Eta Sa Manufacture Horlogere Suisse

Thomas Luethi

Silvio Dalla Piazza

Bruno Studer

The piezoelectric resonator according to the invention includes a tuning fork shaped part with two parallel vibrating arms, connected to each other by a linking part, from which protrude a central arm located between both vibrating arms of the tuning fork shaped part, the vibrating arms carrying first electrodes to make them vibrate, these electrodes being connected to connection elements carried by the central arm, wherein a slot has been cut within the linking part opposite to the central arm and wherein second electrodes have been arranged along said slot.

Small-sized piezoelectric resonator

The invention concerns an assembly comprising a piezoelectric resonator and a case, said case including a main part with a bottom and sides, in which said resonator is mounted and a cover fixed to said main part, said resonator including a tuning fork shaped part with two parallel vibrating arms connected to each other by a linking part, and a central arm protruding from said linking part and located between both vibrating arms carrying at least two electrodes to make them vibrate, these two electrodes being connected respectively to at least first and second connection pads located on a back face of said central arm oriented toward the bottom of the case, said case further comprising at least one support secured to its bottom on which said central arm of the resonator is fixed by means of at least first and second connection elements located on said support and electrically connected respectively to said first and second connection pads by a conductive adhesive, wherein guiding means are provided at least with either said first connection pad or element being located on the linking part side in order to flow excess of said conductive adhesive away from the second electrode being not electrically connected to said first connection pad or element with said guiding means.

Piezoelectric resonator and assembly comprising the same enclosed in a case

The piezoelectric resonator according to the invention includes a tuning fork shaped part with two parallel vibrating arms, connected to each other by a linking part, from which protrude a central arm located between both vibrating arms of the tuning fork shaped part, wherein at least one groove is formed on at least one of a front side and a rear side of each vibrating arm.

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Grenchen, Switzerland

Thomas Luethi