US3714427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for taking section radiographs
Assignee: US Philips Corp
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Filing: 1970-07-20
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Granted: 1973-01-30
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Expires: 1990-07-20
Abstract
Abstract An apparatus for taking section radiographs with the x-ray tube being movable in two mutually perpendicular directions simultaneously by two separate electric motors. The speeds of the motors are independently variable so that the tube''s movement can describe any desired path including an ellipse, while the x-ray source is also adjustable.
Inventors
- 👤 J Lemmrich
- 👤 F Reiniger
- 👤 Hacht R Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:24
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/54; A61B6/541; A61B6/44; A61B6/4429; A61B6/4464; H; H02; H02P; H02P27/00; H02P27/02; H02P27/026; A61B6/548
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
127 words
In an apparatus including an X-ray source and using an X-ray film cassette for taking section radiographs, the improvement in combination therewith comprising drive means including an electric motor for moving the X-ray source along a predetermined path which includes a central position, and for simultaneously moving the film cassette along said path in the opposite direction, circuit means for controlling said motor including means for sensing the position of the X-ray source along the path relative to said central position and for providing sequential time signals, a plurality of motor-current thyristor pairs connected in parallel opposition and having gate terminals receiving said time signals from said means for sensing, whereby the X-ray source is returned to its central position after each cyclical movement along said path.
Claim 2
Dependent Claim
127 words
In an apparatus including an X-ray source and using an X-ray film cassette for taking section radiographs, the improvement in combination therewith comprising drive means including an electric motor for moving the X-ray source along a predetermined path which includes a central position, and for simultaneously moving the film cassette along said path in the opposite direction, circuit means for controlling said motor including means for sensing the position of the X-ray source along the path relative to said central position and for providing sequential time signals, a plurality of motor-current thyristor pairs connected in parallel opposition and having gate terminals receiving said time signals from said means for sensing, whereby the X-ray source is returned to its central position after each cyclical movement along said path.
Claim 3
Dependent Claim
127 words
In an apparatus including an X-ray source and using an X-ray film cassette for taking section radiographs, the improvement in combination therewith comprising drive means including an electric motor for moving the X-ray source along a predetermined path which includes a central position, and for simultaneously moving the film cassette along said path in the opposite direction, circuit means for controlling said motor including means for sensing the position of the X-ray source along the path relative to said central position and for providing sequential time signals, a plurality of motor-current thyristor pairs connected in parallel opposition and having gate terminals receiving said time signals from said means for sensing, whereby the X-ray source is returned to its central position after each cyclical movement along said path.
Claim 4
Dependent Claim
127 words
In an apparatus including an X-ray source and using an X-ray film cassette for taking section radiographs, the improvement in combination therewith comprising drive means including an electric motor for moving the X-ray source along a predetermined path which includes a central position, and for simultaneously moving the film cassette along said path in the opposite direction, circuit means for controlling said motor including means for sensing the position of the X-ray source along the path relative to said central position and for providing sequential time signals, a plurality of motor-current thyristor pairs connected in parallel opposition and having gate terminals receiving said time signals from said means for sensing, whereby the X-ray source is returned to its central position after each cyclical movement along said path.
Claim 5
Dependent Claim
34 words
An apparatus as claimed in claim 15 characterized in that said drive means comprises means for sensing load fluctuations and for adjusting the speed of said drive means corresponding to said change in load.
Claim 6
Dependent Claim
39 words
An apparatus for taking section radiographs as claimed in claim 2 characterized in that said drive means comprises an induction motor, and said circuit means varies the speed of the motor by the variation of the effective supply voltage.
Claim 7
Dependent Claim
70 words
An apparatus as claimed in claim 3 characterized in that said circuit means provide a voltage proportional to the speed with a polarity depending upon the direction of rotation, which voltage is compared with a determined voltage, the difference in value acting upon a phase angle control, which shifts the instants of ignition of thyristors included in the conductors of the motors so that the difference in value is minimized.
Claim 8
Dependent Claim
24 words
An apparatus as claimed iN claim 4 characterized in that at the zero passage of the value difference the field of rotation is reversed.
Claim 9
Dependent Claim
47 words
An apparatus as claimed in claim 4 characterized in that the determined voltages for the drives in both directions are varied in accordance with a program which provides a displacement of the X-ray source along one path within the rectangle determined by the maximum paths of displacement.
Claim 10
Dependent Claim
54 words
An apparatus as claimed in claim 6 characterized in that patterns representing the desired speed variations of the swinging paths are provided, which are scanned in accordance with the desired-speed variation for displacing potentiometer tappings from which the determined voltages for the control-circuits of the drives for the longitudinal and transverse directions are derived.
Claim 11
Dependent Claim
33 words
An apparatus as claimed in claim 6 characterized in that the determined voltages are produced by a function generator, the desired curves being formed by a substantially straight line, sinusoidal and parabolic arcs.
Claim 12
Dependent Claim
40 words
An apparatus as claimed in claim 4 characterized in that the determined voltages for the drives in the two directions vary sinusoidally in time, a phase shift of one quarter period occurring between the zero passages of the determined voltages.
Claim 13
Dependent Claim
47 words
An apparatus as claimed in claim 1 wherein said X-ray tube is displaced, prior to the exposure, along said path out of the central position, which path is tangential to a predetermined swinging path at a main peak point, from where it terminates in the swinging path.
Claim 14
Dependent Claim
33 words
An apparatus as claimed in claim 10 characterized in that the speed of the X-ray source at the instant of reaching said main peak point corresponds to the speed along the swinging path.
Claim 15
Dependent Claim
24 words
An apparatus as claimed in claim 10 characterized in that the X-ray source is switched on when it has reached said main peak point.
References Cited (Backward Citations)
DE1138617B
Cited
DE1118397B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |