Method and apparatus for controlling revolution speed of spindle motor in optical disk drive
US6295261A · kind A · utility
25Cited by
1References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling a revolution speed of a spindle motor in an optical disk drive. Target RPMs and actual PWM signal values for maintaining the target RPMs are calculated according to recording linear velocities of an optical disk, and stored in a memory. The spindle motor is controlled by a PWM signal value greater than an actual PWM signal value for maintaining a desired target RPM, until an RPM of the spindle motor reaches the target RPM. Further, the spindle motor is controlled by the actual PWM signal value for maintaining the target RPM, when the RPM of the spindle motor reaches the target RPM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.