Optical grating for a bifocal access head of optical disk drive

Details Optical grating for a bifocal access head of optical disk drive Optical grating for a bifocal access head of optical disk drive

1997-02-11

1999-05-18

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, 369 94, 369112, G11B7/00

Patent

active

059057076

ABSTRACT:
A grating pattern for a bifocal optical pick-up head assembly of an optical compact disc drive device is disclosed. The device is capable of accessing data on the surface of compact discs arranged in either the DVD or the CD formats. The optical head assembly has an optical system that includes a grating plate and an objective, wherein the grating plate contains the grating pattern, and the objective focuses a light beam onto the data surface of the accessed compact disc. The grating pattern includes a first region that contains no grating and a second region that contains grating. The first region substantially surrounds the second region. The light beam that passes through the first region of the grating pattern is incident to the cross-sectional aperture of the objective for the DVD format of the accessed optical disk. The light beam that passes through the second region of the grating pattern is incident to the cross-sectional aperture of the objective for the CD format of the accessed optical disk.

REFERENCES:
patent: 5066138 (1991-11-01), Toide et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5636190 (1997-06-01), Choi
patent: 5671207 (1997-09-01), Park
patent: 5724335 (1998-03-01), Kobayashi

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