JP4075757B2 - Speaker - Google Patents

Description

  The present invention relates to a speaker used in various audio equipment.

  Hereinafter, a conventional speaker will be described with reference to FIG.

  FIG. 3 is a cross-sectional view of a diaphragm of a conventional speaker.

  Although not shown directly in FIG. 3, this conventional speaker includes a magnetic circuit having a magnetic gap, a bobbin having a voice coil disposed in the magnetic gap as a part thereof, and an outer portion of the bobbin. A combined diaphragm 7 and a braking member 8 attached to the diaphragm 7 are provided.

  In FIG. 3, the diaphragm 7 includes a hemispherical dome portion 5 and an edge portion 6 extending from the dome portion 5 at the center thereof. Silicone rubber 9 is coated on the surface of the diaphragm 7, and a braking material 8 is attached to the back surface of the dome portion 5 of the diaphragm 7.

  A speaker having a dome portion on the diaphragm 7 as described above is generally called a dome tweeter for high-frequency range reproduction. Of the dome tweeters, those having a base made of a soft material such as cloth as the diaphragm 7 are generally called soft dome tweeters, and those having a hard material such as metal foil as a base are often called hard dome tweeters. . And this hard dome tweeter has a wide piston motion region, a clear sound quality is obtained, and is particularly excellent in the reproduction sound of a metal instrument or the like.

  However, in this hard dome tweeter, since the internal loss of the diaphragm 7 is small, it resonates violently in the divided vibration region and often generates a large peak near the high frequency limit frequency. In addition to the metal foil, the same peak may occur even in a diaphragm using a substrate such as a resin film or a hard cloth.

  Conventionally, as an improvement plan for the problem of the hard dome tweeter, there has been an attempt to attach a braking material 8 to the diaphragm 7 as shown in FIG.

For example, Patent Document 1 and Patent Document 2 are known as prior art document information related to the present invention.
JP 52-102021 A Japanese Utility Model Publication No.59-46098

  However, the conventional configuration has a problem that the performance of the speaker is lowered. That is, this is because the weight of the diaphragm 7 is increased. Conventionally, since the silicone rubber 9 has low braking performance, it has been necessary to attach the braking material 8 using a latex material to the diaphragm 7 in order to increase the braking performance. Therefore, as a result, as described above, the weight of the diaphragm 7 is increased, and the performance of the speaker is lowered.

  Therefore, an object of the present invention is to provide a speaker having reduced weight and high performance.

  And in order to achieve this objective, this invention has the following structures.

  The invention according to claim 1 of the present invention is coupled to a magnetic circuit having a magnetic gap, a bobbin having a voice coil disposed in the magnetic gap as a part thereof, and the magnetic gap outside portion of the bobbin. A speaker comprising a diaphragm and a braking material attached to the diaphragm, wherein the main component of the braking material is a reactive liquid oligomer having a JIS-A hardness of 40 ° or less.

  With this configuration, it is possible to provide a speaker with reduced weight and high performance. That is, firstly, a braking material mainly composed of a reactive liquid oligomer having a JIS-A hardness of 40 ° or less has a high braking performance, and therefore contributes to weight reduction by reducing the amount used. Further, this braking material has a heat resistance of 80 ° C. or more and is flexible with a JIS-A hardness of 40 ° or less. That is, the braking material used in the present invention has high braking performance, high heat resistance, and high flexibility. Therefore, by using this braking material, an increase in weight due to the conventional braking material can be prevented, and a high performance speaker can be provided.

  According to the second aspect of the present invention, the main component of the reactive liquid oligomer is composed of a material mainly containing a modified silicone. The modified silicone is most preferably a hydrolytic condensation type modified silicone. That is, it can be said that the hydrolysis type is optimal in consideration of the presence or absence of a bleed product, low viscosity, price, and the like and the point that it can be stored in one liquid. Thereby, an optimal material can be selected as the main component of the reactive oligomer, and it is possible to reduce the weight and provide a speaker having high performance.

  According to a third aspect of the present invention, a braking material is attached in the vicinity of the coupling portion between the diaphragm and the bobbin. This further reduces the weight of the speaker. That is, the vibration of the vibration plate in the vicinity of the coupling portion with the bobbin is most severely divided. Therefore, unnecessary resonance of the diaphragm can be effectively reduced by intensively attaching the braking material thereto. As a result, the amount of braking material can be reduced and the weight can be further reduced.

  The effect of the speaker of the present invention is to provide a speaker having reduced weight and high performance. That is, the braking material used in the present invention has high braking performance and high heat resistance. This is a feature that combines the advantages of both silicone rubber and conventional braking materials. Therefore, by using this braking material, an increase in weight can be prevented and a high performance speaker can be provided.

(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a cross-sectional view of a speaker according to Embodiment 1 of the present invention.

  In FIG. 1, the speaker of the present invention includes a magnetic circuit 2 having a magnetic gap 1, a bobbin 4 having a voice coil 3 disposed in the magnetic gap 1 in a part thereof, and the bobbin 4 outside the magnetic gap 1. A vibration plate 7 coupled to the portion; and a braking material 8 attached to the vibration plate 7. The main component of the braking material 8 is a reactive liquid oligomer having a JIS-A hardness of 40 ° or less. Features. At this time, the diaphragm 7 includes a hemispherical dome portion 5 at the center and an edge portion 6 extended from the dome portion 5. The braking material 8 is provided in a state of being thinly attached to substantially the entire lower surface of the dome portion 5.

  In the configuration as described above, it is possible to reduce the weight and provide a speaker having high performance by using the braking material 8 whose main component is a reactive liquid oligomer having a JIS-A hardness of 40 ° or less. To do. That is, the braking material 8 mainly composed of a reactive liquid oligomer having a JIS-A hardness of 40 ° or less first has a heat resistance of 80 ° C. or more. Second, the viscosity before curing is 100,000 cps or less. Thirdly, even if the conventionally used silicone rubber has a low hardness after curing, the JIS-A hardness is about 50 to 80 °, while the JIS-A hardness is 40 ° or less. That is, the braking material 8 used in the present invention has high heat resistance and low hardness, so that the braking performance is high. This is a characteristic that combines the advantages of both conventional rubber materials using silicone rubber and latex materials. Therefore, by using this braking material 8, it is possible to prevent an increase in weight and to provide a high-performance speaker.

  The main component of the material of the braking material 8 is optimally a hydrolytic condensation type modified silicone. That is, the hydrolyzed modified silicone can be said to be optimal in view of the presence or absence of a bleed product, low viscosity, price, and the like, and the point that it can be stored in one liquid. Examples of the modified silicone system include an unreacted type polypropylene oxide polymer whose main chain is modified silicone, and a hydrolytic condensation type polypropylene oxide polymer whose main chain is modified silicone.

  In addition to the modified silicone, the main component of the reactive oligomer includes urethane, hydrocarbon, and silicone. Urethanes include hydrolytic condensation type urethanes. The hydrocarbon type includes a non-reactive type / condensation reaction type polymer in the main chain, and the silicone type includes a non-reactive type and a hydrolytic condensation type. However, as described above, hydrolytic condensation type modified silicone is optimal for the main component of the material of the braking material 8.

  The reactive liquid oligomer used in the present invention is a polymer in which 90% or more of the polymer main chain is a polypropylene oxide and has a hydrolyzable silyl group or an alkenyl group necessary for a hydrosilylation reaction at the terminal. Including those in which the components are grafted into the oligomer, if necessary. Furthermore, known antioxidants, ultraviolet absorbers, polymer plasticizers, coupling agents, inorganic fillers, and the like may be blended depending on the purpose.

  In addition, as an example of the braking material 8 whose performance has been confirmed in the performance test, there is one having a modified silicone as a main component, a viscosity at room temperature of 25000 cps, and a JIS-A hardness after curing of 25 °.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  FIG. 2 is a cross-sectional view of the speaker according to Embodiment 2 of the present invention.

  2, in the speaker according to the second embodiment of the present invention, a braking material 8 is attached in a ring shape in the vicinity of the coupling portion between the diaphragm 7 and the bobbin 4. In addition, about the thing which has the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the description is simplified.

  In the above configuration, the weight of the speaker can be further reduced, and a speaker having high performance can be provided. That is, the vicinity of the coupling is divided and vibrated most severely. Therefore, unnecessary resonance of the diaphragm 7 can be effectively reduced by intensively attaching the brake material 8 here. As a result, the amount of braking material to be used can be reduced, and the weight can be further reduced and a high performance speaker can be provided.

  INDUSTRIAL APPLICABILITY The present invention has an effect of reducing the weight and providing a speaker having high performance, and is useful for a speaker used in various audio apparatuses. In other words, the braking material used in the present invention has high heat resistance and high braking performance because of its low hardness. This is a feature that combines the advantages of both silicone rubber and conventional braking materials. Therefore, the use of this braking material has the effect of preventing an increase in weight and providing a high-performance speaker. This effect is useful for speakers used in various audio devices.

Sectional drawing of the speaker in Embodiment 1 of this invention Sectional drawing of the speaker in Embodiment 2 of this invention Cross-sectional view of a conventional speaker diaphragm

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic gap 2 Magnetic circuit 3 Voice coil 4 Bobbin 5 Dome part 6 Edge part 7 Diaphragm 8 Braking material 9 Silicone rubber

Claims (3)

A magnetic circuit having a magnetic gap, a bobbin having a voice coil disposed in the magnetic gap in a part thereof, a diaphragm coupled to the outside part of the magnetic gap of the bobbin, and a brake attached to the diaphragm And a main component of the braking material is a reactive liquid oligomer having a JIS-A hardness of 40 ° or less. The speaker according to claim 1, wherein the main component of the reactive liquid oligomer is a modified silicone. The speaker according to claim 1, wherein the braking material is attached in the vicinity of a joint portion between the diaphragm and the bobbin.

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