Focus detecting device

Details Focus detecting device Focus detecting device

Filed on

1990-03-21

Date issued

1991-01-01

Examiner

Adams, Russell E.

Other Related Categories

354406, G03B 1336

Type

Patent

Status

active

Patent number

049822195

Description

ABSTRACT:
A focus detecting device is provided with an objective lens, a re-imaging device for separating the optical image of an object obtained through the objective lens into a plurality of identical secondary optical images and re-imaging the same, a first photodetector device for detecting two of the secondary optical images and outputting relative position information thereof, a second photodetector device for detecting at least one of the secondary optical images and outputting photodetection information (e.g., infrared) of the at least one optical image, and a correcting device for correcting the relative position information on the basis of the photodetection information.

REFERENCES:
patent: 4746948 (1988-05-01), Matsui
patent: 4835561 (1989-05-01), Matsui
patent: 4859842 (1989-08-01), Suda et al.

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