Optical apparatus for correcting focus detection caused by envir

Details Optical apparatus for correcting focus detection caused by envir Optical apparatus for correcting focus detection caused by envir

1997-10-29

2000-11-07

Gray, David M.

Photography

Having variable focal length of camera objective

Having focus operation

396 82, 396 97, G03B 1700, G03B 1300

Patent

active

061448052

ABSTRACT:
An optical apparatus includes first and second lenses, first and second detection devices, and a control device. The first lens varies magnification, and the second lens, positioned on a focal-plane side of the first lens, corrects variation of an image forming position. The first detection device detects at least one of temperature and humidity. The second detection device detects positions of the first and second lenses. The control device controls movement of the second lens during movement of the first lens by using outputs from both the first and second detection devices.

REFERENCES:
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4982216 (1991-01-01), Kudo et al.
patent: 5124738 (1992-06-01), Yamashita
patent: 5412448 (1995-05-01), Kunishige

Affiliated with

Also associated with

Rating

Optical apparatus for correcting focus detection caused by envir does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical apparatus for correcting focus detection caused by envir, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical apparatus for correcting focus detection caused by envir will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1650154