Automatic focusing device and automatic exposure control device

Details Automatic focusing device and automatic exposure control device Automatic focusing device and automatic exposure control device

1988-02-25

1989-06-06

Adams, Russell E.

354286, G03B 300

Patent

active

048375942

ABSTRACT:
An automatic focusing device which compises a defocus amount detecting unit for detecting a defocus amount attributable to a first optical system of an interchangeable lens assembly and a second optical system of an AF convertor, a converting circuit for converting the defocus amount into a data corresponding to a focusing amount of the second optical system which varies in non-linear relationship to the defocus amount, and an optical drive unit for moving the second optical system on the basis of a data representative of the focusing amount supplied from the converting circuit.

REFERENCES:
patent: 4003068 (1977-01-01), Hashimoto et al.
patent: 4589753 (1986-05-01), Kawai
patent: 4627699 (1986-12-01), Takagi
patent: 4728980 (1988-03-01), Nakamura et al.

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