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speaker

A technology of a loudspeaker and a loudspeaker device, applied in the field of loudspeakers, can solve problems such as increasing the installation area, and achieve the effect of good frequency characteristics

Active Publication Date: 2018-10-12
江苏波速传感器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since two amplifiers are required to drive the dynamic speaker and the piezoelectric speaker respectively, the actual installation area will be further increased

Method used

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Embodiment 1

[0017] Such as figure 1 As shown, the loudspeaker 1 involved in the present invention includes an electrodynamic speaker device 2, a piezoelectric speaker device 3, and a current amplifier that simultaneously drives the electrodynamic speaker device 2 and the piezoelectric speaker device 3 4. A piezoelectric element 31 is attached to the metal plate of the piezoelectric speaker device 3 .

[0018] figure 2 A graph showing the impedance relationship between the dynamic speaker device 2 and the piezoelectric element 31 according to the present invention is shown. Among them, the horizontal axis represents the frequency of the sound output by the speaker, and the vertical axis represents the impedance. Both frequency and impedance have a logarithmic (log scale) relationship, respectively. The rated impedance Zd of the dynamic speaker device 2 is 16Ω or 32Ω. exist figure 2 Among them, 16Ω is represented by a solid line, and 32Ω is represented by a dotted line. Because in ...

Embodiment 2

[0025] The loudspeaker 1 involved in this embodiment is composed as follows: the dynamic loudspeaker device 2 adopts a circular vibrating plate made of PET (polyethylene terephthalate) with a thickness of 6 μm and a diameter of 10 mm. The nominal impedance Zd of the device 2 is 32Ω. The piezoelectric speaker device 3 uses a five-layer stack of piezoelectric elements 31 made of lead zirconate titanate (PZT), which is mounted on a circular vibrating plate with a diameter of 10 mm made of stainless steel (SUS304) superior. The capacitance of the piezoelectric element 31 is 150 μF. The crossover frequency is approximately 33kHz (refer to figure 2 ).

[0026] Figure 4 (A) is a graph showing frequency characteristics and distortion rates of the electrodynamic speaker device 2 according to the present invention. It can be seen from the figure that when the frequency is above 10 Hz, the treble and midrange sound pressure of the electric speaker device 2 decreases, and when the ...

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Abstract

The invention provides a loudspeaker. The loudspeaker comprises an electric loud-speaking device, a piezoelectric loud-speaking device and a current amplifier, wherein a piezoelectric element is arranged in the piezoelectric loud-speaking device; the current amplifier is connected with the electric loud-speaking device and the piezoelectric loud-speaking device respectively; the current amplifier is used for driving the electric loud-speaking device and the piezoelectric loud-speaking device at the same time; omega represents a frequency of a sound output by the loudspeaker; Zd represents rated impedance of the electric loud-speaking device; Zp(omega) represents impedance of the piezoelectric element in the piezoelectric loud-speaking device; and when Zd=Zp(omega), the value of omega is 20-50 kHz. The loudspeaker has the advantages of small size and high sound quality.

Description

technical field [0001] The invention relates to the field of electroacoustics, in particular to a loudspeaker. Background technique [0002] There are two types of well-known speakers used for earphones and the like: an electrodynamic speaker and a piezoelectric speaker. Among them, an electrodynamic speaker requires a current amplifier in order to drive a voice coil with a current. As for the piezoelectric speaker, since the displacement of the piezoelectric element is proportional to the voltage, a voltage amplifier is required for driving. Therefore, it is not easy to use both types of amplifiers, especially for small devices such as headphones. [0003] Although it is also possible to drive the piezoelectric element with a current, there is a problem that the impedance of the piezoelectric element varies depending on the frequency. Therefore, even if the same current is supplied, the voltage applied to the piezoelectric element will change due to the dependence of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R9/06H04R9/02
CPCH04R9/02H04R9/06H04R2209/00
Inventor 高峰
Owner 江苏波速传感器有限公司