| 摘要 |
<p>A coil for a magnetic head includes (1) a spiral coil pattern encircling the generation center of a magnetic field and capable of being fed with current (2) and a conductor pattern provided outside the coil pattern, encircling the generation center, and incapable of being fed with current. The conductor occupancy rate R for the conductor pattern satisfies formulae (1) to (3) where S is the distance from the outermost periphery of the coil pattern and P is the pitch, and the conductor pattern does not form a closed loop encircling the coil pattern in the first area (A1) defined by formula (1). Formula 1: 0≤R≤0.3 in a first area (A1) where 0≤S≤1.5P; Formula 2: 0≤R≤0.8 in a second area (A2) where 1.5P∫S≤6.0P; Formula 3: 0.3∫R≤1 in a third area (A3) where 6.0P∫S</p> |
