| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio information storage medium capable of securing a communication distance in an external form hard to detach from an object and production thereof. SOLUTION: The external form of a resin case 21 of a radio data carrier 2 is composed of a base part 2a formed large, an upper surface part 2b formed smaller than the base part 2a and a large slope 2c for connecting the base part 2a and the outer peripheral part of the upper surface part 2b. Besides, a transmitting/receiving antenna 23 is formed along with the external form of the resin case 21. Namely, this antenna is formed angular while having the large slope on the side along with the external form of the resin case 21 and formed annular so as to surround an electronic component 24 provided in the center. |
