Patent · US Active

Magnet sensor arrangement for sensing the movement of element moving in linear or rotary fashion

US8120351B2 · kind B2 · utility

64Cited by

9References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rasmus Rettig · Gerlingen, DE
Christian Bauer · Neu-Ulm, DE
Birgit Vogelgesang · Bietigheim-Bissingen, DE

Key dates

Filing date	Jan 18, 2005
Grant date	Feb 21, 2012
Priority date	—
Expiry date	Jun 29, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/147
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A magnetic sensor arrangement (1), having magnetically sensitive sensor elements (7, 8) whose electrical properties are changeable as a function of a magnetic field that a moving, passive transmitter element (11) is able to influence. The magnetic sensor arrangement (1) has two sensor elements (7, 8) in a gradiometer arrangement that are each respectively associated with one of two magnetic regions (4, 5) of a permanent magnet embodied in the form of a gap magnet (2; 20; 23), which regions are spaced apart from each other by a predetermined distance (sa). The regions (4, 5) and the gap magnet (2; 20; 23)—in terms of the for example wedge-shaped embodiment, the dimensions (h, b, t), the gap width (sa), the gap depth (st), and their positions in relation to the sensor elements (7, 8)—are situated so as to minimize the offset of the output signal of the sensor elements (7, 8) in the gradiometer arrangement.

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