A mobile phone with piezoelectric bone conduction receiver

Abstract

A piezoelectric bone conduction receiver and a portable electronic device are disclosed. The piezoelectric bone conduction receiver comprises: a piezoelectric bone conduction receiver driving unit functioning as an acoustic vibration element, a piezoelectric driving and signal processing circuit connected with the piezoelectric bone conduction receiver driving unit, and a driving signal switching module, wherein the piezoelectric bone conduction receiver driving unit comprises at least two piezoelectric bone conduction receiver driving modules which can be independently driven in operation, the at least two piezoelectric bone conduction receiver driving modules are connected to the driving signal switching module which is connected with the piezoelectric driving and signal processing circuit, and the driving signal switching module is configured to control phases of piezoelectric driving signals output by the piezoelectric driving and signal processing circuit to the piezoelectric bone conduction receiver driving modules, so that the phases of the piezoelectric driving signals received by the piezoelectric bone conduction receiver driving modules are same or opposite.

Description

technical field [0001] The invention relates to a receiver, in particular to a piezoelectric bone conduction receiver and a portable electronic device. Background technique [0002] With the popularity of smart phones, the screens of current mobile phones are getting bigger and bigger, and the phones are getting thinner and thinner. Due to the complex structure of the traditional dynamic receiver (that is, earpiece), it is difficult to realize miniaturization and thinning. Moreover, since the working principle of the traditional dynamic receiver is that the diaphragm pushes the air to vibrate to produce sound, openings for air conduction must be reserved in the application structure design, which destroys the appearance of the entire device and is prone to the hidden danger of dust or moisture entering the device . [0003] The local sound pressure of the air-conducted receiver is usually about 90-100dB when it is working. In a quieter surrounding environment (such as a ge...

AI Technical Summary

Problems solved by technology

[0011] The piezoelectric bone conduction device proposed by the patent CN1627864A has high impedance and high input voltage, and the resonance frequency is high, so that the reproduction of the low frequency region is insufficient; in addition, due to the high mechanical quality factor of the vibration system, the generation of vibration at a specific frequency strengthened or weakened

Thus, sound reproduction cannot be performed naturally and normally

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