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    X-ray installation for short-time exposures
    5.
    发明授权
    X-ray installation for short-time exposures 失效
    X射线安装用于短时间曝光

    公开(公告)号：US2113696A

    公开(公告)日：1938-04-12

    申请号：US58969632

    申请日：1932-01-29

    Applicant: PHILIPS NV

    Inventor： ALFRED KUNTKE

    IPC: H05G1/24 ,  H05G1/58

    CPC classification number: H05G1/24 ,  H05G1/58

    Abstract: 376,199. R÷ntgen-ray apparatus ; spark-gap apparatus. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. Feb. 9, 1932, No. 3846. Convention date, Feb. 14, 1931. [Classes 39 (i) and 40 (v).] In installations comprising a condenser discharged through an X-ray tube to produce a short exposure, one of the two operations of switching off the charging current of the condenser and causing the discharge through the tube is accompanied by the other, feeding of the tube from the charging circuit after the discharge being thus avoided. The condenser 1, Fig. 1, may be charged through a resistance 11, a transformer 2 and a rectifier 3 and discharged through an inductance 12 and the X- ray tube 7. A switch 10 in its upper position supplies heating current to the cathode of the rectifier 3 to charge the condenser and in its lower position breaks this supply to stop the charging and supplies the cathode of the tube 7 to produce the discharge. In modifications, an electromagnetic or thermal relay controls the discharge circuit. The exciting coil of the relay may be in parallel to or in series with the cathode of the rectifier 3, or the switch 10 in its lower position may energize the relay. In Fig. 4, closure of a switch 20 heats the cathode of the rectifier 3 and energizes a coil 15. When the switch 20 is opened, a pin 15 in the coil 15 drops and reduces the gap between ball or other electrodes 18, 19 to allow the condenser 1 to discharge through the tube 7. A time-lag relay 21 opens the heating circuit of the tube 7 after the discharge. The switch 20 may control only the transformer 16, the relay 21 being omitted and the cathode of the tube 7 continuously supplied with current. The extinction of the glow in a discharge tube 23 across a resistance 22 in the charging circuit may be used to indicate that the condenser 1 is sufficiently charged. Lighting of the tube 23 due to the alternating current flowing in the circuit on account of the capacity of the rectifier 3 may be prevented by a condenser 24 across the tube 23.

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