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Elastic wave device

An elastic wave device and elastic wave technology, applied in impedance networks, electrical components, electrical solid devices, etc., can solve the deformation of the protective cover 46, the deterioration of the electrical characteristics of the surface acoustic wave device, the contact of the protective cover and the large deformation of the vibration space, etc. problem, to achieve the effect of improving moisture resistance

Active Publication Date: 2010-08-11
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in such as Figure 4 In the conventional surface acoustic wave device shown, the protection cover 46 may be greatly deformed due to the high pressure during transfer molding.
When the protective cover 46 is greatly deformed, the contact between the protective cover 46 and the IDT electrodes and the large deformation of the vibration space will occur, thereby causing a problem that the electrical characteristics of the surface acoustic wave device will be greatly deteriorated.

Method used

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  • Elastic wave device
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Embodiment Construction

[0035] Hereinafter, embodiments of the elastic wave device of the present invention will be described in detail using the drawings.

[0036] In addition, the acoustic wave device according to the present invention will be described centering on a surface acoustic wave device having an IDT electrode having at least one comb-shaped electrode composed of a plurality of electrode fingers.

[0037] The surface acoustic wave device of this embodiment is such as figure 1 (a), figure 1 (b) and Figure 5 As shown, it is mainly composed of the following: a piezoelectric substrate 1, which propagates surface acoustic waves; an IDT electrode 2 as an excitation electrode, which is formed on the first main surface of the piezoelectric substrate 1; 1 main surface, used to electrically connect the IDT electrode 2 and the external circuit; a columnar external connection electrode 10, which is formed on the end of the connecting wire 3; a protective cover 17, which has a hollow accommodatio...

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Abstract

Provided is a highly reliable elastic wave device wherein deterioration of electrical characteristics due to deformation of a protection cover is suppressed. A method for manufacturing such elastic wave device is also provided. The elastic wave device is provided with a piezoelectric substrate (1) for propagating an elastic wave; an excitation electrode arranged on a first main surface of the piezoelectric substrate (1); a columnar electrode (10) for connecting to the external, which is electrically connected to the excitation electrode; a protection cover (17), which has a hollow storing space (8) for storing the excitation electrode and is arranged on the first main surface; and a conductor layer (18), which is arranged on the protection cover (17) and is connected to the electrode (10).

Description

technical field [0001] The present invention relates to elastic wave devices mainly used in wireless communication circuits of mobile communication equipment and the like. Background technique [0002] In recent years, portable terminal devices used for mobile communications have been reduced in size and weight, and built-in circuits have increased in order to realize multi-band support for multiple communication systems and multi-function and high-performance portable terminal devices. Therefore, in order to increase the mounting density of electronic components, it is strongly desired that the electronic components used be small components that can be surface-mounted. [0003] As a key component of the portable terminal device, there is an elastic wave device. As an elastic wave device, there is a surface acoustic wave device in which excitation electrodes are formed on a piezoelectric substrate, and a piezoelectric thin film resonator in which a piezoelectric thin film i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/25H03H3/08
CPCH03H9/1092H03H9/105H03H9/059H03H9/1085H01L2924/181H01L2224/16225H01L2924/00012
Inventor 深野彻大久保佳洋西井润弥
Owner KYOCERA CORP
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