Electric speaker using mems mic as driving circuit and sound control method

Abstract

The present invention relates to an electric horn using a mems mic as a driving circuit and a sound control method. At present, conventional electric horns use a 555 timer or IC to generate a frequency signal to drive a MOS tube to generate an induced electromotive force to make the horn sound. The manufacturing cost is high, the volume is large, and the reliability is low. The present invention comprises: a diaphragm (12), the diaphragm is pressed and fixed to the outer stop of a housing seat (2) through a gland (11), a coil frame (3) is provided between the diaphragm and the housing seat, the coil frame is fixed to the inner bottom of the housing seat, a controller (5) and a terminal (4) are respectively installed on the side surface of the coil frame, the terminal is connected to the wiring harness on the vehicle, a connecting stud (13) is fixed to the lower center of the housing seat, the external thread of the connecting stud passes through the housing seat and is fixed to the vehicle body steel frame, and a horn housing (1) is fixed to the upper part of the housing seat. The present invention is used as an electric horn for motor vehicles.

Description

Technical field:

[0002] The invention relates to an electric horn for a motor vehicle, in particular to an electric horn using a mems mic as a driving circuit and a sound control method thereof. Background technology:

[0004] Currently, electric speakers are all in the traditional dynamic, capacitive or piezoelectric types, using a 555 timer or IC to generate a frequency signal, driving the MOS tube to generate an induced electromotive force to make the speaker sound. Its structure is relatively complex, large in size, poor in stability, low in reliability, and high in manufacturing cost. Summary of the invention:

[0006] The purpose of the present invention is to provide an electric speaker using a mems mic as a driving circuit and a sound control method thereof, which has good stability, simple structure and small size.

[0007] The above purpose is achieved through the following technical solutions:

[0008] An electric horn using a mems mic as a driving circuit comprises: a diaphragm, the diaphragm is fixed by a gland and an outer stopper of a housing seat, a coil frame is provided between the diaphragm and the housing seat, the coil frame is fixed to the inner bottom of the housing seat, a controller and a terminal are respectively installed on the side surface of the coil frame, the terminal is connected to a wiring harness on a vehicle, a connecting stud is fixed to the lower center of the housing seat, the external thread of the connecting stud passes through the housing seat and is fixed to the vehicle body steel frame, and a horn shell is fixed to the upper part of the housing seat.

[0009] The electric horn using mems mic as a driving circuit, the controller includes: an integrated circuit board, the integrated circuit board has a mems mic module, an amplifier circuit, and a driving circuit, and the controller is connected to the coil skeleton, diaphragm, terminal, and switch button through wires.

[0010] The electric speaker and sound control method using mems mic as a driving circuit are described. The mems mic is a micro-electromechanical microphone, and its pressure-sensitive membrane is directly etched on a silicon chip using micro-electromechanical technology. On this basis, an amplifier and a signal feedback processing circuit are integrated. When the switch button is closed during operation, the mems mic generates a pulse signal to drive the circuit. The driving circuit generates an induced electromotive force to excite the diaphragm to vibrate and make a sound. Then, the mems mic pressure-sensitive membrane receives the sound signal fed back from the diaphragm after the sound is made and converts it into a voltage signal. After signal processing, the circuit is driven again, and the speaker coil is driven to continue to excite the diaphragm to vibrate and make a sound. In this way, a closed-loop circuit is formed, which continuously makes the diaphragm vibrate and make a sound, and the operation stops when the switch is opened.

[0011] Beneficial effects of the present invention:

[0012] 1. When the present invention is working, the mems mic generates a pulse signal to drive the circuit, and generates an induced electromotive force to make the diaphragm vibrate and make sound. Then, after the sound signal is fed back and processed, the circuit is driven to oscillate the diaphragm again to make sound, and the cycle is repeated. After the mems mic is packaged, the electric speaker has good high-temperature stability and reflux stability, reduces power consumption, and improves sensitivity and adaptability.

[0013] The present invention completely changes the original production process by applying MEMS MIC micro-electromechanical technology. Its processing technology is non-mechanical. It adopts integrated circuit batch processing micro-manufacturing technology, has a simple structure, a small size, is easy to install, is compatible with digitalization, has strong anti-interference ability, good stability, a high degree of automation, is suitable for large-scale production, reduces costs, and is very convenient to use and replace, thereby improving work efficiency and expanding the market's new product updates and usage rates. Description of the drawings:

[0015] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0016] Attached Figure 2 It is a control circuit schematic diagram of the present invention. Specific implementation method:

[0018] Embodiment 1:

[0019] An electric horn using a mems mic as a driving circuit comprises: a diaphragm 12, the diaphragm is fixed to the outer stop of a housing seat 2 by a gland 11, a coil skeleton 3 is provided between the diaphragm and the housing seat, the coil skeleton is fixed to the inner bottom of the housing seat, a controller 5 and a terminal 4 are respectively installed on the side surface of the coil skeleton, the terminal is connected to the wiring harness on the vehicle, a connecting stud 13 is fixed to the lower center of the housing seat, the external thread of the connecting stud passes through the housing seat and is fixed to the vehicle body steel frame, and a horn housing 1 is fixed to the upper part of the housing seat.

[0020] Embodiment 2:

[0021] According to the electric horn using a mems mic as a driving circuit as described in Example 1, the controller includes: an integrated circuit board 10, the integrated circuit board has a mems mic module 7, an amplifier circuit 8, and a driving circuit 9, and the controller is connected to the coil skeleton, diaphragm, terminal, and switch button 6 through wires.

[0022] Embodiment 3:

[0023] According to the electric speaker and sound control method using a mems mic as a driving circuit as described in Example 1 or 2, the mems mic is a micro-electromechanical microphone, and its pressure-sensitive membrane is directly etched on a silicon chip using micro-electromechanical technology, and an amplifier and a signal feedback processing circuit are integrated on this basis. First, when the switch button is closed during operation, the mems mic generates a pulse signal to drive the circuit, and the driving circuit generates an induced electromotive force to excite the diaphragm to vibrate and make a sound. Then, the mems mic pressure-sensitive membrane receives the sound signal fed back from the diaphragm after the sound is made and converts it into a voltage signal. After signal processing, the circuit is driven again, and the speaker coil is driven to continue to excite the diaphragm to vibrate and make a sound, thus forming a closed-loop circuit, which continuously makes the diaphragm vibrate and make a sound, and the operation stops when the switch is opened.

Claims

1. A method for controlling the sound of an electric horn using a mems mic as a driving circuit, characterized in that: The steps include the following: the MEMS mic is a micro-electromechanical microphone, whose pressure-sensitive membrane is directly etched on a silicon chip using micro-electromechanical technology, and on this basis, an amplifier and a signal feedback processing circuit are integrated. First, when the switch button is closed during operation, the MEMS microphone generates a pulse signal to drive the circuit, and the driving circuit generates an induced electromotive force to excite the diaphragm to vibrate and make a sound. Then, the MEMS microphone pressure-sensitive membrane receives the sound signal fed back from the diaphragm after the sound is made and converts it into a voltage signal. After signal processing, the circuit is driven again, and the speaker coil is driven to continue to excite the diaphragm to vibrate and make a sound, thus forming a closed-loop circuit, which continuously makes the diaphragm vibrate and make a sound. When the switch is turned on, the operation stops. Among them, the electric horn using mems mic as a driving circuit comprises: a diaphragm, the diaphragm is pressed and fixed with the outer stop of the housing seat through a gland, a coil frame is provided between the diaphragm and the housing seat, the coil frame is fixed to the inner bottom of the housing seat, a controller and a terminal are respectively installed on the side surface of the coil frame, the terminal is connected to the wiring harness on the vehicle, a connecting stud is fixed at the lower center of the housing seat, the external thread of the connecting stud penetrates the housing seat and is fixed to the vehicle body steel frame, and a horn shell is fixed on the upper part of the housing seat; The controller comprises an integrated circuit board, which has a mems mic module, an amplifier circuit and a drive circuit. The controller is connected to the coil frame, the diaphragm, the terminal and the switch button through a wire.

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