Abstract: The power generation efficiency is to be enhanced by converting vibration energy including various direction components into electric energy without waste. A cantilever structure is adopted, in which a first plate-like bridge portion (120) and a second plate-like bridge portion (130) extend in a shape of a letter U from a fixing-portion (110) fixed to the device housing (200) and a weight body (150) is connected to the end. On the upper surface of the cantilever structure, a common lower layer electrode (E00), a layered piezoelectric element (300) and discrete upper layer electrodes (Ex1 to Ez4) are formed. The upper layer electrodes (Ez1 to Ez4) disposed on a center line (Lx, Ly) of each plate-like bridge portion take out charge generated in the piezoelectric element (300) due to deflection caused by the Z-axis direction vibration of the weight body (150).

Abstract: A cylindrical annular detector is disposed at the periphery of the columnar body fixed at a central part of the upper surface of a supporting substrate. A space between the columnar body and the annular detector is connected by a thin flexible connection member (diaphragm). A washer-shaped insulation substrate is disposed on the upper surface of the supporting substrate, individual fixed electrodes are formed on the upper surface thereof, and they constitute capacitive elements together with a displacement electrode which is composed of the lower surface of the annular detector. Upon exertion of an external force on the annular detector, the flexible connection member deflects to cause displacement, which is detected as change in capacitance value of the capacitive element.

Abstract: A cylindrical annular detector is disposed at the periphery of the columnar body fixed at a central part of the upper surface of a supporting substrate. A space between the columnar body and the annular detector is connected by a thin flexible connection member (diaphrapm). A washer-shaped insulation substrate is disposed on the upper surface of the supporting substrate, individual fixed electrodes are formed on the upper surface thereof, and they constitute capacitive elements together with a displacement electrode which is composed of the lower surface of the annular detector. Upon exertion of an external force on the annular detector, the flexible connection member deflects to cause displacement, which is detected as change in capacitance value of the capacitive element.

Abstract: A storage device (10) has a flash memory (11), a controller (16) and a second ROM (15). In the flash memory (11), a data key is stored, which is a key unique to each storage device (10). In the second ROM (15), a system key is stored which is an encrypting key common to storage devices (10). The controller (16), when writing data, encrypts the data with the data and system keys and writes the encrypted data in the flash memory (11), and when reading data, decrypts the data with the data and system keys to output the decrypted data. The data key may be encrypted with the system key. In this case, when to write data, the controller (16) may decrypt the data key with the system key, and encrypt data with the decrypted key, and when to read data, the controller may decrypt the data key with the system key, and decrypt the encrypted data with the decrypted data key.