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Force Sensor Crystal Mounting

IP.com Disclosure Number: IPCOM000093364D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Watson, RA: AUTHOR

Abstract

Crystal 10 is a force transducer sensing element. The latter translates input forces F applied along its input axis 11 into proportional electrical signals across electrodes 12 located on its opposite faces. Electrodes 12 are connected to an oscillator circuit, not shown, of which it is part by conductors 13. The frequency of the oscillator circuit changes in proportion to the applied force.

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Force Sensor Crystal Mounting

Crystal 10 is a force transducer sensing element. The latter translates input forces F applied along its input axis 11 into proportional electrical signals across electrodes 12 located on its opposite faces. Electrodes 12 are connected to an oscillator circuit, not shown, of which it is part by conductors 13. The frequency of the oscillator circuit changes in proportion to the applied force.

In order either to increase the stability of the transducer or to mitigate the degrading effects of torsional or shear forces in the crystal or both, crystal 10 is pivotably mounted in a pair of diametrically opposed pivot mounts 14. Each mount 14 has a generally rectangular shaped member 15. The inner face of member 15 is provided with recess 16. The walls of recess 16 are contoured with the crystal's edge contour. Crystal 10 is rigidly mounted with the recesses of members 15 which are symmetrically aligned about input axis 11. The outer face of member 15 16. The walls of recess 16 are contoured with the crystal's edge contour. Crystal 10 is rigidly mounted with the recesses of members 15 which are symmetrically aligned about input axis 11. The outer face of member 15 is provided with a bearing surface recess 17 which can be coated with a hard, low friction layer or coating 18 as shown in cross-section in the upper member 15 at
B.

Within recess 17 are placed upper and lower pivot shafts 19 which are co- aligned with axis 11. Upper shaft 19 is co...