Patent
1974-10-02
1976-06-15
Greiner, Robert P.
354 32, 354 34, G03B 1503
Patent
active
039640779
ABSTRACT:
Mechanism for synchronizing the illumination produced by flash units of two different types, with the operation of a camera shutter, especially a shutter of the type having one blade mechanism for opening the shutter to start the exposure, and a separate blade mechanism for closing the shutter to terminate the exposure. The synchronizing mechanism has electronic circuitry which produces, at a single bi-polar contact, a first voltage variation at the beginning of the shutter opening movement and a second voltage variation at a later time, not later than the beginning of the shutter closing movement. A first form of adapter, used with a combustible flash bulb of the current-operated type, is plugged into the synchronous contact of the camera, and this adapter fires the flash bulb in response to the first voltage variation, far enough in advance of the termination of the exposure to allow time for the combustible flash bulb to achieve sufficient illumination intensity while the exposure is still in progress. A second form of adapter is plugged into the synchronous contact of the camera when an electronic flash unit is used, and responds to the second voltage variation, to cause firing of the electronic flash unit at a time when the shutter is open.
REFERENCES:
patent: 3424071 (1969-01-01), Schwahn
patent: 3559548 (1971-02-01), Ackerman
patent: 3559549 (1971-02-01), Ackerman
patent: 3667357 (1972-06-01), Matsuda
patent: 3712197 (1973-01-01), Wagner
patent: 3750550 (1973-08-01), Kasemeier
patent: 3756132 (1973-09-01), Ogawa
Greiner Robert P.
Rollei-Werke Franke & Heidecke
LandOfFree
Flash synchronizing mechanism for cameras does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flash synchronizing mechanism for cameras, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flash synchronizing mechanism for cameras will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1698476