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    • 1. 发明专利
    • HIGH-SPEED X-RAY SHUTTER
    • JPH10300893A
    • 1998-11-13
    • JP11764297
    • 1997-04-21
    • KOUENERUGII KASOKUKI KENKYU KIKAWASAKI HEAVY IND LTD
    • HYODO KAZUYUKIANDO MASAMINAKAGAWA SHIGETOMO
    • G21K1/04A61B6/00G21K5/02
    • PROBLEM TO BE SOLVED: To reduce X-ray exposure more by providing a shutter mechanism for passing X-ray only for a fixed time every fixed period and a detecting mechanism capable of confirming the passing state of X-ray, and emitting a trigger signal synchronous with the passing. SOLUTION: An Z-ray irradiation device 8 rotates an X-ray transmitting hole 20 at a prescribed speed to pass Xray for a fixed time every fixed period. A rotating drum 21 having the X-ray transmitting hole 20 vertical to the rotating axis is journalled to a bearing 23 fixed onto a base 22, and rotated by a drum rotating motor 24. An emitted light 7 straightly advances and reaches a spectroscope when the X-ray transmitting hole 20 is coincident with the optical path of the emitted light 7 including X-ray, and it is shielded to prevent a patient from being exposed to X-ray when the X-ray transmitting hole 20 is shifted from the optical path. The X-ray passing timing is detected by three detectors differed in principle of an optical sensor (a light emitting element 29, a light receiving element 30), a proximity sensor 31, and an encoder 32, and processed by a signal processing device. Thus, even if any one of these detectors fails, the device is never laid in inoperable state.