Patent ID: 6414913
Filing Date: 2002-07-02
Classification: G11B

Abstract:
An optical disc recording apparatus comprising:irradiating means for irradiating with a light beam a main data string comprised of repeated pits and lands recorded on an information recording surface of a disc recording medium; detection means for detecting the repeated pits and lands of said main data string based on a reflection of said light beam from said information recording surface; numeric string generating means for generating a predetermined numeric string based on the repeated pits and lands detected by said detection means; timing prediction means for predicting a timing when said light beam irradiates the repeated pits and lands; and recording means for recording a sub-data string on said disc recording medium by changing the reflectance of said information recording surface; said recording means recording 1 bit of said sub-data string over a plurality of the repeated pits and lands; said recording means having light quantity switching means for temporarily increasing an intensity of said light beam to locally change the reflectance of said information recording surface based on said timing predicted by said timing prediction means, said predetermined numeric string, and said sub-data string.