Structural units of moving coil speakers
The headphone speaker speaker is also called the driver. It is also habitually called the moving coil speaker, which is the same as the sound principle of the electric speaker. Its design requirements must meet the needs of small caliber and light weight. Otherwise, it cannot be installed to the ear shell.
It needs to be light without compromising performance. NdFeB has become the preferred magnet material. It has a very high magnetic density, which can reach 7-14 times that of ferrite. An ordinary earphone NdFeB magnet can easily Absorbs objects dozens of times their own weight.
Most earphones are not a crossover design, it is actually a full-band speaker that needs to be responsible for a very wide frequency response, which is not an easy task. To achieve full-band sound from a single diaphragm, the diaphragm needs to be extremely thin, light, and strong, and almost all of the diaphragms used in speakers are unqualified. The diaphragms used in moving coil loudspeakers are mostly made of very thin PVC material, and the thinnest thickness can reach several microns. In order to enhance the strength of the diaphragm, the diaphragm is generally suppressed with reinforcing lines, which can improve the high-frequency response and produce vibrational separation. certain deterrent effect.
The voice coil is also the key, because the diaphragm must be very light and thin, and the self-weight of the voice coil will also affect the working state of the diaphragm. The copper voice coil is heavier, so more CCAW voice coils are used. Clad Aluminum Wire, Chinese is aluminum clad copper wire, it effectively reduces the self-weight of the voice coil. This kind of voice coil is also used in speakers for speakers, but the scope of application is relatively small.
