US4867850A
Expired / Lapsed
US
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Thermal detectors and process for manufacturing the same
Assignee: Shimadzu Corp
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Filing: 1987-12-15
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Granted: 1989-09-19
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Expires: 2007-12-15
Abstract
Abstract Thermal detectors comprising at least one pair of membrane electrodes formed on a base material (such a pyroelectric, semiconductive and insulating materials), wherein at least one member of said pair of electrodes is covered with a black membrane of precious metal formed by the electrolytic process, are highly sensitive because of the excellent heat absorption efficiency, with little change in sensitivity over a wide wavelength range.
Inventors
- 👤 Syotaro Oka
- 👤 Junichi Kita
- 👤 Hiroki Kuyama
- 👤 Motosada Kiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:55
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/34; H; H10; H10N; H10N15/00; H10N15/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A thermal detector comprising at least one pair of membrane electrodes formed on a base material, wherein at least one member of said pair of electrodes is covered with a black membrane of a precious metal formed by an electrolytic process, said black membrane having fine surface unevenness such that each protruded area has a pitch of about 3 to about 7 μm.
Claim 2
Dependent Claim
63 words
A thermal detector comprising at least one pair of membrane electrodes formed on a base material, wherein at least one member of said pair of electrodes is covered with a black membrane of a precious metal formed by an electrolytic process, said black membrane having fine surface unevenness such that each protruded area has a pitch of about 3 to about 7 μm.
Claim 3
Dependent Claim
21 words
The thermal detector as defined in claim 1 wherein the base material is made of a pyroelectric, semiconductive or insulating material.
Claim 4
Dependent Claim
18 words
The thermal detector as defined in claim 1 wherein the base material is made of a pyroelectric material.
Claim 5
Dependent Claim
56 words
The thermal detector as defined in claim 3, wherein the pyroelectric material is a ceramic material selected from the group consisting of Sr 1-x Ba x Nb 2 O 6 , Pb 5 Ge 3 O 11 , triglycine sulfate and its analogues, PbTiO 3 , PbTi x Zr 1-x O 3 and LiTaO 3 .
Claim 6
Dependent Claim
25 words
The thermal detector as defined in claim 1 wherein the black membrane of precious metal is gold black, platinum black, palladium black or iridium black.
Claim 7
Dependent Claim
29 words
The thermal detector as defined in claim 1 wherein the thickness of the black membrane of precious metal is in the range from about 2 to about 50 μm.
Claim 8
Dependent Claim
45 words
The thermal detector as defined in claim 1 wherein the black membrane of precious metal has been formed by the electrolytic process with the potential of substrate membrane electrode being set at level in the range from about -0.2 to about -0.8 V (vs. Ag/AgCl).
Claim 9
Dependent Claim
57 words
The thermal detector as defined in claim 7 wherein the potential of precious metal membrane is initially set at a level in the range from about -0.4 to -0 7 V (vs Ag/AgCI) and then changed to a level in the level in the range from about -0.2 to -0.4 V (vs. Ag/AgCl) in the later stage.
Claim 10
Dependent Claim
22 words
The thermal detector as defined in claim 1, wherein the membrane electrodes are deposited with a film of gold, platinum, or chromium.
Claim 11
Dependent Claim
26 words
The thermal detector as defined in claim 1 wherein the thickness of the membrane electrodes is in the range from about 0.1 to about 1.0 μm.
Claim 12
Dependent Claim
16 words
The thermal detector as defined in claim 3, wherein the pyroelectric material is an organic compound.
Claim 13
Dependent Claim
15 words
The thermal detector as defined in claim 11, wherein said organic compound is polyvinylidene fluoride.
Claim 14
Dependent Claim
19 words
The thermal detector as defined in claim 9, wherein the membrane electrodes are deposited with a film of nickel-chromium.
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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |