Patent
1980-11-03
1982-03-02
Adams, Russell E.
354 23D, 354 60F, 354195, G03B 1503
Patent
active
043176240
ABSTRACT:
A flash camera having a range finder, a blade position sensor for producing an output representative of the position of the displaceable blades of a scanning shutter, a flash firing apparatus that includes a position/distance converter responsive to the output of the range finder for producing a representation of the desired flash-fire position of the blades, and a coincidence detector responsive to the output of the blade position sensor for firing the flash unit when the blades reach the position at which the exposure aperture established by the blades will effect proper flash exposure of the subject. In one embodiment of the invention, the converter is in the form of a digital memory whose addresses represent subject distances and whose contents at a given address represents the fire-flash position for the distance specified by the given address. In a second embodiment of the invention, the fire-flash position is generated from a scaled clock.
REFERENCES:
patent: 3478660 (1969-11-01), Land
patent: 3794422 (1974-02-01), Chitayat
patent: 4047190 (1977-09-01), Johnson et al.
patent: 4053907 (1977-10-01), Iwata et al.
patent: 4188103 (1980-02-01), Biber et al.
patent: 4199244 (1980-04-01), Shenk
Adams Russell E.
Polaroid Corporation
Thornton David R.
LandOfFree
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