speaker

Abstract

To simplify the assembly process of a speaker.SOLUTION: A speaker 100 comprises: a magnetic circuit 110 that includes a magnetic gap 111; a voice coil body 120 that is inserted into the magnetic gap 111; a diaphragm 130 that is attached to the voice coil body 120; transmission members 150 that are arranged on the lateral sides of the magnetic circuit 110 along the magnetic circuit 110 at a predetermined interval, and transmit electric signals input to the voice coil body 120; and a resin housing 140 that is integrated with the magnetic circuit 110 and the transmission members 150. The transmission members 150 each include an outer exposed part 151 and an inner exposed part 152.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to speakers that convert electrical signals into sound. [Background technology]

[0002] As described in Patent Document 1, a speaker has been proposed in which a magnetic circuit and a resin housing are integrated by insert molding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-316843 Summary of the Invention [Problem to be solved by the invention]

[0004] Speakers are equipped with connection terminals for connecting to external wiring, but if the external wiring connected to the speaker is pulled, the speaker's connection terminal or the plastic part to which the connection terminal is attached may be damaged.

[0005] An object of the present disclosure is to provide a speaker that is resistant to pulling on external wiring, etc. [Means for solving the problem]

[0006] The speaker of the present disclosure comprises a magnetic circuit with a magnetic gap, a voice coil body inserted into the magnetic gap, a diaphragm attached to the voice coil body, a transmission member arranged along the side of the magnetic circuit at a predetermined interval and transmitting an electrical signal input to the voice coil body, and a resin housing integrated with the magnetic circuit and the transmission member, the transmission member having an outer exposed portion exposed to the outside of the housing and an inner exposed portion exposed to the inside of the housing. Effect of the Invention

[0007] In the speaker of the present disclosure, the transmission member extending along the magnetic circuit is integrated into a resin housing, making it possible to prevent damage to the speaker even if a pulling force or other force is applied to the exposed part. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a speaker according to an embodiment, viewed from the front. [Diagram 2] FIG. 2 is a perspective view showing the speaker according to the embodiment from the rear side. [Diagram 3] FIG. 3 is a cross-sectional view of the speaker according to the embodiment. [Figure 4] FIG. 4 is a perspective view showing the positional relationship of the magnetic circuit, transmission members, etc., with the housing omitted. [Diagram 5] FIG. 5 is a perspective view showing the damper, the voice coil body, and the transmission member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a speaker according to the present disclosure will be described with reference to the drawings. Note that the following embodiment is an example for explaining the present disclosure, and is not intended to limit the present disclosure. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, mathematical expressions, contents of each step in the method, and the order of each step shown in the following embodiment are examples, and may include contents not described below. In addition, geometric expressions such as parallel and orthogonal may be used, but these expressions do not indicate mathematical strictness, and include substantially permissible errors, deviations, etc. In addition, expressions such as simultaneous and identical also include substantially permissible ranges.

[0010] In addition, the drawings are schematic diagrams in which emphasis, omissions, or ratios have been appropriately adjusted in order to explain the present disclosure, and the shapes, positional relationships, and ratios may differ from the actual ones.

[0011] In addition, in the following, a plurality of inventions may be collectively described as one embodiment. In addition, some of the contents described below are described as optional components related to the present disclosure.

[0012] A speaker according to one embodiment of the present disclosure comprises a magnetic circuit having a magnetic gap, a voice coil body inserted into the magnetic gap, a diaphragm attached to the voice coil body, a transmission member arranged along the side of the magnetic circuit at a predetermined interval and transmitting an electrical signal input to the voice coil body, and a resin housing integrated with the magnetic circuit and the transmission member, wherein the transmission member has an outer exposed portion exposed to the outside of the housing and an inner exposed portion exposed to the inside of the housing.

[0013] With this, the transmission member extending along the magnetic circuit is integrated into the housing, so that even if a pulling force or other such force is applied to the exposed part, damage to the speaker or falling off of the transmission member can be avoided.

[0014] FIG. 1 is a perspective view showing a speaker according to an embodiment from the front side. FIG. 2 is a perspective view showing a speaker according to an embodiment from the rear side. FIG. 3 is a cross-sectional view of the speaker according to an embodiment. As shown in these figures, the speaker 100 includes a magnetic circuit 110, a voice coil body 120, a diaphragm 130, a housing 140, and a transmission member 150. In the case of this embodiment, the speaker 100 includes a damper 160, a connection member 170, and a cover 180. In this specification and claims, the side of the diaphragm 130 with respect to the magnetic circuit 110 is referred to as the front side (Z+ side in the figure), and the opposite side of the diaphragm 130 is referred to as the rear side (Z- side in the figure).

[0015] In this embodiment, speaker 100 is exemplified as a speaker attached to a moving body such as an automobile. Speaker 100 is a small speaker that can be embedded in a limited space inside a moving body. In this specification, "small" may be used to mean a speaker whose housing 140 has an inner diameter of 10 cm or less. Although a small speaker is described, the present invention is not limited to this and may be applied to a large speaker.

[0016] Magnetic circuit 110 is a component that generates, in magnetic gap 111, a steady magnetic flux that acts on a magnetic flux that changes based on an electric signal input to voice coil body 120. Magnetic circuit 110 is attached integrally to housing 140 so as to be located behind diaphragm 130, and includes annular magnetic gap 111 that faces diaphragm 130. Magnetic gap 111 is an air gap that generates a steady magnetic flux in a direction that intersects with the magnetic flux generated in voice coil body 120.

[0017] In the present embodiment, magnetic circuit 110 is of an external magnet type and includes magnetized annular (cylindrical) magnet 112 arranged coaxially with the winding axis of voice coil body 120, annular front plate 113 arranged coaxially with the winding axis of voice coil body 120 on the surface of magnet 112 facing diaphragm 130, and rear member 114 arranged on the rear side opposite front plate 113 with respect to magnet 112. Rear member 114 includes center pole 115 that is inserted from the center into a through hole in front plate 113 and forms magnetic gap 111 between front plate 113 and rear member 114. Rear member 114 and center pole 115 are integrally formed.

[0018] The front panel 113 and the rear member 114 including the center pole 115 are made of a magnetic material. For the magnet 112, it is preferable to use a magnet having high magnetic energy, such as a neodymium magnet. This allows the thickness of the magnet 112 to be thin, and the overall thickness of the speaker 100 to be thin. Furthermore, weight reduction can be achieved. Alternatively, an external magnet type structure using a ferrite magnet may be used.

[0019] In the present embodiment, the magnet 112 is a permanent magnet having a through hole formed therein through which the center pole 115 is inserted. One end of the magnet 112 in the thickness direction (Z-axis direction in the drawing) is an N pole, and the other end is an S pole. A front plate 113 is fixed to a surface of one pole side of the magnet 112, and a rear member 114 is fixed to a surface of the other pole side. The outer diameter of the magnet 112 is set to be smaller than the outer diameter of the front plate 113. The outer diameter of the magnet 112 is also set to be smaller than the maximum diameter of the rear member 114 (excluding the center pole 115 portion). Specifically, the relationship in size between the outer diameters of the magnet 112, the front plate 113, and the rear member 114 is realized by setting the maximum value of the dimensional tolerance of the outer diameter of the magnet 112 to be smaller than the minimum value of the dimensional tolerance of the outer diameters of the front plate 113 and the rear member 114. When housing 140 is molded, the resin material is filled up to the outer circumferential surface of magnet 112, which is the recessed portion of magnetic circuit 110, and magnetic circuit 110 is firmly held in housing 140 by the anchor effect.

[0020] The tip of center pole 115 forms a magnetic gap, and the base end serves as positioning portion 116, which has a diameter longer than the tip and which positions magnet 112 to be inserted when assembling magnetic circuit 110. Magnet 112 and positioning portion 116 are in a gap-fit ​​state, and the dimensions of each are set so that the outer circumferential surface of magnet 112 does not protrude beyond the outer circumferential surfaces of rear member 114 and front plate 113 even when part of the inner circumferential surface of magnet 112 abuts against part of the outer circumferential surface of positioning portion 116.

[0021] Furthermore, center pole 115 has tapered portion 117 that narrows in diameter from positioning portion 116 toward the tip, preventing magnet 112 from being chipped when inserted into center pole 115.

[0022] Voice coil body 120 is a component having one end disposed within magnetic gap 111 of magnetic circuit 110 and the other end attached to diaphragm 130. It generates magnetic flux based on an input electrical signal and vibrates in the winding axis direction (Z-axis direction in the figure) due to interaction with the magnetic flux from magnetic circuit 110.

[0023] The winding axis (central axis) of voice coil body 120 is disposed in the direction of vibration (amplitude) of diaphragm 130 (Z-axis direction in the figure) and is perpendicular to the direction of magnetic flux in magnetic gap 111.

[0024] In the present embodiment, the voice coil body 120 includes a coil formed by winding a single metallic wire multiple times in an annular (cylindrical) shape, and a bobbin around which the coil is wound. The bobbin is a cylindrical member made of a material such as aluminum or resin, and has a front end coupled to the diaphragm 130 and a rear end disposed within the magnetic gap 111.

[0025] It should be noted that the voice coil body 120 of the speaker 100 is not limited to the above, and for example, a coil without a bobbin, such as that used in a micro speaker, may be used.

[0026] Diaphragm 130 is a member to which voice coil body 120 is connected, and generates sound by vibrating the air by being displaced in the front-rear direction (Z-axis direction in the drawing) based on the vibration of voice coil body 120 from a neutral position. In the case of this embodiment, the outer periphery of diaphragm 130 includes edge 131 having flexibility and restorability, cone-shaped connecting portion 132 having a hole into which voice coil body 120 is inserted and connecting edge 131 and voice coil body 120, and cap 133 that closes the hole of connecting portion 132.

[0027] The shape of the diaphragm 130 is not particularly limited, and examples of the shape include a cone, an elliptical cone, and a pyramid. It may also be a flat shape such as a disk, an elliptical plate, or a flat plate. The material constituting the diaphragm 130 is not particularly limited, and examples of the material include paper and resin. The diaphragm 130 may be an integrated member without being divided into a plurality of parts.

[0028] 4 is a perspective view showing the positional relationship of the magnetic circuit, transmission member, etc., with the housing omitted. Transmission member 150 is a member that extends along magnetic circuit 110 at a predetermined interval on the side of magnetic circuit 110 and transmits an electric signal input to voice coil body 120.

[0029] In this embodiment, the transmission member 150 is a thin plate-like metal member formed by punching a metal plate, and is bent in an L-shape from the side of the magnetic circuit 110 to the rear side. The long transmission member 150 is embedded inside the housing 140 so as to be integrated with the housing 140 by bending it in this manner, so that the attachment strength of the transmission member 150 to the housing 140 can be improved. The material for forming the transmission member 150 is not particularly limited as long as it can transmit an electric signal. In this embodiment, brass or phosphor bronze is used.

[0030] The two transmission members 150 are disposed at a positional relationship of 180 degrees around the winding axis of the voice coil body 120. With this arrangement, the two inner exposed portions 152 of the transmission member 150 are disposed symmetrically with respect to the winding axis of the voice coil body 120. Furthermore, the two connection members 170 electrically connecting the inner exposed portions 152 and the voice coil body 120 are disposed radially around the winding axis of the voice coil body 120. This makes it possible to suppress the rolling phenomenon caused by the connection members 170 when the voice coil body 120 reciprocates.

[0031] The outer exposed portion 151 of the transmission member 150 protrudes in a direction intersecting (orthogonal to) the bending direction of the main body of the transmission member 150, and the two outer exposed portions 151 are parallel to each other. The outer exposed portion 151 of the transmission member 150 functions as a male connection terminal to be connected to an external connector (not shown) or the like. The inner exposed portion 152 is narrower than the main body of the transmission member 150, and is inserted into the bifurcated portion at the tip of the connection member 170.

[0032] The housing 140 is a box-shaped member that holds the magnetic circuit 110 in a housed state, and is integrated with the magnetic circuit 110 and the transmission member 150. In the present embodiment, the overall shape of the housing 140 is a cylindrical shape with a bottom, and integrally includes a holding portion 141 that holds the magnetic circuit 110 and the transmission member 150 together, an intermediate portion 142 in which the damper 160 and the like are housed, and a frame portion 143 to which the diaphragm 130 and the cover 180 are attached. The housing 140 also integrally includes a protruding portion 144 that protrudes outward from the holding portion 141 along the transmission member 150. By forming the protruding portion 144 on the surface of the holding portion 141, the holding strength of the transmission member 150 is improved without increasing the thickness of the entire housing 140.

[0033] The housing 140 is also provided with a connector frame 145 that is disposed so as to surround the external exposed portion 151 of the transmission member 150 and that engages and holds an external connector (not shown) that is electrically connected to the external exposed portion 151. The connector frame 145 is a portion to which an external connector that connects the speaker 100 to an amplifier or the like is attached. The connector frame 145 can be electrically connected to the external exposed portion 151 that protrudes inward of the connector frame 145 by inserting a male connector provided at the tip of an output cable of the amplifier. This allows the connector frame 145 to absorb the force and suppress the force applied to the external exposed portion 151 when an electric wire connected to the external connector is pulled with a strong force, thereby preventing problems such as the transmission member 150 being displaced from the housing 140. The connector frame 145 may have a shape that functions as a male connector.

[0034] On the inside of intermediate portion 142 of housing 140, there are integrally provided an annular damper mounting portion 146 which protrudes forward from the front side of magnetic circuit 110 coaxially with the winding axis of voice coil body 120 and to which damper 160 is attached, and a diaphragm mounting portion 147 which is disposed concentrically outside damper mounting portion 146 and to which edge 131 of diaphragm 130 is attached. An inner exposed portion 152 of transmission member 150 is exposed between damper mounting portion 146 and diaphragm mounting portion 147.

[0035] The material constituting the housing 140 is not particularly limited, but in the present embodiment, the housing 140 is an insert-molded product of polycarbonate. The brittle temperature of polycarbonate is -100°C or lower, and the speaker 100 equipped with the housing 140 made of polycarbonate can have durability against large temperature changes. When molding the housing 140, the magnetic circuit 110 and the transmission member 150 are attached by insert molding. In addition, the housing 140 is integrally provided with a fixing portion 148 having a through hole for attachment to another structure.

[0036] 5 is a perspective view showing the damper, the voice coil body, and the transmission member. Damper 160 is a member that assists voice coil body 120 in linear motion in the front-rear direction (the Z-axis direction in the figure), and includes outer ring portion 161, inner ring portion 162, and arm portion 163.

[0037] Outer ring portion 161 is an annular portion that is attached to damper attachment portion 146 of housing 140. In the case of this embodiment, outer ring portion 161 has a rectangular cross section.

[0038] Inner ring portion 162 is an annular portion attached to the outer peripheral surface of voice coil body 120, and is arranged concentrically (coaxially) with outer ring portion 161. In the present embodiment, inner ring portion 162 has a rectangular cross section similar to that of outer ring portion 161. In the present embodiment, inner ring portion 162 is thinner in the radial direction than outer ring portion 161, and is also thinner in the front-rear direction (Z-axis direction in the figure) than outer ring portion 161.

[0039] The arm portion 163 is a member that extends in the radial direction around the winding axis of the voice coil body 120 and connects the outer ring portion 161 and the inner ring portion 162 arranged coaxially with the winding axis of the voice coil body 120 in a bridging manner. The damper 160 may have at least two arm portions 163, but in this embodiment, six arm portions 163 are provided. The arm portion 163 is ribbon-shaped with a thin thickness in the front-rear direction and a wide width in the radial direction, and is curved in a ripple shape around the winding axis of the voice coil body 120. This ensures a long stroke of the inner ring portion 162 that reciprocates together with the voice coil body 120 relative to the outer ring portion 161. In other words, the arm portion 163 has a peak portion 164 that bulges toward the front side and a valley portion 165 that is recessed toward the rear side, which are continuous in the radial direction. In this embodiment, the arm portion 163 has one peak portion 164 and one valley portion 165. When the curved state of one of the adjacent arm portions 163 on the outer ring portion 161 side is a peak portion 164, the curved state of the other outer ring portion 161 side is a valley portion 165, and the wave shape in the radial direction of the adjacent arm portions 163 is curved in an opposite phase. In addition, the circumferential width of the adjacent arm portions 163 is different. In the case of this embodiment, the damper 160 has four wide arm portions 163 and two narrow arm portions 163, and two sets of narrow arm portions 163 are arranged at an interval of 45 degrees between the two wide arm portions 163, and are arranged at an interval of 180 degrees. In the case of this embodiment, the width of one arm portion 163 is the same in the radial direction, but it does not matter if the arm portions 163 are fan-shaped or the like and have different widths in the radial direction.

[0040] The connecting member 170 is a member connected to the voice coil body 120 and transmits an electric signal input to the voice coil body 120, and extends in a radial direction with the winding axis of the voice coil body 120 as the center. The connecting member 170 is held by the damper 160 in a state in which it penetrates the outer ring portion 161 and the inner ring portion 162 between the arm portions 163. In the present embodiment, the connecting member 170 is ribbon-shaped with a thin thickness in the front-rear direction and a wide width in the radial direction, and has one peak portion and one valley portion like the arm portion 163, and is curved in an opposite phase to the wave shape in the radial direction of the adjacent arm portions 163. In addition, the connecting member 170 has different circumferential widths between the adjacent arm portions 163, and the width is close to the width of the narrow arm portion 163. In the present embodiment, the width of one connecting member 170 is the same in the radial direction, but the connecting member 170 may have a different width in the radial direction, such as a fan shape.

[0041] As described above, in the damper 160, the connecting members 170 and the arm portions 163 are arranged at 45 degree intervals in the radial direction around the winding axis of the voice coil body 120, and the narrower arm portions 163 and the connecting members 170 are arranged between the wider arm portions 163 arranged at 90 degree intervals. The adjacent arm portions 163 and the connecting members 170 are curved in a wave shape of opposite phases in the front-rear direction. The damper 160 is made of resin, and the outer ring portion 161, the inner ring portion 162, and the arm portions 163 are molded integrally. The connecting members 170 are insert molded when the damper 160 is molded integrally, and are integrated with the damper 160.

[0042] The material constituting the connection member 170 is not particularly limited as long as it can transmit an electric signal, but the connection member 170 exerts the same function as the arm portion 163 and exists as a part of the damper 160. Therefore, the connection member 170 is preferably an elastic member having flexibility and restorability, and in this embodiment, the same brass or phosphor bronze as the transmission member 150 is used. Note that the thickness of the connection member 170 is set to be thinner than that of the resin arm portion 163 in order to match the flexibility and restorability of the resin arm portion 163.

[0043] Cover 180 is disposed in front of diaphragm 130 to protect diaphragm 130 and improves the attachment strength of diaphragm 130 by sandwiching edge 131 together with diaphragm attachment portion 147 .

[0044] Next, a method for manufacturing speaker 100 will be described. Magnetic circuit 110 and transmission member 150 are placed in a mold, and polycarbonate constituting housing 140 is injected into the mold to perform insert molding to manufacture the intermediate part. This makes it possible to obtain in one step the intermediate part that is held in housing 140 in a predetermined positional relationship while ensuring insulation between magnetic circuit 110 and transmission member 150, and greatly simplifies the assembly process for speaker 100 as a whole.

[0045] The voice coil body 120 is inserted into the hole of the inner ring portion 162 of the damper 160 up to a predetermined position. The predetermined position is a position where an end of the connection member 170, which penetrates the inner ring portion 162 and protrudes to the front side (or rear side) of the inner ring portion 162, abuts against a terminal portion 121 provided on the outer circumferential surface of the voice coil body 120. The terminal portion 121 is electrically connected to an end of the coil of the voice coil body 120. The voice coil body 120 and the damper 160 are joined together with an adhesive or the like. The connection member 170 and the terminal portion 121 of the voice coil body 120 are electrically connected together with solder or the like.

[0046] Furthermore, a connection portion 132 of a diaphragm 130 is attached to the voice coil body 120 , and a cap 133 is attached to the connection portion 132 .

[0047] Next, outer ring portion 161 of damper 160 is attached to damper attachment portion 146 of housing 140, and voice coil body 120 is arranged in an inserted state in the magnetic gap of magnetic circuit 110. At this time, inner exposed portions 152 of transmission member 150 are inserted into the bifurcated portions at the tip of connecting member 170, thereby aligning damper 160 and voice coil body 120 with respect to the housing.

[0048] Next, the connection member 170 and the inner exposed portion 152 of the transmission member 150 are electrically connected by solder or the like. Next, the edge 131 is attached to the connection portion 132 and the diaphragm attachment portion 147 by adhesive or the like. Finally, the cover 180 is inserted into the frame portion 143 of the housing 140, and is attached to the housing 140 so as to press down the periphery of the edge 131. With the above steps, the speaker 100 is assembled.

[0049] According to the above speaker 100, because the magnetic circuit 110 and the transmission member 150 extending at least laterally of the magnetic circuit 110 are integrated with the housing 140, even if a strong force is applied to the externally exposed portion 151 of the transmission member 150, it is possible to prevent the position of the transmission member 150 relative to the housing 140 from shifting or the transmission member 150 from falling off the housing 140. Furthermore, because the housing 140, the transmission member 150, and the magnetic circuit 110 are not assembled by an operator, the precision of the relative positions of each can be stabilized, and the process of assembling the speaker 100 can be simplified.

[0050] In addition, since the diameter of the outer peripheral surface of magnet 112 is shorter than the diameter of the outermost surfaces of front plate 113 and rear member 114, resin is filled between front plate 113 and rear member 114, and the anchor effect enables magnetic circuit 110 to be firmly fixed to housing 140.

[0051] In addition, since the transmission members 150 are disposed symmetrically at 180 degrees from each other, the resin can be made to flow evenly into the vicinity of the transmission members 150 during insert molding, making it possible to mitigate thermal shock and the like.

[0052] The present invention is not limited to the above-described embodiment. For example, the components described in this specification may be combined in any manner, or some of the components may be removed to create another embodiment of the present invention. In addition, the present invention also includes modifications that are made to the above-described embodiment by those skilled in the art without departing from the spirit of the present invention, i.e., the meaning of the words in the claims.

[0053] For example, arm portion 163 of damper 160 has been described as being made of resin and integrated with outer ring portion 161 and inner ring portion 162, except for integrated connecting member 170, but at least two of arm portion 163 may be made of metal similar to connecting member 170. In this case, arm portion 163 made of metal other than connecting member 170 is not electrically connected to voice coil body 120, and functions as a dummy for connecting member 170.

[0054] Furthermore, the type of magnetic circuit 110 provided in speaker 100 is not particularly limited, and an internal magnet type magnetic circuit 110 may be adopted.

[0055] Moreover, the speaker 100 may be made damperless in order to lower the minimum resonance frequency and improve the sound quality. The damper 160 may be attached to the diaphragm 130 instead of the voice coil body 120. [Industrial Applicability]

[0056] The present disclosure can be used in a speaker having a resin housing with a magnetic circuit integrally molded therewith. [Explanation of symbols]

[0057] 100 speakers 110 Magnetic Circuit 111 Magnetic Gap 112 Magnet 113 Front plate 114 Rear member 115 Center Pole 116 Positioning section 117 Tapered section 120 Voice coil body 121 Terminal section 130 Diaphragm 131 Edge 132 Connection 133 Cap 140 Case 141 Holding part 142 Middle section 143 Frame section 144 Protrusion 145 Connector Frame 146 Damper mounting part 147 Diaphragm mounting part 148 Fixed part 150 Transmission parts 151 Externally exposed parts 152 Internal exposed part 160 Damper 161 Outer ring 162 Inner ring 163 Arm section 164 Yamabe 165 Valley 170 Connection parts 180 Cover

Claims

1. a magnetic circuit having a magnetic gap; a voice coil body inserted into the magnetic gap; a diaphragm attached to the voice coil body; a transmission member disposed along the side of the magnetic circuit at a predetermined interval, the transmission member transmitting an electric signal input to the voice coil body; a resin housing integrated with the magnetic circuit and the transmission member, The transmission member is The magnetic circuit is disposed in a housing, the magnetic circuit being embedded in the housing and including a portion that is bent in an L-shape from the side to the rear side, An outer exposed portion exposed to an outer side of the housing, and an inner exposed portion exposed to an inner side of the housing, the exposed portion of the transmission member is a connection terminal to be connected to an external connector, and is provided on the rear side of the magnetic circuit; The housing includes: a connector frame for holding the external connector is provided integrally on the rear side of the magnetic circuit, The inner exposed portion is narrower than the main body of the transmission member, and is inserted into a bifurcated portion at the tip of a connecting member that connects the voice coil body and the transmission member. speaker.

2. The transmission member is a plate-shaped metal.

2. The loudspeaker of claim 1.

3. The two transmission members are disposed at a positional relationship of 180 degrees around the winding axis of the voice coil body.

3. A speaker according to claim 1 or 2.

4. The magnetic circuit includes: a ring-shaped magnet arranged coaxially with a winding axis of the voice coil body; A rear member disposed on a rear side of the magnet; a front plate having an annular shape and arranged coaxially with the winding shaft on a front side of the magnet; The outer diameter of the magnet is smaller than the outer diameter of the front plate. A loudspeaker according to any one of claims 1 to 3.

5. The magnetic circuit includes: a ring-shaped magnet arranged coaxially with a winding axis of the voice coil body; A rear member disposed on a rear side of the magnet; a front plate having an annular shape and arranged coaxially with the winding shaft on a front side of the magnet; The rear member is a position determining portion that is inserted into the magnet and determines the position of the magnet; a tapered portion that decreases in diameter from the position determining portion toward the front, A loudspeaker according to any one of claims 1 to 4.

6. The housing includes: a ring-shaped damper attachment portion that is coaxial with a winding axis of the voice coil body, protruding forward from a front side of the magnetic circuit, and to which a damper is attached; a diaphragm attachment portion disposed concentrically outside the damper attachment portion and to which the diaphragm is attached, The speaker according to claim 1 , wherein the inner exposed portion of the transmission member is exposed between the damper attachment portion and the diaphragm attachment portion.

7. The housing is made of polycarbonate. A loudspeaker according to any one of claims 1 to 6.

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