VIBRATION ELECTRICITY GENERATION DEVICE
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United States of America Patent
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Jan 10, 2017
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Jul 22, 2014
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Abstract
The vibration electricity generation device comprises a fixed unit and a movable unit supported on the fixed unit via a coil spring. The movable unit is configured to vibrate against resilient force of the coil spring thereby generating induced electromotive force. The coil spring is coupled to the movable unit in a position apart from the center position of the movable unit with respect to the vibration direction toward the opposite side of the position where the coil spring is coupled to the fixed unit. Even in the case the vibration electricity generation device is reduced in size with respect to the vibration direction, the length of the coil spring can be extended, thereby enhancing selection freedom of vibration frequency.
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