Method and apparatus for the acoustic improvement of the pulsed current method for controlling the velocity of a transducer head
US6950272B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2000 |
| Grant date | Sep 27, 2005 |
| Priority date | — |
| Expiry date | Jan 16, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for reducing the acoustic output of a computer disk drive during a load or unload operation are provided. According to the invention, a pulse train having pulse widths that vary from one pulse to the next is provided to a voice coil motor while the transducer head is being loaded to or unloaded from the surface of the disk. According to one embodiment of the present invention, a proportional term equal to the inverse of the pulse width is supplied to the controller such that, with all other inputs to the controller being equal, a pulse train having pulses of equal total power are produced. By providing pulses of varying widths, the acoustic output of the disk drive is spread among multiple frequencies, and the amplitude at any one frequency is diminished as compared to a pulse train having pulses of equal width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.