1980-08-04
1981-09-01
Griffin, Donald A.
354133, 354250, G03B 1502, G03B 1503, G03B 910
Patent
active
042868548
ABSTRACT:
Magnet-actuable flash apparatus includes a light admission member having an aperture therein and a shutter member also having an aperture therein. The shutter member is movable relative to the light admission member for selective alignment of the apertures to permit the passage of light therethrough. A shutter member actuating member is adapted to move the shutter member between a first position in which the two apertures are out of alignment and a second position in which they are in alignment. A normally open switch, closable in response to the influence of a magnetic field, is adapted to be series connected in an electrical circuit with a source of electrical energy and an artificial light producing element. Permanent magnets are carried by the shutter member and the shutter member actuating member. One of such magnets selectively provides a magnetic field in such proximity to the switch in timed relation to the alignment of the apertures in the shutter member and the light admission member that the switch is caused to close and actuate the artificial light producing elememnt during at least a portion of the time when the apertures are in alignment.
REFERENCES:
patent: 1989109 (1935-01-01), Munder
patent: 2443208 (1948-06-01), Thralls
patent: 3507196 (1970-04-01), Ruhle et al.
patent: 3635141 (1972-01-01), Starp et al.
patent: 4023192 (1977-05-01), Simon et al.
patent: 4081806 (1978-03-01), Seckendorf
Griffin Donald A.
Wrist-A-Matic, Ltd.
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