Focus detecting device

Details Focus detecting device Focus detecting device

1986-10-30

1988-02-02

Perkey, W. B.

G03B 300

Patent

active

047231424

ABSTRACT:
The disclosed device prevents degradation of distance measurement accuracy due to alignment error in the mounting of a detachable lens barrel on a camera body. The lens barrel houses a focusing objective lens and a first distance measurement position is set along the optical path of the objective lens within the lens barrel. A second distance measuring position is set within the camera body. A light projector is positioned at one of the distance measuring positions and projects a measuring beam, and a photo detector is positioned at the other of the distance measuring positions to receive a reflection beam from the object being measured to produce a signal to be used for focus adjustment.

REFERENCES:
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 4323303 (1982-04-01), Enomoto
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4394077 (1983-07-01), Yoshino et al.
patent: 4618762 (1986-10-01), Hattori et al.

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