Claims
- 1. A linear positional placement detector comprising:
- a magnetic sensor unit having a magnetic sensing surface formed by a ferromagnetic magnetoresistance element shaped as a pair of serpentine patterns combined at right angles;
- an elongated permanent magnet having a longitudinal axis and a magnetic pole face at each end thereof, said permanent magnet being movable along said longitudinal axis and disposed in opposition to said magnetic sensor unit with said longitudinal axis positioned in a plane of said magnetic sensing surface, wherein a positional displacement of said permanent magnet along said longitudinal axis is detected as a change in the direction of a magnetic flux crossing said magnetic sensing surface in parallel thereto; and
- wherein a diameter to length ratio of said permanent magnet and a distance between said magnetoresistance element and said permanent magnet are arranged so that angular change of the magnetic flux parallel to and crossing the magnetic sensing surface of said ferromagnetic magnetoresistance element with respect to longitudinal positional displacement of said permanent magnet is 6.+-.3 deg/mm, said diameter to length ratio lying in a range from 0.10 to 0.60, and
- wherein a magnet field strength produced by said permanent magnet is at least 100 G.
Priority Claims (3)
Number |
Date |
Country |
Kind |
4-019871 |
Feb 1992 |
JPX |
|
4-019873 |
Feb 1992 |
JPX |
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5-008087 |
Jan 1993 |
JPX |
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Parent Case Info
This is a continuation-in-part of application No. 08/013,086 filed Feb. 3, 1993, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0145882 |
Jun 1985 |
EPX |
3148754 |
Aug 1982 |
DEX |
4014885 |
Nov 1990 |
DEX |
0109209 |
Apr 1989 |
JPX |
36089 |
Oct 1990 |
JPX |
Non-Patent Literature Citations (1)
Entry |
The Magnetoresistive Sensor, by August Petersen, Electronic Components & Applications, vol. 8, No. 4 1988, pp. 222-239. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
13086 |
Feb 1993 |
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