JP2005252775A - Speaker dust cap, speaker using the same, electronic equipment using the speaker, and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker dust cap with improved sound quality and adhesiveness to be used in sound equipment, with respect to a speaker, electronic equipment and a device. <P>SOLUTION: This speaker dust cap is formed by performing injection molding of material obtained by mixing at least resin material and pulp material to thereby have the large degree of freedom of sound quality improvement and physical property value setting, securing a paper advantage with satisfactory adhesiveness, moisture proof reliability and strength, which is excellent in outer appearance. The dust cap utilizes both characteristics of resin advantages which can improve productivity and dimensional stability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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.

  The prior art will be described with reference to FIG. FIG. 5 is a cross-sectional view of a conventional resin speaker dust cap by injection molding. As shown in FIG. 5, the speaker dust cap 9 was obtained by using resin such as polypropylene and injection-molding resin pellets in a mold set in a dust cap shape in advance.

  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.

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

  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 the sound quality, the realism has been further increased with lower distortion, wider bandwidth, and higher dynamic range, and remarkable performance improvements have been made along with higher reliability. 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 speakers whose performance is strongly demanded by the market, it is indispensable to improve the performance of dust caps that occupy a large weight that determines the sound quality among the components of the speakers.

  However, this dust cap has been produced by using a conventional pulp paper making method, a resin injection molding or pressing method, a cloth or metal pressing method, and the like. For this reason, these dust caps have been used properly according to their applications while taking advantage of their respective characteristics.However, each of these dust caps has its own drawbacks and does not meet the market requirements for the purpose of improving the performance described above. There wasn't.

  In other words, in paper, the physical property values can be set finely, and there is an advantage in that the characteristics as a speaker and the degree of freedom of sound quality adjustment are large, the internal loss is large, and the frequency characteristics can be flattened. It has the disadvantage of being inferior in reliability and strength. 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, moisture resistance, water resistance reliability and strength can be secured, 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. However, it has a drawback that the adjustment range of the characteristics and sound quality as a speaker is very narrow.

  The present invention solves the above-mentioned problems, and provides a speaker dust cap 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, it is to provide an excellent speaker dust cap that combines the good characteristics of paper and resin.

  In order to achieve the above object, according to the present invention, a dust cap for speakers is formed by injection molding a material in which at least a resin material and a pulp material are mixed. With this configuration, it is possible to obtain a dust cap that can make use of the characteristics of both the resin material and the pulp material.

  In other words, the frequency characteristics can be flattened due to large internal loss, the degree of freedom in setting the physical properties of the diaphragm is large, moisture resistance reliability and strength can be secured, the appearance is excellent, and productivity and adhesion are improved. A dust cap for a speaker can be obtained.

  As described above, in the present invention, a speaker dust cap is configured by injection molding a material in which at least a resin material and a pulp material are mixed. With this configuration, the frequency characteristics can be flattened due to large internal loss, and the advantages of the paper diaphragm with a high degree of freedom in setting the physical properties of the dust cap, moisture resistance, water resistance reliability and strength can be secured, and the appearance is excellent and production It is possible to obtain a dust cap that can make use of both the advantages of the resin that can improve the properties and dimensional stability. Therefore, it is possible to create characteristics and sounds that make use of the physical properties of both pulp, that is, paper and resin, which could not be realized conventionally.

  In addition, these pulp materials, resin materials, and reinforcing materials that are intermixing materials are selected from a wide range of materials, and by appropriately setting the blending ratio, it is possible to achieve high accuracy that was not possible in the past. The physical property value can be adjusted.

  Furthermore, a wide variety of designs are possible by combining the designs such as colors. A large number of variations based on the combination can be set, and desired characteristics can be satisfied in terms of characteristics, sounds, and design.

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

(Embodiment 1)
Hereinafter, the first to eleventh aspects of the present invention will be described using 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 29 is formed by injection molding a material in which a resin material 29A and a pulp material 29B are mixed. As for the material of the dust cap 29, a crystalline or amorphous olefin resin is used for the resin material 29A.

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

  This time, the case where the resin material 29A uses polypropylene is explained. 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.

  The pulp material 29B is mainly composed of kraft pulp, which is wood fiber, in combination with the base polypropylene resin material. Here, the wood fiber can reproduce a natural and bright tone, and can suppress a dark and uniform tone unique to the resin. In addition to kraft pulp, sulfite pulp or a mixed fiber of kraft pulp and sulfite pulp is combined as a main component, and the respective characteristics are utilized to make it closer to desired characteristics and sound quality.

  Furthermore, it is preferable to use any of leaf fibers, bast fibers, seed fibers, fruit fibers, stem fibers, or a combination thereof for the pulp material 29B. Further, the pulp material 29B may be mixed with materials such as 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 dust cap 29, and Manila hemp is often used. Further, bast fibers tend to improve the toughness strength of the dust cap 29, and cocoons, cocoons, ganpi, hemp, etc. are often used. In addition, the seed fiber tends to improve the internal loss of the dust cap 29, and cotton and linter are often used. Also, fruit fibers tend to improve the internal loss of the dust cap 29, and kapok is often used. Further, the stem fiber tends to improve the elastic modulus of the dust cap 29, and materials such as bamboo, cocoon, kenaf, and cocoon are often used.

  For the purpose of fine-tuning the sound quality that cannot be obtained with the above-mentioned plant fibers, the strength and internal loss can be fine-tuned by mixing animal fibers such as silk and wool.

  Furthermore, when reinforcing the dust cap 29, adding some accents to the sound, or adjusting the sound quality by giving a peak to the sound pressure frequency characteristics, metal fibers such as aluminum, carbon fibers such as carbon, It can also be configured by mixing ceramic fibers such as glass and boron, organic high-elasticity fibers such as aramid, and mica and graphite.

  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.

  And, by combining at least two of the aforementioned materials, ie, wood fiber, leaf fiber, bast fiber, seed fiber, fruit fiber, and stem fiber, the physical property value of the dust cap 29 can be freely set with high accuracy. The desired characteristics and sound quality can be realized.

  In addition to measuring and evaluating the physical properties of the dust cap obtained in this way, a prototype of the speaker was made using this dust cap. 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 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 pulp material of this invention is comprised as 0.2 mm-20 mm. With this configuration, it is possible to efficiently draw out the effects when kneaded with the resin material, and to improve productivity and quality. Here, when the fiber length of the pulp material is shorter than 0.2 mm, the effect of the pulp material cannot be obtained efficiently. On the other hand, when the length is longer than 20 mm, dispersibility is liable to occur due to secondary agglomeration caused by entanglement of fibers, so that a long kneading process with a resin material is required, or pulp fibers are scattered on the surface of the diaphragm. It causes productivity and quality problems such as going out and deteriorating appearance.

  Furthermore, the mixing ratio of the pulp material to the resin material of the present invention is set to 5% to 70%. With this configuration, it is possible to efficiently draw out the effects when kneaded with the resin material, and to improve productivity and quality. Here, when the mixing ratio of the pulp material is less than 5%, the effect of the pulp material hardly appears. On the other hand, when it exceeds 70%, defects of the pulp begin to appear, and the strength of the diaphragm is lowered, and the productivity and moisture resistance reliability, and further the dimensional stability is lowered.

  As described above, as a general effect, the dust cap 29 that receives and vibrates the amplitude from the normal vibration plate 27 has an unnecessary peak or dip generated by the divided resonance due to the effect of the pulp having a large internal loss. Can be reduced.

  And about resin with poor adhesiveness, adhesiveness can be improved according to the effect of a pulp.

  In addition, as a method of appearance design, the resin material 29A and the pulp material 29B may be different colors so that the design can appeal that both materials are mixed in one dust cap 29. In this case, it is particularly desirable to make the resin material transparent or translucent.

  As described above, according to the present invention, by forming the speaker dust cap 29 by injection molding a material in which the resin material 29A and the pulp material 29B are mixed, unnecessary peaks and dips generated due to divided resonance are reduced. It can be reduced by the effect of large pulp.

  In addition, the resin has a high degree of freedom in setting the physical properties of the dust cap 29, can secure the advantages of paper with excellent adhesion, moisture resistance, water resistance reliability and strength, has excellent appearance, and can improve productivity and dimensional stability. It is possible to obtain a dust cap that can take advantage of both of the advantages.

  Therefore, it is possible to create characteristics and sounds that make use of the physical properties of both paper and resin, which could not be realized in the past.

  Furthermore, in terms of the design, a wide variety of designs are possible depending on the color combinations of the pulp material and the resin material.

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

  FIG. 2 is 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 periphery of the frame 26. 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.

  A dust cap 29 according to any one of claims 1 to 11 is bonded to the opposite side of the central portion of the diaphragm 27 from the voice coil 28.

  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, unnecessary peaks and dips generated by split resonance can be reduced by the dust cap 29 due to the effect of pulp having a large internal loss.

  In addition, the degree of freedom of adjustment of 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, by using the dust cap 29 that takes advantage of the physical properties of both paper and resin that could not be realized in the past, it is possible to improve sound quality, create highly accurate characteristics, and create sound. Furthermore, a wide variety of designs are possible by combining the designs such as colors.

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

  Here, in the dust cap 29 described above, the weight that determines the characteristics and sound quality among the speaker components increases as the area, volume, and weight increase.

  Further, the dust cap 29 having an outer dimension close to the outer dimension of the diaphragm 27 due to the structure disposed and bonded to the front surface portion of the diaphragm 27 is larger than that of the diaphragm. The weight that determines the characteristics and sound quality can be large.

  This is a structure often found in super woofers and the like that physically cut high-frequency components and middle-high frequency components generated from the diaphragm by a dust cap.

  The reason for this is that although the dust cap vibrates due to the amplitude generated from the diaphragm and generates sound, the sound that directly reaches the human ear is more generated from the dust cap rather than the diaphragm. This is because.

  Therefore, the characteristics and sound quality greatly depend on the material and physical properties of the dust cap.

  In this case, the dust cap has the highest weight for determining the characteristics and sound quality among the speaker components.

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

  FIG. 3 shows 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 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 component system 44 that is an electronic device.

  By adopting this configuration, it is possible to realize electronic devices that can improve sound quality, create highly accurate characteristics, create sound, and design with a dust cap that takes advantage of the characteristics of both paper and resin that could not be realized in the past. be able to.

(Embodiment 4)
The fourth embodiment of the present invention will be described below with reference to the fourth embodiment.

  FIG. 4 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. 4, 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 dust cap that takes advantage of both the paper and resin characteristics of the speaker 30 improves the sound quality and creates high-accuracy characteristics, sound creation, and design. It is possible to improve the degree of freedom in acoustic design of the device.

  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 Cross section of a conventional dust cap

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 Dust cap 29A Resin material 29B Pulp material 30 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 50 Automobile

Claims (23)

A speaker dust cap formed by injection molding a material in which at least a resin material and a pulp material are mixed. The speaker dust cap according to claim 1, wherein the resin material is a crystalline or amorphous olefin resin. The speaker dust cap according to claim 1, wherein the resin material is polypropylene. The speaker dust cap according to claim 1, wherein the resin material is engineering plastic. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is wood fiber. 6. The dust cap for speakers according to claim 5, wherein the wood fiber is craft pulp, sulfite pulp, or a combination thereof. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is a leaf fiber. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is a bast fiber. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is seed fiber. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is fruit fiber. The speaker dust cap according to any one of claims 1 to 4, wherein the pulp material is a stem fiber. 2. The speaker dust cap according to claim 1, wherein the dust cap is configured by combining at least two of wood fiber, leaf fiber, bast fiber, seed fiber, fruit fiber, and stem fiber. The speaker dust cap according to claim 1 or 12, wherein animal fibers are mixed therein. The speaker dust cap according to claim 1 or 12, wherein a reinforcing material is mixed. The speaker dust cap according to any one of claims 1 to 14, wherein a fiber length of the pulp material is 0.2 mm to 20 mm. The dust cap for a speaker according to any one of claims 1 to 15, wherein a mixing ratio of the pulp material to the resin material is 5% to 70%. The speaker dust cap according to any one of claims 1 to 16, wherein a color of the diaphragm is a black color. The speaker dust cap according to any one of claims 1 to 17, wherein a color of the diaphragm is a natural color. The speaker dust cap according to any one of claims 1 to 18, wherein a color of the diaphragm is different between a resin material and a pulp material. The speaker dust cap according to claim 19, wherein a color of the diaphragm is a transparent or translucent resin material. 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; 21. A speaker obtained by coupling the dust cap according to any one of claims 1 to 20 to a side of the diaphragm opposite to the voice coil. An electronic apparatus comprising the speaker according to claim 21 and at least an amplifier circuit for an input signal to the speaker. The apparatus which mounted the speaker of Claim 21 in the moving means.

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