Measuring device for contactless detecting a ferromagnetic object

US6922052B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinrich Steinruecken · Ludwigsburg, DE
• David Heisenberg · Gerlingen, DE
• Michael Schulz · Bexbach, DE
• Rasmus Rettig · Gerlingen, DE
• Martin Haas · Belgrade, US
• Klemens Gintner · Ludwigsburg, DE

Key dates

• Filing date: Feb 16, 2001
• Grant date: Jul 26, 2005
• Expiry date: Jun 30, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/147
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring device for contactless detection of a ferromagnetic object, comprising at least one magnet; a magnetic field-sensitive element arranged so that an air gap is provided between the magnetic field-sensitive element and the ferromagnetic object; and a soft-magnetic component located between magnet and the magnetic field-sensitive element on a face of the magnet which points in a direction of the ferromagnetic object to be detected, said soft-magnetic component being formed as a cap-shaped element that has a recess that is open in a direction away from said magnetic field-sensitive element to house the magnet and an opening that is open in a direction of the magnetic field-sensitive element, to house the magnet and opening that is open in a direction of the magnetic field-sensitive element, the soft-magnetic component having a first side wall defining said recess and also having a portion which forms a second side wall defining said opening, said first side wall and said second side wall being in alignment with one another.