US3928768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal imaging tube having a pyroelectric target and annular potential stabilizing electrode
Assignee: Philips North America LLC
•
Filing: 1974-09-09
•
Granted: 1975-12-23
•
Expires: 1994-09-09
Abstract
Abstract A pyroelectric vidicon having an annular metal electrode on the beam side of the target for maintaining the perimeter of the target at a fixed potential.
Inventors
- 👤 Merton H Crowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:32
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/458; H01J31/00; H01J31/08; H01J31/49
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
A thermal imaging tube comprising an evacuated envelope, an electron gun within said envelope for producing an electron beam, a thermally responsive target of pyroelectric material positioned at one end of said tube to receive said electron beam on one surface thereof and a thermal image on the opposite face thereof for producing a potential image corresponding to said thermal image which can be scanned by said electron beam, an annular conductive member encircling the periphery of said target on the side facing the electron beam, means to apply a potential to said target at which said beam lands on said target, and means to apply a potential to said annular member which is not greater than the potential applied to the target and at which positive electrical charge build-up at the periphery of said target is prevented and said target is capable of being polled from an external source.
Claim 2
Dependent Claim
150 words
A thermal imaging tube comprising an evacuated envelope, an electron gun within said envelope for producing an electron beam, a thermally responsive target of pyroelectric material positioned at one end of said tube to receive said electron beam on one surface thereof and a thermal image on the opposite face thereof for producing a potential image corresponding to said thermal image which can be scanned by said electron beam, an annular conductive member encircling the periphery of said target on the side facing the electron beam, means to apply a potential to said target at which said beam lands on said target, and means to apply a potential to said annular member which is not greater than the potential applied to the target and at which positive electrical charge build-up at the periphery of said target is prevented and said target is capable of being polled from an external source.
Claim 3
Dependent Claim
29 words
A thermal imaging tube as claimed in claim 1 in which the surface of said target facing the electron beam is covered with a layer of electrically resistive material.
References Cited (Backward Citations)
US2999177A
Cited
US2900569A
Cited
US3054917A
Cited
US3259791A
Cited
US3278783A
Cited
US3774043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |