US4117328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared radiation sensitive image pick-up device
Assignee: US Philips Corp
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Filing: 1977-05-04
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Granted: 1978-09-26
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Expires: 1997-05-04
Abstract
Abstract An infra-red imaging device consisting of two sheets of interconnected disks of piezoelectric material, at least one of which has a ferroelectric transition temperature. A metal foil is provided between the sheets and mutually parallel, conductive strips are provided on both outer surfaces of the assembly thus formed, the direction of the strips on the one surface differing from that of the strips on the other surface. A generator for periodic signals which can be sequentially connected to each strip on one of the surfaces of the first sheet generates therein, via a piezoelectric effect, ultrasonic vibrations which are intercepted by the other sheet which converts these vibrations into electric signals. These signals are amplified and carry the image to be examined.
Inventors
- 👤 Michel Joseph Auphan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:12
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/49; H04; H04N; H04N23/00; H04N23/20; H10; H10N; H10N15/00; H10N15/10; H10N19/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
An infrared imaging device comprising first and second piezoelectric sheets of material each having a ferroelectric transition temperature for storing thermal information, means for point-wise reading said thermal image by point-wise conversion into electric readout signals, and means for exciting said piezoelectric material without loss of the piezoelectric properties thereof including a first strip electrode comprising parallel strips of electrically conductive material on one surface of said first sheet, means connecting said strips sequentially to an electrical pulse generator for introducing piezoelectrically stimulated ultrasonic vibrations in said first sheet, an electrically conductive foil on the other surface of said sheet, means to maintain said foil at a fixed electric potential, the second sheet of piezoelectric material being positioned parallel to the said foil and supporting on the surface remote from the first sheet a second strip electrode having strips in a direction differing from the direction of the strips of the first strip electrode, said strips being connected to a network comprising means for signal detection.
Claim 2
Dependent Claim
166 words
An infrared imaging device comprising first and second piezoelectric sheets of material each having a ferroelectric transition temperature for storing thermal information, means for point-wise reading said thermal image by point-wise conversion into electric readout signals, and means for exciting said piezoelectric material without loss of the piezoelectric properties thereof including a first strip electrode comprising parallel strips of electrically conductive material on one surface of said first sheet, means connecting said strips sequentially to an electrical pulse generator for introducing piezoelectrically stimulated ultrasonic vibrations in said first sheet, an electrically conductive foil on the other surface of said sheet, means to maintain said foil at a fixed electric potential, the second sheet of piezoelectric material being positioned parallel to the said foil and supporting on the surface remote from the first sheet a second strip electrode having strips in a direction differing from the direction of the strips of the first strip electrode, said strips being connected to a network comprising means for signal detection.
Claim 3
Dependent Claim
30 words
A device as claimed in claim 1, wherein a disk-shaped substrate of insulating material is provided between one of the sheets of piezoelectric material and the foil of conductive material.
Claim 4
Dependent Claim
29 words
A device as claimed in claim 1, wherein the device is secured to a substrate of insulating material with an adhesive, the said substrate acting as a mechanical support.
Claim 5
Dependent Claim
21 words
A device as claimed in claim 1, wherein at least one of the sheets of piezoelectric material consists of triglycine sulphate.
Claim 6
Dependent Claim
29 words
A device as claimed in claim 1, wherein the first parallel strips of conductive material enclose an angle of approximately 90° with the second parallel strips of conductive material.
Claim 7
Dependent Claim
32 words
A device as claimed in claim 1, wherein grooves are provided in the surface of at least one of the sheets of piezoelectric material between each pair of strips of conductive material.
References Cited (Backward Citations)
US3772518A
Cited
US3946264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |