US3878328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for electronically compensating for mechanical stresses in an optic relay
Assignee: US Philips Corp
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Filing: 1973-05-16
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Granted: 1975-04-15
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Expires: 1993-05-16
Abstract
Abstract A method and a device for electronically compensating for stresses in an optic relay. In order to compensate for the mechanical stresses which occur especially during the cooling of the target in the relay, a sawtooth correction signal of line frequency is superimposed upon the video signal, the slope of the signal varying with the frame frequency. Field of application: Projection of television pictures, FIG. 4.
Inventors
- 👤 Gerard J M Marie
- 👤 Jacques Donjon
- 👤 Auguste Raymond Lepape
- 👤 Bernard Monod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:00
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/006; G; G01; G01L; G01L1/00; G01L1/18; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0327; G02F1/0333; H10; H10D; H10D99/00; H10N; H10N39/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A method of electrically compensating for mechanical stresses occuring in a Pockels effect crystal used in conjunction with a television type electronic scanner in an optic relay supplied with video information signals comprising the steps of generating a voltage corresponding to the formula: v k (x - xo) (y - yo), where x and y the Cartesian scanning coordinates, xo and yo the coordinates of the center of symmetry of the stresses, k a factor which is proportional to the stresses to be compensated for, and superimposing the generated voltage on the video information signal.
Claim 2
Independent Claim
95 words
A method of electrically compensating for mechanical stresses occuring in a Pockels effect crystal used in conjunction with a television type electronic scanner in an optic relay supplied with video information signals comprising the steps of generating a voltage corresponding to the formula: v k (x - xo) (y - yo), where x and y the Cartesian scanning coordinates, xo and yo the coordinates of the center of symmetry of the stresses, k a factor which is proportional to the stresses to be compensated for, and superimposing the generated voltage on the video information signal.
Claim 3
Dependent Claim
63 words
A method as claimed in claim 1 for use in conjunction with an optic relay where The video information signal is applied in the form of an electric field across the crystal, wherein the step of superimposing the generated voltage on the video signal comprises the step of applying the generated voltage in the form of an additional electrical field across the crystal.
Claim 4
Dependent Claim
41 words
A method as claimed in claim 1 wherein the step of generating the voltage comprises the step of separately modulating two symmetrical sawtooth signals of line frequency with two sawtooth signals of frame frequency, and adding the results of the modulation.
Claim 5
Dependent Claim
56 words
A method as claimed in claim 1 for use in conjunction with an optic relay where the video signal modulates the electronic scanner, wherein the step of superimposing the generated voltage on the video signal comprises the step of applying the generated voltage in the form of an additional modulating signal to the electronic scanner signal.
Claim 6
Independent Claim
81 words
A method for electronically compensating for stresses occurring in a Pockels effect crystal used in conjunction with a polar-type electronic scanner of an optic relay supplied with video information signals, comprising the steps of generating a voltage corresponding to the formula: v k''r2 sin (2 theta ) where: r and theta are the polar scanning coordinates and k'' is a factor which is proportional to the stresses to be compensated for, and superimposing the generated voltage on the video information signal.
Claim 7
Independent Claim
81 words
A method for electronically compensating for stresses occurring in a Pockels effect crystal used in conjunction with a polar-type electronic scanner of an optic relay supplied with video information signals, comprising the steps of generating a voltage corresponding to the formula: v k''r2 sin (2 theta ) where: r and theta are the polar scanning coordinates and k'' is a factor which is proportional to the stresses to be compensated for, and superimposing the generated voltage on the video information signal.
Claim 8
Dependent Claim
63 words
A method as claimed in claim 5 for use in conjunction with an optic relay where the video information signal is applied in the form of an electrical field across the crystal, wherein the step of superimposing the generated voltage on the video signal comprises the step of applying the generated voltage in the form of an additional electric field across the crystal.
Claim 9
Dependent Claim
51 words
A method as claimed in claim 5 for use in conjunction with an optic relay where the video signal modulates the electronic scanner, wherein the step of superimposing the generated voltage comprises the step of applying the generated voltage in the form of an additional modulating signal to the electronic scanner.
References Cited (Backward Citations)
US3520589A
Cited
US3637931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |