Patent · US Expired

Apparatus for the contact-free continuous measurement and monitoring of magnetic tracks on moving film strips

US4346668A · kind A · utility

2Cited by

4References

21Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Friedmar Pohler · Bensberg, DE
Hans Falk · Leverkusen, DE
Josef Muller · Lakewood, US
Hans J. Klein · Wuppertal, DE
Franz Hoffacker · Langenfeld, DE

Key dates

Filing date	Feb 11, 1980
Grant date	Aug 31, 1982
Priority date	—
Expiry date	Feb 11, 2000

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/633
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The invention relates to an apparatus and a method of contact-free, almost continuous measurement and monitoring of the width, thickness and position of magnetic tracks on moving film strips within wide limits of the speed. The track width and track position of the magnetic tracks are measured optically and the magnetically acting track cross section is measured electromagnetically via the track volume. The measured values are together recorded, evaluated and displayed and/or used for recontrolling the casting arrangement for emitting warning signals or for stopping the coating machine.

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