JP2010130378A - Speaker diaphragm member, speaker diaphragm using the same, speaker edge, and speaker using the same - Google Patents

Abstract

The present invention provides a loudspeaker diaphragm member having a high sound quality and low distortion, a loudspeaker diaphragm member and a loudspeaker edge using the loudspeaker member, and a loudspeaker using the same.
SOLUTION: A diaphragm uses a cellulose rayon fiber cloth made of bamboo as a diaphragm member, and an acrylic special coat is applied to the cloth material, and a conventional cotton or nylon fiber and a rubber coat material. The elastic modulus is improved more flexibly than those formed by combining the above.
[Selection] Figure 1

Description

  The present invention relates to a speaker diaphragm member used in various audio equipment and video equipment, a speaker diaphragm using the same, a speaker edge, and a speaker using the same.

  In the recent audio industry and the automobile industry equipped with audio equipment, with the widespread use of digital equipment, the playback band and SN ratio are dramatically improved, and lower distortion of speakers is demanded more than ever.

  In these industries, the trend toward speakers is high sound quality and environmentally conscious, and in order to realize sound quality demands, the diaphragm as a vibration member, which is the main component of loudspeakers that determine the sound quality, is important. Development is urgent.

The prior art will be described with reference to a sectional view of the dome speaker for tweeter shown in FIG.
According to the figure, reference numeral 1 denotes a frame, which is formed by resin molding. 2a is a yoke made of a magnetic material such as iron, which is mounted on the frame 1 by integral molding or press-fitting, 2b is a magnet joined to the bottom surface of the yoke 2a, and 2c is an upper part joined to the magnet 2b. 2d is a magnetic gap between the inner peripheral surface of the yoke 2a and the outer peripheral surface of the upper plate 2c. A magnetic circuit 2 is formed by the yoke 2a, the magnet 2b, and the upper plate 2c.

  3 is disposed so that one end of the magnetic cap 2d on which the voice coil 3a is formed is located, and the other end is adhesively bonded to the speaker diaphragm 4 whose outer periphery is adhesively bonded to the frame 1 via the speaker edge 4a. Bobbins.

The speaker diaphragm 4 is a tweeter soft diaphragm in which a material obtained by coating a fabric material with a rubber agent is curved as shown in the figure for ease of manufacture.
In addition, although the material in which the cloth material is coated with a rubber agent is not particularly described, the inner periphery is bonded to the outer periphery of the paper cone paper used for a general speaker, the outer periphery is bonded to the frame 1, It is also often used as a speaker edge 4a that supports cone paper.

As described above, a material obtained by coating a cloth material with a rubber agent is widely used as a speaker diaphragm member such as a speaker diaphragm or a speaker edge.
As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
Japanese Patent Publication No.58-21480

  In a speaker such as a tweeter for sound reproduction, a diaphragm coating material that has a great influence on sound quality is coated with a rubber coating agent on the cloth described above for ease of manufacture and less distortion. A diaphragm formed by molding with is often used.

  The cloth diaphragm tends to have a slightly lower sound pressure than a metal or film system, but the distortion sound is relatively small. However, in the weaving method and fibers of the cloth base material, particularly the synthetic fiber, the frequency band of the unique rubbing sound and the distortion sound generated when the base material itself is bent overlaps with the vocal band, which is one of the causes of sound quality deterioration.

  The present invention solves the above-described problems, reduces the noise generated by the diaphragm itself, and realizes high-quality sound reproduction and low distortion improvement as a speaker, and a speaker using the same. Provided are a diaphragm for a speaker, an edge for a speaker, and a speaker using these.

  In order to solve the above-mentioned problems, the present invention comprises at least a diaphragm member for a speaker made of a cloth material using cellulose rayon made from bamboo.

  As described above, the diaphragm member for a speaker according to the present invention is formed by using cellulose rayon made of bamboo as a cloth material, thereby improving the elastic modulus of the cloth material and unnecessary rubbing sound and distortion sound. In addition, it is possible to achieve environmental harmony such as weight reduction and use of bamboo.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the description, the same parts as those in the prior art are denoted by the same reference numerals, description thereof is omitted, and only differences are described.
(Embodiment 1)
A speaker according to an embodiment of the present invention will be described with reference to a side sectional view of the dome speaker for tweeter in FIG. 1 and the same characteristic diagram in FIG.

  According to the figure, the difference from the prior art lies in the speaker vibration member. A bamboo cellulose rayon fiber cloth material is applied to the speaker diaphragm 4b as the speaker vibration member used in the dome speaker of the present embodiment. This is the point used.

The diaphragm member for forming the speaker diaphragm 4b is made of bamboo cellulose rayon fiber cloth as described above, and has a basis weight of 100 g / m ² and an acrylic resin having a molecular weight of 500,000 or more as a coating agent. It is molded by a mold using a material coated at a weight of 50 g / m ² .

In addition, the speaker of FIG. 1 is produced as a semicircular dome shape with a diameter of 25 mm, and the sound pressure frequency characteristics compared with the conventional one are shown in FIG.
Regarding the bamboo cellulose rayon fiber content in the cloth material used for the speaker diaphragm of the present invention, 50% or more is suitable for improving the physical properties. If possible, a 100% product is desirable.

Although the basis weight by weight of the bamboo cellulose rayon fabrics used in the speaker diaphragm of the present invention was 100 g / m ^2, the strength of the diaphragm 4b 70~120g / m ² is an on sound pressure improvement by weight It was confirmed that it was in the desired range for guaranteeing.

  In addition, it is an acrylic coating agent applied to bamboo cellulose rayon cloth material. By using a special coating agent with a molecular weight of 500,000 or more, the coating amount can be reduced compared to general rubber coating agents. In addition, sufficient physical properties can be obtained for use as the speaker diaphragm 4b. As a result, a speaker diaphragm capable of high sound pressure, high sound quality, and low distortion can be obtained.

In the first embodiment, has been described as applying the coating agent of acrylic resin weight per unit area weight 50 g / ^{m 2,} if the ^{30g / m 2 ~80g / m 2} , the resulting effect of the above It was confirmed.

When the coating weight of the coating agent is less than 30 g / m ² , there is a problem in reliability. When the coating weight of the coating agent exceeds 80 g / m ² , the vibration member becomes too heavy and the high frequency reproduction is performed. And has a problem in sound pressure.
(Embodiment 2)
FIG. 3 is a side sectional view of a speaker using a cone-shaped speaker diaphragm made of paper made of general paper pulp as a speaker according to another embodiment of the present invention, and FIG. 4 is a characteristic diagram thereof. .

  According to the figure, 2h is a magnet composed of a lower plate 2e having a center pole, an annular magnet 2f superimposed on the lower plate 2e, and an annular upper plate 2g bonded and bonded on the annular magnet 2f. 1 is a frame formed from a resin molded or metal plate adhesively bonded to the upper plate 2g, 3b is a bobbin provided with a voice coil 3c at the lower end, and the voice coil 3c is the magnetic circuit 2h of the lower plate 2e is disposed in a magnetic gap 2i formed between the outer periphery of the center pole of the lower plate 2e and the inner periphery of the upper plate 2g.

  The speaker diaphragm 4d has an outer periphery adhesively bonded to the inner periphery of the speaker edge 4e, and the outer periphery of the speaker edge 4e is adhesively bonded to the frame 1a. The inner periphery of the speaker diaphragm 4d is adhesively bonded to the bobbin 3b. A damper 5 has an outer periphery adhesively bonded to the frame 1a and an inner periphery adhesively bonded to the bobbin 3b.

A diaphragm material for sound reproduction according to the present invention is obtained by applying a coating weight of an acrylic molecular weight of 500,000 or more to a basis weight of 120 g / m ² using a bamboo cellulose rayon cloth material, and a mold weight of 80 g / m ^2. The edge 4e is formed by molding, and is fixed to the outer peripheral portion of the speaker diaphragm 4d made of pulp in a conical shape with an adhesive or the like.

  FIG. 4 shows a comparison of characteristics between the speaker using the edge 4e of the second embodiment and a conventional product (the edge is rubberized), and it is confirmed that the distortion characteristics are excellent. .

Incidentally, as in the first embodiment, the basis weight by weight 70~120g / ^{m 2} bamboo cellulose rayon cloth, if the basis weight weight ^30g / ^{m 2 ~80g} / m 2 of coating agent of an acrylic resin, practicality It was confirmed that there was no problem and that it was superior to the conventional one.

  The loudspeaker diaphragm member according to the present invention is a tweeter cloth diaphragm and a cloth edge member used on the outer periphery of cone paper. This is a stable supply of materials that reduce the distortion and achieve clear sound quality with little distortion. High-quality sound and low distortion materials are audiovisual equipment and information communication equipment that require high quality and reliability, and even automobiles. It can be applied as a speaker of audio equipment such as.

Side sectional view of the speaker according to Embodiment 1 of the present invention. Acoustic characteristic diagram of the speaker of the first embodiment Side sectional view of the speaker according to Embodiment 2 of the present invention. Acoustic characteristic diagram of the speaker of the second embodiment Side sectional view of a conventional speaker

Explanation of symbols

1, 1a Frame 2, 2h Magnetic circuit 2d, 2i Magnetic gap 3, 3b Bobbin 3a, 3c Voice coil 4, 4b, 4d Diaphragm 4a, 4c, 4e Edge 5 Damper

Claims (8)

  A diaphragm member for a speaker using a cellulose rayon fiber cloth made of bamboo. The speaker diaphragm member according to claim 1, wherein the basis weight is in a range of 70 g / m ² or more and 120 g / m ² or less. The diaphragm member for a speaker according to claim 1 or 2, wherein an acrylic resin having a molecular weight of 500,000 or more is coated with a basis weight of 30 g / m ² or more and 80 g / m ² or less.   A loudspeaker diaphragm using the loudspeaker diaphragm member according to claim 1, claim 2, or claim 3.   A speaker edge using the speaker diaphragm member according to claim 1, claim 2, or claim 3.   A speaker using the speaker diaphragm according to claim 4.   A speaker using the speaker edge according to claim 5.   A speaker using the speaker diaphragm according to claim 4 and the speaker edge according to claim 5.

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