Laminated piezoelectric element, and injection device and fuel injection system having the element
A piezoelectric element, layered technology, applied in charging systems, fuel injection devices, electrical components, etc., can solve problems such as piezoelectric layer damage and component displacement reduction, and achieve damage suppression and stress reduction. Concentrated, high-durability effect
Active Publication Date: 2013-06-19
KYOCERA CORP
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Problems solved by technology
In addition, due to such fragments of ceramics, there is a possibility that the piezoelectric body layer is damaged and the amount of displacement of the element decreases.
Method used
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[0027] Hereinafter, the multi-layer piezoelectric element of the present invention will be described in detail using the drawings. figure 1 It is a perspective view showing a multi-layer piezoelectric element according to an embodiment of the present invention. figure 2 Yes figure 1 The multi-layer piezoelectric element shown is a cross-sectional view parallel to the stacking direction. image 3 Yes figure 1 The stacked piezoelectric element shown is a cross-sectional view perpendicular to the stacking direction and including low-rigidity ceramic layers.
[0028] like Figure 1 ~ Figure 3 As shown, the multilayer piezoelectric element 1 of this embodiment (hereinafter also simply referred to as the element 1) has a plurality of ceramic layers 3 and a plurality of internal electrode layers 5, and the internal electrode layers 5 are respectively sandwiched between opposing ceramic layers. a laminated body 7 of layer 3 ; and external electrodes 9 formed on the side surfaces ...
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Abstract
This aims to provide a multi-layer piezoelectric element, which is made excellent in durability and suppressed in the reduction of a displacement degree, even if the element is largely displaced or driven at a high speed, and an injection device and a fuel injection system using the element. The multi-layer piezoelectric element comprises a stacked body comprising a plurality of ceramic layers and a plurality of internal electrode layers, each of the plurality of internal electrode layers being sandwiched between ceramic layers of the plurality of ceramic layers that are located opposite to each other. The plurality of ceramic layers comprises a plurality of piezoelectric layers, and a low-rigidity ceramic layer which has a rigidity lower than that of the plurality of piezoelectric layers and that of the plurality of internal electrode layers. The low-rigidity ceramic layer comprises a plurality of ceramic portions which are apart from each other via a void , and a covering layer which covers at least a part of an outer surface of the plurality of ceramic portions.
Description
technical field [0001] The present invention relates to a laminated piezoelectric element used, for example, in a drive element (piezoelectric actuator), a sensor element, and a circuit element. Examples of driving elements include fuel injection devices for automobile engines, liquid injection devices such as ink ejectors, precision positioning devices such as optical devices, and vibration prevention devices. Examples of sensor elements include combustion pressure sensors, knock sensors, acceleration sensors, load sensors, ultrasonic sensors, pressure sensitive sensors, and yaw rate sensors. In addition, examples of circuit elements include piezoelectric gyro, piezoelectric switch, piezoelectric transformer, and piezoelectric actuator. Background technique [0002] Conventionally, multi-layer piezoelectric elements have been sought to be able to secure a large amount of displacement under a large pressure while progressing in miniaturization. Therefore, it is desired to ...
Claims
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IPC IPC(8): H01L41/083H01L41/273F02M51/06
CPCH01L41/273H01L41/0838F02M63/025F02M63/0225F02M51/0603H01L41/1876H10N30/508H10N30/053H10N30/8554
Inventor 冈村健
Owner KYOCERA CORP