External force measuring system and component mounting apparatus

Details External force measuring system and component mounting apparatus External force measuring system and component mounting apparatus

1995-04-20

1996-06-04

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310326, 310338, H01L 41113

Patent

active

055236421

ABSTRACT:
In an external force measuring system comprising a piezoelectric element 61 or producing a charge when acted on by an external force, and a charge amplifier 7 chargeable with a variation in the charge produced by the piezoelectric element to output a voltage signal, the charge amplifier 7 comprises a feedback loop having an on-off controllable switch 8 connected in parallel therewith. The switch 8 is on-off controlled by a comparator 81 for comparing the output voltage with a reference value and is closed while no external force acts on the element.

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