Patent ID: 6167007
Filing Date: 2000-12-26
Classification: G11B

Abstract:
An optical recording medium reproducing apparatus for reproducing information recorded on an optical recording medium with a plurality of pits formed along recording tracks based on said recorded information, comprising:a laser beam emitting means for emitting a laser beam;a focus control means for controlling the focusing of said laser beam on said optical recording medium;a control means for controlling said focus control means so as to increase the spot diameter of the laser beam emitted onto said optical recording medium when the medium has a low recording density with pits relatively sparsely arranged compared to the case in which the medium has a high recording density with pits relatively densely arranged, whereinsaid control means supplies different focus bias values to said focus control means depending upon whether said optical recording medium has a high or a low recording density, anda storage means for storing high and low recording density focus bias values.