What is the role of the speakers in electro-acoustic devices?
Our most common electric cone speaker. Electric cone-shaped speakers are often used as paper cone speakers in the past. Although the diaphragm is still dominated by paper cones in 2014, many polymer material diaphragms and metal diaphragms have appeared at the same time.
Actually. Conical speakers are mainly composed of magnetic circuit system (permanent magnet, core column, magnetic guide plate), vibration system (paper cone, voice coil) and support auxiliary system (centering piece, basin frame, cushion) partial composition.
1. Voice coil: The voice coil is the driving unit of the cone speaker. It is wound on the paper tube in two layers with a very thin copper wire. It is usually wound around several tens of turns, also called a coil, placed on the magnetic core column. The magnetic shielding plate formed by the magnetic conductive plate. The voice coil is fixed with the paper cone. When the sound current signal enters the voice coil, the voice coil vibration drives the paper cone to vibrate.
2. Paper cones: There are many types of materials used for the cone diaphragm of cone speakers. There are two types of natural fibers and man-made fibers. Natural fibers are usually made of cotton, wood, wool, silk, etc., and rayon is made of rayon, nylon, glass fiber, and the like. Since the paper cone is the sound radiating device of the speaker, the sounding performance of the speaker is determined to a considerable extent. Therefore, no matter which kind of paper cone is required, it is required to be light in weight and good in rigidity, and cannot be deformed due to changes in ambient temperature and humidity.
3. Folding ring: The folding ring is set to ensure the axial movement of the paper cone along the speaker and to limit the lateral movement. At the same time, it acts to block the front and back of the paper cone. In addition to the material of the paper cone, the material of the folding ring is also bonded to the paper cone by heat pressing using plastic, natural rubber or the like.
4. Centering piece: The centering piece is used to support the joint of the voice coil and the paper cone to ensure that it is vertical and not skewed. There are many concentric rings on the centering piece, so that the voice coil can freely move up and down in the magnetic gap without lateral movement, ensuring that the voice coil does not touch the magnetic plate. The dust cover on the centering piece is to prevent the external dust from falling into the magnetic gap, avoiding the friction between the dust and the voice coil, and causing the speaker to produce an abnormal sound.
This article is from ALLICDATA ELECTRONICS LIMITED.