Magnetic bias coil for a magneto-optical recording apparatus

Details Magnetic bias coil for a magneto-optical recording apparatus Magnetic bias coil for a magneto-optical recording apparatus

1988-03-31

1989-12-26

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

369 13, G11B 5127, G11B 700

Patent

active

048901784

ABSTRACT:
An electromagnetic bias coil for applying a magnetic bias field to a recording bit of a magneto-optical recording disk apparatus includes a yoke made of soft magnetic material, such as soft iron. The yoke surrounds an outer perimeter surface and a bottom surface of the coil. A light beam and optical system are arranged in an opening in the yoke. The yoke reduces the magnetic resistance of the coil, increases the magnetic field intensity at the recording bit, and reduces the current needed to achieve an adequate magnetic field intensity. The operating temperature of the coil is therefore improved.

REFERENCES:
patent: 4803674 (1989-02-01), Nakao et al.

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