Focus detection system employing multiple area light distributio

Details Focus detection system employing multiple area light distributio Focus detection system employing multiple area light distributio

1989-01-09

1990-04-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

049142828

ABSTRACT:
A focus detection system for detecting a focus state of an object lens, includes an optical device for forming first and second light distributions corresponding to first and second images having light fluxes passing through the different parts of a pupila of the object lens. The positional relationship between the two light distributions varies in accordance with the focus state of the object lens. First and second sensors sense the first and second light distributions. A signal processor for processing output signals from the first and second sensors detect the focus state of the object lens in accordance with the positional relationships between the two light distributions. The signal processor processes the signals from the first and second sensors in accordance with a predetermined formula to obtain the positional relationship between the two images to determine a degree of coincidence of the two light distributions. The signal processing means provides an output signal in accordance with the degree of coincidence of the two light distributions.

REFERENCES:
patent: 4178098 (1979-12-01), Asano et al.
patent: 4185191 (1980-01-01), Stauffer
patent: 4247762 (1981-01-01), Wilwerding
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4387975 (1983-06-01), Araki
patent: 4412741 (1983-11-01), Stein
patent: 4467187 (1984-08-01), Tsunekawa et al.
patent: 4602153 (1986-07-01), Suzuki
patent: 4636624 (1987-01-01), Ishida et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1358800