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US 6,720,691 B2Granted
Vibrating device for transmitting information
AssigneeCitizen Electronics Co., Ltd.
InventorsAkira Yoneyama, Toshio Itakura
Life of this patent
Estimating the term…
Abstract
A vibrating assembly comprises a yoke having a center pole and a peripheral flange, an annular permanent magnet secured to the flange, and an annular top plate secured to the permanent magnet. A supporting plate is provided for resiliently supporting the vibrating assembly in the frame. A preventing means is provided for preventing the vibrating assembly from moving in a radial direction of the vibrating assembly.
Claims3
A vibrating device comprising:
- a frame;
- a vibrating assembly comprising a yoke having a center pole and a peripheral flange, an annular permanent magnet secured to the flange, and an annular top plate secured to the permanent magnet;
- supporting means for resiliently supporting the vibrating assembly in the frame;
- a supporting plate secured to a top portion of the frame;
- an annular driving coil secured to the underside of the supporting plate and inserted in a magnetic gap formed between the yoke and the top plate;
- and
- a central shaft downwardly projected from the supporting plate,
- the central shaft being slidably engaged with a central hole formed in the center vole of the yoke, thereby preventing the vibrating assembly from being moved in a radial direction of the vibrating assembly.
5 more elements
Dependencies are inferred from the claim text.