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US 2003/0164647 A1Published application
Vibrating device for axially vibrating a movable member
AssigneeCitizen Electronics Co., Ltd.
InventorsTakashi Kobayashi, Masaki Tohyama, Kenshi Aihara, Akira Nikaido, Kazumi Miyamoto, Naoki Miura
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Abstract
A cup-shaped yoke is axially movably provided in a cylindrical frame, and a cylindrical permanent magnet is securely provided in the yoke. A coil bobbin is cantilevered in the frame and inserted in a space between the yoke and the permanent magnet, and a driving coil is mounted on the coil bobbin. The yoke is held by a pair of coil springs for resiliently holding the yoke in the frame.
Claims7
A vibrating device comprising:
- an axially elongated frame;
- a hollow yoke having an axially elongated shape and an opening at an end thereof, and axially movably provided in the frame;
- at least one permanent magnet securely provided in the yoke;
- a coil bobbin cantilevered in the frame and having an end portion inserted in the yoke from the opening and in a space between the yoke and the permanent magnet;
- a driving coil mounted on the coil bobbin;
- and
- at least one spring provided for resiliently holding the yoke in the frame.
4 more elements
Dependencies are inferred from the claim text.