Patent ID: 6760180
Filing Date: 2004-07-06
Classification: G11B

Abstract:
A servo track writer for writing a servo track signal to a disk medium in a disk drive including said disk medium, a head for reading/writing information from/to said disk medium, and an internal actuator for moving said head across tracks formed on said disk medium, said internal actuator having a rotatable carriage for supporting said head, said servo track writer comprising:an external actuator having an arm having substantially the same rotational axis as that of said carriage, a drive unit for rotating said arm, a solid deformation element provided in relation to said arm, and an effector mounted on said arm and adapted to come into contact with said carriage; an internal actuator control unit for controlling said internal actuator; an external actuator control unit for controlling said external actuator; a solid deformation element control unit for controlling said solid deformation element; an arm position detecting device for detecting a position of said arm; and said solid deformation element being divided into at least a first segment and a second segment, said first segment functioning as an actuator for minutely displacing said carriage, said second segment functioning as a sensor for detecting a position of said effector.