| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna that suppresses heat radiation from a conductive plate, and a contactless data receiver/transmitter and a disk recording medium therewith.SOLUTION: An antenna 10 includes an annular conductive plate 11 usable in the contactless data receiver/transmitter mountable on a disk recording medium 20 having a first region 22 and a surrounding second region 23 comprising a conductive part 24 and an insulating part 25. The conductive plate 11 includes a feed portion 13 connected to an IC chip, a slot 14 provided on an inner circumferential side from the feed portion 13 along an outer shape of the conductive plate 11 and passing through the conductive plate 11 in a thickness direction, and a plurality of voids 15 surrounding the slot 14, provided at intervals along the outer shape of the conductive plate 11 and passing through the conductive plate 11 in the thickness direction. When the contactless data receiver/transmitter is mounted on the disk recording medium 20, the conductive plate 11 is at least partly opposite to the conductive part 24. |
