Focus detecting photoelectric device and focus detecting system

Details Focus detecting photoelectric device and focus detecting system Focus detecting photoelectric device and focus detecting system

1982-04-06

1985-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, H01J 4014

Patent

active

044968345

ABSTRACT:
A focus detecting photoelectric device includes a plurality of photodiodes each formed by an amorphous silicon layer sandwiched between transparent and non-transparent electrodes. The photodiodes are provided in pairs and are aligned in an array and deposited on a glass plate such that the transparent electrode is directly mounted on the glass plate. The photodiodes in a pair are located closely adjacent to, but in a spaced relation with, each other and are electrically connected in series to each other. An image formed on the photodiodes in a pair effects the generation of photocurrent from the photodiodes such that the photocurrents from both photodiodes are approximately the same when the image is out of focus, and they vary from each other as the image becomes sharp.

REFERENCES:
patent: 4341954 (1982-07-01), Mizushima et al.
patent: 4347436 (1982-08-01), Fukuda et al.
patent: 4415246 (1983-11-01), Karasaki et al.
patent: 4419696 (1983-12-01), Hamano et al.

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