Publication

CentoNewton : collage du bouton

Thomas Maeder
2015
Reports

Abstract

Ce document porte sur des essais complémentaires de collage du bouton de mise en force du capteur CentoNewton (version Bd'). Par rapport à la technique actuellement en production (dispense manuel en une étape), on a d'abord sérigraphié et pré-polymérisé un anneau de silicone pour garantir l'espacement bouton-membrane, puis déposé simplement une goutte de colle silicone, avec ou non une couche plus tendre entre le bouton et les piézorésistances. On ne remarque pas de différence majeure de la réponse du capteur entre les variantes, ni avec les capteurs produits selon le processus usuel.

Official source

https://infoscience.epfl.ch/entities/publication/89b56aa5-256a-4d93-923b-aef8dd0afe67

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Thomas Maeder
2015
Reports

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/89b56aa5-256a-4d93-923b-aef8dd0afe67

About this result

Related concepts (5)

Prepolymer

In polymer chemistry, the term prepolymer or pre-polymer, refers to a monomer or system of monomers that have been reacted to an intermediate-molecular mass state. This material is capable of further polymerization by reactive groups to a fully cured, high-molecular-mass state. As such, mixtures of reactive polymers with un-reacted monomers may also be referred to as pre-polymers. The term "pre-polymer" and "polymer precursor" may be interchanged.

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Piezoresistive effect

The piezoresistive effect is a change in the electrical resistivity of a semiconductor or metal when mechanical strain is applied. In contrast to the piezoelectric effect, the piezoresistive effect causes a change only in electrical resistance, not in electric potential. The change of electrical resistance in metal devices due to an applied mechanical load was first discovered in 1856 by Lord Kelvin. With single crystal silicon becoming the material of choice for the design of analog and digital circuits, the large piezoresistive effect in silicon and germanium was first discovered in 1954 (Smith 1954).