Focus detection device

Television – Special applications – Simulator

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

348297, G03B 1336, H04N 314

Patent

active

055025382

ABSTRACT:
This focus detection device uses electric charge accumulation type photoelectric conversion devices. The time period for the next episode of electric charge accumulation by these photoelectric conversion devices is calculated based upon the time period for the current episode of electric charge accumulation, so as to keep the maximum level of an electrical signal for focus detection output from the photoelectric conversion devices less than or equal to a previously determined target level. The accumulation of electric charge by the photoelectric conversion devices is then performed according to this calculated electric charge accumulation time period, and the resultant electrical signal for focus detection is output. A monitor photoelectric conversion device is provided for monitoring the electric charge accumulation state of the photoelectric conversion devices, and this monitor photoelectric conversion device outputs a monitor electrical signal correlated to the average amount of electric charge accumulation of the photoelectric conversion devices. If the electrical signal for focus detection output by the photoelectric conversion devices comes to exceed the maximum input level for its A/D conversion device, then the standard level for the monitor electrical signal is reduced, so as to ensure quick termination of the next episode of electric charge accumulation by the photoelectric conversion devices.

REFERENCES:
patent: 4479062 (1984-10-01), Kawasaki et al.
patent: 4623927 (1986-11-01), Hoshino et al.
patent: 4701626 (1987-10-01), Ishizaki et al.

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

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

Rate now

     

Profile ID: LFUS-PAI-O-920057

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