| 摘要 |
PURPOSE:To reduce pincushion distortion and simultaneously enhance resolution by executing photo-electric conversion on a square and flat type radiant picture conversion panel and by extracting an electrical signal sequentially in time from the photo-electric conversion panel after multiplying such photo-electron. CONSTITUTION:When a radiant ray 9, for example, the X-ray is incident, it is converted to the light by the first phosphor screen 151. This light beam reaches a photoelctric screen 153 which thereby emits the photo electrons 154 in accordance with intensity of such light beam. A photo-electric conversion panel 107 is arranged within the distance d, for example, 10mm. or less, from a radiant ray picture conversion panel 106. The photo-electric conversion panel 107 is provided with a second phosphor screen 161 and a photo-conductive screen 168. The light 167, of which intenisy has been multiplied by a photomultiplying means, sent from the second phosphor screen 161 is transmitted to the photo-conductive screen 168, accummulating charged picture elements on the surface thereof. A pair of mesh electrodes 108, 109 are provided on the side of electron gun 110 of the photo-electric conversion panel 107 and a voltage which is higher than that to be applied to a first mesh electrode 109 is applied to a second mesh electrode 108. The readout electron beam 111 which is deflected by a deflection yoke 113 and is accelerated by the first mesh electrode 109 is furthr deflected almost at a right angle toward the second mesh electrode 108 and enters almost at a right angle to the photo-conductive screen 168. Thereby, an electrical signal corresponding to charged picture elements on the surface thereof can be extracted from the output terminal 115 of the photo-conductive screen 168. |
