Laminated piezoelectric element, and injection device and fuel injection system having the element
A piezoelectric element, laminated technology, applied in the direction of charging system, fuel injection device, piezoelectric/electrostrictive device manufacturing/assembly, etc., can solve the problems of piezoelectric body layer damage, component displacement reduction, etc. , to achieve the effect of inhibiting damage, reducing the concentration of stress, and inhibiting scattering
Active Publication Date: 2010-11-03
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.
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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] Such as 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 surfac...
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This aims to provide a laminated 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 laminated piezoelectric element comprises laminates including a plurality of ceramic layers and a plurality of internal electrode layers and having their internal electrode layers sandwiched between the ceramic layers disposed to face the internal electrode layers individually. The ceramic layers include piezoelectric layers and less rigid ceramic layers made less rigid than the piezoelectric layers and the internal electrode layers. The less rigid ceramic layers include a plurality of ceramic portions spaced from each other through clearances, and shielding layers for shielding the surfaces of the ceramic portions at least partially.
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): H01L41/083F02M51/06H01L41/187H01L41/22H01L41/24H01L41/273
CPCH01L41/273H01L41/0838F02M63/025F02M63/0225F02M51/0603H01L41/1876H10N30/508H10N30/053H10N30/8554
Inventor 冈村健
Owner KYOCERA CORP