| 摘要 |
PURPOSE:To prevent a reproducing characteristic from deteriorating due to a leakage flux by making the winding density of a coil maximum near a magnetic gap. CONSTITUTION:A coil 4 is wound so as to pass between an upper magnetic core 2 and a lower magnetic core 3, the upper magnetic core 2 and the lower magnetic core 3 are proximately form a magnetic gap 1 on one side, and the upper magnetic core 2 and the lower magnetic core 3 are connected on the other side. In addition, the winding density of the coil 4 is maximum near the magnetic gap 1 between the upper magnetic core 2 and the lower magnetic core 3. Consequently, the nearer the magnetic gap 1, the more the interlinkage signal magnetic flux quantity of the conductor of the coil 4, and the larger a inductive signal voltage. Thus, the many conductors at the high reproducing efficiency are obtained, and the reproducing characteristic of the coil is improved. |
