Abstract: The Problems To dissipate or remove droplets of sweat fluid discharged from sweat glands of the finger placed on the sensor surface, which is the cause of the residual fingerprint image, from the surface of the fingerprint image sensor. Means for Solving the Problem On the surface of a fingerprint image acquisition sensor consisting of the electrode 2 of the minimum functional element separated with the grid 1, a coating layer on which the groove 30 is etched on the surface of the coating layer 32, running along the center of each grid line for draining the sweat fluid discharged from the sweat glands on the finger placed on the fingerprint image acquisition sensor.

Abstract: The Problems To provide a smartcard that embeds a fingerprint image acquisition sensor, having thickens of 0.76 mm or less compiling with the International Standard organization (ISO). Means for Solving the Problem A smartcard comprising a core substrate which is configured with a film substrate 21 on which a fingerprint image acquisition sensor IC chip 11, an electric circuit pattern and accompanying electrical, and a reinforcing metal or composite plate 1 which is adhered to the back surface of the fingerprint image acquisition sensor IC chip 11; an over sheets 31 and an under sheet 33, which are made of thermoplastic or paper, sandwiching the core substrate 33, where the over sheet 31 and the under sheet 33 are attached with a thermal adhesive sheet, which functions as a mechanical buffer to protect the electrical components from external stress. The adhesive sheet is made of urethane rubber or similar substance.