Hence, all earbuds use magnets. Magnets are used for other things besides the drivers though. There is the magnetic earpiece which is mostly used on movie sets. And, there is the Bluetooth earbud with short wires which use magnets to prevent tangling. The music you are listening to, the movies you are watching are only audio signals for your earbuds. They need to be converted into sound waves that your ear can listen to.
How do earbuds convert audio signals into sound waves? The answer is magnets. Think of it like this: earbud drivers convert electrical energy into magnetic waves. The audio signals travel through a diaphragm. For the signals to become waves, the diaphragm needs to vibrate. That is possible only by a permanent magnetic field that pulls and pushes the diaphragm.
There are other types of dynamic drivers but they also use magnets. The planar magnetic, and balanced armature drivers. Like in movies where lines are read to the actor through the earbud. We can make earbuds like this with magnets. These are the earbuds that are really small and are attached closely to the eardrum. I think most of you are familiar with earbuds like this. Magnets were the way to get rid of tangled wires before the fully wireless earbud was available.
Some earbuds are wireless but still use wires for connecting the earbuds with each other. This kind of earbuds has a magnet along the wires. To understand the answer to this question we have to talk about why some think that magnetic earbuds are dangerous.
But the same can be said for the opposite argument. This driver unit is very similar to the dynamic driver unit, but there are few differences on the magnets used. The planar magnetic driver uses extremely thin magnetic conductors which are like tiny wires and are spread out across the diaphragm.
There are not moving electromagnetic coils as the dynamic driver units use. Some people refer to these headphones as Orthodynamic drivers and they are designed to produce quality sound. With the use of an array of magnets behind the diaphragm, instead of one single permanent magnet, the driver can better react to the electrical current passing through. Just like the previously mentioned driver unit, as the current passes through the polarity changes and the diaphragm interacts causing vibrations and producing sound.
Though this is one of the least likely used driver units, the electrostatic driver units are in some of the most well-made headphones built today. There is one key difference between these electrostatic driver units and the other two previously mentioned. This style of driver unit does not use magnets to move the diaphragm but instead allows the diaphragm to move itself. The diaphragm is designed using a thin sheet of electrically charge material that sits between two conductive plates.
Of these plates, one is positively charged, and one is negatively charged. As the electrical charges pass through the two plates, the electrically charged diaphragm film will move back and forth, vibrating the air and causing sounds.
Comparatively, electrostatic driver unit headphones are usually more expensive than dynamic or planar magnetic headphones. However, many feel that these are the best headphones on the market today and the sounds produced from this diaphragm are clearer. Of course, the only way to truly find out which headphone style you love the most is to try them yourself. Different headphones will have different magnets housed inside, depending on their price point and the type of headphones you purchase.
As previously mentioned, many feel that electrostatic driver unit style headphones are the best on the market today and produce better quality sound. Equally as important are the magnets found inside of the driver units, as they can impact the quality of the sound and how it is produced. When choosing which headphones you want to purchase, you will want to look at the type of magnet used in the device. Different types have their own benefits and some commonly used magnets that you will find in headphones are Ferrite, Aluminum, and Samarium Cobalt.
However, the magnet most people believe is the best on the market and often comes in the highest quality headphones is Neodymium magnets. Neodymium magnets pack more magnetic energy in each ounce compared to others, which allows them to produce a higher sensitivity and more ample sound output while using less power. So how do we achieve such a magnetic structure?
Well, it takes one strong central ring-shaped magnet and a few pole pieces to extend the poles of the central magnet. A cross-sectional diagram is provided below:. So the main magnet in red is shaped like a ring or a thick washer. It has its south pole facing upward and north pole underneath.
A thicker ring-shaped pole piece is used to extend this south pole and provide the boundary just to the outside of the moving-coil. A disc-shaped pole piece is laid underneath the central magnet to extend the north pole. The north pole is furth extended with a cylindrical pole piece the reaches upward and provides the boundary to the inside of the moving-coil.
The idea is to get the opposite poles as close to the coil as possible with the north pole to the interior and the south pole to the exterior. This causes the greatest number of magnetic flux lines through the coil and, therefore, the greatest amount of coil movement. When an audio signal is sent to the headphones, an alternating current the audio signal passes through the coil and causes the coil to produce a magnetic field.
Because the coil is suspended in such a strong magnetic field already, this current causes the coil to move. The audio signal causes forward and backward motion due to its alternating nature. This results in the coil moving in accordance with the audio signal.
0コメント