Magnetooptic recording and erasing head which performs biasing,

Details Magnetooptic recording and erasing head which performs biasing, Magnetooptic recording and erasing head which performs biasing,

1987-07-27

1989-09-19

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 44, 369 45, 360114, G11B 412, G11B 1304, G11B 7095

Patent

active

048688029

ABSTRACT:
To minimize the size and thickness of a magnetooptic head, a plurality of permanent magnets are arranged symmetrical with respect to the center of a condenser lens in such a way that the magnetic flux extends in both axial and radial directions of the condenser lens or that the same magnet poles are confronted each other. The axial magnetic flux is available for external magnetic field required for recording and erasing operations; while the radial magnetic flux is available for a magnetic field required for focusing and tracking operation is cooperation with focusing and tracking coils. In addition, part of the radial magnetic flux is available for lens position detection in cooperation with Hall elements to generate a lens position signal.

REFERENCES:
patent: 4419614 (1983-12-01), Kimura
patent: 4643522 (1987-02-01), Takashima
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4734899 (1988-03-01), Van Sluys
patent: 4736353 (1988-04-01), Kasai et al.
patent: 4759005 (1988-07-01), Kasahara
patent: 4764911 (1988-08-01), Morota et al.
patent: 4769803 (1988-09-01), Yamamiya

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