Shutter speed control means for focal plane shutter

Details Shutter speed control means for focal plane shutter Shutter speed control means for focal plane shutter

1974-05-14

1976-10-05

Hix, L. T.

354237, 354242, 354256, 354266, G03B 964

Patent

active

039848485

ABSTRACT:
The start of the leading curtain or the trailing curtain of a focal plane shutter is controlled to obtain an accurate exposure time. A delay means is provided in the mechanism for releasing the leading curtain or in the mechanism for releasing the trailing curtain. The difference between the delay time of the start of the leading curtain and the delay time of the start of the trailing curtain is controlled to be equal to the constant time during which the leading curtain runs overlapping with the trailing curtain. In one embodiment, an inertia member is provided in the vicinity of the curtain release member to delay the movement of the curtain release member. In another embodiment, an electric delay circuit is provided to delay the start of the trailing curtain. In both embodiments, the time of delay of the start of the curtain can be controlled.

REFERENCES:
patent: 2928326 (1960-03-01), Loose et al.
patent: 3630136 (1971-12-01), Kitai
patent: 3683767 (1972-08-01), Sahara
patent: 3766839 (1973-10-01), Furusawa et al.
patent: 3852778 (1974-12-01), Iura
patent: 3852785 (1974-12-01), Ogihara et al.
patent: 3872488 (1975-03-01), Oshima

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