Automatic electronic flash device producing preliminary flash li

Details Automatic electronic flash device producing preliminary flash li Automatic electronic flash device producing preliminary flash li

1980-12-29

1982-09-14

Hix, L. T.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315241P, G03B 1505, H05B 4126

Patent

active

043492606

ABSTRACT:
An automatic electronic flash device capable of producing both a preliminary flash light used for automatic determination of a diaphragm aperture of a camera and a primary flash light used for actual photographing has signal contacts which are less in number than the signals to be transmitted from the camera to the flash device for the control of the production of the preliminary and primary flash lights. Thus, a common signal contact is used for transmission of both a preliminary flash control signal and a primary flash stop signal. The flash device is provided with a control circuit which properly delivers the two signals to a preliminary flash control circuit section and a primary flash termination circuit section of the flash device in dependence upon whether or not a synchronizing signal for initiating the production of the primary flash light appears at the synchronizing contacts. The preliminary flash control signal controls both initiation and termination of the production of the preliminary flash light in an embodiment and only termination of the production of the preliminary flash light in another embodiment, with which another signal contact is used for receiving a preliminary flash command signal for initiating the production of the preliminary flash light from the camera.

REFERENCES:
patent: 3547017 (1970-12-01), Harvey
patent: 4189219 (1980-02-01), Hasegawa et al.

Affiliated with

Also associated with

Rating

Automatic electronic flash device producing preliminary flash li 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 electronic flash device producing preliminary flash li, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic electronic flash device producing preliminary flash li will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2152797