| 摘要 |
PURPOSE:To increase the speed of response by forming a P-type region in order to surround a phototransistor and electrically connecting the region to an emitter region in the phototransistor. CONSTITUTION:A P-type region 8 is shaped in order to surround a base region 3, and the region 8 is connected electrically to an emitter electrode 6. When a phototransistor 10 is introduced to a saturated state by the input of an optical signal, a section between the base 3 and a collector 2 is changed into the forward direction, and carriers excessively shaped by the optical signal 9 pass through a P-N-P transistor using the base region 3 as an emitter, the collector region 2 as a base and the P-type region 8 as a collector, and flow through the electrode 6. Accordingly, working speed can be increased by simple constitution. |
