Optical disk identifying method, manufacture of cartridge-enclosed optical disks, and optical disk cartridges
US4995029A · kind A · utility
24Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Oct 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk in a cartridge can be identified when loaded in a disk drive system, by changing the openness of a hole in the cartridge to impart at least four types of identifying information, and detecting the openness of the hole by a sensor in the drive system. To establish four different states, two small and large apertures are formed in major walls of the cartridge to define a through window and a shield member is fixedly or slidably mounted between the walls so as to clear or shield a portion or the entirety of the through window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.