Optical pick-up head having polarizing beam splitter

Details Optical pick-up head having polarizing beam splitter Optical pick-up head having polarizing beam splitter

1994-10-27

1997-08-12

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, G11B 700

Patent

active

056573065

ABSTRACT:
An optical pick-up head for reading information recorded on an opto-magnetic record medium including a laser light source emitting a linearly polarized beam, a beam splitter for transmitting a part of the laser beam, and an objective lens for projecting the laser beam transmitted through the beam splitter onto the record medium. A return laser beam reflected by the record medium is collected by the objective lens and is made incident upon the beam splitter. A part of the return laser beam is reflected by the beam splitter and is made incident upon a converging lens. A converged laser beam emanating from the converging lens is made incident upon a polarizing beam splitter which is formed by a single optical body such as plate or prism and has a polarizing plane applied on a surface of the optical body. The converged laser beam is made incident upon the polarizing plane at an incident angle or refraction angle of 70.degree..+-.10.degree.. Then, the laser beam is separated into P- and S-polarized beams which are received by respective light receiving elements. The information is reproduced by deriving a difference between outputs of these light receiving elements.

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