Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1998-12-04

2001-02-13

Kiliman, Leszek (Department: 1773)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

C428S336000, C428S690000, C428S690000, C428S690000, C428S690000, C428S900000

Reexamination Certificate

active

06187431

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording medium, and in particular to a magnetic recording medium which is capable of repeatedly carrying out recording, reading and erasing operations through magnetic heads, and suitable for a display device for displaying recorded images by applying light and a magnetic field to the magnetic recording medium.
2. Discussion of Background
A magnetic material which can exhibit the magneto-optical effects, such as Faraday effect and magnetic Kerr effect is conventionally used for the magneto-optical disk memory capable of recording, reading and erasing information.
A magnetic recording medium which employs the above-mentioned magnetic material with the magneto-optical effects can record an image therein, for example, through a magnetic head. Further, by utilizing the Faraday effect and Kerr effect of the above-mentioned magnetic material obtained by the application of light thereto, the application of the above-mentioned magnetic recording medium to a display device for displaying the recorded image has been studied.
However, there is not obtained any magnetic recording medium that can repeatedly carry out the recording, reading and erasing operations through the magnetic heads, and in addition to the above, that can display the recorded image with high contrast.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a magnetic recording medium which is capable of repeatedly carrying out the recording, reading and erasing operations through the magnetic heads, and further, is applicable to a display device that can display the recorded image with high contrast.
The above-mentioned object of the present invention can be achieved by a magnetic recording medium comprising a transparent substrate with a plurality of grooves which extend parallel with each other at regular intervals, each of the grooves having inner side walls perpendicular to the transparent substrate and a space between adjacent side walls being constant, a magnetic material layer extending in the form of a stripe, provided on the surface of the inner side walls of each of the grooves, and a pair of dielectric multi-layers which are disposed so as to sandwich the transparent substrate therebetween.
The aforementioned magnetic recording medium may further comprise a pair of polarizing layers, each disposed on an external side of each of the dielectric multi-layers.
The above-mentioned object of the present invention can also be achieved by a magnetic recording medium comprising a substrate with a plurality of grooves which extend parallel with each other at regular intervals, each of the grooves having inner side walls perpendicular to the substrate and a space between adjacent side walls being constant, a magnetic material layer extending in the form of a stripe, provided on the surface of the inner side walls of each of the grooves, a dielectric multi-layer which is provided on one surface of the substrate, a polarizing layer which is provided on the dielectric multi-layer, and a light reflection layer which is provided on the other surface of the substrate, opposite to the dielectric multi-layer with respect to the substrate.
It is preferable that each of the grooves have a depth of 0.1 to 5 &mgr;m, the space between adjacent side walls be in a range of 0.2 to 2.0 &mgr;m, and the magnetic material layer have a thickness of 5 to 100 nm.
It is preferable that the dielectric multi-layer comprise a plurality of laminated dielectric material layers.
Furthermore, an organic material is preferably used for the preparation of the dielectric material layers.
In addition, it is preferable that the magnetic material layer comprise a magnetic material selected from the group consisting of Fe, Co, Ni and an alloy thereof. Such magnetic materials may be used in the form of ultrafine particles with an average particle diameter of 20 to 200 Å.


REFERENCES:
patent: 5112701 (1992-05-01), Katsuragawa
patent: 5554451 (1996-09-01), Taki
patent: 5626965 (1997-05-01), Iide
patent: 5640374 (1997-06-01), Hirokane
patent: 5673251 (1997-09-01), Suzuki
patent: 5700540 (1997-12-01), Farruggia
patent: 5976667 (1999-11-01), Hiroki

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