Digital video disc pick-up head system

Details Digital video disc pick-up head system Digital video disc pick-up head system

1997-01-23

1998-04-28

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

057454655

ABSTRACT:
A digital video disc optical pick-up head system has a laser light source, a beam splitter, a collimating len, a polarization changer, a deflecting mirror, an optical crystal assembly, an objective len and a photosensor assembly. These optical components together constitute an optical pick-up head system that generates only a single focus at any one time. When an alternative focus is required, polarized light of an alternative polarization is used for generating a detectable opto-electrical signal for the photosensor.

REFERENCES:
patent: 4507773 (1985-03-01), McCann et al.
patent: 5237549 (1993-08-01), Shimozawa
patent: 5418774 (1995-05-01), O'Hara et al.
patent: 5442615 (1995-08-01), Ohsato et al.
patent: 5523994 (1996-06-01), Ando et al.

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