Flash synchronizing device

Details Flash synchronizing device Flash synchronizing device

1992-04-24

1994-03-01

Gellner, Michael L.

354129, 354435, 354441, 354446, G03B 1503, G03B 708

Patent

active

052912370

ABSTRACT:
A camera has a shutter which may also constitute a diaphragm. In a multi-flash mode the shutter selectively has a maximum aperture at an onset or at the end of the time base. The flash occurs in synchronism with a shutter waveform shaped by this aperture area and a time base element. In a second embodiment, a second diaphragm setting circuit is provided, in diaphragm priority photography, for computing a measurement value of a distance to a subject and a second diaphragm value from the guide number during an emission of flashed light. The diaphragm is set to the computed second diaphragm value, ad an electronic flash is energized with a desired aperture area. The diaphragm is set to an initial value to effect the photography at a time other than during the emission of flashed light. A timing circuit may be provided for setting the diaphragm to the second diaphragm value. The aperture area may be increased or decreased for diaphragm matching with the quantity of flashed light and the distance to the subject during diaphragm priority flash photography.

REFERENCES:
patent: 4415248 (1983-11-01), Suzuki et al.
patent: 4469989 (1984-09-01), Takematsu
patent: 4478502 (1984-10-01), Nakai
patent: 4603954 (1986-08-01), Egawa et al.
patent: 4779115 (1988-10-01), Fujino et al.
patent: 4806963 (1989-02-01), Kobayashi et al.
patent: 4897684 (1990-01-01), Serikawa
patent: 5144359 (1992-09-01), Hayashi et al.

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