Planar coil diaphragm loudspeaker and application thereof

Abstract

The invention discloses a planar coil diaphragm loudspeaker, which comprises an outer shell, wherein a membrane assembly, a magnet assembly and a supporting assembly are packaged in the outer shell; the membrane assembly at least comprises a coil, the two ends of the coil are each provided with an end point, one end point is located in the coil, and the other end point is located outside the coil;the number of the supporting assemblies is at least one; the supporting assemblies are used for supporting the membrane assembly; the surfaces, making contact with the membrane assembly, of the supporting assemblies are provided with bonding pads connected with end points located outside the coil; and the supporting assemblies are further provided with bonding pads for audio current input and bonding pads for audio current output. Compared with the prior art, the planar coil diaphragm loudspeaker has the advantages that the problem of how to effectively connect the internal end point of the closed coil with the outside is solved, the integrity of the membrane is not damaged, the area of the membrane is utilized to the maximum extent, damage to the film caused by spot welding or conductiveadhesive bonding after perforation is avoided, and damage to the integrity of the film is further avoided.

Description

technical field [0001] The invention relates to a planar coil diaphragm loudspeaker and its application, belonging to the technical field of electroacoustics. Background technique [0002] Loudspeaker, commonly known as "horn", is an electroacoustic transducer and is widely used in speakers, earphones, mobile phones, wearable devices, robots, home appliances and other devices or facilities that need to emit sound. Current speakers include dynamic speakers, electrostatic speakers and planar coil diaphragm speakers in terms of working principles. [0003] The dynamic speaker is the most widely used speaker because of its simple structure, mature technology and good performance. However, the disadvantage of the dynamic speaker is that the transient characteristics are not good due to the large vibration mass such as the coil; The uniformity and the asymmetry of the BL electromagnetic driving force lead to different degrees of rocking vibration; because only the coil and the bo...

AI Technical Summary

Problems solved by technology

But the disadvantage is: because the driving force is inversely proportional to the square of the distance from the film to the pole plate, the electrostatic force F=ε*S*(U 2 / d 2 ), εdielectric constant, S film area, signal voltage between U film and plate, d is the distance between film and plate, electrostatic force is proportional to the square of the signal voltage, and proportional to the square of the distance from the film to the plate Inversely proportional, so the low-frequency sound is insufficient; the alternating audio signal must be boosted to several hundred volts to produce a sound acceptable to consumers. The boost process of broadband, low distortion, and high boost ratio greatly increases the cost of the product, which is why it is used The reason why the speakers and earphones of electrostatic speakers cost tens of thousands of yuan, or hundreds of thousands of yuan

[0017] To sum up, the existing technical solutions of planar coil speakers, whether it is a helical coil solution or a serpentine coil solution, the coil must be a closed curve, or a curve, or a helix connected in series from the end to the end. A closed line group always has a "starting end" and a "termination end"; and because the coil is usually a conductor, any two coils cannot be connected, which causes one of the two ends to be inside the closed coil, and the other end The point is outside the closed coil; the terminal located outside the closed coil is very easy to connect with the external circuit, such as a PCB pad, but how to export the terminal located inside the closed coil and connect it with the external circuit faces great challenges

From the above analysis, the current spot welding scheme, the scheme of perforating the middle of the membrane and connecting the coil ends on the upper and lower surfaces of the membrane through conductive glue, and the scheme of coil wires in a serpentine shape all have their own shortcomings.

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