KR20050079267A - Diaphragm for speaker - Google Patents

Abstract

The present invention discloses a diaphragm for a speaker. The diaphragm for a speaker according to the present invention is made by mixing a filler with TPX having physical properties superior to those of conventionally used polypropylene. Therefore, the physical properties of the diaphragm are improved to improve the sound quality of the speaker.

Description

Diaphragm for Speaker {DIAPHRAGM FOR SPEAKER}

The present invention relates to a speaker having improved sound quality by improving the diaphragm.

The speaker has a magnetic circuit portion and a vibration portion that generates sound by working with the magnetic circuit portion. The vibration unit has a voice coil which vibrates up and down by vibrating up and down when the current is applied from the outside, and a vibration plate generating vibration while vibrating by the voice coil.

In order for the speaker to reproduce good sound, the specific gravity of the diaphragm must be low, and the elastic modulus, internal loss, heat resistance, and rigidity must be large. Among the physical properties of the diaphragm, the specific gravity affects the mass of the diaphragm. If the specific gravity is low, the diaphragm is lighter and can be driven with less energy, thereby increasing the driving efficiency of the diaphragm. The internal loss absorbs the excitation of the diaphragm after the diaphragm is vibrated. If the inner loss is large, the diaphragm is vibrated by a certain signal, and then the vibration is prevented from overlapping when the diaphragm is vibrated by another signal. . In addition, since a lot of heat is generated inside the speaker while the speaker is operating, the heat resistance of the diaphragm should be large. In addition, when the rigidity of the diaphragm is large, the linearity of the vibration is improved in the speaker, thereby widening the low frequency band.

The diaphragm of the conventional speaker is made of paper having the above properties or polypropylene (PP) to which a filler is added. As the filler, Mica, Talc, Glass Fiber, etc. are used. When the filler is added to the polypropylene (PP), the specific gravity of the polypropylene is increased, and the modulus of elasticity and internal loss are It becomes small, and heat resistance and rigidity become large.

However, the conventional diaphragm using paper as a main material has a disadvantage that its surface is rough and unsightly. In addition, the diaphragm mainly made of the polypropylene to which the filler is added has a disadvantage in that the specific gravity of the polypropylene is increased by the filler, so that the elastic modulus is decreased, and the internal loss is reduced, so that the sound quality of the diaphragm is reduced.

The present invention was created to solve the problems of the prior art as described above, an object of the present invention is to provide a speaker that improves the sound quality by improving the material of the diaphragm.

Speaker diaphragm according to an embodiment of the present invention for achieving the above object is characterized in that made of synthetic resin mixed with TPX (PMP: Poly 4-methyl-1-pentene) and filler.

Hereinafter, a diaphragm for a speaker according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The speaker of the present invention has a frame, a magnetic circuit portion coupled to the outside of the frame, and a vibration portion provided inside the frame. The magnetic circuit portion has a yoke in which an edge portion is coupled to the center portion of the frame, a circular magnet and a pole piece which are sequentially stacked in the yoke. The vibrating unit is fixed to the frame and the outer circumferential surface is vibrated up and down to generate a sound vibration plate and the upper end side is fixed to the inner circumferential surface of the diaphragm and the lower end is located between the yoke and the pole piece when the current is applied from the outside It has a voice coil for vibrating the diaphragm while vibrating up and down by working with a circuit part.

In order for the speaker to reproduce good sound, the specific gravity of the diaphragm must be low, and the elastic modulus, internal loss, heat resistance, and rigidity must be large. The specific gravity of the diaphragm affects the mass of the diaphragm. When the specific gravity is low, the weight of the diaphragm is lighter and can be driven with small energy, thereby increasing driving efficiency of the diaphragm. As the stiffness increases, the linearity of the vibration is improved in the speaker, thereby widening the low frequency band. The internal loss absorbs the excitation of the diaphragm after the diaphragm is vibrated. If the inner loss is large, the diaphragm is vibrated by a certain signal, and then the vibration is prevented from overlapping when the diaphragm is vibrated by another signal. . Since a lot of heat is generated inside the speaker while the speaker is operating, the diaphragm is also required to have heat resistance.

The diaphragm for the speaker of the present invention is made by adding a filler to TPX (PMP: Poly 4-methyl-1-pentene). The physical properties of the TPX are superior to those of the conventional polypropylene, which will be described in detail with reference to Table 1. Specific gravity is 0.84 of the TPX, 0.9 of the polypropylene, and elasticity of the TPX is 4.25. The polypropylene is 3.39 The internal loss of the TPX is 0.0521, the polypropylene is 0.0310, the heat deflection temperature at 1.8Mpa is TPX is 100 ㅀ C the polypropylene is 54 ㅀ C. In addition, the propagation speed increases as the elastic modulus increases. The propagation speed of the TPX is 2725 m / sec and the propagation speed of the polypropylene is 2288 m / sec. That is, the specific gravity of the TPX is lower than the specific gravity of the polypropylene, and the elastic modulus, internal loss, heat deformation temperature, and propagation speed are larger than the elastic modulus, internal loss, heat deformation temperature, and propagation speed of the polypropylene.

TABLE 1

On the other hand, in order to increase the elastic modulus, internal loss, heat resistance and rigidity of the TPX, a plate-shaped inorganic filler or a needle-like organic / inorganic filler is added. Nickel (Mica), talc (Talc) and glass (Glass), etc. are used as the plate-shaped inorganic fillers, and glass fibers, ARAMID fibers, and CARBON fibers are used as the needle-like organic / inorganic fillers. do. In this case, any one selected from the nickel (Mica), talc (Talc) and glass (Glass), or any one selected from the glass fiber, aramid (ARAMID) and carbon (CARBON) fiber is added to the TPX. And, TPX: the filler = 100% by weight: 1 to 30% by weight is mixed.

As described above, the diaphragm for a speaker according to the present invention is made by mixing a filler with TPX having physical properties superior to those of conventional polypropylene. Therefore, the physical properties of the diaphragm are improved to improve the sound quality of the speaker.

In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims (4)

 In the diaphragm for a speaker, The diaphragm is a diaphragm for a speaker, characterized in that made of TPX (PMP: Poly 4-methyl-1-pentene) and a synthetic resin mixed with a filler. The method of claim 1, The filler is a diaphragm for a speaker, characterized in that any one selected from nickel, talc and glass. The method of claim 1, The filler is a diaphragm for a speaker, characterized in that any one selected from glass fibers, aramid (ARAMID) fibers and carbon (CARBON) fibers. The method according to any one of claims 1 to 3, Wherein TPX: the filler = 100% by weight: diaphragm for the skier, characterized in that 1 to 30% by weight.