Polarizing filter control mechanism to reduce reflected light

Details Polarizing filter control mechanism to reduce reflected light Polarizing filter control mechanism to reduce reflected light

1997-11-14

2000-02-22

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359493, 359501, 359601, G02F 101, H01J 4014

Patent

active

060283033

ABSTRACT:
A polarizing filter control mechanism used in a camera that automatically rotates a polarizing filter in order to minimize the effects of reflected light on a photographic image. An image signal is obtained by an imaging element that converts image light of a photographic subject into an electrical signal. A level detection unit outputs a level detection signal that corresponds to the electrical signal. A minimum value detection unit compares the level detection signal with a reference signal. Using this comparison, the minimum value detection unit outputs an error signal based on a difference between the level detection signal and the reference signal. A drive control unit rotates the polarizing filter until the difference between the level detection signal and the reference signal is minimized.

REFERENCES:
patent: 2423321 (1947-07-01), Hurley, Jr.
patent: 3446977 (1969-05-01), Bateson
patent: 4063266 (1977-12-01), Thomas et al.

Affiliated with

Also associated with

Rating

Polarizing filter control mechanism to reduce reflected light does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polarizing filter control mechanism to reduce reflected light, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarizing filter control mechanism to reduce reflected light will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-522367