(1) The frame of the earphone speaker
It is the mother body for installing vibration parts, magnetic circuits,s, and other parts.
The bracket can be divided into steel plates and plastic according to the material. The steel plate is made of SPCC, and the thickness of the steel plate is 0.3~1.2MM. The surface is usually treated with multicolored electroplating and electric black to prevent rust. The plastic material is mostly ABS or ABS with fiber to increase heat resistance and strength, PBT, and so on.
(2) Washers of earphone speakers
In the magnetic circuit, the washer and the U iron both play the role of magnetism. They can concentrate the N pole and S pole of the magnet to the gap through the loop, so that the gap generates a strong magnetic field, and the volume of the voice coil is just at The gap is in the middle, so the inner diameter and thickness of the iron sheet are very important. The material of the washer is SPCC, and the surface is generally multicolored electroplated or galvanized.
(3) U cup, T iron
U iron, T iron, plays a magnetic role in the magnetic gas adding circuit. U iron should actually be called a yoke, in English Yoke, according to its shape can be divided into two types of U-shaped yoke and T-shaped.
The voice coil in the earphone speaker can be said to be the heart of the speaker and one of the important components of the speaker. After the voice coil conducts electricity, within the magnetic field, Fleming’s left-hand rule produces movement, which drives the vibrating plate. The main material is copper wire, which is first covered with an insulating layer and then coated with a layer of glue.
This glue is an alcohol resurrected glue. When the wire is dipped in alcohol, it will regain its viscosity, so that the copper wire will stick together to form a coil. Basically, the nature of this glue is similar to the material coated on the paper tube. As with paper tubes, the requirements for different temperatures and the coating of the glue are different, especially when high power will generate high heat, and the glue is even more stringent. In order to reduce the weight of the voice coil, there are wires whose inner part is made of aluminum wire and then covered with a copper layer, and then insulated and glued.