Optical recording method for data cards
US4910725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1986 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Oct 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of recording data on a card in which track indicia are laser recorded by a user on at least one end of a card prerecorded with tracks only. Track indicia include start and stop marks defining usable recordable areas, synchronization marks, error codes and track numbers and track termination codes. Start and stop marks may be series of lines recorded in a pattern across the tracks and in addition to demarcating usable recordable areas of the card may indicate the location of track numbers and data areas as well as the particular encoding scheme used on the card. Data blocks may be written on entire tracks or in sectors. When recording errors are detected, the data block is rewritten in a new sector or on another track using the same track number.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.