Patent · US Expired

Magnetic disk substrate with a core of synthetic material

US4415634A · kind A · utility

0Cited by

2References

3Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Holger Hinkel · Böblingen, DE
Ulrich Kuenzel · Tübingen, DE
Erhard Max · Sindelfingen, DE
Jochen Schneider · Tettnang, DE

Key dates

Filing date	May 24, 1982
Grant date	Nov 15, 1983
Priority date	—
Expiry date	May 24, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/12903
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A substrate for a magnetic recording disk employs an annular core of synthetic material having thin metal foils bonded to opposite faces, the metal foils serving to receive a magnetic recording material to form a magnetic recording structure. The inner surfaces of foils which are bonded to the core faces have applied thereto a thin, soft, deformable layer such as copper to prevent irregularities in the core faces from affecting the outer surfaces of the metal foils.

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