JP4442247B2 - 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.

  A conventional technique will be described with reference to FIG. 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.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
Japanese Patent Application Laid-Open No. 59-17695

  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, this vibration plate uses a conventional paper manufacturing method or a resin injection molding or press manufacturing method. Therefore, the paper vibration plate or the resin vibration plate has been mainly used. For this reason, these diaphragms have been used properly according to their applications while making use of their respective characteristics, but each has its own problems and has not met the aforementioned market requirements.

  That is, in the paper diaphragm, the physical property value of the diaphragm can be set finely, and there is an advantage that the degree of freedom in adjusting the characteristics and sound quality as a speaker is large, but it is inferior in moisture resistance reliability and strength, which are disadvantages peculiar to paper. Has drawbacks. In addition, the production has a disadvantage that it cannot be obtained unless a very large number of processes such as paper making are required.

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

  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.

  That is, an object of the present invention is to provide an excellent speaker diaphragm that combines the good characteristics of paper and resin.

In order to achieve the above object, the present invention has at least a polypropylene resin material and a material made of bamboo or cocoon having a fiber length of 0.2 mm to 20 mm, and a mixing ratio of the material made of bamboo or cocoon of 5 % To 70% , and this material is formed by injection molding, making it a dark and uniform characteristic of the resin, which is an advantage of materials made of bamboo or cocoons that have a large degree of freedom in setting the physical properties of the diaphragm. Suppresses timbre, reproduces natural and bright timbre, secures moisture resistance reliability and strength, which are the advantages of polypropylene resin material, improves appearance, productivity and dimensional stability, and frees physical properties of diaphragm, In addition, the speaker diaphragm is configured with high precision . With this configuration, it is possible to obtain a diaphragm that can make use of the characteristics of both a polypropylene resin material and a material made of bamboo or straw.

  That is, it is possible to obtain a loudspeaker diaphragm that has a large degree of freedom in setting the physical property values of the diaphragm, can ensure moisture resistance reliability and strength, has an excellent appearance, and can improve productivity.

As described above, the present invention includes at least a polypropylene resin material and a material made of bamboo or cocoon having a fiber length of 0.2 mm to 20 mm, and the mixing ratio of the material made of bamboo or cocoon is 5% to 70%. By mixing and molding this material, it is possible to suppress the dark and uniform tone unique to the resin, which is an advantage of the material made of bamboo or cocoon that has a large degree of freedom in setting the physical properties of the diaphragm, Reproduces natural and bright tone, secures moisture resistance reliability and strength, which are the advantages of polypropylene resin material, improves appearance, productivity and dimensional stability, and free and highly accurate physical properties of diaphragm Since the speaker diaphragm is adjusted, the advantages of the diaphragm made of bamboo or cocoon, which has a large degree of freedom in setting the physical property values of the diaphragm, moisture resistance reliability and strength can be ensured, and the appearance is excellent and production Low cost and dimensions Sex can also be obtained diaphragm can be utilized the features of both the advantages of polypropylene diaphragm can be improved. Therefore, it is possible to create characteristics and sounds that make use of the physical properties of both a diaphragm made of bamboo or straw and a polypropylene resin diaphragm, which could not be realized conventionally.

In addition, it is not possible in the past by selecting these materials made of bamboo or bamboo, polypropylene resin materials, and reinforcing materials that are intermixed materials from a wide variety of materials and setting the mixing ratio appropriately. Adjustment with high accuracy is possible.

  Furthermore, a wide variety of designs are possible depending on the combination of colors and other designs. In addition, there is a possibility that variations depending on the combination can be set indefinitely, and desired requirements can be satisfied in terms of creating characteristics, creating sounds, and designing.

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

(Embodiment 1)
Hereinafter, with reference to the first embodiment will be described with the present onset bright.

  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 a material in which a resin material 27A and a material 27B made of bamboo or bamboo are mixed. As for the material of the diaphragm 27, a crystalline or amorphous olefin resin is used for the resin material 27A.

  By using an olefin resin, moldability can be improved, and by using different crystalline and amorphous resin materials depending on the application, it is possible to satisfy the optimum physical properties as a resin material. It becomes possible.

  In this example, the resin material 27A will be described using polypropylene. Polypropylene is generally easily available and injection molding is easy, but the present invention is not limited to this resin material, and can be properly used 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.

  A pulp resin 27B is mainly combined with a pulp made of bamboo or straw as a pulp material 27B. Here, a natural and bright tone can be reproduced on the fiber made of bamboo or bamboo grass, and the dark and uniform tone unique to the resin can be suppressed. In addition to pulp made of bamboo or straw, sulphite pulp or mixed fibers of kraft pulp and sulphite pulp are combined as a main component, making use of the characteristics of each to bring it closer to the desired characteristics and sound quality. be able to.

  Further, the pulp material 27B may be mixed with materials such as leaf fibers, bast fibers, seed fibers, fruit fibers, stem fibers, and animal fibers. By mixing these materials, desired characteristics and sound quality can be brought closer to details or arbitrarily adjusted. Here, the leaf fibers tend to improve the strength of the diaphragm, and Manila hemp is often used. In addition, bast fibers tend to improve the toughness strength of the diaphragm, and cocoon, cocoon, ganpi, hemp, etc. are often used. Seed fibers tend to improve the internal loss of the diaphragm, and cotton and linter are often used. Also, fruit fibers tend to improve the internal loss of the diaphragm, and kapok is often used. In addition, stem fibers tend to improve the elastic modulus of the diaphragm, and materials such as kenaf and cocoon are often used. In addition, for the purpose of fine adjustment of sound quality that cannot be obtained with the above-mentioned plant fibers, it is possible to finely adjust strength and internal loss by mixing materials such as silk and wool which are animal fibers.

  In addition, if you want to adjust the sound quality by reinforcing the diaphragm, adding some accents to the sound, or having a peak in the sound pressure frequency characteristics, metal fibers such as aluminum, carbon fibers such as carbon, glass In addition, ceramic fibers such as boron and organic fibers, organic high-elasticity fibers such as aramid, and mica and graphite can also be mixed.

  In addition, when it is desired to ensure sound quality with an internal loss that cannot be satisfied by the above-described materials, a material such as zinc oxide whisker can be mixed.

  By combining each of the above materials, the physical property value of the diaphragm can be adjusted freely and with high accuracy, and desired characteristics and sound quality can be realized.

  For this desired characteristic and sound quality, deep know-how regarding the creation of physical properties and sound production is necessary, but in general, it is often implemented by the following means.

  With regard to making the characteristics of the speaker and making the sound, it is possible to change to some extent by changing the parameters of the component parts, and it is possible to approach the desired characteristics and sound quality. For example, when the parameters of other components other than the diaphragm are fixed, among the speaker components, the parameters that can be varied on the diaphragm include area, shape, weight, surface thickness, etc. There is. Therefore, considering the case where the area, shape, weight, and surface thickness of the diaphragm are fixed at a constant level, assuming that it is an approximate stage in speaker design, the sound pressure frequency of the speaker is used under conditions other than the physical properties of the diaphragm. Characteristics and sound quality are roughly determined. 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 attributed to the area, shape, weight, and surface thickness of the diaphragm, and particularly due to the vibration mode of the diaphragm.

  When the present invention is applied as means for selecting a diaphragm material for improving the above-described unnecessary peak dip and distortion and obtaining a good sound quality, the following results. First, a material considered to satisfy the sound pressure frequency characteristics, sound quality, and reliability grade required for the speaker is selected as a resin material, a material made of bamboo or bamboo, and other mixed materials. In this case, the resin material used as a base is selected with particular emphasis on reliability such as its heat resistance grade, and a material whose specific tone color of each resin material is close to a desired tone color is selected. Then, materials are selected for unnecessary peaks and dips on the sound pressure frequency characteristics to be deleted. In the case of countermeasures against dip, a material having resonance at that frequency is selected. On the other hand, in the case of countermeasures against peaking, a material having internal loss at that frequency is selected. This material selection takes into account the density, elastic modulus, internal loss, timbre, resonance frequency when molded into a diaphragm shape, etc. for resin materials, materials made of bamboo or bamboo, and other mixed materials. Select.

  Then, the above selected materials are kneaded to produce master batch pellets with a high pulp filling amount made of bamboo or straw for injection molding. Next, using the high batch filling masterbatch pellets made of bamboo or straw, the diaphragm of the present invention is obtained by injection molding.

  In addition to measuring and evaluating the physical properties of the diaphragm obtained in this way, a prototype of the speaker is manufactured using this diaphragm, and the final characteristics are measured and auditioned as the characteristics and sound quality of the actual speaker. Conduct a thorough evaluation.

  If the above-mentioned evaluation does not satisfy the desired characteristics and sound quality, this trial production process is repeated many times. Among them, not only the selection of materials but also their blending ratios will be improved to gradually approach the target characteristics and sound quality.

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

Moreover, the fiber length of the material which consists of bamboo of this invention or a bamboo basket is comprised as 0.2 mm-20 mm. With this configuration, the effects when kneaded with the polypropylene resin material can be pulled out efficiently, and the productivity and quality can be improved. Here, when the fiber length of the material made of bamboo or cocoon is shorter than 0.2 mm, the effect of the material made of bamboo or cocoon cannot be produced efficiently. On the other hand, when the length is longer than 20 mm, a dispersibility failure is likely to occur due to secondary aggregation resulting from the entanglement of the fibers. Therefore, a long kneading step with the polypropylene resin material is required, or pulp fibers are present on the surface of the diaphragm. It causes productivity and quality problems such as flying out and deteriorating appearance.

Further, the mixing ratio of the material made of bamboo or bamboo to the polypropylene resin material of the present invention is set to 5% to 70%. With this configuration, the effects when kneaded with the polypropylene resin material can be pulled out efficiently, and the productivity and quality can be improved. Here, when the mixing ratio of the material made of bamboo or cocoon is less than 5%, the effect of the material made of bamboo or hoe hardly appears. On the other hand, when it exceeds 70%, the defect of the material made of bamboo or straw starts to appear, and the strength of the diaphragm is lowered, and the productivity and moisture resistance reliability, and further the dimensional stability is lowered.

  If you want to make the diaphragm color black based on the external design, use a base material made of black bamboo or cocoon that is made of natural color bamboo or cocoon with a black dye. Kneading pigments from natural colors to produce black color resin pellets. Another method is to knead a material made of natural bamboo or cocoon and a resin material made of natural bamboo or cocoon to produce a masterbatch pellet with a high pulp filling quantity made of bamboo or cocoon. There is also a method of coloring by mixing black pigments. Thus, by making the color of the diaphragm black, it is possible to make a design that is the same as a conventional diaphragm.

  The above description is about the most commonly used black color, but is not limited to the black color, and all the colors can be handled by the above method. Furthermore, it is possible to use natural colors as they are without using colorants such as dyes and pigments, and to make the design based on colors that are closer to nature and excellent in environmental friendliness.

  Further, as another design method, it is possible to make a design that appeals that both materials are mixed in one diaphragm by using different colors for the material made of bamboo or bamboo and the resin material. In this case, it is particularly desirable to make the resin material transparent or translucent.

As described above, the present invention provides a loudspeaker diaphragm by injection molding a material in which a polypropylene resin material and a bamboo or cocoon material are mixed, whereby bamboo having a large degree of freedom in setting the physical property value of the diaphragm. Or a diaphragm that can take advantage of both the advantages of a diaphragm made of flaws and the advantages of a polypropylene resin diaphragm that can ensure moisture resistance reliability and strength, have excellent appearance, and improve productivity and dimensional stability. Obtainable.

Therefore, it is possible to create characteristics and sounds that make use of the physical properties of both a diaphragm made of bamboo or straw and a polypropylene resin diaphragm, which could not be realized conventionally. Furthermore, in terms of design, a wide variety of designs are possible depending on the color combinations of materials made of bamboo or bamboo and polypropylene resin materials.

(Embodiment 2)
Hereinafter, with reference to the second embodiment will be described with the present onset bright.

  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 7 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.

  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. Furthermore, the present invention can also be applied to a small speaker for a cellular phone in which the diaphragm 27 and the edge 29 are integrated.

  With this configuration, as described in the first embodiment, the degree of freedom in adjusting characteristics and sound quality is great, moisture resistance reliability and strength can be ensured, and a speaker with excellent appearance and high productivity can be realized. .

Therefore, it is possible to create highly accurate characteristics and sound making use of the physical properties of both a diaphragm made of bamboo or straw and a polypropylene resin diaphragm, which could not be realized conventionally. Furthermore, a wide variety of designs are possible depending on the combination of colors and other designs.

  Further, there is a possibility that variations depending on the combination can be set infinitely, and it is possible to realize a speaker that can satisfy desired requirements in terms of characteristics, sounds, and design.

(Embodiment 3)
Hereinafter, with reference to the third embodiment will be described with the present onset bright.

  FIG. 4 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. 4, the speaker 30 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 which is an amplifying means for an electric signal input to the speaker, and a source input to the amplifier 42 And an audio mini-comp system 44, which is an electronic device.

By adopting this configuration, we have realized an electronic device that enables highly accurate characteristics, sound creation, and design that take advantage of the features of both bamboo and bamboo diaphragms and polypropylene resin diaphragms that could not be achieved in the past. Can be made.

(Embodiment 4)
Hereinafter, with reference to the fourth embodiment will be described with the present onset bright.

  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, the speaker 30 is mounted by creating a characteristic with high accuracy, making a sound, and designing by making use of the characteristics of both the diaphragm made of bamboo or straw and the polypropylene resin diaphragm of the speaker 30. The degree of freedom in acoustic design of a device such as an automobile can be improved.

  The speaker diaphragm, the speaker, the electronic device, and the device according to the present invention can be applied to electronic devices such as audiovisual equipment and information communication devices that require high-precision characteristics and sound creation, and further to devices such as automobiles.

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

21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 27A Resin material 27B Pulp material 28 Voice coil 29 Edge 30 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 50 Automobile

Claims (10)

At least a polypropylene resin material, and a material fiber length of material comprises bamboo or bamboo and 0.2Mm～20mm, mixed with mixing ratio of the material comprising the bamboo or bamboo as from 5% to 70%, the material By configuring it by injection molding, it is possible to suppress the dark and uniform tone unique to the resin, which is an advantage of the material made of bamboo or cocoon, which has a large degree of freedom in setting the physical properties of the diaphragm, and reproduce a natural and bright tone In addition, the moisture resistance reliability and strength, which are the advantages of the polypropylene resin material, are secured, the appearance, productivity and dimensional stability are improved, and the physical properties of the diaphragm are adjusted freely and with high precision. A diaphragm for speakers. The speaker diaphragm according to claim 1, wherein animal fibers are mixed therein. The speaker diaphragm according to claim 1, wherein a reinforcing material is mixed. Color of the diaphragm, one of the speaker diaphragm of claim 3 according to claims 1 which is a black-colored. The diaphragm for a speaker according to any one of claims 1 to 3 , wherein a color of the diaphragm is a natural color. The diaphragm for a speaker according to any one of claims 1 to 5 , wherein a color of the diaphragm is different between a resin material and a material made of bamboo or straw. The diaphragm for a speaker according to claim 6 , wherein a color of the diaphragm is a resin material made transparent or translucent. A frame coupled to a magnetic circuit, a diaphragm according to any one of claims 1 to 7 coupled to an outer periphery of the frame, and a part of the diaphragm coupled to the diaphragm, the part of which is the magnetic A speaker composed of a voice coil arranged in a magnetic gap of a circuit. An electronic apparatus comprising the speaker according to claim 8 and at least an amplifier circuit for an input signal to the speaker. An apparatus in which the speaker according to claim 8 is mounted on a moving means.

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