JP5548939B2 - Speaker diaphragm, speaker using the same, and electronic device and apparatus using the speaker - Google Patents

Description

  The present invention relates to a speaker diaphragm used in various audio equipment and video equipment, and to electronic equipment and devices such as a speaker, a stereo set, and a television set using the diaphragm.

  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.

  On the other hand, among speaker components, the performance of the diaphragm occupies a large weight in determining the sound quality, and it is an urgent need to develop a high-performance diaphragm that achieves better sound quality.

  A conventional method for manufacturing a speaker diaphragm will be described with reference to the drawings.

  FIG. 6 is a cross-sectional view of a resin speaker diaphragm made by conventional injection molding.

  As shown in FIG. 6, the speaker diaphragm 7 was obtained by using resin such as polypropylene and injection-molding resin pellets in a pre-set mold.

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

  In addition, for the purpose of adjusting physical property values as a diaphragm, that is, adjusting characteristics and sound quality as a speaker, there is a blend type using different types of resins.

  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.

  Further, in order to further increase the degree of freedom in adjusting the physical properties, the sound quality is adjusted by mixing pulp material.

  As prior art document information relating to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.

Japanese Patent Application Laid-Open No. 59-17695 JP 2005-236497 A

  With respect to recent audio equipment and video equipment, as well as devices such as automobiles equipped with these equipment, performance has been dramatically improved as compared with the past due to significant advances in digital technology.

  With regard to its sound quality, the realism has been further improved with lower distortion, wider bandwidth, and higher dynamic range, and video performance has been improved dramatically due to the appearance and popularization of large modules such as high definition and plasma displays. .

  Therefore, due to the improvement in performance of the electronic devices described above, there is a strong demand from the market to improve the performance of speakers used in these electronic devices.

  On the other hand, for a speaker whose performance is strongly demanded by the market, it is indispensable to improve the performance of a diaphragm that occupies a large weight that determines the sound quality among the components of the speaker.

  However, with resin diaphragms, moisture resistance reliability and strength can be secured, appearance can be improved, productivity can be improved, but only uniform physical properties specific to the resin, which is the fate of the resin, can be secured. There is a drawback that the adjustment range of the characteristics and sound quality as a speaker is very narrow.

  In addition, a diaphragm mixed with resin and pulp material provides greater freedom of sound quality adjustment and ensures moisture resistance reliability.In addition, it is necessary to increase the strength in order to improve physical properties and improve sound quality. there were.

  The present invention solves the above-described problems, and provides a speaker diaphragm that has a large degree of freedom in adjusting characteristics and sound quality as a speaker, can ensure moisture resistance reliability and strength, has an excellent appearance, and can improve productivity. It is intended to provide.

To achieve the above object, the present invention is seen containing a resin and a plant opal, the loudspeaker diaphragm by injection molding or sheet forming, phytolith is extracted from bamboo leaves, and the content of phytolith The amount is 5% by weight or more and 50% by weight or less.

  With this configuration, plant opal contained in bamboo leaves is mixed into the resin to improve the rigidity and sound speed of the resin diaphragm, reduce the expansion and distortion of the speaker's playback band, and achieve good sound quality. can do.

The present invention, as described above, viewed contains a resin and plant opal, in injection molding or sheet forming to a speaker diaphragm, phytolith is extracted from bamboo leaves, and the content of plant opal, 5 wt% or more, which was 50 wt% or less, this configuration, moisture is also a feature of the tree butter diaphragm, while maintaining the water reliability, excellent flexibility is increased appearance properties settings of the diaphragm A diaphragm can be obtained.

  Further, by obtaining the diaphragm by injection molding or sheet molding, a diaphragm having improved productivity and dimensional stability can be obtained.

  And the rigidity and sound speed of the resin diaphragm can be improved, the expansion and distortion of the reproduction band of the speaker can be reduced, and good sound quality can be realized.

  In addition, these resins, as well as reinforcing materials that are mixed materials, are selected from a wide range of materials, and by appropriately setting the blending ratio, it is possible to achieve highly accurate characteristics and sound quality that were previously impossible. Can be adjusted.

  Furthermore, a wide variety of designs are possible depending on the combination of colors and other designs.

  And there is a possibility that the variation by the combination can be set infinitely, and the desired requirements can be satisfied in the characteristic creation, sound creation and design.

Sectional drawing of the diaphragm for speakers in one embodiment of this invention The top view of the diaphragm for speakers in one embodiment of the present 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 Sectional view of a conventional speaker diaphragm

  Hereinafter, although an embodiment of the present invention is described, this embodiment does not limit the present invention at all.

(Embodiment 1)
Hereinafter, it will be explained in the first embodiment.

  FIG. 1 is a sectional view of a diaphragm according to an embodiment of the present invention, and FIG. 2 is a plan view of the diaphragm according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the diaphragm 27 is formed by injection molding or sheet molding of a material mixed with resin 27A and plant opal 27B extracted from bamboo leaves.

  The method of extracting plant opal (silicon dioxide compound) from bamboo leaves is not particularly limited, but the best method is to dry bamboo leaves to remove moisture, powder them with a mixer, and classify them with a sieve. ,desirable.

  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.

  Moreover, although the above demonstrated the plant opal extracted from the bamboo leaf, the same effect can be acquired even if the plant opal extracted from the bamboo leaf is used.

  By mixing the plant opal contained in this bamboo leaf in an amount of 5 wt% or more and 50 wt% or less, performance can be effectively exhibited.

  When the plant opal contained in the bamboo leaves is less than 5% by weight, the function of improving the flexural modulus is small and not effective.

  On the other hand, if the plant opal contained in the bamboo leaves exceeds 50% by weight, it becomes difficult to uniformly disperse the resin in the resin, and thinness molding by injection molding becomes difficult due to a decrease in fluidity.

  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 fiber has a higher elastic modulus than other pulp materials, so the degree of freedom in adjusting physical properties such as higher sound speed is increased.

  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 bamboo fiber to be mixed is preferably 5% by weight or more and 60% by weight or less.

  By setting it as this blending ratio range, the effect when kneading resin 27A and plant opal 27B extracted from bamboo leaves is efficiently exhibited, and productivity and quality are improved.

  When the mixing ratio of bamboo fiber is less than 5% by weight, the effect of bamboo fiber hardly appears.

  On the other hand, if it exceeds 60% by weight, it takes a long time to knead with the resin 27A.

  Further, since injection molding becomes difficult, productivity and dimensional stability are reduced, and the degree of freedom in shape is reduced.

  Among them, when the mixing amount of bamboo fiber exceeds 51% by weight, unlike 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.

  It is said that the bamboo fiber itself refined to the microfibril state has a higher elastic modulus than the normal bamboo fiber and the presence of the bamboo fiber partially refined to the microfibril state strengthens the bond between the fibers. There is also an effect, and since these synergistically increase the elastic modulus compared to bamboo fiber, the speed of sound is improved.

  In addition, 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 diaphragm can be further improved.

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

  Furthermore, in order to adjust the sound quality by reinforcing the diaphragm 27, 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.

  When mica is mixed into 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, not only aramid fibers but also high strength and high elastic modulus fibers such as carbon fibers may be used as chemical fibers.

  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 diaphragm 27, it is desirable to use polypropylene for the resin 27A.

  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.

  In order to realize the predetermined characteristics and sound quality, deep know-how regarding characteristics creation and sound creation is necessary, but in general, it is often performed by the following method.

  That is, the speaker characteristics and sound can be changed to some extent by changing the parameters of the components, and can be brought close to predetermined characteristics and sound quality.

  For example, a case is assumed in which the parameters of the components other than the diaphragm 27 among the components of the speaker are fixed.

  The parameters that can be changed in the diaphragm 27 are the area, shape, weight, surface thickness, etc. other than the physical property values.

  However, the area, shape, weight, and surface thickness of the diaphragm 27 are almost determined at the initial stage of speaker design.

  That is, the sound pressure frequency characteristic and sound quality of the speaker are roughly determined by conditions other than the physical property values of the diaphragm 27.

  In this case, unnecessary peaks and dips occur in the sound pressure frequency characteristics, and distortion often occurs greatly in a specific frequency band.

  As for the sound quality, the timbre greatly depends on the sound pressure frequency characteristic.

  These causes are caused by the area, shape, weight, and surface thickness of the diaphragm 27, and in particular, are often due to the vibration mode of the diaphragm 27.

  When selecting a diaphragm material in order to improve such unnecessary peaks, dips and distortions and obtain good sound quality, the following procedure can be followed.

  First, a material that seems to satisfy the sound pressure frequency characteristics, sound quality, and reliability grade required for the speaker is selected as resin 27A, plant opal 27B extracted from bamboo leaves, and other mixed materials. To do.

  In this case, the resin 27A serving as the base is selected with particular emphasis on reliability such as its heat resistance grade, and a material in which the unique tone color of each resin 27A is close to a predetermined tone color is selected.

  And each material is selected about the unnecessary peak and dip on the sound pressure frequency characteristic to delete.

  For countermeasures against dip, a resin material having resonance at that frequency is selected. Conversely, for countermeasures against peaks, a material having internal loss at that frequency is selected.

  Regarding the selection of this material, the resin 27A, the plant opal 27B extracted from bamboo leaves, and other mixed materials have a density, elastic modulus, internal loss, tone, and resonance frequency when molded into the shape of the diaphragm 27. Select with consideration of the above.

  Then, the selected material is kneaded to produce a master batch pellet highly filled with plant opal 27B extracted from bamboo leaves for injection molding.

  Next, using this master batch pellet, the diaphragm 27 is obtained by injection molding.

  The physical property values and the like of the diaphragm 27 obtained in this way are measured and evaluated.

  Further, a speaker is prototyped using the diaphragm 27, the characteristics and sound quality are actually measured, and further audition is performed for final evaluation.

  If the predetermined characteristics and sound quality cannot be obtained by the evaluation, this prototype process is repeated many times.

  And in that, we will improve the selection of materials and their blending ratio, and will gradually approach the target characteristics and sound quality.

  By repeating the process as described above, the predetermined characteristics and sound quality can be satisfied, or a very close diaphragm 27 can be finished.

  Polypropylene is generally easily available and injection molding is easy, but the present invention is not limited to this resin material and can be used properly according to the desired characteristic value.

  For example, when high heat resistance and high solvent resistance are required, it is possible to use an engineering plastic suitable for the application.

  Moreover, it is also possible to use plant origin resin, especially polylactic acid for environmental consideration.

  Polylactic acid has relatively better compatibility with bamboo materials than polypropylene, and the compatibility is further improved by using tannin or the like as a compatibilizing agent.

  As described above, according to the present invention, the material for mixing the resin and the plant opal extracted from bamboo leaves is molded by injection molding or sheet molding to configure the diaphragm for the speaker. To obtain a diaphragm capable of ensuring high internal loss and moisture resistance reliability of the resin, excellent appearance, and improved productivity and dimensional stability while taking advantage of the high elastic modulus that is characteristic of bamboo fiber. Can do.

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

  FIG. 3 shows a cross-sectional view of a speaker according to an embodiment of the present invention.

  As shown in FIG. 3, 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 any one of the diaphragms 27 according to claims 1 to 16 is bonded to the peripheral portion 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.

  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, according to the present invention, by using a speaker diaphragm in which a material mixed with resin and plant opal extracted from bamboo leaves is injection-molded or sheet-molded, the degree of freedom in setting the physical properties of the diaphragm is increased. A loudspeaker that uses a diaphragm that ensures high internal loss and moisture resistance reliability, has excellent appearance, and improves productivity and dimensional stability, while taking advantage of the high elastic modulus that is characteristic of bamboo fiber. Can be obtained.

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

  FIG. 4 is an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.

  The speaker 30 is incorporated in an 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 30 is attached to the main body of the mini component system 44.

  The voice coil 28 of the speaker 30 is supplied with power from the amplifier 42 of the main body and emits sound from the diaphragm.

  With this configuration, it is possible to obtain a mini component system 44 that enables highly accurate characteristic creation, sound creation, and design that could not be realized in the past.

  In addition, although the audio | voice minicomponent system 44 was demonstrated as an application to the apparatus of the speaker 30, it is not limited to this.

  It can also be applied to portable portable audio equipment.

  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. 5 shows a cross-sectional view of an automobile 50 that is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 5, an automobile 50 is configured by incorporating the speaker 30 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 degree of freedom in acoustic design of a device such as an automobile on which the speaker 30 is mounted by making high-precision characteristics, making sound, and designing using the characteristics of the speaker 30. .

  The speaker diaphragm, the speaker, the electronic device, and the device according to the present invention can be applied to an electronic device such as an audiovisual device or an information communication device that requires highly accurate characteristics and sound creation, and further to a device such as an automobile.

21 Magnet 22 Upper Plate 23 Yoke 24 Magnetic Circuit 25 Magnetic Gap 26 Frame 27 Diaphragm 27A Resin 27B Plant Opal Extracted from Bamboo Leaves 28 Voice Coil 29 Edge 30 Speaker 41 Enclosure 42 Amplifier 43 Operation Unit 44 Mini Component System 50 Automobile

Claims (14)

And tree fat include plant opal, the speaker diaphragm injection molded or sheet molding, the phytolith is extracted from bamboo leaves, and the content of the plant opal, 5 wt% or more, 50 A loudspeaker diaphragm that is not more than% by weight . The speaker diaphragm according to claim 1, further comprising natural fibers. 3. The loudspeaker diaphragm according to claim 2, wherein the natural fiber is bamboo fiber. 4. The speaker diaphragm according to claim 3, wherein the bamboo fiber is 5% by weight or more and 60% by weight or less. 4. The loudspeaker diaphragm according to claim 3, wherein part or all of the bamboo fiber is bamboo powder. 4. The speaker diaphragm according to claim 3, wherein bamboo charcoal obtained by carbonizing a part or all of the bamboo fiber is used. The speaker diaphragm according to claim 1, further comprising a reinforcing material. The speaker diaphragm according to claim 1, further comprising a compatibilizing agent. The speaker diaphragm according to claim 1 , wherein the resin is one of polypropylene and engineering plastic . The speaker diaphragm according to claim 1, wherein the resin is a plant-derived resin. The speaker diaphragm according to claim 10, wherein the plant-derived resin is polylactic acid. A magnetic circuit, a frame coupled to the magnetic circuit, the diaphragm according to claim 1, and the diaphragm are coupled to the diaphragm, and a part of the diaphragm is disposed within an operating range of a magnetic flux generated from the magnetic circuit. Speaker with a voice coil. The electronic device provided with the main-body part and the speaker of Claim 1 electrically fed from the said main-body part. Device provided to the mobile device speaker of claim 1 wherein.

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