Focus position detector
专利汇可以提供Focus position detector专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a stable focus detector which prevents malfunction by making the measuring field of a photoelectric transducer disposed on the intended focal plane of an optical system smaller than the measuring fields corresponding to the other two photoelectric transducers.
CONSTITUTION: The photodetecting part 6" of a photoelectric transducer 6 having 3 pieces of photodetecting part is formed narrow as compared to the other 6', 6". In a window function generating circuit WIN, the size of the central photodetecting part 6" is made substantially narrow. When a stair step signal generator GE is started by the output of an AND gate. A
4 , it rises from the first of the photodetecting part and when it is started by the output of an AND gate A
3 , it rises at the timing of the time when it comes to the start address of the narrow visual field and therefore this results in that narrow visual field is created only for the part 6" and if this signal is outputted through a limiter LIM, only the central part 6" has a substantially narrow visual field. With such constitution, the same effect of preventing malfunction is provided and the stable focus position detector is obtained.
COPYRIGHT: (C)1982,JPO&Japio，下面是Focus position detector专利的具体信息内容。
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