Patent ID: 6034936
Filing Date: 2000-03-07
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 beams 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;a light receiving means for receiving a laser beam reflected from said optical recording medium;an input read signal generating means for generating an input read signal relating to said recorded information based on an output signal from said light receiving means;a tracking error signal generating means for generating a tracking error signal based on the output signal from the light receiving means;an automatic level control means for providing control so as to maintain a constant signal level of said input read signal and outputting an output read signal; anda normalizing means for normalizing the signal level of said tracking error signal based on the signal level of said input read signal.