Seek and track control for a rectangular optical card handling apparatus
US5059774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1988 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Oct 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08517
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for handling an optical card which is generally rectangular in shape and formed with a first plurality of circular, concentric recording tracks and a second plurality of arc-shaped, concentric recording tracks in each of a pair of sectors defined by a pair of hypothetical diagonal lines of the card and located outside of the first plurality of circular, concentric recording tracks. An optical pick-up is moved to a desired track first by a coarse seek operation which uses the difference between a selected count and the count from a linear sensor, and a fine seek operation which uses the sum of a track correspondence voltage and a track error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.