1985-12-09
1987-05-12
Griffin, Donald A.
354249, 354251, G03B 960, G03B 936, G03B 906
Patent
active
046644938
ABSTRACT:
To eliminate manual cocking operation and to facilitate in making the size of a camera compact, a spring made of a shape memory alloy plastically deformable at normal temperature but restoring a powerful resiliency when heated is associated with the shutter driving mechanism in arranging the shutter driving mechanism so that the latter assumes its cocked state in its normal state and that, upon depression of the shutter button, an electric current is supplied to the above-mentioned spring to heat same and to cause an opening and closing movement of the shutter blades by virtue of the resulting resiliency gained by the spring, and that upon completion of the opening and closing movement of the shutter blades, the conduction of electric current to the spring is cut off to deprive this spring of its resiliency whereby automatically causing the shutter driving mechanism to resume its cocked state.
REFERENCES:
patent: 3496853 (1970-02-01), Rittman
patent: 3810222 (1974-05-01), Nakagawa
patent: 3825940 (1974-07-01), Hayami
patent: 4104665 (1978-08-01), Tadashi et al.
patent: 4142789 (1979-03-01), Koyama et al.
patent: 4199243 (1980-04-01), Nakano
patent: 4220409 (1980-09-01), Inoue
Copal Company Limited
Griffin Donald A.
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