Patent ID: 6418104
Filing Date: 2002-07-09
Classification: G11B

Abstract:
A tilt detector adapted to be used for a storage medium provided with a recording track on which information is recorded and a first and a second header portions, each arranged in a manner shifted in opposite directions to each other from a center line of the recording track, said detector comprising:a light irradiation unit for irradiating a light beam onto the first header portion, the second header portion and the recording track; a light receiving unit having a first.light receiving surface and a second light receiving surface arranged adjacently to each other on both sides of a divisional line which is in parallel with the direction of the center line and for receiving the light beam reflected by the storage medium, the first light receiving surface outputting a first output and the second light receiving surface outputting a second output; an operation unit for executing an arithmetic operation of the first output and the second output to generate an operation result signal; and an error signal generation unit for generating a tilt error signal based on the operation result signal, the tilt error signal compensating a tilt between the storage medium and an optical axis of the light beam.