The electro-acoustic conversion efficiency of electric paper tray speakers is very low, generally not exceeding 20%, that is to say, most of the electric power it bears becomes heat. The temperature rise of the voice coil will increase the impedance of the voice coil. Make it mismatch with the whole machine. Therefore, the key issue is to greatly increase the speaker's withstand power and improve the heat dissipation of the voice coil. A so-called magnetic fluid speaker can better solve this problem. Magnetic fluid speaker and traditional The structure of the electrodynamic speaker is almost the same. The main difference is that the magnetic fluid speaker adds a certain amount of magnetic liquid in the magnetic gap. Because the magnetic induction in the magnetic gap is very strong, even when the voice coil vibrates, the magnetic liquid is also It can be firmly absorbed in the magnetic slit. Magnetic fluid is a glue containing fine iron powder with an average diameter of 0.001 microns. These iron powders are suspended in the glue. In order to prevent the iron powder from sticking together, People also covered the surface of iron particles with a thin polymer film.

Since the voice coil is always in liquid when it is working, the heat generated by the voice coil is directly transferred to the glue liquid, and then transferred from the liquid to the magnetic circuit system. Therefore, the heat dissipation of the magnetic fluid speaker is significantly improved, and its rated power is also With a substantial improvement, the presence of the magnetic fluid also enhances the damping performance of the speaker, thereby effectively reducing the height of the resonance peak on the frequency characteristic curve and making the characteristic curve smoother.