Compatible optical pickup

摘要

An optical pickup compatible for recording media having different formats, in which two light beam sources for different wavelengths of light are installed in a single light device module. The optical pickup includes: a light device module (50) having a first light beam source (55) and a second light beam source (57) for emitting first and second light beams, respectively, having different wavelengths; a hologram light coupler (61) for separately guiding the first and second light beams along the same optical path such that the first and second light beams go toward a corresponding recording medium (80) ; an optical path changing element for altering the optical path of an incident light beam; and an objective lens (67) disposed on an optical path between the optical path changing element the corresponding recording medium (80), for focusing the first or second light beam on the corresponding recording medium (80); and a photodetector (71) for receiving the first or second light beam incident from the optical path changing element after having been reflected from the corresponding recording medium (80), and detecting an information signal and error signals from the received light beam.