Magneto-optical disk

Details Magneto-optical disk Magneto-optical disk

1995-06-02

1997-04-15

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 644, 428 646, 428694ML, 428694SG, 428900, 369 13, 369277, 369283, 369286, G11B 566

Patent

active

056207662

ABSTRACT:
A magneto-optical disc includes a pit forming region and a groove forming region on a surface of a substrate and a recording layer covering the pit and groove forming regions. The pit forming region includes a row of pits having a width of 0.40-0.55 .mu.m and a depth of 600-900 .ANG. and the groove forming region includes a spiral groove having a width of 0.95-1.15 .mu.m and a depth of 600-900 .ANG.. The disc is recorded and read by using an optical head with an objective lens having a numerical aperture of 0.40 to 0.50 and directing linearly polarized laser light having a wavelength of 600 to 900 nm to the disc such that its electric field vector has a direction perpendicular to the groove and the pit row. Tracking, seeking and information retrieval can be done with minimal errors using the same laser light beam in both the pit and groove forming regions.

REFERENCES:
patent: 4852076 (1989-07-01), Ohta et al.
patent: 4990388 (1991-02-01), Hamada et al.
patent: 5161150 (1992-11-01), Namba et al.
patent: 5244706 (1993-09-01), Hirata et al.
patent: 5244774 (1993-09-01), Usami et al.

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