Honda Giken Kogyo Kabushiki Kaisha

Nidec Copal Corporation

Shigeru Yamagishi

Nobuaki Watanabe

Minoru Hiroyasu

Tohru Eguro

Hideo Yamashita

Koji Takahashi

Shigenari Shino

Tamotsu Ohguro

A blade driving device for use in cameras of the present invention includes a base plate having an exposure aperture, an ND filter blade that is supported rotatably around a supporting shaft on the base plate and is moved to a position withdrawn from the exposure aperture and a position facing the exposure aperture, and an electromagnetic actuator that drives the ND filter blade. This electromagnetic actuator includes a frame member joined to the base plate, a rotor which has a drive pin for exerting a driving force and rotates within a predetermined angle range with one end of which being supported to the frame member and the other end of which being supported to the base plate, and an exciting coil wound around the frame member and the base plate. Therefore, the structure of the electromagnetic actuator for driving a shutter blade, a diaphragm blade, an ND filter blade or the like can be simplified and reduced in cost, and this makes it possible to reduce the size and thickness of the device.

Blade driving device for use in cameras

A camera blade driving device for use in a camera has a base plate having an exposure aperture; a blade supported pivotably on a supporting shaft on the base plate and capable of blocking part or all of light passing through the aperture while facing the aperture; and an electromagnetic actuator for driving the blade. The electromagnetic actuator has a frame member joined to the base plate; a rotor one end of which is supported by the frame member and an opposite end of which is supported by the base plate, the rotor having a driving pin by which a driving force is exerted onto the blade and rotating within a predetermined angular range; a magnetizing coil wound onto the frame member and the base plate; and a yoke provided outside the coil substantially coaxially with the rotor. With this structure, a fastening component like a screw is not needed, the number of components can be lessened, the structure can be simplified, costs can be reduced, and the driving device can be reduced in thickness, unlike a conventional device.

Camera blade driving device

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Growing community of inventors

Tokyo, Japan

Shigeru Yamagishi