Patent · US Expired

System for adjusting a magnetic sensor to detect the presence of ferrous objects

US6127821A · kind A · utility

13Cited by
2References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 18, 1997
Grant dateOct 3, 2000
Priority date—
Expiry dateDec 18, 2017

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH03K17/9517
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A proximity detector that employs a Hall-effect flux sensor disposed between the like poles of two magnets. The opposing fields of the magnets define a null flux field at a sensing plane of the Hall-effect sensor. A proximate ferrous object will deflect the null point and will therefore apply flux to the sensor. The sensor generates a signal indicative of the presence or absence of the ferrous object. In manufacturing a preferred spatial position of the null point with respect to the Hall-effect sensor is defined by adjusting the field strength of at least one of the opposed magnets.

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