JP5321618B2 - DUST CAP FOR SPEAKER, SPEAKER USING THE SAME, AND ELECTRONIC DEVICE AND DEVICE USING THE SPEAKER - Google Patents

Description

  The present invention relates to a speaker dust cap used in various audio equipment and video equipment, speakers using the same, electronic equipment such as a stereo set and a television set, and apparatuses 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 achieve the sound quality requirement that is the user's needs, the development of a diaphragm and a dust cap, which are components of a loud speaker that determines the sound quality, is an urgent task.

  The development of this diaphragm and dust cap has been promoted mainly for papermaking type because it has the advantage of being able to control sound quality with higher accuracy.

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

  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

  Papermaking dust caps, mainly paper dust caps using kraft pulp obtained from conifers, tend to have lower rigidity in general compared to dust caps made of metal or resin materials. It was what had.

  For this reason, it is difficult to improve the material rigidity of conventional paper dust caps, and speakers that use this dust cap have high clarity, high output, and high reliability, which is one of the improvements in sound quality. It had the subject of being disadvantageous for sexualization.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a dust cap for a speaker that solves the above-mentioned problems, improves the material rigidity of the dust cap, achieves high sound quality as a speaker, and can achieve high output and high reliability. To do.

  In order to achieve the above-mentioned object, the present invention makes a paper dust containing a material in which the beating degree of bamboo fiber is reduced to a microfibril state, and a dust cap for speaker is made with a lignin content in bamboo fiber of 6% or more and 15% or less. It is composed.

  By adopting this structure, the bamboo fiber obtained from bamboo having rigidity and toughness is made by making the paper with the beating degree reduced to the microfibril state, thereby improving the entanglement with other materials and improving the speaker. The dust cap for use can be given sufficient rigidity and toughness.

  Therefore, the material properties of the speaker dust cap can be improved, and the rigidity and Young's modulus can be improved.

  As described above, the present invention makes a papermaking including a material in which the beating degree of bamboo fiber obtained from bamboo is reduced to a microfibril state, and the lignin content in bamboo fiber is 6% or more and 15% or less. A cap is constructed, and the rigidity, toughness and Young's modulus of the dust cap are improved, the sound quality of the speaker using the dust cap is improved, and the output can be increased and the reliability can be improved.

  Furthermore, the present invention can provide a papermaking dust cap for speakers that is inexpensive and friendly to the global environment.

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

  Currently, the material used as a papermaking dust cap for speakers is mainly coniferous trees, which spurs the shortage of coniferous trees in the world.

  On the other hand, bamboo has many kinds and quantities all over the world due to its vigorous reproductive potential and rapid growth, and in a particular area, bamboo forests are screaming for their damage.

  Bamboo grows much faster than conifers, and those with a bamboo level that is less than one year old are less rigid and have no toughness, but they are stiff and tough after one year. It has the stable physical property provided with.

  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 paper-making members for speakers, although it has been tackled for bamboo and younger ones within the age of 1 year of bamboo because of the ease of defibration of bamboo fibers, it has been effective to some extent, It did not reach the center of the papermaking member.

  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 than the use of the soft and easy-to-process bamboo and younger ones that are less than 1 year old. It is effective to use grown bamboo fiber with toughness, but it is technically difficult to defibrate the grown bamboo fiber well, so dust that can fully utilize the characteristics of the original bamboo fiber This is because the cap 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, new material beating technology has been developed, and it has become possible to make papermaking on dust caps that take 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 present invention will be described using the first embodiment.

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

  As shown in FIG. 1, 30 is a paper dust cap made by making a paper containing a material in which the beating degree of bamboo fiber obtained from bamboo having a bamboo age of 1 year or more is reduced to a microfibril state.

  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.

  Also, L / D (average fiber length / average fiber diameter) is preferably larger, and by increasing the value, 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 provide the speaker dust cap 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 toughness, have good compatibility with paper pulp, and can improve the rigidity and toughness of the dust cap and the Young's modulus.

  Because this bamboo fiber is made by beating the paper into a microfibril state and making paper, it can further improve the entanglement with the paper pulp, give the dust cap sufficient rigidity and toughness, and improve the Young's modulus. .

  The bamboo fiber here is not particularly limited as long as it is a plant of the bamboo family, and it may be a bamboo that has grown and has grown for more than one year, except for bamboo shoots within the first year of the bamboo and those of the juvenile level.

  And about bamboo age, the rigidity and toughness required for the present invention can be secured at the minimum after one year or more, but if two years or more have passed, the rigidity and toughness are further improved, and further more than three years. If it passes, rigidity and toughness will improve more.

  As a sound quality feature, the sound pressure level in the high sound range can be improved, and a clear and powerful sound quality can be obtained in the high sound range.

  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 dust cap is improved as compared with a dust cap composed of a single paper pulp, and the dust cap can be excellent in terms of quality and reliability.

  Therefore, it is possible to improve the input resistance of the speaker using the dust cap and improve 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 the dust cap, and to increase the output and the reliability.

  Furthermore, the present invention can provide a papermaking dust cap for speakers that is inexpensive and friendly to the global environment.

  In addition, the speaker dust cap can be made to exhibit the original characteristics of bamboo fiber by being mixed with bamboo fiber material having a higher beating degree.

  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 conifer that was the main material of the conventional papermaking dust cap, 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 dust cap containing the higher bamboo fiber 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.

  The material for the diaphragm has been described above. Next, the additive for the dust cap will be described.

  Additives suitable for a dust cap containing bamboo fibers include polylactic acid, raw rubber, polyvinyl alcohol, and the like. By adding these additives, the original performance of bamboo fibers can be remarkably exhibited.

  Polylactic acid and polyvinyl alcohol have good compatibility with the cellulose of bamboo fiber and are easily fixed on the surface of bamboo fiber.

  Further, since there is an effect of increasing the internal loss, the frequency characteristics as a speaker can be improved.

  In particular, polylactic acid is a biodegradable plastic, and a dust cap composed of bamboo fiber and polylactic acid becomes an environment-friendly dust cap and can be used as a papermaking dust cap for speakers that are friendly to the global environment.

  Here, when the polylactic acid has a content of 1 wt% or more and 20 wt% or less, a great effect can be exhibited.

  When the polylactic acid is less than 1 wt%, the fixing ability to the original bamboo fiber is hardly exhibited, whereas when it is more than 20 wt%, the cost is very high.

  On the other hand, a great effect can be exhibited by setting the content of polyvinyl alcohol to 2 wt% or more and 8 wt% or less.

  When the polyvinyl alcohol is less than 2 wt%, the fixing force to the original bamboo fiber is hardly exhibited, whereas when it is more than 8 wt%, the cost is very high.

  The raw rubber also has an effect of increasing the internal loss, and the frequency characteristics as a speaker can be improved, the distortion can be reduced, and the sound quality can also be improved.

  The dust cap additive has been described above. Next, the coloring of the dust cap will be described.

  As for the coloring of the dust cap, it is colored in various colors depending on the demands from the design surface, and as this coloring agent, pigments and dyes are generally used for coloring.

  However, generally used pigments and dyes often reduce the physical properties of the speaker dust cap.

  For this reason, even though the design surface can be improved, the frequency characteristics, low distortion, and sound quality of the speaker are often sacrificed.

  In addition, there are many colorants that contain components that are not environmentally good, which spurs environmental pollution.

  As for the color to be colored as a speaker dust cap, there are generally many black colors.

  On the other hand, bamboo fiber generally has many pale yellow, pale brown, and pale green colors, and can give a good impression in terms of design as an earth color or natural color.

  In addition, finishing in a light color such as a yellow color rather than a dark color such as a black color can appeal the presence more beautifully and improve the appearance quality.

  Furthermore, since the color changes with time after coloring, the color is close to the original color, so that it is difficult to change color and a stable appearance can be maintained for a long time.

  As described above, among the dust caps for speakers that have many dark colors, it is possible to obtain a light cap such as a yellowish color, so that a dust cap having an impact on design can be obtained. .

  Therefore, a color appeal can be realized in some high-class speakers called premium models.

  In addition, the time and material required for the coloring process can be eliminated, and the cost of the speaker dust cap can be reduced.

  Furthermore, since various defects related to coloring do not occur, it can contribute to quality improvement.

  Therefore, by using a dust cap that does not use a colorant, the original color and performance of bamboo fibers can be remarkably exhibited.

  In addition, among pigments, pigments have a great effect of lowering the physical properties of speaker dust caps, so by using dust caps that do not use pigments, the original color and performance of bamboo fibers can be demonstrated significantly. Can do.

  As described above, by using a dust cap that does not use colorants, especially pigments, it is possible to maintain the physical properties of the dust cap, eliminate the occurrence of defects related to coloring, and reduce appearance defects such as discoloration and decolorization. It is possible to appeal the original color of bamboo fiber in design.

  Therefore, the original color characteristics and environmental characteristics of the bamboo fiber can be appealed, and the original performance of the bamboo fiber can be remarkably exhibited without deteriorating.

  Furthermore, when the lignin content in the bamboo fiber is 6% or more and 15% or less, the above-described features can be exhibited in a good state.

  The reason for this is that bamboo fiber is usually formed from about 45% cellulose, about 25% hemicellulose, and about 25% lignin.

  However, it is usually 5% or less during pulping such as chemical cooking.

  When the lignin content is less than 6%, the rigidity, which is the goodness of bamboo fiber, is lost.

  On the other hand, if it exceeds 15%, the dispersibility in the beating process before papermaking deteriorates, and the fixability when a sizing agent or the like is used deteriorates.

  The measurement of lignin content here is a value obtained by a known sulfuric acid method.

  The dust cap of the present invention does not limit the use of known pigments, dyes, sizing agents, paper strength agents and the like.

  As mentioned above, although the dust cap for speakers by papermaking was explained, not only when the shape of the dust cap is directly formed, but also by making a bamboo fiber sheet and press-molding this sheet. Alternatively, a method of forming the shape of the dust cap may be used.

(Embodiment 2)
Hereinafter, the present invention will be described using the second embodiment.

  FIG. 2 shows a cross-sectional view of a speaker according to an embodiment of the present invention.

  As shown in FIG. 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute an internal magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the diaphragm 27 is bonded to the peripheral edge of the frame 26 via an edge 29.

  One end of the voice coil 28 is coupled to the central portion of the diaphragm 27 and the opposite end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  The dust cap 30 is bonded to the front surface of the diaphragm 27.

  In the above, the speaker having the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this, and may be applied to a speaker having an outer magnet type magnetic circuit.

  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 dust cap 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 mentioned above, the dust cap containing bamboo fiber according to the present invention is a natural material as well as the material made of coniferous tree that has been the main body as a papermaking dust cap. It makes it possible to create sounds that make use of good tones.

  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 dust cap has improved toughness as compared with a dust cap composed of a single piece of paper pulp, and the dust cap can be excellent in terms of quality and reliability.

  Therefore, it is possible to increase the input resistance of speakers using this dust cap, improve various reliability typified by moisture resistance reliability, which is important for automobile speakers, and are also beautiful in appearance and difficult to discolor. , Can maintain a stable appearance for a long time.

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

  Further, it can greatly contribute to environmental and cost aspects.

  Furthermore, not only the dust cap, but also the diaphragm, by making a diaphragm made of paper containing a material in which the beating degree of bamboo fiber obtained from bamboo over 1 year old is reduced to a microfibril state, There is an effect.

  In this case, both the dust cap and the diaphragm are made of bamboo fiber material, and the slightly lower reproduction band that the diaphragm handles and the slightly higher reproduction band that the dust cap handles are made of the same bamboo fiber material. Therefore, it is possible to achieve a natural and good sound quality with little change in timbre in the entire range from the low sound range to the high sound range.

(Embodiment 3)
Hereinafter, the present invention will be described using 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 31 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 that 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, which 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 improve the input reliability and various reliability typified by moisture resistance reliability. Also, the speaker is beautiful in appearance, hardly discolored, and can maintain a stable appearance for a long time. A system can be realized.

  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)
Hereinafter, the present invention will be described using the fourth embodiment.

  FIG. 4 shows a cross-sectional view of an automobile 50, which is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 4, an automobile 50 is configured by incorporating the speaker 31 of the present invention into a rear tray or a front panel and using it as a part of car navigation or car audio.

  With this configuration, the sound pressure level in the high sound range of the speaker 31 can be improved, and clear and powerful sound quality can be obtained in the high sound range.

  Furthermore, it is possible to improve the input resistance and various reliability typified by moisture resistance reliability, which is important as an automobile speaker. Also, it is beautiful in appearance and discoloration over time after coloring. The stable appearance can be maintained for a long time.

  Therefore, it can be excellent in terms of quality and reliability, and the performance and quality of a device such as an automobile equipped with the speaker 31 can be improved.

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

  The dust cap, speaker, electronic device and apparatus according to the present invention are improved in clarity such as improvement in sound quality and characteristics due to a highly rigid dust cap, improvement in sound pressure level in a high sound range, and a good appearance and The present invention can be applied to video and audio equipment, information communication equipment, and other electronic devices that require high quality and reliability, and to automobiles and other devices.

DESCRIPTION OF SYMBOLS 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil 29 Edge 30 Dust cap 31 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 50 Automobile

Claims (12)

A speaker dust cap made of paper containing a material in which the beating degree of bamboo fiber is reduced to a microfibril state, wherein the speaker dust cap has a lignin content in the bamboo fiber of 6% to 15%. A dust cap for speakers. The dust cap for a speaker according to claim 1, further comprising a bamboo fiber material having a higher beating degree of the bamboo fiber. The dust cap for a speaker according to claim 2, wherein the bamboo fiber material having a higher beating degree has an average fiber diameter of 5 µm to 30 µm. The dust cap for a speaker according to claim 1 or 2, which contains 40 wt% or more of bamboo fiber having a high beating degree . The speaker dust cap according to claim 1 or 2, wherein the bamboo fiber material having a beating degree reduced to a microfibril state has an average fiber diameter of less than 5 µm. The speaker dust cap according to claim 1 or 2, wherein the bamboo fiber material having a beating degree reduced to a microfibril state has an average fiber diameter of 1 µm or less. The speaker dust cap according to claim 1 or 2, wherein the bamboo fiber material having a beating degree reduced to a microfibril state has an average fiber diameter of 500 nm or less. Freeness microfibril state to reduce claims 1 Symbol placement of speaker dust cap bamboo fiber materials containing more than 0.5 wt% 20 wt% or less. Beating degree microfibrils speaker dust cap according to claim 1, wherein the average fiber length of less bamboo fiber to Brill state / average fiber diameter is 10 or more. A frame coupled to a magnetic circuit; a diaphragm coupled to an outer periphery of the frame; a voice coil coupled to the diaphragm and a part of which is disposed in a magnetic gap of the magnetic circuit; A speaker comprising the dust cap according to claim 1 or 2 coupled to the front surface of the diaphragm. An electronic device comprising the speaker according to claim 10 and at least an amplifier circuit for an input signal to the speaker. An apparatus comprising the speaker according to claim 10 as a moving means.

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