Ultrasonic actuator

An actuator, ultrasonic technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, etc., can solve the problem of hindering piezoelectric Eliminate problems such as component bending vibration and efficiency reduction, and achieve the effect of suppressing obstacles and improving efficiency

Inactive Publication Date: 2008-04-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology reduces how far it takes for an ultrasound device's movement when compared with traditional devices that have had trouble moving around smoothly without getting stuck or causing damage due to excessive pressure on certain parts during use. This improves its performance over time while also making them more reliable and durable against wear out quickly.

Problems solved by technology

This patented describes various technical features associated with small size ultrasound devices such as those used in medical applications like diagnostics and therapy. These include: (1) design considerations relating to how the device should have certain characteristics including its ability to generate high levels of sound pressure without being too big; (2) minimizing power consumption while maintaining good performance over time; (3) improving flexibility during use by reducing stress concentration caused by external forces acting upon it, resulting in improved durability and reduced wear degradation compared to previous designs. Overall, these improvements help improve their overall effectiveness and lifespan of the device.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

FIG. 1 is an exploded perspective view of an ultrasonic actuator in Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1 .

[0022] In FIGS. 1 and 2 , spherical driving parts 2 and 2 are provided at two places on the surface of a piezoelectric element 1 made of a piezoelectric material such as PZT (lead zirconate titanate) or crystal.

[0023] A power supply electrode 8 divided into four is provided on the front surface of the piezoelectric element 1 , and an integral electrode (not shown) is provided on the rear surface of the piezoelectric element 1 . Lead wires 9 are connected to the power supply electrodes 8 and the bulk electrodes with solder 6 , and the lead wires 9 are led to the outside through through holes (not shown) provided in the case 4 . When an AC voltage of a specific frequency is applied to the power supply electrode 8 and the entire electrode of the piezoelectric element 1 through the lead wire 9 , the piezoelectric element 1 ...

Embodiment 2

Next, the ultrasonic actuator according to the second embodiment of the present invention will be described.

[0039] Although in the above-mentioned first embodiment, each drive unit 2 is attached to the piezoelectric element 1 in point contact with the adhesive 10, in the ultrasonic actuator according to the second embodiment, as shown in FIG. 7, The annular body 71 is arranged around each drive unit 2 . In short, the annular body 71 is arranged around the contact point between each drive unit 2 and the piezoelectric element 1 . That is, each driving unit 2 is not only attached to the piezoelectric element 1 in a point contact state, but also attached to the piezoelectric element 1 through the annular body 71 . The annular body 71 is attached to each of the drive units 2 and the piezoelectric element 1 in line contact. Furthermore, each drive unit 2 and the annular body 71 , and the annular body 71 and the piezoelectric element 1 are attached together with the adhesive 10 ....

Embodiment 3

Next, the ultrasonic actuator according to the third embodiment of the present invention will be described.

[0043] In the above first and second embodiments, the case where a spherical shape is used as the shape of the driving portion 2 has been described, but a cylindrical driving portion can also be used. At this time, each drive unit 2 is arranged so that the axis of the cylinder substantially perpendicularly intersects the plane on which each drive unit 2 performs approximately elliptical motion (that is, the plane on which the piezoelectric element 1 performs bending vibration), and each drive unit 2 It is mounted on the surface of the piezoelectric element 1 (see FIG. 10 ). The cross-sectional view at this time is the same as that in FIG. 2 . In addition, it is preferable to fix each of the columnar driving parts 2 to the piezoelectric element 1 with the same adhesive 10 as that used for the spherical shape. In this way, each drive unit 2 is mounted on the upper surfa...

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Abstract

An ultrasonic actuator is provided with a piezoelectric element (1) which performs bending vibration and stretching vibration, and a driving element (2) which is attached by point contact on a plane facing the vibrating direction of the bending vibration in the piezoelectric element (1) and outputs driving force by operating in accordance with the vibration of the piezoelectric element (1).

Description

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Claims

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Application Information

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Owner PANASONIC CORP
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