Automatic focusing device used for a camera

Details Automatic focusing device used for a camera Automatic focusing device used for a camera

1990-10-01

1992-06-09

Perkey, W. B.

G03B 1336

Patent

active

051211548

ABSTRACT:
An automatic focusing device employs an active range finder to establish an initial range to an object. A blur is calculated based on the initial range. If the blur is less than a predetermined value, the active range finder is bypassed in favor of a passive range finder. A focusing drive is responsive to the output of the passive range finder to drive the focus toward zero blur. If the initial range provides a blur calculation exceeding the predetermined value, the focusing drive responds to the active range finder until the calculated blur is reduced to a second predetermined value, at which time the active range finder is bypassed in favor of the passive range finder. Thereafter, the focusing drive responds to the passive range finder.

REFERENCES:
patent: 4255029 (1981-03-01), Freudenschuss
patent: 4518242 (1985-05-01), Toyama
patent: 4592638 (1986-06-01), Kaneda et al.
patent: 4632532 (1986-12-01), Matsumura et al.
patent: 4771307 (1988-09-01), Kuno et al.
patent: 4835561 (1989-05-01), Matsui
patent: 4947202 (1990-08-01), Kitajima et al.
patent: 4992817 (1991-02-01), Aoyama et al.

Affiliated with

Also associated with

Rating

Automatic focusing device used for a camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic focusing device used for a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing device used for a camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1807998