Optical disc system having an objective lens with a numerical ap

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

1996-03-08

1998-05-26

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692755, G11B 1100

Patent

active

057577331

ABSTRACT:
A magneto-optical disc system includes a magneto-optical disc 40 with a light-transmitting cover 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 cover 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.

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patent: 4926403 (1990-05-01), Tsuyuguchi et al.
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patent: 5202880 (1993-04-01), Lee et al.
patent: 5276674 (1994-01-01), Tanaka
patent: 5287334 (1994-02-01), Iwabuchi et al.

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