Patent · US Expired

Measuring method and measuring arrangement for determining the orientation ratio of flexible magnetic recording media

US5157259A · kind A · utility

1Cited by

2References

5Claims

0Family size

Assignee

BASF SE

Inventors

Rudolf Suettinger · Heidelberg, DE
Ursula Klein

Key dates

Filing date	Apr 1, 1991
Grant date	Oct 20, 1992
Priority date	—
Expiry date	Apr 1, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG01R33/1207
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The orientation ratio (R.sub.f) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (R.sub.f).

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