Patent ID: 7123561
Filing Date: 2006-10-17
Classification: G11B

Abstract:
1. A device that records information using a light on an optical disc, which is rotated at a constant speed by controlling a number of rotations per unit time used to record the information, the device comprising: a linear velocity detector that detects a linear velocity using a velocity of a spot of the, light, which records the information on a surface of the optical disc, in a tangential direction of a circumference of the optical disc; and an optical power controller that controls an optical power of the light that records the information to the optical disc based on the linear velocity detected by the linear velocity detector, wherein the linear velocity detector further comprises: a disc clock detector that detects a constant disc clock using tracks formed on the surface of the optical disc, even though a frequency of a length unit of the tracks previously recorded is on any position of the surface of tracks, and outputs a frequency corresponding to the linear velocity; and a frequency to voltage converter that converts the frequency of the disc clock detector into a voltage, wherein the optical power controller controls the optical power of the light to record the information on the surface of the optical disc based on the voltage.