High density optical recording method and recording medium

Details High density optical recording method and recording medium High density optical recording method and recording medium

1993-10-18

1996-01-02

Hindi, Nabil Z.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369112, G11B 724

Patent

active

054815304

ABSTRACT:
Disclosed herein are an optical recording method of conducting recording/reading out for information by irradiating a laser beam at a wavelength of not more than 500 nm onto a recording layer of an optical disc having a track pitch of not less than 0.4 .mu.m and less than 0.9 .mu.m, the laser beam being incident from a disc substrate side of the optical disc using an objective lens having numerical aperture of 0.55 to 0.70, a recording area for information recording on the disc substrate being a flat area not having a guide groove for each track, and the disc substrate having a in-plane birefringence of not more than 20.times.10.sup.-6 and a vertical birefringence of not more than 300.times.10.sup.-6, and an optical recording medium suitable for use in the optical recording method.

REFERENCES:
patent: 4841508 (1989-06-01), Kimura
patent: 5281797 (1994-01-01), Tatsuno et al.
patent: 5353277 (1994-10-01), Yasuda et al.
J. Magn Soc. Jpn., vol. 15, Suppelment No. S1 (1991), pp. 365-368 Sumi et al "High Density Recording on . . . Blue Laser".
J. Magn. Soc. Jpn., vol. 15, Supplement No. S1 (1991) pp. 49-52 Takahashi et al "Double Layered Film for Shorter Wavelength Laser Recording".
Ullmann's Encyclopedia of Industrial Chemistry, vol. A14; Immobilized Biocatalysts to Isoprene, pp. 196-239, 1989.
Philips Technical Review, vol. 42, No. 2, Aug. 1985, "Erasable Magneto-Optical Recording" by Hartmann et al, pp. 37-47.
Philips Technical Review, vol. 44, May 1989, No. 8-10; "Phase-Change Optical Recording" by Gravesteijn et al, pp. 250-258.
Patent Abstracts of Japan, Sep. 1991, vol. 15, No. 364; JP 3-142730 with abstract.

Affiliated with

Also associated with

Rating

High density optical recording method and recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High density optical recording method and recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High density optical recording method and recording medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-241412