Title:
MAGNETO-OPTICAL ANISOTROPY DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/1980/001016
Kind Code:
A1
Abstract:
Device for detecting magneto-optical anisotropy for optical reproduction of recorded information, in accordance with the magnetized state of a magnetic carrier, for the purpose of reproducing information with higher signal-to-noise ratio. A light source (10) generates elliptically polarized light, or light is polarized by means of elliptic polarization means (90A). The elliptically polarized light irradiates an information recording carrier consisting of a magneto-optical anisotropic material (20). The elliptic coefficient of the light passing through or reflected by the magneto-optical anisotropic material varies in accordance with the magnetized state of the material. The variation of the elliptic coefficient is detected by a photo sensor (34) through an analyser (33A), thereby reproducing the information recorded on the magneto-optical anisotropic material.
Inventors:
OJIMA M (JP)
YAMAMOTO M (JP)
YAMAMOTO M (JP)
Application Number:
PCT/JP1979/000272
Publication Date:
May 15, 1980
Filing Date:
October 26, 1979
Export Citation:
Assignee:
HITACHI LTD (JP)
OJIMA M (JP)
YAMAMOTO M (JP)
OJIMA M (JP)
YAMAMOTO M (JP)
International Classes:
G01N21/21; G02F1/09; G11B7/09; G11B11/105; G11C13/06; (IPC1-7): G11B11/10; G01R33/032; G02F1/09; G11C13/06
Foreign References:
| JPS3921960B1 | ||||
| JPS4632973B1 |
Other References:
Electronics, (1961-9-1) T. Lentz, etal (Magneto-optical readout of magnetic recordings), p. 36-39
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