Piezoelectric material, piezoelectric element, and electronic equipment
US-2015368161-A1 · Dec 24, 2015 · US
Piezoelectric drive element and piezoelectric drive unit
US9147828B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9147828-B2 |
| Application number | US-201213876455-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 18, 2012 |
| Priority date | May 25, 2011 |
| Publication date | Sep 29, 2015 |
| Grant date | Sep 29, 2015 |
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Abstract
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A piezoelectrically actuated element includes a composite ceramic to which an alternating electric field is applied through external electrodes that are orthogonal to the polarization direction, wherein the composite ceramic is formed from a first piezoelectric ceramic having soft spring characteristics such that the elastic constant decreases with increasing vibration velocity, and a second piezoelectric ceramic having hard spring characteristics such that the elastic constant increases with increasing vibration velocity. Even when the applied electric field is intensified to increase the vibration velocity of the piezoelectrically actuated element, the overall change in the elastic constant is minimized, and fluctuations in the resonance frequency is suppressed.
First claim
Opening claim text (preview).
What is claimed is: 1. A piezoelectric drive element, comprising: a composite ceramic that combines a first piezoelectric ceramic having spring characteristics such that its elastic constant decreases as a vibration speed increases, with a second piezoelectric ceramic having spring characteristics such that its elastic constant increases as a vibration speed increases; and external electrodes provided on side faces of the complex ceramics in a manner facing each other across the…
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Inventors
Classifications
- H01L41/083Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H10N30/50Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9147828B2 cover?
- A piezoelectrically actuated element includes a composite ceramic to which an alternating electric field is applied through external electrodes that are orthogonal to the polarization direction, wherein the composite ceramic is formed from a first piezoelectric ceramic having soft spring characteristics such that the elastic constant decreases with increasing vibration velocity, and a second pi…
- Who is the assignee on this patent?
- Doshida Yutaka, Taiyo Yuden Kk
- What technology area does this patent fall under?
- Primary CPC classification H01L41/083. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 29 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).