MEMORY DATA CONTROLLER

Japanese Patent JP3629929

B2

PROBLEM TO BE SOLVED: To accurately destroy the data of an RAM inside a device even in the case that the device is intentionally destroyed by a third person.
SOLUTION: This device is provided with a terminal having an RAM 4 in which storage data are backed-up by the power source of a battery 25, door 2 provided in a case of the terminal and a mechanical switch SW linked with the opening and closing of the door. Further, this device is provided with an optical sensor SR provided inside the case for inputting an optical signal from the outside of the case and outputting it as an electric signal in the case of making the data of the RAM in an unavailable state at the time of detecting the opening of the door, a clock generating part 21 for outputting a clock at the time of detecting the output of one of the mechanical switch and the optical sensor, a counter 22 for counting the clock and as transistor 27 for short- circuiting between the battery backup power source terminals of the RAM based on the count output of the counter.

JP4102639	Communication terminals, programs and recording media
JP2005293507	CONTENT PROVIDING SYSTEM
JP2000113066	METHOD AND SYSTEM FOR MANAGING DISTRIBUTION OF DIGITAL CONTENTS

Yasuhisa Oshima
Yasuyuki Hirose

JP33970597A

March 16, 2005

December 10, 1997

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Saxa Co., Ltd.

G06F12/14; G06F21/75; G06F21/86; (IPC1-7): G06F12/14

JP60157648A
JP8161232A
JP61120957U

Masaki Yamakawa
Hiroro Kurokawa
Shigeki Yamakawa
Masayuki Konno
Osamu Nishiyama

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