Dual output magnetic sensor
AssigneeHoneywell Inc.
InventorRonald G. Kohlbauer
Life of this patent
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Abstract
A dual output magnetic sensor employing a magnet having first and second poles and a pair of magnetic sensors one of which is located close to a first of the poles and the other of which is located a spaced distance from the second of the poles to form a gap and wherein first and second magnetic field shunting members are operable to move to positions away from and close to the sensors, one of the members passing adjacent to but outside of the first magnetic sensor and the second of the members passing through the gap.
Claims20
Dual magnetic sensing apparatus comprising:
- a magnet having first and second poles;
- a first magnetic sensor mounted proximate the first pole a first distance therefrom;
- a second magnetic sensor mounted proximate the second pole a second distance therefrom;
- a first magnetic field shunting member mounted for motion past the first pole at a distance greater than the first distance to increase the field strength sensed by the first sensor;
- and
- a second magnetic field shunting member mounted for motion past the second pole at a distance less than the second distance to decrease the field strength sensed by the second sensor.
The method of producing a pair of pulsed outputs from a single magnet having first and second poles comprising the steps of:
- A. mounting a first magnetic sensor a first distance from the first pole;
- B. mounting a second magnetic sensor a second distance from the second pole;
- C. moving a first magnetic field shunting member past the first pole at a distance greater than the first distance to increase the magnetic field sensed by the first sensor;
- and
- D. moving a second magnetic field shunting member past the first pole at a distance less than the second distance to decrease the magnetic field sensed by the second sensor.
Dual magnetic sensing apparatus comprising:
- housing means comprised of non-magnetic material, the housing means formed to provide first and second body portions with a gap therebetween;
- a permanent magnet mounted within the first body portion of the housing means with a first pole proximate the gap and a second pole remote from the gap;
- first magnetic sensing means mounted within the first body portion proximate the second pole;
- second magnetic sensing means mounted within the second body portion;
- and
- conductive means connected to the first and second sensing means and extending out of the housing means.
Dependencies are inferred from the claim text.