Patent · US Expired

Injection molding assembly for producing disk-shaped information carriers and sleeve for the axial retention and radial centering of a matrix

US5092759A · kind A · utility

13Cited by

2References

1Claims

0Family size

Assignee

KraussMaffei GmbH · DE

Inventors

Peter Lichtinger · Fürstenfeldbruck, DE
Gabrial Ringelstetter · Munich, DE

Key dates

Filing date	Nov 16, 1990
Grant date	Mar 3, 1992
Priority date	—
Expiry date	Nov 16, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S425/812
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A bushing for the axial retention and radial centering of a matrix in an injection mold for producing information carriers such as CD's is formed on the underside of its retention shoulder with channels for carrying away the air which tends to be compressed along the outer edge of the shoulder, thereby eliminating streaks or so called schlieren in the information-carrier disk which is produced.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.