US4060729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyroelectric detector with decreased susceptibility to vibrational noise
Assignee: Lockheed Martin Corp
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Filing: 1976-12-10
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Granted: 1977-11-29
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Expires: 1996-12-10
Abstract
Abstract Pyroelectric thermal detector with decreased susceptibility to vibrational noise is formed of a wafer of pyroelectric material having a thin central region supported and surrounded by a thicker rim. On the central region deposited electrodes define active detecting regions that are mirror images of each other across a line separating them. The active regions may be oppositely polarized domains electrically connected in parallel, or a continuous domain with the active regions electrically connected in series opposition. The deposited electrodes are brought out to the rim for external connection. The rim is everywhere spaced at least one thermal diffusion length from either active region. Mechanical support for the wafer is connected to the rim, is symmetrically disposed with respect to the line separating the active detecting regions, and is in contact with the rim over at least 75 percent of its linear extent.
Inventors
- 👤 Norman E. Byer
- 👤 Stanley E. Stokowski
- 👤 John D. Venables
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:39
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/34; H; H10; H10N; H10N15/00; H10N15/10; H10W; H10W72/00; H10W72/50; H10W72/531; H10W72/536
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
89 words
A radiation detector comprising: an integral wafer of pyroelectric material, said wafer comprising a relatively thin central region of substantially uniform thickness surrounded by a supporting rim having a thickness many times greater than said central region: electrodes deposited on both surfaces of said central region defining between them at least one active detecting region; external electrical connections to said electrodes being located on said rim on extensions of said electrodes beyond said active detecting region or regions; and supporting means for said wafer attached only to said rim.
Claim 2
Dependent Claim
89 words
A radiation detector comprising: an integral wafer of pyroelectric material, said wafer comprising a relatively thin central region of substantially uniform thickness surrounded by a supporting rim having a thickness many times greater than said central region: electrodes deposited on both surfaces of said central region defining between them at least one active detecting region; external electrical connections to said electrodes being located on said rim on extensions of said electrodes beyond said active detecting region or regions; and supporting means for said wafer attached only to said rim.
Claim 3
Dependent Claim
20 words
A radiation detector in accordance with claim 1 wherein said central region has a thickness of less than 30 micrometers.
Claim 4
Dependent Claim
46 words
A radiation detector in accordance with claim 1 wherein all portions of said active detecting region or regions are spaced from the nearest point of said rim at least one thermal diffusion length at the lowest modulation frequency at which the detector is to be used.
Claim 5
Dependent Claim
20 words
A radiation detector in accordance with claim 3 wherein said central region has a thickness of less than 30 micrometers.
Claim 6
Dependent Claim
28 words
A radiation detector in accordance with claim 1 wherein said wafer supporting means makes continuous contact with said rim over more than 75 percent of its linear extent.
Claim 7
Dependent Claim
20 words
A radiation detector in accordance with claim 5 wherein said central region has a thickness of less than 30 micrometers.
Claim 8
Dependent Claim
46 words
A radiation detector in accordance with claim 6 wherein all portions of said active detecting region or regions are spaced from the nearest point of said rim at least one thermal diffusion length at the lowest modulation frequency at which the detector is to be used.
Claim 9
Dependent Claim
64 words
A radiation detector comprising: a wafer of pyroelectric material; electrodes deposited on both surfaces of said wafer defining between then two detecting regions that form mirror images on opposite sides of a line between them; supporting means for said wafer located on portions of said wafer other than said active detecting regions and being disposed symmetrically about said line between said active detecting regions.
Claim 10
Dependent Claim
64 words
A radiation detector comprising: a wafer of pyroelectric material; electrodes deposited on both surfaces of said wafer defining between then two detecting regions that form mirror images on opposite sides of a line between them; supporting means for said wafer located on portions of said wafer other than said active detecting regions and being disposed symmetrically about said line between said active detecting regions.
Claim 11
Dependent Claim
109 words
A radiation detector comprising: an integral wafer of pyroelectric material, said wafer comprising a relatively thin central region of substantially uniform thickness surrounded by a supporting rim having a thickness many times greater than said central region; electrodes deposited on both surfaces of said central region and defining between them two active detecting regions that form mirror images on opposite sides of a line between them; external electrical connections to said electrodes being located on said rim on extensions of said electrodes beyond said active detecting regions; and supporting means for said wafer attached only to said rim and symmetrically disposed about said line between said active detecting regions.
Claim 12
Dependent Claim
109 words
A radiation detector comprising: an integral wafer of pyroelectric material, said wafer comprising a relatively thin central region of substantially uniform thickness surrounded by a supporting rim having a thickness many times greater than said central region; electrodes deposited on both surfaces of said central region and defining between them two active detecting regions that form mirror images on opposite sides of a line between them; external electrical connections to said electrodes being located on said rim on extensions of said electrodes beyond said active detecting regions; and supporting means for said wafer attached only to said rim and symmetrically disposed about said line between said active detecting regions.
Claim 13
Dependent Claim
20 words
A radiation detector in accordance with claim 9 wherein said central region has a thickness of less than 30 micrometers.
Claim 14
Dependent Claim
28 words
A radiation detector in accordance with claim 9 wherein said wafer supporting means makes continuous contact with said rim over more than 75 percent of its linear extent.
Claim 15
Dependent Claim
41 words
A radiation detector in accordance with claim 9 wherein said central region has a thickness of less than 30 micrometers and wherein said wafer supporting means makes continuous contact with said rim over more than 75 percent of its linear extent.
Claim 16
Dependent Claim
44 words
A radiation detector in accordance with claim 9 wherein all portions of said active detecting regions are spaced from the nearest point of said rim at least one thermal diffusion length at the lowest modulation frequency at which the detector is to be used.
Claim 17
Dependent Claim
41 words
A radiation detector in accordance with claim 13 wherein said central region has a thickness of less than 30 micrometers and wherein said wafer supporting means makes continuous contact with said rim over more than 75 percent of its linear extent.
Claim 18
Dependent Claim
27 words
A radiation detector in accordance with claim 13 wherein said two active detecting regions are polarized in the same direction and are electrically connected in series opposition.
Claim 19
Dependent Claim
25 words
A radiation detector in accordance with claim 13 wherein said two active detecting regions are polarized in opposite directions and are electrically connected in parallel.
Claim 20
Dependent Claim
27 words
A radiation detector in accordance with claim 9 wherein said two active detecting regions are polarized in the same direction and are electrically connected in series opposition.
Claim 21
Dependent Claim
25 words
A radiation detector in accordance with claim 9 wherein said two active detecting regions are polarized in opposite directions and are electrically connected in parallel.
References Cited (Backward Citations)
US3985685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |