Optical pickup device for reproducing discs of two types with di

Details Optical pickup device for reproducing discs of two types with di Optical pickup device for reproducing discs of two types with di

1997-04-25

1999-06-29

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369109, G11B 700

Patent

active

059178000

ABSTRACT:
A beam generated from a laser light source are reflected by a beam splitter to proceed toward an optical disc. The beam focus onto the optical disc via a selective light-transmitting part installed in front of the optical disc and an objective lens. The beam is totally transmitted through an inner circular portion of the selective light-transmitting part and half transmitted through a peripheral portion of the selective light-transmitting part. The beam transmitted through the inner circular portion forms the larger beam spot on the disc while the beam transmitted through the peripheral portion forms the smaller beam spot, so that spherical aberration to be occurred due to change of the thickness of the optical disc is minimized by using the beam with smaller numerical aperture which has transmitted through the inner circular portion of the selective light-transmitting part.

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