Patent US3069041A successfully refreshed from Google Patents.
Patent US3637931A successfully refreshed from Google Patents.
US3637931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optic relay for use in television
Assignee: US Philips Corp
•
Filing: 1969-12-02
•
Granted: 1972-01-25
•
Expires: 1989-12-02
Abstract
Abstract An optical relay device with an insulating plate which is ferroelectric below its Curie temperature. The plate is scanned by an electron beam. The plane of polarization of light incident on the plate is variably rotated in dependence upon the electric field created by means of the interaction between the electron beam and a signal voltage applied to the plate, due to the Pockels effect. The temperature of the plate is stabilized in the proximity of its Curie temperature. This stabilizing device uses a capacitor as a temperature sensing element. The dielectric of the capacitor is formed by a material having a Curie temperature differing from that of the plate by between 1* and 20*.
Inventors
- 👤 Jacques Donjon
- 👤 Auguste Raymond Le Pape
- 👤 Gerard Joseph Marcel Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0525; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7425
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
An optical relay device, comprising a plate of electrically insulating material positioned in an optical path between a polarizer and an analyzer, said material consisting of an acid salt which is ferroelectric below the Curie temperature thereof, said material being enriched with deuterium whereby the Curie temperature thereof is higher than in the absence of deuterium, means for applying a variable electric field across the plate with a direction parallel to the general direction of propogation of light in said path whereby the plane of polarization of the light is variably rotated in dependence upon said field, means for generating an electron beam, means for scanning the electron beam across a major face of said plate, an anode for collecting secondary electrons released from said plate by said electron beam, and a temperature control device for stabilizing the temperature of the plate at a value differing at most 5* from the Curie temperature of the plate, said temperature device comprising a capacitor as a temperature-determining element the capacity of which varies as a function of the temperature, the dielectric of the capacitor comprising a material having a Curie temperature differing from that of the plate by between 1* and 20*.
Claim 2
Dependent Claim
200 words
An optical relay device, comprising a plate of electrically insulating material positioned in an optical path between a polarizer and an analyzer, said material consisting of an acid salt which is ferroelectric below the Curie temperature thereof, said material being enriched with deuterium whereby the Curie temperature thereof is higher than in the absence of deuterium, means for applying a variable electric field across the plate with a direction parallel to the general direction of propogation of light in said path whereby the plane of polarization of the light is variably rotated in dependence upon said field, means for generating an electron beam, means for scanning the electron beam across a major face of said plate, an anode for collecting secondary electrons released from said plate by said electron beam, and a temperature control device for stabilizing the temperature of the plate at a value differing at most 5* from the Curie temperature of the plate, said temperature device comprising a capacitor as a temperature-determining element the capacity of which varies as a function of the temperature, the dielectric of the capacitor comprising a material having a Curie temperature differing from that of the plate by between 1* and 20*.
Claim 3
Dependent Claim
87 words
A device as claimed in claim 1, wherein said anode is a gridlike anode between the major face of said plate and said scanning means, said anode being disposed parallel to and within 1 mm. from said surface, said device further comprising means for applying a potential to said anode, a gridlike electrode disposed parallel to said gridlike anode on the side of said scanning means and means for applying a potential to said gridlike electrode having a voltage higher than the potential applied to said anode.
Claim 4
Dependent Claim
32 words
A device as claimed in claim 1, wherein the dielectric of the capacitor has a Curie temperature which is between 5* and 20* lower than the Curie temperature of the said plate.
Claim 5
Dependent Claim
41 words
A device as claimed in claim 1, wherein in that the dielectric of the capacitor consists of the same acid salt as the said plate but is enriched with a lower percentage of deuterium than the material of the said plate.
Claim 6
Dependent Claim
22 words
A device as claimed in claim 2, wherein said gridlike electrode comprises parallel wires stretched perpendicular to the lines of the scanning.
Claim 7
Dependent Claim
18 words
A device as claimed in claim 5, wherein the gridlike electrode has a wider pitch than said anode.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |