Shutter plate control device in a disc playback device
US4646285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Sep 30, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0317
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A shutter plate control device in a disc playback device energizes a shutter plate in a disc magazine case with opening and closing members provided in a main body of the disc playback device. The opening member engages with a shutter lever provided on the shutter plate in loading of the disc magazine case to move the shutter plate in a direction for opening an aperture formed in the disc magazine case for exposing the disc to a pickup head to enable the pickup head to read date recorded on the disc. The closing member engages with the shutter lever in loading of the disc magazine case to be displaced by the shutter lever and thereby permit the shutter lever to pass by without moving the shutter plate while it engages with the shutter lever in ejecting of the disc magazine case to move the shutter plate in a direction for closing the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.