Optical pickup having catadioptric objective lens

摘要

An optical pickup using a catadioptric objective lens is provided in which a light receptor and a light transmitter are integrated with a catadioptric objective lens. The optical pickup includes a unit (20) for emitting laser light to a recording medium (40) and detecting the light reflected from the recording medium and a catadioptric objective lens (30) including a first reflective area (30-1) for reflecting the light incident from the unit (20), a focusing area for focusing the light incident from the unit (20) as a focused spot, and a second reflective area (30-2) for reflecting the light reflected from the first reflective area (30-1) toward the focusing area, in which the first reflective area (30-1) and the focusing area form a first surface of the catadioptric objective lens (30) and the second reflective area (30-2) becomes a part of a second surface of the catadioptric objective lens (30) located in the vicinity of the unit (20), wherein the unit (20) and the catadioptric objective lens (30) are integrated and the light from the unit (20) is incident to the catadioptric objective lens (30) via the portions except the second reflective area (30-2) of the second surface. The optical pickup enables the components of the optical system to be compact and light and the optical pickup to be thin, which can be used as a slim device such as a notebook computer.