Optical pickup

摘要

An optical pickup is capable of recording on and reproduction from recording media of different recording densities, and has a compact, thin and of low power-consumption design. The optical pickup, which is capable of recording on and reproduction from a high-density optical disk (17) and a low-density optical disk, includes an objective lens (16), a first optical unit (4) having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the high-density optical disk, a second optical unit (8) having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the low-density optical disk, a beam splitter (10) for guiding optical axes of the first and second optical units to the same optical axis, and a wavelength filter (15) for changing a diameter of light beams incident on the objective lens between at the time of recording and reproduction for the high-density optical disk and at the time of recording and reproduction for the low-density optical disk.