ANTENNA DEVICE, BATTERY PACK WITH ANTENNA, AND COMMUNICATION TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce the size of an antenna coil and a magnetic body core while ensuring a sufficient communication distance to realize miniaturization as a whole.

SOLUTION: A battery pack 10 has a main surface MS10 and an edge surface ES10, and an appearance thereof is substantially in a rectangular parallelepiped shape. An antenna coil 20 is provided to the main surface MS10. The antenna coil 20 is obtained by forming a coil conductor pattern 22 on a flexible substrate 21. A slit-like aperture AP21 is formed on the flexible substrate 21. A magnetic body core 30 is inserted into the aperture AP21. In the antenna coil 20, the center of a coil aperture part is offset from the center CP10 of the main surface MS10 of the battery pack in a direction of an edge end part of the main surface MS10. A first end E1 in a magnetic path direction of the magnetic body core 30 is extended along the edge surface ES10 of the battery pack 10, and a second end E2 of the magnetic body core 30 is opened toward the center CP10 of the main surface of the battery pack 10.

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