Laser power controller and optical disk device

摘要

The controller comprises a reflected light detector (106) for detecting the light reflected from the optical medium, when the light beam is made to follow a track of the optical medium. A calculating unit (118) evaluates the transmittance to light from the surface of the disk to a recording layer, by using the reflected light or the light beam intensity at the recording layer. A power control (108) regulates the beam power of the source, from the calculation unit results. An independent claim is included for an optical disk drive.