US3564243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit for use with x-ray generating device for cine-radiography
Assignee: Hitachi Ltd
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Filing: 1968-03-04
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Granted: 1971-02-16
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Expires: 1988-03-04
Abstract
Abstract Cineradiography wherein an AC sinusoidal input is converted by an inverter using controlled rectifiers into rectangular pulses in synchronism with shutter opening signals provided by a cinecamera, and the rectangular pulses in turn are boosted to high voltage pulses which are applied to the anode of an X-ray tube so as to produce pulselike X-rays of optional time-width required for photographing only during the period when the shutter is opened, thereby minimizing the dosage to which a patient is exposed. Thus, the device described herein is advantageous over the conventional devices in which pulse-like Xrays are generated under the control of the grid of an X-ray tube, in that the former can be constructed at lower cost, and that high-speed cinephotography can be carried out since the number of frames per second can be selected irrespective of the frequency of the power source.
Inventors
- 👤 Yoshito Takao
- 👤 Haruyuki Kusagaya
- 👤 Shigenobu Yanaka
- 👤 Kouichi Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:37
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155; H05; H05G; H05G1/00; H05G1/08; H05G1/10; H05G1/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
A power supply circuit for use with an X-ray generating device for cine-radiography, comprising rectifier-smoother circuit means for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, DC chopper circuit means composed of controlled rectifiers and connected with the output of said rectifier-smoother circuit means, means for supplying a control signal to said DC chopper circuit means in accordance with shutter opening signals provided by a cine-camera being independent of the voltage produced by the AC power source so as to produce rectangular pulses in synchronism with said shutter opening signals at the output side of said DC chopper circuit means, and means for boosting the output pulses of said DC chopper circuit means to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of said high voltage pulses every time the shutter is opened.
Claim 2
Dependent Claim
157 words
A power supply circuit for use with an X-ray generating device for cine-radiography, comprising rectifier-smoother circuit means for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, DC chopper circuit means composed of controlled rectifiers and connected with the output of said rectifier-smoother circuit means, means for supplying a control signal to said DC chopper circuit means in accordance with shutter opening signals provided by a cine-camera being independent of the voltage produced by the AC power source so as to produce rectangular pulses in synchronism with said shutter opening signals at the output side of said DC chopper circuit means, and means for boosting the output pulses of said DC chopper circuit means to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of said high voltage pulses every time the shutter is opened.
Claim 3
Dependent Claim
42 words
The power supply circuit of claim 1, wherein said means for supplying a control signal includes first means for receiving said shutter open signal from said cine-camera and for generating first and second signals each time said cine-camera delivers shutter opening signals.
Claim 4
Dependent Claim
40 words
The power supply circuit of claim 2 further including second and third means for receiving said first and second signals respectively for generating pulses alternately reversed in polarity in synchronism with the delivery of shutter opening signals by said cine-camera.
Claim 5
Dependent Claim
24 words
The power supply circuit of claim 3, wherein said second and third means each comprise a differentiating rectifier and monostable multivibrator connected in series.
Claim 6
Dependent Claim
20 words
The power supply circuit of claim 4, wherein said first means comprises a differentiating rectifier and flip-flop connected in series.
Claim 7
Dependent Claim
20 words
The power supply circuit of claim 2, wherein said first means comprises a differentiating rectifier and flip-flop connected in series.
Claim 8
Dependent Claim
177 words
A power supply circuit for use with an X-ray generating circuit for cine-radiography comprising a pair of rectifier-smoother circuits for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, a pair of DC chopper circuits composed of controlled rectifiers and connected with the outputs of said rectifier-smoother circuits, means for supplying a control signal to each of said chopper circuits in accordance with shutter opening signals provided by a cine-camera independently of the voltage produced by the AC power source so as to produce rectangular pulses in synchronism with said shutter opening signals alternately at the output sides of said DC chopper circuits, means for combining the output pulses of said chopper circuits into axially symmetrical rectangular pulses which are alternately reverse in polarity, and means for boosting and rectifying said axially symmetrically rectangular pulses to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of high voltage pulses every time the shutter is opened.
Claim 9
Dependent Claim
177 words
A power supply circuit for use with an X-ray generating circuit for cine-radiography comprising a pair of rectifier-smoother circuits for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, a pair of DC chopper circuits composed of controlled rectifiers and connected with the outputs of said rectifier-smoother circuits, means for supplying a control signal to each of said chopper circuits in accordance with shutter opening signals provided by a cine-camera independently of the voltage produced by the AC power source so as to produce rectangular pulses in synchronism with said shutter opening signals alternately at the output sides of said DC chopper circuits, means for combining the output pulses of said chopper circuits into axially symmetrical rectangular pulses which are alternately reverse in polarity, and means for boosting and rectifying said axially symmetrically rectangular pulses to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of high voltage pulses every time the shutter is opened.
Claim 10
Dependent Claim
167 words
A power supply circuit for use with an X-ray generating device for cine-radiography, comprising rectifier-smoother circuit means for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, DC chopper circuit means including at least bridge-connected four controlled rectifiers connected with the output of said rectifier-Smoother circuit means, means for supplying a control signal to said DC chopper circuit means in accordance with shutter opening signals provided by a cine-camera independently of the voltage produced by the AC power source so as to produce axially symmetrical rectangular pulses which are alternately reversed in polarity in synchronism with said shutter opening signals at the output side of said DC chopper circuit means, and means for boosting and rectifying the output pulses of said DC chopper circuit means to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of said high voltages every time the shutter is opened.
Claim 11
Dependent Claim
167 words
A power supply circuit for use with an X-ray generating device for cine-radiography, comprising rectifier-smoother circuit means for converting an AC sinusoidal input from a commercial AC power source into a DC voltage, DC chopper circuit means including at least bridge-connected four controlled rectifiers connected with the output of said rectifier-Smoother circuit means, means for supplying a control signal to said DC chopper circuit means in accordance with shutter opening signals provided by a cine-camera independently of the voltage produced by the AC power source so as to produce axially symmetrical rectangular pulses which are alternately reversed in polarity in synchronism with said shutter opening signals at the output side of said DC chopper circuit means, and means for boosting and rectifying the output pulses of said DC chopper circuit means to high voltage pulses and applying the latter to the anode of an X-ray tube, wherein pulselike X-rays of optional time-width are generated with the application of said high voltages every time the shutter is opened.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |