Piezoelectric element

A technology for piezoelectric components and piezoelectric elements, applied in electrical components, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of increasing the number of manufacturing steps of piezoelectric components and increasing the manufacturing cost of piezoelectric components And other issues

Inactive Publication Date: 2004-05-26
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the number of manufacturing steps of the piezoelectric component increases, which leads to a problem that the manufacturing cost of the piezoelectric component increases

Method used

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Examples

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Effect test

no. 1 example

[0019] (A first embodiment, Figures 1 to 5 )

[0020] figure 1 A piezoelectric component of an embodiment of a wave trap according to the invention is shown in . The piezoelectric trap 10 includes a piezoelectric element 11 , a damper member 12 , a support substrate 13 for carrying the piezoelectric element 11 , and a cover member 14 for covering the piezoelectric element 11 on the support substrate 13 .

[0021] Such as figure 2 As shown, the piezoelectric element 11 contains such as Pb(Zr,Ti)O 3 (PZT) or the like rectangular piezoelectric substrate 15, two vibrating electrodes 21a and 22a are formed on the top surface of the piezoelectric substrate 15, and two vibrating electrodes 21b and 22b are formed on the bottom surface thereof. The vibrating electrodes 21b and 22b are opposed to the vibrating electrodes 21a and 22a, respectively, and sandwich the piezoelectric substrate 15 therebetween. On the left end portion of the piezoelectric substrate 15, a terminal electr...

no. 2 example

[0027] (Second embodiment, Figures 6 to 8 )

[0028] Image 6 A piezoelectric component according to an embodiment of the present invention is shown in , which is applied to a discriminator. The piezoelectric discriminator 50 includes a piezoelectric element 51 , a damper member 52 , a cover 53 for accommodating the piezoelectric element 51 , and a cover member 54 for shielding the opening of the top surface of the cover 53 .

[0029] The piezoelectric element 51 is formed of a rectangular piezoelectric substrate 55 having a vibration electrode 61 formed on its top surface, and a vibration electrode 62 formed on its bottom surface. The vibrating electrodes 61 and 62 are formed on the central portion of the piezoelectric substrate 55 so as to face each other. The extension portion 61a of the vibrating electrode 61 extends from the top surface to the bottom surface on the left end side of the piezoelectric substrate 55 . The extension portion 62a of the vibrating electrode ...

no. 3 example

[0034] (the third embodiment, Figure 9 with 10 )

[0035] Next, the third embodiment will be described based on a piezoelectric trap of a single body, such as Figure 9 As shown, a piezoelectric trap 70 includes a piezoelectric element 71, and protective substrates 74 and 75 for sandwiching the piezoelectric element 71 therebetween to form a vibration space.

[0036]The piezoelectric element 71 includes a piezoelectric substrate 80 having vibration electrodes 81a and 82a formed on the top surface thereof. On the bottom surface of the piezoelectric substrate 80, vibration electrodes 81b and 82b are formed so as to face the vibration electrodes 81a and 82a, respectively. In the left end portion of the piezoelectric substrate 80, an extension electrode 84 is formed, which is connected to the vibrating electrode 81a. In the right end portion of the piezoelectric substrate 80, an extension electrode 85 is formed, which is connected to the vibrating electrode 82a. Between the ...

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PUM

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Abstract

A low-cost piezoelectric component which is efficiently manufactured and which provides excellent electrical characteristics, includes a piezoelectric element, a damping member, a supporting substrate for mounting the piezoelectric element, and a cover member. On a surface of the piezoelectric element, the damping member has a predetermined hardness and a vibrating electrode. In the case of a piezoelectric trap filter, a damping member is provided which has a Shore hardness of about 35 to about 80. In the case of a piezoelectric discriminator, the damping member has a Shore hardness of about 80 to about 100.

Description

technical field [0001] The present invention relates to a piezoelectric component, and more particularly, to a piezoelectric component such as a notch filter for canceling a signal having a specific frequency, and a discriminator for identifying a signal. Background technique [0002] Piezoelectric components using thickness shear vibration and thickness longitudinal vibration, such as wave traps and discriminators, generally have a structure consisting of a rectangular piezoelectric substrate with a vibrating electrode, an accommodating portion made of a cover member material such as alumina for accommodating the piezoelectric substrate, and a cover member for shielding the accommodating portion with the piezoelectric substrate therein, wherein, The piezoelectric substrate is supported in the case so that its vibrating portion vibrates. In the piezoelectric part having such a structure, since the thickness shear vibration etc. is a vibration mode having a node in the cente...

Claims

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Application Information

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IPC IPC(8): H01L41/053H03H9/09H03H9/10H03H9/15H03H9/54H03H9/56
CPCH03H9/1035H03H9/09H03H9/1014H03H9/56H03H9/15H10N30/88
Inventor 泽井久仁雄桥本久幸
Owner MURATA MFG CO LTD
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