Patent ID: 7486596
Filing Date: 2009-02-03
Classification: G11B

Abstract:
1. A method of compensating for a tilt in a recording and/or reproducing apparatus, the method comprising: obtaining one of a jitter best, an RF envelope, and a focus DC offset (FODC) from a detection signal of a ROM data region of a medium, as an obtained value; determining whether the obtained value is within a tolerance range; and obtaining an initial skew compensation value using the obtained value when the obtained value is within the tolerance range, and changing a magnitude of current applied to an actuator performing driving in at least three-axis directions to drive an objective lens of an optical pickup assembly in a radial tilt direction when the obtained value is not within the tolerance range and repeating the obtaining of the one of the jitter best, the RF envelope, and the FODC and the changing of the magnitude of the current until the obtained value is within the tolerance range, wherein the medium is a recordable-type unrecorded medium, and the method further comprises obtaining an FODC or a tilt angle calculated from an FODC at a plurality of points while moving the optical pickup assembly from inner to outer areas of the optical information storage medium in order to provide active tilt compensation at each position of the optical pickup assembly.