Automatic focus adjustment of a camera

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

250204, 250209, 354 25, 354 31, G03B 310

Patent

active

039537293

ABSTRACT:
This invention relates to a system for automatic focus adjustment of an optical system particularly adapted for use in a photographic camera which utilizes non-linear resistance versus illumination response characteristics which are prominent in photoconductive cells such as cadmium sulfide and cadmium selenide cells. In one embodiment, a pair of photoconductive cells, one of which has a photoconductive surface having elongated side portions which contact the electrodes along the length of the elongated side portions and another cell which has an elongated photoconductive surface and shortened end portions and which contact the electrodes only at the shortened end portions, are arranged so that portions of an image-forming light beam entering through an objective of the camera are directed to the photoconductive surfaces on which similar real images of an object are formed. The objective includes at least one lens member movable for focusing associated with an automatic focus control mechanism operative in response to variation of an electrical output signal of the photoconductive cell assembly produced when the degree of sharpness of the image on each of the photoconductive surfaces is varied as the focussing member is moved for focussing purposes with respect to the photoconductive cell assembly.

REFERENCES:
patent: 3469925 (1969-09-01), Urbach et al.
patent: 3562785 (1971-02-01), Craig
patent: 3758209 (1973-09-01), Harvey
patent: 3860935 (1975-01-01), Stauffer

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Automatic focus adjustment of 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 focus adjustment of a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focus adjustment of a camera will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2004670

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.