Track-number computing equipment for CLV disk drives
US5195068A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1989 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Sep 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2545
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Track-number computing equipment for CLV disc drives used for positioning a pick-up on a target track. This equipment reads time data written on a disc, and computes the number of tracks from a reference track to the target track by using the time data. The time data is separated into high-order time data whose interval, for example, is 10 minutes, and low-order time data. Each high-order time data is associated with a pair of an offset value and a coefficient which are stored in a memory. Each offset value represents the track number corresponding to the high-order time data and each coefficient represents the rate at which the track number increases with the increase of the low-order time data. In computing the track number to the target track, the equipment reads the time data from the disc, splits it into the high-order and low-order time data, reads the offset-value and the coefficient corresponding to the high-order time data from the memory and computes the linear equation specified by the offset value and coefficient. This linear equation approximates the relationship between the low-order time data and the track number. The equipment finally obtains the track number to the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.