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Mechanical-stress sensor and manufacturing method

A mechanical stress, sensor technology, applied in the measurement, instrument, measurement force, etc. of the property force of piezoelectric devices

Active Publication Date: 2020-12-11
ELTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Despite their wide spread, some piezoelectric sensors (particularly those used to detect shear stress) still suffer from some disadvantages, e.g. related to the way they are manufactured

Method used

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  • Mechanical-stress sensor and manufacturing method

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Embodiment Construction

[0031] Within the framework of this description, references to "an embodiment," "one embodiment," "various embodiments" and similar are intended to indicate that at least one particular configuration, structure, or feature described with respect to an embodiment is included In at least one embodiment. Thus, phrases such as "in an embodiment," "in one embodiment," "in various embodiments," and similar phrases, which may appear in various aspects of this description, do not necessarily all refer to one and the same embodiment, but rather are conversely referable to different embodiments. Furthermore, particular configurations, structures or characteristics defined in the framework of this description may be combined in any suitable manner in one or more embodiments, which may even differ from those shown. Reference numerals and spatial references (such as "top", "bottom", "upper", "lower", "front", "rear", "vertical", etc.) provided herein are particularly in reference to the d...

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Abstract

A mechanical-stress sensor comprises a piezoelectric transducer (10), which is able to generate an electrical signal representing a shear stress. The piezoelectric transducer (10) comprises: a layer of piezoelectric material (11), which extends in a longitudinal direction and has a polarization axis (A), which extends in a direction transverse to the longitudinal direction; and at least one firstelectrode (El) and one second electrode (E2), each having a plurality of fingers (Fl, F2), which extend at a first major face and a second major face, respectively, of the layer of piezoelectric material (11). The piezoelectric transducer (10) comprises at least one third electrode (E3) and one fourth electrode (E4), each having a plurality of fingers (F3, F4), which extend at the first major faceand second major face, respectively, of the layer of piezoelectric material (11), the fingers (F3) of the third electrode (E3) being interdigitated or alternating with the fingers (Fl) of the first electrode (El), and the fingers (F4) of the fourth electrode (E4) being interdigitated or alternating with the fingers (F2) of the second electrode (E2).

Description

technical field [0001] The present invention relates to mechanical stress sensors and has been studied with particular reference to piezoelectric type stress sensors and the means for manufacturing them. Background technique [0002] The use of piezoelectric stress sensors is widely known for detecting transverse (shear) stress or normal or axial (compressive) stress. For example, such sensors are used to provide acceleration sensors, pressure sensors, vibration sensors, deformation sensors, and the like. Also, the specific applications and industrial fields in which the sensors are used are very different and include the field of vehicles (e.g. for providing crash sensors or sensors for detecting engine knock), the field of consumer electronics (e.g. for providing touch input devices or devices for measuring ink consumed by printer cartridges), the medical field (for example, to provide cardiovascular sensors), the construction field (for example, to provide stress sensors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/16G01L5/167
CPCG01L1/16G01L5/167G01L1/162
Inventor M·皮齐S·阿雷拉
Owner ELTEK
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