Optical pickup system for reading or writing information on disk

Details Optical pickup system for reading or writing information on disk Optical pickup system for reading or writing information on disk

1995-02-24

1996-10-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4442, 369110, 369112, G11B 7095

Patent

active

055684572

ABSTRACT:
An optical pickup system simply formed to improve readout speed and reduce manufacturing cost having a semiconductor laser light source, a polarizing beam splitter (PBS), a collimator lens for changing the laser beam into parallel beams, a reflection mirror, an objective lens, a photodetector divided-by-six for detecting tracking and focus errors, a hologram device, a bisectional photodetector, a Wollaston prism for separating a beam into P-wave and S-wave components from a mixed beam of P-wave and S-wave components from the PBS, and a focusing lens for focusing the P-wave and S-wave component beams separated by the Wollaston prism onto two sections of the bisectional photodetector.

REFERENCES:
patent: 5189655 (1993-02-01), Ogata et al.
patent: 5483509 (1996-01-01), Yang et al.

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