JP5548943B2 - DUST CAP FOR SPEAKER, SPEAKER USING THE SAME, AND ELECTRONIC DEVICE AND DEVICE USING THE SPEAKER - Google Patents

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.

  In recent years, with the spread of digital technology in electronic devices such as audio equipment and video equipment, there has been a strong demand for improved performance of speakers used in these electronic devices.

  Among them, the performance of the dust cap affects the high-frequency reproduction of the speaker, and a dust cap that is lightweight and highly rigid is required.

  On the other hand, there is a strong demand from the market for demands that hinder high performance, such as lower prices and environmental compatibility.

  Therefore, in the future, it will be indispensable to develop a speaker dust cap that has high sound quality, high performance, and excellent price reduction and environmental friendliness.

  As a material for conventional dust caps for speakers, a material obtained by beating softwood is the mainstream.

  There are also those using carbon fiber, glass fiber, polyester fiber, aramid fiber or the like as a reinforcing agent.

  Dust caps produced through these papermaking processes have the problem of low productivity and large variation.

  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.

  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 inventions of these applications.

JP-A-3-289298

  Conventional dust caps were intended to prevent dust from entering the magnetic gap, but in recent years, in order to fulfill the role of increasing the bandwidth of speakers due to the development of audio and video equipment, There is a need for lightweight and highly rigid materials.

  In general, a resin dust cap is formed by injection molding of a polypropylene resin, thereby obtaining a dust cap having 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. .

  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 solve the above problems, the present invention provides a speaker dust cap obtained by injection molding or sheet molding containing a resin and plant opal, wherein the plant opal is extracted from bamboo leaves, and the plant opal The content is 5% by weight or more and 30% by weight or less.

  By adopting this configuration, the rigidity and sound speed of the speaker dust cap can be improved by mixing plant opal contained in bamboo leaves into the resin.

As described above, the present invention includes a resin and plant opal, and in a speaker dust cap obtained by injection molding or sheet molding , plant opal is extracted from bamboo leaves, and the content of plant opal is 5 wt% or more and 30 wt% or less improves the rigidity, toughness, sound speed, and Young's modulus of the dust cap, and improves sound quality such as high clarity reproduction of speakers using this dust cap. Planning, large output, and high reliability.

  Furthermore, it is possible to provide a dust cap for a speaker with a low environmental load with high productivity and at a low price.

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

  Embodiments of the present invention will be described below.

(Embodiment 1)
Hereinafter, it will be explained in 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 formed by injection molding a material mixed with resin and plant opal extracted from bamboo leaves.

  Although the dust cap formed by injection molding has been described, the present invention is not limited thereto, and sheet molding may be used.

  The method for extracting the plant opal from the bamboo leaves is not particularly limited, but a method of drying the bamboo leaves to remove moisture, powdering with a mixer, and classifying with a sieve is the best in yield.

  In addition, there are various methods such as pulverizing under pressure and dividing into powder that settles on the aqueous solution due to the difference in specific gravity and powder that floats on water. Plant opal may be extracted from bamboo leaves by any method.

  The plant opal extracted from the bamboo leaves has a function of improving the flexural modulus, thereby improving the rigidity and sound speed of the diaphragm, reducing distortion, and expanding the reproduction band.

  Furthermore, when natural fibers are mixed, a natural and bright tone can be reproduced, and dark and uniform tone unique to the resin can be suppressed.

  The natural fiber may be wood pulp or non-wood pulp, but it is desirable to mix bamboo fiber which is non-wood.

  Bamboo fibers have a higher modulus of elasticity than other pulp materials, so that the degree of freedom in adjusting physical properties is increased, for example, the speed of sound can be improved.

  The use of bamboo fiber also saves resources even when considering the extraction of plant opal from bamboo leaves, and is friendly to the environment because bamboo grows faster than wood.

  The plant opal extracted from the mixed bamboo leaves is preferably 5% by weight or more and 30% by weight or less.

  When the mixing ratio of plant opal extracted from bamboo leaves is less than 5% by weight, the effect of improving the sound speed is small.

  On the other hand, when it exceeds 30% by weight, sheet molding and injection molding become difficult, productivity and dimensional stability are lowered, and the degree of freedom of shape setting is reduced.

  Moreover, the bamboo fiber mixed tends to brighten the sound quality. In particular, when the mixed amount exceeds 51% by weight, unlike the resin, it can be incinerated and discarded like bamboo fiber.

  Further, some of the bamboo fibers to be mixed may be bamboo fibers that have been refined to a microfibril state with a beating degree of 25 cc or less.

  The bamboo fiber itself that has been refined to the microfibril state has a higher elastic modulus than the normal bamboo fiber, and the presence of the bamboo fiber that has been partially refined to the microfibril state provides a stronger bond between the fibers. These effects synergistically increase the elastic modulus compared to bamboo fiber alone, thereby improving the speed of sound.

  Moreover, when it is desired to increase the bamboo fiber to make a more natural and bright tone, bamboo powder may be used for a part or all of the bamboo fiber.

  Furthermore, by making some or all of the bamboo fibers into a bamboo charcoal state, the elastic modulus and internal loss can be improved, and the performance as a dust cap can be further improved.

  Further, although a colorant such as a pigment may be mixed, if a carbonized bamboo fiber is used, it is not necessary to mix a black colorant.

  Further, when it is desired 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.

  As such a reinforcing material, mica, graphite, talc, calcium carbonate, clay, carbon fiber, and aramid fiber can be used.

  If mica is mixed in the reinforcing material, the elastic modulus can be increased.

  When graphite is mixed, the elastic modulus and internal loss can be increased.

  When talc, calcium carbonate, and clay are mixed, internal loss can be increased.

  When an aramid fiber is used, the bamboo fiber and the aramid fiber are entangled and the internal loss can be increased without lowering the elastic modulus.

  Further, when an aramid fiber refined to a microfibril state is used, the entanglement between the fibers becomes stronger, so that a high elastic modulus and a high internal loss are possible.

  Further, by using a compatibilizing agent, it becomes possible to improve the elastic modulus and heat resistance by improving the compatibility of non-polar resin such as polypropylene and plant opal extracted from bamboo leaves.

  In particular, it is desirable to use a silane having a vinyl group, a methacryloxy group, or a mercapto group as the compatibilizing agent.

  Specifically, vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane , 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane and the like.

  Further, the compatibilizing agent is not limited to this, and it goes without saying that other silane coupling agents and nonpolar resins may be modified with maleic anhydride to have polarity.

  For the dust cap 30, it is desirable to use polypropylene as the resin.

  Polypropylene is crystalline and has relatively high heat resistance and good moldability.

  Moreover, since the resin has a small specific gravity, it is effective for reducing the weight of the diaphragm.

  Also, using polymethylpentene with an olefin resin other than polypropylene is effective for reducing the weight.

  In addition, by appropriately using a crystalline resin and an amorphous resin according to applications, it is possible to satisfy the optimum physical property values as a resin material.

  In addition, plant-derived resins represented by polylactic acid may be used for engineering plastics and environmental considerations.

  By combining these materials, the physical property values of the diaphragm 27 can be freely adjusted with high accuracy, and predetermined characteristics and sound quality can be realized.

  As described above, according to the present invention, a dust cap for a speaker is formed by injection molding or sheet molding a material mixed with resin and plant opal extracted from bamboo leaves. In addition, the sound speed and Young's modulus can be improved, the sound quality can be improved, such as the high intelligibility reproduction of the speaker, and the output can be increased and the reliability can be improved.

  Furthermore, it is possible to provide a dust cap for a speaker with a low environmental load with high productivity and at a low price.

(Embodiment 2)
Hereinafter, it will be explained in the second embodiment.

  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 central portion of the diaphragm 27 and the opposite 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 15 is coupled 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.

  As described above, a speaker dust cap is formed by injection molding or sheet molding of a material mixed with resin and plant opal extracted from bamboo leaves. The sound pressure level can be improved, and the sound quality can be improved, such as obtaining a clear and powerful sound quality in the high sound range, so that the output can be increased and the reliability can be improved.

  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. Can be realized.

  The effect of the dust cap tends to appear as a greater effect as the outer size of the dust cap increases.

(Embodiment 3)
Hereinafter, it will be explained in 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.

  The speaker 31 is incorporated in the enclosure 41 to constitute a speaker system.

  The amplifier 42 includes an amplification circuit for an electric signal input to the speaker system.

  An operation unit 43 such as a player outputs a source input to the amplifier 42.

  As described above, the audio mini-component system 44, which is an electronic device, includes the amplifier 42, the operation unit 43, and the speaker system.

  The amplifier 42, the operation unit 43, and the enclosure 41 are main body units of the mini component system 44.

  That is, the speaker 31 is attached to the main body of the mini component system 44.

  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.

  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, it will be explained in 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 pressure level in the high sound range that could not be realized by utilizing the features of the speaker 31, and to obtain a device such as an automobile that obtains clear and powerful sound quality in the high sound range. Can be realized.

  In addition, the speaker can be improved in input resistance and various reliability typified by moisture resistance reliability. Also, it is beautiful in appearance, hardly discolored, and can maintain a stable appearance for a long time. A device such as an automobile can be realized.

  A dust cap for a speaker, a speaker, an electronic device, and an apparatus according to the present invention are electronic devices such as an audiovisual device and an information communication device that are required to produce sound with high sound quality such as high clarity reproduction of the speaker. Furthermore, the present invention can be applied to apparatuses such as automobiles.

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 Operation part 44 Mini component system 50 Automobile

Claims (14)

In a speaker dust cap obtained by injection molding or sheet molding , including resin and plant opal , the plant opal is extracted from bamboo leaves, and the content of the plant opal is 5% by weight or more, A speaker dust cap of 30% by weight or less . The speaker dust cap according to claim 1, further comprising natural fibers. 3. The speaker dust cap according to claim 2, wherein the natural fiber is bamboo fiber. 4. The dust cap for a speaker according to claim 3 , wherein a part of the bamboo fiber is a bamboo fiber that is refined to a microfibril state with a beating degree of 25 cc or less. The dust cap for a speaker according to claim 3 , wherein a part or all of the bamboo fiber is bamboo powder. The speaker dust cap according to claim 3 , wherein a part or all of the bamboo fiber is carbonized bamboo charcoal. The speaker dust cap according to claim 1, further comprising a reinforcing material. The speaker dust cap according to claim 1, further comprising a compatibilizing agent. The speaker dust cap according to claim 1, wherein the resin is polypropylene. The speaker dust cap according to claim 1, wherein the resin is a plant-derived resin. The speaker dust cap according to claim 10, wherein the plant-derived resin is polylactic acid. 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 12 and at least an amplifier circuit for an input signal to the speaker. An apparatus comprising the speaker according to claim 12 as a moving means.

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