JP2010193241A - Speaker diaphragm, speaker employing speaker diaphragm, electronic apparatus employing speaker and mobile means - Google Patents

Abstract

The present invention relates to a loudspeaker diaphragm used for various audiovisual equipment and moving means, and a loudspeaker using the diaphragm, and to improve sound pressure in a high sound range and expand a reproduction band. Objective.
To achieve this object, a speaker diaphragm of the present invention is a speaker diaphragm manufactured by a papermaking method, and contains at least 3 wt% of an amorphous hydrous silicate. Thus, the rigidity of the whole speaker diaphragm can be improved by blending an amorphous hydrous silicate having excellent rigidity. As a result, it is possible to improve the sound pressure in the high sound range of the speaker and expand the reproduction band.
[Selection] Figure 1

Description

  The present invention relates to a speaker diaphragm used in various audio equipment and video equipment, a speaker using the same, an electronic device such as a stereo set using the speaker, and a moving means such as an automobile.

  In recent years, a papermaking diaphragm that can be manufactured in large quantities at a low cost is mainly used as a diaphragm for audio speakers for home use or in-vehicle use.

  However, paper-making diaphragms centering on such paper diaphragms generally have lower rigidity and lower sound quality as a result, compared to diaphragms made of metal or resin materials. Had a tendency to become.

  In response to this problem, Patent Document 1 discloses a technique in which bamboo bamboo fibers are mixed into papermaking pulp, paper is made, and a speaker diaphragm is formed using this.

That is, in the technology described in Patent Document 1, the rigidity of the speaker diaphragm as a finished product is improved by forming the speaker diaphragm by entwining very thin fibers of bamboo bamboo with coarse fibers of ordinary pulp. It was intended to enhance and improve its sound quality.
JP 2000-324591 A

  Certainly, according to the method described in Patent Document 1, it was possible to increase the rigidity of the speaker diaphragm and improve the sound quality of the speaker.

  However, it has been difficult to obtain sufficient rigidity to sufficiently satisfy the requirements such as sound pressure improvement in the high sound range and expansion of the reproduction band as further demands from audio manufacturers and automobile manufacturers.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve these problems, to sufficiently improve the rigidity of a speaker diaphragm, and to improve sound pressure in a high sound range and expand a reproduction band.

  In order to achieve this object, the speaker diaphragm of the present invention is a speaker diaphragm manufactured by a papermaking method, and includes at least 5 wt% of an amorphous hydrous silicate.

  According to the present invention, it is possible to improve the sound pressure in the high sound range and expand the reproduction band of the speaker diaphragm.

  This is because the speaker diaphragm includes an amorphous hydrous silicate.

  In other words, an amorphous hydrous silicate body with excellent rigidity is blended into the speaker diaphragm, and the rigidity of the speaker diaphragm as a whole is improved by intertwining the fibers constituting the speaker diaphragm and the amorphous hydrous silicate body. It can be made.

  As described above, according to the present invention, the rigidity of the speaker diaphragm can be sufficiently improved. As a result, the sound pressure can be improved and the reproduction band can be increased in the high sound range of the speaker diaphragm.

(Embodiment 1)
Hereinafter, the speaker diaphragm 1 in the present embodiment will be described.

  FIG. 1 is a cross-sectional view of a speaker diaphragm 1 according to the present embodiment.

The speaker diaphragm 1 is manufactured by papermaking a material obtained by reducing the beating degree of bamboo fibers obtained from bamboo over 1 year old to a microfibril state. Silicate body (SiO ₂ .nH ₂ O) is contained.

  This plant opal is excellent in rigidity and can be extracted from leaves of grasses, mosses and the like with an acid or the like. In the present embodiment, this plant opal is blended in the paper making process of the speaker diaphragm 1.

  And by including this plant opal, the diaphragm 1 for speakers has very excellent rigidity.

  That is, the rigidity of the speaker diaphragm 1 as a whole is improved by blending plant opal excellent in rigidity.

  As a result, the speaker diaphragm 1 is excellent in sound pressure and reproduction band in the high sound range. The bamboo fiber is used as the main component of the speaker diaphragm 1 of the present embodiment. However, the present invention is not limited to this, and the speaker vibration is mainly composed of kraft pulp obtained from a coniferous tree through a beating process. Even if it is a plate, it is possible to improve rigidity by blending plant opal, and to improve the sound pressure in the high sound range and expand the reproduction band.

  Here, the content ratio of the plant opal in the speaker diaphragm 1 is set to 5 wt% or more. This is because if the content ratio of the plant opal is 5 wt% or more, the rigidity of the speaker diaphragm 1 can be reliably improved. On the contrary, when the content ratio of the plant opal is 5 wt% or less, it is not possible to sufficiently improve the sound pressure in the high sound range and expand the reproduction band.

  Furthermore, in order to improve the rigidity of the speaker diaphragm 1, it is necessary to strengthen the entanglement between the bamboo fiber, which is the main component of the speaker diaphragm 1, and the plant opal. Therefore, in the speaker diaphragm 1, the average particle diameter of the plant opal is set to 100 μm or less. Thus, if the particle diameter of the plant opal is relatively small, the plant opal and the bamboo fiber are sufficiently intertwined, and the rigidity of the speaker diaphragm 1 is further increased. However, from the viewpoint of handling in the paper making process, the average particle size of the plant opal is preferably 10 μm or more. For these reasons, it is desirable that the average particle size of the plant opal is 10 μm or more and 100 μm or less.

  Here, the diaphragm 1 for speakers is composed of bamboo fibers whose main component is one year old or older. This is because bamboo fiber that has passed the age of 1 year or more has excellent rigidity and flexibility, has good compatibility with the plant opal, and can improve the rigidity of the diaphragm 1 for speakers. . If the content ratio is 40 wt% or more, sufficient rigidity can be secured for the speaker diaphragm. On the contrary, if the content ratio of bamboo fiber is less than 40 wt%, the feature of bamboo fiber is hardly exhibited.

  Further, when the bamboo fiber used for the speaker diaphragm 1 is reduced to a microfibril state, the entanglement between the bamboo fibers and further the entanglement between the bamboo fibers and the plant opal can be enhanced. As a standard for microfibrillation, beating is preferably performed so that the average fiber diameter of bamboo fibers is 1 μm or less. If the average fiber diameter of the bamboo fibers is larger than 5 μm, it is possible to give the speaker diaphragm 1 the characteristics as bamboo fibers, but strengthen the entanglement between the bamboo fibers and between the plant opal and the bamboo fibers. Insufficient power to make.

  The material constituting the speaker diaphragm 1 other than the plant opal and bamboo fiber is not particularly limited. For example, softwood pulp that is a main material of a conventional papermaking diaphragm may be used. You may comprise the diaphragm 1 for a plant by a plant opal, bamboo fiber, and conifer pulp. Thus, even when blended with softwood pulp, the characteristics of plant opal and bamboo fiber are sufficiently exhibited.

  Bamboo fiber grows much faster than conifers and has a strong fertility. Utilizing this feature, beating bamboo fibers instead of coniferous trees and using them as a material for speaker diaphragms is also effective from the standpoint of countermeasures for reducing coniferous trees screamed in recent years.

  By the way, when bamboo fiber is used as a speaker diaphragm in this way, the material of the speaker diaphragm is the bamboo stem portion, and the leaf portion is not used as the speaker diaphragm. Therefore, the remaining leaf portion has no use, and can even be discarded.

  On the other hand, this bamboo leaf portion contains a lot of plant opal which is the main point of the present invention.

  Therefore, paying attention to this point, in the present embodiment, the plant opal to be blended in the speaker diaphragm 1 is extracted from the grass family, particularly from bamboo. In this way, bamboo can be used as a material for the speaker diaphragm 1, and the rigidity of the speaker diaphragm 1 can be enhanced without newly using a material other than bamboo. That is, when the speaker diaphragm 1 is manufactured, the bamboo leaf portion discarded when manufacturing the speaker diaphragm using the conventional bamboo fiber can be effectively used, and the rigidity is enhanced. Since it is not necessary to use materials other than bamboo, it is excellent in terms of cost.

  In order to strengthen the entanglement between bamboo fibers and the entanglement between bamboo fibers and plant opal, it is desirable to promote feathering of the bamboo fiber surface. If the bamboo fiber thus feathered is used, the entanglement between the bamboo fibers or between the bamboo fibers and the plant opal can be further strengthened, and the rigidity of the speaker diaphragm 1 can be further improved. .

If the BET specific surface area is 1 m ² / g or more, the bamboo fiber feathers or bamboo fiber and plant opal are sufficiently intertwined to ensure the rigidity of the diaphragm 1 for speakers. Can be improved.

  Furthermore, in order to improve the rigidity of the diaphragm 1 for speakers, the surface of the plant opal is preferably treated with a compound that forms a chemical bond with bamboo fiber cellulose.

  For example, when a surface treatment of plant opal is performed using a hydroxyl group or alkoxysilyl group-containing compound, the bamboo fiber surface and the plant opal surface form hydrogen bonds, and the plant opal and bamboo fiber are not only physically bonded but also chemically bonded. Can also be combined. As a result, the rigidity of the speaker diaphragm 1 can be further improved.

  In this case, the alkoxysilyl group-containing compound used as the surface treatment agent is preferably an aminosilane compound. The amino silane compound has not only an alkoxysilyl group that acts on the surface of cellulose or plant opal, but also has an amino group in a portion other than the alkoxysilyl group and is hydrophilic. Familiarity is good. As a result, the bamboo fibers are entangled so as to wrap the plant opal, and the rigidity of the speaker diaphragm 1 can be further improved.

  As described above, the speaker diaphragm 1 in the present embodiment has excellent rigidity, and as a result, the sound pressure and the reproduction band in the high sound range can be improved.

(Embodiment 2)
Hereinafter, the speaker 2 using the speaker diaphragm 1 described in the first embodiment will be described.

  FIG. 2 shows a cross-sectional view of the speaker 2 of the present embodiment.

  As shown in FIG. 2, a magnetized magnet 3 is sandwiched between an upper plate 4 and a yoke 5 to constitute an internal magnet type magnetic circuit 6.

  A frame 7 is coupled to the yoke 5 of the magnetic circuit 6. The outer periphery of the speaker diaphragm 1 described in the first embodiment is bonded to the peripheral portion of the frame 7 via an edge 8. One end of a voice coil bobbin 9 is coupled to the central portion of the speaker diaphragm 1. A voice coil 10 is wound around the other end of the voice coil bobbin 9, and the voice coil 10 is movably disposed in a magnetic gap 11 formed by the magnetic circuit 6.

  The speaker having the inner magnet type magnetic circuit 6 has been described above. However, the present invention is not limited to this, and the speaker diaphragm 1 may be applied to a speaker having an outer magnet type magnetic circuit.

  Furthermore, the present invention can also be applied to a small speaker in which the speaker diaphragm 1 and the edge 8 are integrated.

  As described in the first embodiment, the speaker diaphragm 1 has excellent rigidity and excellent sound pressure and reproduction band in the high sound range, and the speaker 2 to which this is applied realizes good sound quality. can do.

(Embodiment 3)
Hereinafter, the mini component system 12 using the speaker 2 described in the second embodiment will be described.

  FIG. 3 shows an external view of an audio mini-component system 12 that is an electronic device equipped with the speaker 2.

  As shown in FIG. 3, the mini component system 12 of the present embodiment includes an enclosure 13 in which a speaker 2 is incorporated, an amplifier 14 that is an amplifying means for an electric signal input to the speaker 2, and an input to the amplifier 14. And a player 15 for outputting the source to be output.

  By adopting this configuration, the mini component system 12 can improve the sound pressure in the high sound range and can improve the sound quality by expanding the reproduction band, which could not be realized conventionally.

(Embodiment 4)
Hereinafter, the vehicle 16 using the speaker 2 described in the second embodiment will be described.

  FIG. 4 shows a sectional view of the vehicle 16 on which the speaker 2 is mounted.

  As shown in FIG. 4, the vehicle 16 according to the present embodiment is one in which the speaker 2 is incorporated in a rear tray or a front panel and used as a part of car navigation or car audio.

  By adopting this configuration, the vehicle 16 can achieve higher sound quality in the sound pressure improvement in the high sound range and the expansion of the reproduction band.

  The loudspeaker diaphragm, the loudspeaker, the electronic device and the device according to the present invention are applied to electronic devices such as audiovisual equipment and information communication equipment that require improvement in sound quality and characteristics by a highly rigid diaphragm, and further to devices such as automobiles. Applicable.

Sectional drawing of the diaphragm for speakers in Embodiment 1 of the present invention. Sectional drawing of the speaker in Embodiment 2 of this invention External view of minicomponent system in Embodiment 3 of the present invention Sectional drawing of the vehicle in Embodiment 4 of this invention

DESCRIPTION OF SYMBOLS 1 Speaker diaphragm 2 Speaker 3 Magnet 4 Upper plate 5 Yoke 6 Magnetic circuit 7 Frame 8 Edge 9 Voice coil bobbin 10 Voice coil 11 Magnetic gap 12 Mini component system 13 Enclosure 14 Amplifier 15 Player 16 Vehicle

Claims (11)

This is a speaker diaphragm manufactured by the papermaking method.
A speaker diaphragm containing at least 5 wt% of an amorphous hydrous silicate. The speaker diaphragm according to claim 1, wherein the amorphous hydrous silicate is extracted from a gramineous plant. The speaker diaphragm according to claim 2, wherein the amorphous hydrous silicate is extracted from bamboo. The speaker diaphragm according to claim 1, comprising at least 40 wt% of bamboo fiber. The speaker diaphragm according to claim 4, wherein a beating degree of the bamboo fiber is reduced to a microfibril state. The speaker diaphragm according to claim 4, wherein the bamboo fiber has a BET specific surface area of at least 1 m ² / g. The speaker diaphragm according to claim 1, wherein a surface of the amorphous hydrous silicate is surface-treated with a hydroxyl group-containing compound or an alkoxysilyl group-containing compound. The speaker diaphragm according to claim 7, wherein the alkoxysilyl group-containing compound is aminosilane. A speaker diaphragm;
The outer periphery of the speaker diaphragm is coupled, and a frame coupled to the magnetic circuit body;
A voice coil coupled to the speaker diaphragm and movably disposed in a magnetic gap formed by the magnetic circuit body;
The speaker diaphragm is manufactured by a papermaking method and includes at least 5 wt% of an amorphous hydrous silicate. Speakers,
An electronic device including at least an amplification unit of an input signal to the speaker,
The speaker is
A speaker diaphragm manufactured by a papermaking method and containing at least 5 wt% of an amorphous hydrous silicate,
The outer periphery of the speaker diaphragm is coupled, and a frame coupled to the magnetic circuit body;
An electronic device having at least a voice coil coupled to the speaker diaphragm and movably disposed in a magnetic gap formed by the magnetic circuit body. A speaker diaphragm manufactured by a papermaking method and containing at least 5 wt% of an amorphous hydrous silicate,
The outer periphery of the speaker diaphragm is coupled, and a frame coupled to the magnetic circuit body;
A moving means on which a speaker including a voice coil that is coupled to the speaker diaphragm and is movably disposed in a magnetic gap formed by the magnetic circuit body is mounted.

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