Electroacoustic converter

A technology of electroacoustic converters and converters, applied in piezoelectric/electrostrictive transducers, resonant transducers, circuits, piezoelectric devices/electrostrictive devices, etc., can solve problems such as temperature rise and local loss , to achieve the effect of reducing the internal loss

Inactive Publication Date: 2003-07-16
BRANSON ULTRASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This harmonic motion produces idle work and causes local losses and temperature rise

Method used

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  • Electroacoustic converter
  • Electroacoustic converter
  • Electroacoustic converter

Examples

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Embodiment Construction

[0039] The electroacoustic transducer 1 of the present invention is generally shown in FIGS. 2 and 3 . The converter 1 converts electrical energy into mechanical vibration of a predetermined frequency. It is circular in cross-section and includes a longitudinal or vertical axis VA.

[0040] The converter 1 comprises a metal front driver body 3, a metal rear driver body 5, a front ceramic stack 7, a rear ceramic stack 9 and a spacer 11 arranged between the front and rear ceramic stacks. Fixture 13 (similar to bolt B in Fig. 1) passes axially through rear drive body 5, ceramic stacks 7 and 9 and extends to front drive body 3 to clamp spacers between front and rear ceramic stacks 3 and 5 11. As shown in Figure 2, the ceramic stacks 7 and 9 are substantially symmetrical about the shim 11, and the ceramic stack / shim assembly is substantially symmetrical about the transverse axis LA. Each ceramic stack has two ceramic sheets W. The number of sheets in the front and rear ceramic st...

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PUM

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Abstract

An electroacoustic converter (1) is disclosed for converting electrical energy into mechanical vibrations at a predetermined frequency. The converter (1) is supplied with alternating electrical power from the power supply. The converter has metal front and rear driver masses (3, 5), front and back ceramic stacks (7, 9), a spacer (11) between the front and back ceramic stacks, and a fastener extending axially of the converter coupling the front and back driver masses to clamp the ceramic stacks and the spacer between the front and back drivers. The front and back ceramic stacks are of piezoelectric ceramic material such that when energized with an alternating electrical power from the power supply the piezoelectric material renders the converter resonant at the predetermined frequency. The spacer, and front and back driver masses are provided with fins to radiate heat from the converter. The converter exhibits substantially even temperatures and a vibrational node within the spacer.

Description

technical field [0001] The invention relates to electroacoustic transducers and transducers, such as for use in ultrasonic devices, such as ultrasonic welders for welding plastic or other materials. More specifically, the present invention relates to improvements in the construction of clamped transducers, or transducers, using a plurality of piezoceramic discs clamped between two masses. Background technique [0002] A typical half-wavelength electroacoustic transducer is disclosed in commonly assigned US Patent 5,590,866 and is shown in FIG. 1 . This prior art electroacoustic transducer C has a stack of piezoceramic sheets W clamped between front and rear metal drive bodies FM and BM. The piezoelectric material may be a lead zirconate titanate material, and is often referred to as a ceramic material. The piezoceramic sheets used in such transducers have a hole in their center and may be plated on their diametrical end faces with a conductive material such as silver to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/10B06B1/06H01L41/09H01L41/187
CPCB06B1/0618
Inventor 阿兰·J·罗伯茨詹姆斯·F·西汉
Owner BRANSON ULTRASONIC CORP
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