Focus detecting device

Details Focus detecting device Focus detecting device

1994-05-09

1998-04-28

Adams, Russell E.

Photography

With exposure objective focusing means, focusing aid, or...

Temperature compensating

396114, G03B 300, G03B 1336

Patent

active

057458057

ABSTRACT:
A focus detecting device includes a photographic lens, a condenser lens disposed adjacent to a preset imaging plane of the photographic lens, an aperture stop having a pair of apertures arranged with sufficient space for ensuring focus accuracy, a reimaging lens having a pair of lens elements arranged to correspond to individual apertures, and a photoelectric converter. Two light beams passing through different areas of the photographic lens are received by the photoelectric converter and the phase difference between the two light beams is detected from the intensity distribution of light on the light-receiving surface of the photoelectric converter so that a focusing state of the photographic lens can be recognized. Further, the focus detecting device satisfies the condition:

REFERENCES:
patent: 4650309 (1987-03-01), Ishida et al.
patent: 4662735 (1987-05-01), Karasaki et al.
patent: 4772912 (1988-09-01), Ishida et al.
patent: 4828383 (1989-05-01), Kunishige et al.
patent: 4841326 (1989-06-01), Koyama et al.
patent: 4931521 (1990-06-01), Matsuda
patent: 4959677 (1990-09-01), Suda et al.
patent: 4975727 (1990-12-01), Ohtaka et al.
patent: 5233382 (1993-08-01), Taniguchi et al.
patent: 5251069 (1993-10-01), Iizuka
patent: 5399850 (1995-03-01), Nagatani

Affiliated with

Also associated with

Rating

Focus detecting device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus detecting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1543463