OPTICAL PICKUP DEVICE AND AN OBJECTIVE LENS FOR THE OPTICAL PICKUP DEVICE, ESPECIALLY RELATED TO PROPERLY RECORDING/REPRODUCING INFORMATION ON BOTH HIGH-DENSITY CD AND DVD AND EXISTING CD AND DVD

摘要

PURPOSE: An optical pickup device and an objective lens for the optical pickup device are provided to record and/or reproduce information on more than three different optical information recording media by using a light flux emitted from three light sources having different wavelengths. CONSTITUTION: An objective lens actuator device(10) comprises as follows. Objective lenses(109,209) condense laser beams into an information recording surface of other optical disk, respectively. A lens holder(13) retains and supports optical shafts of the objective lenses(109,209) on the same circumference(13A). A chassis(15) retains and supports such that the lens holder(13) rotates via a supporting shaft(14) installed in the middle of the circumference(13A) and reciprocally moves along a central shaft of the rotation. A focusing actuator reciprocally moves the lens holder(13) in a direction of the supporting shaft(14). A tracking actuator(20) presses the rotation of the lens holder(13), to determine positions of the objective lenses(109,209).