Lenovo (singapore) Pte. Ltd.

Kenji Yanai

Fusanobu Nakamura

Mitsuhiro Yamazaki

Yasushi Tsukamoto

A method of driving an actuator using a shape memory alloy is provided. An impact-driven actuator is activated by a pulse voltage generated by an action of a transistor. A keyboard outputs a key event at the timing of an input operation. A stress monitoring unit calculates a stress amount of an impact-driven actuator based on parameters of a key event and a pulse voltage. A stress adjustment unit changes the parameter of the pulse voltage when the stress amount reaches a permissible value. The parameter may be a wave crest value or a pulse width of the pulse voltage. The stress adjustment section is also able to stop the action of the impact-driven actuator in response to a key event corresponding to a break code.

Growing community of inventors

Kanagawa-ken, Japan

Kenji Yanai