Loudspeaker and manufacturing method of loudspeaker

Abstract

The invention provides a speaker and a speaker manufacturing method. A connection line and a connection terminal are easily connected. A speaker (100) is provided with a connecting line (160) connecting a voice coil (121) and a connecting terminal (150), the connecting terminal (150) is provided with a base part (159), a first protruding part (151) and a second protruding part (152) which integrally protrude from the base part (159), and at least one of a boundary part between the base part (159) and the first protruding part (151) and a boundary part between the base part (159) and the second protruding part (152) is provided with a deformation part (154). The deformed part (154) is plastically deformed in the direction in which the first protruding part (151) and the second protruding part (152) approach each other.

Description

Technical Field

[0001] The present disclosure relates to a speaker and a method for manufacturing the speaker. Background Art

[0002] In a speaker, there is a case where a brocade wire having high durability and high flexibility is used to connect between a voice coil and a terminal for external connection. Conventionally, the terminal and the brocade wire are mostly connected by soldering. In addition, Patent Document 1 discloses a technique of connecting a terminal and a brocade wire by caulking a portion of the terminal disposed around an end portion of the brocade wire. Patent Document 2 discloses a technique of connecting a brocade wire and a terminal by pressing the brocade wire into a slit provided in the terminal and using the elastic force of the terminal.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2001-069593

[0006] Patent Document 2: Japanese Utility Model Publication No. 58-060869 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, operations such as soldering when connecting a brocade wire and a terminal, and caulking in a manner of covering an end portion of the brocade wire are difficult to automate, and thus are manually performed, which hinders the efficiency of the speaker assembly operation. In addition, as a method of connecting a brocade wire and a terminal, there is soldering, but the soldering process is difficult to automate. In such a situation, there is an expectation of automating the connection between the brocade wire and the terminal at low investment and low cost.

[0009] The present disclosure provides a speaker and a method for manufacturing a speaker that can simplify the connection structure between a brocade wire and a terminal for external connection.

[0010] Solutions to the Problems

[0011] The present disclosure relates to a loudspeaker. The loudspeaker includes: a magnetic circuit having a magnetic gap; a voice coil disposed in the magnetic gap; a diaphragm to which the voice coil is attached; a frame that holds the magnetic circuit and the diaphragm; a connection terminal attached to the frame; and a connection wire that connects the voice coil and the connection terminal. The connection terminal includes: a base; a first protrusion integrally protruding from the base; and a second protrusion integrally protruding from the base with a gap from the first protrusion. At least one of a boundary portion between the base and the first protrusion and a boundary portion between the base and the second protrusion has a deformed portion that plastically deforms in a direction approaching the first protrusion and the second protrusion.

[0012] In addition, the present disclosure relates to a method of manufacturing a loudspeaker. The loudspeaker includes: a magnetic circuit having a magnetic gap; a voice coil disposed in the magnetic gap; a diaphragm to which the voice coil is attached; a frame that holds the magnetic circuit and the diaphragm; a connection terminal attached to the frame; and a connection wire that connects the voice coil and the connection terminal. The connection terminal includes: a base; a first protrusion integrally protruding from the base; and a second protrusion integrally protruding from the base with a gap from the first protrusion. At least one of the first protrusion and the second protrusion has a recess at a position spaced a first distance from the base in a protruding direction of the first protrusion and the second protrusion. The recess is recessed in an arrangement direction of the first protrusion and the second protrusion and holds the connection wire therebetween. The connection wire arranged to cross the arrangement direction is inserted into a gap between the first protrusion and the second protrusion, the connection wire is temporarily held in the recess, and the connection terminal is caulked so that a protruding end of the first protrusion approaches a protruding end of the second protrusion to crimp the connection wire in the recess.

[0013] Effects of the Invention

[0014] According to the present disclosure, the terminal and the connection wire can be easily connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional perspective view of a loudspeaker according to an embodiment, with a part omitted.

[0016] Figure 2 is a cross-sectional view of a loudspeaker according to an embodiment.

[0017] Figure 3 is a perspective view showing the vicinity of a terminal block.

[0018] Figure 4 is a top view showing a part of a connection terminal before plastic deformation.

[0019] Figure 5 It is a plan view showing a part of the connecting terminal after plastic deformation.

[0020] Figure 6 It is a perspective view showing a state in which the holding portion holds the end portion of the connecting wire.

[0021] Figure 7 It is a perspective view showing a state where the connection wire is temporarily fixed to the connection terminal.

[0022] Description of Reference Numerals

[0023] 100. speaker; 110. magnetic circuit; 111. magnetic gap; 112. magnet; 113. top plate; 114. bottom plate; 115. center column; 120. voice coil body; 121. voice coil; 122. bobbin; 130. vibration plate; 131. edge; 132. cover; 140. frame; 141. inner member; 142. outer member; 143. connecting member; 144. connector; 145. terminal block; 146. retaining portion; 147. restraining portion; 150. connecting terminal; 151. first protrusion; 152. second protrusion; 153. recess; 154. deformation portion; 155. first abutting portion; 156. second abutting portion; 157. tapered portion; 159. base; 160. connecting wire; 170. centering support piece (damper); 200. fixture. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the loudspeaker and the method for manufacturing the loudspeaker of the present invention will be described with reference to the accompanying drawings. In addition, the following embodiments are examples for the purpose of illustrating the present invention, and are not intended to limit the present invention. For example, the shapes, structures, materials, constituent elements, relative positional relationships, connection states, numerical values, formulas, the contents of each stage in the method, the order of each stage, etc. shown in the following embodiments are examples, and sometimes include contents not described below. In addition, geometric expressions such as parallel and orthogonal are sometimes used, but these expressions do not indicate mathematical rigor, but include errors, deviations, etc. that are substantially allowed. In addition, expressions such as simultaneous and identical also include substantially allowed ranges.

[0025] In addition, the accompanying drawings are schematic drawings that are appropriately emphasized, omitted, or adjusted in proportion to illustrate the present invention, and are different from the actual shapes, positional relationships, and proportions. In addition, the X-axis, Y-axis, and Z-axis sometimes shown in the accompanying drawings represent orthogonal coordinates arbitrarily set for the purpose of illustrating the accompanying drawings. In other words, the Z-axis is not limited to an axis along the vertical direction, and the X-axis and Y-axis are not limited to being in the horizontal plane.

[0026] In addition, multiple inventions are sometimes generally described by one embodiment below. In addition, a part of the content described below is described as any constituent element related to the present invention.

[0027] Figure 1 It is a cross-sectional perspective view of a speaker showing an embodiment without a diaphragm. Figure 2 It is a cross-sectional view of a speaker of an embodiment. In addition, Figure 2 shows Figure 1 the cross-section of the line I-I shown. In addition, in Figure 2 it does not appear in the cross-section, but connection lines and terminals are marked.

[0028] The speaker 100 only needs to convert an electrical signal into sound, and is not particularly limited. In the case of this embodiment, the speaker 100 is a speaker installed in a moving body such as an automobile, and is a small speaker that can be buried in a limited space inside the moving body. In addition, in this specification, "small" sometimes means a speaker with an inner diameter of the frame 140 of 10 cm or less. The speaker 100 includes a magnetic circuit 110, a voice coil 121, a diaphragm 130, a frame 140, connection terminals 150, and connection lines 160.

[0029] The magnetic circuit 110 generates a stable magnetic flux. The stable magnetic flux generated by the magnetic circuit 110 acts on the magnetic flux that changes based on the electrical signal input to the voice coil body 120. The magnetic circuit 110 is installed in the frame 140 so as to be located behind the diaphragm 130, and has an annular magnetic gap 111 facing the diaphragm 130. The magnetic gap 111 is a gap for generating a stable magnetic flux along a direction crossing the magnetic flux generated in the voice coil body 120.

[0030] In the case of this embodiment, the magnetic circuit 110 is an external magnetic type, and includes: a magnetized cylindrical magnet 112; an annular top plate 113 disposed on the surface of the magnet 112 on the side of the diaphragm 130; a circular plate-shaped bottom plate 114 disposed on the side opposite to the top plate 113 with respect to the magnet 112; and a center post 115 inserted into the through hole of the top plate 113 from the central portion of the bottom plate 114, and a magnetic gap 111 is formed between the center post 115 and the top plate 113. In addition, the bottom plate 114 and the center post 115 are integrally formed.

[0031] The top plate 113, the bottom plate 114, and the center post 115 are made of a magnetic material. The magnet 112 is preferably a neodymium-based magnet or the like having a high magnetic energy. Thereby, the thickness of the magnet 112 can be reduced, and the thickness of the entire speaker 100 can be reduced. Moreover, weight reduction can also be achieved.

[0032] The magnet 112 is a permanent magnet in the shape of an annular plate with a through hole formed in the center for the center post 115 to pass through. In the magnet 112, one end in the thickness direction (the reel direction of the voice coil 121) is the N pole, and the other end is the S pole. A top plate 113 is fixed to the surface on one pole side of the magnet 112, and a bottom plate 114 is fixed to the surface on the other pole side. The fixing method of the top plate 113, the magnet 112, and the bottom plate 114 is not particularly limited. In the case of this embodiment, it is fixed using an adhesive. In addition, fastening members such as screws and rivets can also be used for fixing.

[0033] In addition, the form of the magnetic circuit 110 provided in the speaker 100 is not particularly limited, and an internal magnetic type magnetic circuit 110 or the like can also be adopted.

[0034] The voice coil 121 is a component disposed in the magnetic gap 111 of the magnetic circuit 110 and attached to the diaphragm 130. The voice coil 121 generates magnetic flux based on the input electrical signal and vibrates in the reel direction by the interaction with the magnetic flux generated by the magnetic circuit 110.

[0035] The reel (central axis) of the voice coil 121 is disposed in the direction of vibration (amplitude) of the diaphragm 130 and is orthogonal to the direction of the magnetic flux in the magnetic gap 111.

[0036] The voice coil 121 is formed by winding a single metallic wire into a multi-turn loop (cylindrical shape). In the case of this embodiment, the voice coil body 120 is formed by the voice coil 121 and the bobbin 122 around which the voice coil 121 is wound. The bobbin 122 is a cylindrical member made of materials such as aluminum and resin. The voice coil 121 is connected to the diaphragm 130 via the bobbin 122. The ends of a pair of connection wires 160 electrically connected to the voice coil 121 are mechanically mounted from the voice coil body 120. In the case of this embodiment, the connection wires 160 are made of brocade silk.

[0037] The brocade silk is a type of lead wire and has a structure that is softer and more resistant to repeated bending compared to polyvinyl chloride insulated wire, litz wire, etc. Since the brocade silk is not likely to apply stress to the vibration of the voice coil body 120, the influence of the connection wires 160 on the sound characteristics can be suppressed. Specifically, for the brocade silk, a structure in which multiple wires formed by winding copper foil into a wire are twisted together can be exemplified.

[0038] In addition, the speaker 100 may not have the bobbin 122 and directly mount the voice coil 121 on the diaphragm 130.

[0039] In addition, in the case of the present embodiment, a centering suspension 170 is mounted on the voice coil body 120. The centering suspension 170 is a member having flexibility and restorability, with its inner peripheral portion mounted on the voice coil body 120 and its outer peripheral portion mounted on the frame 140. The centering suspension 170 has a shape with concentric undulations. The centering suspension 170 assists the linear movement of the voice coil body 120 in the reel direction of the voice coil 121. In addition, in order to lower the lowest resonance frequency of the speaker 100 and improve the sound quality, the centering suspension may be omitted. Alternatively, the centering suspension 170 may be mounted on the diaphragm 130 instead of the voice coil body 120.

[0040] The diaphragm 130 is a member connected to the voice coil 121, and is a member that vibrates the air to generate sound by displacing in the reel direction with respect to the neutral position based on the vibration of the voice coil 121. In the case of the present embodiment, the shape of the diaphragm 130 is a so-called conical shape. The outer peripheral portion of the diaphragm 130 is mounted on the end face of the wall portion of the frame 140 via an edge 131 having flexibility and restorability compared to the shape of the diaphragm 130. A hole for the bobbin 122 to pass through is provided in the central portion of the diaphragm 130. A dome-shaped cover 132 that covers the hole in the central portion is mounted on the diaphragm 130.

[0041] In addition, the shape of the diaphragm 130 is not particularly limited, and examples include a conical shape, an elliptical conical shape, and a pyramidal shape. Alternatively, it may be a flat shape such as a circular plate, an elliptical plate, or a flat plate. The material constituting the diaphragm 130 is not particularly limited, and examples include paper and resin.

[0042] The frame 140 is a member that holds the magnetic circuit 110, the voice coil body 120, and the centering suspension 170. In the case of the present embodiment, the frame 140 includes a bottomed cylindrical inner member 141 that holds the magnetic circuit 110 and the centering suspension 170, an annular (cylindrical) outer member 142 disposed on the outer periphery of the diaphragm 130, and a plurality of rod-shaped connecting members 143 that bridge the inner member 141 and the outer member 142. The inner member 141, the outer member 142, and the connecting members 143 are integrally formed of resin.

[0043] A connector portion 144 that protrudes radially outward from the outer peripheral surface is integrally mounted on the outer member 142. In addition, a terminal block 145 that protrudes inward is mounted on the outer member 142 on the side opposite to the connector portion 144.

[0044] The outer peripheral portion of the diaphragm 130 is attached to one end portion (the end portion on the Z+ side in the figure) of the outer member 142 via the edge 131 using an adhesive or the like. The magnetic circuit 110 is installed in the inner member 141 in a housed state. The outer member 142 and the inner member 141 are fixedly connected by the connecting member 143. According to the above, the diaphragm 130 is disposed at a prescribed position with respect to the magnetic circuit 110.

[0045] The material forming the frame 140 is not particularly limited. In the case of the present embodiment, the frame 140 is a resin molded product. The bottomed cylindrical inner member 141, the connector portion 144, and the terminal block 145 are integrally formed of resin. A holding portion 146 is integrally provided at a position of the terminal block 145 on the side closer to the voice coil body 120. A restraining portion 147 is integrally provided between the voice coil body 120 and the terminal block 145 inside the inner member 141. The restraining portion 147 does not fixedly hold the connection wire 160 but loosely restrains the movement of the connection wire 160. Further, when forming the frame 140, a pair of connection terminals 150 are installed in a state of penetrating from the terminal block 145 of the outer member 142 to the connector portion 144 by insert molding.

[0046] The connector portion 144 is a portion for connecting the speaker 100 to an amplifier or the like. In the case of the present embodiment, by inserting the male connector provided at the tip of the output cable of the amplifier into the connector portion 144, the male connector can be electrically connected to the connection terminal 150 protruding inwardly in the connector portion 144. Thereby, the sound signal output from the amplifier can be input to the voice coil 121 via the connection wire 160.

[0047] Figure 3 It is a perspective view showing the vicinity of the terminal block. As Figure 3 shown, the terminal block 145 holds the connection terminal 150 protruding at a prescribed position inside the outer member 142 of the frame 140. The terminal block 145 is in a cantilever shape protruding from the inner peripheral surface of the outer member 142 toward the voice coil body 120.

[0048] A pair of holding portions 146 for holding the tip portions of a pair of connection wires 160 extending from the voice coil body 120 are disposed at positions on the side closer to the diaphragm 130 (the Z+ side in the figure) of the pair of connection terminals 150 protruding from the terminal block 145. The holding portion 146 has a slit and is disposed such that the slit of the holding portion 146 and the gap of the connection terminal 150 are included in the same plane.

[0049] Figure 4 It is a top view showing the connection terminal 150 before plastic deformation. Figure 5is a top view showing the connection terminal 150 after plastic deformation. The connection terminal 150 is a member that is electrically connected to the connection line 160 by structurally holding the connection line 160. The connection terminal 150 includes a base portion 159, a first protrusion 151 integrally protruding from the base portion 159, and a second protrusion 152 integrally protruding from the base portion 159 with a gap from the first protrusion 151.

[0050] The base portion 159 is a portion that protrudes from the terminal block 145 and serves as a structural basis, and is the portion from the terminal block 145 to the first protrusion 151 and the second protrusion 152.

[0051] At least one of the first protrusion 151 and the second protrusion 152 (both in the case of this embodiment) is provided with a recess 153 at a position spaced a first distance L1 from the base portion 159 in the protruding direction (Z-axis direction in the figure) of the first protrusion 151 and the second protrusion 152. The recess 153 is recessed in the direction in which the first protrusion 151 and the second protrusion 152 are arranged (Y-axis direction in the figure) and holds the connection line 160 in a clamped manner. The shape of the recess 153 when viewed from above is not limited. In the case of this embodiment, the recess 153 is an arc shape along the outer peripheral surface of the connection line 160. A pair of recesses 153 recessed so as to be separated from each other in a relative state are set to such a distance before the connection terminal 150 is caulked: the connection line 160 is hardly deformed and the connection line 160 can be held loosely. On the other hand, after the connection terminal 150 is caulked, the distance between the pair of recesses 153 is set to such a distance: the connection line 160 is compressed tightly and the connection line 160 does not shift relative to the connection terminal 150 even when the speaker 100 is driven. In addition, the shape of the recess 153 when viewed from above may also be a part of a circumscribed polygon of the outer peripheral surface of the connection line 160 or the like.

[0052] In at least one of the boundary portions between the base portion 159 and the first protrusion 151 and the boundary portion between the base portion 159 and the second protrusion 152 of the connection terminal 150 (both in the case of this embodiment), there is a deformed portion 154 that plastically deforms in the direction approaching the first protrusion 151 and the second protrusion 152. The deformed portion 154 is a portion generated by so-called caulking the connection terminal 150. In Figure 5 the deformed portion 154 is shown by an oval dotted line, but this does not clearly show the position of the plastically deformed portion 154.

[0053] In the connection terminal 150, by manufacturing the first protrusion 151 and the second protrusion 152 at a predetermined interval as shown in Figure 4 and as shown in Figure 5Tightening is performed in the direction in which the interval between the first protrusion 151 and the second protrusion 152 becomes narrower (the Y-axis direction in the figure), thereby generating a deformed portion 154. In the case of the present embodiment, in the first protrusion 151 and the second protrusion 152, at positions where the second distance L2 (refer to Figure 4 ) which is farther from the base portion 159 than the first distance L1 in the protruding direction (the X− direction in the figure), a first abutting portion 155 and a second abutting portion 156 that abut against each other and restrict the force for clamping the connection line 160 by the recess 153 are provided respectively. When tightening the connection terminal 150, portions other than the first abutting portion 155 and the second abutting portion 156 do not come into contact with respect to the first protrusion 151 and the second protrusion 152. According to the above, when tightening the connection terminal 150, the tightening operation is ended by the abutment of the first abutting portion 155 and the second abutting portion 156, so that even when tightening a plurality of connection terminals 150, the compression amount (length) of the connection line 160 can be maintained constant. In addition, at the stage of designing the shape of the connection terminal 150, when the distance between the first abutting portion 155 and the second abutting portion 156 before tightening is set to D, the compression amount (length) T of the connection line 160 can be simply derived using the formula T = D×(L1 / L2) (× means multiplication, / means division). In addition, the compression amount of the connection line 160 is not limited. For example, the following case can be exemplified: by the abutment of the first abutting portion 155 and the second abutting portion 156, the connection line 160 is held by the connection terminal 150 in a state where it is compressed in the range of 10% or more and less than 40% of the wire diameter between the pair of recesses 153.

[0054] Conical portions 157 are provided at mutually opposing portions of at least one (both in the case of the present embodiment) of the first protrusion 151 and the second protrusion 152, and the gap becomes wider as the conical portions 157 go from the position where the recesses 153 are provided toward the top ends (the X− side ends in the figure). The interval between the ends of the conical portions 157 on the side closer to the base portion 159 is set to be shorter than the diameter of the connection line 160. By providing the conical portions 157, when inserting the connection line 160 from the top ends of the first protrusion 151 and the second protrusion 152 through between the first protrusion 151 and the second protrusion 152 toward the recesses 153, due to the elasticity of the connection terminal 150, the space between the first protrusion 151 and the second protrusion 152 is gradually pushed open, and the connection line 160 passes over the ends of the conical portions 157 on the side closer to the base portion 159 and reaches the recesses 153, thereby temporarily fixing the connection line 160 in the recesses 153.

[0055] The material of the connection terminal 150 is not limited as long as it has conductivity and can be plastically deformed. In the case of this embodiment, the connection terminal 150 is made of metal. In addition, the connection terminal 150 is manufactured by punching a metal plate that extends in a plane including the protruding direction and the arrangement direction of the first protrusion 151 and the second protrusion 152.

[0056] Next, use Figure 6 , Figure 7 and Figure 3 to describe a method of manufacturing the speaker 100 by mechanically and electrically connecting the connection wire 160 and the connection terminal 150.

[0057] First, as Figure 6 shows, the top ends of a pair of connection wires 160 that extend from the voice coil 121 toward the outer member 142 through the restraint portion 147 are respectively clamped into the slits of a pair of holding portions 146 and held by the holding portions 146. Next, the outer periphery of the connection wire 160 is disposed between the top ends of the first protrusion 151 and the second protrusion 152 of the connection terminal 150. In addition, in the case of this embodiment, the slits of the holding portion 146 and the gap of the connection terminal 150 are arranged in the same plane. Therefore, at the stage of holding the connection wire 160 by the holding portion 146, the connection wire 160 can be wired as Figure 6 shows.

[0058] Next, use Figure 7 shown jig 200, the robotic arm, etc. to press down the pair of connection wires 160 erected between the connection terminal 150 and the restraint portion 147 respectively (or simultaneously) downward ( Figure 7 the direction of arrow A in, the side opposite to the connection terminal 150 and the holding portion 146). As a result, the outer peripheral surface of the connection wire 160 moves toward the base portion 159 between the first protrusion 151 and the second protrusion 152 of the connection terminal 150 and is embedded in the recess 153 through the narrowest space between the pair of tapered portions 157. According to the above description, the connection wire 160 is temporarily fixed to the connection terminal 150.

[0059] Next, along Figure 7 the direction indicated by arrow B shown, the first protrusion 151 and the second protrusion 152 of the connection terminal 150 are tightened until the first abutting portion 155 abuts against the second abutting portion 156. According to the above situation, as Figure 3 shows, the connection wire 160 is mechanically held by the connection terminal in a compressed state between the pair of recesses 153, and the electrical connection between the connection wire 160 and the connection terminal 150 is ensured. In addition, a plastically deformed deformed portion 154 is formed at the boundary portion between the base portion 159 and the first protrusion 151 and at the boundary portion between the base portion 159 and the second protrusion 152.

[0060] The method of mechanically and electrically connecting the above-mentioned connection line 160 and the connection terminal 150 can be automatically and easily implemented using a robot or the like.

[0061] In addition, the present invention is not limited to the above-described embodiments. For example, other embodiments that can be achieved by arbitrarily combining the constituent elements described in this specification or removing several constituent elements can also be regarded as embodiments of the present invention. In addition, modification examples obtained by making various modifications that occur to those skilled in the art to the above-described embodiments within the scope not departing from the gist of the present invention, that is, the meaning expressed by the statements described in the claims, are also included in the present invention.

[0062] For example, the case where a pair of connection lines 160 and a pair of connection terminals 150 are connected simultaneously using the jig 200 has been described, but the connection lines 160 may also be connected to the connection terminals 150 one by one.

[0063] In addition, the case where the connection line 160 is connected to the connection terminal 150 after the holding portion 146 holds the end portion of the connection line 160 has been described, but the connection line 160 may also be connected to the connection terminal 150 while the second jig holds the end portion of the connection line 160. That is, the speaker 100 may not include the holding portion 146.

[0064] In addition, not only can the connection terminal 150 mounted on the frame 140 be connected to the connection line 160, but the connection terminal 150 may also be mounted on the frame 140 after the connection line 160 and the connection terminal 150 are connected.

[0065] In addition, the speaker 100 having the centering washer 170 has been exemplified, but the speaker 100 may not have the centering washer 170.

[0066] In addition, in the embodiment, the case where the connection terminal 150 has the concave portion 153 has been described, but the connection terminal 150 may not have the concave portion 153.

[0067] In addition, in the embodiment, the case where the connection terminal 150 has the tapered portion 157 has been described, but the connection terminal may also be such that at least one of the mutually opposing surfaces of the first protrusion 151 and the second protrusion 152 is bent. The bending includes an R shape, and it may be not only a flat plate but also a three-dimensional shape. Thereby, the strength of the connection state can be improved, and in addition, the productivity in the automatic connection process between the connection line 160 and the connection terminal 150 can be increased.

[0068] [Summary]

[0069] The loudspeaker 100 of the first aspect of the present disclosure includes: a magnetic circuit 110 having a magnetic gap 111; a voice coil 121 disposed in a state of being inserted into the magnetic gap 111; a diaphragm 130 to which the voice coil 121 is attached; a frame 140 that holds the magnetic circuit 110 and the diaphragm 130; a connection terminal 150 attached to the frame 140; and a connection wire 160 that connects the voice coil 121 and the connection terminal 150. The connection terminal 150 includes: a base portion 159; a first protrusion 151 that protrudes integrally from the base portion 159; and a second protrusion 152 that protrudes integrally from the base portion 159 with a gap from the first protrusion. At least one of the boundary portions between the base portion 159 and the first protrusion 151 and between the base portion 159 and the second protrusion 152 has a deformed portion 154 that plastically deforms in a direction approaching the first protrusion 151 and the second protrusion 152.

[0070] According to the first aspect, it is possible to easily connect the connection wire 160 such as a brocade wire extending from the voice coil body 120 and the connection terminal 150.

[0071] The loudspeaker 100 of the second aspect includes the first aspect. In the connection terminal 150, at least one of the first protrusion 151 and the second protrusion 152 has a recess 153 at a position spaced apart from the base portion 159 by a first distance in the protruding direction of the first protrusion 151 and the second protrusion 152. The recess 153 is recessed in the arrangement direction of the first protrusion 151 and the second protrusion 152 and clamps the connection wire 160.

[0072] According to the second aspect, the connection wire 160 can be temporarily held in the recess 153, and the connection wire 160 can be easily connected to the connection terminal 150. Temporary holding includes a case where the connection wire 160 is held in a state of being compressed to a certain extent, and a case where the connection wire 160 is held by friction or the like without compressing the connection wire 160.

[0073] The loudspeaker 100 of the third aspect includes the second aspect. In the first protrusion 151 and the second protrusion 152, a first abutting portion 155 and a second abutting portion 156 are provided at positions spaced apart from the base portion 159 by a second distance farther than the first distance L1 in the protruding direction. The first abutting portion 155 and the second abutting portion 156 abut against each other to limit the force for clamping the connection wire 160 by the recess 153.

[0074] According to the third aspect, by tightening the connection terminal 150, the force applied to the connection wire 160 can be maintained within a specified range. Thereby, it is possible to stably manufacture the loudspeaker 100 having specified performance.

[0075] The loudspeaker 100 in the fourth form includes the third form, wherein the connection line 160 is held by the connection terminal 150 in a state of being compressed in the recess 153 by the abutment of the first abutting portion 155 and the second abutting portion 156.

[0076] According to the fourth form, it is possible to ensure a desired connection strength and a desired conductivity between the connection line 160 and the connection terminal 150.

[0077] The loudspeaker 100 in the fifth form includes any one of the first form to the third form, wherein at least one of the first protrusion 151 and the second protrusion 152 has a tapered portion 157, and the gap becomes wider as the tapered portion 157 goes from the position where the recess 153 is disposed toward the top end.

[0078] According to the fifth form, when temporarily fixing the connection line 160 to the connection terminal 150, it is possible to move the connection line 160 while widening the gap between the first protrusion 151 and the second protrusion 152, and dispose the connection line 160 between the pair of recesses 153.

[0079] The loudspeaker 100 in the sixth form includes the first form or the second form, wherein at least one of the mutually opposing surfaces of the first protrusion 151 and the second protrusion 152 is curved.

[0080] According to the sixth form, it is possible to improve the strength of the connection state, and in addition, it is possible to improve the productivity in the automatic connection process between the connection line 160 and the connection terminal 150.

[0081] The loudspeaker 100 in the seventh form includes any one of the first form to the sixth form, wherein the connection terminal 150 is in a plate shape that expands in a plane including the protruding direction and the arrangement direction.

[0082] According to the seventh form, it is possible to easily and inexpensively manufacture the connection terminal 150.

[0083] The loudspeaker 100 in the eighth form includes any one of the first form to the seventh form, wherein the frame 140 has a holding portion 146 that holds one end portion of the connection line 160 held by the connection terminal 150.

[0084] According to the eighth form, by first making the holding portion 146 hold the end portion of the connection line 160, it is possible to easily temporarily fix the connection line 160 to the connection terminal 150. In particular, it is useful when automatically connecting the connection line 160 and the connection terminal 150 using a robot or the like.

[0085] The loudspeaker 100 in the ninth form includes any one of the first form to the eighth form, wherein the frame 140 has a restraining portion 147 that loosely restrains the other end portion of the connection line 160 on the side of the voice coil 121.

[0086] According to the ninth aspect, when the speaker 100 is driven, the vibration of the connection line 160 can be controlled within a specified range, and the influence on the characteristics of the speaker 100 can be suppressed.

[0087] The speaker 100 according to the tenth aspect includes any one of the first to ninth aspects, wherein the connection line 160 is a brocade wire or a gold wire.

[0088] The manufacturing method of the speaker according to the eleventh aspect is the manufacturing method of the speaker 100, and the speaker 100 includes: a magnetic circuit 110 having a magnetic gap; a voice coil 121 disposed in a state of being inserted into the magnetic gap 111; a diaphragm 130 to which the voice coil 121 is attached; a frame 140 that holds the magnetic circuit 110 and the diaphragm 130; a connection terminal 150 attached to the frame 140; and a connection line 160 that connects the voice coil 121 and the connection terminal 150. The connection terminal 150 includes: a base portion 159; a first protrusion 151 integrally protruding from the base portion 159; and a second protrusion 152 integrally protruding from the base portion 159 with a gap from the first protrusion 151. At least one of the first protrusion 151 and the second protrusion 152 has a recess 153 at a position spaced from the base portion 159 by a first distance L1 in the protruding direction of the first protrusion 151 and the second protrusion 152. The recess 153 is recessed in the arrangement direction of the first protrusion 151 and the second protrusion 152 and holds the connection line 160. The connection line 160 arranged to cross the arrangement direction is inserted into the gap between the first protrusion 151 and the second protrusion 152, and the connection line 160 is temporarily held in the recess 153, and the connection terminal 150 is caulked so that the protruding end portion of the first protrusion 151 approaches the protruding end portion of the second protrusion 152, and the connection line 160 is crimped to the recess 153.

[0089] According to the eleventh aspect, it is possible to easily connect the connection line 160 such as a brocade wire extending from the voice coil body 120 and the connection terminal 150.

[0090] Industrial applicability

[0091] The present disclosure is useful for a speaker having a voice coil, a connection terminal, and a connection terminal for introducing a sound signal from the outside to the inside of the frame, and a manufacturing method thereof.

Claims

1. A loudspeaker, wherein: The speaker features: a magnetic circuit having a magnetic gap; a voice coil arranged to be inserted into the magnetic gap; a vibration plate on which the voice coil is mounted; a frame that holds the magnetic circuit and the vibration plate; A connecting terminal mounted on the frame; as well as a connecting wire connecting the voice coil and the connecting terminal, The connecting terminal has: base; a first protrusion integrally protruding from the base; as well as a second protrusion which integrally protrudes from the base with a gap therebetween; At least one of a boundary portion between the base and the first protrusion and a boundary portion between the base and the second protrusion includes a deformation portion that plastically deforms in a direction in which the first protrusion and the second protrusion approach each other.

2. The loudspeaker according to claim 1, wherein At least one of the first protrusion and the second protrusion includes a recessed portion at a position a first distance from the base in a protruding direction of the first protrusion and the second protrusion, the recessed portion being recessed in an arrangement direction of the first protrusion and the second protrusion to clamp the connection line.

3. The loudspeaker according to claim 2, wherein: The first protrusion and the second protrusion have first and second abutment portions at positions a second distance away from the base portion in the protruding direction that is longer than the first distance. The first and second abutment portions abut against each other to limit the force of clamping the connection line by the recess.

4. The loudspeaker according to claim 3, wherein: The connecting wire is held by the connecting terminal in a state of being compressed in the recessed portion due to the contact between the first contact portion and the second contact portion.

5. The loudspeaker according to claim 2, wherein: At least one of the first protrusion and the second protrusion includes a tapered portion, and the gap widens as the tapered portion goes from a position where the recess is arranged toward a tip.

6. The loudspeaker according to claim 1 or 2, wherein: At least one of mutually opposing surfaces of the first protrusion and the second protrusion is curved.

7. The loudspeaker according to claim 1 or 2, wherein: The connection terminal has a plate shape that expands on a surface including a protruding direction of the first protrusion and the second protrusion and an arrangement direction of the first protrusion and the second protrusion.

8. The loudspeaker according to claim 1 or 2, wherein: The frame includes a holding portion that holds one end portion of the connection wire held by the connection terminal.

9. The loudspeaker according to claim 1 or 2, wherein: The frame includes a restraint portion that loosely restrains the other end portion of the connecting wire on the voice coil side.

10. The loudspeaker according to claim 1 or 2, wherein: The connecting wire is a brocade wire or a gold wire.

11. A method for manufacturing a speaker, the speaker comprising: a magnetic circuit having a magnetic gap; a voice coil arranged to be inserted into the magnetic gap; and a vibration plate, the voice coil being mounted on the vibration plate; a frame that holds the magnetic circuit and the vibration plate; A connecting terminal mounted on the frame; and a connecting wire connecting the voice coil and the connecting terminal, wherein the connecting terminal comprises: a base; a first protrusion protruding integrally from the base; and a second protrusion protruding integrally from the base with a gap therebetween, wherein: inserting the connection line arranged to intersect the arrangement direction of the first protrusion and the second protrusion into the gap between the first protrusion and the second protrusion, The connection terminal is crimped so that the protruding end of the first protrusion and the protruding end of the second protrusion come close to each other, thereby crimping the connection wire.

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