Focal point coincidence sensing device

Details Focal point coincidence sensing device Focal point coincidence sensing device

Filed on

1979-04-30

Date issued

1982-05-25

Examiner

Adams, Russell E.

Other Related Categories

354 31, G03B 708

Type

Patent

Status

active

Patent number

043313990

Description

ABSTRACT:
A focal point detecting device comprises a light-receiving device having a plurality of light-receiving elements which receive incident light coming from two different light paths. In the first step, the light-receiving device receives the incident light coming from the second light path while the first light path is blocked and the values of the photoelectric outputs A.sub.1, . . . A.sub.n of each of the light-receiving elements are compared one with another and the compared values stored in a memory circuit. In the second step, the light-receiving device receives either the incident light coming from the first light path while the second light path is blocked or the incident light coming from both the first and second light path and the values of the photoelectric outputs B.sub.1, . . . B.sub.n of each of the light-receiving element are compared on with another and the compared values are compared with the contents stored in the memory circuit and a focal point coincident signal is fed out in response to a favorable comparison.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4180309 (1979-12-01), Miyata et al.

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