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Speaker

A loudspeaker and piezoelectric vibration technology, applied in the direction of sensors, sensor types, piezoelectric/electrostrictive transducers, etc., can solve the problem of piezoelectric vibration plate bending, no longer play speakers, piezoelectric vibration plate amplitude limit, etc. problem, to achieve the effect of reproducing the sound pressure

Active Publication Date: 2013-12-25
PANASONIC INTPROP MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the reproduced sound pressure increases, the piezoelectric diaphragm bends significantly
Therefore, when the reproduced sound pressure is increased, the stress generated in the piezoelectric diaphragm may exceed the breaking stress of the piezoelectric element and cracks may occur in the piezoelectric element.
and, in such a case, no longer function as a loudspeaker
Therefore, the amplitude of the piezoelectric diaphragm is actually limited, and there is a problem that the reproduced sound pressure cannot be sufficiently improved.

Method used

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Effect test

Embodiment approach 1

[0045] The piezoelectric speaker according to Embodiment 1 of the present invention includes two piezoelectric diaphragms having different rigidities, a connecting member connecting the two piezoelectric diaphragms, and a piezoelectric speaker on the sound emission surface side. In the case of the upper side of the speaker, the frame supports the central portion of the piezoelectric diaphragm located on the lower side. In addition, by using a more rigid vibration plate for the piezoelectric vibration plate having a larger maximum value of the bending stress acting at the amplitude of the two piezoelectric vibration plates, the vibration of each piezoelectric vibration plate at a large amplitude is controlled. attitude, so that the maximum value of the stress can be reduced, and the maximum sound pressure that can be reproduced can be increased.

[0046] figure 1 is a front view of the piezoelectric speaker 10 according to Embodiment 1 ( figure 1 (a)) and rear view ( figu...

Embodiment approach 2

[0066] The piezoelectric speaker 20 according to Embodiment 2 includes two piezoelectric diaphragms having different rigidities, a connecting member connecting the two piezoelectric diaphragms, and a structure for supporting the piezoelectric diaphragm on the lower side (back side). end frame. In addition, by using a vibration plate with a higher rigidity for the piezoelectric vibration plate having a larger maximum value of the bending stress acting on vibration among the two piezoelectric vibration plates, the vibration of each piezoelectric vibration plate at a large amplitude is controlled. The vibration posture can reduce the maximum value of stress and increase the maximum sound pressure that can be reproduced.

[0067] Figure 6 It is a sectional view of the piezoelectric speaker 20 according to the second embodiment.

[0068] Such as Figure 6 As shown, piezoelectric speaker 20 includes upper piezoelectric diaphragm 21 (front side diaphragm), lower piezoelectric dia...

Embodiment approach 3

[0081] The piezoelectric speakers 30 and 40 according to Embodiment 3 are different from the above-described embodiments in that they have three piezoelectric diaphragms. Figure 8A It is a sectional view of the piezoelectric speaker 30 according to the third embodiment. Figure 8B is related to Embodiment 3 and Figure 8A Cross-sectional views of piezoelectric speakers 40 in different forms.

[0082] Piezoelectric speaker 30 such as Figure 8A As shown, three piezoelectric vibration plates 31 , 32 , and 33 , a plurality of connection members 37 a , 37 b , and 38 , an edge 34 , an upper frame 35 , and a lower frame 36 are provided. Each of the piezoelectric vibrating plates 31 , 32 , and 33 is a vibrating plate having a bimorph structure. In each piezoelectric vibrating plate 31 , 32 , 33 , piezoelectric elements 31 b , 31 c , 32 b , 32 c , 33 b , 33 c are bonded to both surfaces of base materials 31 a , 32 a , 33 a , respectively. In addition, from the front side of the s...

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PUM

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Abstract

A speaker (10) comprises the following: a plurality of piezoelectric vibration boards (11, 12) having a base board and piezoelectric elements disposed on at least one surface of the base board; one or a plurality of connecting members (13) that connect the plurality of piezoelectric vibration boards (11, 12) so that the plurality of piezoelectric vibration boards (11, 12) are lined up from the piezoelectric vibration board (11) closest to the front of a speaker (10) in the thickness direction of the piezoelectric vibration board (11) and so that the adjacent piezoelectric vibration boards (11, 12) face one another with a gap therebetween; and a support member (16) that supports the back side piezoelectric vibration board (12), which is the piezoelectric vibration board closest to the back of the speaker (10). The plurality of piezoelectric vibration boards (11, 12) include two piezoelectric vibration boards (11, 12) with mutually differing rigidity.

Description

technical field [0001] The present invention relates to piezoelectric speakers using piezoelectric elements. Background technique [0002] Piezoelectric speakers, unlike dynamic speakers, do not require a magnetic circuit as a drive system, so they have the advantage of being easy to reduce in thickness. On the other hand, when the same voltage is input, there is a disadvantage that the amplitude of the diaphragm is smaller and the reproduced sound pressure is lower than that of the dynamic speaker. Furthermore, most conventional piezoelectric speakers are used for middle and high frequency reproduction because their surroundings are fixed, and it is difficult to perform low frequency reproduction. [0003] Therefore, in order to increase the reproduced sound pressure and reproduce to a low frequency band, a method of connecting a plurality of piezoelectric diaphragms in the vibration direction has been proposed (for example, refer to Patent Document 1). Figure 13 This is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/00
CPCH04R17/00H04R7/06H04R17/04
Inventor 狩野佐和子松村俊之
Owner PANASONIC INTPROP MANAGEMENT CO LTD
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