A magnetic head position control apparatus for driving the magnetic head (2) of a disc recording apparatus toward or away from the recording surface of a magneto-optical disc (5) to effect position control of the magnetic head. Changes in the distance between the magnetic head and the magneto-optical disc are detected from changes in capacitance between a capacitance detection electrode (6) mounted on the magnetic head and a surface of the magneto-optical disc. An oscillator circuit (7) connected to the capacitance detection electrode varies its oscillation frequency in response to changes in capacitance and detects such frequency variations and controls the position of the magnetic head for maintaining it at a constant predetermined distance from the magneto-optical disc. <IMAGE>
申请公布号
EP0635827(A1)
申请公布日期
1995.01.25
申请号
EP19940202599
申请日期
1990.08.17
申请人
SONY CORPORATION
发明人
OKA, NOBUYUKI, C/O SONY CORPORATION;ETO, HIROSHI, C/O SONY CORPORATION;YASUDA, NOBUYUKI, C/O SONY CORPORATION;YOKOTA, TETPEI, C/O SONY CORPORATION