In-focus detecting device

Details In-focus detecting device In-focus detecting device

1979-07-19

1981-08-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

3581285, 369 45, G01J 120

Patent

active

042861470

ABSTRACT:
A focus lens protecting and in-focus detecting device has light receiving circuit and a comparator for comparing the output of said light receiving elements with a reference potential. A switch network is controlled by the output of the comparator to supply signals to a focus control amplifier from the light receiving circuit.

REFERENCES:
patent: 3988747 (1976-10-01), Lermann et al.
patent: 4160159 (1979-07-01), Kakukawa et al.
patent: 4160904 (1979-07-01), Witwerding
patent: 4183640 (1980-01-01), Abe

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