Electrically controlled shutter

Details Electrically controlled shutter Electrically controlled shutter

1975-06-30

1977-05-03

Hix, L. T.

354 51, 354 60R, G03B 708

Patent

active

040218228

ABSTRACT:
An improvement is made in a camera wherein the exposure is controlled by an electronic circuit comprising a photoelectric element so situated as to receive a light reflected from the surface of photographic film in the camera.
Conventional shortcomings of the above-mentioned camera that a time delay from operation of the electronic switching circuit to an actual completion of closing of the already opened shutter has been liable to cause an over-exposure and that an exposure period shorter than the delay has been impracticable can be eliminated by employing another photoelectric element which continuously receives a light from the object and influences a current to flow into a timer circuit.
Moreover, by means of a change-over switch, the circuit is switched so as to be controlled substantially by the second photoelectric element in case the photographic object is so bright as to necessitate a high speed exposure faster than the time delay.

REFERENCES:
patent: 3678825 (1972-07-01), Nobusawa
patent: 3864699 (1975-02-01), Tsunekawa et al.

Affiliated with

Also associated with

Rating

Electrically controlled shutter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrically controlled shutter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrically controlled shutter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-349237