Automatic control circuit system for cameras provided with a foc

Details Automatic control circuit system for cameras provided with a foc Automatic control circuit system for cameras provided with a foc

1978-07-10

1980-02-05

Gellner, Michael L.

354 60R, G03B 708, G03B 1738

Patent

active

041870182

ABSTRACT:
An automatic control circuit system for cameras provided with a focal-plane shutter having front and rear screens, in which a battery voltage is supplied into the automatic control circuit system via a semiconductor switching element when a first release switch of a two-step release switch of a two-step release switch is closed. When a second release switch is closed, the rear screen starts running. A potential for electrically turning on the semiconductor switching element when the first release switch is closed is applied to a control electrode of the switching element. The automatic control circuit system is provided with an electric signal holding circuit, which is triggered with an electric signal generated when the second release switch is closed, to hold at the output terminal of the control electrode an output signal whereby an electric signal for electrically turning on the semiconductor switching element is held in the control electrode and retain the supply of the battery voltage into the automatic control circuit system. The electric signal holding circuit is triggered in response to a rear screen control signal whereby the starting of running of the rear screen of the focal-plane shutter is instructed, to reverse the holding of the output signal so that the semiconductor switching element is electrically turned off with the supply of the battery voltage into the automatic control circuit system stopped.

REFERENCES:
patent: 3810227 (1974-05-01), Taguchi et al.
patent: 4037236 (1977-07-01), Numata et al.
patent: 4145130 (1979-03-01), Shimizu et al.

Affiliated with

Also associated with

Rating

Automatic control circuit system for cameras provided with a foc 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 control circuit system for cameras provided with a foc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic control circuit system for cameras provided with a foc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2178380