G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 13/04 (2006.01) G11B 11/105 (2006.01) H03K 17/66 (2006.01) H03K 17/687 (2006.01)
Patent
CA 1319986
ABSTRACT: Magneto-optical recording apparatus and energizing circuit for use in such a magneto-optical recording apparatus. A magneto-optical recording apparatus provided with a magnetic field modulator (8) is revealed. The magnetic-field modulator (8) comprises a field coil (18) for generating a magnetic field and switching means (11,12,15,16,22) for coupling at least one terminal (17) of the magnet coil (18) to a first potential point (10) at a first potential (Vp) or a second potential point (14) at a second potential (Vn) depending on the logic value of a control signal (Vs), in order to produce in the field coil an alternating current whose polarity depends on the logic value. The field coil (18) is arranged in a parallel resonant circuit (18,21). The switching means comprise means (12,16) for inhibiting, after the terminal (17) has been uncoupled from one of i the potential points (10,14), decoupling to the other potential point for a time interval corresponding to half the resonant period of the resonant circuit (18,21). This magnetic-field modulator provides a very rapid reversal of the current through the field coil.
580694
Bakx Johannes Leopoldus
Hoeven Petrus Christianus Johannus
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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