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US 6,208,055 B1Granted
Electromagnetic transducer and electronic device including the transducer
AssigneeSeiko Epson Corporation
InventorOsamu Takahashi
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AssigneeSeiko Epson Corporation
InventorOsamu Takahashi
Estimating the term…
The invention provides an electromagnetic transducer which can improve conversion efficiency by reducing the weight of a rotor and thinning a rotor shaft to reduce both size and weight. An electromagnetic transducer includes a rotor comprising a plurality of magnets with N and S poles arrayed alternately in the direction of rotation of the rotor, and a back yoke for supporting the plurality of magnets. The back yoke is formed with reduced volume regions corresponding to the center of each magnet as viewed in plan based on distribution of magnetic force lines generated inside the back yoke between the N and S poles of the adjacent magnets. With such a reduction of the back yoke, the weight of the back yoke and hence the overall weight of the rotor can be reduced while the magnetic force lines flowing into the magnet are prevented from being saturated.
An electromagnetic transducer comprising a rotor and a coil converting kinetic energy generated due to rotation of said rotor to electrical energy in said coil or for converting electrical energy generated in said coil to kinetic energy in the form of rotation of said rotor,
Dependencies are inferred from the claim text.