WO2011122673A1 - Method for manufacturing acoustic diaphragm - Google Patents

Method for manufacturing acoustic diaphragm

Info

Publication number
WO2011122673A1
WO2011122673A1 PCT/JP2011/058102 JP2011058102W WO2011122673A1 WO 2011122673 A1 WO2011122673 A1 WO 2011122673A1 JP 2011058102 W JP2011058102 W JP 2011058102W WO 2011122673 A1 WO2011122673 A1 WO 2011122673A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
portion
edge
gasket
diaphragm
mold
Prior art date
Application number
PCT/JP2011/058102
Other languages
French (fr)
Japanese (ja)
Inventor
高橋 良一
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension

Abstract

Disclosed is a method for manufacturing an acoustic diaphragm provided with: a diaphragm section which vibrates upon receiving an electrical signal or a sound wave; and an edge section which is arranged at the outer periphery of the diaphragm section and supports the diaphragm section, wherein an inside joining tube section which is peripherally arranged along the outer edge of the vibrating section of the diaphragm section is provided in a projecting manner at the outer periphery of the diaphragm section, an outside joining tube section which is peripherally arranged at the outer periphery of the inside joining tube section is provided in a projecting manner at the inner periphery of the edge section, and the inner peripheral face of the outside joining tube section and the outer peripheral face of the inside joining tube section are joined.

Description

Method of manufacturing an acoustic diaphragm

The present invention relates to a process for producing the acoustic diaphragm mounted on the speaker and microphone.
This application, March 2010 2010-079367 Japanese Patent Application No., filed Japan 30 days, 2010-079368 Japanese Patent Application No. filed on Japan on March 30, 2010, and April 2010 15 priority is claimed on Japanese Patent application No. 2010-094013, filed in Japanese on the day, the contents of which are incorporated herein.

Conventionally, as the diaphragm for a speaker, for example as described in Patent Document 1, a circular diaphragm portion which vibrates by receiving an electrical signal, disposed around the outer periphery of the diaphragm portion for supporting the diaphragm portion configuration with an annular edge portion, is known. The edge portion mentioned above, and along the circumferentially extending roles portion with being bulged toward the speaker outside side, and a flange inner projecting toward the inner edge of the roll portion inwardly, the roll portion an outer flange projecting outwardly from the outer edge of, are provided. Further, the diaphragm portion described above is formed into a gradually diverging been tapered toward the speaker outside side (side where the waves are emitted). The manufacturing method of the diaphragm of the configuration described above, is formed by joining the outer peripheral portion of the diaphragm portion by overlapping the inner flange of the edge portion.
Further, one end face of the gasket (gasket) is bonded to the outer flange on.
As a method for producing such acoustic member, two-color molding of the secondary molded article of the primary molded article Toshikatsu edge gasket, or it is conceivable to insert molding the edge gaskets as insert article. Also, when forming an edge at each of the manufacturing method, of the cavity edge is formed, the portion where the outer flange portion is molded, the molten resin that is a portion of one end face of the gasket is exposed is emitted.

Then, as a method of injection molding an edge, the direction in which the two mold is orthogonal to the direction to separate approach, i.e. the radial direction of the acoustic member, the side gate that opens by injecting molten resin molding a method of a method in which two molding die is molded by injecting a molten resin by pin gate which opens to the direction to move away from and approach (e.g., see Patent Document 2) are known.

JP 2007-325221 JP JP-6-270196 discloses

However, in the conventional method of manufacturing an acoustic diaphragm as described above, stress is concentrated at the bonding interface between the diaphragm portion and the edge portion at the time of displacement of the diaphragm portion, moreover, the maximum stress tends to be large because the stress is concentrated one point . Therefore, the bonding interface between the diaphragm portion and the edge portion is easily peeled off, there is room for improvement in durability.

The present invention has the above-mentioned conventional problems is considered to provide a method of manufacturing an acoustic diaphragm which prevents peeling of the bonding interface between the diaphragm portion and the edge portion can be improved durability It is aimed at.
Furthermore, in the conventional manufacturing method of the acoustic member, the injected molten resin in molding the edge, one end face of the portion of the gasket melts, the molten matter from between the outer flange portion of the edge outflow, there is a possibility that the hard coating is formed on the surface of the edge.
In this case, the stress on the portion where the hard coating is formed at the edge formed by the soft material is likely to concentrate, the durability of the edge may be reduced.

Acoustic The present invention has been made in view of such circumstances, that when forming the edges, even if the gasket is melted, it is possible to prevent the molten matter to flow out from between the edges and to provide a manufacturing method of use member.

Meanwhile, the injected molten resin is generally sooner cooling farther from the gate, cooling closer to the gate is slow. Therefore, in the vicinity of the gate, until the end molten resin will be fluidized, residual strain was easy to occur after molding. Accordingly, among the edges after molding, is joined to the gasket, and likely remains residual strain in the junction gate had been devoted.
However this residual strain, just beyond the junction, there is a possibility of spreading to other parts of the rest of the edge. Therefore, there is a possibility that is affected edge overall product characteristics (e.g., vibration characteristics, etc.).

Accordingly, occur in case of using the side gate, by the edge of the opening position of the side gates injecting molten resin in a state of being spaced from the cavity to be molded, the residual strain at the junction of the edge after the molding method for hard are considered.
In other words, by separating the opening position of the side gate from the cavity edges are formed, until the end molten resin portions to fluidize a method to stay in flow passage connecting between the cavity and the side gate. According to this method, it is possible to confine the residual strain in the molded connecting portion in the flow passage, it can be difficult to rest the residual strain at the junction of the edges which are molded in a cavity.

However, this method, after molding, the edges formed in the cavity, the step of cutting the molded connecting portion in the flow path is required. Therefore, it takes time and effort, it is difficult to perform efficient production. Also, failure to disconnect the connection part is the waste residue resulting in newly generated.

The present invention has such circumstances has been made in consideration of, its purpose is not necessary to perform the cutting operation after the molding of the edges, the manufacture of the acoustic member with good product properties are maintained edge it is to provide a method.

Method of manufacturing an acoustic diaphragm according to the present invention, the diaphragm portion which vibrates by receiving an electrical signal or acoustic waves (vibration plate) is circumferentially provided on the outer periphery of the diaphragm edge portion for supporting the diaphragm portion (edge ) and, in the manufacturing method of the acoustic diaphragm (the acoustic member) provided with, on an outer peripheral portion of the diaphragm portion, the inner joint tubular portion which is circumferentially along the outer edge of the vibrating section of the diaphragm portion (the outer cylinder parts, joining tubular portion) is projected, the inner peripheral portion of the edge portion, the outer periphery to circumferentially provided by the outer joint tube portion (the inner cylinder of the inner joint tube portion, the tubular portion) is projected It is characterized by joining the outer peripheral surface of the inner peripheral surface of the outer joint tube portion and the inner joint tube portion.

With such a feature, concentrated portion of the stress during the displacement of the diaphragm portion is comprised at a position distant from the bonding interface between the inner and outer circumferential surfaces of the inner joint tube portion of the outer joint tube portion, acting on the bonding interface stress is reduced. Moreover, since the stress concentration portion is distributed in a relatively broad range, the maximum stress is reduced in the stress concentration portion. Further, since the inner peripheral surface of the outer joint tube portion and the outer peripheral surface of the inner joint tube portion are joined, a large bonding area is secured.

A method of manufacturing an acoustic diaphragm according to the present invention includes: a primary molding step of molding the diaphragm portion, the secondary forming step of forming an edge portion, formed by two-color molding provided with said dichroic joining the outer peripheral surface of the inner joint tube portion and the inner peripheral surface of the outer joint tube portion by molding is preferred.
Accordingly, and the inner outer joint tube portion and outer peripheral surfaces of the inner joint tube portion are securely joined by a reduced number of steps.

A method of manufacturing an acoustic diaphragm according to the present invention, the inner joint tube portion is preferably protrudes toward the core mold side in the two-color molding.
Thus, the inner peripheral surface of the inner joint tube portion of the diaphragm portion is formed by the core mold, the inner peripheral surface of the inner joint tube portion is in a state of being bonded to the core mold. Therefore, the opening of the mold the primary molding in the two-color molding, likely to be released from the cavity mold the diaphragm portion is firmly retained in the core mold.

A method of manufacturing an acoustic diaphragm according to the present invention, the outer joint tube portion is preferably protrudes towards the cavity mold side in the two-color molding.
Thus, when the primary molding in the two-color molding, it is not necessary to protrude the thin core to be inserted into the molding space of the outer joint tube portion to the cavity mold, the molding accuracy possible easily core damaged secured sex is also reduced.
The manufacturing method of the acoustic member of the present invention, an annular gasket mounted in an acoustic apparatus frame (frame) (gasket) is joined to the gasket, and a soft material than the material forming the gasket the formed annular edge (the edge portion), a manufacturing method of the acoustic member provided with a two-color molding and the secondary molded product of the primary molded article Toshikatsu the edge of the gasket or the gasket insert to insert molding the edge as goods, it is formed by, at the time of injection molding of the edge, by flowing along a plurality of surfaces contiguous to each other among the molten resin surface of the gasket, and molding the edges and these joined in succession to a plurality of surfaces, part of the bonding portion between the gasket at the edge is, injection molding of the edge Molten resin is a gate portion is injected into.

According to the invention, during the injection molding of the edge, since the flow along a plurality of surfaces contiguous to each other in the surface of the molten resin of the gasket, the injected molten resin, the plurality of surfaces in the gasket, the even if some of the first surface near the gate portion is melted and the other surface located away from the gate portion than the first surface, and the connecting portion between these surfaces to each other, the molten matter it is possible to suppress the flow. Therefore, it is possible to prevent the above-mentioned melting component flows out from between the joint portion and the plurality of surfaces of the gasket edge.

Here, the plurality of surfaces in the gasket may be continuous through the corner from each other.

In this case, since the plurality of surfaces in the gasket are continuous through the corner from each other, it is possible to make it difficult to shift the melting amount of the foregoing from the first surface to the other surface of the molten matter it is possible to reliably inhibit the flow.

Further, at least one of the plurality of surfaces in the gasket may be located inward in the radial direction from the gate portion.

In this case, at least one of the plurality of surfaces in the gasket, since is located inside in the radial direction from the gate portion, effects of the above is successful reliably.

Further, the bonding portion between the gasket at the edge is provided with a joint tube portion outer circumferential surface is joined over the entire circumference on the inner peripheral surface of the gasket, to the edge, domed in the axial direction of the acoustic member the extends over the curved and the entire circumference, roll unit is provided which is located inward in the radial direction from the joining tubular portion, the roll portion and said joint tube portion may be connected via a step portion.

In this case, since the roll portion located inward in the radial direction from the joining tubular portion and the joint tube portion are connected via a step portion, for example, when using the acoustic member by vibrating the edge or the like , it is possible to reduce the stress applied to the interface between the outer peripheral surface and the inner peripheral surface of the gasket of the joint tube portion.
The manufacturing method of the acoustic member according to the present invention, an annular gasket mounted in an acoustic apparatus frame, an annular edge formed by the softer material than the material and form a gasket is joined to the gasket, a manufacturing method of the acoustic member comprising, formed by the gasket as a primary molded product, and insert molding the edge two-color molding of the edge and the secondary molded article, or the gasket as insert article is, at the time of injection molding of said edge, said opening in the axial direction of the acoustic member, and then injecting a molten resin into the gasket and the mold cavity of the pin gates facing the joint surface between the edge, the gasket the thickness in the axial direction of the joint portion joined to the molded thicker than the thickness of the other portion which is disposed radially inward than the gasket Continuously inward in the radial direction of the gasket, and the surface of the edge located on the front side of the opening direction of the pin gate is the joint surface on the same plane, or in front of the opening direction of the pin gate than the junction surface It is located on the side.

According to the present invention, when forming the edge by injecting molten resin into mold cavity of the pin gate and thicker than the thickness of other portions of the thickness of the joint portion joined to the gasket since securing bulky, easily trapped residual strain caused around the pin gates to the joint portion.
Moreover, continuous inward in the radial direction of the gasket, and the surface of the edge located on the front side of the opening direction of the pin gate is on joint surfaces flush with the gasket, or in front of the opening direction of the pin gate than the junction surface located on the side, i.e., it is positioned at a position away from the pin gates than the junction surface. Therefore, the end to a molten resin during molding it is possible to remain a part of fluidized in the vicinity of the pin gates.

Thus, it helps to keep the junction portion of the residual strain, as described above, can be suppressed widens the influence of residual strain on other parts of the other edge. Therefore, the product characteristics of the entire edge can be made excellent characteristics as designed, can lead to the generation of optimal acoustic.
Further, after the injection molding of the edges, it is not necessary to perform the conventional go though cutting work or the like newly, it enables efficient production. Furthermore, it is possible to prevent the outer diameter of the molded article by increasing the volume of the joint portion in the axial direction which is the opening direction of the pin gate is large, the outer diameter of the acoustic member is difficult to size.

Further, the manufacturing method of the acoustic member of the present invention, the gasket extending along the axial direction, may and extending portion disposed is provided on the outside in the radial direction of the joint .

In this case, since the extended portion of the hard material of the gasket than the edge is disposed radially outward of the junction of the edge, excessive deformation of the edge can be suppressed by the extended portion it is. Therefore, for example, when to mount the acoustic member via a gasket acoustic device frame, utilizing the extended portion that the external force in the axial direction is also deformed so that the edge softwood matter collapses as transmitted to the edge it is possible to suppress Te. Thus, facilitate the positioning of the acoustic member along the axial direction more accurately, it is possible to improve the assemblability.

In the method of the acoustic member of the present invention, the junction surface between the joint portions in the gasket, said along the axial direction in the cavity even if the projecting portion toward the joint portion is projected good.

In this case, during injection molding of the edge, even if a part of the gasket is melted by injected molten resin from the pin gate, the convex portion functions as a blocking wall, portions other than the joint in the molten component edge it is possible to suppress that would flow to the side. If, when the melting portion of the gasket had dissolved into the other portion side, a hard coating is formed on the surface of the other portions, the stress at the interface portion is concentrated other portions of the coating it may reduce the durability. However, it is possible to suppress the melting amount of leaching of the gasket by the convex portions, hardly such problems occur.

In the method of the acoustic member of the present invention, the junction surface between the joint portions in the gasket, the protruding portion protruding inward in the radial direction from the gasket within the cavity may be formed .

In this case, during injection molding of the edge, even if gaskets had occurred small gap between the mold and thermal contraction, it is possible to close the inlet of the gap at the projecting portion. This allows the molten resin injected from the pin gate is prevented from flowing into the gap easily prevents burr at the joint interface between the gasket and the edge occurs.

According to the manufacturing method of the acoustic diaphragm according to the present invention, the maximum stress is small at the stress concentration portion with the stress concentration portion at the time of displacement of the diaphragm portion is at a position distant from the bonding interface between the diaphragm portion and the edge portion it further, the bonding area between the diaphragm portion and the edge portion is largely secured, it is possible to prevent peeling of the bonding interface between the diaphragm portion and the edge portion, it is possible to improve the durability of the acoustic diaphragm it can.
According to the manufacturing method of the acoustic member according to the present invention, when forming the edges, even if the gasket is melted, it is possible to prevent the molten matter to flow out from between the edges.
According to the manufacturing method of the acoustic member according to the present invention, it is unnecessary to perform the cutting operation after the molding of the edges without producing acoustic member with good product properties are maintained edge.

Figure 1 is a cross-sectional view of an acoustic diaphragm for illustrating an embodiment of the present invention. Figure 2 is a partial cross-sectional view of an acoustic diaphragm for illustrating an embodiment of the present invention. Figure 3A is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. 3B is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. Figure 3C is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. Figure 4A is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. Figure 4B is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. Figure 4C is a sectional view showing a manufacturing process of the acoustic diaphragm for illustrating an embodiment of the present invention. Figure 5 is a partial cross-sectional view of an acoustic diaphragm for explaining a modification of the present invention. Figure 6 is a longitudinal sectional view of the acoustic member shown as an embodiment according to the present invention. 7A is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. 7B is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. 7C is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. Figure 8A is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. Figure 8B is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. 8C is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. Figure 9 is a longitudinal sectional view showing an embodiment of an acoustic member according to the present invention. Figure 10A is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. 9 is a diagram showing the flow of molding the diaphragm and the gasket by injection molding. Figure 10B is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. 9 is a diagram showing the flow of molding the diaphragm and the gasket by injection molding. Figure 10C is a first process diagram showing the manufacturing method of the acoustic member shown in FIG. 9 is a diagram showing the flow of molding the diaphragm and the gasket by injection molding. Figure 11A is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. 9, after the state shown in FIG. 10A ~ 10C, a diagram showing the flow of molding by injection molding an edge. Figure 11B is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. 9, after the state shown in FIG. 10A ~ 10C, a diagram showing the flow of molding by injection molding an edge. Figure 11C is a second process diagram showing the manufacturing method of the acoustic member shown in FIG. 9, after the state shown in FIG. 10A ~ 10C, a diagram showing the flow of molding by injection molding an edge. Figure 12 is an enlarged view of a portion surrounded by a dotted line in FIG. 11B. Figure 13 is a partial sectional view showing a modification of the acoustic member according to the present invention. Figure 14 is a partial sectional view showing a modification of the acoustic member according to the present invention.

Hereinafter, the first embodiment of the manufacturing method of the acoustic diaphragm according to the present invention will be described with reference to the drawings.
Acoustic diaphragm (acoustic member) 1 shown in FIG. 1 is a diaphragm for a speaker which converts electric signals into sound waves, is a member that emits sound waves towards the outside of the speaker receives an electrical signal .
Incidentally, the upper surface side of the acoustic diaphragm 1 in FIG. 1, that is an external side of the speaker, the lower side of the back surface side of the acoustic diaphragm 1 in FIG. 1, an internal side of the words speaker. Hereinafter, the speaker outer side and "upper", describing a speaker internal side as "lower". Further, one-dot chain line O as shown in FIG. 1 shows a diaphragm portion (diaphragm) 2 and the edge portions (edge) 3 the central axis which will be described later, hereinafter referred to simply as "the axis O". Further, the direction along the axis O and the "axial direction", the direction perpendicular to the axis O and the "radial direction", the direction of the axis O is referred to as "circumferential direction".

First, the configuration of the acoustic diaphragm 1.
As shown in FIGS. 1 and 2, the acoustic diaphragm 1 is a member mounted fitted inside the frame 10, the schematic configuration of the acoustic diaphragm 1 receives the electrical signal a diaphragm unit 2 that vibrates, and the edge portion 3 for supporting the diaphragm portion 2 is circumferentially provided on the outer periphery of the diaphragm portion 2, and their disposed a gasket on top of the outer peripheral portion of the edge portion 3 (the gasket) 4 , and a. The acoustic diaphragm 1 is integrally formed by two-color molding to the edge portion 3 and the secondary molded article with the diaphragm portion 2 and the gasket portion 4 on a primary molded product.

The diaphragm unit 2 is a generally circular plan view of the partition wall portion made of synthetic resin on the outer peripheral portion of the diaphragm portion 2, the inner joint tube portion extending in the axial direction (the outer tube portion, the joint tube portion) 20 It is projected. In detail, the diaphragm portion 2, a dome shape toward the upper side a plate-like vibrating portion 21 which bulges (spherical) core mold 51 (Fig. In two-color molding described above from an outer edge of the vibrating section 21 3A ~ Figure 3C, shown in FIGS. 4A ~ Figure 4C.) side, i.e. the inner joint tube portion 20 projecting toward the upper side, is provided.
The inner joint tube portion 20, a cylindrical portion of substantially cylindrical shape which is circumferentially over the entire circumference along the outer edge of the vibrating section 21, the height H of the inner joint tube portion 20, the thickness of the vibrating section 21 It has been for 20 times from twice the d and (2d ~ 20d). On the upper surface of the vibrating portion 21, a plurality of (not shown) protruding ribs extending radially from the center portion of the vibration portion 21 is formed in plan view.

Edge portion 3 is a peripheral surface ring portion of the circumferentially provided has been viewed substantially annular throughout the entire periphery along the (inner joint tube portion 20) of the diaphragm portion 2, the inner peripheral portion of the edge portion 3 the outer joint tubular portion extending in the axial direction (the inner cylinder, the cylindrical portion) 30 is projected. In detail, the edge portion 3 is made of synthetic resin easily soft to deform than the diaphragm portion 2 as described above, in the edge portion 3, a roll 31 of curved shape in longitudinal cross section, inner joint tube described above an outer joint tube portion 30 provided around the outer periphery of the section 20, a support portion 32 for supporting the gasket 4, is provided.

Roll unit 31 is a vertical cross section a substantially inverted U-shaped bulging portion that bulges in the axial direction upper side, extends over the entire circumference and are formed in plan view substantially annular . The inner peripheral portion of the roll portion 31 is raised from the outer peripheral surface of the upper end portion of the outer joint tube portion 30, the joint interface of the inner edge of the roll portion 31, the inner joint tube portion 20 and the outer joint tube portion 30 It positioned radially outward than S. The outer peripheral portion of the roll portion 31 is raised from the inner peripheral surface of the upper end portion of the cylindrical portion (outer cylinder) 33 of the support portion 32 to be described later.

Outer bonding cylindrical portion 30 is a cylindrical portion of substantially cylindrical shape and is circumferentially over the entire circumference along the outer peripheral surface of the inner joint tube portion 20 described above. The outer joint tube portion 30, the cavity metal mold 61 and 62 in the two-color molding described above from the inner edge of the roll portion 31 (FIGS. 3A ~ FIG 3C, shown in FIGS. 4A ~ Figure 4C.) Side, i.e. toward the lower side It is projecting Te. The upper and lower end surfaces of the outer joint tube portion 30 is formed in each flush with the upper and lower end surface of the inner joint tube portion 20. That is, the height H of the outer joint tube portion 30 has a 20 times 2 times the thickness d of the vibration section 21 (2d ~ 20d). Further, the inner peripheral surface of the outer joint tube portion 30 is joined (e.g., heat fusion) to the outer peripheral surface of the inner joint tube portion 20 by two-color molding described above, thereby, the diaphragm portion 2 and the edge portion 3 bets are integrated. The coil 11 (not shown) is disposed below these inner joint tube portion 20 and the outer joint tube portion 30.

Supporting portion 32 is an inner peripheral surface and the lower surface plate portion which is bent in the longitudinal sectional view substantially L-shape along the gasket portion 4, extend along the entire circumference along the outer edge of the roll portion 31 It is formed in a planar view annular Te. The support portion 32 includes a cylindrical portion 33 of the cylindrical shape projecting toward the lower from the outer edge of the roll portion 31, a flange portion 34 protruding from the lower end of the cylindrical portion 33 radially outward, are provided . Tubular portion 33 is formed along the inner peripheral surface of the lower portion of the gasket 4, the flange portion 34 is formed along the lower end face of the gasket 4.

Gasket 4 is a ring of cylindrical shape fitted to the inside of the frame 10. The gasket 4 is made of the same synthetic resin as the diaphragm portion 2 is formed by molding simultaneously with the diaphragm portion 2. Moreover, by two-color molding described above, together with the inner circumferential surface of the lower portion of the gasket 4 is bonded (e.g. heat-sealed) to the outer peripheral surface of the cylindrical portion 33 of the support portion 32 described above, the lower end surface of the gasket 4 There are bonded (e.g., thermal fusion) to the upper surface of the flange portion 34 of the support portion 32 described above, by which a gasket portion 4 and the edge portion 3 are integrated.

Next, a method for manufacturing the acoustic diaphragm 1 having the above-mentioned structure.

First, as shown in FIG. 3A ~ Figure 3C, performs primary molding step of molding the diaphragm portion 2 and the gasket portion 4 is primary molded product and the core mold 51 by the primary cavity mold 61.

In more detail, first, as shown in FIG. 3A, after being opposed to the fixed core mold 51 fixed to the movable side mold plate 50 to the fixed die plate 60 primary cavity mold 61, the movable-side mold toward the plate 50 to the stationary side mold plate 60 side is advanced (lowered), a mold closing step of adhering each mating faces of the primary cavity mold 61 and the core metal mold 51. Thus, between the core mold 51 and the primary cavity mold 61, the molding space for molding the diaphragm portion 2 and the gasket portion 4, respectively, are formed.

Subsequently, as shown in FIG. 3B, the resin material in the molding space above by injecting a resin material having fluidity from gate 64 which penetrates over the molding surface of the fixed die plate 60 from the primary cavity mold 61 filled an injection step of performing. Accordingly, the diaphragm portion 2 and the gasket portion 4 is primary molded product is molded, respectively.
However, since a shape outer joint tube portion 30 of the edge portion 3 (shown in FIG. 4B ~ Figure 4C.) Protrudes toward the primary cavity mold 61 side, a thin core in the primary cavity mold 61 it is not necessary to protrude the wall thickness of the core 61a is projected from the primary cavity mold 61.
Thus, the mold closing process and during the injection step core 61a when it is or or hardly damaged deformed.

Subsequently, as shown in FIG. 3C, after curing the resin of the diaphragm portion 2 and the gasket portion 4, is retracted in a direction away the movable side mold plate 50 from the fixed die plate 60 (increase) the primary cavity performing mold opening step of separating the mold 61 and the core metal mold 51. At this time, the diaphragm portion 2 and the gasket portion 4 is primary molded product is held in the core mold 51 moves together with the core mold 51. Accordingly, the diaphragm portion 2 and the primary cavity mold 61 from the gasket 4 is demolded. At this time, the inner joint tube portion 20 of the diaphragm portion 2 protrudes toward the core metal mold 51 side, since the inner peripheral surface of the inner joint tube portion 20 is joined to the core mold 51, the diaphragm portion 2 There tends to be released from the primary cavity mold 61 is tightly held by the core metal mold 51.

Next, as shown in FIG. 4A ~ Figure 4C, it performs secondary molding step by the core metal mold 51 and the secondary cavity mold 62 for molding the edge portion 3 is a secondary molded article.

In more detail, first, as shown in FIG. 4A, it is opposed to the fixed core mold 51 fixed to the movable side mold plate 50 to the fixed die plate 60 secondary cavity mold 62. Then advanced (downward) toward the movable-side mold plate 50 on the stationary side mold plate 60 side, performing mold closing step of adhering each mating faces of the secondary cavity mold 62 and the core metal mold 51. Thus, between the core metal mold 51 secondary cavity mold 62, together with the molding space for molding the edge portion 3 is formed, the diaphragm portion held by the core metal mold 51 mentioned above 2 and the gasket portion 4 It is sandwiched.

Subsequently, as shown in FIG. 4B, the resin material in the resin material by injection molding cavity as described above having fluidity from gate 63 which penetrates over the molding surface of the fixed die plate 60 secondary cavity mold 62 performing an injection filling. Thus, the edge portion 3 is formed is a secondary molded article. In this case, for example, by the heat of the resin material, the outer peripheral surface of the inner joint tube portion 20 of the diaphragm portion 2, and the inner peripheral surface and the lower end surface of the lower portion of the gasket 4 is melted, respectively. Thus, the inner peripheral surface of the outer joint tube portion 30 of the edge portion 3 is welded to the outer peripheral surface of the inner joint tube portion 20 of the diaphragm portion 2. At the same time, the upper surface of the outer peripheral surface and the flange portion 34 of the edge portion 3 of the tubular portion 33 are respectively fused to the inner peripheral surface and the lower end surface of the lower portion of the gasket 4. Thus, the edge portion 3 is acoustic diaphragm 1 is formed integrally with the diaphragm portion 2 and the gasket portion 4.

Subsequently, as shown in FIG. 4C, after the resin of the edge portion 3 as described above is cured, is retracted in a direction away the movable side mold plate 50 from the fixed die plate 60 (up), the secondary cavity mold 62 performing mold opening step of separating the core mold 51 and. In this case, the acoustic diaphragm 1 is held in the core mold 51 moves together with the core mold 51. Thus, the secondary cavity mold 62 from the acoustic diaphragm 1 is demolded. Further, after the acoustic diaphragm 1 is released from the secondary cavity mold 62, protruding acoustic diaphragm 1 by the ejector pins (not shown) provided in the movable mold plate 50. Thus, the acoustic diaphragm 1 is released from the core mold 51.
Thus, the manufacturing process of the acoustic diaphragm 1 is completed.

According to the manufacturing method of the acoustic diaphragm 1 as described above, stress concentration at the time of the displacement diaphragm portion 2, the inner edge (A portion shown in FIG. 2) of the roll portion 31 of the edge portion 3, and the outer joint tube portion made at a position distant from the bonding interface S between the inner and outer circumferential surfaces of the inner joint tube portion 20 of 30. Accordingly, the stress acting on the bonding interface S is reduced to about 90% about as compared with the prior art. Moreover, since the stress concentration portion is distributed in a relatively broad range, the maximum stress in the stress concentration portion, about 50% about smaller than that in the prior art. Further, since the outer peripheral surface of the inner peripheral surface of the outer joint tube portion 30 and the inner joint tube portion 20 is joined, a large bonding area is secured. Therefore, it is possible to prevent peeling of the bonding interface S between the diaphragm portion 2 and the edge portion 3, it is possible to improve the durability of the acoustic diaphragm 1.

Further, after forming the diaphragm portion 2 and the gasket portion 4 by primary molding, the edge portion 3 is formed with the acoustic diaphragm 1 by two-color molding to form the secondary molding, the outer peripheral surface of the inner joint tube portion 20 and the inner peripheral surface of the outer joint tube portion 30 are joined by two-color molding with. Therefore, the outer peripheral surface of the inner peripheral surface of the outer joint tube portion 30 and the inner joint tube portion 20 is reliably joined by a reduced number of steps. Therefore, it is possible to improve the durability of the acoustic diaphragm 1, it is possible to improve the productivity of the acoustic diaphragm 1.

Further, since the inner joint tube portion 20 is protruded toward the core metal mold 51 side, during the mold opening process in the primary molding, the primary cavity metal is strongly held to the diaphragm portion 2 is the core mold 51 likely to be released from the mold 61. Therefore, it is possible to prevent a problem that the diaphragm portion 2 is detached from the core mold 51 during the mold opening process of the primary molding.

Further, since the outer joint tube portion 30 is projected toward the primary cavity mold 61 side, the core 61a of the thick primary cavity mold 61 are projected. Therefore, hardly damaged or deformed core 61a is at the mold closing step and during the injection step in the primary molding, it is possible to improve the molding accuracy of the inner joint tube portion 20 and the outer joint tube portion 30, vibration sound it can improve the quality of the plate 1.

The joining of the inner peripheral portion of the roll unit 31, and raised from the outer peripheral surface of the upper end portion of the outer joint tube portion 30, the inner edge of the roll portion 31, the inner joint tube portion 20 and the outer joint tube portion 30 It is located radially outward of the interface S. Therefore, stress concentration at the time of the displacement diaphragm portion 2 is surely away from the bond interface S. Thus, it is possible to reliably prevent peeling of the bonding interface S between the diaphragm portion 2 and the edge portion 3.

Having described embodiments of the manufacturing method of the acoustic diaphragm according to the present invention, the present invention is not intended to be limited to the embodiments described above, and can be suitably changed without departing from the scope thereof .
For example, in the embodiment described above, the outer joint tube portion 30 of the edge portion 3 is projected toward the lower side (cavity mold 61 side), the present invention is, as shown in FIG. 5, the edge portion outer bonding cylindrical portion 130 of the 103 core mold 51 side may be configured to protrude toward the (upper side in FIG. 5).

Further, in the embodiment described above, are formed in a shape supporting portion 32 of the edge portion 3 is bent in the longitudinal cross-sectional view substantially L-shaped, the present invention is, as shown in FIG. 5, the edge portion 103 it may be a flat plate-shaped support 132 which protrudes radially outwardly from the outer edge of the roll portion 131.

Further, in the embodiment described above, the inner periphery of the roll 31 from the outer peripheral surface of the outer joint tube portion 30 of the edge portion 3 is raised directly, the present invention is, as shown in FIG. 5, the edge connecting portion 135 between the inner edge of the outer peripheral surface and the roll section 131 of the outer joint tube portion 130 may be interposed parts 103. Thus, the distance between the bonding interface S between the stress concentration portion and the inner joint tube portion 20 and the outer joint tube portion 130 at the time of the displacement diaphragm portion 2 is lengthened, reducing smaller the stress applied to the joined interface S can be, it is possible to reliably prevent peeling of the bonding interface S.

Further, in the embodiment described above, the diaphragm portion 2 is formed in circular shape in plan view, the vibration portion 21 of the diaphragm portion 2 is formed in a spherical shape which is swollen toward the upper side (external side of the speaker) but the present invention is the shape of the diaphragm portion is can be appropriately changed, for example, the plan view elliptical shape or a rectangular, may be a diaphragm of other shapes, or Ya diaphragm portion having a flat vibrating portion it may be a diaphragm portion having a tapered cylindrical vibrating portion which is gradually diverging toward the upper side (external side of the speaker).

Further, in the embodiment described above, the roll 31 of the edge portion 3 are bulged toward the upper side (external side of the speaker), the present invention is, (internal side of the speaker) roll unit 31 is lower it may be bulging towards. Furthermore, the present invention may be a no edge roll portion 31, the shape of the edge portion can be appropriately changed.

Further, in the embodiment described above, the gasket 4 is described acoustic diaphragm 1, which is formed integrally, the present invention can also be in the acoustic diaphragm gasket 4 is omitted it is. For example, it may be a gasket in separate parts.

Further, in the embodiment described above, the inner joint tube portion 20 of the diaphragm portion 2 is projected toward the core metal mold 51 side, the present invention, the inner joint tube portion of the diaphragm portion 2 cavity mold side it is also possible to protruding configuration.

Further, in the embodiment described above, the diaphragm portion 2 and the gasket portion 4 is formed by primary molding, but by molding the acoustic diaphragm 1 by two-color molding to form the edge portion 3 by the secondary molding, the an acoustic diaphragm in the invention can also be formed in other ways, for example, an edge portion is formed by primary molding, it may form a diaphragm portion at the secondary molding. Furthermore, the present invention, it is also possible to form an acoustic diaphragm by a method other than the two-color molding, for example, it can be formed by insert molding. Alternatively, after the diaphragm portion and the edge portion is molded separately, it may be formed acoustic diaphragm by bonding the inner joint tube portion and the outer joint tubular portion with an adhesive.

Further, in the embodiment described above has described the acoustic diaphragm 1 in the speaker which converts electric signals into sound waves, the present invention is a microphone for converting into an electric signal vibrates by receiving a sound wave it may be a vibration plate.

Other, without departing from the scope of the present invention, by replacing the components in the embodiments described above in well-known components are possible as appropriate, it may also be appropriately combined modifications described above.
Next, a second embodiment of the acoustic member according to the present invention (an acoustic vibration plate) will be described with reference to FIG.
Acoustic member 10 of this embodiment, the vibration plate 110, an annular gasket (gasket) 120 is mounted to surround and and acoustic device frame (frame) F the diaphragm 110 from the outside in the radial direction, these is bonded to the diaphragm 110 and the gasket 120 and the annular edge (edge ​​portion) 130 for connecting the two, with a, to radiate sound waves to the outside of the audio device receives an electrical signal.

Here, the gasket 120 and the edge 130 are arranged on a common shaft coaxially respectively.
Hereinafter, refers to the common axis and the axis O, the upper outside of the acoustic device along the axis O direction, refers to the inside of the acoustic device and the lower, also refers to a direction orthogonal to the axis O in the radial direction, further the direction of circulation about the axis O of the circumferential direction.

Diaphragm (diaphragm) 110 is a dome-shaped vibrating part 110a that bulges upward, the outer tube portion extending upward to the outer peripheral edge of the vibrating portion 110a (inner joint tube portion, the joint tube portion ) comprising a 110b, and are integrally formed by a synthetic resin material such as polypropylene.
Vibrating unit 110a is formed in a circular shape in plan view, it is arranged on the axis O and coaxial. The vibration unit 110a is formed so as to vibrate by receiving an electronic signal.
Together with the outer tube portion 110b is formed in a cylindrical shape, it is disposed in the axis O and coaxial. Of the outer tubular portion 110b height H1 is, e.g., about 20 times to about 2 times the thickness d1 of the vibrating portion 110a.
The gasket 120 is formed in an annular shape with the same material as the material forming the diaphragm 110.

Edge 130 is curved in a dome shape in the axis O direction and the roll portion 140 extending over the entire circumference, inner cylinder disposed radially inward to the axis O coaxially than roll unit 140 (outer bonding cylinder parts, a cylindrical portion) 150, an outer tube disposed in the axial O coaxial outward in the radial direction from the roll unit 140 (joint tube portion, a cylindrical portion) 160, in the radial direction at the lower end of the outer tube 160 comprising lower flange portions which protrude over the entire circumference toward the outer side (flange portion, junction) and 170. Edge 130, for example, styrene-based thermoplastic elastomer, and is formed integrally of a soft material than the material forming the injection moldable and diaphragm 110 and a gasket 120. Incidentally, the edge 130 is formed in an annular shape.

Roll portion 140, in this embodiment, is formed in a dome shape that bulges upward.
Note that in the longitudinal cross section of the acoustic member 10, the radius of curvature of the roll section 140 is smaller than the radius of curvature of the vibrating portion 110a of the diaphragm 110. Then, connected to the upper end of the inner peripheral portion of the bottom inner cylinder 150 of the roll 140, the lower end of the outer peripheral portion of the roll unit 140 is connected to the upper end of the outer cylinder 160. Furthermore, in this embodiment, the upper end of the lower end and the inner cylinder 150 of the inner peripheral portion of the roll 140, is connected via a flange-like first stepped portion 180 extending continuously over the entire circumference, roll 140 the upper end of the lower end and the outer cylinder 160 of the outer peripheral portion are connected via a second stepped portion 190 flange-like extending continuously over the entire periphery.

The inner peripheral surface of the inner cylinder 150 of the edge 130 is joined to the outer peripheral surface of the outer cylindrical portion 110b of the diaphragm 110.
Then, the outer peripheral surface of the outer cylinder 160 of the edge 130, and the inner circumferential surface 120a of the gasket 120, but is joined over the entire circumference, and the upper surface of the lower flange portion 170 of the edge 130, and the lower end surface 120b of the gasket 120, but the total It is joined over circumference. In the illustrated example, the lower portion of the inner circumferential surface 120a of the gasket 120 is joined to the edge 130, the lower end surface diameter direction of the inner portion of 120b of the gasket 120 is joined to the edge 130.

That is, in the present embodiment, the edge 130 is joined continuously along the inner circumferential surface 120a and the lower end surface 120b contiguous to each other in the surface of the gasket 120. The joining portion between the gasket 120 in the edge 130, has an outer tube 160 and the lower flange portion 170. Thus, the edge 130, the roll 140 is positioned inward in the radial direction from the outer cylinder 160 that is joined to the inner peripheral surface 120a of the gasket 120 and connected to the outer tube 160 through the second stage 190 It is. The height H2 of the outer tube 160 is, eg, about 0.5 times the thickness d2 of the lower flange portion 170 and about 10 times.
Further, in this embodiment, the inner peripheral surface 120a and the lower end surface 120b of the gasket 120 is continuous through the corner part 120c. Note for example, the angle formed by the inner peripheral surface 120a and the lower end surface 120b of the gasket 120 is about 90 °.

In this embodiment also, part of the lower flange portion 170 in the edge 130 has a gate portion 130a of the molten resin during injection molding of the edge 130 is emitted. The gate portion 130a is formed, for example, during injection molding of the edge 130, which is after the gate 440 of the secondary cavity mold 42 to be described later. In the illustrated example, the gate portion 130a is located on the outer periphery of the lower flange portion 170, at least the inner circumferential surface 120a of the inner circumferential surface 120a and the lower end surface 120b of the gasket 120 where the edge 130 is joined, It is located inside in the radial direction from the gate portion 130a. That is, the inner circumferential surface 120a of the gasket 120, the front side of the gate portion 130a along the flow direction of flow toward the molten resin gate portion 130a at the time of injection molding of the edge 130 to the diaphragm 110 side (inner cylinder 150 side) It is located in.

Next, a description is given of a manufacturing method of the acoustic member 10 as described above.

First, based on FIGS. 7A ~ 7C, using the core mold 310 which is fixed to the movable side mold plate 300, and is fixed to the fixed die plate 400 primary cavity mold 410, and a primary molded article vibrations It will be described primary molding step of molding the plate 110 and the gasket 120.

First, as shown in FIG. 7A, it performs mold clamping is advanced toward the movable-side mold plate 300 to the fixed die plate 400, between the core die 310 and the primary cavity mold 410, the vibration plate 110 and a gasket 120 to form a primary cavity to be molded.
Next, as shown in FIG 7B, by filling with a molten resin is injected into said primary cavity from a gate 430, 430 opening to the cavity surface of the primary cavity mold 410, the vibration plate is an molded product 110 and gasket 120 are molded. Incidentally, in the acoustic member 10, the inner cylinder 150 of the edge 130 and projects downward from the lower end of the inner peripheral portion of the roll 140. Thus, the primary cavity mold 410, without projecting a thin core toward the core mold 310 side, it is sufficient to protrude only highly rigid core 410a in thickness.
Next, as shown in FIG. 7C, performing mold opening retract the movable side mold plate 300 from the fixed die plate 400. At this time, the diaphragm 110 and the gasket 120 is primary molded product is held in the core mold 310 is removed from the primary cavity mold 410. The outer tubular portion 110b of the diaphragm 110 which is molded, protrude toward the core metal mold 310 side from the outer peripheral edge of the vibrating portion 110a, the core 310a of the core die 310 to the outer cylindrical portion 110b is since the fitted diaphragm 110 during mold opening it is prevented from falling off from the core mold 310.

Next, with reference to FIGS. 8A ~ 8C, the core mold 310, and the fixed-side mold plate 400 secondary cavity mold 420 which is fixed to, using a secondary shaping the edge 130 is a secondary molded article molding process will be described.

First, as shown in Figure 8A, the core mold 310 is opposed to the secondary cavity mold 420, Thereafter, the mold clamping is advanced toward the movable-side mold plate 300 to the fixed die plate 400, the core between the mold 310 and the secondary cavity mold 420, with edge 130 to form a secondary cavity to be molded, placing the diaphragm 110 and the gasket 120.
Next, as shown in FIG 8B, by filling with a molten resin is injected into the secondary cavity from a gate 440 which opens to the cavity surface of the secondary cavity mold 420, a secondary molded article edge with 130 is molded, bonded to the diaphragm 110 and the gasket 120, the acoustic member 10 is formed.
In this exemplary embodiment, the molten resin injected into the secondary cavity from the gate 440, to flow along the lower end surface 120b and the inner peripheral surface 120a continuous with each other in the surface of the gasket 120, the edge 130 is formed It is and is continuously joined to the lower end surface 120b and the inner circumferential surface 120a of the gasket 120.
Note in the illustrated example, the gate 440, the cavity surface of the secondary cavity mold 420, the direction in which the movable side mold plate 300 is orthogonal to the direction of forward and backward movement with respect to the stationary side mold plate 400, i.e. the acoustic member 10 It is open in the radial direction of. Then, molten resin is injected toward the inside from the outside in the radial direction in the secondary cavity.
Next, as shown in FIG. 8C, performing mold opening retract the movable side mold plate 300 from the fixed die plate 400. In this case, the acoustic member 10 is held in the core mold 310 is released from the secondary cavity mold 420, then, the core mold is protruded by an ejector pin (not shown) provided on the movable side mold plate 300 310 It is released from.

As described above, according to the manufacturing method of the acoustic member 10 according to this embodiment, at the time of injection molding of the edge 130, the molten resin along the lower end surface 120b and the inner peripheral surface 120a continuous to each other of the surface of the gasket 120 to flow. Therefore, the injected molten resin, of the inner peripheral surface 120a and a lower end surface 120b of the gasket 120, even if part of the lower end surface 120b near the gate portion 130a is melted, the gate portion 130a than the lower end surface 120b inner peripheral surface 120a positioned away and these surfaces 120a, the corner part 120c between 120b between, it is possible to suppress the flow of the molten matter. Therefore, it is possible to prevent the flowing upward from the space between the inner circumferential surface 120a of the outer tube 160 and the gasket 120 of the molten component is edge 130.

In the present embodiment, the inner peripheral surface 120a and the lower end surface 120b of the gasket 120 is continuous through the corner part 120c. Therefore, it is possible to make it difficult to transition to the inner peripheral surface 120a of the melting amount of the foregoing from the lower end surface 120b of the gate portion 130a side, it is possible to suppress the flow of the molten matter reliably.
Furthermore, at least the inner circumferential surface 120a of the inner circumferential surface 120a and the lower end surface 120b of the gasket 120 where the edge 130 is joined is because is located inside in the radial direction from the gate portion 130a, the effects of the above certainly the be successful.

In this embodiment also, the edge 130, the roll 140 is positioned inward in the radial direction from the outer cylinder 160 that is joined to the inner peripheral surface 120a of the gasket 120, and the second step portion 190 to the outer cylinder 160 They are connected to each other through. Thus, for example, the diaphragm 110 and the edge 130 or the like is vibrated when using the acoustic member 10, it is possible to reduce the stress applied to the interface between the inner circumferential surface 120a of the outer circumferential surface and the gasket 120 of the outer tube 160 it can.

It should be noted that the technical scope of the present invention is not limited to the above embodiments, it is possible to make various changes without departing from the scope of the present invention.

For example, in the above embodiment, it is provided a first step portion 180 and the second step portion 190 to the edge 130. However, these 180, 190 and not provided, the inner cylinder 150 and outer cylinder 160 and the roll 140 may be directly connected.
Further, the roll 140 to the edge 130 need not be provided. Further roll 140 may be swelled downward.
In addition, the gate portions 130a in the edge 130 is located below the flange portion 170. However, the position of the gate portion 130a may be appropriately changed. Furthermore, the opening direction of the gate 440 of the secondary cavity mold 420, instead of the embodiment may be a direction of forward and backward movement of the above.
Further, the inner cylinder 150 of the edge 130 may protrude upwardly from the lower end of the inner peripheral portion of the roll 140.
Furthermore, for example, in place of the inner cylinder 150 of the edge 130 may be employed a flange portion projecting over the entire circumference radially inward inner peripheral portion of the roll 140. Further, for example, in place of the outer cylindrical portion 110b of diaphragm 110, it employs a flange portion projecting from the entire periphery on the outer peripheral edge on the outside in the radial direction of the vibrating portion 110a, even when joining the flange portions good.

The vibration portion 110a of the diaphragm 110, for example, instead of the embodiment, viewed from an elliptical shape or a polygonal shape may be other shapes, or may be a flat plate, more from below it may be gradually diverging been tapered tube toward the upper side.
Furthermore, the outer tubular portion 110b of diaphragm 110 may be extended downward from the outer peripheral edge of the vibrating portion 110a.
Further, among the surfaces of the gasket 120, a plurality of surfaces connected to each other where the edge 130 is joined, the not limited to the embodiments example, wave-shaped or saw blade shape, may be changed. Further, between the adjacent those of the plurality of surfaces, it does not have to be present corners 120c.

In addition the embodiment, the acoustic member 10 is formed by two-color molding, instead of this, even when an acoustic member 10 by edge 130 by insert molding the diaphragm 110 and the gasket 120 as insert article good.
Further, in the embodiment described above, it showed an acoustic member 10 for converting electrical signals into sound waves. However, for example, not limited thereto and may be applied to the acoustic member to convert an electrical signal to vibrate by receiving a sound wave.
In addition the embodiments, a configuration has been shown with a diaphragm 110 as an acoustic member 10, the vibration plate 110 may not possess.
In the above embodiment, to form a gasket 120 and edge 130 in an annular shape. However, only without example viewed from an elliptical shape or a polygonal shape thereto, may be formed in other shapes.

Other, without departing from the scope of the present invention, by replacing the components in the embodiment described above the well-known components are possible as appropriate, also a modification in which the may be combined as appropriate.

The following describes a third embodiment of the acoustic member according to the present invention from FIG. 9 with reference to FIG. 13.

Acoustic member of the present embodiment (the acoustic vibration plate) 201, as shown in FIG. 9, the vibrating plate (diaphragm) and 202, and an acoustic device frame surrounding the diaphragm 202 from the outside in the radial direction (frame) an annular gasket (gasket) 203 is mounted to F, an annular edge (edge ​​portion) 204 for connecting the both are joined to these diaphragm 202 and a gasket 203, in which is constituted, the electrical signal receiving emits sound waves to the outside of the acoustic device.

In the present embodiment, the gasket 203 and the edge 204 are disposed on a common shaft coaxially respectively. Hereinafter, this common axis is called the axis O, an outer acoustic device along the axis O direction upward, the inner sound device called lower. Further, means a direction perpendicular to the axis O in the radial direction, the direction of circulation about the axis O of the circumferential direction.

Diaphragm 202 includes a vibrating portion 202a domed bulged upward, upward joint tube portion extending (inner joint tube portion, the outer cylindrical portion) in the outer peripheral edge of the vibrating portion 202a 202b If the provided, it is integrally formed of a synthetic resin material such as polypropylene or the like.
Vibrating portion 202a is arranged on the axis O coaxially is formed in a circular shape in plan view. Further, the vibration part 202a is formed so as to vibrate by receiving an electrical signal.
Joining tubular portion 202b is arranged on the axis O coaxially is formed in a cylindrical shape. The height of the joining tubular portion 202b H1, for example is about 20 fold to about 2 times the thickness d1 of the vibrating portion 202a. The gasket 203 is formed in an annular shape with the same material as the material forming the diaphragm 202.

Edge 4, a roll unit 210 in the direction of the axis O extends over curved and the entire circumference in a circular arc shape, the cylindrical portion disposed in the axis O coaxially inward in the radial direction from the roll unit 210 (outer bonding cylindrical portion, an inner cylinder) 211, joint portions disposed in the axis O coaxially outward in the radial direction from the roll unit 210 (the flange portion, a lower flange portion) 212 includes, for example thermoplastic styrene elastomer or the like and is integrally formed of a soft resin material than the material forming the and the diaphragm 2 and the gasket 203 can be injection molded.

Roll portion 210 is formed in a circular arc shape that bulges upward. A lower end portion of the inner peripheral portion of the roll 210 is connected to the upper end of the cylindrical portion 211 via a flange-shaped step portion 213 extending continuously over the entire circumference. Further, the outer peripheral portion of the roll unit 210 lower end, of the joint portion 212 continuously inward in the radial direction of the radially inner portion (gasket 203 than the gasket 203 of the upper end face 212a, and a later-described pin gate 246 located on the front side of the opening direction is connected to the surface) of the edge 204.

The inner peripheral surface of the cylindrical portion 211 of the edge 204 is joined to the outer peripheral surface of the joint tube portion 202b of the diaphragm 202.
Then, under these cylindrical portion 211 and the joint tube portion 202b, for example, a coil (not shown) is adapted to be disposed in the axis O and coaxial. The lower end face of the radially outer portion of the upper surface 212a of the joint 212 of the edge 204 and the gasket 203 and 203a (the junction surface of the junction 212) is joined over the entire periphery.

Note that the lower end surface 212b of the joint 212, the recess 215 that is recessed at intervals along the circumferential direction at intervals in the circumferential direction formed with a plurality, gate portion 216 is formed on the bottom surface of the recess 215 ing. The gate portion 216 is traces of pin gates 246 formed during injection molding of the edge 204, a portion where the molten resin is injected from the pin gate 246.
The recess 215, after the injection molding of the edge 204, and functions as a recess for accommodating the core mold 231 and a secondary cavity mold 245 and the cutting remainder 217 that may arise when a is separated to be described later there.

Incidentally, the roll portion 210 of the edge 204 of the present embodiment is connected to the inner portion in the radial direction from the gasket 203 of the upper end face 212a of the lower end portion of the outer peripheral portion as described above joint 212. Therefore, continuous inward in the radial direction of the gasket 203 and the surface of edge 204 located on the front side of the opening direction of the pin gate 246, identical to the lower end surface 203a of the gasket is a cemented surface between the bonding portion 212 and the gasket 203 It is located on the plane. In other words, roll portion 210 of the edge 204, the gate portion 216 along the axis O direction, i.e., is connected to the junction 212 at a position close to the gasket 203 than pin gate 246 to be used in injection molding.
The joining portion 12 of the edge 204 of the present embodiment, even when considering the recess portion of the recess 215, the thickness t1 in the axial O direction, portions other than the joint 212 of the edge 204 (gasket 203 It is thicker than the thickness, for example, the wall thickness of the roll unit 210 t2, the thickness t4 of the thickness t3 and the cylindrical portion 211 of the stepped portion 213 of the portion) disposed on the inner side in the radial direction from.

Incidentally, the thickness t1 of the joint 212, the wall thickness of the roll unit 210 t2, but may be thicker than the thickness t4 of the thickness t3 and the cylindrical portion 211 of the stepped portion 213 is formed more than twice thicker it is preferable.

Next, a method for manufacturing the acoustic member 201 configured as described above.
In the present embodiment, the diaphragm 202 and the gasket 203 and the primary molded article, and will be described with a case of producing a two-color molding to the edge 204 and the secondary molded product as an example.

First, based on FIGS. 10A ~ 10C, the core mold 231 which is fixed to the movable side mold plate 230, and is fixed to the fixed die plate 240 primary cavity mold 241, with is the primary molded product the primary molding step of molding the diaphragm 202 and the gasket 203 will be described.

First, as shown in FIG. 10A, it performs mold clamping is advanced toward the movable-side mold plate 230 to the fixed die plate 240, between the core mold 231 and the primary cavity mold 241, the vibration plate 202 and gasket 203 forms a primary cavity to be molded.
Then, as shown in FIG. 10B, by two gates 242 which opens to the cavity surface of the primary cavity mold 241, is filled by injecting a molten resin into the primary cavity, a primary molded article diaphragm 202 and the gasket 203 is molded.
The main vibration plate 202 is formed by molten resin injected from one gate 242, mainly gasket 203 is molded by the injected molten resin from the other of the gate 242.

Incidentally, in the acoustic member 201, since the cylindrical portion 211 of the edge 204 protrudes downward from the lower end of the inner peripheral portion of the roll unit 210, the primary cavity mold 241, in a thin toward the core mold 231 without projecting a child, it is sufficient to protrude from the only high rigidity core 241a in wall thickness.

Then, as shown in FIG. 10C, performing mold opening retract the movable side mold plate 230 from the fixed die plate 240. At this time, the primary molded article diaphragm 202 and the gasket 203 is is held in the core mold 231 is removed from the primary cavity mold within 241.
The bonding cylindrical portion 202b of the diaphragm 202 which is molded protrude toward the core mold 231 side from the outer peripheral edge of the vibrating portion 202a, the core 231a of the core die 231 is fitted to the joint tube portion 202b It has been engaged. Therefore, the vibration plate 202 at the time of mold opening is prevented from falling off from the core mold 231.

Next, with reference to FIGS. 11A ~ 11C, using the core mold 231, and is fixed to the fixed die plate 240 secondary cavity mold 245, and shaping the edge 204 is a secondary molded article two for the next molding step will be described.

First, as shown in FIG. 11A, after facing the core mold 231 in the secondary cavity mold 245, performs mold clamping is advanced toward the fixed die plate 240 for movable side mold plate 230. Thus, between the core mold 231 secondary cavity mold 245, with secondary cavity edge 204 is molded is formed, the vibration plate 202 and the gasket 203 is disposed.

In the present embodiment, the thickness in the axial O direction of the joint 212 to be joined to the gasket 203 of the edge 204 is thicker than the thickness of the portions other than the joint 212 of the edge 204 as, so that the secondary cavity is formed.
Further, in the secondary cavity mold 245, pin gates 246 which opens in the direction of the axis O of the acoustic member 201 which is also the approach direction of separation between the fixed-side mold plate 240 and the movable side mold plate 230 is provided.
At this time, the pin gate 246, so as to face the lower end surface 203a of the gasket 203 is open to the cavity surface of the secondary cavity mold 245.

Then, as shown in FIG. 11B, by filling with a molten resin is injected from the pin gate 246 in the secondary cavity, the edge 204 is formed a secondary molded product, the diaphragm 202 and the gasket 203 They are joined. Thus, the acoustic member 201 is formed.

Then, as shown in FIG. 11C, performing mold opening retract the movable side mold plate 230 from the fixed die plate 240. In this case, the acoustic member 201 is disengaged from being retained in the core mold 31 secondary cavity mold within 245, then, that it protrudes by ejector pins (not shown) provided on the movable side mold plate 230, It is released from the core mold 231.
As a result, it is possible to obtain an acoustic member 201 shown in FIG. Thus, the manufacturing method of the acoustic member 201 is completed.

Note that when the acoustic member 201 is disengaged from the secondary cavity mold within 245, the molten resin was cured by pin gate within 246 is disconnected from the junction 212. Cutting marks at this time, after a pin gate 246, that is, the gate portion 216. Further, even if the cutting remainder 217 when disconnected is leftover in the side joining portion 212 is reliably housed in the recess 215.

In particular, the according to the manufacturing method, when forming the edges 204 and injecting a molten resin by pin gate 246, as shown in FIG. 12, the wall of the thickness of the other portion of the joint portion 212 which is joined to the gasket 203 It has secured bulky and larger than the thickness. Therefore, it is possible to easily trapped residual strain caused around the pin gate 246 (a portion enclosed by the dotted line A shown in FIG. 12) in the joint portion 212.
Moreover, the roll unit 210 connected to the junction 212 is connected at a position close to the gasket 203 than the pin gate 246 along the axis O direction, located on the same plane as the lower end surface 203a of the connecting portion is a gasket 203 are doing. Thus, rather than a portion where the molten resin is fluidized to last roll portion 210 side at the time of molding, it is possible to make allowed to remain in the vicinity of the pin gate 246.

Thus, helps to keep the residual strain in the junction 212 as described above, to other parts of the edge 204 and roll 210, it is possible to suppress the widens the influence of residual strain. Therefore, the edge 204 overall product characteristics (vibration characteristics) can be improved characteristics as designed, by appropriately vibrate the vibrating plate 202, can lead to the generation of optimal acoustic.

Further, according to the manufacturing method of this embodiment, after the injection molding of edge 204, it is necessary to perform the cutting operation which has been performed conventionally (cutting operation of the connecting portion which has been performed at the time of injection molding using a side gate) or the like newly since there is no, it is possible to perform efficient production.
Further, the direction of the axis O is an opening direction of the pin gate 246, since the outer diameter of the volume increased to moldings junction 212 of the edge 204 is prevented from increase, an outer diameter of the acoustic member 201 is large It turned into hardly easily achieving compact acoustic member 201.

Incidentally, in the above embodiment, as shown in FIG. 13, a portion of the gasket 203, extending downward along the axial direction O, the extending portion disposed radially outward of the junction 212 in the edge 204 it may be used as the 250. In this case, the joint portion 212 to the extended portion 250 may be formed annularly so as to surround the outer side in the radial direction over the entire circumference, they are arranged at intervals in the circumferential direction along the joint 212 it may be formed extending portion 250 so that.
In the illustrated example, the extension portion 250 projecting downward along the entire circumference to the outer portion in the radial direction of the lower end surface 203a of the gasket 203, the inner peripheral surface of the extended portion 250 of the joint 212 a case in which bonded to the outer peripheral surface is an example. Further, the inner peripheral surface of the extending portion 250 is a gradually diverging the tapered surface from the upper side toward the lower side, for example to ensure good release properties in the case of producing a gasket 203 by injection molding there.

In this way, since the extended portion 250 of the gasket 203 of a material harder than the edge 204 surrounds the outer joints 212 in the radial direction of the edge 204, the excessive deformation of the edge 204 of the gasket 203 it is possible to suppress utilizing extended portion 250. Therefore, for example, when to mount the acoustic member 201 to the audio device frame F via a gasket 203, that the external force in the axial O direction may be modified as softwood quality of the edge 204 collapses as transmitted to the edge 204 it can be suppressed by a gasket 203.
Thus, facilitate the positioning of the acoustic member 201 in the axial O direction more accurately, it is possible to improve the assemblability of the acoustic member 201.

In the case of forming the extended portion 250, the extending portion 250 may also be long extending downward to near the opening of the recess 215, which as may shorten the length conversely. In any event, it needs only be disposed on the outside in the radial direction of the joint 212.

Furthermore, in addition to the extended portion 50, as shown in FIG. 14, the lower end surface 203a of the gasket 203, in the cavity defined between the core mold 231 secondary cavity mold 245, the direction of the axis O a step portion (projecting portion) 251 toward the joint portion 212 may be protruded along. In the illustrated example, the step portion 251 is projected downward along the entire circumference to the inner portion in the radial direction of the lower end surface 203a of the gasket 203.

In this way, during the injection molding of the edge 204, as part of the gasket 203 is melted by injected molten resin from the pin gate 246, the step portion 251 functions as a blocking wall, the molten component is edge 204 another portion side other than the joint portion 212, it is possible to suppress that would flow example in the roll section 210 side.
If, when the melting portion of the gasket 203 had dissolved into the roll unit 210 side, the hard coating on the surface of the roll 210 is formed, the roll unit stress is concentrated on the interface between the coating it may reduce the durability of 210. However, it is possible to suppress the melting amount of leaching of the gasket 203 by the step portion 251, hardly such problems occur.

Moreover, the stepped portion 251 shown in FIG. 14 is formed so as to function as a protrusion protruding inward in the radial direction from the gasket 203.
Therefore, during injection molding of the edge 204, even if the gasket 203 is thermally contracted, is small clearance D between the example core mold 231 had occurred, it is possible to close the entrance of the gap D. Thus, the injected molten resin from the pin gate 246 can be prevented that would flow into the gap D, easily prevents burrs occurs in the bonding interface between the gasket 203 and the edge 204.

In FIG 14, although the extended portion 250 simultaneously with the step portion 251 and an example case of forming the gasket 203 may be formed a step portion 251 regardless of the extending portion 250. Further, to form a stepped portion 251 so as to protrude inward in the radial direction from the gasket 203, a function as a protruding portion for closing the gap D has been configured to have the above step portion 251, and the stepped portion 251 it may be formed separately protrusion.
Also, in the case of not forming the extended portion 250 in gasket 203 so as to protrude outward in the radial direction than the gasket 203, the protruding portion over the entire circumference to the outer portion in the radial direction of the lower end surface 203a of the gasket 203 it may be formed.

The technical scope of the present invention is not limited to the above embodiments without departing from the scope and spirit of the present invention, it is possible to add various changes.

For example, in the above embodiment, the acoustic member 201 is formed by two-color molding, instead of this, the diaphragm 202 and a gasket 203 as an insert article, acoustic edge 204 by insert molding the contrary the member 201 may be manufactured.
In the above embodiment, the acoustic member 201 that converts electrical signals into sound waves has been taken as an example, without being limited thereto, be applied to the acoustic member to convert an electrical signal to vibrate, for example, it receives an acoustic wave good.

Further, the gasket 203 in the above embodiment, a bonding surface of the surface of the edge 204 contiguous to the inside in the radial direction of the gasket 203, and located on the front side of the opening direction of the pin gate 246, the junction 212 and the gasket 203 so as to be located in the lower end surface 203a on the same plane, and connects the joint portion 212 and the roll 210. However, the surface of the edge 204, the front side of the opening direction of the pin gate 246 than the lower end surface 203a, i.e., may be configured to be positioned on the upper side away from the pin gates 246.
In this way, during injection molding of the edge 204 may be residual strain caused around the pin gate 246 is effectively suppressed that may spread to the roll portion 210 side.

In the above embodiment, it is provided with the edge 204 step portion 213, without providing the step portion 213 may be connected to the roll 210 and the cylindrical portion 211 directly. Although provided roll portion 210 to the edge 204, the roll unit 210 may not be provided rather than indispensable. Incidentally, in the case where the roll 210 may be bulged downward.

Further, the cylindrical portion 211 of the edge 204 may protrude upwardly from the lower end of the inner peripheral portion of the roll 210.
Further, instead of the cylindrical portion 211 of the edge 204, for example on the inside of the inner peripheral side portion in the radial direction of the roll 210 may be employed a flange portion projecting over the entire circumference. At the same time, instead of the joining tubular portion 202b of the diaphragm 202, for example, outside the outer peripheral edge of the radial direction of the diaphragm 202 employs a flange portion which projects over the entire circumference, and joining the flange portions it may be.

The vibration portion 202a of the diaphragm 202, instead of the above-described embodiment, for example, the plan view oval shape or polygonal shape may be other shapes, or may be a flat plate, more from below towards the upper side may be gradually diverging been tapered tube.
Furthermore, the vibrating cylinder portion 211 of the diaphragm 202 may be extended downward from the outer peripheral edge of the vibrating portion 202a.

According to the manufacturing method of the acoustic diaphragm according to the present invention, the maximum stress is small at the stress concentration portion with the stress concentration portion at the time of displacement of the diaphragm portion is at a position distant from the bonding interface between the diaphragm portion and the edge portion it further, the bonding area between the diaphragm portion and the edge portion is largely secured, it is possible to prevent peeling of the bonding interface between the diaphragm portion and the edge portion, it is possible to improve the durability of the acoustic diaphragm it can.

1 the acoustic diaphragm 2 diaphragm portion 3, 103 edge portion 20 inner joint tube portion 30, 130 outer joint tube portion 51 the core metal mold 61 primary cavity mold (cavity mold)
62 secondary cavity mold (cavity mold)
For 10 acoustic member 110 diaphragm 120 gasket 120a the inner peripheral surface of the gasket (s face)
The lower end surface of the 120b gasket (multiple faces)
120c corners 130 edge 130a gate portion 140 roll unit 160 outer tube (connecting portion between the gasket, joint tube portion)
170 lower flange portion (connecting portion between the gasket)
180 first stepped portion 190 second step portion (step portion)
F Acoustic device frame O axis 201 ... acoustic member 203 ... gasket 203a ... lower end surface of the gasket (the junction surface of the junction)
204 ... edge 212 ... joint 246 ... pin gate 250 ... extended portion 251 ... stepped portion of the gasket edge (protrusion, protrusion)

Claims (12)

  1. A diaphragm portion which vibrates by receiving electrical signals or waves, and the edge portion which is circumferentially provided on the outer periphery of the diaphragm portion for supporting the diaphragm portion, the manufacturing method of the acoustic diaphragm comprising,
    The outer peripheral portion of the diaphragm portion, the inner joint tubular portion which is circumferentially along the outer edge of the vibrating section of the diaphragm portion is protruded,
    The inner peripheral portion of the edge portion, the outer joint tube portion provided around the outer periphery of the inner joint tube portion are projected,
    Method of manufacturing an acoustic diaphragm for joining the outer peripheral surface of the inner peripheral surface of the outer joint tube portion and the inner joint tube portion.
  2. The formed primary molding step of molding the diaphragm portion, and a secondary molding step of molding the edge portion, by two-color molding comprising,
    Method of manufacturing an acoustic diaphragm according to claim 1 for joining the outer peripheral surface of the inner joint tube portion and the inner peripheral surface of the outer joint tube portion by the two-color molding.
  3. The inner joint tube portion, the manufacturing method of the acoustic diaphragm according to claim 2 which is protruded toward the core mold side in the two-color molding.
  4. Said outer joint tube portion, the manufacturing method of the acoustic diaphragm according to claim 2 which is protruded toward the cavity mold side in the two-color molding.
  5. An annular gasket mounted to the acoustic device frame,
    Is joined to the gasket, and a manufacturing method of the acoustic member provided with an edge of the annular formed of a soft material than the material forming the gasket,
    To insert molding the edge two-color molding or the gaskets as insert article and the secondary molded product of the primary molded article Toshikatsu the edge of the gasket, is formed by,
    During injection molding of the edge, by flowing along a plurality of surfaces contiguous to each other among the molten resin surface of the gasket, and molding the edges and joined in succession to the plurality of surfaces,
    Part of the bonding portion between the gasket at the edge is, the manufacturing method of the acoustic member to molten resin during the injection molding of the edge there is a gate portion emitted.
  6. Manufacturing method of the acoustic member according to claim 5 wherein the plurality of surfaces which are continuous over the corner from each other in the gasket.
  7. At least one method of the acoustic member according to claim 5 which is located inside in the radial direction from the gate portion of the plurality of surfaces in the gasket.
  8. Junction between the gasket at the edge is provided with a joint tube portion outer circumferential surface is joined over the entire circumference on the inner peripheral surface of the gasket,
    The above edge, extends over a curved and the entire periphery in a dome shape in the axial direction of the acoustic member, the roll portion located inward in the radial direction from the joining tubular portion is provided,
    Manufacturing method of the acoustic member according to claim 5 in which the roll portion and said joint tube portion are connected via a step portion.
  9. An annular gasket mounted to the acoustic device frame,
    A manufacturing method of the acoustic member provided with an edge of the annular formed of a soft material than the material forming the and gasket bonded to the gasket,
    It said gasket is a primary molded product is formed by and insert molding the edges of the edge two-color molding of the secondary molded article, or the gasket as an insert article,
    During injection molding of said edge, said opening in the axial direction of the acoustic member, and then injecting a molten resin from a pin gate facing the joint surface between the gasket and the edge mold of the cavity, bonding the gasket is the wall thickness in the axial direction of the joint, and molded thicker than the thickness of the other portion which is disposed inward in the radial direction from the gasket,
    Continuously inward in the radial direction of the gasket, and the surface of the edge located on the front side of the opening direction of the pin gate, the bonding surface on the same plane, or in front of the opening direction of the pin gate than the junction surface manufacturing method of the acoustic member which is located on the side.
  10. Wherein the gasket extends along the axial direction, and a manufacturing method of the acoustic member according to claim 9 extending portion disposed radially outward of the junction portion.
  11. Wherein the junction surface between the joint portions in the gasket manufacturing method of the acoustic member according to claim 9 in which the convex portion toward the joining portion along the axial line direction within the cavity are projected.
  12. Wherein the junction surface between the joint portions in the gasket manufacturing method of the acoustic member according to claim 9, protrusion protruding inward in the radial direction from the gasket in the cavity is formed.
PCT/JP2011/058102 2010-03-30 2011-03-30 Method for manufacturing acoustic diaphragm WO2011122673A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2010079368A JP2011211640A (en) 2010-03-30 2010-03-30 Method of manufacturing acoustic member
JP2010-079368 2010-03-30
JP2010079367A JP2011211639A (en) 2010-03-30 2010-03-30 Method of manufacturing acoustic diaphragm
JP2010-079367 2010-03-30
JP2010094013A JP2011228783A (en) 2010-04-15 2010-04-15 Method for manufacturing acoustic member
JP2010-094013 2010-04-15

Publications (1)

Publication Number Publication Date
WO2011122673A1 true true WO2011122673A1 (en) 2011-10-06

Family

ID=44712366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/058102 WO2011122673A1 (en) 2010-03-30 2011-03-30 Method for manufacturing acoustic diaphragm

Country Status (1)

Country Link
WO (1) WO2011122673A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0174698U (en) * 1987-11-07 1989-05-19
JPH0666196U (en) * 1993-01-26 1994-09-16 北辰工業株式会社 speaker
JPH07503108A (en) * 1992-01-15 1995-03-30
JP2006319681A (en) * 2005-05-12 2006-11-24 Sanyo Electric Co Ltd Vibration cone and speaker unit using this

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0174698U (en) * 1987-11-07 1989-05-19
JPH07503108A (en) * 1992-01-15 1995-03-30
JPH0666196U (en) * 1993-01-26 1994-09-16 北辰工業株式会社 speaker
JP2006319681A (en) * 2005-05-12 2006-11-24 Sanyo Electric Co Ltd Vibration cone and speaker unit using this

Similar Documents

Publication Publication Date Title
US6171534B1 (en) Method of making a speaker cone and surround assembly
US6075866A (en) Electroacoustic transducer having axially extending corrugated supporting means for the diaphragm
JP2003249199A (en) Molded body having thin part
US6224801B1 (en) Method of making a speaker
US6757404B2 (en) Loud speaker, diaphragm and process for making the diaphragm
JP2004098886A (en) Automobile fuel tank and its manufacturing method
JPH08118421A (en) Two material molding method, mold assembly and speaker
EP0632674A1 (en) Diaphragm for use with an electro-acoustic transducer and method of producing the same
EP0492914A2 (en) Loudspeaker cone and surround assembly
US7263198B2 (en) Loudspeaker
US7604764B2 (en) Method of molding hollow component with high strength and sealability and the hollow component
JP2007133617A (en) Ic tag and its manufacturing method
US5243151A (en) Conical loudspeaker
JP2006191252A (en) Loudspeaker
JP2005159506A (en) Speaker
JPH09322289A (en) Speaker unit and its manufacture
US6468455B1 (en) Manufacturing method of sealing device
KR100788476B1 (en) Structure of high quality sound microspeaker
US8982486B2 (en) Image pickup lens unit manufacturing method and image pickup lens unit
US20110253713A1 (en) Plastic container and method of manufacturing the same
US20140169593A1 (en) High-output microspeaker
JPH0530592A (en) Dome speaker
JP2007032732A (en) Fitting and dust cover assembly, and its manufacturing method
JP2000224693A (en) Microspeaker and its production
JP2008155587A (en) Manufacturing method of hollow resin molded product

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11762897

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct app. not ent. europ. phase

Ref document number: 11762897

Country of ref document: EP

Kind code of ref document: A1