Patent ID: 8213288

Claim:
An optical information reproducing apparatus which irradiates a laser beam to an information recording medium and reads an information, said optical information reproducing apparatus comprising: a semiconductor laser which generates said laser beam; a laser drive unit which supplies a drive current on which a high-frequency current is superimposed to said semiconductor laser; a spindle motor which drives said information recording medium; and a control unit which controls said laser drive unit and said spindle motor, wherein said control unit determines a parameter of said high-frequency current based on magnitude of a current on which said high-frequency current is to be superimposed, said magnitude of said current on which said high-frequency current is to be superimposed is determined based on reproduction layer information indicating which one of information recording surfaces on said information recording medium is reproduced, said parameter of said high-frequency current is determined so that a ratio of a peak level value and an average level value of a light intensity of said laser beam (a peak level value/a average level value) is smaller in the case of reproducing an information recording surface at the farthest position from an incident surface of said laser beam than in the case of reproducing an information recording surface at the nearest position from said incident surface of said laser beam.