JP2008160641A - Loudspeaker diaphragm, loudspeaker employing the diaphragm, and electronic equipment and device employing the loudspeaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loudspeaker diaphragm reinforcing piece which enhances the material rigidity of a diaphragm not only to provide a deep bass sound firm and clear in a low-pitched range and clear sound quality wherein resonance caused by a diaphragm rigidity deficiency characteristic of a high-pitched range is reduced, but also to provide a larger output and higher reliability. <P>SOLUTION: Rigidity as a diaphragm is improved in the loudspeaker diaphragm formed of paper containing a material having the reinforced intertwining of not fiber formed by making bamboo fiber, obtained from a bamboo which is ≥1 year old, small in the degree of material beating into a microfibril state and beating it, but microfiber grown in a feather shape from the surface of the beaten fiber between the beaten fiber and the microfiber grown in the feather shape from the surface of the beaten fiber. Consequently, the sound quality of a loudspeaker using the diaphragm can be improved and clearness articulation can also be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to speaker diaphragms used in various audio equipment and video equipment, speakers using the same, electronic equipment such as stereo sets and television sets, and devices such as automobiles.

  In the recent audio industry and the automobile industry equipped with audio equipment, the quality of sound reproduced from speakers has improved dramatically due to the widespread use of digital equipment.

  The trend for speakers in these industries is higher sound quality, lighter weight, and environmentally friendly.

  In order to realize the sound quality requirement that is the user's need in order to achieve high sound quality, it is urgent to develop a diaphragm that is a component of a loud speaker that determines the sound quality.

  The development of this diaphragm is proceeding mainly with the papermaking diaphragm because it has the advantage that the sound quality can be controlled with higher accuracy.

  The pulp used as a material for these papermaking diaphragms has conventionally used kraft pulp obtained from a coniferous tree through a beating process, and is in a state of spurring a lack of coniferous trees.

  Therefore, the use of environmentally friendly materials is indispensable in the future.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2000-324591 A

  Paper-making diaphragms, centered on paper diaphragms made of kraft pulp obtained from conifers, tend to be less rigid on the material than diaphragms made of metal or resin materials. It was what had.

  For this reason, it is difficult to improve the material rigidity of conventional paper diaphragms. Speakers using this diaphragm can reproduce high clarity, which is one of the improvements in sound quality, increase output, and have high reliability. It had a problem that it was disadvantageous for conversion.

  The present invention solves the above-mentioned problems, improves the material rigidity of the diaphragm, and only provides a clear sound quality with reduced resonance due to insufficient low-frequency diaphragm rigidity due to tightening in the low-frequency range. In addition, an object of the present invention is to provide a loudspeaker diaphragm that can achieve high output and high reliability.

  In order to achieve the above object, the present invention reduces the beating degree of bamboo fibers obtained from at least one year old bamboo to a microfibril state, and beats the fibers and the surface of the beaten fibers. The speaker diaphragm is made by making a paper containing a material that strengthens the entanglement of the fine fibers grown from the beaten fiber, rather than the beaten fibers, among the fine fibers grown from It is a thing.

  The reason why bamboo fiber is used here is that bamboo fiber can be easily reduced to a microfibril state and productivity can be improved as compared with other materials.

  By adopting this structure, bamboo fiber obtained from bamboo that has grown and grown for more than 1 year, and that has been stiff and tough, has reduced the beating degree to the microfibril state and strengthened the entanglement of the fiber. By making paper, the entanglement with other materials can be improved, and sufficient rigidity and toughness can be given as a speaker diaphragm.

  With the speaker diaphragm, the material rigidity of the diaphragm can be improved.

  As described above, the present invention reduces the beating degree of bamboo fiber obtained from bamboo that has been grown for 1 year or more to a microfibril state, and is obtained from the beaten fiber and the surface of the beaten fiber. Among the fine fibers grown in the shape of feathers, the speaker diaphragm was constructed by making a paper containing a material that strengthened the entanglement of the fine fibers grown in the shape of feathers from the surface of the beaten fibers rather than the beaten fibers. It only improves the rigidity, toughness, and Young's modulus of the diaphragm, and provides a clear sound quality that reduces resonance caused by the lack of diaphragm rigidity that is unique to the high-frequency range. In addition, it is possible to realize a loudspeaker diaphragm that can achieve high output and high reliability.

  Furthermore, the present invention can provide a papermaking diaphragm for a speaker that is inexpensive and friendly to the global environment.

  At present, the materials used for the papermaking diaphragm for speakers are mainly coniferous trees, which are spurring the shortage of coniferous trees in the world.

  On the other hand, because of its vigorous fertility and rapid growth, there are many kinds and quantities of bamboo in the world.

  Bamboo grows very fast compared to conifers, and those with a bamboo age of less than one year are poor in rigidity and lack toughness. , Have stable physical properties with toughness.

  Therefore, it has an advantage that the growth rate is an order of magnitude faster than that of conifers and can be used for food and the like as soon as it is born.

  In addition, it has the advantage that the original bamboo forest can be regenerated immediately after cutting, and it does not lead to a situation that adversely affects the global environment like cutting a coniferous forest.

  Rather, it would be desirable for the global environment to cut off bamboo forests that have increased too much to eliminate bamboo damage.

  Although these bamboos have been developed for a long time, their bamboo and younger ones that are less than one year old are often used for food and other purposes because of their softness and ease of processing. It was often used in the direction.

  However, because of the difficulty of processing due to its rigidity, it can only be found in some building materials and bamboo work, etc., because of the difficulty in processing due to its rigidity. Application development was urgent.

  As for the application to speaker papermaking diaphragm for speakers, although it has been tackled with bamboo and younger ones within the age of 1 year of bamboo because of the ease of defibration of bamboo fiber, it has been effective to some extent. It did not reach the center of the papermaking diaphragm for use.

  The reason for this is that in order to bring out the characteristics of the original bamboo fiber, it is more than 1 year old and more rigid than the soft and easy-to-process bamboo and younger ones. It is effective to use the grown bamboo fiber that has high strength and toughness, but it has been technically difficult to disentangle the grown bamboo fiber well, so it can fully utilize the features of the original bamboo fiber This is because the diaphragm could not be produced and the trending sound quality requirement could not be satisfied.

  However, the development of fibers that replace conifers has become an issue due to recent global environmental problems such as desertification due to the lack of conifers.

  As for papermaking technology, a new material beating technology has been developed, and it has become possible to form paper on a diaphragm that takes advantage of the features of materials that were previously considered difficult.

  Based on the above background, an embodiment of the present invention mainly composed of bamboo fibers that have been grown and grown for more than one year will be described below with reference to the drawings.

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

  FIG. 1 shows a cross-sectional view of a speaker diaphragm according to an embodiment of the present invention.

  As shown in FIG. 1, 27 reduces the beating degree of bamboo fibers obtained from bamboo over 1 year old to a microfibril state, and the beaten fibers and the surface of the beaten fibers form a feather shape. Among the fine fibers grown in this way, the speaker diaphragm is constructed by making a paper containing a material that strengthens the entanglement of the fine fibers grown in a feather shape from the beaten fibers rather than the beaten fibers. is there.

  Here, in the microfibrillation, it is preferable that the average fiber diameter is smaller than 5 μm and that L / D (average fiber length / average fiber diameter) is 10 or more.

  The average fiber diameter of microfibrillation is preferably smaller, and by making it smaller, it becomes possible to improve fiber entanglement.

  Further, L / D (average fiber length / average fiber diameter) is also preferably larger, and by increasing it, it becomes possible to improve the entanglement of the fibers.

  The time required for beating is required to be long, but it is possible to achieve a greater effect by setting the beating degree to an average fiber diameter of 1 μm or less, or even 500 nm or less.

  When the average fiber diameter is larger than 5 μm, it is possible to give the speaker diaphragm a characteristic as a bamboo fiber, but there is a tendency that the force to strengthen the entanglement of the fiber is insufficient.

  Bamboo fibers that have been grown for more than 1 year have a rigidity and a toughness, have a good compatibility with paper pulp, and can improve the rigidity and toughness of the diaphragm and the Young's modulus.

  Since this bamboo fiber is made into a paper structure by beating it down to the microfibril state, the entanglement with the paper pulp can be further improved, sufficient rigidity and toughness can be given to the diaphragm, and the Young's modulus can be improved. .

  The bamboo fiber here is not particularly limited as long as it is a plant of the bamboo family, and may be any bamboo that has grown and has grown for more than one year, except for bamboo shoots and juvenile renels that are less than one year old.

  As for bamboo age, the rigidity and toughness required for the present invention can be secured at the minimum after 1 year or more, but if it is 2 years or more, the rigidity and toughness are further improved, and further 3 years or more. In the course of, the rigidity and toughness are further improved.

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

  As a sound quality feature, resonance due to insufficient diaphragm rigidity in the high sound range can be reduced, and clear sound quality can be obtained in the high sound range. In particular, in the case of a speaker having an elliptical or rectangular shape instead of a circular diaphragm shape, the influence of the resonance appears remarkably, so that it is very effective in an elliptical or rectangular speaker.

  On the other hand, it is possible to reproduce deep bass with good tightening even in the bass range.

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

  Furthermore, as another effect, the toughness of the diaphragm is improved as compared with a diaphragm composed of a single piece of paper pulp, and the diaphragm can be excellent in terms of quality and reliability.

  Therefore, it is possible to improve the input resistance of a speaker using this diaphragm and various reliability typified by moisture resistance reliability which is important as an automobile speaker.

  Therefore, it is possible to improve the sound quality of the speaker using this diaphragm, and to increase the output and reliability.

  Furthermore, the present invention can provide a papermaking diaphragm for a speaker that is inexpensive and friendly to the global environment.

  In addition, this speaker diaphragm can be further mixed with bamboo fiber material having a higher beating degree to further exhibit the original features of bamboo fiber.

  Here, the bamboo fiber material having a higher beating degree preferably has an average fiber diameter of 5 μm or more and 30 μm or less.

  Furthermore, by configuring the bamboo fiber having an average fiber diameter of 5 μm or more and 30 μm or less to be 40 wt% or more, the original performance of the bamboo fiber can be remarkably exhibited.

  Here, when the average fiber diameter is smaller than 5 μm, the above-described microfibril state is obtained and the cost becomes very high.

  On the other hand, if the thickness is larger than 30 μm, the original features of the bamboo fiber are hardly exhibited.

  Similarly, if the content ratio of bamboo fiber is less than 40 wt%, the original features of bamboo fiber are hardly exhibited.

  Furthermore, even if materials other than bamboo fiber are included, by combining with a material in which the beating degree of bamboo fiber is reduced to a microfibril state, the binding strength is enhanced and the features of bamboo fiber can be exhibited.

  Of course, it may be mixed with the coniferous tree, which is the main material of the conventional papermaking diaphragm, and the bond strength is enhanced and the features of bamboo fiber can be exhibited.

  When a material other than bamboo fiber is included, the original performance of the bamboo fiber can be remarkably exhibited by configuring the bamboo fiber to include 40 wt% or more.

  And about the microfibrillated bamboo fiber whose average fiber diameter is smaller than 5 μm, the content of 0.5 wt% or more and 20 wt% or less improves the entanglement with other materials, and the bonding strength between the materials is improved. The physical property value of the diaphragm containing higher bamboo fibers can be improved.

  Here, when the microfibrillated bamboo fiber having an average fiber diameter of less than 5 μm is less than 0.5 wt%, the original binding force is not exhibited, whereas when it is more than 20 wt%, the cost is very high. Become.

(Embodiment 2)
Hereinafter, the second aspect of the present invention will be described with reference to 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 according to claim 1 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.

  Further, the present invention can be applied to a small speaker in which the diaphragm 27 and the edge 29 are integrated.

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

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

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

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

  As described above, the diaphragm containing bamboo fiber according to the present invention is a natural material as well as the material made of conifers that has been the main body as a papermaking diaphragm, and the natural material has a good ear contact, It makes it possible to create sounds that take advantage of the timbre of good characteristics.

  In addition, it is possible to realize an honest and natural sound without being controlled by a unique sound quality character such as a synthetic material or a metal material or a timbre uniformity due to a unique resonance.

  Therefore, it is possible to develop a wide range of speaker sounds in various fields without selecting a field for supplying speakers.

  As another effect, the toughness of the diaphragm is improved as compared with a diaphragm composed of a single piece of paper pulp, and the diaphragm can be excellent in terms of quality and reliability.

  Therefore, it is possible to improve the input resistance of a speaker using this diaphragm and various reliability typified by moisture resistance reliability which is important as an automobile speaker.

  Therefore, the speaker can be excellent in terms of quality and reliability.

  Furthermore, it can greatly contribute to the environmental aspect and the cost aspect.

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

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

  As shown in FIG. 3, the speaker 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.

  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 realize a speaker system that can improve various input reliability such as high input resistance and moisture resistance reliability.

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

  Furthermore, it can greatly contribute to the environmental aspect and the cost aspect.

(Embodiment 4)
The fourth aspect 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 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 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.

  With this configuration, the sound pressure level in the high sound range of the speaker 30 can be improved, and a clear and powerful sound quality can be obtained in the high sound range.

  In addition, it is possible to improve various input reliability such as high input resistance and humidity resistance reliability which is important for automobile speakers.

  Therefore, it can be made excellent in terms of quality and reliability, and the performance and quality of a device such as an automobile equipped with the speaker 30 can be improved.

  Furthermore, it can greatly contribute to the environmental aspect and the cost aspect.

  The loudspeaker diaphragm, the loudspeaker, the electronic device and the device according to the present invention are improved in clarity such as improvement in sound quality and characteristics by a rigid diaphragm, and improvement in sound pressure level in a high sound range, and also high quality and reliability. The present invention can be applied to video and audio equipment and information communication equipment that require high performance, and devices such as automobiles.

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

Explanation of symbols

21 Magnet 22 Upper Plate 23 York 24 Magnetic Circuit 25 Magnetic Gap 26 Frame 27 Diaphragm 28 Voice Coil 29 Edge 30 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini Component System 50 Automobile

Claims (4)

A speaker diaphragm, wherein the speaker diaphragm reduces the beating degree of bamboo fibers obtained from bamboo over 1 year old to a microfibril state, and the beaten fibers and the beaten fibers are beaten. Among the fine fibers grown in a feather shape from the surface of the fiber, for a speaker made of paper containing a material in which the entanglement of the fine fibers grown in a feather shape from the beaten fiber surface is strengthened rather than the beaten fiber. Diaphragm. A frame coupled to the magnetic circuit, the diaphragm according to claim 1 coupled to an outer peripheral portion of the frame, and the diaphragm coupled to the diaphragm, and a part thereof being disposed in a magnetic gap of the magnetic circuit. A speaker consisting of a voice coil. A frame coupled to the magnetic circuit, the diaphragm according to claim 1 coupled to an outer peripheral portion of the frame, and the diaphragm coupled to the diaphragm, and a part thereof being disposed in a magnetic gap of the magnetic circuit. An electronic device comprising a speaker comprising a voice coil and at least an amplifier circuit for an input signal to the speaker. A frame coupled to the magnetic circuit, the diaphragm according to claim 1 coupled to an outer peripheral portion of the frame, and the diaphragm coupled to the diaphragm, and a part thereof being disposed in a magnetic gap of the magnetic circuit. A device comprising a speaker comprising a voice coil as a moving means.

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