Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Piezoelectric actuator

A technology of actuators and piezoelectric elements, applied in the directions of electrical components, piezoelectric devices/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problem that the displacement characteristics of piezoelectric actuators cannot be fully solved. , large fluctuations, fluctuations and other issues

Inactive Publication Date: 2007-08-15
DENSO CORP
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the fluctuation amplitude of the displacement within the operating temperature range is larger than that of the above-mentioned constant voltage driving method and the above-mentioned constant energy driving method.
[0020] However, fluctuations in the displacement characteristics of piezoelectric actuators, etc. due to temperature changes cannot be adequately resolved in these prior technologies either.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piezoelectric actuator
  • Piezoelectric actuator
  • Piezoelectric actuator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0270] Next, examples of the present invention will be described.

[0271] In this example, a piezoelectric element including piezoelectric ceramics was produced, and a piezoelectric actuator was produced using this piezoelectric element.

[0272] In this example, as a model of the piezoelectric actuator, a piezoelectric actuator 11 using a jig 8 is fabricated as shown in FIG. 37 .

[0273] That is, the piezoelectric actuator 11 of this example has a multilayer piezoelectric element 2 using piezoelectric ceramics as a driving source, and the piezoelectric element 2 is fixed by a jig 8 .

[0274]The jig 8 has a housing 81 for accommodating the piezoelectric element 2 , and a piston (connecting member) 82 connected to the piezoelectric element 2 and transmitting the displacement of the piezoelectric element 2 . Piston 82 is connected to guide 83 via disk spring 85 . A base portion 815 is provided inside the housing 81 , and the piezoelectric element 2 is arranged on the base p...

Embodiment 2

[0326] Except that the calcining temperature of the sheet-shaped molded body after degreasing is set to 1105°C, follow the same steps as in Example 1 to produce 0.07 (K 0.45 Na 0.55 ) 0.93}{Nb 0.82 Ta 0.10 Sb 0.08}O 3 Composition of crystal-oriented ceramics. With regard to the obtained crystal-oriented ceramics, the sintered body density, average orientation degree, and piezoelectric properties were evaluated under the same conditions as in Example 1. In addition, a laminated actuator of 40 piezoelectric elements was manufactured in the same procedure as in Example 1, and the characteristics of the actuator were evaluated.

[0327] The relative density of the crystal-oriented ceramics obtained in this embodiment is above 95%. In addition, the pseudo-cubic {100} planes are oriented parallel to the tape planes, and the average degree of orientation of the pseudo-cubic {100} planes measured by the Lautergelding method is 94.6%. Also, as a result of the evaluation of the...

Embodiment 3

[0342] Except that the calcining temperature of the sheet-shaped molded body after degreasing is set to 1105°C, follow the same steps as in Example 1 to produce 0.065 (K 0.45 Na 0.55 ) 0.935}{Nb 0.83 Ta 0.09 Sb 0.08}O 3 Composition of crystal-oriented ceramics. With regard to the obtained crystal-oriented ceramics, the sintered body density, average orientation degree, and piezoelectric properties were evaluated under the same conditions as in Example 1. In addition, a laminated actuator of 40 piezoelectric elements was produced in the same procedure as in Example 1, and the characteristics of the actuator were evaluated.

[0343] The relative density of the crystal-oriented ceramics obtained in this embodiment is above 95%. In addition, the pseudo-cubic {100} planes were oriented parallel to the tape planes, and the average degree of orientation of the pseudo-cubic {100} planes measured by the Lautergelding method was 93.9%. In addition, as a result of the evaluation...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Curie temperatureaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

A piezoelectric actuator (1) comprising a piezoelectric element (2) having a pair of electrodes formed on the surface of a piezoelectric ceramic as a drive source. The piezoelectric actuator (1) satisfies at least one of following requirements (a) to (c). (a) Variation width WC of apparent dynamic capacitance C (F) due to temperature variation falls within +-11% in a specific temperature range of -30 to 80 DEG C. (b) Variation width WL of displacement L (mum) due to temperature variation falls within +-14% in a specific temperature range of -30 to 80 DEG C. (c) Variation width WL / C of L / C due to temperature variation falls within +-12% in a specific temperature range of -30 to 80 DEG C, assuming that the apparent dynamic capacitance is C (F) and the displacement is L (mum).

Description

technical field [0001] The present invention relates to laminated actuators, piezoelectric transformers, ultrasonic motors, bimorph piezoelectric elements, ultrasonic sonar, piezoelectric ultrasonic vibrators, piezoelectric Piezoelectric actuators for buzzers, piezoelectric speakers, etc. Background technique [0002] Piezoelectric actuators using piezoelectric ceramic materials are products that convert electrical energy into mechanical energy by using the displacement caused by the reverse piezoelectric effect, and are widely used in the fields of electronics and electromechanics. [0003] Pb(Zr·Ti)O 3 system (hereinafter referred to as "PZT system"), BaTiO 3 Wait. PZT-based piezoelectric ceramics have higher piezoelectric characteristics than other piezoelectric ceramics, and account for most of the piezoelectric ceramics that have been put into practical use. However, since lead oxide (PbO) with a high vapor pressure is contained, there is a problem that the load on ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01L41/09H01L41/187H01L41/24H01L41/22C04B35/00H02N2/00
Inventor 长屋年厚野野山龙彦中村雅也斋藤康善高尾尚史本间隆彦鹰取一雅
Owner DENSO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com