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Electromagnetically-driven-shutter

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Electromagnetically driven shutter

Details

Inventors: Yoshida, Syozo; Sugiura, Yoji;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Hix; L. T.
Assistant Examiner: Perkey; William B.
Attorney, Agent or Firm: Toren, McGeady & Stanger

An electromagnetically driven shutter of which the leading and trailing curtains are driven by respective electromagnetic drive sources to make a forward and backward movement. The electromagnetic drive sources each have a magnetic winding constructed in a unified form of two coils arranged to be supplied with respective currents flowing in direction opposite to each other so that the forward movement of each of the leading and trailing curtains is followed, after a controlled time interval, by the backward movement thereof.

DETAILED DESCRIPTION An object of the present invention is to eliminate the above-described drawbacks and to provide an electromagnetically operated shutter of which the electromagnetic drive source has a magnetic winding constructed in a unified form of two coils arranged to be supplied with respective currents flowing in the opposite direction to each other.
Another object of the invention is to make two exposures in each cycle of shutter operation.
A further object of the invention is to select one of the two coils for employment in allowing a shutter drive current to flow therethrough, and the other for employment in allowing a shutter brake current to flow in the opposite direction to that in which the drive current flows therethrough.

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