Nidec Copal Corporation

Norihumi Ikeda

Nobuaki Watanabe

Daisuke Yaginuma

Tomokazu Kihara

The camera shutter unit of the present invention comprises a diaphragm blade arranged to be capable of moving between a stopping-down position wherein an aperture is stopped down, and an evacuating position wherein the aperture is opened. A shutter blade is arranged to be capable of moving between an opening position, wherein the aperture is opened, and a closing position, wherein the aperture is closed. A dive-control mechanism is provided for drive-controlling the shutter blade and the diaphragm blade. The drive-control mechanism has a single electromagnetic drive source, a spring for restricting movement of the shutter blade toward the closing position when the diaphragm blade is positioned in the stopping-down position, and for releasing its restriction by a predetermined or more drive force generated by the electromagnetic drive source, and a control means for controlling the electromagnetic drive source. The control means, upon stopping down, controls to move the shutter blade to the closing position in advance and next move in reverse the shutter blade by a predetermined amount, thereby positioning the diaphragm blade in the stopping-down position. Accordingly, the unit can be of a small size and low in cost, and the bouncing of diaphragm blade can be prevented.

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Tokyo, Japan

Norihumi Ikeda