Browse Prior Art Database

High Reliability Position Sensor

IP.com Disclosure Number: IPCOM000090986D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Darling, RH: AUTHOR

Abstract

The position sensor provides an indication of the location of a moving device. Ferrite memory core 12 is wound with several turns of wire to provide input winding 14. The latter is excited by oscillator 16 operating at or near the resonant frequency of the system. Output winding 18 is also provided on core 12. The output from winding 18 is sensed by device 20 such as an integrator amplifier. Permanent magnet 22 is positioned so that, when core 12 is in the position shown, such core is saturated thus reducing the coupling efficiency between windings 14 and 18 to provide an indication in the output voltage to device 20. In one application of the device, magnet 22 is placed on a movable print head carrier and the core assembly is located in movable margin stop brackets.

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High Reliability Position Sensor

The position sensor provides an indication of the location of a moving device. Ferrite memory core 12 is wound with several turns of wire to provide input winding 14. The latter is excited by oscillator 16 operating at or near the resonant frequency of the system. Output winding 18 is also provided on core
12. The output from winding 18 is sensed by device 20 such as an integrator amplifier. Permanent magnet 22 is positioned so that, when core 12 is in the position shown, such core is saturated thus reducing the coupling efficiency between windings 14 and 18 to provide an indication in the output voltage to device 20. In one application of the device, magnet 22 is placed on a movable print head carrier and the core assembly is located in movable margin stop brackets. Thus, when the print head is moved to a position so that core 12 is adjacent magnet 22, a signal is generated in amplifier 20 which indicates that the print head has entered the margin area.

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