Static information storage and retrieval – Information masking – Polarization
Patent
1994-08-22
1995-05-09
Yoo, Do Hyun
Static information storage and retrieval
Information masking
Polarization
365215, 369 13, 360118, G11C 1306
Patent
active
054146526
ABSTRACT:
A magneto-optical memory element including: grooves, formed on at least one surface of a transparent substrate, for guiding a light beam; a magneto-optical recording layer formed on the surface of said transparent substrate on which the grooves are formed, wherein a width of each groove and a width of each land formed between the grooves are substantially equal, information is recorded on and reproduced from tracks on the grooves and the lands, and a groove depth d (track depth) is arranged such that 0.13.times..lambda.
.ltoreq.d.ltoreq. 0.18.times. .lambda.
, where .lambda. is a wavelength of the light beam and n is a refraction index of the transparent substrate. Assuming that a diameter of the light beam at a portion where a light intensity of the light beam becomes 1/e.sup.2 of a light intensity of the center of the light beam is L, a track pitch p is arranged such that 0.6.ltoreq.L/p.ltoreq.1.2. Therefore, even when the track density is increased, i.e., the width of the groove portion and the width of the land portion are reduced, a satisfactory signal quality with low level of crosstalk is obtained. Accordingly, such a magneto-optical disk achieves a high recording density.
REFERENCES:
patent: 5084860 (1992-01-01), Maeda et al.
patent: 5168482 (1992-12-01), Aratami et al.
patent: 5278810 (1994-01-01), Takahashi et al.
Katayama Hiroyuki
Mieda Michinobu
Ohta Kenji
Takahashi Akira
Conlin David G.
Fournier Kevin J.
Sharp Kabushiki Kaisha
Yoo Do Hyun
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