US4425504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bolometric detector
Assignee: US Philips Corp
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Filing: 1981-07-08
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Granted: 1984-01-10
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Expires: 2001-07-08
Abstract
Abstract A bolometric detector comprising an optical immersion lens and a pyroelectric detector element mounted so as to be spaced from the lens. The detector may be mounted spaced from the lens by an air gap, by a foraminous spacer, or by a cement having a low thermal conductivity.
Inventors
- 👤 Andrew A. Turnbull
- 👤 Raymond F. Hall
- 👤 Colin D. Overall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:07
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/0215; G01J5/022; G01J5/08; G01J5/0803; G01J5/0806; G01J5/10; G01J5/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A bolometric detector for detecting radiation of a specified wavelength range comprising: an optical immersion lens having a plane surface; a substantially rigid substrate; means for clamping the substrate to the lens; a pyroelectric detector element, mounted on the substrate by way of a layer of resilient material disposed between the detector element and the substrate, said detector element being disposed between the plane surface of the lens and the substrate; and foraminous spacing means disposed between the pyroelectric detector element and the plane surface of the lens.
Claim 2
Dependent Claim
88 words
A bolometric detector for detecting radiation of a specified wavelength range comprising: an optical immersion lens having a plane surface; a substantially rigid substrate; means for clamping the substrate to the lens; a pyroelectric detector element, mounted on the substrate by way of a layer of resilient material disposed between the detector element and the substrate, said detector element being disposed between the plane surface of the lens and the substrate; and foraminous spacing means disposed between the pyroelectric detector element and the plane surface of the lens.
Claim 3
Dependent Claim
18 words
A bolometric detector as claimed in claim 1, characterized in that the immersion lens is a germanium hemisphere.
Claim 4
Dependent Claim
26 words
A bolometric detector as claimed in claim 2, characterized in that the pyroelectric detector element comprises a material which absorbs radiation of the specified wavelength range.
Claim 5
Dependent Claim
36 words
A bolometric detector as claimed in claim 3, characterized in that the foraminous spacing means is approximately 0.3 microns so as to space the detector element approximately 0.3 microns from the plane surface of the lens.
References Cited (Backward Citations)
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Cited
US3161772A
Cited
US3239675A
Cited
US3368078A
Cited
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Cited
US4024397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |