Automatic focusing apparatus and method

Details Automatic focusing apparatus and method Automatic focusing apparatus and method

1996-10-11

1998-02-03

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396 91, 396101, 396127, 396133, G03B 1336

Patent

active

057154830

ABSTRACT:
An automatic focusing apparatus moves a focusing lens once over a full movement range from the nearest point or from the infinite point so as to cause a photoelectric detector to output an electrical signal at predetermined stepwise lens positions. A lens position range can be specified based on the output electrical signal. The lens position range contains a lens position allowing the maximum focus evaluation value. A lens position for the maximum evaluation value is searched within the lens position range. A reliable and fast focusing operation can be obtained for finding out the maximum focus evaluation value without the effect of a local extremum in the focus evaluation value.

REFERENCES:
patent: 4510384 (1985-04-01), Grimbleby et al.
patent: 4681419 (1987-07-01), Sakai et al.
patent: 4853788 (1989-08-01), Murashima et al.
patent: 5249058 (1993-09-01), Murata et al.

Affiliated with

Also associated with

Rating

Automatic focusing apparatus and method 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 apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing apparatus and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-672583