Patent · US Expired

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

US4276324A · kind A · utility

6Cited by

1References

9Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

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	Mar 19, 1979
Grant date	Jun 30, 1981
Priority date	—
Expiry date	Mar 19, 1999

Classification

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

Abstract

The invention relates to 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.