Retroreflective marker for data storage cartridge
US5638228A · kind A · utility
72Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1995 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Feb 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cartridge for a data storage disk drive has a retroreflective marker. Light from a source is reflected from the marker almost exactly on its incident path. This property makes possible unique identification of the cartridge with minimal senstivity to light reflected from other surfaces. The marker enables a disk drive enable circuit so that the drive cannot be used with improper cartridges which might damage it. Also, a retroreflective marker is used for write protection of the cartridge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.