| 摘要 |
A separation type optical pickup device for an optical information reading/writing apparatus using an optical recording medium. The device comprises a fixed optical system and a movable optical system. The fixed optical system is unmovable with respect to the recording medium and includes a laser beam source and has an opening through which the laser beam is output. The movable optical system is movable with respect to the recording medium and has an opening through which the laser beam is transmitted from the fixed optical system and includes a light guide for guiding the laser beam to the recording medium in a form of a convergent beam focussed on a surface of the recording medium. An expansible hollow member interconnects the fixed optical system and movable optical system in a state wherein the openings of the two systems as well as an optical path of the laser beam between the openings are enclosed by the hollow member.
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