Abstract:
PURPOSE: A device for transmitting a power of a contactless card reader is provided to generate an electromagnetic wave for supplying a power and compensate a resonance frequency between a contactless card reader and each passive card according as a sensor circuit which is operated over a frequency operation range of the contactless card reader which senses existence and the number of passive cards. CONSTITUTION: A sensor circuit(41) senses an existence and the number of passive cards(30) using infrared rays or supersonic waves. If a signal for sensing the number of cards is inputted, a resonance frequency compensating circuit(42) outputs a resonance frequency compensating signal for compensating the passive card(30) and a contactless card reader(20a). If a card sensing signal and the resonance frequency compensating signal are inputted, a power control circuit(43) outputs a predetermined frequency generating signal for controlling a compensation of a resonance frequency between the contactless card reader(20a) and the passive card(30). If a switch of an interior is varied, a power generating unit(44) generates an electromagnetic wave for supplying a power. A matching circuit(45) combines the electromagnetic wave generated from the power generating unit(44) with an antenna(46) and outputs the electromagnetic wave to an exterior.
Abstract:
PURPOSE: A device and method for controlling a power source of a computer system using a living body recognition is provided to reinforce authentication with respect to a user and enhance a security level of a computer system by supplying a system power source after authenticating a user using a fingerprint recognition. CONSTITUTION: A fingerprint recognition sensor(21) recognizes a fingerprint when a user touches one's finger thereon. A central processing unit(25) performs a fingerprint registration, a fingerprint edition, and a fingerprint deletion in accordance with a user's request on condition that a computer system is turned-on. The central processing unit(25) compares fingerprint information being inputted through the fingerprint recognition sensor(21) with a pre-registered fingerprint and performs a user authenticating process on condition that the computer system is turned-off. A ROM(24) includes the program performed by the central processing unit(25). A RAM(22) is controlled by the central processing unit(25) and stores data for performing the program. An EEPROM(23) stores the registered user fingerprint information. An input/output element(26) performs data input/output to the computer system.