JP2007194828A - Vibration body for speaker system, and the speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration body etc., for speaker system that is suitably used for a vehicle-mounted and high-power type speaker system. <P>SOLUTION: A diaphragm as an example of the vibration body for speaker system has a thermoplastic resin expanded body of expanded acrylic resin etc., consisting principally of meta-methyl acrylate and meta-acrylic acid and a prepreg molding formed by sticking a bonding element on its one surface, and a plurality of through holes are provided in the thermoplastic resin expanded body. Consequently, even when the prepreg molding and thermoplastic resin expanded body are stuck together across the bonding element in the manufacturing stage, air included during the sticking and gas discharged from bubbles in the thermoplastic resin expanded body as the thermoplastic resin expanded body is compressed are discharged to the outside through the plurality of through holes. Consequently, the sheet-type member is prevented from floating over the thermoplastic resin expanded body and therefore suitably used for the vehicle-mounted and high-power type speaker system. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a layer structure of a vibrating body for a speaker device.

  In recent years, in-vehicle speaker devices and the like have been increased in power, and accordingly, a speaker device vibrating body such as a diaphragm and a cap is required to have high rigidity. In particular, in the case of such a speaker device, since the summer is placed in a high temperature environment, the winter is placed in a low temperature environment. Therefore, the vibration body for the speaker device used for this is resistant to such a severe environment. It is preferable to have the structure obtained.

  Patent Documents 1 and 2 disclose speaker device diaphragms having a multilayer structure in order to achieve high rigidity or strength improvement.

  The diaphragm for a speaker device described in Patent Document 1 has a core layer having a poly (meth) acrylimide foam and at least one coating layer, and is molded by compressing them under predetermined conditions. It becomes. Thereby, it has the outstanding intensity | strength and it is supposed that especially a coating layer has high peelability.

  On the other hand, in Patent Document 2, two types of base materials with different amounts of resin impregnation are used, and a base material with a large amount of impregnation is superimposed on a portion to be a diaphragm on a base material with a small amount of impregnation. And a speaker device diaphragm formed by forming an inorganic compound such as an inorganic metal or a diamond film on a diaphragm portion impregnated with a high-rigidity polymer resin. Yes. Thereby, it is supposed that the rigidity of a diaphragm can be improved.

JP-T-2004-537243 JP-A-8-19092

  An object of the present invention is to provide a vibration body for a speaker device that can be suitably used for a vehicle-mounted and a high-power type speaker device, and a speaker device using the same.

  The invention according to claim 1 is a vibration body for a speaker device, comprising: a thermoplastic resin foam; and a sheet-like member bonded to at least one surface of the thermoplastic resin foam, The thermoplastic resin foam is characterized in that at least one or more through holes are provided.

  In one embodiment of the present invention, a speaker device vibrator includes a thermoplastic resin foam and a sheet-like member bonded to at least one surface of the thermoplastic resin foam, and the thermoplastic The resin foam is provided with at least one through hole.

  The vibrating body for a speaker device includes a thermoplastic resin foam as a core material and a sheet-like member bonded to at least one surface of the thermoplastic resin foam, and has a multilayer structure. Make. In addition, as a vibration body for speaker apparatuses, vibration system members, such as a diaphragm for speaker apparatuses and a cap for speaker apparatuses, are mentioned.

  Here, the thermoplastic resin foam is preferably a foamed acrylic resin mainly composed of methyl methacrylate and methacrylic acid. Moreover, it is preferable that the said sheet-like member is a prepreg molded body formed by heating and pressurizing a prepreg formed by impregnating a sheet-like cloth material with a resin into a predetermined shape. In the sheet-like member, the fibers constituting the cloth material are preferably carbon fibers, and the resin is any one of a vinyl ester resin, an epoxy resin, and an acrylic resin. preferable. In addition, the sheet-like member is preferably bonded to at least one surface of the thermoplastic resin foam via an adhesive element, and the adhesive element has a property of being thermally reactivated by a heating type press device. More preferably, it is a rubber-based adhesive containing a phenol resin or a nylon-based laminate film. Further, a sheet-like resin film may be used for the sheet-like member.

  In particular, in this vibration body for a speaker device, the thermoplastic resin foam is provided with at least one through hole.

  As a result, even when a sheet-like member such as a prepreg molded body or a resin film and a thermoplastic resin foam are bonded to each other through an adhesive element in the manufacturing process of the vibration body for a speaker device, it is caught at the time of the bonding. The vibration generated for the speaker device through the at least one or more through-holes of the thermoplastic resin foam is caused by the compressed air or the gas that is generated from the bubbles in the thermoplastic resin foam by the compression of the thermoplastic resin foam. It is discharged outside the body. That is, when the sheet-like member and the thermoplastic resin foam are bonded together, such air and gas do not accumulate between the two. Accordingly, it is possible to prevent the sheet-like member from being lifted from the thermoplastic resin foam, that is, from being peeled off. In other words, the adhesion between the sheet-like member and the thermoplastic resin foam is increased.

  In addition, when the vibration body for a speaker device having a structure in which air or gas remains between the sheet-like member and the thermoplastic resin foam is placed in a high temperature environment, the air or gas remaining between the two is left. Expands, and the sheet-like member is lifted from the thermoplastic resin foam, that is, peeled. In particular, the latter problem is a fatal problem for a vehicle-mounted speaker device that is placed in a high-temperature environment by direct sunlight or a sub-woofer in which a high power is advanced and the speaker box is in a high temperature state.

  However, this type of vibration device for speaker devices does not cause such a problem, so that the in-vehicle speaker device that is placed in a high temperature environment by direct sunlight or the high power is advanced and the inside of the speaker box is in a high temperature state. It can be suitably used for the subwoofer.

  In a preferred example, the diameter of the through hole provided in the thermoplastic resin foam is preferably set to φ0.5 mm to φ20 mm. This is due to the following reason. In other words, since the thermoplastic resin foam has a certain degree of curability due to its properties, if the diameter of the through hole provided in the thermoplastic resin foam is smaller than φ0.5 mm, the needle for forming the through hole is This is because the mass productivity of the vibrating body for the speaker device is lowered due to bending or bending. On the other hand, when the diameter of the through hole of the thermoplastic resin foam is larger than φ20 mm, the strength as the vibration body for the speaker device is weakened and cannot be suitably used as the vibration body for the speaker device.

  Further, when a plurality of through holes are set in the thermoplastic resin foam, each through hole is preferably provided at a constant interval, and further, the outer peripheral edge from the center of the thermoplastic resin foam It is preferable that it is provided in a lattice shape toward the part. Thereby, it is possible to easily discharge air and gas generated when the sheet-like member and the thermoplastic resin foam are bonded to each other through the plurality of through holes of the thermoplastic resin foam to the outside of the vibration body for the speaker device. Because.

  In one aspect of the above speaker device, a woven fabric or a nonwoven fabric is provided between the thermoplastic resin foam and the sheet-like member, and the woven fabric or the nonwoven fabric comprises the thermoplastic resin and the sheet-like member. It is pasted together.

  In this aspect, a woven or non-woven fabric is provided between the thermoplastic resin foam and the sheet-like member, and the woven or non-woven fabric is bonded to the thermoplastic resin and the sheet-like member via, for example, the above-described adhesive element. Therefore, the adhesion between the sheet-like member and the thermoplastic resin foam can be improved.

  Therefore, the sheet-like member can be made more difficult to peel from the thermoplastic resin foam. In addition, since the woven fabric or non-woven fabric has a gap in the inside thereof, the above-described air and gas generated when the sheet-like member bonded to the woven fabric or non-woven fabric is bonded to the thermoplastic resin foam is the thermoplastic resin foam. Not only is it discharged outside through at least one or more through-holes in the body, but part of the air and gas is also absorbed by the woven or non-woven fabric. Thereby, unnecessary air and gas do not accumulate between the sheet-like member and the thermoplastic resin foam, and the sheet-like member can be prevented from being lifted from the thermoplastic resin foam, that is, separated.

  In a suitable example, carbon fiber, glass fiber, aramid fiber, polyester fiber, PBO fiber, cotton yarn etc. can be used as a constituent material of a woven fabric or a nonwoven fabric, for example.

  In this case, in this aspect, first, the sheet-like member and the woven or non-woven fabric are bonded together by an adhesive element, and then the composite member formed by the bonding and the thermoplastic resin foam are bonded together by the adhesive element. Can be produced.

  In another embodiment of the present invention, a speaker device including the above-described speaker device vibration body can be configured. Thereby, it can use suitably as a subwoofer for vehicle installation etc. which are put on a severe environment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The present invention can be suitably applied to various vibration system members constituting the speaker device, for example, a speaker device vibrating body such as a speaker device diaphragm or a speaker device cap.

[Configuration of diaphragm for speaker device]
Hereinafter, the configuration and the like of a speaker device diaphragm (hereinafter simply referred to as a “diaphragm”) as an example of a speaker device vibration body according to an embodiment of the present invention will be described. In the present invention, the shape and size of the diaphragm are not limited to the forms described below.

  FIG. 1A is a cross-sectional view showing the layer structure of the diaphragm, and shows a state where each element is separated. FIG.1 (b) shows the top view of the thermoplastic resin foam used as the component of a diaphragm when observed from the radiation | emission direction of a sound.

  The diaphragm 10 has a dome shape, a thermoplastic resin foam 11 having a function as a core material (core material), and a prepreg molded body 12 that is bonded to at least one surface via an adhesive element 70. The thermoplastic resin foam 11 is characterized in that at least one (9 in this example) through-holes 11a are provided.

  As a base material of the thermoplastic resin foam 11, it is preferable to use, for example, a foamed acrylic resin mainly composed of methyl methacrylate and methacrylic acid, or polypropylene, polyethylene, polystyrene, polyester, or the like.

  The diameter d1 of the through hole 11a is preferably set to φ0.5 mm to φ20 mm. This is due to the following reason. That is, since the thermoplastic resin foam 11 has a certain degree of curability in nature, if the diameter d1 of the through hole 11a provided in the thermoplastic resin foam 11 is smaller than φ0.5 mm, the through hole 11a This is because the mass productivity of the diaphragm 10 is lowered by bending or bending the forming needle. On the other hand, if the diameter d1 of the through hole 11a of the thermoplastic resin foam 11 is larger than φ20 mm, the strength as the diaphragm 9 is weakened and cannot be suitably used as the diaphragm.

  Moreover, when setting the some through-hole 11a in the thermoplastic resin foam 11, it is preferable that each through-hole 11a is provided in the fixed space | interval d2, and also the outer periphery from the center O It is preferably provided in a lattice shape toward the portion 11x.

  As the adhesive element 70, it is preferable to use, for example, a rubber-based adhesive containing a phenol resin or a nylon-based laminate film. This is because these adhesive elements 70 have the property of being thermally reactivated by heating and pressurizing, so that it is suitable for bonding the members finally formed in the sandwich structure using a heating type press device. It is.

  The prepreg molded body 12 is formed by impregnating a cloth material (cloth material) to be a prepreg with a resin, and molding the resin into a sheet using a heating type pressing device.

  Here, “prepreg” generally means an intermediate substrate (shape) for molding a composite material in which organic fibers, carbon fibers or inorganic fibers are impregnated with resin (thermosetting resin or thermoplastic resin) or pitch as a matrix. Which can be molded into a molded product by heating and pressurization.

  Examples of the fiber constituting the cloth material include carbon fiber, glass fiber, aramid fiber, polyester fiber, PBO (polyparaphenylene benzobisoxazole) fiber, and cotton yarn. Moreover, as resin for impregnation for making a prepreg, vinyl ester resin, an epoxy resin, an acrylic resin etc. can be used, for example.

  The diaphragm 10 having the above-described configuration is manufactured as follows. First, a foamed acrylic resin or the like mainly composed of methyl methacrylate and methacrylic acid is used as a core material, and this is formed into a predetermined shape, for example, a dome shape under a predetermined temperature and a predetermined pressure using a heating type press device. Mold and then cool. Thereby, the above-mentioned thermoplastic resin foam 11 is obtained. Next, as shown in FIG. 1, at least one or more through holes 11 a are formed in the thermoplastic resin foam 11.

  Next, a resin is impregnated into a sheet-like cloth material to be a prepreg, and this is molded into a dome shape using a heating type pressing device. Thereby, the above-described prepreg molded body 12 is obtained. In this embodiment, the manufacturing order of the thermoplastic resin foam 11 provided with at least one or more through holes 11a and the prepreg molded body 12 may be reversed.

  Next, as shown in FIG. 2, for example, a mold having a female mold 80 and a male mold 81 formed in a dome shape is prepared. Subsequently, the thermoplastic resin foam 11 having at least one or more through holes 11a is disposed on the male mold 81, and subsequently, the adhesive element 70 is applied or disposed on the upper side thereof, and then the adhesion is performed. The prepreg molded body 12 is arranged on the upper side of the element 70, and the constituent members of the diaphragm 10 are made up of the female mold 80 and the male mold 81 under a predetermined temperature and a predetermined pressure by using a heating type pressing device (not shown). Press. Thereby, the diaphragm 10 according to the above-described embodiment is obtained.

  The diaphragm 10 having the above-described configuration exhibits the following specific effects as compared with the comparative example described below.

  Here, it is assumed that the comparative example has a configuration in which the through hole 11a is not provided in the thermoplastic resin foam 11 in the diaphragm 10 according to the present embodiment.

  The prepreg molded body 12 has no or poor air permeability due to its structure. Therefore, in the manufacturing process of the diaphragm according to the comparative example, when the prepreg molded body 12 and the thermoplastic resin foam 11 are bonded together via the adhesive element 70, the air that is involved in the bonding or the thermoplastic resin When the foam 11 is compressed, the gas present in the bubbles in the thermoplastic resin foam 11 remains between the prepreg molded body 12 and the thermoplastic resin foam 11, and the following problems occur. Give rise to

  That is, the presence of air or gas causes poor adhesion between the prepreg molded body 12 and the thermoplastic resin foam 11, and the prepreg molded body 12 is lifted from the thermoplastic resin foam 11, that is, in a peeled state. End up. In addition, when the diaphragm according to the comparative example is placed in a high temperature environment, the remaining air or gas between the prepreg molded body 12 and the thermoplastic resin foam 11 expands, and the prepreg molded body 12. Will be lifted from the thermoplastic resin foam 11, that is, peeled off. In particular, the latter problem is a fatal problem for a vehicle-mounted speaker device that is placed in a high-temperature environment by direct sunlight or a sub-woofer in which a high power is advanced and the speaker box is in a high temperature state.

  In addition, the foamed acrylic resin as an example of the thermoplastic resin foam is light and rigid, and thus is used as a diaphragm for a speaker device. On the other hand, the foamed acrylic resin is easily broken and easily crushed. It also has the properties of Therefore, as a solution technique, usually, a coating material is provided on the surface of the foamed acrylic resin to improve the strength. However, when such a diaphragm is applied to an in-vehicle speaker device or a high-power speaker device that is used in a severe environment, the above-mentioned problems occur. It is usually difficult to use a prepreg molded product or a film material having no air permeability.

  In view of such problems, in this embodiment, the diaphragm 10 is bonded to the thermoplastic resin foam 11 having a function as a core material (core material) and at least one surface thereof via an adhesive element 70. In particular, the thermoplastic resin foam 11 is provided with at least one (9 in this example) through-holes 11a.

  Thereby, even when the prepreg molded body 12 and the thermoplastic resin foam 11 are bonded together via the adhesive element 70 in the manufacturing process of the diaphragm 10 according to the present embodiment, When the thermoplastic resin foam 11 is compressed, the gas emitted from the bubbles in the thermoplastic resin foam 11 is discharged to the outside of the diaphragm 10 through the through hole 11a of the thermoplastic resin foam 11. Is done. That is, when the prepreg molded body 12 and the thermoplastic resin foam 11 are bonded together, such air and gas do not accumulate between them. Therefore, the trouble like the above-mentioned comparative example does not occur, and it is possible to prevent the prepreg molded body 12 from being lifted from the thermoplastic resin foam 11, that is, separated. In other words, the adhesion between the prepreg molded body 12 and the thermoplastic resin foam 11 is increased.

  For this reason, the diaphragm 10 according to the present embodiment is preferably used for a vehicle-mounted speaker device that is placed in a high-temperature environment by direct sunlight, or a sub-woofer in which the power is increased and the speaker box is in a high-temperature state. it can.

  In a preferred example, the diameter d1 of the through hole 11a provided in the thermoplastic resin foam 11 is preferably set to φ0.5 mm to φ20 mm. Thereby, the effect mentioned above is acquired. Moreover, when setting the some through-hole 11a in the thermoplastic resin foam 11, it is preferable that each through-hole 11a is provided in the fixed space | interval d2, and also the outer periphery from the center O It is preferably provided in a lattice shape toward the portion 11x. As a result, air and gas generated when the prepreg molded body 12 and the thermoplastic resin foam 11 are bonded to each other can be easily discharged to the outside of the diaphragm 10 through the plurality of through holes 11 a of the thermoplastic resin foam 11. be able to.

[Modification]
In the present invention, a sheet-like resin film may be used instead of the sheet-like prepreg molded body 12 as a material for covering the surface of the thermoplastic resin foam 11 in the diaphragm 10. Here, as a resin material constituting the resin film, for example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), polyimide, polyetherimide, PEEK (polyetherketone), polyethersulfone, or the like is used. it can. Also in this case, the same effect as the above embodiment can be obtained.

  Moreover, in this invention, as shown to Fig.3 (a), the thermoplastic resin foam 11 and the prepreg molded object 12 (or the resin film which concerns on the said modification) {Hereinafter, it calls a "sheet-like member."} May be bonded by the adhesive element 70 via a woven fabric (or non-woven fabric) 13.

  Here, as a constituent material of the woven fabric (or non-woven fabric) 13, for example, carbon fiber, glass fiber, aramid fiber, polyester fiber, PBO fiber, cotton yarn and the like can be used.

  In this case, for example, such a vibration plate is obtained by bonding a sheet-like member and a woven fabric (or non-woven fabric) 13 with an adhesive element 70, and then bonding the composite member formed by the bonding and the thermoplastic resin foam 11. It can be produced by bonding with the element 70.

  Such a diaphragm provides the following operational effects.

  That is, since the sheet-like member is made of a material having a smooth surface, the adhesion between the sheet-like member and the thermoplastic resin foam 11 is poor. However, since the woven fabric (or non-woven fabric) 13 has a fine network structure, the sheet-like member and the thermoplastic resin foam 11 are adhered by interposing the woven fabric (or non-woven fabric) 13 therebetween. Can be improved. Therefore, the sheet-like member can be made more difficult to peel from the thermoplastic resin foam 11. Actually, an experiment on the peel resistance was carried out. However, when the sheet-like member was forcibly removed from the thermoplastic resin foam 11, the sheet-like member was damaged. .

  Since the woven fabric (or non-woven fabric) 13 has a gap in its structure, a sheet-like member bonded to the woven fabric (or non-woven fabric) 13 is bonded to the thermoplastic resin foam 11 via the adhesive element 70. The above-described air and gas are not only exhausted to the outside through the through hole 11a of the thermoplastic resin foam 11, but part of the air and gas is also absorbed by the woven fabric (or non-woven fabric) 13. . This prevents unnecessary air and gas from accumulating between the sheet-like member and the thermoplastic resin foam 11, and prevents the sheet-like member from being lifted from the thermoplastic resin foam 11, that is, separated. it can.

Moreover, in said Example and modification, it comprises so that a sheet-like member may be provided in the one surface side of the thermoplastic resin foam 11, or both a sheet-like member and woven fabric (or nonwoven fabric) 13 may be provided. However, the present invention is not limited to this, and a sheet-like member may be provided on both sides of the thermoplastic resin foam 11, or both the sheet-like member and the woven fabric (or non-woven fabric) 13 may be provided. .
An example of such a configuration is shown in FIG. In such a diaphragm, a sheet-like member in which a woven fabric (or non-woven fabric) 13 is bonded to one surface side of the thermoplastic resin foam 11 via an adhesive element 70 is bonded to the diaphragm. The other sheet-like member 14 is bonded to the other surface side of 11 through an adhesive element 70. Here, the other sheet-like member 14 can be made into the glass cloth molded object which consists of glass fiber formed by impregnating a phenol resin, for example.

[Confirmation test for prepreg molded product]
Next, on the diaphragm having each aspect described below, a confirmation test was performed for the presence or absence of lifting of the prepreg molded body under predetermined conditions.

  First, the basic configuration of such a diaphragm is as follows.

  The thermoplastic resin foam 11 as the core material of the diaphragm is a hot press device for a sheet-like base material having a thickness of 15 mm obtained by foaming a foamed acrylic resin mainly composed of methyl methacrylate and methacrylic acid ten times. Is formed into a dome shape. Depending on the test mode, the through-hole 11a is not provided in the thermoplastic resin foam 11 (no hole), or the through-hole 11a having a diameter of φ1.5 mm is arranged as shown in FIG. Nine are provided {φ1.5mm hole (9)}.

  The sheet-like member is obtained by impregnating a carbon cloth with a vinyl ester resin to form a prepreg, which is molded into a dome shape by a heating type pressing device (prepreg molded body 12). Then, on one surface side of the thermoplastic resin foam 11, the prepreg molded body 12 is bonded (no nonwoven fabric) or the prepreg molded body 12 is bonded via a nonwoven fabric made of carbon fiber, depending on the test mode. Match (with non-woven fabric). In this case, the prepreg molded body 12 and the nonwoven fabric are simultaneously molded by a heating type pressing device. Moreover, the thermoplastic resin foam 11, the prepreg molded body 12, and the nonwoven fabric are bonded together using rubber-based adhesive elements.

  On the other hand, another sheet-like member is bonded to the other surface side of the thermoplastic resin foam 11 via a laminate film as an adhesive element. Here, the other sheet-like member is obtained by molding a glass cloth impregnated with a phenol resin by a heating type pressing device.

  According to the test mode, the diaphragm described above is applied to i) immediately after bonding the elements of the diaphragm, ii) immediately after leaving the diaphragm in a 100 ° C. environment for 24 hours, and iii) to apply such a diaphragm. A subwoofer with a diameter of 30 cm was accommodated in a speaker box with a volume of 24.5 (L), and a confirmation test was conducted to check if the prepreg molded body was lifted immediately after a 2 Kw audio signal was input to the subwoofer and operated for 24 hours. . In addition, a test aspect is set to four test aspects by the combination of the presence or absence of the hole (through-hole) to the thermoplastic resin foam 12, and the presence or absence of a nonwoven fabric.

  At this time, the experimental result 1 related to each test mode of the condition i) is shown in FIG. 4A, the experimental result 2 related to each test mode of the condition ii) is shown in FIG. 4B, and the condition iii The experimental result 3 according to each test mode is shown as a chart in FIG.

  Examining the above experimental results 1 to 3, in the diaphragm, when the thermoplastic resin foam 11 is not provided with a through hole, the prepreg molded body is lifted at a rate of 100% from the thermoplastic resin foam 11. You can see that On the other hand, when nine through-holes 11a having a diameter of φ1.5 mm are provided in the thermoplastic resin foam 11 and a non-woven fabric is further provided, the ratio of occurrence of the prepreg molded body rising from the thermoplastic resin foam 11 is It can be seen that 0%, that is, there is no lifting of the prepreg molded body.

  Therefore, from this experimental result, the preferred configuration of the diaphragm capable of preventing the prepreg molded body 12 from being lifted from the thermoplastic resin foam 11, that is, the peeled state, is the thermoplastic resin foam. 11 and a prepreg molded body bonded to each other through a non-woven fabric, and the thermoplastic resin foam 11 is preferably provided with a plurality of through holes 11a. However, since the above conditions ii) and iii) are tests under extremely harsh environments, even if a nonwoven fabric is not provided on the diaphragm, as shown in the experimental result 1 according to the condition i), The effects of the present invention can be obtained.

  In the above condition ii), when nine through holes 11a having a diameter of φ1.5 mm are provided in the thermoplastic resin foam 11 and a non-woven fabric is further provided, in an environment of 140 ° C. higher than 100 ° C. In addition, it is added that the prepreg molded body 12 did not lift from the thermoplastic resin foam 11 at a rate of 100% even when the diaphragm was left for 24 hours.

[Example of application to speaker devices]
Next, an example in which the speaker device vibration body according to the present invention is applied to an internal magnet type speaker device will be described with reference to FIG. FIG. 5 is a cross-sectional view of a speaker device having a diaphragm as an example of a speaker device vibration body according to an embodiment of the present invention cut at a position passing through the central axis L1.

  The speaker device 100 mainly has a yoke 1 having a crucible shape, a magnet 2 having a disc shape, and a disc shape, and a magnet 2 on the magnet 2. An inner magnet type magnetic circuit 30 having a plate 3 attached thereto, a frame 4 for housing the magnetic circuit 30, a voice coil bobbin 5 having a cylindrical shape, and one plus / minus lead wire ( A voice coil 7 wound around the lower end of the outer peripheral wall of the voice coil bobbin 5, and an edge 8 attached to the upper end of the outer peripheral wall of the voice coil bobbin 5 and the upper end 4a of the frame 4, respectively. And a vibration system 31 having a dome-shaped diaphragm 10 attached to a position where the upper end of the voice coil bobbin 5 is closed. Since the present invention is characterized by the layer configuration of the diaphragm 10 as an example of the speaker device vibration body, the shape of the diaphragm 10, the configuration of the speaker device, the driving method, and the like are not particularly limited.

  In the speaker device 100 having the above configuration, the magnetic flux of the magnet 2 is concentrated in the magnetic gap 9 between the outer peripheral wall of the plate 3 and the upper end portion of the inner peripheral wall of the yoke 1. When a voice current is input to the voice coil 7 from the amplifier side (not shown) through the lead wire of the voice coil 7, a driving force is generated in the voice coil 7 located in the magnetic gap 9. Thereby, the diaphragm 10 vibrates in the direction of the central axis L1 of the speaker device 100 through the voice coil bobbin 5, and radiates sound waves in the direction of the arrow Y1.

  Since the speaker device 100 having the above configuration includes the diaphragm 10 as an example of a speaker device vibration body, the above-described effects can be obtained.

Sectional drawing and top view which show the layer structure of the diaphragm which concerns on the Example of this invention. Sectional drawing which shows a part of manufacturing process of the diaphragm which concerns on a present Example. Sectional drawing which shows the layer structure of the diaphragm which concerns on various modifications. The chart which shows each experimental result under the predetermined conditions of the diaphragm which concerns on a present Example. Sectional drawing of the speaker apparatus which has a diaphragm of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Diaphragm 11 Thermoplastic resin foam 11a Through-hole 12 Prepreg molding 13 Woven cloth (or non-woven fabric)
14 Other sheet-like members 70 Adhesive elements 100 Speaker device

Claims (8)

A thermoplastic resin foam, and a sheet-like member bonded to at least one surface of the thermoplastic resin foam,
The vibration body for a speaker device, wherein the thermoplastic resin foam is provided with at least one through hole. A woven fabric or a non-woven fabric is provided between the thermoplastic resin foam and the sheet-like member,
The vibrating body for a speaker device according to claim 1, wherein the woven fabric or the non-woven fabric is bonded to the thermoplastic resin and the sheet-like member.   The speaker device vibration body according to claim 1, wherein the thermoplastic resin foam is a foamed acrylic resin mainly composed of methyl methacrylate and methacrylic acid.   2. The speaker device according to claim 1, wherein the sheet-like member is a prepreg molded body formed by heating and pressurizing a prepreg formed by impregnating a sheet-like cloth material with resin into a predetermined shape. Vibrating body. The fibers constituting the cloth material are carbon fibers,
The speaker device vibration body according to claim 4, wherein the resin is any one of a vinyl ester resin, an epoxy resin, and an acrylic resin.   The vibration member for a speaker device according to claim 1, wherein the sheet-like member is a sheet-like resin film. The sheet-like member is bonded to at least one surface of the thermoplastic resin foam through an adhesive element,
The vibration element for a speaker device according to claim 1, wherein the adhesive element is a rubber adhesive containing a phenol resin or a nylon laminate film.   A speaker device comprising the speaker device vibration body according to claim 1.

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