Vibration energy generator
AssigneeBrother Kogyo Kabushiki Kaisha
InventorRyuta Iijima
Life of this patent
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Abstract
A vibration energy generator includes a case, a coil, a permanent magnet, and a shield magnet. The case is elongated in one direction and is made from a nonmagnetic material. The coil surrounds around an outer surface of the case. The permanent magnet reciprocates inside the case along the one direction. The permanent magnet is magnetized with a polarity oriented in the one direction. The shield magnet is disposed in one end portion of the permanent magnet in the one direction. Each of a surface of the one end portion and a surface of the shield magnet facing the surface of the one end portion has the same magnetic polarity. The length of the shield magnet in the one direction is less than the length of the permanent magnet in the one direction.
Claims12
A vibration energy generator, comprising:
- a case elongated in one direction, the case comprising a nonmagnetic material;
- a coil surrounding an outer surface of the case;
- a permanent magnet, magnetized with a polarity oriented in the one direction, configured to reciprocate inside the case along the one direction;
- and
- a shield magnet disposed adjacent to one end portion of the permanent magnet in the one direction,
- wherein a surface of the one end portion and a surface of the shield magnet facing the surface of the one end portion have the same magnetic polarities, and
- wherein the length of the shield magnet in the one direction is less than the length of the permanent magnet in the one direction.
Dependencies are inferred from the claim text.