Patent ID: 6584045
Filing Date: 2003-06-24
Classification: G11B

Abstract:
A magnetic head coil having a conductor pattern made of a conductive material film, wherein the conductor pattern includes a spiral coil pattern to which a current can be supplied to flow around a magnetic field generation center, and a conductor pattern which is formed outside the coil pattern and cannot receive at least a current so as to flow around the magnetic field generation center, where S is a distance from an outer edge of an outermost periphery of the coil pattern, and P is a pitch (or minimum value when the pitch is not constant) of the coil pattern, a conductor occupation ratio (ratio of a total area of all conductor patterns formed in a given region to a total area of the region) R of a conductor pattern formed outside the coil pattern simultaneously satisfies inequalities 1, 2, and 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&lE;R&lE;0.3 in the first region A1 where0&lE;S&lE;1.5P Inequality 2: 0&lE;R&lE;0.8 in a second region A2 where1.5PInequality 3: 0.33 where6.0P