JPH1042390A - Edge for speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker which is satisfactory to environmental resistance and also has good sound quality about an edge for a speaker which is used for an acoustic device, etc. SOLUTION: An edge of a speaker is formed by using acrylic ester which includes lubricant and whose ultrahigh molecular weight has at least over one million average molecular weight as high polymer material that is impregnated or coated on its surface for air permeability prevention as well as copolymerization resin 3 and by using cloth material 4 which is impregnated or coated with thermosetting resin that works as shape adding material as base material. Thereby, a speaker which is excellent for environmental resistance and has satisfactory sound quality can be offered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker edge having high internal loss, productivity and durability.

[0002]

2. Description of the Related Art Conventionally, as a material used for an edge for a speaker, a material obtained by coating or impregnating a synthetic rubber latex on a cloth or paper base material impregnated with a thermosetting resin, a thermoplastic elastomer, a urethane foam material, or the like is used. Have been.

Recently, a rear tray mount speaker for a vehicle and a speaker for a PA used outdoors are exposed to sunlight and heat for a long time, and the applications that require higher heat resistance and durability than before are increasing.

In addition, door-mounted speakers for vehicles are required to have higher water resistance than ever before in order to prevent car shampoos from entering when using a car washer in a vehicle. In addition, since automatic unmanned production by machines is occupying the mainstream in the production of speaker diaphragms, productivity corresponding to automatic machines, such as the ability to be reliably released from the molding die during molding, is higher than before. Productivity is required.

Furthermore, in response to market demands for reproducing human voices more faithfully than before, such as the adoption of high-definition video equipment and the spread of in-vehicle speakers for car navigation, in particular, audio within the reproduction band of speakers has been developed. There is a demand for improved mid-range performance for playback.

[0006]

However, in conventional loudspeaker edges, when exposed to a high temperature for a long period of time, the synthetic rubber thermally ages and loses its flexibility, or the thermoplastic elastomer loses its heat and loses its support performance. If the urethane resin is lost or is exposed to light for a long time, the urethane resin is deteriorated by light and loses the support performance as an edge, thus giving rise to a problem of increasing durability.

In addition, since the internal loss of the material itself is small, edge resonance is likely to occur, and a peak or a dip of the output sound pressure characteristic is likely to occur in a middle sound range deeply related to human voice in a reproduction band of the speaker. Was something.

In a conventional speaker edge, a polymer material coated on the surface thereof is heated and melted at the time of edge molding to prevent air permeability of the edge, and is thermally bonded at the same time as the edge molding. However, there is a problem in that the adhesive is unstable due to insufficient flow due to heat and pressure to escape from the bonding interface, and conversely, lack of tackiness when heat and pressure are applied.

SUMMARY OF THE INVENTION The present invention solves these problems and can provide an inexpensive speaker edge having good sound quality and durability and good productivity.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a high molecular weight polymer having an average molecular weight of at least 1,000,000 or more as a polymer material impregnated or coated on the surface of the edge material to prevent air permeability. A cloth material or a paper material impregnated or coated with a thermosetting resin as a shape-imparting material is used as a base material of the acrylate resin having the above-mentioned formula.

The acrylate resin has an average molecular weight of 1
Since it is as large as one million or more, even if molecular breakage due to light occurs in a part of the molecule, the overall resin physical properties are not significantly reduced, and the weather resistance is good. Also, when the diaphragm and the edge are bonded, the viscosity at the time of melting is very high, the flow due to heat and press pressure is unlikely to occur, and the tackiness at the time of melting is large because the resin stays at the interface of the bonding. And good adhesion.

Further, since the internal loss of the resin is larger than that of the conventional rubber latex or the like, the edge resonance of the speaker hardly occurs, and the peak and the dip of the sound pressure frequency characteristic in the middle sound range hardly occur. Further, since the resin is rich in flexibility, the linearity of the amplitude is excellent, and a clear sound quality with low harmonic distortion in a low frequency range can be realized.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
Ultra-high molecular weight acrylic having an average molecular weight of at least 1,000,000 or more, containing a lubricant as a polymer material impregnated or coated on the surface of the speaker edge for holding the outer peripheral portion of the diaphragm to prevent air permeability. Uses an acid ester or its copolymer resin, and uses a cloth or paper material obtained by impregnating or coating a thermosetting resin as a shape-imparting material as its base material, and has excellent sound quality and excellent durability. It is possible to provide a speaker edge having high productivity.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is a perspective sectional view for explaining a speaker edge of the present invention, FIG. 2 is a frequency characteristic diagram of a speaker using the present invention, and FIG. 3 is a frequency characteristic of a speaker of a comparative example. FIG.

Referring to FIG. 1, reference numeral 1 denotes a diaphragm, 2 denotes an edge having an outer periphery joined to the inner periphery of the diaphragm 1, 4 denotes a cloth material of the edge 2, and 3 denotes an ultrahigh molecular weight acrylic. A coating layer or an impregnated layer of the edge 2 made of an acid ester or a copolymer resin thereof.

Next, the speaker edge of the present embodiment will be described together with a comparative example. First, the speaker edge according to the present embodiment has a yarn thickness of 30th, the number of vertical and horizontal driving is 68, and the weight per unit m ² is 120 g.
/ M ² plain woven cotton cloth impregnated with 5 g / m ² of phenolic resin, and on one side surface, 105 g / m ^{2 of} an acrylic copolymer aqueous emulsion (43% solid content) having an average molecular weight of 1.5 million and containing acrylamide mixed therein. It was coated and dried by heating to produce an edge material having a weight per unit m ² of 170 g / m ² . Paraffin wax having a melting point of 120 ° C. was previously mixed with the acrylic copolymer emulsion at a weight ratio of 1%.

Next, as Comparative Example 1, the same raw material was coated as a SBR rubber latex with only the coating resin so as to have the same dry weight, and the edge raw material having a weight per unit m ² of 170 g / m ² was similarly obtained. Was prepared.

As Comparative Example 2, a foaming density of 0.03
5 g / cm ³ ester-based urethane foam resin 0.6 mm thick
An urethane edge material was sliced into a piece.

Using the raw material of the above embodiment and the raw material of Comparative Example 1 as edges, a cone outer diameter of 74 mm and a total height of 17
mm, F0 of wavy edge shape with edge outer diameter φ98mm is 80
A 10 cm aperture speaker of 10 Hz (all parts having the same specifications except for the edge material were used) was fabricated, and the results of measuring the frequency characteristics of the speaker are shown in FIGS. 2 (frequency characteristic diagram of the speaker of the present embodiment) and FIG. This is shown in FIG.

2 and 3, the loudspeaker using the edge according to the present embodiment has significantly improved peaks and dips in the so-called edge resonance range from 500 Hz to 1500 Hz as compared with Comparative Example 1.

Next, under the conditions of a press pressure of 5 kg / cm ² , a mold temperature of 210 ° C., a press time of 10 seconds, a thickness of 0.3 mm, a width of 2 mm, and Length 15mm
A test piece of a flat plate was prepared. Here, the direction of the fiber of the test piece was adjusted so as to be oriented in the length direction. When the internal loss was measured by the vibration reed method using this test piece, the internal loss was 0.150 in the present embodiment, 0.065 in Comparative Example 1, and the internal loss was 0.065 in the present embodiment. It was confirmed that the loss was excellent.

Next, the roll of the present embodiment and the rolls of Comparative Example 1 and Comparative Example 2 have a roll outer diameter of 132 mm and an inner diameter of 1 mm.
It is molded into a roll edge having a roll diameter of 14 mm and a roll diameter of 4.5 mm, weighs 2.3 g, and has a voice coil inner diameter of 26.3 mm.
Attached to paper pulp cone paper with slope R100, temperature cycle test (1 hour at low temperature -30 ° C ± 2 ° C, 1 hour temperature change from low to high temperature, 1 hour at high temperature 85 ° C ± 2 ° C, 1 hour at high temperature The temperature change time from low to low is defined as one cycle, and the resonance frequency (hereinafter, referred to as F
As a result of measurement of the change of “o”, after 5000 cycles, Fo of Comparative Example 1 increased by 50%, Fo of Comparative Example 2 decreased by 30%, and that of the present embodiment was about 9%. % Decline.

As a result of the above temperature cycle test, it was confirmed that in this embodiment, deterioration such as hardening, brittleness and hardening due to environmental changes was small.

When the same cone paper as above was stuck and left in a humidified bath at 70 ° C. and 95% for 2500 hours, Comparative Example 1 was 28% and Comparative Example 2 was 80%.
%, And that of the present embodiment was confirmed to have a 19% reduction in supporting force.

Further, a weather resistance test was performed with a xenon fade meter under the condition of a black panel temperature of 63 ° C.
When the change of Fo after irradiation for 0 hours was measured, Comparative Example 1 was obtained.
In this case, a 21% increase was observed, Comparative Example 2 exhibited a 40% decrease, and in the present embodiment, an 8% decrease was confirmed.

As described above, it was confirmed that the present embodiment was excellent in any of the temperature cycle test, the wet standing test, and the weather resistance test.

The same test was conducted with an average molecular weight of 1,000,000,
Table 1 shows the results obtained by using a raw material using a copolymer resin of 2,000,000 ultrahigh molecular weight acrylates.

[0028]

[Table 1]

As a result of Table 1, it was confirmed that the temperature cycle test did not significantly differ from that of the present embodiment, and the weather resistance test confirmed that the higher the molecular weight, the better.

[0030]

As described above, the present invention provides an acrylic resin having an average molecular weight of at least 1,000,000 or more as a polymer material impregnated or coated on the surface of the edge material to prevent air permeability. By using a cloth material or paper material impregnated or coated with a thermosetting resin as a shape-imparting material as the base material using the copolymer, weather resistance, moisture resistance, etc. can be improved and peaks can be improved. This makes it possible to obtain a speaker having a good sound quality with little dip.

[Brief description of the drawings]

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

FIG. 2 is a frequency characteristic diagram of the speaker according to the embodiment;

FIG. 3 is a frequency characteristic diagram of the speaker of Comparative Example 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Edge 3 Ultra-high molecular weight acrylic resin coating layer / impregnation layer 4 Cloth material

Claims (1)

[Claims] 1. An edge material which is on the outer peripheral portion of a diaphragm and holds the same as a polymer material impregnated or coated on the surface to prevent air permeability. The lubricant contains a lubricant having an average molecular weight of at least 1,000,000 or more. A loudspeaker edge characterized by using an ultra-high molecular weight acrylate ester and its copolymer resin, and using a cloth or paper material impregnated or coated with a thermosetting resin as a shape-imparting material as its base material. .