| 摘要 |
In a flat magnetic head coil constituted by spiral coil patterns made of a conductive material film and two terminals connected to the coil patterns, the coil patterns have a substantially rectangular sectional shape. A minimum pitch P [mum] of the coil pattern, a width W [mum] of the sectional shape at the minimum pitch P, and a height H [mum] satisfy 15 [mum]<=P<=70 [mum] and 1.8-0.012P<=H/W<=7.5-0.06P. When an impedance Z0 between the two terminals of the coil while a core made of a magnetic material is not attached is equivalently constituted by an inductance L0, an RF resistance Rp0 parallel to the inductance L0, and a DC resistance Rs which is series-connected to the inductance L0 and is independent of a frequency, the inductance L0 [muH] at 10 MHz satisfies L0<=0.85 [muH].
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