Moving-iron type electro-acoustic/acoustic-electrical conversion device

Abstract

The invention relates to a moving-iron type electro-acoustic / acoustic-electrical conversion device. The conversion device comprises a permanent magnet part, a coil part and a vibrating diaphragm; thestructural feature is that the permanent magnet part is the plane magnet, the coil part comprises a coil substrate and a coil winding built in the coil substrate; the plane magnet and the vibrating diaphragm are connected as an integer structure; the coil substrate and the plane magnet are arranged in parallel; multiple ribs are arranged on the corresponding planes of the plane magnet and the coilsubstrate at intervals; various ribs are arranged on the surface of the plane magnet in parallel or distributed on the circumference location of the plane magnet surface at intervals. The conversiondevice has the advantages of being simple in structure, convenient for realization, small in linear distortion and high in conversion efficiency.

Description

technical field [0001] The invention relates to a moving iron type electro-acoustic / acoustic-electric conversion device. Background technique [0002] The speaker is an electro-acoustic conversion product. For a dynamic speaker, its working principle is: the coil (voice coil) of the speaker is connected to an AC audio current, and an alternating magnetic field is generated around the coil. Since the coil is located in the speaker's own In the magnetic field of the permanent magnet, therefore, the two magnetic fields generate an interaction force, causing the coil to vibrate with the amplitude of the audio current. In the speaker, the coil and the diaphragm are integrated, and the diaphragm follows the vibration of the coil to produce sound, thereby completing the electrical signal to the machine. Vibration conversion. [0003] A microphone is a sound-to-electricity conversion product. Taking a dynamic microphone as an example, its working principle is just the opposite of t...

AI Technical Summary

Problems solved by technology

However, the traditional electro-acoustic / acoustic-electric conversion mechanism has the problems of linear distortion and low conversion efficiency in specific operation. Taking the moving coil speaker as an example, the coil runs up and down the cylindrical magnet, and the magnetic field strength above and below the cylindrical magnet is uneven. Yes, only the middle part is relatively uniform, the operating range in the uniform magnetic field is small, and the signal line with large amplitude begins to leave this area, causing the magnetic field where the coil is located to gradually weaken, the Lorentz force on the coil decreases, and the force that pushes the paper cone to move The force is not proportional to the amplitude of the input audio signal, which is equivalent to compressing the amplitude of the peak, resulting in distortion

The planar speaker uses the principle of isomagnetism. It uses planar magnets in its cavity. The magnetic force lines of the planar magnets are distributed in a ring. The ring-shaped magnetic force lines are coupled with the planar coils. The interaction is poor, the efficiency is very low, and it is difficult to drive. It can only be achieved by enlarging the magnet. The method of area is solved, the increase of the magnet will increase the weight of the product, which also increases the wearing pressure

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