JP2023108558A - speaker device - Google Patents

Abstract

A top plate is attached to a base member made of resin without being deformed. A magnetic circuit (110) having a bottom plate (111), a magnet (112), and a top plate (113); a voice coil body (120) arranged with one end inserted into a magnetic gap (119); A vibration plate 130 connected to an end portion, and a base member 140 holding the magnetic circuit 110 and the vibration plate 130 are provided. a holding portion 142 covering one end of the cylindrical portion 141 and in contact with the top plate; A speaker device 100 comprising: [Selection drawing] Fig. 4

Description

The present invention relates to a speaker device that converts an electrical signal into sound.

Conventionally, when a magnetic circuit is fixed to a base member called a frame or the like, as in the speaker devices described in Patent Documents 1 and 2, a portion of the top plate of the magnetic circuit is bent to form a hole in the base member. After the top plate is inserted into the top plate, the tip of the inserted top plate is pressed by a press machine or the like to be bent and mechanically joined by so-called caulking.

JP-A-7-222281 WO2013/190824

However, when a portion of the top plate made of metal is pressurized and crimped, the surface of the top plate may rub against a jig or the like to generate metal powder. This metal powder may get into the magnetic gap of the speaker and cause abnormal noise when the voice coil body is driven. In addition, since a portion of the top plate is bent, the necessary flat portion of the top plate is distorted, and it may be difficult to ensure the accuracy of the speaker device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker device capable of fixing a magnetic circuit to a base member without caulking the top plate.

In order to achieve the above object, one aspect of the present invention provides a speaker device comprising a magnetic circuit having a bottom plate, a magnet, and a top plate, and a magnetic gap between the bottom plate and the top plate. a voice coil body having one end inserted therein; a diaphragm connected to the other end of the voice coil body; and a foundation member holding the magnetic circuit and the diaphragm, The members include a resin cylinder surrounding the magnetic circuit, a holding part covering one end of the cylinder and in contact with the top plate, and the holding part protruding inward from the inner peripheral surface of the cylinder. and a plurality of engaging protrusions sandwiching the peripheral edge of the top plate between.

According to the present invention, when the top plate is inserted toward the holding portion and passes over the engaging projection provided on the tubular portion, the entire annular resin tubular portion is bent, thereby allowing the top plate to pass through. be. As a result, the top plate can be held between the holding portion and the engaging projections without generating metal powder. In addition, it is possible to prevent deterioration of the holding force of the top plate, such as stress concentration on a portion of the cylindrical portion and the cylindrical portion being damaged.

1 is a front perspective view showing the appearance of a speaker device according to an embodiment; FIG. 2 is a perspective view showing the appearance of the speaker device according to the present embodiment from the back side; FIG. 2 is a perspective view showing the appearance of the speaker device according to the present embodiment from the back side, omitting the bottom plate and magnets; FIG. FIG. 3 is a cross-sectional view of a part of the speaker device according to the present embodiment, cut along a line passing through the engaging projection; 2 is a cross-sectional view of a part of the speaker device according to the present embodiment cut along a line passing through the pressing portion; FIG. It is a perspective view showing a top plate. FIG. 10 is a perspective view showing a positioning rib provided inside the holding portion from the back side; It is a perspective view which shows the press part provided inside the cylinder part from the back side. FIG. 4 is a cross-sectional view showing the first step in attaching the top plate to the base member; FIG. 11 is a cross-sectional view showing a second step in attaching the top plate to the base member; FIG. 11 is a cross-sectional view showing the third stage of attaching the top plate to the base member; FIG. 4 is a cross-sectional view showing a state where the top plate is attached to the base member; It is a top view which shows the state which inserted the magnet in the cylinder part from the back side.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a speaker device according to the present invention will be described with reference to the drawings. It should be noted that the following embodiments are examples for explaining 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, contents of each step in the method, order of each step, etc. shown in the following embodiments are examples, and are described below. may include content not listed in In addition, geometric expressions such as parallel and orthogonal are sometimes used, but these expressions do not indicate mathematical rigor, and substantially allowable errors, deviations, and the like are included. Expressions such as "simultaneous" and "identical" also include substantially permissible ranges.

In addition, the drawings are schematic diagrams that have been appropriately emphasized, omitted, or adjusted in proportion in order to explain the present invention, and are different from the actual shape, positional relationship, and proportion.

Further, in some cases, a plurality of inventions will be collectively described as one embodiment below. Also, some of the contents described below are described as optional components related to the present invention.

FIG. 1 is a front perspective view showing the appearance of a speaker device according to the present embodiment. FIG. 2 is a perspective view showing the appearance of the speaker device according to this embodiment from the back side. FIG. 3 is a perspective view showing the appearance of the speaker device according to the present embodiment from the back side, omitting the bottom plate and magnets. FIG. 4 is a cross-sectional view showing part of the speaker device according to this embodiment. FIG. 5 is a cross-sectional view of a part of the speaker device according to the present embodiment cut along a line passing through the pressing portion. As shown in these figures, the speaker device 100 is an electroacoustic transducer that converts an electrical signal into sound, and includes a magnetic circuit 110, a voice coil body 120, a diaphragm 130, and a base member 140. I have.

The magnetic circuit 110 is a circuit that generates a stationary magnetic field in the magnetic gap 119 (see FIG. 4). The magnetic circuit 110 may be of either the inner magnetic type or the outer magnetic type. A bottom plate 111 integrally provided in an upright shape, an annular magnet 112 disposed so as to surround a bar-shaped portion 114 of the bottom plate 111, and an end face of the bottom plate 111 opposite to the bottom plate 115 of the magnet 112 is attached. , and a disk-shaped top plate 113 forming a magnetic gap 119 with the outer peripheral surface of the bar-shaped portion 114 of the bottom plate 111 .

The shape of the magnet 112 is not particularly limited, but in the case of this embodiment, it has a ring shape with a rectangular cross section. The material of the magnet 112 is not particularly limited, but in the case of this embodiment, a ferrite magnet is adopted.

FIG. 6 is a perspective view showing a top plate. In the case of this embodiment, the top plate 113 has a plurality of projecting portions 116 projecting radially outward along the surface of the top plate 113 (the XY plane in the figure) on its peripheral edge. The projecting portion 116 is a portion that engages with the base member 140, and is provided with a first tapered portion 117 on the front side (the Z+ side in the drawing). The number of protrusions 116 is not particularly limited, but preferably a plurality of protrusions 116 are provided. In this embodiment, top plate 113 includes four protrusions 116 . At least one set of protrusions 116 is arranged on a straight line passing through the center of top plate 113 on the surface of top plate 113 . In the case of this embodiment, two sets of protruding portions 116 are arranged side by side on straight lines that are perpendicular to each other.

The top plate 113 has an annular protrusion 118 protruding from the surface of the top plate 113 surrounding the bar-shaped portion 114 of the bottom plate 111 to form a magnetic gap 119 on its inner periphery. Further, the main body portion 103 other than the projecting portion 116 of the top plate 113 is arranged inside the magnet 112 in the direction perpendicular to the tube axis of the cylindrical portion 141 . In the case of this embodiment, the body portion 103 is disc-shaped and has a smaller diameter than the diameter of the outer peripheral surface of the annular magnet.

The voice coil body 120 is a component arranged with one end inserted into the magnetic gap 119 between the bottom plate 111 and the top plate 113 . The voice coil body 120 includes a voice coil 121 that generates a magnetic field according to an input signal, and a cylindrical bobbin 122 around which the voice coil 121 is wound. A diaphragm 130 is attached to the outer circumference of the tip of the bobbin 122 of the voice coil body 120 , and the voice coil 121 is arranged at the base of the bobbin 122 . A cap 123 is attached to the tip of the bobbin 122 to close the opening of the bobbin 122 . Voice coil 121 is arranged in a state in which voice coil 121 is inserted into annular magnetic gap 119 formed by magnetic circuit 110 .

In the case of this embodiment, a damper 160 is attached to the outer peripheral surface of the intermediate portion of the voice coil body 120 in the front-rear direction (the Z-axis direction in the drawing). The damper 160 is a member that connects the base member 140 and the voice coil body 120 and supports the reciprocating motion of the voice coil body 120 in the tube axis direction. In the present embodiment, the damper 160 is a thin ring-shaped member curved in a ripple shape, the inner periphery of which is attached to the intermediate portion of the voice coil body 120 and the outer periphery of which is attached to the base member 140 . Note that the speaker device 100 may not include the damper 160 in some cases.

Diaphragm 130 is a member that is connected to the other end of voice coil body 120 and vibrates by reciprocating motion of voice coil body 120 in the direction of the winding axis to generate sound. The shape (structure) of diaphragm 130 is not particularly limited, but in the case of the present embodiment, diaphragm 130 has a truncated cone shape (a cone shape with the top portion cut off).

In addition, the diaphragm 130 has an edge 131 protruding in an annular shape on its outer periphery. A through hole is provided in the center of diaphragm 130, and voice coil body 120 is attached to the outer peripheral surface of bobbin 122 by adhesion in a state where voice coil body 120 is pierced. The entire circumference of the outer periphery of diaphragm 130 is attached to the front end of base member 140 via edge 131 by adhesion.

The base member 140 is a member called a so-called frame that serves as a structural base of the speaker device 100 and holds at least the magnetic circuit 110 and the diaphragm 130 . The base member 140 includes a tubular portion 141 , a holding portion 142 , an engaging protrusion 143 and a pressing portion 152 . In the case of this embodiment, the base member 140 includes an outer cylindrical portion 144 to which the outer peripheral portion of the diaphragm 130 is attached, an inner cylindrical portion 145 to which the outer peripheral portion of the damper 160 is attached, the outer cylindrical portion 144 and the inner cylindrical portion 145. and a beam 146 that bridges and connects the Although the material of the base member 140 is not particularly limited, in the case of the present embodiment, the entire base member 140 is integrally formed of resin.

Although the resin constituting the base member 140 is not particularly limited, for example, polypropylene is used as the matrix resin, and about 10% to 30% glass fiber and 30% to 15% mica are mixed as reinforcing materials. can be exemplified. Further, polycarbonate, ABS (Acrylonitrile Butadiene Styrene) resin, etc., which do not use a reinforcing agent, can also be exemplified.

The tubular portion 141 is an annular portion that surrounds at least a portion of the magnetic circuit 110 and is centered on the tube axis (the Z-axis direction in the drawing) that coincides with the winding axis of the voice coil body 120 . In the case of this embodiment, the cylindrical portion 141 has a circumferentially continuous cylindrical shape as seen from the general view, and partially extends in the circumferential direction in the direction of the pipe axis so that the protruding portion 116 of the top plate 113 is aligned with the pipe axis. It has a groove portion 147 that accommodates it in a fitted state so as to be slidable in the direction. The tubular portion 141 has groove portions 147 in number corresponding to the protrusions 116 . In the case of this embodiment, the cylindrical portion 141 has four groove portions 147 . At least one pair of the grooves 147 are arranged on the surface of the holding portion 142 so as to face each other on a straight line passing through the center of the holding portion 142 . In the case of this embodiment, two sets of grooves 147 are arranged side by side on orthogonal straight lines. By fitting the projecting portion 116 of the top plate 113 into the groove portion 147, the movement (rotation) of the top plate 113 in the circumferential direction can be restricted.

The holding portion 142 is a portion that covers one end of the cylindrical portion 141 and contacts the top plate 113 . In the case of this embodiment, the holding portion 142 is a plate-like portion extending over the surface of the top plate 113, and has a through hole 148 in the center thereof into which the voice coil body 120 is inserted. Further, the annular projecting portion 118 of the top plate 113 and the bar-shaped portion 114 of the bottom plate 111 are inserted into the through hole 148 to form a magnetic gap 119 . The holding portion 142 does not have any through hole other than the through hole 148 , and closes the open end on the front side of the cylindrical portion 141 except for the through hole 148 . The rear open end of the through hole 148 is closed by the magnet 112 of the magnetic circuit 110 and the bottom plate 111 . With this structure, even if foreign matter such as water droplets hits the speaker device 100 from behind, it is possible to prevent the foreign matter from directly entering the magnetic gap 119, thereby preventing deterioration in sound quality due to the foreign matter entering the magnetic gap 119. .

The holding portion 142 closes the rear open end of the inner cylindrical portion 145 except for the through hole 148 . A damper 160 closes the front opening of the inner cylindrical portion 145 from the voice coil body 120 to the outer peripheral edge. It should be noted that the damper 160 can allow air to pass through. Furthermore, the front side opening of voice coil body 120 is closed with cap 123 . As described above, the magnetic gap 119 is covered with the bottom plate 111 , the magnet 112 , the holding portion 142 , the inner cylindrical portion 145 , the damper 160 , the voice coil body 120 and the cap 123 . This prevents foreign matter from entering the magnetic gap 119 .

The holding portion 142 is recessed in a direction away from the engaging projection 143 (Z+ direction in the figure) in the axial direction of the cylindrical portion 141 and has a concave portion 149 that does not contact the top plate 113 . The recess 149 is a groove with a depth of 1 mm or less radially extending from the front of the engaging projection 143 to the through hole 148 , and is provided at a position corresponding to the engaging projection 143 . The concave portion 149 prevents surface contact between the holding portion 142 and the top plate 113 from being hindered by burrs that may occur due to the presence of the slide core used to form the undercut portion of the engaging projection 143 . can be avoided.

Further, the holding portion 142 has an annular wall portion 104 in which the body portion 103 of the top plate 113 is fitted. An alignment rib 151 (see FIG. 7) is provided on the inner peripheral surface of the wall portion 104 so as to protrude inward and contact the peripheral surface of the top plate 113 to align the top plate 113 . The number of ribs 151 is not particularly limited, but in the case of the present embodiment, ribs 151 are provided at four locations. At least one set of ribs 151 is arranged on the surface of holding portion 142 so as to face each other on a straight line passing through the center of holding portion 142 . Two sets of ribs 151 are arranged side by side on orthogonal straight lines. By fitting the outer peripheral surface of the body portion 103 of the top plate 113 along the plurality of ribs 151 arranged on the circumference, it is possible to prevent the top plate 113 from moving in the radial direction while reducing friction generated during fitting. can be regulated.

As shown in FIG. 3 , the engagement projection 143 is a claw-like portion that protrudes inward from the inner peripheral surface of the cylindrical portion 141 and sandwiches the peripheral portion of the top plate 113 with the holding portion 142 . Engagement projections 143 are provided on the inner peripheral surface of cylindrical portion 141 in a number corresponding to projections 116 . In the case of this embodiment, the cylindrical portion 141 has four engaging protrusions 143 . At least one pair of the engaging projections 143 are arranged on the surface of the holding portion 142 so as to face each other on a straight line passing through the center of the holding portion 142 . In the case of this embodiment, two sets of engaging protrusions 143 are arranged side by side on straight lines that intersect each other. Also, the engaging projection 143 is provided on the bottom surface of the groove portion 147 .

The shape of the engaging projection 143 is not particularly limited, but in the case of the present embodiment, it has a substantially rectangular parallelepiped shape extending along the inner peripheral surface of the cylindrical portion 141, and extends toward the rear side (the Z-side in the drawing). ) has a second tapered portion 150 . The front side (Z+ side in the drawing) of the engaging projection 143 is a flat surface that makes surface contact with the surface of the top plate 113 . Due to the above shape, when the top plate 113 is attached to the inside of the cylindrical portion 141, it can easily pass over the engaging projection 143, and when the top plate 113 is sandwiched between the engaging projection 143 and the holding portion 142, The top plate 113 can be firmly held.

As shown in FIG. 3, the pressing portion 152 is a portion that surrounds the magnet 112 at a predetermined interval and presses the peripheral surface of the magnet 112 in the tube axis direction of the magnet 112 to align the magnet 112. are provided. In the case of this embodiment, the pressing portions 152 are arranged at four central positions of the engaging protrusions 143 adjacent in the circumferential direction. At least one set of the pressing portions 152 is arranged on a straight line passing through the tube axis of the magnet 112 so as to face the magnet 112 and press the magnet 112 toward the tube axis. In the case of the present embodiment, two sets of pressing portions 152 are arranged side by side on straight lines that intersect each other.

In the case of this embodiment, as shown in FIG. 8, the pressing portion 152 includes a protruding piece portion 153, a contact portion 154, and a connecting portion 155, and is arranged inside the cylindrical portion 141. . In the vicinity of the pressing portion 152, the cylindrical portion 141 has a bulging portion 156 that bulges outward in a groove shape, and a part of the pressing portion 152 is accommodated inside the bulging portion 156. It is

The projecting piece 153 is a rectangular piece projecting rearward from the holding portion 142 along the magnet 112 , and is arranged substantially parallel to the bottom of the bulging portion 156 of the cylindrical portion 141 . The projection length of the projecting piece 153 from the holding portion 142 is substantially the same as the projection length of the cylindrical portion 141 from the holding portion 142 .

The contact portion 154 is a portion that protrudes from the inner surface of the protruding piece portion 153 toward the peripheral surface of the magnet 112 to a position that contacts the magnet 112 . The shape of the contact portion 154 is not limited, but can be exemplified by a conical shape or a dome shape.

The connecting portion 155 is a portion that connects the bottom of the bulging portion 156 of the cylindrical portion 141 and the projecting piece portion 153 . The shape of the connecting portion 155 is not particularly limited, but in the case of the present embodiment, it is a rib shape narrower than the projecting piece portion 153 in the circumferential direction, and extends from the holding portion 142 to the tip of the projecting piece portion 153 . , and connects the cylindrical portion 141 and the projecting piece portion 153 .

Next, the state of attaching the top plate 113 to the base member 140 will be described. As shown in FIG. 9, the projecting portions 116 of the top plate 113 are inserted into the groove portions 147 of the cylindrical portion 141 from behind. Next, the top plate 113 is slid forward of the cylindrical portion 141 while the protrusion 116 is aligned with the groove 147 . As shown in FIG. 10, when the first tapered portion 117 at the tip of the projection 116 and the second tapered portion 150 of the engaging projection 143 are in contact with each other, further force is applied to each engaging projection 143 so that the projecting portion A force is generated in a direction away from 116, and each portion of cylindrical portion 141 provided with engaging projection 143 as shown in FIG. 11 tilts outward due to the flexibility of the resin. Note that FIG. 11 emphasizes the inclination. The cylindrical portion 141 has a circular ring shape without a break in the circumferential direction, and the plurality of adjacent engaging projections 143 are connected without a break by the cylindrical portion 141, so that an outward force is applied to the engaging projections 143. The entire tubular portion 141 is deformed against (forces in four directions in the case of the present embodiment), and stress concentration can be alleviated. As a result, even if the thickness of the cylindrical portion 141 is formed relatively thin, it is possible to prevent a portion of the cylindrical portion 141 from being damaged due to concentration of stress.

Further, when the top plate 113 is further pushed into the base member 140, as shown in FIG. The engagement protrusion 143 returns to its original position due to the restoring force of the resin forming the 140 and the structural restoring force of the continuous ring-shaped tubular portion 141 . The engaging projections 143 sandwich the projecting portion 116 on the peripheral edge of the top plate 113 with the holding portion 142 in the front-rear direction (the Z-axis direction in the drawing) to fix the top plate 113 to the base member 140 .

As described above, according to the speaker device 100 of the present embodiment, the top plate 113 made of metal can be attached to the base member 140 without strongly rubbing against a metal tool such as a jig. Therefore, no metal powder is generated at the time of mounting, and problems such as abnormal noise caused by metal powder entering the magnetic gap 119 and deterioration of sound quality can be avoided.

Moreover, since there is no need to deform the top plate 113 by caulking or the like, the dimensional accuracy can be lowered, and the manufacturing cost can be reduced.

In addition, the engaging protrusion 143 is pressed against the peripheral edge of the top plate 113 to fix the top plate 113 to the holding portion 142 in a state of surface contact. The pressing force acting on the top plate 113 is generated not only by the elastic force of the portion of the cylindrical portion 141 where the engaging projection 143 is provided, but also by the structure of the cylindrical portion 141 as a whole. As a result, even if the cylindrical portion 141 is designed to be relatively thin, it is possible to sufficiently secure the fixing force of the top plate 113 . Therefore, it is possible to contribute to weight reduction while maintaining the structural strength of the speaker device 100 .

Next, the state when attaching the magnet 112 after attaching the top plate 113 to the base member 140 will be described. An adhesive is applied to at least one of the surface of the top plate 113 attached to the base member 140 and the surface of the magnet 112 in contact with the top plate 113 .

Next, the magnet 112 is inserted inside the tubular portion 141 . The circumferential surface of the inserted magnet 112 comes into contact with the contact portion 154 of the pressing portion 152, and as shown in FIG. A state in which the axis and the tube axis of the magnet 112 are aligned is brought about. In the case of the present embodiment, the force applied from the pressing portion 152 is the elastic force of the protruding piece portion 153 of the pressing portion 152 made of resin and the elastic force of the cylindrical portion 141 made of resin continuously connected in the circumferential direction. It is the force transmitted through connection 155 . As a result, a uniform and strong force is applied to the magnet 112 in the circumferential direction, and the position of the magnet 112 is stabilized. Here, since the magnet 112 has a large dimensional tolerance, the pressing portion 152 is arranged at a position where it can sufficiently press the magnet 112 even when the magnet 112 having the smallest possible diameter is inserted. When the magnet 112 having the largest diameter assumed in this arrangement is inserted, the protruding piece 153 and the bulging portion 156 of the cylindrical portion 141 are largely warped outward. The distortion of the bulging portion 156 caused by this is alleviated by the deformation of the entire cylindrical portion 141 because the cylindrical portion 141 is continuously connected in the circumferential direction. preventing it from occurring.

Next, when the magnet 112 comes into contact with the top plate 113 via the adhesive, the adhesive protrudes from the inner and outer peripheral edges of the magnet 112 due to the weight of the magnet 112 and the pressing force from the outside. Moreover, since the position of the magnet 112 is determined with high accuracy by the plurality of pressing portions 152, the distance between the inner peripheral edge of the magnet 112 and the magnetic gap 119 is uniform in the circumferential direction. As a result, it is possible to prevent the protruding adhesive from reaching the magnetic gap 119 because the magnetic gap 119 and a part of the inner peripheral edge of the magnet 112 are too close to each other. In addition, the inner diameter of the ring-shaped magnet 112 can be shortened, the efficiency of the magnet 112 can be improved, and a high magnetic force can be secured.

In addition, particles that may be generated due to chipping of the inner peripheral edge of the magnet 112 can be collected by the protruded adhesive, and the particles of the magnet can be prevented from entering the magnetic gap 119.例文帳に追加

Next, the speaker device 100 is transported to the next process. The position of the magnet 112 with respect to the top plate 113 is maintained by the force applied from the pressing portion 152 against the inertia generated during transportation, and the magnet 112 does not shift. This eliminates the time required for attaching a jig or the like for maintaining the position of the magnet 112 with respect to the top plate 113, and the magnet 112 can be transported before the adhesive hardens and the magnet 112 is fixed. can improve the manufacturing efficiency of Moreover, since a fixing jig or the like becomes unnecessary, the manufacturing cost can be reduced.

It should be noted that the present invention is not limited to the above embodiments. For example, another embodiment realized by arbitrarily combining the constituent elements described in this specification or omitting some of the constituent elements may be an embodiment of the present invention. The present invention also includes modifications obtained by making various modifications to the above-described embodiment within the scope of the gist of the present invention, that is, the meaning of the words described in the claims, which a person skilled in the art can think of. be

For example, the base member 140 may be configured such that the cylindrical portion 141 is made of resin and the other portions are made of other materials such as metal.

In addition, in the description of the assembly of the speaker device 100, the case of moving the top plate 113 with respect to the base member 140 was described, but any movement may be performed as long as the distance between the top plate 113 and the holding portion 142 is reduced. do not have. This is the same when inserting the magnet 112 into the tubular portion 141 .

A part of the cylindrical portion 141 may function as the projecting piece portion 153 and the contact portion 154 may be provided on the inner peripheral surface of the cylindrical portion 141 .

Alternatively, after attaching the bottom plate 111 to the magnet 112 , the magnet 112 and the bottom plate 111 may be inserted into the cylindrical portion 141 and attached to the top plate 113 .

Moreover, the speaker device 100 may be a so-called coaxial speaker device 100 having a second speaker device in charge of reproducing high-pitched sounds in front of the diaphragm 130 .

Further, the speaker device 100 may be provided with a cabinet or may be attached to a bottom plate, a housing of an electronic device such as a television or a computer, or a structure of a moving body such as a car or an aircraft. Also, the speaker device 100 may be attached to a housing that constitutes headphones or an inner phone.

INDUSTRIAL APPLICABILITY The present invention can be applied to a speaker device that reproduces an audio signal such as music as sound.

100 speaker device 103 main body 104 wall 110 magnetic circuit 111 bottom plate 112 magnet 113 top plate 114 rod-shaped portion 115 bottom plate 116 protrusion 117 first taper portion 118 annular protrusion 119 magnetic gap 120 voice coil body 121 voice coil 122 bobbin 123 Cap 130 Diaphragm 131 Edge 140 Base member 141 Cylindrical portion 142 Holding portion 143 Engagement protrusion 144 Outer cylindrical portion 145 Inner cylindrical portion 146 Beam 147 Groove 148 Through hole 149 Recess 150 Second tapered portion 151 Rib 152 Pressing portion 153 Protruding piece 154 contact portion 155 connection portion 156 swelling portion 160 damper

Claims (8)

a magnetic circuit having a bottom plate, a magnet, and a top plate;
a voice coil body having one end inserted into a magnetic gap between the bottom plate and the top plate;
a diaphragm connected to the other end of the voice coil body;
a base member that holds the magnetic circuit and the diaphragm,
The base member is
a resin cylinder surrounding the magnetic circuit;
a holding portion that covers one end of the cylindrical portion and abuts on the top plate;
and a plurality of engaging projections projecting inwardly from an inner peripheral surface of the tubular portion and sandwiching the peripheral edge portion of the top plate with the holding portion. The top plate is
A plurality of protrusions protruding along the surface of the top plate are provided on the peripheral edge,
The cylindrical portion is
A plurality of grooves extending in the tube axis direction and slidably accommodating the protrusions,
2. The speaker device according to claim 1, wherein the engaging projection is provided on the bottom surface of the groove. 3. The speaker device according to claim 2, wherein the body portion of the top plate other than the projecting portion is arranged inside the magnet in a direction perpendicular to the tube axis of the cylindrical portion. 4. The speaker device according to any one of claims 1 to 3, wherein at least one pair of said engaging projections are arranged in a facing manner. The holding part is
5. The speaker device according to any one of claims 1 to 4, wherein there is no penetrating hole between the through hole through which the voice coil body is inserted and the cylindrical portion. The base member is
6. The speaker device according to any one of claims 1 to 5, further comprising a plurality of alignment ribs that contact the peripheral surface of the top plate and align the top plate. The holding part is
7. The speaker device according to any one of claims 1 to 6, further comprising a concave portion which is recessed in a direction away from the engaging projection in the pipe axis direction of the cylindrical portion and which does not contact the top plate. The speaker device according to any one of claims 1 to 7, wherein the tubular portion has an annular shape that is continuous in the circumferential direction.

Images