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Piezoelectric power generating apparatus

A piezoelectric power generation and piezoelectric element technology, which is applied in the directions of generators/motors, piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric effect/electrostrictive or magnetostrictive motors, etc. Space, occupation, etc.

Active Publication Date: 2014-01-01
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a plurality of power generating elements 201 to 203 are arranged in parallel, a large space is occupied, and the power generating device cannot be miniaturized.

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment ）

[0040] Figure 1 ~ Figure 3 A first embodiment of the piezoelectric generator according to the present invention is shown. The piezoelectric generator A of the present embodiment includes a box-shaped case 1 having four side wall portions 11 to 14 and a bottom wall portion 15, and is formed by the side wall portions 11 to 14 and the bottom wall portion 15. interior space16. Among the four side wall parts 11 to 14 of the casing 1 , the first and second side wall parts 11 and 12 of the two opposing side wall parts are the first fixing part and the second fixing part, respectively. In addition, a cover (not shown) is attached to the upper surface of the housing 1, and the inside of the housing 1 is sealed. The casing 1 is a fixing member in the present invention, and the side wall portion 11 and the side wall portion 12 are the first and second fixing parts in the present invention, respectively.

[0041] One end (fixed end) 2a of the first piezoelectric element 2 is fixed to ...

no. 2 Embodiment ）

[0051] Figure 9 A second embodiment of the piezoelectric generator according to the present invention is shown. In the piezoelectric power generator B of this embodiment, the same reference numerals are assigned to the same parts as those of the first embodiment, and redundant descriptions will be omitted. Figure 9 (a) is with image 3 (a) A sectional view of the corresponding part, Figure 9 (b) is with image 3 (b) Cross-sectional view of the corresponding part. In this embodiment, a convex portion 3c is formed on the upper surface of the central portion of the first spindle 3, and stepped portions 3d, 3e that are one step lower are formed on both sides of the convex portion 3c. The convex part 3c of the first spindle 3 is fixed to the lower surface of the free end 2b of the first piezoelectric element 2, and the stepped parts 3d and 3e are arranged below the fixed end 4a side of the first piezoelectric element 4. On the other hand, convex portions 5b, 5c are formed o...

no. 3 Embodiment ）

[0054] Figure 10 , Figure 11A third embodiment of the piezoelectric generator according to the present invention is shown. In the piezoelectric power generator C of the present embodiment, the same reference numerals are assigned to the same parts as those of the first embodiment, and redundant descriptions will be omitted. This embodiment differs from the first embodiment in that the first piezoelectric element is constituted by a pair of elements 2 and 2 . These first piezoelectric elements 2 , 2 are positioned between a pair of second piezoelectric elements 4 , 4 . The first spindle 3 is fixed to the free ends of the first piezoelectric elements 2, 2 so as to connect the free ends of the first piezoelectric elements 2, 2, and the widthwise end portions 3a, 3b of the first spindle 3 are The non-contact system is located below the fixed end side of the second piezoelectric elements 4 , 4 . The second spindle 5 is fixed to the free ends of the second piezoelectric elemen...

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Abstract

Provided is a piezoelectric power generator that has an overall compact size and in which a plurality of piezoelectric elements having a low natural frequency of vibration and that generate a large amount of power can be arranged in a compact manner. A piezoelectric power generator A includes a first piezoelectric element 2 and a second piezoelectric element 4, which each have a cantilever structure, fixed to the top of two opposing side walls 11 and 12 of a housing 1. The first piezoelectric element 2 and the second piezoelectric element 4 are arranged so as to oppose each other in an alternating manner and respectively have a first weight 3 and a second weight 5 joined to free ends thereof. Unused spaces formed below the fixed end sides of the piezoelectric elements 2 and 4 are used as spaces in which the weights 3 and 5 can move by positioning one of the weights under the fixed end side of the other of the piezoelectric elements.

Description

technical field [0001] The present invention relates to a piezoelectric power generating device that generates power using the piezoelectric effect, and more particularly, to a piezoelectric power generating device that uses a power generating element of a cantilever (cantilever beam) structure. Background technique [0002] like Figure 17 As shown, Patent Document 1 discloses a piezoelectric power generator having a cantilever structure in which one end of a power generating element 100 is fixed to a fixing member 101 and a spindle 102 is attached to the other free end. The power generating element 100 is an element in which piezoelectric elements 104 and 105 are pasted on both sides of a metal plate 103. When the piezoelectric element 100 is viewed from above, it has an isosceles triangle shape whose width gradually narrows from the fixed end to the free end. In this case, the bending stress applied to the piezoelectric element 100 can be equalized in the longitudinal dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
CPCH02N2/186H01L41/1136H02N2/188H10N30/306
Inventor 堀口睦弘坂口仁志
Owner MURATA MFG CO LTD
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