Piezoelectric plane horn

Abstract

The invention discloses a piezoelectric plane horn, comprising a framework, a piezoelectric actuator, and a vibration generating membrane arranged in the transparent assembling space of the framework, wherein two opposite sides of the vibration generating membrane are fixed to the piezoelectric actuator, with the other two sides thereof forming a spacing relationship with the framework; the piezoelectric actuator formed by utilizing a bimodal piezoelectric piece is fixed at two sides of the vibration generating membrane; the vibration generating membrane is made to generate the voice of high pitch voltage via the high deformation of a bimodal piezoelectric piece; the bimodal piezoelectric piece in the piezoelectric actuator can be independently driven by the drive circuit to cooperate with the phase control of different bimodal piezoelectric piece drive voltage, thus to adjust the vibration movement of the vibration generating membrane and reduce the resonance phenomenon of the vibration generating membrane, thereby making the vibration generating membrane produce relatively flat acoustic frequency response. The piezoelectric plane horn is applicable to sound equipment, TV, computer, and other electronic devices and is located in a preset installing space of the electronic device by utilizing the framework thereof.

Description

technical field [0001] The present invention relates to a piezoelectric planar speaker; in particular, to a piezoelectric actuator composed of a plurality of dual-mode piezoelectric sheets, which are fixed on a frame to drive a vibration-generating diaphragm to produce sound, and then through the dual-mode The polarity of the driving voltage of the state piezoelectric film is adjusted to vibrate and the diaphragm resonance phenomenon occurs, so that it can produce sound with both wide range and high sound pressure, and achieve the innovative design of the best planar speaker product application. Background technique [0002] Press, the vibration of the object to produce audio is the basis of sound generation. The speaker generally includes two parts: an actuator that is energized to generate vibration and a vibration generating diaphragm that drives air to vibrate and output sound. With the development trend of thinner and lighter electronic products, speakers are gradually ...

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Problems solved by technology

[0006] Another example is that patents JP2001285994 and US2010158283 disclose the use of vibration-absorbing damping materials (dampers) to suppress the larger amplitude generated by resonance and reduce the resonance phenomenon of the vibration-generating diaphragm to achieve the effect of widening the overall sound range. However, it is similar to many The design of the layer structure still has the problem of high complexity

Another example is that patents JP2279000, JP3139999, US5828768, JP3589873, and JP2003102094 disclose that the electronic product has an existing cavity, and the piezoelectric actuator is directly combined with the container wall, and the sound box function through the cavity is used to compensate for the lack of bandwidth. However, due to the thick wall of the container, the vibration amplitude generated by it is limited, so the output sound pressure is relatively low

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