JP5125540B2 - Speaker diaphragm and speaker using the same - Google Patents

Description

  The present invention relates to a speaker diaphragm and a speaker using the same.

  In order for the speaker to reproduce sound with excellent sound quality, it is necessary that the speaker diaphragm used for the speaker has a large Young's modulus and internal loss.

  For this reason, for example, in Patent Document 1, an inorganic fiber woven fabric 1 as shown in the cross-sectional electron micrograph of FIG. 9A and the cross-sectional view of FIG. 9B is woven with warp 1a and weft 1b. A speaker diaphragm 4 composed of a laminate 3 in which a natural fiber nonwoven fabric 2 is superimposed on the lower surface has been proposed.

That is, in the speaker diaphragm 4 described in Patent Document 1, the inorganic fiber woven fabric 1 having a small Young loss but a large Young's modulus is integrated with the natural fiber nonwoven fabric 2 having a small Young's modulus but a large internal loss. By doing so, it was intended to realize characteristics excellent in both Young's modulus and internal loss.
JP 2003-219493 A

  However, since the conventional speaker diaphragm 4 has a configuration in which the inorganic fiber woven fabric 1 and the natural fiber nonwoven fabric 2 having different properties are overlapped, the inorganic fiber woven fabric 1 and the natural fiber nonwoven fabric 2 are sufficient. It was hard to say that it was integrated into

  Therefore, in the conventional speaker diaphragm 4, it is difficult to fully exhibit the large Young's modulus of the inorganic fiber woven fabric 1 and the large internal loss of the natural fiber nonwoven fabric 2, and the sound quality of the speaker is sufficiently improved. It was not something that could be planned.

  Therefore, an object of the present invention is to improve the sound quality of a speaker by increasing the Young's modulus and internal loss of the speaker diaphragm.

  In order to achieve this object, the speaker diaphragm according to the present invention includes a woven fabric layer in which the impregnated thermosetting resin is in a thermoset state, and a paper layer integrated on the back side of the woven fabric layer. The fluff of the paper layer filled in the stitches of the woven fabric layer is entangled with the woven yarn of the woven fabric layer from the surface side of the woven fabric layer and integrated with a thermosetting resin. It was.

  With the above configuration, the present invention can increase the Young's modulus and internal loss of the speaker diaphragm, and improve the sound quality of the speaker.

  This is because the fluff of the paper layer filled with the stitches of the woven fabric layer of the speaker diaphragm according to the present invention is entangled from the surface of the woven fabric layer to the woven yarn of the woven fabric layer, and is further made of a thermosetting resin. This is because the structure is fixed.

  That is, in the speaker diaphragm according to the present invention, a large internal loss can be obtained because the mesh of the woven fabric layer is filled with pulp having a large internal loss.

  The speaker diaphragm according to the present invention is different from the conventional speaker diaphragm 4 because the fluff of the paper layer is fixed by the thermosetting resin in a state where the fluff of the paper layer is entangled with the woven yarn from the surface side of the woven fabric layer. The woven fabric layer and the paper layer are integrated. Therefore, the loudspeaker diaphragm according to the present invention is stronger than the conventional loudspeaker diaphragm 4, that is, has a higher Young's modulus.

  As a result, the speaker diaphragm according to the present invention can improve the sound quality of the speaker.

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

  FIG. 1A is a perspective view of the speaker diaphragm 5, and FIG. 1B is an enlarged view of a main part when the speaker diaphragm is viewed from the surface side. As shown in FIG. 1A, the speaker diaphragm 5 of the present embodiment has a two-layer structure of a woven fabric layer 6 and a paper layer 7.

  As shown in FIG. 1A, the woven fabric layer 6 is formed by weaving two types of woven yarns 9 of warp yarns 8a and weft yarns 8b in a lattice pattern. It is in a state exposed on the surface. A thermosetting resin (not shown) exists in the inside and the outer periphery of the warp yarn 8a and the weft yarn 8b, and the warp yarn 8a and the weft yarn 8b itself are obtained by thermosetting the thermosetting resin. And the woven fabric layer 6 formed by weaving them is in a cured state. The woven fabric layer 6 is configured to contain at least one of high-strength fibers such as aramid fibers, polyester fibers, acrylic fibers, cotton fibers, carbon fibers, glass fibers, silk fibers, and the like as a thermosetting resin. Uses a resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester resin.

  The paper layer 7 is formed by mixing aramid fibers with cellulose fibers, and is integrated on the back side of the woven fabric layer 6 by thermocompression bonding. Thus, since the paper layer 7 is thermocompression integrated on the back side of the woven fabric layer 6, air does not pass from the front surface side to the back surface side of the speaker diaphragm 5. Further, the pulp constituting the paper layer 7 is filled in a stitch 10 which is a portion surrounded by the adjacent warp yarn 8a and the weft yarn 8b of the woven fabric layer 6, and the pulp fluff 7a of the paper layer 7 is shown in FIG. As shown in (b), the warp yarn 8a and the weft yarn 8b are entangled from the surface side of the woven fabric layer 6 and are cured together with the woven yarn 9 by a thermosetting resin. Strictly speaking, the stitch 10 refers to a substantially rectangular parallelepiped portion whose bottom surface is surrounded by the warp yarn 8 a and the weft yarn 8 b and whose height is equal to the thickness of the woven yarn 9.

  Here, a cross-sectional electron micrograph and a cross-sectional schematic view taken along the dotted line AA ′ in FIG. 1B are shown in FIG. 2A and FIG. 2B, respectively.

  That is, in the speaker diaphragm 5 in the present embodiment, as shown in FIGS. 2 (a) and 2 (b), the portion of the stitch 10 between the warps 8a is filled with pulp of the paper layer 7, The pulp fluff 7a of the paper layer 7 is thermocompression bonded in a state where it is entangled with the warp yarn 8a from the surface side of the woven fabric layer 6. Here, the state in which the fluff 7a is entangled with the warp yarn 8a has been described with reference to FIG. 2A and FIG. 2B. ing.

  Next, FIG. 3 shows a cross-sectional view of the speaker 12 using the speaker diaphragm in the present embodiment described above.

  As shown in FIG. 3, the speaker 12 includes a magnetic circuit 14 having a cylindrical magnetic gap 13, and a cylindrical shape in which a portion of the cylindrical conductor 15 is movably disposed in the magnetic gap 13 of the magnetic circuit 14. Voice coil 16.

  The outer peripheral portion of the shallow plate-like speaker diaphragm 5 is connected to the outer portion of the magnetic gap 13 of the voice coil 16, and the outer peripheral portion of the speaker diaphragm 5 is a deep dish-shaped frame 17. The cross-sectional shape held in the upper surface opening portion is connected to the inner peripheral portion of the ring-shaped first edge 18. A hemispherical dust cap 19 is provided in the vicinity of the inner peripheral portion of the speaker diaphragm 5 so as to cover the upper surface side of the voice coil 16, and the dust cap 19 has dust and moisture on the magnetic gap 13. It has a function to prevent the intrusion of etc.

  Further, the lead wire 20 from the lead wire 15 of the voice coil 16 is not in contact with the speaker diaphragm 5 between the speaker diaphragm 5 connecting portion of the voice coil 16 and the portion disposed in the magnetic gap 13. Is pulled out to the frame 17.

  Further, an inner peripheral end of the second edge 21 having a ring-shaped cross section formed by an elastic body is formed in a portion between the lead wire 20 lead portion and the magnetic gap 13 placement portion of the voice coil 16. It is connected via a suspension holder 21a. The other end of the second edge 21 is connected to the inner surface intermediate portion of the frame 17.

  The second edge 21 and the first edge 18 are formed of an elastic body such as urethane or rubber. The second edge 21 is downward, and the first edge 18 is upward. The shape protrudes in opposite directions.

  Thus, by making the first edge 18 and the second edge 21 project in opposite directions, the movable load in the upward and downward directions of the voice coil 16 is approximated.

  Therefore, the operation of the speaker diaphragm 5 also has an upward and downward symmetry, and as a result, distortion included in the sound reproduced from the speaker 12 can be reduced.

  When an audio signal is passed through the voice coil 16 of the speaker 12 configured as described above, it reacts with the magnetic field formed by the magnetic gap 13 and a driving force is generated in the voice coil 16. This driving direction follows the Fleming left-hand rule, and the voice coil 16 varies in the vertical direction. Due to the fluctuation of the voice coil 16, the speaker diaphragm 5 whose inner peripheral portion is connected to the voice coil 16 similarly vibrates in the vertical direction, and the sound is generated from the speaker 12 by moving the air. It has become.

  However, when the speaker diaphragm is formed by overlapping members having different properties such as woven fabric and paper, these members cannot be integrated. As a result, it is difficult for the speaker diaphragm having such a configuration to maximize the high Young's modulus of the woven fabric layer fixed with the thermosetting resin and the large internal loss of the paper layer, thereby improving the sound quality of the speaker. However, it was not enough.

  Therefore, in the speaker diaphragm 5 of the present embodiment, as shown in FIG. 2, the pulp fluff 7 a of the paper layer 7 filled in the stitches 10 of the woven fabric layer 6 is woven on the surface side of the woven fabric layer 6. The woven yarn 9 of the layer 6 is entangled and fixed with a thermosetting resin.

  In this way, when the speaker diaphragm 5 having a configuration in which the fluff 7a of the pulp is filled into the stitch 10 of the woven fabric layer 6 and entangled with the woven yarn 9 from the surface side of the woven fabric layer 6, the speaker 12 is used. The sound quality can be improved.

  First, as compared with the conventional speaker diaphragm 4 shown in FIGS. 9A and 9B, the speaker diaphragm 5 has more pulp with large internal loss in the stitches 10 of the woven fabric layer 6. This is because it is filled and a large internal loss can be obtained.

  Furthermore, in the speaker diaphragm 5 according to the present embodiment, the two-layer structure of the paper layer 7 and the woven fabric layer 6 formed of fine linear fibers, and the fluff of the paper layer 7 fibers that have entered the stitch 10. 7a has a configuration in which the warp yarn 8a and the weft yarn 8b of the woven fabric layer 6 are entangled from the front surface side of the woven fabric layer 6, so that generally only the back surface side of the woven fabric layer 6 is bonded to the paper layer 7 layer. Unlike the conventional speaker diaphragm 4 having the configuration, the woven fabric layer 6 and the paper layer 7 are integrated. As a result, the strength of the speaker diaphragm 5 is increased, and the Young's modulus of the speaker diaphragm 5 is higher than that of the conventional speaker diaphragm 4, so that the sound quality is improved.

  As described above, the speaker diaphragm 5 according to the present embodiment can increase internal loss and Young's modulus, and can improve the sound quality of the speaker 12. Further, as described above, in the speaker diaphragm 5 of the present embodiment, the woven fabric layer 6 and the paper layer 7 can be bonded with a sufficient bonding force, and therefore the woven fabric layer 6 and the paper layer 7 are peeled off. The possibility of doing so can be very low.

  Further, as the thermosetting resin contained in the woven fabric layer 6, 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 5 and increase the Young's modulus of the speaker diaphragm 5.

  Further, aramid fibers may be mixed in the paper layer 7. Thus, when a hard aramid fiber is mixed in the paper layer 7, the strength of the speaker diaphragm 5 can be increased, and the hardness of the speaker diaphragm 5 is increased accordingly, so the Young's modulus is further increased. be able to. When aramid fibers are mixed in the paper layer 7 and aramid fibers are used for the woven fabric layer 6, the entire speaker diaphragm 5 is composed of aramid fibers, and a higher Young's modulus can be obtained.

  Similarly, as the woven fabric layer 6, it is desirable to use a woven fabric containing at least one of high-hardness fibers such as aramid fiber, polyester fiber, acrylic fiber, cotton fiber, carbon fiber, glass fiber, and silk fiber. . If the woven fabric containing these fibers is used, the hardness of the woven fabric layer 6 can be improved, and the Young's modulus of the speaker diaphragm 5 can be increased.

  Hereinafter, a method for manufacturing the speaker diaphragm 5 will be described.

  FIG. 4 shows a molding machine composed of a first mold 22 and a second mold 23 for forming the speaker diaphragm 5.

  The first mold 22 has a truncated cone shape having a mold protruding downward, and the second mold 23 is fitted with the truncated cone shape of the first mold 22. It has a dish shape. Although not shown in the drawings, the first mold 22 and the second mold 23 are provided with heaters for heating.

  Such a first mold 22 and a second mold 23 are prepared. First, the first mold 22 is pulled upward in the second mold 23.

  Next, a dish-shaped papermaking screen 24 is placed on the second mold 23.

  As shown in FIG. 5, the paper making screen 24 is in a state where the pulp that is the raw material of the paper layer 7 is scooped up from the pulp solution, and a pulp accumulation layer 25 is formed on the paper making screen 24 by the pulp. . At this time, the thickness of the pulp accumulation layer 25 is approximately 10 mm. In this state, the heater for heating the second mold 23 is driven to heat and evaporate the moisture contained in the pulp accumulation layer 25. Here, since the first mold 22 is not pushed down, the pulp deposit layer 25 is not compressed by the first mold 22 and the second mold 23. That is, the pulp accumulation layer 25 is heated and dried in a non-pressurized state. In the present embodiment, only the heater for heating attached to the second mold 23 is driven, but not only the heater for heating embedded in the second mold 23 but also the first mold. The heater for heating attached to 22 may be driven simultaneously. Alternatively, the pulp accumulation layer 25 may be dried with warm air such as a dryer, or may be naturally dried without driving a heater for heating.

  As described above, when the pulp accumulation layer 25 is heated and dried in a non-pressurized state, the pulp accumulation layer 25 is dried while being scooped up from the pulp solution. The pulp on the surface of the deposited layer 25 facing the first mold 22 has a large number of fluff 25a and is in a fluffy state.

  In this embodiment, the pulp in the pulp accumulation layer 25 is further fluffed by lightly applying a wire brush or the like to the pulp accumulation layer 25 after drying.

  Next, as shown in FIG. 7, the flat woven fabric 26 before being embossed is a second mold in which the first mold 22, the pulp accumulation layer 25, and the papermaking screen 24 are placed. It arrange | positions between the type | molds 23. FIG. The flat woven fabric 26 is a member corresponding to the woven fabric layer 6 after molding, and is formed by weaving yarns in a lattice shape. The flat woven fabric 26 is pre-impregnated with a thermosetting resin containing at least one of a phenol resin, an acrylic resin, an epoxy resin, and a vinyl ester resin thermosetting resin.

  From this state, as shown in FIG. 8, the first mold 22 is pushed down to the second mold 23, and the pulp accumulation layer 25 and the flat woven fabric 26 are pressurized and compressed. At this time, since the pulp of the pulp accumulation layer 25 is in a fluffy state, the fluff 25a shown in FIG. 6 enters the stitch of the flat woven fabric 26 and protrudes from the surface of the flat woven fabric 26. And then compressed.

  That is, the pulp accumulation layer 25 and the flat woven fabric 26 are clamped in a state where the fluff 25a of the pulp accumulation layer 25 is filled with the stitches of the flat woven fabric 26.

  At this time, the pulp accumulation layer 25 and the flat woven fabric 26 are deformed by pressure and compression, and the shapes of the paper layer 7 and the woven fabric layer 6 of the speaker diaphragm 5 shown in FIG. It becomes.

  Further, in a state where the pulp accumulation layer 25 and the flat woven fabric 26 are clamped, the first mold 22 and the second mold 23 are heated to 180 degrees to 250 degrees to impregnate the flat woven cloth 26. The cured thermosetting resin is thermoset to integrate the pulp accumulation layer 25 and the flat woven fabric 26. Thereafter, the first mold 22 and the second mold 23 are opened, the molded speaker diaphragm 5 is taken out, and the papermaking screen 24 is peeled off. In this embodiment, the mold is clamped in a state where the pulp accumulation layer 25 and the papermaking screen 24 are placed on the second mold 23. However, after the pulp accumulation layer 25 is dried by heating, the papermaking screen 24 is peeled off to form a flat woven fabric. Only 26 and the pulp accumulation layer 25 may be clamped.

  Through the above steps, the speaker diaphragm 5 shown in FIGS. 1A and 1B and FIGS. 2A and 2B is formed.

  Thus, according to the manufacturing method of the present embodiment, the fluff 25a on the surface of the pulp accumulation layer 25 facing the first mold 22 is filled into the stitches of the flat woven fabric 26, and the surface of the flat woven fabric 26 is thus obtained. Can be compression-molded in a state of protruding from the surface, and the thermosetting is performed by entwining the fluff 7a around the woven yarn 9 from the surface side of the woven fabric layer 6 as shown in FIGS. 1 (a) and 1 (b). It is possible to form the speaker diaphragm 5 which is fixed with resin.

  Further, after the pulp accumulation layer 25 is dried, the pulp accumulation layer 25 may be fluffed by brushing with a wire brush or a coarse paper basket. In this way, if the pulp accumulation layer 25 is further fluffed, more fluff 25a can enter into the texture of the flat woven fabric 26, and the paper layer in the stitch 10 in the speaker diaphragm 5 after manufacture. 7 can be increased, and the fluff 7a of the paper layer 7 can be entangled with the woven yarn 9.

  In addition, in order to make the pulp accumulation layer 25 fluffy, the pulp that is the raw material of the paper layer 7 has fibers having a fibril structure such as animal hair fibers such as wool, bast fibers such as hemp, and seed hair fibers such as cotton and kapok. May be mixed. That is, when fibers having a structure in which ultrafine fiber elements are bundled like a fibril structure are mixed, the fibers are cracked during drying, and the pulp accumulation layer 25 is further fluffed, and more fluff 25a is removed. The woven fabric of the flat woven fabric 26 can be made to enter. Furthermore, if the pulp mixed with the fiber having the fibril structure is brushed with a wire brush or a coarse paper basket, it can be made more fluffy.

  The speaker diaphragm according to the present invention has a configuration in which the fluff of the paper layer is entangled with the weaving yarn from the surface side of the woven fabric layer and fixed with a thermosetting resin, and the paper layer and the woven fabric layer are integrated. The internal loss and Young's modulus of the speaker diaphragm can be increased. Therefore, the speaker diaphragm according to the present invention can improve the sound quality of the speaker and is useful in various acoustic devices.

(A) The perspective view which shows the diaphragm for speakers of one Embodiment of this invention, (b) The principal part enlarged view of the diaphragm for speakers of one Embodiment of this invention. (A) Electron micrograph showing a cross section of the speaker diaphragm of one embodiment of the present invention, (b) Cross section of the speaker diaphragm of one embodiment of the present 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 of the raw material 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. (A) Electron micrograph showing a cross section of a conventional speaker diaphragm, (b) Cross section of a conventional speaker diaphragm

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Speaker diaphragm 6 Woven fabric layer 7 Paper layer 7a Fluff 8a Warp yarn 8b Weft yarn 9 Woven yarn 10 Knitting 12 Speaker 13 Magnetic gap 14 Magnetic circuit 15 Conductor 16 Voice coil 17 Frame 18 First edge 19 Dust cap 20 Leader line 21 Second edge 21a Suspension holder 22 First mold 23 Second mold 24 Papermaking screen 25 Pulp deposit layer 25a Fluff 26 Flat woven fabric

Claims (12)

A woven fabric layer,
A paper layer having fluff on the surface on the side in contact with the back surface of the woven fabric layer ,
The fluff enters the stitches of the woven fabric layer and protrudes from the surface of the woven fabric layer;
A speaker diaphragm integrated by being intertwined with the woven fabric layer on the surface of the woven fabric layer . The speaker diaphragm according to claim 1, wherein the woven fabric layer includes a thermosetting resin in a thermosetting state. 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 included in the woven fabric layer. The speaker diaphragm according to claim 1, wherein aramid fibers are mixed in the paper layer. The speaker diaphragm according to claim 1, wherein the woven fabric layer contains at least one of aramid fiber, polyester fiber, acrylic fiber, cotton fiber, carbon fiber, glass fiber, and silk fiber. A speaker using the speaker diaphragm according to any one of claims 1 to 5 . A speaker using the speaker diaphragm according to any one of claims 1 to 5,
The speaker diaphragm;
A frame coupled to the speaker diaphragm;
A magnetic circuit body held in the center of the inner portion of the frame;
Voice coil movably arranged in the magnetic gap formed by this magnetic circuit body
A speaker composed of A speaker using the speaker diaphragm according to any one of claims 1 to 5,
The speaker diaphragm;
A frame coupled to the speaker diaphragm;
A magnetic circuit body held in the center of the inner portion of the frame;
A voice coil movably disposed in a magnetic gap formed by the magnetic circuit body.
And a speaker in which the lattice pattern of the woven fabric layer is exposed on the surface of the speaker. Manufactured by a molding machine having a first mold and a second mold provided opposite to the first mold and provided so as to be aligned with the first mold. that, and a paper layer having a fluff on the surface of the side in contact with the back surface of the fabric layer and the fabric layer, wherein the fluff, protrudes from the surface of the fabric layer enters the stitches of the fabric layer, A speaker diaphragm configured to be integrated by being entangled with the woven fabric layer on the surface of the woven fabric layer ,
Before the speaker diaphragm is formed by thermocompression bonding with the first mold and the second mold, the pulp used as the raw material of the paper layer is scooped with a papermaking screen, and the pulp of the paper layer is removed. A diaphragm for a speaker dried under pressure. The speaker diaphragm according to claim 9 , wherein the pulp on the side in contact with the woven fabric layer is fluffed during or after the pulp is dried. The speaker diaphragm according to claim 10 , wherein the pulp is fluffed by brushing. The speaker diaphragm according to claim 9 , wherein fibers having a fibril structure are mixed in the pulp.