US4158133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filters for photo-detectors
Assignee: Siemens AG
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Filing: 1977-08-16
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Granted: 1979-06-12
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Expires: 1997-08-16
Abstract
Abstract Optical filters are directly mounted on the surface of photo-detectors. The filters have maximum radiation permeability for the operating range of the photo-detector. For that region of the spectrum which lies outside of the operating range, the filters are of maximum impermeability and considerably decrease interfering currents resulting from the incidence of foreign light. The direct mounting of the filters on the detector surface effects not only technical but also economical advantages.
Inventors
- 👤 Werner Spaeth
- 👤 Laszlo Bacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:16
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/288; H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/331; H10F77/337
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
122 words
A photo-detector for sensing light in a narrow spectral range, comprising: a semiconductor body of first conductivity type having a region of second conductivity type doped into the semiconductor body at a major surface; a metal contact connected to said region of second conductivity type; at least one filtering layer means directly adhering to the major surface of the semiconductor body and covering at least a portion of said region of second conductivity type, said layer means being permeable to a narrow spectral range of electromagnetic radiation and impermeable to adjacent spectral ranges; and said filtering layer means comprising a Perot-Fabry filter consisting of alternating silicon and silicon-dioxide layers, one of said alternating layers being in direct contact with the major surface.
Claim 2
Dependent Claim
122 words
A photo-detector for sensing light in a narrow spectral range, comprising: a semiconductor body of first conductivity type having a region of second conductivity type doped into the semiconductor body at a major surface; a metal contact connected to said region of second conductivity type; at least one filtering layer means directly adhering to the major surface of the semiconductor body and covering at least a portion of said region of second conductivity type, said layer means being permeable to a narrow spectral range of electromagnetic radiation and impermeable to adjacent spectral ranges; and said filtering layer means comprising a Perot-Fabry filter consisting of alternating silicon and silicon-dioxide layers, one of said alternating layers being in direct contact with the major surface.
Claim 3
Dependent Claim
98 words
A filtered photo-detector comprising: a photo-detector having a light receiving surface; and a filter means comprising at least one layer directly applied to the receiving surface and a metal contact arranged on the semiconductor surface and passing through the filter means, said filter means being permeable to a spectral range of electromagnetic radiation including an infrared wavelength which lies in an operating range of the photo-detector, said filter means being largely impermeable to other spectral ranges, and said filter means comprising a Perot-Fabry interference filter means having alternating layers of silicon (Si) and Silicon dioxide (SiO 2 ).
Claim 4
Dependent Claim
98 words
A filtered photo-detector comprising: a photo-detector having a light receiving surface; and a filter means comprising at least one layer directly applied to the receiving surface and a metal contact arranged on the semiconductor surface and passing through the filter means, said filter means being permeable to a spectral range of electromagnetic radiation including an infrared wavelength which lies in an operating range of the photo-detector, said filter means being largely impermeable to other spectral ranges, and said filter means comprising a Perot-Fabry interference filter means having alternating layers of silicon (Si) and Silicon dioxide (SiO 2 ).
Claim 5
Dependent Claim
16 words
A photo-detector as claimed in claim 2 in which said filter means comprises double Perot-Fabry filters.
Claim 6
Dependent Claim
16 words
A photo-detector as claimed in claim 2 in which said filter means comprises multiple Perot-Fabry filters.
Claim 7
Dependent Claim
17 words
A photo-detector as claimed in claim 2 in which said filter means includes an additional absorption filter.
Claim 8
Dependent Claim
15 words
A photo-detector as claimed in claim 5 in which the absorption filter comprises inorganic substances.
Claim 9
Dependent Claim
15 words
A photo-detector as claimed in claim 5 in which the absorption filter comprises organic substances.
Claim 10
Dependent Claim
16 words
A photo-detector as claimed in claim 5 in which said filter means comprises an edge filter.
Claim 11
Dependent Claim
16 words
A photo-detector as claimed in claim 2 in which said filter means comprises an edge filter.
Claim 12
Dependent Claim
30 words
A photo-detector as claimed in claim 2 in which said filter means is deposited on an entire surface of a semiconductor wafer and the wafer is divided into individual photo-detectors.
Claim 13
Dependent Claim
21 words
A photo-detector as claimed in claim 2 in which said filter means operating range includes a wavelength of approximately 950 nm.
Claim 14
Dependent Claim
20 words
A photo-detector as claimed in claim 2 in which the Perot-Fabry filter means includes only silicon and silicon dioxide layers.
Claim 15
Dependent Claim
25 words
A photo-detector as claimed in claim 2 in which one of said silicon and silicon dioxide layers is in direct contact with the receiving surface.
References Cited (Backward Citations)
US3076861A
Cited
US3247392A
Cited
US3528726A
Cited
US3649359A
Cited
US3743847A
Cited
US3929398A
Cited
US3781090A
Cited
US3949463A
Cited
US3996461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |