JP2788998B2 - Laminated materials for vibration parts and speaker vibration parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laminated material suitable for a component constituting a vibration system of a speaker such as a diaphragm and an edge, and a speaker vibration system component using the laminated material. About.

[Prior Art] Conventionally, a soft dome diaphragm, an edge supporting the diaphragm, and a dust cap stuck to the front center of a cone-shaped diaphragm to prevent intrusion of dust and the like are made of cotton impregnated with a shaping material. A material sheet in which a material having a large internal loss is applied after forming a material having a large internal loss after forming a woven fabric such as a fiber into a desired shape, or a woven cloth impregnated with a shaping material is coated with a material having a large internal loss such as an acrylic resin Alternatively, a structure in which a synthetic resin film is thermoformed into a desired shape is used.

[Problem to be Solved] In a conventional vibration system component having such a structure, when a woven fabric is used as a base material, since a fibrous woven fabric lacks elasticity, it is evenly subjected to a stress caused by vibration. It cannot be deformed, and there is a drawback that a fold is formed at a portion where stress is concentrated at the time of a large displacement, thereby deteriorating linearity and shortening the life.

In addition, even when a synthetic resin film is used, anti-resonance or high-frequency resonance becomes significant due to poor mechanical internal loss of the synthetic resin film, thereby deteriorating the sense of hearing. There is a problem to be solved that anti-resonance must be suppressed.

Therefore, the present invention solves the problems of the conventional example by forming a laminated material obtained by laminating elastomers having different structures into a desired shape to form a vibrating component of the speaker such as the edge, the dust cap and the soft dome diaphragm. The purpose is to:

Means for Solving the Problems A laminated material for a vibration component of a speaker and a speaker vibration component according to the present invention for achieving the above object will be described with reference to FIG. 1 showing an embodiment. Laminate an elastomer thin film 2 made of a thermoplastic urethane elastomer or an acrylic resin on both sides or one side of a core material 1 made of a network-like nonwoven fabric structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. A vibrating component laminated material, a speaker edge obtained by molding the vibrating component laminated material into a predetermined shape, a dust cap, and a soft dome diaphragm. .

[Operation] The laminated material for a vibration component having such a configuration is a very low-melting nonwoven fabric structure in which the core material is a network-like nonwoven fabric structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. High density, high mechanical internal loss, and high elongation. Also, since the airtightness is provided by the elastomer thin film 2 laminated on the surface, the soft dome diaphragm, edge and dust cap of the speaker using the above laminated material are extremely lightweight, and the soft dome diaphragm and dust cap are used. In the case of (1), the efficiency of the loudspeaker is increased due to the light weight, and remarkable resonance and anti-resonance are suppressed because the mechanical internal loss is large, so that the frequency characteristic is improved. In the case of an edge, since the elongation is large, the stress is evenly relaxed against deformation, the linearity is improved, the distortion rate of the sound reproduced from the speaker is reduced, and the fatigue of the material due to stress concentration is reduced. Since it hardly occurs, the life of the speaker is prolonged.

FIG. 1 is an enlarged cross-sectional view of a laminated material of the present invention. The core material is a mesh-shaped nonwoven structure in which thermoplastic urethane elastomers are partially melted and bonded by melt-blowing. An elastomer thin film 2 is laminated on both surfaces of the substrate 1 by hot pressing.

First Embodiment: A core material 1 made of a thermoplastic urethane elastomer non-woven fabric structure having a thickness of 0.65 mm and a bulk density of 0.3 g / cm ³ is sandwiched by a thermoplastic urethane elastomer thin film 2 having a thickness of 0.02 mm and hot pressed at 120 ° C. Thus, a laminated material for a vibration component having a thickness of 0.5 mm was obtained.

Second Example: A coating liquid having a viscosity of 7000 cps by adding 3 parts of a citrus accelerator to 85 parts of a 35 wt% emulsion of an acrylic ester copolymer composed of 30 parts of methyl acrylate and 70 parts of butyl acrylate and diluting with ammonia water. With a thickness of 0.65m
m, coated on both sides of a core material 1 comprising a thermoplastic urethane elastomer non-woven fabric structure having a bulk density of 0.3 g / cm ³ ,
Dry at 100 ° C to form a film, then hot press at 120 ° C to
A 0.5 mm laminated material for vibration parts was obtained.

Third Example: The laminated material of the first example was formed into a dome shape having a diameter of 25 mm to produce a soft dome diaphragm for a dome speaker.

Table 1 compares the physical properties of the soft dome diaphragm with the physical properties of a conventional soft dome diaphragm (a diaphragm in which a polyester fiber cloth is impregnated with a phenol resin and hot-pressed and a braking material is applied). Show.

Density is reduced by about 40% and stiffness is increased by a factor of about 5. Tan δ, which represents the internal mechanical loss of the material, is about four times higher.

FIG. 2 shows the frequency characteristic (solid line) of the third embodiment when assembled to a speaker and the frequency characteristic (dotted line) of a conventional diaphragm.

Fourth Example: A dust cap for a dome speaker was prepared by molding the laminated material of the first example into a dome shape having a diameter of 60 mm.

The physical properties of the dust cap are shown in Table 2 in comparison with those of a conventional dust cap (a dust cap obtained by vacuum forming a polypropylene sheet).

Density is reduced by about 40% and stiffness is increased by about 4.5 times.
Tan δ, which represents the internal mechanical loss of the material, is about 1.5 times as high.

Fifth Embodiment: The laminated material of the first embodiment was formed into an annular roll shape having an inner diameter of 154 mm and an outer diameter of 180 mm, thereby producing a speaker edge.

Of the physical properties of the edge, Table 3 shows the elongation percentage, which is important as an edge, in comparison with the elongation percentage of a conventional edge (an edge obtained by hot pressing a sheet of a simple thermoplastic urethane elastomer).

The elongation rate is about 7 times as compared with the conventional example.

As described above, the laminated material for a vibrating component according to the present invention and the vibrating component for a speaker formed by the laminated material have been described in detail based on the typical examples. The embodiment of the vibrating component is not limited to the structure of the above-described embodiment, but may be appropriately modified as long as it has the components described in the above claims, exhibits the function of the present invention, and has the effects described below. It can be implemented.

[Effects] (1) The laminated material for a vibration component according to the present invention has a very low density because the core material is a network-like nonwoven fabric structure in which fine short fibers of thermoplastic urethane elastomer are partially fused and bonded. And the internal mechanical loss is large and the elongation is large. Furthermore, airtightness is maintained by an elastomer thin film laminated on the surface.

(2) The soft dome diaphragm and dust cap for a loudspeaker made of the laminated material are extremely lightweight, so that the efficiency of the loudspeaker is high and the mechanical internal damage is large, so that remarkable resonance and anti-resonance are suppressed. As a result, the frequency characteristics are improved.

FIG. 2 shows a frequency characteristic (solid line) of the speaker using the soft dome diaphragm made of the laminated material of the first embodiment.
The efficiency is higher than the frequency characteristic of the speaker using the conventional diaphragm shown by the dotted line in the figure, and the efficiency is remarkably high especially in the band of 10 KHz or more, and the reproduction band is wide.

(3) The edge of the speaker made of the laminated material has a large elongation rate, so that the stress is uniformly relieved by the deformation, the linearity is improved, and the distortion rate of the reproduced sound of the speaker is improved. Decrease. Therefore, in combination with the above item (2), a high-quality reproduced sound with excellent audibility can be obtained.

(4) A speaker edge made of the laminated material has a high elongation rate, so that fatigue of the material due to stress concentration hardly occurs, and the life of the speaker is prolonged, and the quality is stable for a long time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminated material for a vibrating component of the present invention, and FIG. 2 is a frequency characteristic diagram of a speaker using a vibrating component using the laminated material for a vibrating component. 1 is a core material and 2 is an elastomer thin film.

Claims (6)

(57) [Claims] An elastomer thin film (2) is laminated on both sides or one side of a core material (1) composed of a network-like nonwoven fabric structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. A laminated material for vibration parts, characterized by the following. 2. A laminated material for a vibration component according to claim 1, wherein said elastomer thin film (2) is made of a thermoplastic urethane elastomer. 3. A laminated material for a vibration component according to claim 1, wherein said elastomer thin film (2) is made of an acrylic resin. 4. A laminate in which an elastomer thin film (2) is laminated on both surfaces or one surface of a core material (1) composed of a network-like nonwoven fabric structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. An edge for a speaker, comprising a material. 5. A laminate in which an elastomer thin film (2) is laminated on both sides or one side of a core material (1) composed of a network-like nonwoven structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. A dust cap for a speaker, comprising a material. 6. An elastomer thin film (2) is laminated on both surfaces or one surface of a core material (1) comprising a network-like nonwoven fabric structure in which fine short fibers of a thermoplastic urethane elastomer are partially melted and bonded. A soft dome diaphragm for a speaker, comprising a laminated material.