Magnetoptic head for recording/erasing information using a cylin

Details Magnetoptic head for recording/erasing information using a cylin Magnetoptic head for recording/erasing information using a cylin

1989-09-05

1991-01-08

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 369 4422, G11B 1104, G11B 1114

Patent

active

049842269

ABSTRACT:
To reduce the size and thickness of a magnetooptic head, a single hollow cylindrical permanent magnet magnetized in the radial direction thereof is arranged at the center of a condenser lens. The axial component of the magnetic flux is available for an external magnetic field required for recording and erasing operations, while the radial component of the magnetic flux is available for a magnetic field required for focusing operation in cooperation with a cylindrical focusing coil arranged coaxially with the cylindrical magnet.

REFERENCES:
patent: 4747668 (1988-05-01), Meyer et al.
patent: 4759005 (1988-07-01), Kasahara

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