Method and apparatus for controlling bias levels in a magneto-op

Details Method and apparatus for controlling bias levels in a magneto-op Method and apparatus for controlling bias levels in a magneto-op

1995-06-07

1998-02-24

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1100

Patent

active

057217149

ABSTRACT:
An apparatus for controlling a magnetic field strength of a bias coil at a focal point of a lens during recording on a medium. The apparatus includes a first controller for determining a distance between the focal point of a lens and a reference point on the recording media. A source generates a stray magnetic field having a stray field strength at the focal point. A second controller calculates a digital signal which is a function of the distance and the stray field strength. A digital-to-analog converter converts the digital signal to a driver voltage and passes the driver voltage to a current driver, which drives the bias coil. The magnetic field strength of the bias coil is thereby controlled at a predetermined value. A method is also shown for controlling the strength of a magnetic field, including the steps of determining a distance between the focal point of a lens and a reference point on the recording media, generating a stray magnetic field strength at the focal point, calculating a digital signal which is a function of the distance and stray magnetic field, converting the digital signal to a driver voltage, and applying the driver voltage to a current driver to provide a bias current to the bias coil, thereby controlling the magnetic field strength at a predetermined value.

REFERENCES:
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patent: 5179544 (1993-01-01), Hezemans et al..
patent: 5191562 (1993-03-01), Hensing et al.
patent: 5392273 (1995-02-01), Masaki et al.
patent: 5481510 (1996-01-01), Masaki et al.
patent: 5485435 (1996-01-01), Matsuda et al.

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