Automatic focusing device

Details Automatic focusing device Automatic focusing device

1989-08-28

1991-10-01

Adams, Russell E.

354286, G03B 1336

Patent

active

050537989

ABSTRACT:
An automatic focusing device for performing focus detection through an objective optical system, and adjusting the focusing position of the objective optical system in accordance with the detection result, wherein the attachment or detachment of an optical element for changing the focal length of the objective optical system is detected, and the speed of the drive source is changed depending on the detection result.

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patent: 4572638 (1986-02-01), Nakai et al.
patent: 4673275 (1987-06-01), Nakai et al.
patent: 4728980 (1988-03-01), Nakamura et al.
patent: 4733258 (1988-03-01), Kojima
patent: 4737812 (1988-04-01), Hasegawa et al.
patent: 4772909 (1988-09-01), Ogasawara

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