Optical pickup apparatus capable of transferring objective lens in optical axial direction depending on thickness of disc for focusing respectively onto discs with different thicknesses

摘要

In optical pickup apparatus, a laser beam generated from the laser source is reflected from a beam splitting means via an objective lens toward an optical disc. The beam reflected from the disc is received so that information is reproduced. An objective lens positioning system is located around the objective lens, and has rack gears, pinion gears, and a fixed supporting part having a guide rail formed thereon. A motor driving part detects a thickness of the disc to move the objective lens positioning system when the disc is changed in thickness.