| 摘要 |
PURPOSE:To improve the assembling operability by joining a condenser block and an electronic circuit block with have been assembled and completed separately and by fixing them to each other. CONSTITUTION:A photodetector so designed as to receive a signal light emitted from a projector by means of a photoelectric element 21 and to output an electric signal is constituted of a condenser block 1 and an electronic circuit block 2. A circular light-transmitting window 11 is provided in the central part of the condenser block 1, and an observation hole 15 is provided in the front upper part thereof, while a plug insertion hole 16 is provided on the lower side. A convex reflector 13 is formed inside the light-transmitting window 11. The electronic circuit block 2 is constructed of the photoelectric element 21, electronic components 23, an operation indicator lamp 24 and a wiring connector 25 which are mounted on a wiring substrate 22.
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