JP2009111802A - Manufacturing method of speaker diaphragm, speaker diaphragm manufactured by the manufacturing method, speaker using the diaphragm, and electronic device and apparatus using the speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily improve the rigidity without degrading the characteristics of a speaker diaphragm having a slim outer shape, relating to a manufacturing method of the speaker diaphragm to be used in various kinds of acoustic apparatuses and video apparatuses, the speaker diaphragm manufactured by the manufacturing method, a speaker, and an electronic device and an apparatus. <P>SOLUTION: Fine natural fibers are formed by spray coating as a sub material for locally improving the rigidity of a diaphragm body at both ends in the longitudinal direction of the diaphragm body for the speaker which is manufactured by a paper making method and includes a rectangular, oblong, track or elliptic outer shape. The manufacturing method of the speaker diaphragm can locally improve the rigidity easily without degrading the characteristics of the speaker diaphragm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a speaker diaphragm used in various audio equipment and video equipment, a speaker diaphragm manufactured by the manufacturing method, a speaker using the diaphragm, an electronic device such as a stereo set and a television set. The present invention relates to devices such as equipment and 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 spread of digital equipment.

  The main trends for speakers in these industries are higher sound quality and smaller size.

  In order to achieve the sound quality required by the user, there is an urgent need to develop a diaphragm that is a component of the speaker and greatly affects the sound quality of the speaker in order to achieve the sound quality required by the user.

  The development of this diaphragm has been focused on papermaking diaphragms because sound quality can be controlled with higher accuracy.

  As a material used for the papermaking diaphragm, conventionally, a material obtained by beating kraft pulp from coniferous trees with a beater or the like has been used.

  In addition, in the trend of miniaturization and compactness, it is necessary to make the external shape of the speaker into a slim shape such as a rectangular shape, a rectangular shape, a track shape, an elliptical shape, and naturally the shape of the speaker diaphragm is also a slim shape. It is necessary to.

  At present, there is a demand for improved performance, particularly sound quality, of these slim speakers and diaphragms.

As prior art document information for the invention of this application, for example, Patent Document 1 is known.
JP 63-126400 A

  Conventional papermaking diaphragms, centering on paper diaphragms using kraft pulp obtained from coniferous trees, generally have lower rigidity compared to diaphragms made of metal or resin materials. There was a tendency.

  For this reason, a speaker using such a paper diaphragm is disadvantageous in terms of high clarity, high output, and high reliability, which are one of the improvements in sound quality.

  If the outer shape of the paper diaphragm is rectangular, rectangular, track, or elliptical, there are parts with lower rigidity at both ends in the longitudinal direction. Speakers using a plate are more difficult to achieve higher sound quality, higher output, and higher reliability as described above.

  Conventionally, in order to make up for the lack of rigidity of the diaphragm, a method of attaching an auxiliary member to the diaphragm entirely or partially using an adhesive, tape, or the like has been taken in the manufacturing process. However, if the auxiliary member is attached as a whole as described above, there is a problem that the weight of the entire diaphragm increases and the characteristics as the diaphragm are deteriorated. Moreover, when it affixed partially, it has the subject that many parts count will become a thing with bad assembly workability | operativity.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker diaphragm manufacturing method capable of easily improving rigidity locally without deteriorating the characteristics of the speaker diaphragm. To do.

  In order to achieve the above-mentioned object, the present invention provides a diaphragm manufactured by a papermaking method, and having the diaphragm at both longitudinal ends of a diaphragm main body for a speaker having a rectangular shape, a rectangular shape, a track shape, or an elliptical shape. A speaker diaphragm manufacturing method is characterized in that fine natural fibers are formed by spray coating as a secondary material for locally improving the rigidity of the main body.

  With this manufacturing method, it is possible to provide a method for manufacturing a speaker diaphragm that can easily improve the rigidity locally without deteriorating the characteristics of the speaker diaphragm.

  As described above, in the manufacturing method according to the present invention, the speaker diaphragm having a slim outer shape is miniaturized as a secondary material for compensating for the lack of rigidity only at both ends in the longitudinal direction, that is, at a portion having low rigidity. Since natural fibers are formed, the lack of rigidity can be compensated for by an increase in weight that does not affect the characteristics of the diaphragm. In addition, since the spray coating method is used as the forming method, there is no process of attaching natural fibers with an adhesive or a tape, and a slim speaker diaphragm having improved rigidity without reducing workability is manufactured. be able to.

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

  FIG. 1 is a process chart showing a method of manufacturing a speaker diaphragm by a papermaking method to which an embodiment of the present invention is applied, and using this process, the speaker diaphragm is completed by the manufacturing method of the present invention. explain.

  As shown in FIG. 1, first, the material of the speaker diaphragm is put into a beater containing water and finely beaten by a beating process over several days.

  Next, the beaten material is drawn up on a mold and a metal mesh placed thereon by a papermaking method, and only moisture is discharged by suction from below, so that it is shaped as a speaker diaphragm. Form.

After that, a portion of the diaphragm main body other than spray coating is masked, and a treatment liquid obtained by diluting natural fibers with an average fiber length of 0.5 mm or more and a BET specific surface area of 1 m ² / g or more diluted with water or the like. Then, apply to the diaphragm body by spraying. Since the mold is sucked, only the moisture is discharged from the sprayed natural fiber treatment liquid.

  Next, the remaining water is heated and pressurized to evaporate.

  And the outermost peripheral part which becomes unnecessary and the center hole part for inserting the voice coil are punched by a mold.

  Thus, the speaker diaphragm according to the manufacturing method of the present invention is completed.

  Note that, here, a method for manufacturing a diaphragm for a speaker by a general conventional paper making method is shown in which one embodiment of the present invention is applied. However, the method for manufacturing a diaphragm is not limited to this. It is applicable if a paper making process is included.

  Further, the spray application may be performed at the same time as or after the paper making process, and can be performed even after the pressurizing process and the punching process.

  Here, in the present invention, as a method of refining natural fibers, a method of beating with a bead mill after beating with a biaxial kneader is used. In this construction method, the material can be miniaturized at a lower cost and in a shorter time than the refinement method using a general beater or the like. That is, it is possible to efficiently produce fibers having a large reinforcing effect when applied to the diaphragm.

In addition, it is desirable that the refined natural fiber has an average fiber length of 0.7 mm or more and 1.5 mm or less from the viewpoint of further improving the rigidity of the coated surface and the efficiency of producing the refined fiber. Further, the BET specific surface area is preferably 1 m ² / g or more from the viewpoint of the effect of improving the rigidity.

  Moreover, it is desirable that the natural fiber to be applied is bamboo fiber. The reason for this is that bamboo fiber has high rigidity as a fiber and has a multilayer structure with a four-layer surface, which is suitable in that the surface is feathered by frictional force, and is also good in terms of the environment. And the like.

  Here, the specific example of the manufacturing method of the refined bamboo fiber in this invention and the manufacturing method of the diaphragm which spray-coated it is shown below.

700 g of bamboo fiber having an average fiber length of about 10 cm is treated with a pressure kneader having a volume of 3 liters at 25 rpm for 20 minutes and beaten. Thereafter, it is made into a 5% aqueous dispersion, treated with a 3 liter bead mill using glass beads for 20 minutes, and further beaten. The average fiber length of the beaten fiber was 0.8 mm, and the BET specific surface area was 2.11 m ² / g. Then, a solution obtained by diluting this treatment solution with water to 2% is masked on the part other than the spray coating, and the paper making diaphragm placed on the sucking paper making mold is placed on the flat surfaces at both ends in the longitudinal direction. Spray application was performed while sucking in two close parts. Thereafter, it was dried at 160 ° C. for 5 minutes to complete a diaphragm.

  The increase in the weight of the diaphragm manufactured by this method is 0.5 g compared to the case where the fine bamboo fiber is not spray-coated, and this is not a weight that greatly affects the characteristics of the diaphragm.

  In this way, spraying fine natural fibers, especially bamboo fibers, on the weakly rigid parts of the rectangular diaphragm, rectangular shape, track shape, elliptical shape, etc. that are close to the flat surfaces at both ends in the longitudinal direction. Thus, the rigidity of the diaphragm can be locally improved without greatly affecting the characteristics of the diaphragm itself and reducing the workability. Further, by refining natural fibers by the method of the present invention, that is, a method of beating with a biaxial kneader and then beating with a bead mill, fine natural fibers can be obtained at a lower cost and in a shorter time.

(Embodiment 2)
Hereinafter, the invention according to claim 4 of the present invention will be described using the second embodiment.

  FIG. 2 is a plan view of a speaker diaphragm manufactured by the manufacturing method according to the present invention, and a frame suitable for downsizing and downsizing a set of a television, an audio, and the like, and an outer shape. Is a speaker diaphragm having a track-shaped diaphragm.

  2 shown in FIG. 2 indicates a secondary material formed by this manufacturing method.

  Although FIG. 2 shows a track-shaped diaphragm, a rectangular shape, a rectangular shape, and an elliptical shape can be similarly applied.

  Since the rigidity of the speaker diaphragm manufactured by this manufacturing method is improved, clear sound with reduced resonance due to insufficient low-frequency diaphragm rigidity due to tight bass in the low frequency range. In addition to providing a diaphragm, the diaphragm can also achieve higher output and higher reliability.

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

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

  As shown in FIG. 3, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an inner magnet type magnetic circuit 24.

  A frame 26 is coupled to the upper plate 22 of the magnetic circuit 24, and the outer periphery of the diaphragm 27 according to claim 4 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 center portion of the diaphragm 27 and the other 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 the present invention 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, the low-rigidity portion as described in the second embodiment is reinforced, and the speaker is configured by using a diaphragm having locally improved rigidity, so that a deep bass with tightness in the low frequency range can be obtained. Can play clear sound in high range.

  Here, the diaphragm completed by the manufacturing method of the refined bamboo fiber described in the first embodiment and the manufacturing method of the diaphragm coated with the same, and the diaphragm not sprayed are used. Speakers were assembled and frequency-sound pressure characteristics were measured. The deviation of the sound pressure of the diaphragm using the unsprayed diaphragm was 12 dB, whereas that using the sprayed diaphragm was 5 dB. That is, the sound pressure deviation improved by 7 dB with a weight increase of only 0.5 g, and the effect of the speaker using the speaker papermaking diaphragm in the present invention was confirmed.

(Embodiment 4)
Hereinafter, the fourth aspect of the present invention will be described using the fourth embodiment.

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

  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 that is an amplifying means for an electric signal input to the speaker and a source input to the amplifier 42 are provided. An audio mini-component system 44, which is an electronic device, is configured by including a player 43 for output.

  With this configuration, it is possible to realize a minicomponent system that obtains a deep bass sound that is tight in the low sound range and a clear and powerful sound quality in the high sound range.

  Furthermore, it is possible to provide a mini component system that is excellent in terms of quality and reliability.

(Embodiment 5)
Hereinafter, the fifth aspect of the present invention will be described with reference to the fifth embodiment.

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

  As shown in FIG. 5, an automobile 50 is constructed 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.

  Furthermore, 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.

  The method for manufacturing a speaker diaphragm according to the present invention can be applied to a method for manufacturing a speaker diaphragm capable of providing a high-quality diaphragm at a low price. In addition, the speaker diaphragm, the speaker, the electronic equipment, and the device manufactured by this manufacturing method need to be small and compact, and the sound quality and characteristics are improved by the rigid diaphragm, and high quality and reliability are required. The present invention can be applied to electronic devices such as audiovisual equipment and information communication equipment, and further to devices such as automobiles.

Process chart which shows the manufacturing method of the diaphragm for speakers in one embodiment of the present invention The top view of the diaphragm for speakers in one embodiment of the present invention Sectional drawing of the diaphragm for speakers 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

20 Sub-material 21 Magnet 22 Upper plate 23 Yoke 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 (7)

In order to locally improve the rigidity of the vibrating body at both ends in the longitudinal direction of the diaphragm body for a speaker manufactured by a papermaking method and having a rectangular shape, a rectangular shape, a track shape, or an elliptical shape. A method of manufacturing a diaphragm for a speaker, wherein fine natural fibers are formed as a secondary material by spray coating. The method for manufacturing a speaker diaphragm according to claim 1, wherein the natural fibers are refined by beating with a biaxial kneader and subsequent beating with a bead mill. The method for manufacturing a speaker diaphragm according to claim 1, wherein the natural fiber is bamboo fiber. Made by the papermaking method, finely divided natural fibers are formed by spraying at both ends in the longitudinal direction of the diaphragm main body for speakers that have a rectangular shape, rectangular shape, track shape, or elliptical shape. And a speaker diaphragm provided with a secondary material for locally improving the rigidity of the diaphragm main body. A frame coupled to the magnetic circuit, a loudspeaker diaphragm according to claim 4 coupled to an outer peripheral portion of the frame, and a part of the diaphragm coupled to the diaphragm and disposed in a magnetic gap of the magnetic circuit. A speaker composed of a voice coil. A frame coupled to the magnetic circuit, a loudspeaker diaphragm according to claim 4 coupled to an outer peripheral portion of the frame, and a part of the diaphragm coupled to the diaphragm and disposed in a magnetic gap of the magnetic circuit. An electronic device comprising a speaker made of a voice coil and at least an amplifier circuit for an input signal to the speaker. A frame coupled to the magnetic circuit, a loudspeaker diaphragm according to claim 4 coupled to an outer peripheral portion of the frame, and a part of the diaphragm coupled to the diaphragm and disposed in a magnetic gap of the magnetic circuit. A device comprising a moving means provided with a speaker comprising a voice coil.

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