Patent Number: 7,714,535

Title: Power storage device

Abstract: In the field of portable electronic devices in the future, portable electronic devices will be desired, which are smaller and more lightweight and can be used for a long time period by one-time charging, as apparent from provision of one-segment partial reception service "1-seg" of terrestrial digital broadcasting that covers the mobile objects such as a cellular phone. Therefore, the need for a power storage device is increased, which is small and lightweight and capable of being charged without receiving power from commercial power. The power storage device includes an antenna for receiving an electromagnetic wave, a capacitor for storing power, and a circuit for controlling store and supply of the power. When the antenna, the capacitor, and the control circuit are integrally formed and thinned, a structural body formed of ceramics or the like is partially used. A circuit for storing power of an electromagnetic wave received at the antenna in a capacitor and a control circuit for arbitrarily discharging the stored power are provided, whereby lifetime of the power storage device can be extended.

Inventors: Yamazaki; Shunpei (Setagaya, JP), Arai; Yasuyuki (Atsugi, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

International Classification: H01M 10/46 (20060101)

Expiration Date: 5/11/12018