| 摘要 |
A position control apparatus for controlling positions of rotary heads with respect to a recording medium, comprises a pulse generating circuit and a head displacing mechanism. A rotary body is mounted with the rotary heads, and two or more rotary heads simultaneously scan over the recording medium at one time. The pulse generating circuit is responsive to a rotation detection pulse signal which is in phase with a rotation of the rotary body, and generates a pulse signal having a phase and pulse width essentially equal to a recording or reproducing time period in which one corresponding rotary head among the rotary heads records or reproduces a signal on or from the recording medium, with respect to each of the rotary heads. The displacing mechanism is provided in correspondence with each of the rotary heads, and separates from a recording surface of the recording medium rotary heads excluding one rotary head which is to carry out a recording or reproduction during essentially the entire time period in which the one rotary head scans over the recording medium, responsive to output pulse signals of the pulse generating circuit.
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