Magnetic head device having photo detector cell

Abstract

A magnetic head device for recording signals onto a disk-shaped recording medium such as a floppy disk and reproducing them therefrom is provided. This magnetic head device comprises a magnetic converter unit for conversion of signals to and from a recording medium, a slider member for holding the magnetic converter unit, and a base body on which an optical track position sense unit for optically conducting track position control for the recording medium is affixed. The slider member has a transparent slider surface portion forming an optical path of the optical track position sense unit. A photo detector head chip for servo control used in a magnetic head device as mentioned above is also provided. This photo detector head chip is such that a plurality of light receiving element sections defining a light sensitive area for providing independent light detection signals depending upon a quantity of incident light, and light insensitive sections adjacent to the light sensitive area are alternately formed on the substrate surface, and that at least the light insensitive sections are covered thereon with a light shielding film of, for example, molybdenum or carbon having a small coefficient of reflection. The light shielding film may be formed by a method including the steps of depositing a light shielding material onto an insulating film on the light sensitive and insensitive sections, and applying patterning to the deposited light shielding material so that the light sensitive area is exposed.