| 摘要 |
PCT No. PCT/JP96/02477 Sec. 371 Date Dec. 24, 1996 Sec. 102(e) Date Dec. 24, 1996 PCT Filed Aug. 30, 1996An improved photoelectric displacement detector is disclosed which includes (a) a light receiving part (1) having a pair of solar battery panels (1b, 1c) vertically arranged adjacent to each other, (b) a vertical motion mechanism (2) which is driven by a motor (3) to vertically linear-shift the light receiving part (1), (c) a vertical light quantity difference detection part (4) for detecting, based on signals from the solar battery panels (1b, 1c), a difference between the quantity of light received in the solar battery panel (1b) and the quantity of light received in the solar battery panel (1c) and (d) a CPU (5) for controlling the operation of the motor (3) according to the received light quantity difference detected by the vertical light quantity difference detection part (4). Reference laser light is sent onto the light receiving part (1) and the light receiving part (1) is vertically shifted in order that the aforesaid received light quantity difference is cancelled to zero. The amount of motion of the light receiving part (1) at the time when the aforesaid received light quantity difference is cancelled to zero, is determined by a rotary encoder (6).
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