JP2009027308A - Speaker diaphragm, speaker using the same and method of manufacturing speaker diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker diaphragm exhibiting excellent vibration characteristics in loud sound zone. <P>SOLUTION: The speaker diaphragm 4 includes a textile fabric 5 impregnated with thermosetting resin, and a paper making board 6 superimposed on the textile fabric 5 integrally. Since the paper making board 6 is impregnated with thermosetting resin on the textile fabric 5 side and the opposite side, hardness of the paper making board 6 can be enhanced. Consequently, propagation velocity of the paper making board 6 can be enhanced and vibration characteristics of the speaker diaphragm 4 can be enhanced in loud sound zone. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker diaphragm, a speaker using the same, and a method of manufacturing the speaker diaphragm.

  The characteristics of speaker diaphragms used for speakers of various audio equipments vary greatly depending on their propagation speed and internal loss.

  That is, the loudspeaker diaphragm is superior in vibration characteristics in the high sound range as the propagation speed is higher, and the higher the internal loss is, the higher the sound quality can be reproduced by preventing the occurrence of resonance.

  However, generally, a speaker diaphragm having a high propagation speed has a low internal loss, and a speaker diaphragm having a high internal loss has a low propagation speed.

  Therefore, it has been important for the speaker diaphragm to have an appropriate internal loss as well as an appropriate internal velocity and smooth vibration characteristics.

  Therefore, as shown in FIG. 10, a papermaking paper plate 2 is polymerized on a sheet 1 formed of a nonwoven fabric impregnated with a thermosetting resin such as a phenol resin, and these are thermocompression integrated by hot drawing, and the thermosetting Patent Document 1 has proposed a speaker diaphragm 3 formed by thermosetting a functional resin.

That is, in the loudspeaker diaphragm 3 described in Patent Document 1, the hardness of the diaphragm can be increased by thermosetting the sheet 1 with a thermosetting resin, and the papermaking paper board 2 with high internal loss is integrated. Thus, an excellent sound quality speaker was provided.
Japanese Utility Model Publication No.59-106289

  In the conventional speaker diaphragm 3 described above, the vibration characteristics of the entire sound range are smooth. However, the speaker diaphragm 3 includes the papermaking paper plate 2 that is paper and has a low propagation speed. The vibration characteristics in the high sound range of the diaphragm 3 for use were not excellent.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker diaphragm having excellent vibration characteristics in the high sound range.

  In order to achieve this object, the speaker diaphragm according to the present invention includes a woven fabric impregnated with a thermosetting resin and a papermaking paper plate integrated with the woven fabric, and the papermaking paper plate is woven. The fabric side and the opposite side were impregnated with a thermosetting resin.

  With the above configuration, the present invention can provide a speaker diaphragm having excellent vibration characteristics in a high sound range.

  That is, by impregnating the thermosetting resin on the woven fabric side and the opposite side of the papermaking board, the hardness of the papermaking board of the speaker diaphragm can be increased.

  As a result, the propagation speed of the papermaking board can be increased, and the vibration characteristics in the high sound range of the speaker diaphragm can be improved.

  The configuration of an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the speaker diaphragm 4 in the present embodiment includes a papermaking paper plate 6 integrated by thermocompression bonding on the back side of a woven fabric 5 formed of a woven fabric. The surface has a structure in which a weave (9 in FIG. 2) woven by warp yarns 7 and weft yarns 8 is exposed. Here, the woven fabric 5 has a structure in which the texture is exposed on the front surface side, but since the papermaking paper plate 6 is thermocompression bonded to the back surface side thereof, the front surface side to the back surface side of the speaker diaphragm 4 are spread. Air never passes. Further, the woven fabric 5 is in a state in which a thermosetting resin (not shown) exists in the inside and the outer periphery of each of the warp yarn 7 and the weft yarn 8, and when the thermosetting resin is thermoset, the warp yarn 7 and The weft 8 itself and the woven fabric 5 formed by weaving them are in a cured state.

  The woven fabric 5 is a woven fabric containing at least one of high-strength fibers such as aramid fibers, polyester fibers, acrylic fibers, cotton fibers, carbon fibers, glass fibers, and silk fibers.

  On the back side of the woven fabric 5, a papermaking paper plate 6 formed by mixing cellulose fibers alone or mixing them with chemical fibers is integrated by thermocompression bonding. The papermaking board 6 contains the same thermosetting resin as that contained in the woven fabric 5, that is, the thermosetting resin that is the same as the thermosetting resin contained in the woven fabric 5, or has a melting point and a thermal shrinkage rate close to each other. As in the case of the woven fabric 5, the papermaking paper board 6 is in a cured state by the thermosetting of the thermosetting resin.

  As the thermosetting resin, a resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester resin can be used.

  Here, FIG. 3 shows a cross-sectional view of the speaker 10 using the speaker diaphragm in the present embodiment described above.

  As shown in FIG. 3, the speaker 10 includes a magnetic circuit 12 having a cylindrical magnetic gap 11, and a cylindrical shape in which a portion of the cylindrical conductor 13 is movably disposed in the magnetic gap 11 of the magnetic circuit 12. Voice coil 14.

  And the inner peripheral part of the disk-shaped speaker diaphragm 4 is connected to the outer part of the magnetic gap 11 of the voice coil 14, and the outer peripheral part of the speaker diaphragm 4 is connected to the dish-shaped frame 15. The planar shape held in the upper surface opening portion is connected to the inner peripheral portion of the ring-shaped first edge 16. A hemispherical dust cap 17 is provided in the vicinity of the inner peripheral portion of the speaker diaphragm 4 so as to cover the upper surface side of the voice coil 14, and the dust cap 17 has dust and moisture inside the speaker 10. It has a function to prevent the intrusion of etc.

  Further, the lead wire 18 from the lead wire 13 of the voice coil 14 is connected to the speaker diaphragm 4 from a portion (middle part) between the connection portion of the speaker diaphragm 4 of the voice coil 14 and the portion disposed in the magnetic gap 11. Is pulled out to the frame 15 in a non-contact state.

  Further, one end side of the ring-shaped second edge 19 is connected to a portion of the voice coil 14 between the lead-out portion 18 of the lead wire 18 and the arrangement portion in the magnetic gap 11 with a planar shape formed by an elastic body. The other end of the second edge 19 is in contact with the inner surface intermediate portion of the frame 15.

  The second edge 19 and the first edge 16 are formed of an elastic body such as urethane or rubber. The second edge 19 is downward, and the first edge 16 is upward. The shape protrudes in the opposite direction.

  Thus, by making the first edge 16 and the second edge 19 project in opposite directions, the movable load in the upward and downward direction of the voice coil 14 is approximated.

  Accordingly, the upward and downward movements of the speaker diaphragm 4 are the same, and as a result, distortion included in the sound reproduced from the speaker 10 can be reduced.

  When an audio signal is passed through the voice coil 14 of the speaker 10 configured as described above, the voice coil 14 reacts with a magnetic field formed by the magnetic circuit 12 and a driving force is generated in the voice coil 14. This driving direction follows the Fleming left-hand rule, and the voice coil 14 varies in the vertical direction. Due to the fluctuation of the voice coil 14, the speaker diaphragm 4 whose inner peripheral portion is connected to the voice coil 14 similarly vibrates in the vertical direction, and the sound is generated from the speaker 10 by moving the air. It has become.

  However, the loudspeaker diaphragm using a paper-made paper board made of pulp, carbon or the like has a low vibration velocity in the high-frequency range because the propagation speed of the paper-made paper board portion is low.

  Therefore, the speaker diaphragm 4 of the present embodiment is configured such that the woven fabric side of the papermaking paper plate 6 and the opposite side are impregnated with a thermosetting resin.

  Thereby, the vibration characteristic of the high sound range of the diaphragm 4 for speakers can be improved.

  This is because the hardness of the papermaking paper board 6 is increased by the thermosetting of the thermosetting resin impregnated in the papermaking paper board 6.

  That is, as the hardness of the papermaking paper plate 6 increases, the propagation speed of the papermaking paper plate 6 is also increased, and the vibration characteristics of the loudspeaker diaphragm 4 can be improved.

  Further, in the speaker diaphragm 4 of the present embodiment, the paper-making paper plate 6 is cured with a thermosetting resin, so that the strength against stress during reproduction of the speaker 10 is also increased. That is, the speaker diaphragm 4 of the present embodiment has an effect of reducing the possibility of breakage of the speaker diaphragm 4 in addition to the above-described effect of improving the high-frequency vibration characteristics.

  Moreover, it is good also as a structure which impregnates the inside of the papermaking paper board 6 with a thermosetting resin. As a result, the hardness of the papermaking plate 6 is further increased, and the vibration characteristics of the high frequency range of the speaker diaphragm 4 can be further improved.

  In addition, the thermosetting resin impregnated in the papermaking board 6 in this embodiment is the same as the woven fabric 5.

  Thus, when the thermosetting resin of the papermaking paper board 6 is made of the same quality as the thermosetting resin contained in the woven cloth 5, the degree of adhesion at the boundary between the papermaking paper board 6 and the woven cloth 5 increases. As a result, The bonding strength between the papermaking paper plate 6 and the woven fabric 5 can be sufficiently ensured, and the strength of the speaker diaphragm 4 can be increased.

  Further, the woven fabric 5 is desirably a woven fabric 5 in which a texture 9 is exposed on the surface opposite to the joint surface with the papermaking board 6.

  That is, as shown in FIG. 2, when the weave 9 formed by the warp yarns 7 and the weft yarns 8 is exposed on the entire surface of the woven fabric 5, the local vibration on the surface side of the speaker diaphragm 4 is assumed. The occurrence of resonance action can be prevented.

  Further, as the thermosetting resin contained in the woven fabric 5, it is desirable to use a resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester resin. A resin containing these resins can be sufficiently cured during thermocompression bonding to increase the hardness of the speaker diaphragm 4 and improve the high-frequency vibration characteristics of the speaker diaphragm 4.

  The woven fabric 5 may be a woven fabric containing at least one of aramid fibers, polyester fibers, acrylic fibers, cotton fibers, carbon fibers, glass fibers, and silk fibers. If it is a woven fabric containing these fibers, the strength of the woven fabric 5 can be increased, and accordingly, the hardness of the speaker diaphragm 4 is increased, and the vibration characteristics of the high frequency range of the speaker diaphragm 4 are improved. Can be made.

  Hereinafter, a method for manufacturing the speaker diaphragm 4 will be described.

  FIG. 4 shows a molding machine composed of a first mold 20 and a second mold 21 for forming the speaker diaphragm 4.

  The first mold 20 has a truncated cone shape with a molding die protruding downward, and the second mold 21 receives the truncated cone shape below the first mold 20. Although not illustrated in the first mold 20 and the second mold 21, a heater for heating is embedded.

  Such a first mold 20 and a second mold 21 are prepared. First, the first mold 20 is largely pulled upward in the second mold 21.

  From this state, a dish-shaped papermaking screen 22 is placed on the second mold 21 as shown in FIG.

  The papermaking screen 22 is in a state in which pulp fibers for making the papermaking paper board 6 are scooped up from the pulp solution, and a paper fiber layer 23 is provided on the papermaking screen 22. At this time, the thickness of the paper fiber layer 23 is approximately 10 mm. The papermaking screen 22 is preferably coated with a release agent. Thus, if the release agent is applied to the papermaking screen 22, the papermaking screen 22 can be easily peeled off from the papermaking paper plate 6 after completion of molding.

  Next, as shown in FIG. 6, the first mold 20 is pushed down to the second mold 21 to compress the paper fiber layer 23. The purpose of this compression is to evaporate the moisture in the paper fiber layer 23, and the heating heaters provided in the first mold 20 and the second mold 21 are adjusted to a low temperature, or the compression time is adjusted. Is adjusted, the paper fiber layer 23 is compressed.

  Then, as shown in FIG. 7, the 1st metal mold | die 20 and the 2nd metal mold | die 21 are opened. At this time, the thickness of the paper fiber layer 23 on the second mold 21 is approximately 3 mm by the previous compression, and the unevenness existing on the surface is reduced compared to before the compression, and is smooth. . Further, the paper fiber layer 23 in this state is removed from the second mold 21 with the paper making screen 22 alone or only the paper fiber layer 23 alone, and the prepared thermosetting resin is filled with fluidity. Soaked in a sealed container and soaked in a thermosetting resin. As a result, the thermosetting resin infiltrates into the paper making screen 22 side of the paper fiber layer 23 and the opposite side, and further infiltrates into the paper fiber layer 23. In addition, you may infiltrate thermosetting resin by apply | coating or spraying thermosetting resin from the upper and lower surfaces of the paper fiber layer 23 in the state of FIG. Alternatively, a thermosetting resin may be present on the front, back, and inside of the paper fiber layer 23 by applying and spraying from the upper surface of the paper fiber layer 23 and sucking it downward from the second mold 21.

  Next, as shown in FIG. 8, the flat woven fabric 24 before pressing the woven fabric 5 is disposed between the first mold 20 and the second mold 21. The woven fabric 24 is impregnated with the same thermosetting resin as the thermosetting resin previously infiltrated into the entire paper fiber layer 23.

  From this state, as shown in FIG. 9, the first mold 20 is pushed down to the second mold 21, and the woven fabric 24 and the paper fiber layer 23 are pressurized and compressed. By this pressurization and compression, the thermosetting resins contained in the woven fabric 24 and the paper fiber layer 23 are mixed with each other.

  Furthermore, in a state where the woven fabric 24 and the paper fiber layer 23 are clamped, the first mold 20 and the second mold 21 are heated to 180 degrees to 250 degrees, and the thermosetting properties are mixed with each other. The resin is thermally cured to integrate the woven fabric 24 and the paper fiber layer 23, and then the integrated woven fabric 24 and the paper fiber layer 23 are taken out from the molding machine, and the papermaking screen 22 is peeled off from the paper fiber layer 23. As a result, the speaker diaphragm 4 shown in FIGS. 1 and 2 is formed.

  As described above, in the manufacturing method according to the present embodiment, the speaker diaphragm 4 is cured by thermosetting the thermosetting resin contained in the papermaking paper board 6 and the woven fabric 5, and as a result, the papermaking process. The propagation speed of the paper board 6 is increased, and the vibration characteristics of the loudspeaker diaphragm 4 in the high sound range can be improved.

  As described above, the speaker diaphragm 4 in the present embodiment has excellent vibration characteristics in the high sound range, and the present invention can contribute to improvement of the quality of the speaker.

  The speaker diaphragm of the present invention has excellent vibration characteristics in the high sound range because the paper-making paper board and woven fabric constituting the speaker diaphragm are thermoset with a thermosetting resin, and is useful in various acoustic devices. It is a thing.

The principal part expanded sectional view which shows the diaphragm for speakers of one Embodiment of this invention. The perspective view which shows the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the speaker of one Embodiment of this invention Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Sectional drawing which shows the manufacturing method of the diaphragm for speakers of one Embodiment of this invention. Schematic sectional view showing the main parts of a conventional speaker diaphragm

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Speaker diaphragm 5 Woven cloth 6 Papermaking board 7 Warp yarn 8 Weft 9 Weave 10 Speaker 11 Magnetic gap 12 Magnetic circuit 13 Conductor 14 Voice coil 15 Frame 16 First edge 17 Dust cap 18 Leader 19 Second edge 20 First mold 21 Second mold 22 Papermaking screen 23 Paper fiber layer 24 Woven fabric

Claims (10)

A woven fabric impregnated with a thermosetting resin;
It is equipped with a papermaking paper board integrated with this woven fabric,
The papermaking board is a speaker diaphragm in which a thermosetting resin is impregnated on the woven fabric side and the opposite side. The speaker diaphragm according to claim 1, wherein a thermosetting resin is impregnated in the papermaking paper board. The speaker diaphragm according to claim 1, wherein the thermosetting resin impregnated in the woven fabric and the papermaking board is the same. The speaker diaphragm according to claim 1, wherein the woven fabric has a texture exposed on a surface opposite to a joint surface with the paper-making paper plate. The speaker diaphragm according to claim 1, wherein a resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester resin is used as the thermosetting resin contained in the woven fabric or the papermaking paper plate. The speaker diaphragm according to claim 1, wherein the woven fabric contains at least one of aramid fiber, polyester fiber, acrylic fiber, cotton fiber, carbon fiber, glass fiber, and silk fiber. The speaker using the diaphragm for speakers as described in any one of Claims 1-6. The first mold,
A method of manufacturing a speaker diaphragm by a molding machine provided with the first mold and a second mold provided so as to be aligned with the first mold when the mold is clamped. ,
A speaker diaphragm manufacturing method comprising a resin impregnation step of impregnating the papermaking paper plate with a thermosetting resin before a mold clamping step of thermocompression bonding the papermaking paper plate and the woven fabric. The method for manufacturing a speaker diaphragm according to claim 8, wherein in the resin impregnation step, the papermaking paper plate is impregnated with a thermosetting resin. The method for manufacturing a speaker diaphragm according to claim 8, wherein the resin impregnation step is performed by applying or spraying a thermosetting resin on the front and back surfaces of the papermaking paper board.

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