Piezoelectric transformer, power supply circuit and lighting unit using the same

A technology of piezoelectric transducers and piezoelectric ceramics, applied in lighting devices, components of piezoelectric devices or electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problem of electrical connection structures Complicated, difficult electrical connections, etc.

Inactive Publication Date: 2004-12-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the known piezoelectric transducer utilizing the radially expanding vibration mode of the piezoelectric ceramic disc 10, since the high impedance portion 12 provided at the central portion of the piezoelectric transducer 10 has such Figure 27A The stacked structure shown, so the electrical connection becomes difficult, thus disadvantageously complicating the electrical connection structure

Method used

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  • Piezoelectric transformer, power supply circuit and lighting unit using the same
  • Piezoelectric transformer, power supply circuit and lighting unit using the same
  • Piezoelectric transformer, power supply circuit and lighting unit using the same

Examples

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Effect test

no. 1 example

[0050] figure 1 is a perspective view of a piezoelectric transducer 50A of the first embodiment of the present invention, figure 2 is a top plan view of the piezoelectric transducer 50A. Figure 3A and 3B are along figure 2 The sectional view taken along the lines IIIA-IIIA and IIIB-IIIB. As shown in these figures, the piezoelectric transducer 50A includes a piezoelectric ceramic disk 21 whose one side and the other side are opposed to each other in the thickness direction. A pair of low-impedance portions 22 serving as a power generation portion or a driving portion are provided in the piezoelectric ceramic disk 21 symmetrically with respect to the central axis of the piezoelectric ceramic disk 21 . In addition, a pair of high impedance portions 23 serving as a driving portion or a power generation portion are provided on the piezoelectric ceramic disk 21 symmetrically about the central axis of the piezoelectric ceramic disk 21 and electrically separated from the low i...

no. 2 example

[0073] Figure 11A and 11B These are a top plan view and a bottom plan view of a piezoelectric transducer 50B of the second embodiment of the present invention, respectively. Figure 12 is along Figure 11A Sectional view taken along line XII-XII. piezoelectric transducer 50B with Figure 8 The piezoelectric transducer 50A" is different in the following points. That is, as shown in FIGS. An electrode 25a and the third electrode 24a are used to contact the support member 35, and a circular area 27b is also arranged on the other side of the piezoelectric ceramic disc 21, and the second electrode 25b and the fourth electrode are not formed in this area. 24b for contacting with another support member 35 .

[0074] Figure 13B A piezoelectric transformer of a comparative example of the piezoelectric transformer 50B is shown. in such as Figure 13B As shown, when the common electrode 26 is formed on the entire other surface of the piezoelectric ceramic disk 21 in the same ma...

no. 3 example

[0079] Figure 14 A top plan view of a piezoelectric transducer 50C according to a third embodiment of the present invention. Figure 15A , 15B and 15C are respectively along Figure 14 The cross-sectional views taken by the XVA-XVA line, XVB-XVB line and XVC-XVC line in Such as Figure 15B As shown, a plurality of electrode layers 29 and piezoelectric layers 30 are alternately stacked in the thickness direction of each low impedance portion 22 . Each electrode layer 29 is located at each opposing portion exposed on one side wall surface of each piezoelectric layer 30 so as to be connected to a side electrode 31 a formed on one side wall surface of each piezoelectric layer 30 . at the same time as Figure 15C As shown, the remaining electrode layers 29 are exposed to the other wall surface of each piezoelectric layer 30 to be connected to the side electrode 31b formed on the other side wall surface of each piezoelectric layer 30 .

[0080] Such as Figure 14 Shown in and...

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PUM

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Abstract

A piezoelectric transformer includes a piezoelectric ceramic disc having one face and the other face opposite to each other in a thickness direction. A pair of low-impedance portions acting as one of a driving portion and a generator portion are disposed in the piezoelectric ceramic disc symmetrically with respect to a central axis of the piezoelectric ceramic disc, while a pair of high-impedance portions acting as the other of the driving portion and the generator portion are disposed in the piezoelectric ceramic disc symmetrically with respect to the central axis so as to be electrically separated from the low-impedance portions such that the piezoelectric transformer is driven in a radial extensional vibration mode of the piezoelectric ceramic disc.

Description

technical field [0001] Field of the Invention The present invention relates generally to piezoelectric transducers and, more particularly, to an improved piezoelectric transducer which is made compact and capable of producing a large output. The present invention also relates to a power supply circuit using the piezoelectric transformer, and an illuminating device using the piezoelectric transformer. Background technique [0002] Since the power density per unit volume of the piezoelectric transducer is larger than that of the electromagnetic transducer, the piezoelectric transducer can be made small and thin. In addition, in the piezoelectric converter, since power conversion is performed by exciting mechanical resonance vibrations based on the inverse piezoelectric effect, a high conversion efficiency is obtained. Therefore, in recent years, piezoelectric transformers are used to switch power sources to miniaturize power supply circuits of electronic devices. [0003] F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/04H01L41/107H05B41/282
CPCH01L41/044H05B41/2822H01L41/107H10N30/804H10N30/40
Inventor 武田克中塚宏
Owner PANASONIC CORP
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