JP2006333517A - Method of manufacturing speaker diaphragm, speaker diaphragm manufactured thereby, and speaker with the diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently dry a diaphragm formed from paper using pulp regarding a speaker diaphragm manufacturing method of a speaker mainly used for various audiovisual equipment. <P>SOLUTION: The present invention relates to a speaker diaphragm manufacturing method for drying a speaker diaphragm 35 deposited on a hollow pulp mold 22, the hollow pulp mold 22 falling on its face and depositing fused pulp is disposed within a dryer 36, and the diaphragm is dried by scattering moisture of the fused pulp by rotating the hollow pulp mold and depositing the pulp thereon in the state of pressurizing air from the upside. The speaker diaphragm suppressing deformation of the speaker diaphragm or of pulp fibers can be provided while reducing energy consumption. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a speaker diaphragm for a speaker used in various audiovisual equipment, a speaker diaphragm manufactured by the manufacturing method, and a speaker using the speaker diaphragm.

  The prior art will be described with reference to a side sectional view of the speaker shown in FIG. 6 and a schematic view of the structure of a paper making apparatus which is a manufacturing apparatus of a diaphragm which is a main part of FIG. According to the figure, reference numeral 1 is composed of a lower plate 1a having a center pole, an annular magnet 1b, and an upper plate 1c superposed thereon, and a magnetic gap 1d is provided between the center pole and the inner periphery of the upper plate 1c. 2 is a frame that is adhesively bonded to the upper plate 1c, 3 is an outer periphery that is adhesively bonded to the frame 2 via an edge 3a, and an inner periphery is fitted into the magnetic gap 1d. The cone-shaped speaker diaphragm is adhesively bonded to the voice coil 4, and 5 is a damper that supports the voice coil 4 so that it can move up and down by bonding the inner periphery to the voice coil 4 and the outer periphery to the frame 2. It is.

  The speaker diaphragm 3 may be made of plastic or a thin metal plate, but the physical properties, price, material, etc., which are basically required for the speaker diaphragm, such as the size of internal loss and the rigidity, etc. From the viewpoint of ease of sound production by blending various pulp materials, it is common to use paper made as a diaphragm for speakers.

  The manufacturing method of the speaker diaphragm formed by this papermaking will be described with reference to FIG. 7. 11 is a papermaking tank for supplying the beaded molten pulp to a papermaking mold to be described later, 12 is a papermaking mold made of wire mesh, and 13 is A measuring tank for raw pulp dispersed in water, 14 is a supply pipe, and 15 is a valve for opening and closing the flow path. 16 is a water injection pipe for diluting the pulp liquid, 17 is a flow path opening / closing valve, 18 is a drain pipe, and 19 is a valve.

  In the paper making process by the above apparatus, water is first supplied from the dilution water injection pipe 16, and the pulp raw material measured in the measuring tank 13 is supplied to the paper making tank 11 when the water level exceeds the paper making mold 12. The liquid in the papermaking tank 11 is stirred by the stirring means 10 made of air or other methods.

  Thus, after a fixed amount of raw material and dilution water are supplied into the papermaking tank 11 and uniformly stirred, the pulp raw material in the papermaking tank 11 gradually begins to settle on the papermaking mold 12. In order to perform this process in a short time, it is common to drain water from the drain pipe 18 rapidly. This method is called a scraping method. At this time, a vortex is generated in the vicinity of the drain outlet of the papermaking tank 11, and the pulp accumulates on the papermaking mold 12 while rotating with a water flow formed by the vortex in the papermaking tank 11. This is taken out and dried, and the center hole and the outer peripheral portion are removed to obtain the speaker diaphragm 3 of FIG.

  On the other hand, it is only seen in the production of Japanese paper, but there is a traditional method of hand-making, and this is done by placing a net in a water tank and moving it finely from side to side and up and down to adjust the thickness and orientation. There is also a so-called paper-making method that pulls up the net from the surface of the water while making it with craftsmanship.

  Also, the speaker diaphragm that has been made paper is dried to become the original speaker diaphragm. Natural drying is ideal for the formation of the speaker diaphragm. It is common to carry out efficiently by using a press and a flame individually or in combination.

  As described above, the speaker diaphragm 3 using pulp is inexpensive, can be blended with various pulps, and easily obtains desired acoustic characteristics. Consumption reduction is required.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems and makes it possible to provide a speaker diaphragm manufacturing method capable of providing an excellent speaker diaphragm, a speaker diaphragm using the same, and a speaker using the same. It is.

  In order to solve the above problems, a speaker diaphragm manufacturing method of the present invention is a speaker diaphragm manufacturing method for drying a speaker diaphragm deposited on a papermaking mold, and is substantially contained in a sealed container. Placed on a rotating disc with an opening in the center, a prominent papermaking mold with molten pulp deposited, and sprinkled moisture from the molten pulp deposited by rotating in a pressurized state of air from above. The speaker diaphragm that suppresses the deformation of the speaker diaphragm and the deformation of the pulp fiber can be provided with less energy consumption.

  As described above, the speaker diaphragm manufacturing method of the present invention can provide a stable speaker diaphragm with good reproducibility and energy saving, and can be provided with high productivity.

  Embodiments of the present invention will be described below.

  Hereinafter, an embodiment of the speaker of the present invention will be described with reference to FIGS. In the description, the same parts as those in the prior art will be denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1)
FIG. 1 is a structural schematic diagram of a paper making apparatus used in the speaker diaphragm manufacturing method of the present invention, FIG. 2 is a structural schematic diagram of the same development example, and FIGS. 3 (a) and 3 (b) are the same. FIG. 4 is a plan view of a water flow control slit plate as a main part, and FIG. 4 is a structural cross-sectional view of a drying apparatus for a speaker diaphragm after paper making.

  First, the paper making of the speaker diaphragm will be described with reference to FIG.

  According to the figure, 21 is a papermaking tank for depositing the melted pulp after beating on a papermaking mold to be described later, 22 is a papermaking mold made of a wire mesh, 23 is a measuring tank for raw pulp dispersed in water, 24 Is a supply pipe, and 25 is an air flow path for stirring. 26 is a dilution water pipe for diluting water injection for diluting the pulp liquid, 27 is a flow path opening / closing valve, and 29 is a valve of the dilution water pipe.

  Reference numeral 21a denotes a cylindrical syringe having a planar area size equal to or larger than the planar area of the papermaking mold 22 provided in the lower part of the papermaking tank 21, and this syringe 21a includes this syringe. A plunger 21b is provided which is driven to move up and down while being in close contact with the inner wall of 21a. The plunger 21b is configured to move up and down by a hollow rod 21d provided with a drain valve 21c at the lower end.

  Next, papermaking in this papermaking apparatus will be described. That is, raw material pulp after beating, in which the raw material is melted with the plunger 21b at the upper limit, is fed from the measuring tank 23, and dilution water is made from the dilution water pipe 26, respectively. It is supplied to the tank 21 and stirred by injecting air from the stirring air flow path.

  After stirring, the raw pulp gradually begins to deposit on the papermaking mold 22 due to its own weight. At this time, the plunger 21b in the syringe 21a corresponding to the bottom plate of the papermaking tank 21 is lowered so that water in the papermaking tank 21 accumulates pulp on the papermaking mold 22, and only water passes through the net-like papermaking mold 22. Then, it is sucked into the syringe 21a to make paper. At this time, since the entire cross section of the water moving through the net is uniformly lowered by the lowering of the syringe 21a, the local water flow is not disturbed.

  This is due to the fact that the syringe 21a has a cross-sectional area equal to or larger than that of the papermaking mold, and the accumulation of pulp is close to the natural fall, and the vortex of the drainage generated in the conventional apparatus during papermaking, etc. It is possible to suppress the influence on the pulp orientation. Further, by lowering the syringe 21a, the pulp accumulation speed is improved as compared with the natural fall to improve the productivity of the papermaking, and for the speaker obtained by the papermaking even if the size of the papermaking tank 21 between the papermaking apparatuses is different. The variation of the diaphragm is extremely small, which is useful for the stable supply of the diaphragm for the speaker.

  FIG. 2 is a structural schematic diagram of a paper making apparatus according to a development example of the present embodiment, and FIGS. 3A and 3B are plan views of a water flow control slit plate as a main part.

Only the differences from the present embodiment will be described with reference to the figure. Reference numeral 31 denotes a water flow control slit plate provided between the syringe 21a between the plunger 21b and the papermaking mold 22, and the plunger 21b as in the present embodiment. The syringe 21a provided on the paper is lowered to eliminate variations due to paper drainage between the paper making apparatuses, and the slit shape of the water flow control slit plate 31 is a ring shape near the outer periphery as shown in FIG. Or in a plus shape as shown in FIG. 3B, the water flow is changed to control the orientation of the pulp, and the acoustic characteristics of the speaker diaphragm can be controlled.

  As described above, in the above-described embodiment, the flow caused by drainage cannot be performed in the same manner as that of the traditional Japanese paper hand-rolling method, and the orientation due to the drainage of pulp is suppressed, It is possible to provide a method for manufacturing a speaker diaphragm having a high industrial productivity.

  In addition, since a papermaking method that is not affected by the water flow caused by slightly different drainage for each papermaking apparatus can be realized as described above, it is possible to arbitrarily select the waterflow control slit plate 31 having various shapes on the upper surface of the syringe 21a. It is also possible to produce a loudspeaker diaphragm having characteristics that are impossible with conventional methods by creating a water flow and partially changing the orientation of the pulp.

  Next, drying after paper making will be described.

  FIG. 4 is a structural sectional view of a speaker diaphragm drying apparatus according to another embodiment of the speaker diaphragm manufacturing method of the present invention.

  According to the figure, 35 is a speaker diaphragm made on the papermaking mold 22 and is taken out from the papermaking apparatus described in the first embodiment, and 36 is a pipe of compressed air at the upper center. This is a drying device comprising a rotating disk 36c having an upper cover 36a connected to 36d and an opening 36b to which the papermaking mold 22 is attached.

  Next, the operation will be described. The paper-made speaker diaphragm 35 obtained in the first embodiment is attached to the rotating disk 36c together with the paper-making mold 22, and is rotated at a high speed after the upper lid 36a is attached. Are separated and dried. At this time, in order to prevent the outer peripheral portion of the cone-shaped speaker diaphragm from floating due to rotation by the compressed air pressure, it is dried and deformed (in the worst case, the speaker diaphragm is scattered at high speed). In addition, it is intended to hold the shape by pressing against the papermaking mold 22.

  In the opening 36b of the rotating disk 36c, the compressed air passes through a rough portion inside the speaker diaphragm 35 and accumulates below the speaker diaphragm 35. The air pressure in this portion increases, and the compressed air In order to prevent the effect of holding the speaker diaphragm 35 on the papermaking mold 22 from being reduced, an opening is provided to make the lower part of the speaker diaphragm 35 substantially equal to the atmospheric pressure.

  In the drying apparatus, it was confirmed that the speaker diaphragm was dried when the rotational speed was 500 to 1800 r / min and the compressed air pressure was 0.2 to 0.8 MPa. In consideration of the dynamic balance and the economics of the compressed air pressure that is used in general, it is desirable that the rotational speed is about 1000 to 1500 r / min and the compressed air pressure is about 0.3 to 0.5 MPa.

  Moreover, in the said embodiment, although the manufacturing method of the diaphragm for speakers by the centrifugal dehydration by rotation was demonstrated, you may use the hot air drying conventionally performed after the drying by centrifugal dehydration. However, even when a conventional drying method such as hot air drying is used as described above, since most of the moisture inside the speaker diaphragm is removed by centrifugal dehydration, it is not necessary to heat the speaker diaphragm excessively. The pulp of the diaphragm is not deteriorated.

  As described above, in the present embodiment, the pulp of the speaker diaphragm due to heating does not deteriorate like the conventional speaker diaphragm, and the drying time can be greatly shortened than the drying by heating. In addition, the use of a heat source can be reduced, and energy consumption can be greatly reduced.

  In addition, the conventional method involves lot work using a large dryer, but an automatic drying line can also be achieved, contributing to an improvement in productivity.

  In the present embodiment, the speaker diaphragm on the papermaking mold in the present embodiment has been described as being used. However, the present invention can also be applied to a speaker diaphragm obtained by a conventional papermaking method. Even in this case, the same effect can be obtained.

  Further, the drying method based on the dehydration by centrifugation according to the above-described embodiment can be applied to a paper container whose shape is previously formed by papermaking, and an extremely great effect can be expected in reducing energy consumption during drying.

(Embodiment 2)
An embodiment of the speaker of the present invention will be described mainly with respect to claims 2 and 3 with reference to a side sectional view of the speaker of FIG.

  The difference from the prior art will be described with reference to the figure. The difference is the speaker diaphragm, and the speaker is formed using the speaker diaphragm 35 obtained in the first embodiment.

  By adopting the above-described configuration, it is possible to provide a speaker with stable acoustic characteristics by adopting a homogeneous speaker diaphragm 35.

  Although the present invention has been described as using the speaker diaphragm on the papermaking mold formed in the first embodiment, the present invention is applied to the speaker diaphragm obtained by the conventional papermaking method. In this case, the same effect can be obtained.

Schematic diagram of the structure of a paper making apparatus used in the method for manufacturing a speaker diaphragm of the present invention Structural schematic diagram of the same example (A) The top view of one embodiment of the water flow control slit plate which is the same main part, (b) The top view of the other embodiment of the water flow control slit plate which is the same main part. Cross-sectional view of the structure of a speaker diaphragm drying apparatus according to another embodiment of the speaker diaphragm manufacturing method of the present invention Side sectional view of one embodiment of the speaker of the present invention Side view of a conventional speaker Schematic diagram of the structure of a paper making machine, which is a manufacturing apparatus for the speaker diaphragm, which is the main part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 1d Magnetic gap 2 Frame 3a Edge 4 Voice coil 21 Papermaking tank 21a Syringe 21b Plunger 22 Papermaking type 31 Water flow control slit board 35 Speaker diaphragm 36b Opening part 36c Rotating disk 36d Compressed air pipe

Claims (3)

A method for producing a speaker diaphragm that dries a speaker diaphragm deposited on a papermaking mold, and is a prone papermaking method in which molten pulp is deposited on a rotating disk having an opening in the center in a sealed container. A method for manufacturing a diaphragm for a speaker, in which a mold is disposed and rotated in a pressurized state of air from above to disperse and dry the accumulated molten pulp. A speaker diaphragm manufactured using the speaker manufacturing method according to claim 1. At least a magnetic circuit, a frame adhesively bonded to the magnetic circuit, an outer periphery is adhesively bonded to the frame via an edge, and an inner periphery is adhesively bonded to a voice coil having a lower portion fitted in the magnetic gap of the magnetic circuit A speaker comprising the speaker diaphragm according to claim 2.

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