Optical disk system having an objective lens with a numerical ap

Details Optical disk system having an objective lens with a numerical ap Optical disk system having an objective lens with a numerical ap

1997-07-09

1998-11-17

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 3692755, G11B 724

Patent

active

058386564

ABSTRACT:
A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting layer 41, an objective lens 2 for bundling or focusing a laser beam onto a magnetic recording layer 43 of the magneto-optical disc 40 for recording information thereon and/or reproducing information therefrom, and a magnetic field generating unit 9 having a coil pattern 7 arranged on an optical glass element 8. The thickness t.sub.2 of the light-transmitting layer 41 falls within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens 2 falls within the range of 0.55 to 0.70.

REFERENCES:
patent: 4449138 (1984-05-01), Ando
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 4922454 (1990-05-01), Taki
patent: 4926403 (1990-05-01), Tsuyuguchi et al.
patent: 5255260 (1993-10-01), Yamada et al.
patent: 5276674 (1994-01-01), Tanaka
patent: 5392263 (1995-02-01), Watanabe et al.

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