Optical Head Device, Optical Information Device, Optical Disc Player, Car Navigation System, Optical Disc Recorder, and Optical Disc Server

摘要

In an optical head device including a light source for emitting a light of a predetermined wavelength; a collimator lens for converting a divergence degree of the light; a folding mirror for folding a direction of the light emitted from the light source; an objective lens for converging the light on a recording surface of an optical disc; a photodetector for receiving the light reflected at the recording surface of the optical disc, and converting to an electric signal; and an optical path adjustment unit for guiding the light emitted from the light source to the collimator lens and guiding the light reflected at the recording surface of the optical disc to the photodetector; a wavelength plate for polarizing the light reflected by the folding mirror is arranged on an actuator base between the folding mirror and the objective lens.