| 摘要 |
PURPOSE:To vary the target speed setting frequency, by minimizing intervals of head movement to perform a precise speed control. CONSTITUTION:A seek instruction is sent to a microcomputer 3 from an upper device 1. In the microcomputer, the track address while the head follows up is stored preliminarily in a memory, and the difference between this track address and a target track address is calculated immediatrly. This difference is stored in a memory 5 of the microcomputer 3. Target speed data corresponding to the difference is taken out from the memory 5 and is sent from the microcomputer 3 to a DA converter 4. Target speed data Si converted to an analog voltage in this DA converter 4. The microcomputer monitors the difference quantity; and if this quantity is within a set range, the microcomputer sends target speed data to the DA converted in frequency corresponding to it. |
