of one adjacent pair of photosensors.
Claim 2
Dependent Claim
58 words
An array of pairs of photosensors, and a differential circuit connected to each pair of photosensors, so that the photosensors of each pair are responsive to a respective differential light signal, the pairs of photosensors being arranged in the array so that every individual photosensor is positioned equidistant from the two photosensors of one adjacent pair of photosensors.
Claim 3
Dependent Claim
35 words
The combination as defined in claim 1 wherein said individual photosensors are arranged in rows and columns, and wherein the two individual photosensors of each pair of photosensors are in different adjacent rows and columns.
Claim 4
Dependent Claim
28 words
The combination as defined in claim 1 whereby half of the photosensor pairs are aligned with one diagonal, and the other half are aligned with the other diagonal.
Claim 5
Dependent Claim
30 words
An array as defined in claim 3 wherein each photosensor pair is aligned with a given diagonal and is surrounded by four photosensor pairs each aligned with the other diagonal.
Claim 6
Dependent Claim
128 words
An array of memory elements each including a bistable circuit having a differential input circuit including a pair of spaced photosensors, so that the bistable circuit is set to one or the other of its two stable states in accordance with which photosensor of the pair receives the greater amount of input light, the pairs of photosensors being arranged in interlaced herringbone fashion in the array so that every photosensor of a pair is positioned equidistant from the two photosensors of one adjacent pair of photosensors, whereby the effect of input light intended for one photosensor of a pair which may spill over to the equidistant photosensors of the adjacent pair of photosensors is cancelled in the differential input circuit of the bistable circuit of the adjacent pair.
Claim 7
Dependent Claim
128 words
An array of memory elements each including a bistable circuit having a differential input circuit including a pair of spaced photosensors, so that the bistable circuit is set to one or the other of its two stable states in accordance with which photosensor of the pair receives the greater amount of input light, the pairs of photosensors being arranged in interlaced herringbone fashion in the array so that every photosensor of a pair is positioned equidistant from the two photosensors of one adjacent pair of photosensors, whereby the effect of input light intended for one photosensor of a pair which may spill over to the equidistant photosensors of the adjacent pair of photosensors is cancelled in the differential input circuit of the bistable circuit of the adjacent pair.
Claim 8
Dependent Claim
26 words
An array of pairs of photosensors, and a differential circuit connected to each pair of photosensors, said pairs of photosensors being arranged in interlaced herringbone fashion.
Claim 9
Dependent Claim
26 words
An array of pairs of photosensors, and a differential circuit connected to each pair of photosensors, said pairs of photosensors being arranged in interlaced herringbone fashion.
Claim 10
Dependent Claim
28 words
An array of photosensors as defined in claim 6 wherein every photosensor of a pair is positioned equidistant from the two photosensors of one adjacent pair of photosensors.
References Cited (Backward Citations)
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |