US3757161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television camera geometric distortion correction system
Assignee: COMMERCIALS ELECTRONIS Inc
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Filing: 1970-09-03
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Granted: 1973-09-04
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Expires: 1990-09-03
Abstract
Abstract A geometric distortion correction system for a television camera in which a suitable combination of sawtooth and parabolic wave forms at the horizontal and vertical repetition rates are applied to one of the grids of the camera tube. These wave forms may be regarded as functioning to increase or decrease the deflection sensitivity of the camera tube in synchronism with the scanning thereof, so that the application of conventional linear wave forms to the deflection coils of the camera tube will result in a non-linear scan which, in turn, corrects for the geometric distortion of the camera tube. Preferably, the sawtooth and parabolic wave forms are applied to the focus or G3 grid of the camera tube, the amplitudes and polarities of the wave forms being determined by the nature of the geometric distortion to be corrected for.
Inventors
- 👤 D Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:26
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H04N3/2335
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A method for correcting geometric distortion in the camera tube of a television camera comprising the steps of generating sawtooth wave form signals at the horizontal and vertical repetition rates, generating parabolic wave form signals at the horizontal and vertical repetition rates, applying said sawtooth and parabolic wave form signals to at least one of the grids of said camera tube and adjusting the amplitudes and polarities of the applied parabolic and sawtooth wave forms to substantially correct for the geometric distortion of said camera tube.
Claim 2
Independent Claim
86 words
A method for correcting geometric distortion in the camera tube of a television camera comprising the steps of generating sawtooth wave form signals at the horizontal and vertical repetition rates, generating parabolic wave form signals at the horizontal and vertical repetition rates, applying said sawtooth and parabolic wave form signals to at least one of the grids of said camera tube and adjusting the amplitudes and polarities of the applied parabolic and sawtooth wave forms to substantially correct for the geometric distortion of said camera tube.
Claim 3
Dependent Claim
22 words
The method according to claim 1 wherein the step of generating parabolic wave form signals comprises integrating said sawtooth wave form signals.
Claim 4
Dependent Claim
33 words
The method according to claim 1 wherein the step of applying comprises coupling said sawtooth and parabolic wave form signals with opposite polarities to the G3 and G4 grids of said camera tube.
Claim 5
Independent Claim
96 words
The method for correcting geometric distortion in the camera tubes of a color television camera comprising the steps of generating sawtooth wave form signals at the horizontal and vertical repetition rates, generating parabolic wave form signals at the horizontal and vertical repetition rates, applying said sawtooth and parabolic wave form signals to at least one of the grids of each of said camera tubes and adjusting the amplitudes and polarities of the parabolic and sawtooth wave forms applied to each of said camera tubes independently to substantially correct for the geometric distortion of said camera tubes.
Claim 6
Independent Claim
96 words
The method for correcting geometric distortion in the camera tubes of a color television camera comprising the steps of generating sawtooth wave form signals at the horizontal and vertical repetition rates, generating parabolic wave form signals at the horizontal and vertical repetition rates, applying said sawtooth and parabolic wave form signals to at least one of the grids of each of said camera tubes and adjusting the amplitudes and polarities of the parabolic and sawtooth wave forms applied to each of said camera tubes independently to substantially correct for the geometric distortion of said camera tubes.
Claim 7
Dependent Claim
22 words
The method according to claim 4 wherein the step of generating parabolic wave form signals comprises integrating said sawtooth wave form signals.
Claim 8
Dependent Claim
35 words
The method according to claim 4 wherein the step of applying comprises coupling said sawtooth and parabolic wave form signals with opposite polarities to the G3 and G4 grids of each of said camera tubes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |