Disk device having a recording medium rotatable in a controlled stepwise manner in response to a reference clock signal of variable frequency
US6301070A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1998 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Nov 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A motor rotates a recording medium of a disk cartridge loaded in a disk device. A disk-type detecting unit detects whether the recording medium of the disk cartridge loaded in the disk device is a high-capacity recording medium or a low-capacity recording medium. A motor driving controlling unit causes the motor to rotate in accordance with a given reference clock signal, the motor driving controlling unit being set to a first mode for rotating the motor at a first rotation speed when the disk-type detecting unit detects that the recording medium of the loaded disk cartridge is the low-capacity recording medium and being set to a second mode for rotating the motor at a second rotation speed when the disk-type detecting unit detects that the recording medium of the loaded disk cartridge is the high-capacity recording medium, the second rotation speed being higher than the first rotation speed. A reference-clock-signal controlling unit, when the disk-type detecting unit detects that the recording medium of the loaded disk cartridge is the high-capacity recording medium, gradually increases a frequency of the reference clock signal to be provided to the motor driving controlling unit …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.