| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sealed letter enabling sending of a noncontact type data transmitter-receiver by integrating a sealed letter material with the transmitter- receiver and thereby to simplify the operation of sending the transmitter- receiver. SOLUTION: An antenna 7 is provided on one surface to be the inner side of the sealed letter, out of one of top paper 2 of the sealed letter and under paper 3 of an envelope, when the top paper and the under paper are put on each other, and the noncontact type data transmitter-receiver 6 constituted by mounting an IC chip 8 on the antenna 7 is provided. |
