US4044249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage supply including bilateral attenuator
Assignee: Biometrics Instrument Corp
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Filing: 1975-12-15
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Granted: 1977-08-23
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Expires: 1995-12-15
Abstract
Abstract The specification discloses a voltage supply system particularly adapted for use as an automatic brightness control for an image intensifier tube. The system includes a power oscillator for applying a constant A.C. voltage to a first multiplier which generates at least one constant D.C. voltage for application to the screen of the image intensifier tube. A regulator circuit includes a low power oscillator which generates a control A.C. signal and which further includes circuitry responsive to the screen current of the image intensifier tube for varying the amplitude of the control A.C. signal. The frequency of the control A.C. signal is substantially greater than the frequency of the constant A.C. voltage. A bilateral attenuator receives the constant A.C. voltage and is operable in response to the control A.C. signal for varying the amplitude of the constant A.C. voltage. A second multiplier is connected to the output of the attenuator for generating a variable D.C. voltage for application to the microchannel plate of the image intensifier tube.
Inventors
- 👤 Charles E. Moore, Jr.
- 👤 Sammy L. Crane
- 👤 Donald L. Lipke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:55
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/275; H02M5/293; H01; H01J; H01J29/00; H01J29/98; H02M3/00; H02M3/22; H02M3/24; H02M3/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A voltage supply system for an image intensifier tube comprising: an oscillator for generating an A.C. voltage, first multiplier means responsive to said A.C. voltage for generating at least one constant D.C. voltage for application to the image intensifier tube, a regulator circuit responsive to the screen current of the image intensifier tube and to said A.C. voltage for generating an amplitude varied A.C. voltage, and second multiplier means responsive to said amplitude varied A.C. voltage output from said regulator circuit for generating a D.C. voltage for application to the microchannel plate of the image intensifier tube.
Claim 2
Dependent Claim
97 words
A voltage supply system for an image intensifier tube comprising: an oscillator for generating an A.C. voltage, first multiplier means responsive to said A.C. voltage for generating at least one constant D.C. voltage for application to the image intensifier tube, a regulator circuit responsive to the screen current of the image intensifier tube and to said A.C. voltage for generating an amplitude varied A.C. voltage, and second multiplier means responsive to said amplitude varied A.C. voltage output from said regulator circuit for generating a D.C. voltage for application to the microchannel plate of the image intensifier tube.
Claim 3
Dependent Claim
23 words
The voltage supply system of claim 1 wherein said regulator circuit includes a bilateral attenuator for varying the amplitude of the A.C. voltage.
Claim 4
Dependent Claim
20 words
The voltage supply system of claim 2 wherein said bilateral attenuator comprises: a diode bridge having a transistor connected thereacross.
Claim 5
Dependent Claim
56 words
The voltage supply system of claim 2 wherein said regulator circuit includes an oscillator for generating an A.C. control signal, means for varying the amplitude of said A.C. control signal in response to the screen current and to said D.C. voltage, and means for controlling the operation of said bilateral attenuator with said A.C. control signal.
Claim 6
Dependent Claim
24 words
The voltage supply system of claim 4 wherein the frequency of said A.C. control signal is greater than the frequency of said A.C. voltage.
Claim 7
Dependent Claim
153 words
An automatic brightness control system for an image intensifier tube having a screen and a microchannel plate comprising: a power oscillator for generating an A.C. voltage, a first multiplier responsive to said A.C. voltage for generating at least one constant D.C. voltage for application to the screen of the image intensifier tube, a regulator circuit including a low power oscillator for generating a control A.C. signal and further including circuitry responsive to the screen current of the image intensifier tube for varying the amplitude of said control A.C. signal, a bilateral attenuator for receiving said A.C. voltage and operable in response to said control A.C. signal for generating an amplitude varied A.C. voltage, and a second multiplier connected to the output of said bilateral attenuator for receiving said amplitude varied A.C. voltage and in response thereto for generating a variable D.C. voltage for application to the microchannel plate of the image intensifier tube.
Claim 8
Dependent Claim
153 words
An automatic brightness control system for an image intensifier tube having a screen and a microchannel plate comprising: a power oscillator for generating an A.C. voltage, a first multiplier responsive to said A.C. voltage for generating at least one constant D.C. voltage for application to the screen of the image intensifier tube, a regulator circuit including a low power oscillator for generating a control A.C. signal and further including circuitry responsive to the screen current of the image intensifier tube for varying the amplitude of said control A.C. signal, a bilateral attenuator for receiving said A.C. voltage and operable in response to said control A.C. signal for generating an amplitude varied A.C. voltage, and a second multiplier connected to the output of said bilateral attenuator for receiving said amplitude varied A.C. voltage and in response thereto for generating a variable D.C. voltage for application to the microchannel plate of the image intensifier tube.
Claim 9
Dependent Claim
26 words
The automatic brightness control system of claim 6 wherein the frequency of the control A.C. signal is substantially greater than the frequency of said A.C. voltage.
Claim 10
Dependent Claim
31 words
The automatic brightness control system of claim 6 wherein said regulator circuit is also responsive to the output of said second multiplier for varying the amplitude of said control A.C. signal.
Claim 11
Dependent Claim
29 words
The automatic brightness control system of claim 6 wherein said bilateral attenuator comprises: a first pair of series connected diodes connected across a second pair of series connected diodes.
Claim 12
Dependent Claim
23 words
The automatic brightness control system of claim 9 wherein said A.C. voltage is applied to the junction between said first pair of diodes.
Claim 13
Dependent Claim
25 words
The automatic brightness control system of claim 9 wherein the output of said attenuator is connected to the junction between said second pair of diodes.
Claim 14
Dependent Claim
39 words
The automatic brightness control system of claim 9 and further comprising: a transistor connected at its collector and emitter across said first and second pair of diodes, the base of said transistor connected to receive said control A.C. signal.
Claim 15
Dependent Claim
24 words
The automatic brightness control system of claim 12 and further comprising: a resistor connected in series with said transistor across said pairs of diodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |