JP2003153386A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of the improvement of sound pressure level and stabilization of characteristics in a speaker applied to various acoustic devices and information communicating devices. SOLUTION: In this speaker, a frame 26 and a voice coil 28 are integrated with a resin for forming a diaphragm 27. With this constitution, since an adhesion is not needed, the reduction and quantification of the weight of a vibrating system can be achieved, thereby improving the sound pressure level and stabilizing the characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various audio equipment and information communication equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to FIG. FIG. 3 is a sectional view of a conventional speaker, in which a magnetized magnet 1 is sandwiched by an upper plate 2 and a yoke 3 to form an inner magnet type magnetic circuit 4. The frame 6 was coupled to the yoke 3 of the magnetic circuit 4. The diaphragm 7 is adhered to the peripheral edge of the frame 6 with an adhesive agent, and the voice coil 8 adhesively bonded to the diaphragm 7 is connected so as to fit into the magnetic gap 5 of the magnetic circuit 4.

[0003]

In the above-mentioned speaker, since the diaphragm 7 and the voice coil 8 and the frame 6 and the diaphragm 7 are adhesively bonded by the adhesive, the weight of these adhesives reduces the sound pressure level. Inviting was a challenge.

The present invention solves the above problems and provides an excellent speaker capable of improving the sound pressure level.

[0005]

In order to solve the above problems, the present invention has the following constitution.

According to a first aspect of the present invention, the frame and the voice coil are integrated by a diaphragm structure. With this configuration, since the adhesive is not required, the weight of the vibration system can be reduced and quantified, and the effect of improving the sound pressure level and stabilizing the characteristics can be obtained.

According to the second aspect of the present invention, the diaphragm is made of ethylene propylene diene terpolymer (EP
It is composed of a microfiller-blended thermoplastic elastomer mainly composed of DM) and having a submicron diameter. With this configuration, the elastic strength of the diaphragm is improved, and the effect of preventing deformation of the diaphragm due to wind pressure, drop impact, heat, etc. can be obtained.

According to the third aspect of the present invention, the diaphragm is made of ethylene propylene diene terpolymer (EP
It is composed of a microfiller kneading rubber mainly composed of DM) and having a submicron diameter. With this configuration, the rubber elastic strength of the diaphragm is improved, wind pressure and drop impact,
It is said that a diaphragm that can prevent deformation of the diaphragm due to heat etc. and stabilize the characteristics by improving internal loss can be realized by an in-mold vulcanization molding method by an inexpensive hot press, which can reduce equipment cost and production cost. The effect is obtained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same content, the description is simplified and demonstrated.

(First Embodiment) The first embodiment of the present invention will be described below, particularly the invention described in claim 1.

FIG. 1 shows a cross-sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 shows a cross-sectional view of a main part of a component according to an embodiment of the present invention. The magnetized magnet 21 is sandwiched between the upper plate 22 and the yoke 23 to form an inner magnet type magnetic circuit 24. On the other hand, as shown in FIG. 2, the frame 26 and the voice coil 28 are integrated by the resin of the diaphragm 27 that is insert-molded to form a vibration system.

The yoke 2 of the magnetic circuit 24 shown in FIG.
3, the frame 26 having the configuration shown in FIG. 2 is coupled to the voice coil 28 so that the voice coil 28 is fitted into the magnetic gap 25 of the magnetic circuit 24.

With this configuration, the adhesive for the frame 26 and the diaphragm 27 and the adhesive for the diaphragm 27 and the voice coil 28 is unnecessary, so that the weight of the vibration system can be reduced and quantified, and the sound pressure level can be improved. You can Further, it is possible to stabilize the characteristics by eliminating the variation in the adhesive weight. Also, the frame 26
Since it is possible to reduce the respective bonding steps of the diaphragm 27 and the diaphragm 27 and the voice coil 28,
It is possible to significantly reduce costs in the production process.

(Second Embodiment) The second embodiment of the present invention will be described below, particularly the invention described in claim 2. The difference from the first embodiment is that the resin material of the diaphragm 27 is made of ethylene propylene diene terpolymer (E
It is composed of a micro-filler-kneaded thermoplastic elastomer mainly composed of PDM). With this configuration, the elastic strength of the diaphragm 27 is improved, and the diaphragm 27 is prevented from being affected by wind pressure, drop impact, heat, or the like.
Even if is deformed temporarily or instantaneously, since it has improved elastic strength, it can immediately return to its original shape.

Further, since the internal loss of the diaphragm 27 is improved, the peak and the dip are suppressed in the frequency characteristic of the speaker, and the stable frequency characteristic can be obtained. Further, this can also reduce distortion.

(Third Embodiment) The third embodiment of the present invention will be described below with reference to the present invention. The difference from the first embodiment is that the resin material of the diaphragm 27 is made of ethylene propylene diene terpolymer (E
It is composed of a micro-filler kneaded rubber having a submicron diameter mainly composed of PDM). With this configuration, the diaphragm 27 can be produced by an in-mold vulcanization molding method using an inexpensive hot press, and the equipment cost and the production cost can be significantly reduced. Further, the diaphragm 27 has improved rubber elastic strength, and even if the diaphragm 27 is temporarily or instantaneously deformed due to wind pressure, drop impact, heat, or the like, the rubber elastic strength is improved. Can return to the shape of.

Further, since the internal loss of the diaphragm 27 is made of rubber, it can be remarkably improved and a supple movement can be obtained. Therefore, peaks and dips are greatly suppressed in the frequency characteristics of the speaker, and stable frequency characteristics can be obtained. In addition, this also makes it possible to significantly reduce distortion.

[0018]

As described above, the speaker of the present invention has a vibrating system in which the frame and the voice coil are integrated by the diaphragm structure. With this configuration, since the adhesive is not required, the weight of the vibration system can be reduced and quantified, and the sound pressure level can be improved and the characteristics can be stabilized.

As described above, the present invention can provide an excellent speaker capable of improving the sound pressure level and stabilizing the characteristics, and its industrial value is very great.

[Brief description of drawings]

FIG. 1 is a sectional view of a speaker according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a speaker component according to the embodiment of the present invention.

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

[Explanation of symbols]

21 magnet 22 Upper plate 23 York 24 Magnetic circuit 25 magnetic gap 26 frames 27 diaphragm 28 voice coils

Continued front page    (72) Inventor Shinya Mizone             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5D012 CA04 CA08 CA09 CA14 FA10                 5D016 EC02

Claims (3)

[Claims] 1. A frame coupled to a magnetic circuit, a diaphragm coupled to the frame, and a voice coil coupled to the diaphragm and partially disposed in a magnetic gap of the magnetic circuit. A speaker in which the frame and the voice coil are integrated by a structure forming a diaphragm. 2. The speaker according to claim 1, wherein the diaphragm is made of a microfiller-kneaded thermoplastic elastomer having a submicron diameter and mainly composed of ethylene propylene diene terpolymer (EPDM). 3. The speaker according to claim 1, wherein the diaphragm is made of a micro-filler kneaded rubber having a submicron diameter and mainly composed of ethylene propylene diene terpolymer (EPDM).