US4069502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of operating pyroelectric camera tubes
Assignee: Teledyne UK Ltd
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Filing: 1976-06-14
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Granted: 1978-01-17
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Expires: 1996-06-14
Abstract
Abstract A method of operating a pyroelectric camera tube having a normally provided electron beam emitting cathode and control grid G 1 controlling the electron beam, and a gas in the interior space of the tube by applying positively-going pulses to the grid G 1 during the period of the normally applied line blanking pulses. A circuit for producing the positively-going pulses is also disclosed which have the effect of increasing the target pedestal potential.
Inventors
- 👤 Peter David Nelson
- 👤 Peter Baldwin Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/33; H04N23/00; H04N23/20; H04N23/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A circuit arrangement including a pyroelectric camera tube having an electron beam emitting cathode, a control grid G 1 controlling the electron beam and a gas in the interior space of the tube for producing a pedestal potential and pulse generator means for producing a positively-going pulse to the grid G1 during each period of line blanking whereby an increased pedestal potential is produced.
Claim 2
Dependent Claim
64 words
A circuit arrangement including a pyroelectric camera tube having an electron beam emitting cathode, a control grid G 1 controlling the electron beam and a gas in the interior space of the tube for producing a pedestal potential and pulse generator means for producing a positively-going pulse to the grid G1 during each period of line blanking whereby an increased pedestal potential is produced.
Claim 3
Dependent Claim
18 words
A circuit arrangement as claimed in claim 1 wherein the gas employed in the tube is inert gas.
Claim 4
Dependent Claim
18 words
A circuit arrangement as claimed in claim 1 wherein the gas employed in the tube is hydrogen gas.
Claim 5
Dependent Claim
17 words
A circuit arrangement as claimed in claim 1 wherein the amplitude of the positively-going pulses is adjustable.
Claim 6
Independent Claim
122 words
The method of operating a pyroelectric camera tube having an electron beam emitting cathode, a target, scanning mechanism causing the electron beam repetitively to scan the target, a control grid controlling the electron beam and a gas in the interior space of the tube, which comprises the steps of: a. periodically applying line blanking pulses to the cathode to ensure that the cathode is positive with respect to the target so that the electron beam does not land on the target during line flyback; and b. applying a positive-going pulse to the grid during each line flyback whereby an increased pedestal potential is produced at the scanning side of said target due to increased electron beam current and consequent increased gas ionization.
Claim 7
Independent Claim
122 words
The method of operating a pyroelectric camera tube having an electron beam emitting cathode, a target, scanning mechanism causing the electron beam repetitively to scan the target, a control grid controlling the electron beam and a gas in the interior space of the tube, which comprises the steps of: a. periodically applying line blanking pulses to the cathode to ensure that the cathode is positive with respect to the target so that the electron beam does not land on the target during line flyback; and b. applying a positive-going pulse to the grid during each line flyback whereby an increased pedestal potential is produced at the scanning side of said target due to increased electron beam current and consequent increased gas ionization.
Claim 8
Dependent Claim
16 words
A method as claimed in claim 5 wherein the amplitude of the positively-going pulses is adjustable.
Claim 9
Dependent Claim
153 words
A circuit arrangement including a pyroelectric camera tube having an envelope, an electron beam emitting cathode, a target, scanning means for causing the electron beam repetitively to scan said target, a control grid controlling the electron beam, and a quantity of ionizable gas in said envelope; means for maintaining the target at near the electron beam emitting cathode potential applied during forward scanning; means for periodically applying a positive line blanking pulse to said cathode to ensure that the cathode is positive with respect to the target so that the electron beam does not land on the target during line flyback; and pulse generating means for applying a positive-going pulse to said grid during each line flyback, which positive-going pulse is of an amplitude greater than the positive pulse applied to the cathode so as to increase the electron beam current during flyback, thereby increasing gas ionization to produce an increased pedestal potential.
Claim 10
Dependent Claim
153 words
A circuit arrangement including a pyroelectric camera tube having an envelope, an electron beam emitting cathode, a target, scanning means for causing the electron beam repetitively to scan said target, a control grid controlling the electron beam, and a quantity of ionizable gas in said envelope; means for maintaining the target at near the electron beam emitting cathode potential applied during forward scanning; means for periodically applying a positive line blanking pulse to said cathode to ensure that the cathode is positive with respect to the target so that the electron beam does not land on the target during line flyback; and pulse generating means for applying a positive-going pulse to said grid during each line flyback, which positive-going pulse is of an amplitude greater than the positive pulse applied to the cathode so as to increase the electron beam current during flyback, thereby increasing gas ionization to produce an increased pedestal potential.
References Cited (Backward Citations)
US3812396A
Cited
US3946232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |