| 摘要 |
PROBLEM TO BE SOLVED: To individually measure generated electric charges by providing a sensor including a means for generating a transient internal thermal change on the matrix of sensitive elements. SOLUTION: A fingerprint sensor is an integrated circuit having a rectangular form sized enough for executing the read of fingerprint. This integrated circuit includes the matrix of sensitive elements formed from active pyroelectric layers arranged between the matrixes of upside and downside electrodes. An integrated circuit 20 includes a resistor 29 for heating near the sensitive elements of sensor in the area of these sensitive elements. Then, the sensitive element of sensor is transiently heated by the resistor for heating. On the pyroelectric surface of sensor, a finger having a fingerprint or not to move is held. The sensor provides an analog signal expressing the image of fingerprint to an output. The respective analog images generated by the sensor are displayed on the screen of video frequency terminal for enabling the immediate evaluation of picture quality of images provided by the sensor constantly. |
