Optical pickup in which at least one of a reflecting mirror and a beam splitter has a function of a phase difference plate
AssigneeMitsumi Electric Co., Ltd.
InventorsSatoshi Ajiki, Kouichi Hosoya
Life of this patent
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Abstract
In an optical pickup provided with an optical system including a reflecting mirror and a beam splitter, at least one of the reflecting mirror and the beam splitter having a base member and a film member attached to the base member to introduce a phase difference between an incident laser beam and an outgoing beam. A laser beam is emitted or radiated from a semiconductor laser. The laser beam is converged through the optical system to be focused on a signal recording surface of an optical disk. A return beam from the signal recording surface is detected through the optical system by a photodetector.
Claims10
An optical pickup in which a laser beam emitted or radiated from a semiconductor laser is converged through an optical system to be focused on a signal recording surface of an optical disk and a return beam from the signal recording surface is detected through the optical system by a photodetector, the optical system comprising:
- a reflecting mirror;
- and
- a beam splitter;
- at least one of the reflecting mirror and the beam splitter comprising:
- a base member;
- and
- a film member attached to the base member to introduce a phase difference between an incident laser beam and an outgoing beam.
Dependencies are inferred from the claim text.