Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reissue Patent
2005-01-06
2011-11-15
Dougherty, Thomas M (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S318000, C310S332000, C310S351000, C310S352000, C073S504140
Reissue Patent
active
RE042916
ABSTRACT:
An angular rate sensor system [10] comprising a vibratory sensing element [12] and signal processing circuit [14]. The element [12] is preferably a polymorphic rectangular bar fabricated from two layers of piezoceramic material [26, 28] divided by a thin center electrode [Ec], and a plurality of electrodes [E1-E4] scored onto the planar conductive surfaces [30, 32]. The element [12] is suspended at its acoustic nodes [N, N′] to vibrate in one direction [V] normal to the physical plane of the electrodes [Ec, E1-E4] using any suitable mounting structure such as parallel crossed filaments [34] or inwardly angled support arms [64] that provide predetermined degrees of lateral [S′] and longitudinal [S] stiffness. The circuit [14] may optionally constitute totally shared [FIG.7], partially shared [FIG.8], or totally isolated [FIG.9] driving and sensing functions, the corresponding element [12] being configured with dual-pair, single-pair, or single-triple outer electrodes [E1-E4], respectively. The circuit [14] typically utilizes an automatic gain control and two operational amplifiers, and may include various signal conditioning components and a separate tuning module.
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Sumio Sugawara, Masas
Dougherty Thomas M
Patterson Thuente Christensen Pedersen , P.A.
Watson Industries Inc.
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