| 摘要 |
PURPOSE:To access a track at a desired speed irrespective of the installation angle of a device by compensating the drive force of a rough adjusting means corresponding to the angle and also compensating a signal from a constant means for driving a fine adjusting means. CONSTITUTION:A microcomputer 16 renders a sample holding circuit 22 to hold the sample of a DC in the normal state of a linear motor 6, which is detected through a low-pass filter 21 immediately after or before an access instruction is issued, and makes said circuit 22 detect substantially the inclination angle theta of the device. The microcomputer 16 closes a switch 23 being opened while it is driving the linear motor 16 for an access action with a tracking subloop opened, and permits constant circuits 24 and 25 to output a sample- held value. An electric current having a value corresponding to the compensation current Mgsintheta/K is added to the output of a differential amplifier 10 through the constant circuit 25 having a constant (y), and supplied to the linear motor 6 through a linear motor drive control circuit 11.
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