US3683191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulator system
Assignee: Varian Medical Systems Inc
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Filing: 1970-05-18
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Granted: 1972-08-08
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Expires: 1990-05-18
Abstract
Abstract A floating deck modulator circuit for the modulation of an electron tube and particularly adapted for x-ray tubes employing a control grid. The modulator circuit utilizes a pair of high voltage electron tubes serially connected through a biasing network for providing a bias voltage between the grid and cathode of the tube. A single pulsing, or keying, circuit is directly connected to one of the electron tubes and coupled to the other electron tube by a transformer which insulates the circuit from high voltage. The modulator circuitry is adapted to be enclosed within an x-ray tube housing, and coupling of the modulation circuitry through the housing to a remote control unit is provided by a modulated light beam which accomplishes coupling across a high difference of potential.
Inventors
- 👤 Robert K Maclachlan
- 👤 Derek Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:46
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/02; H03; H03K; H03K5/00; H03K5/01; H03K5/02; H05G1/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A modulation system comprising: a source of x-radiation; means for modulating said source of x-radiation, said modulator means producing a first voltage and a second voltage, said first voltage being terminated in response to the leading edge of a signal pulse applied to said modulator means, said second voltage being initiated in response to the leading edge of said signal pulse and being terminated in response to a termination of said signal pulse; logic means coupled to said modulator means for providing signals indicating the concurrence and nonconcurrence of said second voltage with said signal pulse; means responsive to said signals of said logic means for terminating x-radiation from said source of x-radiation; a movable housing providing for the emission of x-radiation in a preselected direction, said housing enclosing said source of xradiation and said modulator means; and first transmission means having a first terminus and a second terminus and extending through a wall of said housing to transmit signals for said logic means, said first terminus being electrically insulated from said second terminus.
Claim 2
Dependent Claim
174 words
A modulation system comprising: a source of x-radiation; means for modulating said source of x-radiation, said modulator means producing a first voltage and a second voltage, said first voltage being terminated in response to the leading edge of a signal pulse applied to said modulator means, said second voltage being initiated in response to the leading edge of said signal pulse and being terminated in response to a termination of said signal pulse; logic means coupled to said modulator means for providing signals indicating the concurrence and nonconcurrence of said second voltage with said signal pulse; means responsive to said signals of said logic means for terminating x-radiation from said source of x-radiation; a movable housing providing for the emission of x-radiation in a preselected direction, said housing enclosing said source of xradiation and said modulator means; and first transmission means having a first terminus and a second terminus and extending through a wall of said housing to transmit signals for said logic means, said first terminus being electrically insulated from said second terminus.
Claim 3
Dependent Claim
46 words
The modulation system of claim 1 further comprising second transmission means having a first terminus and a second terminus and extending through a wall of said housing to transmit said signal pulse to said modulator means, said first terminus and said second terminus being electrically insulated.
Claim 4
Dependent Claim
55 words
The modulation system of claim 2 wherein said first and said second transmission means comprises: means for converting said signal pulse into an optical signal; means for guiding said optical signal through said wall of said housing; and means for reconverting said optical signal back into a signal having the characteristics of said signal pulse.
Claim 5
Dependent Claim
47 words
The modulation system of claim 3 wherein said logic means is coupled to said modulator means by fault detection means responsive to a flow of current from said source to said modulator means, said fault detection means providing a signal when said current attains a predetermined value.
References Cited (Backward Citations)
US2840718A
Cited
US3567940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |