Spacer for stacked recorded discs
US4316281A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1980 |
| Grant date | Feb 16, 1982 |
| Priority date | — |
| Expiry date | Sep 22, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spacer for use between two adjacent recorded discs in a stack of the discs includes a flat, circular, relatively rigid plate having opposed major surfaces and a hole through the center thereof. The plate has portions around its peripheral edge and the edge of the hole which are thicker than the rest of the plate and project beyond the major surfaces of the plate. The thicker portions of the spacer engage unrecorded surface portions of the adjacent recorded discs so as to space the recorded portions of the adjacent recorded discs from the major surfaces of the spacer plate to prevent dust, dirt and other contaminating particles from being pressed into or against the recorded portions of the recorded discs which may damage the recorded discs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.