JP2009246706A - Dust cap for speaker, speaker using the same, and electronic device and apparatus using the speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve clarity by improving sound quality and improving a sound pressure level in a high tone range or the like, regarding a dust cap for the speaker used in an acoustic device, to provide the speaker, to provide an electronic device, and to provide an apparatus. <P>SOLUTION: By injection-molding a material in which at least polylactic acid resin and bamboo fibers are mixed to configure the dust cap 30 for the speaker, the rigidity of the dust cap is improved and the clarity of the speaker using the dust cap is improved by improving the sound quality and improving the sound pressure level in the high tone range or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust cap for speakers used in various audio equipment and video equipment, and electronic equipment and devices such as speakers, stereo sets, and television sets using the same.

  Conventional dust caps are made of paper and resin, and it is necessary to take a very large number of steps of making paper, and there is a problem that productivity is lower than that of resin.

  On the other hand, resin is highly productive because it is obtained by injection-molding resin pellets in a mold that has been previously set in a dust cap shape.

  As a kind of the resin material by these injection moldings, a single material such as polypropylene is generally often used.

  In addition, blend type dust caps using different types of resins exist for the purpose of adjusting physical property values as dust caps, that is, adjusting the characteristics and sound quality as speakers.

  Furthermore, with respect to the adjustment of physical property values that are difficult to adjust with these resins, reinforcing materials such as mica are mixed to adjust the physical property values and the characteristics and sound quality as a speaker.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP-A-3-289298

  Traditionally, dust caps have been intended to prevent dust from entering the magnetic gap, but in recent years speakers have become lightweight and rigid in order to fulfill the role of wideband speakers due to the development of audio and video equipment. High materials are required.

  In general, a resin dust cap is formed by injection molding of a polypropylene resin, thereby obtaining a dust cap with high productivity and excellent waterproof and moisture resistance.

  However, the speaker using the dust cap has a problem that it is disadvantageous for high clarity reproduction and high output, which is one of high sound quality because the rigidity of the dust cap material is low. .

  Further, since the base resin material is a petroleum-derived material, the amount of carbon dioxide emission is large and the environmental load is large.

  The present invention solves the above-described problems, provides a dust cap for a speaker that improves the material rigidity of the dust cap, achieves high sound quality as a speaker, enables high output and high reliability, and has a low environmental load. It is for the purpose.

  In order to achieve the above object, according to the present invention, a speaker dust cap is configured by injection molding a material in which at least a plant-derived polylactic acid resin and bamboo fiber are mixed.

  With this configuration, rigidity can be increased compared to conventional polypropylene resins, and since carbon dioxide generated during combustion and disposal is carbon dioxide originally held by plant raw materials, apparent carbon dioxide emissions The amount is lower than petroleum-derived resin. Therefore, it can be said that the material is environmentally friendly.

  Therefore, the material properties of the speaker dust cap can be improved, the rigidity and Young's modulus can be improved, and the environmental load can be reduced.

  As described above, the present invention constitutes a speaker dust cap by injection molding a material in which at least a plant-derived polylactic acid resin and bamboo fiber are mixed.

  With this configuration, the rigidity, toughness, and Young's modulus of the dust cap can be improved, the sound quality of the speaker using the dust cap can be improved, and the output and reliability can be increased. In addition, it can be said that the environmental load can be reduced and it is friendly to the global environment because the proportion of plant materials is larger than that of conventional products.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the first aspect of the present invention will be described with reference to the first embodiment.

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

  As shown in FIG. 1, the dust cap 30 is configured by injection molding a material in which a plant material polylactic acid resin and bamboo fiber are mixed.

  The bamboo fiber here is not particularly limited as long as it is a plant of the bamboo family, and it may be a bamboo that has grown and has grown for more than one year, except for bamboo shoots within the first year of the bamboo and those of the juvenile level.

  With regard to bamboo age, the rigidity and toughness required for the present invention can be secured at the minimum after one year or more, but the rigidity and toughness are further improved when two or more years have passed.

  As for the bamboo age, as described above, it is more preferable that the bamboo age is larger, except for the state of being old and decaying.

  The bamboo fiber preferably has a fiber length of 0.5 mm to 3 mm. If the fiber length of the bamboo fiber is longer than 3 mm, the bamboo fiber appears in the appearance of the molded product, and it becomes difficult to obtain a high-quality appearance.

  On the other hand, when the fiber length of the bamboo fiber is shorter than 0.5 mm, the rigidity is lowered and the reinforcing effect of the bamboo fiber is impaired.

  In addition, the bamboo fiber further includes bamboo fiber having a fiber diameter of 10 μm or less, so that the entanglement of the fiber is improved and the rigidity is increased. As a sound quality feature, the sound pressure level in the high sound range is improved. It is possible to obtain a clear and powerful sound quality in the high sound range.

  Moreover, when bamboo powder is used for bamboo fiber, even if the bamboo content is the same, including bamboo powder improves fluidity and improves moldability.

  Further, the bamboo fiber contains carbonized bamboo material, so that the elastic modulus is further improved and high rigidity can be achieved. Therefore, the band becomes wider and the sound quality is improved. In addition, bamboo charcoal, which is a carbonized bamboo material, also serves as a colorant, enabling a high-quality appearance. The carbonized bamboo material desirably has a particle size of 150 μm or less when mixed into the resin, and if it exceeds 150 μm, it becomes difficult to disperse, which may cause poor appearance and variation in quality. In addition, the form of the bamboo material is not limited in this carbonization step, and it refers to a step of firing the bamboo material at a temperature of 600 ° C. or higher.

  The bamboo fiber content is preferably 5% by weight or more and 70% by weight or less. If this is less than 5% by weight, the effect of increasing the rigidity by bamboo fibers is small. On the other hand, if it exceeds 70% by weight, the fluidity decreases and injection molding becomes difficult, so the degree of freedom in shape becomes small. When the bamboo fiber content exceeds 50% by weight, it is desirable to use bamboo powder, bamboo charcoal, or both to make the bamboo fiber content 70% by weight or less. This is because it is difficult to uniformly disperse 50% by weight or more of the resin with bamboo fibers having a fiber length of 0.5 mm to 3 mm, and the fluidity is extremely lowered. This is because using bamboo charcoal together and increasing the bamboo component enables higher rigidity.

  Moreover, since the polylactic acid resin has a large specific gravity, it may be lightened by mixing an olefin resin. Among them, it is desirable to use polypropylene for the olefin resin. Since polypropylene has a small specific gravity and high fluidity, not only weight reduction but also injection molding becomes easy. In addition, since the heat-resistant temperature is relatively low and relatively high, a highly reliable dust cap 30 can be obtained.

  In order to adjust the sound quality by reinforcing the dust cap 30, adding some accents to the sound, or giving the sound pressure frequency characteristics a peak, a reinforcing material may be mixed. Mica and talc can be used as such a reinforcing material.

  In particular, it is desirable to use mica when it is desired to improve the high frequency reproduction band. Further, in order to improve the sound quality by suppressing the resonance peak, talc may be used to increase the internal loss of the dust cap.

  As described above, the present invention achieves higher sound quality, higher output, and higher reliability by configuring a dust cap by injection molding a material in which at least polylactic acid resin and bamboo fiber are mixed. Can be planned.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the eleventh aspect of the present invention.

  FIG. 2 shows a cross-sectional view of a speaker according to an embodiment of the present invention.

  As shown in FIG. 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute an internal magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the diaphragm 27 is bonded to the peripheral edge of the frame 26 via an edge 29.

  One end of the voice coil 28 is coupled to the center portion of the diaphragm 27 and the other end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  The dust cap 30 according to any one of claims 1 to 10 is adhered to the front surface of the diaphragm 27.

  In the above, the speaker having the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this, and may be applied to a speaker having an outer magnet type magnetic circuit.

  With this configuration, as described in the first embodiment, by configuring the speaker using a dust cap having sufficient rigidity and toughness, the sound pressure level in the high sound range can be improved, and the high sound range can be improved. You can get a clear and powerful sound quality.

  Even in the low sound range, it is possible to reproduce a deep bass sound with good tightening.

  As a whole, it is possible to obtain excellent sound quality with high clarity and good sound image localization with a clear outline.

  Furthermore, it is possible to realize a timbre with reduced feeling of distortion.

(Embodiment 3)
The invention according to claim 12 of the present invention will be described below with reference to the third embodiment.

  FIG. 3 is an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.

  As shown in FIG. 3, the speaker 31 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 that is an amplifying means for an electric signal input to the speaker, and a source input to the amplifier 42 And an audio mini component system 44 that is an electronic device.

  With this configuration, it is possible to improve the sound pressure level in the high sound range that could not be realized in the past, and to realize a minicomponent system that obtains clear and powerful sound quality in the high sound range.

  Furthermore, it is possible to improve the input reliability and various reliability typified by moisture resistance reliability. Also, the speaker is beautiful in appearance, hardly discolored, and can maintain a stable appearance for a long time. A system can be realized.

  Therefore, it can be set as the minicomponent system excellent also in terms of quality and reliability.

  In addition, although the audio | voice minicomponent system 44 was demonstrated as an application to the apparatus of the speaker 31, it is not limited to this. It can also be applied to portable audio devices that can be carried and charging systems. Furthermore, it can be widely applied and deployed in video equipment such as liquid crystal televisions and plasma display televisions, information communication equipment such as mobile phones, and electronic equipment such as computer-related equipment.

(Embodiment 4)
Hereinafter, the fourth aspect of the present invention will be described with reference to the fourth embodiment.

  FIG. 4 shows a cross-sectional view of an automobile 50 which is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 4, an automobile 50 is configured by incorporating the speaker 31 of the present invention into a rear tray or a front panel and using it as a part of car navigation or car audio.

  By adopting this configuration, it is possible to improve the sound quality of a device such as an automobile on which the speaker 31 is mounted by creating a highly accurate characteristic, sound making, and design utilizing the features of the speaker 31.

  A dust cap for a speaker, a speaker, an electronic device, and an apparatus according to the present invention are improved in sound quality and have high-accuracy characteristics, electronic devices such as audiovisual equipment and information communication equipment that require sound creation, and devices such as automobiles. Applicable to.

Sectional drawing of the dust cap for speakers in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention 1 is an external view of an electronic device according to an embodiment of the present invention. Sectional drawing of the apparatus in one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil 29 Edge 30 Dust cap 31 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 50 Automobile

Claims (13)

A speaker dust cap formed by injection molding a material mixed with at least a plant-derived polylactic acid resin and bamboo fiber. The dust cap for a speaker according to claim 1, wherein the bamboo fiber has a fiber length of 0.5 mm to 3 mm. The speaker dust cap according to claim 1, wherein the bamboo fiber has a fiber diameter of 10 μm or less. The dust cap for a speaker according to claim 1, wherein the bamboo fiber contains bamboo powder. The dust cap for a speaker according to claim 1, wherein the bamboo fiber includes a carbonized bamboo material. The dust cap for a speaker according to claim 1, wherein a mixing ratio of the bamboo fiber is 5 wt% or more and 70 wt% or less. The speaker dust cap according to claim 1, further comprising an olefin resin. The speaker dust cap according to claim 7, wherein the olefin resin is polypropylene. The speaker dust cap according to claim 1, further comprising a reinforcing material. The speaker dust cap according to claim 9, wherein the reinforcing material is at least one of mica and talc. A frame coupled to a magnetic circuit; a diaphragm coupled to an outer periphery of the frame; a voice coil coupled to the diaphragm and a part of which is disposed in a magnetic gap of the magnetic circuit; A speaker comprising the dust cap for a speaker according to claim 1, which is coupled to the front surface of the diaphragm. An electronic device comprising the speaker according to claim 11 and at least an amplifier circuit for an input signal to the speaker. An apparatus comprising the speaker according to claim 11 mounted on a moving means.

Images