Magneto-optical head unit capable of compensating the Kerr ellip

Details Magneto-optical head unit capable of compensating the Kerr ellip Magneto-optical head unit capable of compensating the Kerr ellip

1998-03-03

1999-12-14

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, G11B 1100

Patent

active

060026537

ABSTRACT:
A magneto-optical recording medium has a substrate and a magneto-optical recording film. The substrate is formed from material having light transmittivity. On one surface of the substrate there is provided a magneto-optical recording film. In said one surface of the substrate where the magneto-optical recording film is provided, when a wavelength of a light beam, irradiated on the magneto-optical recording medium, is .lambda., there are formed grooves having an optical depth where its lower limit is .lambda./8 and its upper limit is .lambda./4 or less. The magneto-optical recording film is formed so that the Kerr ellipticity thereof becomes 0.degree.. A head unit for the magneto-optical recording medium has an optical-axis device for compensating the Kerr ellipticity of the magneto-optical recording medium, the optical-axis device being disposed in an optical path between an object lens for focusing a light beam emitted from a light source on the magneto-optical recording film and a polarization beam splitter.

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