Optical disc drive

Abstract

An optical disc drive according to the present invention includes: a laser light source 2 for emitting a laser beam; a photodetector 10 for detecting a signal that has been supplied from an optical disc 100; and an optical system 200 for irradiating the optical disc 100 with the laser beam and guiding the light reflected from the optical disc 11 to the photodetector 10. The drive further includes a memory 300 for storing information defining a relation between the output value of the photodetector 10 and the output power of the laser light source 2 when the laser light source 2 is emitting the laser beam but the light reflected from the optical disc 100 fails to reach the photodetector 10; and a control section 400 for controlling the output power of the laser light source 2 based on the information stored in the memory 300 and the output of the photodetector 10 when the laser light source 2 is emitting the laser beam but the light reflected from the optical disc fails to reach the photodetector 10.

Dependencies are inferred from the claim text.