| 摘要 |
PURPOSE:To improve the rising performance of tube voltage and to provide safety X-ray exposure by controlling the first and second switching elements in an inverter controller so that they are simultaneously closed just before the start of relative switching operation. CONSTITUTION:DC voltage controlled in a specified value is applied to an inverter 13. An X-ray exposure controller 22 generates an X-ray exposure signal (b) by input timing of graticule signal (a). An inverter controller 17 generates an exposure preparation signal based on the rising of the initial exposure signal b1. Transistors Q2, Q3 are simultaneously closed until the next exposure signal b2 rises. When the X-ray exposure signal b2 is inputted, the controller 17 relative ly switches the transistors Q2, Q3 to generate high voltage in the secondary winding 14b of a transformer 14, and an X-ray tube 16 generates X-ray. The rising performance of tube voltage KV generated by X-ray exposure signals b2, B3... is substantially improved by previously passing the current with a sufficient value through the primary winding 14a.
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