Patent US3711718A successfully refreshed from Google Patents.
US3711718A
Expired / Lapsed
US
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Apparatus for detecting infrared radiation
Assignee: Siemens AG
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Filing: 1970-12-02
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Granted: 1973-01-16
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Expires: 1990-12-02
Abstract
Abstract An apparatus for detecting radiation and a change in position of the radiation source movable along a path has a radiationsensitive electronic semiconductor. A bridge circuit having resistances is formed from the semiconductor and these resistances are grouped into two pairs of mutually adjacent resistances. Two of the resistances, one from each of the pairs, have respective elongated surface portions disposed one adjacent the other along a common line. The surface portions jointly cover the range over which the radiation source is movable. The apparatus is positionable to have the surfaces face the radiation so that the line is substantially parallel to the path over which the radiation source is movable.
Inventors
- 👤 B Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:38
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/783
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
Apparatus for detecting radiation and a change in position of a radiation source, said apparatus comprising a monolithic crystal semiconductor body having two pairs of radiationsensitive resistances formed therein and connected in opposition in a bridge circuit, at least two of the opposing resistances functioning as radiation receivers, and being positioned in parallel and closely adjacent each other in the direction of movement of the radiation source, each of the resistances having receiving surfaces which extend in the direction of displacement of the radiation source, the resistances being stationary in position relative to radiation from the radiation source, the resistances having a central point therebetween, and said bridge circuit having output means producing aN output signal which is directly proportional to the deviation of impinging radiation from the central point, said output signal having a polarity which is dependent upon the direction of the deviation.
Claim 2
Dependent Claim
145 words
Apparatus for detecting radiation and a change in position of a radiation source, said apparatus comprising a monolithic crystal semiconductor body having two pairs of radiationsensitive resistances formed therein and connected in opposition in a bridge circuit, at least two of the opposing resistances functioning as radiation receivers, and being positioned in parallel and closely adjacent each other in the direction of movement of the radiation source, each of the resistances having receiving surfaces which extend in the direction of displacement of the radiation source, the resistances being stationary in position relative to radiation from the radiation source, the resistances having a central point therebetween, and said bridge circuit having output means producing aN output signal which is directly proportional to the deviation of impinging radiation from the central point, said output signal having a polarity which is dependent upon the direction of the deviation.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1, said resistances being grouped in two groups of mutually opposite resistances, the resistances of each of said groups being at least substantially parallel, said two groups being disposed closely adjacent each other along a common line.
Claim 4
Dependent Claim
45 words
Apparatus according to claim 1, said resistances being formed from a semiconductor of a first crystalline phase, said semiconductor being made of a AIII BV- semiconductor material having inclusions of a second crystalline phase, said inclusions having an electrical conductivity higher than said first phase.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 1, said resistances being formed from a semiconductor body of lead sulfide (PbS).
Claim 6
Dependent Claim
26 words
Apparatus according to claim 1, further comprising a base plate having a groove, said resistances being disposed on said plate and extending unsupported over said groove.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 1, further comprising connecting portions for respectively connecting said resistances to form said bridge circuit, said resistances and said connecting portions being formed from a monolithic crystal of the semiconductor.
Claim 8
Dependent Claim
29 words
Apparatus according to claim 1, further comprising a metal layer on said semiconductor, said metal layer having openings at said resistances to permit radiation to impinge upon the latter.
Claim 9
Dependent Claim
29 words
Apparatus according to claim 6, further comprising a metal layer on said semiconductor, said metal layer having openings at said resistances to permit radiation to impinge upon the latter.
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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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |