MAGNETO-OPTICAL MEMORY ELEMENT

Title:

MAGNETO-OPTICAL MEMORY ELEMENT

Document Type and Number:

Japanese Patent JP3599789

Kind Code:

B2

Abstract:

PURPOSE: To obtain a magneto-optical memory element having a high recording density by setting the depth (d) in the groove parts of the magnetic memory element between specific multiple values of a ratio of the wavelength λ of a light beam and the refractive index (n) of a substrate and setting the ratio of the diameter L of a specific light beam and a track pitch (p) between the specific values.
CONSTITUTION: This magneto-optical disk is laminated with a transparent substrate 1, a transparent dielectric layer 2, a magneto-optical recording layer 3, a transparent dielectric layer 4, a reflection layer 5 and an overcoating layer 6 in this order. The substrate 1 has grooves for guiding a light beam 11 on at least one surface of the substrate 1 and the surface of the groove side transparent substrate 1 is provided with the optical recording layer 3. The width of the grooves and the width of the lands between the grooves are nearly equal. The depth (d) of the groove parts satisfies 0.13λ/n≤d≤0.18λ/n when the wavelength of the light beam is defined as λ and the refractive index of the substrate is defined as (n). The light intensity of the light beam for irradiation is 0.6≤L/p≤1.2 when the diameter of the light beam in the position where the light intensity of irradiation light beams attain 1/e2 of the light intensity at the center of the light beam is defined as L and the track pitch as p.

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Inventors:

Rishin Saegusa
Hiroyuki Katayama
Akira Takahashi
Kenji Ohta

Application Number:

JP19057394A

Publication Date:

December 08, 2004

Filing Date:

August 12, 1994

Export Citation:

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Assignee:

Sharp Corporation

International Classes:

G11B11/10; G11B11/105; (IPC1-7): G11B11/105

Domestic Patent References:

JP2158938A
JP4311840A
JP384748A
JP5109120A
JP765423A

Foreign References:

WO1995029483A1

Attorney, Agent or Firm:

Kenzo Hara
Ryuichi Kijima
Ichiro Kaneko
Takaya Koike
Masaharu Kinoshita

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