Coil for magnetic head, magnetic head, and magneto-optical recorder

摘要

The conductor pattern of a magnetic head coil includes a spiral coil pattern to which a current can be supplied to flow around the magnetic field generation center, and a conductor pattern which is formed outside the coil pattern and cannot receive a current so as to flow around the magnetic field generation center. Letting S be the distance from the outer edge of the outermost periphery of the coil pattern, and P be the pitch, a conductor occupation ratio R of a conductor pattern formed outside the coil pattern simultaneously satisfies inequalities 1 to 3, and the conductor pattern does not form any closed loop surrounding the coil pattern in a first region A1 given by inequality 1: Inequality 1: 0 ≤ R ≤ 0.3 in the first region A1 where 0 ≤ S ≤ 1.5P Inequality 2: 0 ≤ R ≤ 0.8 in a second region A2 where 1.5P < S ≤ 6.0P Inequality 3: 0.3 < R ≤ 1 in a third region A3 where 6.0P < S