Method and apparatus capable of identifying different types of disk-shaped information storage media
US6414924B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a method and apparatus for automatic type discrimination of differently sized disk-shaped information storage media, wherein pulses in a signal generated during the initial rotation and the associated elapsed time are counted and used to detect the size of the disk-shaped information storage medium. The method according to this invention comprises the steps of detecting signals produced from a driving unit for rotating a disk-shaped information storage medium; and identifying the type of the disk-shaped information storage medium according to the size thereof on the basis of comparison of the detected signal with a reference signal. This invention enables to detect the size of the disk-shaped information storage medium in a shorter period time compared to the conventional art because the initial time duration needed to get a desired stable rotation speed, which depends on the size of the disk-shaped information storage medium, is no longer required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.