Method and apparatus for optical detection of cleaning medium in an information storage drive
US5369285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1993 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Dec 10, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system (20) and method for identification of medium (41) inserted into an information storage drive optically determines whether the medium is cleaning medium by determining the translucency of the medium. The system includes a dual infra-red LED light source (28) having a controllable intensity as well as BOT and EOT light receivers (30, 32). The medium longitudinally extends between the light source and the light receivers. A medium identification controller (48) determines the type of medium inserted into the information storage drive by progressively ramping the intensity of the light source and determining at what effective driving signal value the light receivers actually receive light through the medium, and by comparing the effective driving signal value for each receiver with a calibrated driving signal value at which the light receiver actually receives light when no medium is inserted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.