JP7398730B2 - speaker device - Google Patents

Description

The present disclosure relates to a speaker device including two diaphragms.

Conventionally, a speaker device, such as the speaker device described in Patent Document 1, has a speaker device in which a plurality of speaker units each including an elongated flat diaphragm, a voice coil, and a magnetic circuit are arranged in the longitudinal direction of the diaphragm and attached to a single frame. exists.

Japanese Patent Application Publication No. 2012-199859

However, when wiring signal lines that input electrical signals to multiple speaker units, wiring is required for each of the multiple speaker units, making the wiring extremely complex and reducing productivity. Was. Further, when wiring using a printed circuit board or the like, the printed circuit board is required, which poses a problem of increasing costs. Furthermore, if you try to simplify the wiring by consolidating the input terminals in one place, it is necessary to reverse the magnetization directions of the magnetic circuits or reverse the winding directions of the voice coils. In such a case, there is a problem that the number of types of parts constituting the speaker device increases and the manufacturing process becomes complicated.

An object of the present disclosure is to provide a speaker device that includes two speaker units and that allows easy wiring of signal lines.

In order to achieve the above object, a speaker device according to the present invention includes two magnetic circuits that are arranged side by side and have a shorter length in the width direction perpendicular to the arrangement direction, and two voice coil bodies whose length in the width direction is shorter than the length in the alignment direction corresponding to the shape of the circuit, and the width relative to the length in the alignment direction that is coupled to the two voice coil bodies, respectively It is equipped with two diaphragms having a short length in the direction and a frame to which the two diaphragms are attached, and the two coils each of the voice coil bodies have are connected in series, and the two coils are connected in series between the two voice coil bodies. It is connected to a set of input terminals for inputting electrical signals provided in the.

Even if the speaker device according to the present disclosure is equipped with two voice coil bodies, a set of input terminals for inputting electrical signals such as audio signals can be provided together in the center of the speaker device. , wiring of signal lines can be facilitated, and wiring with the outside can also be facilitated.

FIG. 1 is a perspective view showing a speaker device according to an embodiment. FIG. 2 is a perspective view showing the inside of the speaker device according to the embodiment, with the diaphragm omitted. FIG. 3 is a cross-sectional view of the speaker device according to the embodiment taken along the line II shown in FIG. FIG. 4 is a perspective view showing the speaker according to the embodiment from the back side. FIG. 5 is a perspective view showing a magnetic circuit and a voice coil body. FIG. 6 is a plan view showing a magnetic circuit and a voice coil body. FIG. 7 is a perspective view schematically showing two coils, a connecting member, a positive input terminal, and a negative input terminal. FIG. 8 is a perspective view showing the symmetry of the speaker device according to the embodiment. FIG. 9 is a sectional view taken along the line II-II shown in FIG. 4. FIG. 10 is a perspective view showing the frame and the jig before attachment. FIG. 11 is a perspective view showing a state in which the jig is attached to the frame. FIG. 12 is a perspective view showing a voice coil body attached to a jig attached to a frame.

Embodiments of the speaker device will be described below with reference to the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are examples, and do not limit the present disclosure. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the most significant concept will be described as arbitrary constituent elements.

Furthermore, the drawings are schematic diagrams with appropriate emphasis, omission, and ratio adjustment in order to illustrate the present disclosure, and may differ from the actual shapes, positional relationships, and ratios.

A speaker device according to an aspect of the present disclosure includes a frame, an oval diaphragm attached to the frame, a voice coil body having a shape corresponding to the shape of the diaphragm, and into which the voice coil body can be inserted. a magnetic circuit having a magnetic gap having a shape of A plurality of second engaging portions are provided that engage with the first engaging portion to determine the position of the magnetic circuit.

According to the speaker device, by engaging the first engaging portion and the second engaging portion, it is possible to provide a speaker device in which the positional relationship between the magnetic circuit and the diaphragm is stable via the frame.

A method of manufacturing a speaker device according to another aspect of the present disclosure includes a frame, an oval diaphragm attached to the frame, a voice coil body having a shape corresponding to the shape of the diaphragm, and the voice coil. a magnetic circuit having a magnetic gap having a shape into which a body can be inserted and attached to the frame, the magnetic circuit having a plurality of first engaging parts protruding outward from an outer peripheral surface, and is a method of manufacturing a speaker device including a plurality of second engaging portions that engage with the first engaging portion to determine the position of the magnetic circuit, each of which engages with the second engaging portion. A jig including a plurality of third engaging portions is attached to a portion of the frame corresponding to the magnetic circuit, the voice coil body is attached to the jig attached to the frame, and the diaphragm and the voice coil body are attached. Connect with.

According to the method for manufacturing a speaker device, by using the jig, the voice coil body can be arranged in a stable positional relationship with respect to the frame with the second engaging portion as a reference. Further, by engaging the second engaging portion and the first engaging portion, the magnetic circuit can be attached to the frame in a stable positional relationship. Therefore, it is possible to manufacture a speaker device in which the positional relationship between the diaphragm, the voice coil body, and the magnetic circuit is stable based on the frame.

FIG. 1 is a perspective view showing a speaker device according to an embodiment. FIG. 2 is a perspective view showing the inside of the speaker device according to the embodiment, with the diaphragm and the like omitted. FIG. 3 is a sectional view showing a cross section of the speaker device according to the embodiment taken along the line II shown in FIG. FIG. 4 is a perspective view showing the speaker according to the embodiment from the back side.

As shown in these figures, the speaker device 100 includes two magnetic circuits 110, two voice coil bodies 120, two diaphragms 130, and one frame 140. In the case of this embodiment, the speaker device 100 includes a connecting member 161, a positive input terminal 162 that is one of a set of input terminals, and a negative input terminal 163 that is the other input terminal. The speaker device 100 is a speaker device that is attached to a moving object such as a car, and is a thin speaker device that can be embedded in a limited space inside the moving object.

The magnetic circuit 110 is a component that generates steady magnetic flux. The magnetic circuit 110 is attached to the frame 140 so as to be located behind the diaphragm 130, and includes an annular magnetic gap facing the diaphragm 130. The magnetic gap is an air gap that generates a steady magnetic flux in a direction intersecting the magnetic flux generated in the voice coil body 120. Note that in this specification, the front is the direction in which sound from the speaker device 100 is emitted, and the rear is the direction opposite to the direction. The magnetic circuit 110 includes a magnet 112, a top plate 113, and a yoke 114. In the case of this embodiment, the magnetic circuit 110 is of an internal magnetic type as shown in FIG. 3, and includes a sub-magnet 115 for strengthening magnetic force.

FIG. 5 is a perspective view showing a magnetic circuit and a voice coil body. FIG. 6 is a plan view showing a magnetic circuit and a voice coil body. The yoke 114 is a member that is made of a ferromagnetic material and guides the magnetic flux generated from the magnet 112 to a predetermined magnetic gap. The yoke 114 has a cylindrical shape with a bottom, and the shape of a plane parallel to the diaphragm 130 (XY plane in the figure) is an ellipse. Yoke 114 accommodates magnet 112 coaxially. Further, the peripheral wall 117 of the yoke is provided with a slit 116 through which a signal line 123 extending radially outward from the magnetic gap and drawn out from the voice coil body 120 passes. In addition, the portion of the peripheral wall 117 of the yoke that faces the extension portion 124 from which the signal line 123 is drawn out from the voice coil body 120 and is connected to the slit 116 is hollowed out on the extension portion 124 side and becomes a thin wall portion 118 of the yoke. ing. The thin portion 118 of the yoke avoids interference with the signal line 123 when the speaker device 100 is driven, and suppresses loss of the magnetic field generated in the magnetic gap. Further, the yoke 114 includes a first engaging portion 111.

The slit 116 is a groove-shaped portion that is depressed from the front end surface of the peripheral wall 117 of the yoke toward the vibration direction of the diaphragm 130 (Z-axis direction in the figure) and is open at both ends. In the case of this embodiment, the distance from the part of the signal line 123 that passes through the slit 116 to the bottom of the slit 116 is set longer than the distance from the part of the signal line 123 parallel to the diaphragm 130 to the diaphragm 130. ing. The bottom surface of the slit 116 is flush with the top surface of the bottom of the yoke 114. The number of slits 116 provided in the yoke 114 can be one through which two signal lines 123 pass, or two through which two signal lines 123 pass, but in the case of this embodiment, two slits are provided. A slit is provided. The inner corner of the slit 116 is provided with a chamfered portion 119 of the yoke, which is chamfered along the wiring shape of the signal line 123 .

As described above, by providing the slit 116 in the yoke 114, even when the distance between the yoke 114 and the diaphragm 130 is short, the voice coil body 120 can be made longer without the signal line 123 interfering with the peripheral wall 117 of the yoke 114. It can be driven by amplitude (stroke). Therefore, it is possible to provide a speaker device 100 that is thin but has a wide dynamic range.

The first engaging part 111 is a part that protrudes outward from the outer circumferential surface of the yoke 114, and by engaging with the second engaging part 141 (details will be described later) of the frame 140, the magnetic circuit 111 is connected to the frame 140. This is the part that performs positioning including the posture of the The protruding directions of the plurality of first engaging parts 111 are not particularly limited as long as they are different from each other, but in the case of this embodiment, the first engaging parts 111 are projected in the longitudinal direction of the yoke 114. Two locations are provided in opposite directions, and two locations are provided in opposite directions in the lateral direction of the yoke 114, for a total of four locations. Further, the position where the first engaging part 111 is attached is not particularly limited, but in the case of this embodiment, the first engaging part 111 that protrudes in the longitudinal direction is arranged at the center in the transverse direction. , the first engaging portion 111 protruding in the lateral direction is arranged at the center in the longitudinal direction. Although the shape of the first engaging portion 111 is not particularly limited, in the case of this embodiment, it is a rectangular parallelepiped shape including a cube, and the surface facing the diaphragm 130 is flush with the main body of the yoke 114. It has become. Further, the surface of the first engaging portion 111 facing the diaphragm 130 is a cut surface that is cut together with the main body of the yoke 114. Note that, in the first engaging portion 111, a surface that intersects with the longitudinal direction of the yoke 114 and a surface that intersects with the lateral direction of the yoke 114 may be cut surfaces.

Further, in the case of this embodiment, one of the first engaging portions 111 is arranged between the slits 116 provided at two locations in the yoke 114. Thereby, the groove portion 143 (details will be described later) provided in the frame 140 and the slit 116 can be accurately aligned.

The top plate 113 is made of the same ferromagnetic material as the yoke 114. The shape of the surface of the top plate 113 parallel to the diaphragm 130 is not particularly limited, but in the case of this embodiment, it is an oval shape corresponding to the shape of the yoke 114, and It is arranged on the surface of the magnet 112 on the diaphragm 130 side. A magnetic gap, which is an annular and oval (track-shaped) gap, is formed between the top plate 113 and the yoke 114.

The magnet 112 is a rod-shaped permanent magnet. The sub-magnet 115 is an oblong plate-shaped permanent magnet. For the magnet 112 and the sub-magnet 115, it is preferable to use, for example, a neodymium-based magnet having high magnetic energy. Thereby, the thickness of the magnet 112 can be reduced, the thickness of the entire speaker device 100 can be reduced, and as a result, the weight can be reduced.

The magnet 112 has a north pole at one end in the thickness direction (Z-axis direction in the figure) and a south pole at the other end. A top plate 113 is fixed to one pole side surface of the magnet 112, and a yoke 114 is fixed to the other pole side surface. Further, a plate-shaped sub-magnet 115 is arranged on the opposite side of the magnet 112 with respect to the top plate 113. A strong steady magnetic flux is generated in the magnetic gap by the magnet 112 and the sub-magnet 115. The method of fixing the top plate 113, magnet 112, yoke 114, and sub-magnet 115 is not particularly limited, but in this embodiment, they are fixed using an adhesive.

In the case of this embodiment, the magnetic circuits 110 are arranged side by side in the longitudinal direction of the speaker device 100 (Y-axis direction in the figure). The overall shape of the magnetic circuit 110 is set such that the length in the width direction (X-axis direction in the figure) perpendicular to the alignment direction (X-axis direction in the figure) is shorter than the length in the line-up direction (Y-axis direction in the figure). Similarly, the length of the magnetic gap in the width direction is set to be shorter than the length in the alignment direction.

The two magnetic circuits 110 attached to the frame 140 are magnetized in the same direction with respect to the yoke 114. That is, the magnets 112 are arranged so that the directions of magnetism from the top plate 113 toward the yoke 114 are the same. Further, the two magnetic circuits 110 are inserted into through holes provided in the bottom of the box-shaped frame 140.

Note that the top plate 113, magnet 112, yoke 114, and sub-magnet 115 may be fixed using fastening members such as screws and rivets. Further, the magnetic circuit 110 may be an external magnetic type magnetic circuit.

The voice coil body 120 is a component whose one end is disposed within the magnetic gap of the magnetic circuit 110 and whose other end is attached to the diaphragm 130, and current is applied to the coil 121 within the gap where a steady magnetic flux is generated. This is a component that vibrates due to the force generated in the direction of the winding axis (Z-axis direction in the figure) due to the flow. The winding axis (center axis) of the voice coil body 120 is arranged in the direction of vibration (amplitude) of the diaphragm 130 (Z-axis direction in the figure), and is orthogonal to the direction of magnetic flux in the magnetic gap. In the case of this embodiment, the voice coil body 120 includes a coil 121 formed by winding a single metallic wire into an oval shape, and a bobbin 122 around which the wire is wound. The bobbin 122 is a cylindrical member with an oval cross section 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.

Further, at the end of the bobbin 122 on the diaphragm 130 side (front side), there is a tongue portion 125 that is bent inward in the radial direction of the bobbin 122 (see FIGS. 2, 5, and 6). ). The tongue portion 125 is a portion for increasing the contact area with the diaphragm 130 and increasing the adhesive strength between the diaphragm 130 and the bobbin 122. In the case of this embodiment, the tongue portion 125 is formed by providing triangular notches arranged in the circumferential direction at one end of the cylindrical bobbin 122, and bending the remaining triangular portion inward to form the tongue portion. It is set at 125.

From the voice coil body 120, signal wires 123 (see FIG. 2), which are respectively connected to both ends of the wire constituting the coil 121, extend from an extension portion 124 (see FIG. 2). The extending portion 124 is fixed to the bobbin 122. The signal line 123 is sometimes called a gold thread wire, a tinsel wire, or the like. In the case of the present embodiment, the signal line 123 is wired in space from the extending portion 124 along the outer circumferential shape of the bobbin 122 of the voice coil body 120 in parallel or almost parallel to the diaphragm 130 . The wires are wired in space so as to pass through the slit 116 while maintaining a parallel state. Further, the signal line 123 is wired so as to pass through a groove 143 provided in the frame 140 at a position communicating with the slit 116. By wiring the signal line 123 in space as described above, strong tension is not generated in the signal line 123 even when the amplitude of the voice coil body 120 is large, and the signal line 123 can be connected while the speaker device 100 is being driven. Interference with the yoke 114 etc. can be prevented.

The signal line 123 is pulled out to the outside through a plurality of wiring holes 142 provided at the bottom of the frame 140, and is electrically connected to a positive input terminal 162 and a negative input terminal 163 attached to the outer surface of the frame 140, respectively. Connected. External wiring 170 (see FIGS. 1 and 4), which is connected to an amplifier or the like, is electrically connected to the two input terminals. Note that the wiring hole 142 is sealed with a terminal, solder, or the like.

FIG. 7 is a perspective view schematically showing two coils 121, a connecting member 161, a positive input terminal 162, and a negative input terminal 163. As shown in the figure, the winding directions of the coils 121 included in the two voice coil bodies 120 are the same, and the two coils 121 are connected in series. In other words, when a direct current flows from one open end of two coils 121 connected in series to the other open end, the magnetic fields generated in each coil 121 point in the same direction.

Furthermore, two of the signal lines 123 extending from the two coils 121 are electrically connected by a connecting member 161 attached to the outside of the frame 140. Although the method of connecting the signal line 123 and the connecting member 161 is not particularly limited, in the case of this embodiment, the connection is made with solder (not shown).

The connection member 161 is a member made of a conductor, and in the case of this embodiment, a member in which a through hole is provided in a rectangular copper plate at a position corresponding to the wiring hole 142 is employed as the connection member 161.

The other two of the signal lines 123 extending from the two coils 121 are electrically connected to a positive input terminal 162 and a negative input terminal 163 attached to the outside of the frame 140, respectively. The positive input terminal 162 and the negative input terminal 163 are terminals into which electrical signals are input, and are electrically connected to an external wiring 170 (see FIG. 4). In the case of this embodiment, the connecting member 161, the positive input terminal 162, and the negative input terminal 163 are members of the same shape. The connection member 161, the positive input terminal 162, the negative input terminal 163, and the signal line 123 are connected from the outside of the frame 140 with solder. Further, the connecting member 161, the positive input terminal 162, and the negative input terminal 163 may be insert-molded together with the resin frame 140.

In the case of the present embodiment, as shown in FIG. 8, the two magnetic circuits 110 are arranged virtually in the longitudinal center of the speaker device 100 and have a first virtual plane 201 perpendicular to the longitudinal direction, and a first virtual plane 201 that is perpendicular to the longitudinal direction; It is plane symmetrical with respect to each of the second virtual planes 202 that are virtually arranged in the center of the direction and perpendicular to the lateral direction. Note that the overall shape of the voice coil body 120 and the position of the extending portion 124 are plane symmetrical with respect to the first imaginary plane 201 and the second imaginary plane 202, but the winding direction of the coil 121 is not plane symmetrical with respect to the first virtual plane 201. Since the extending portions 124 are arranged to face each other as in this embodiment, the signal lines 123 extending from the extending portions 124 are wired in a concentrated manner in the center of the frame 140. Therefore, the connecting member 161 for connecting the signal line 123 to connect the coils 121 in series can also be placed in the center of the frame 140 between the two voice coil bodies 120, and extends from the two coils 121, respectively. The output signal line 123 can be connected in a short state. This allows the signal line 123 to be wired in a simple manner within the frame 140.

The two diaphragms 130 are members to which the tip ends of the voice coil body 120 are respectively coupled, and can be displaced in the front-rear direction (Z-axis direction in the figure) based on the neutral position based on the vibration of the voice coil body 120. This is a member that vibrates the air and generates sound. In the case of this embodiment, the shape of the diaphragm 130 is a flat plate, and the outer shape in plan view from the vibration direction is an ellipse. The outer circumference of the diaphragm 130 is attached to the front end surface of the wall of the frame 140 via an edge 131 that has more flexibility and resilience than the diaphragm 130. Further, the portion of the edge 131 attached to the frame 140 is protected by a gasket 134. In the case of this embodiment, the gasket 134 is provided with two oval-shaped through holes corresponding to the outer peripheral shape of the edge 131, and the two edges 131 are connected by one gasket 134.

The diaphragm 130 is connected to the voice coil body 120 in the longitudinal direction at a primary resonance node portion of the diaphragm 130 (indicated by a broken line arrow in FIG. 3). In other words, the length of the voice coil body 120 in the longitudinal direction corresponds to the distance from one resonance node of the diaphragm 130 to another node.

Note that the shape of the diaphragm 130 in plan view is not particularly limited, and may be an ellipse, a rectangle with rounded corners, or the like. The material constituting the diaphragm 130 is not particularly limited, and examples thereof include paper, resin, foamed resin, and a honeycomb flat plate.

The frame 140 is a structural member that holds the magnetic circuit 110 and the diaphragm 130. Although the shape of the frame 140 is not particularly limited, in the case of this embodiment, it is a thin rectangular box shape, and mounting holes 149 are provided at both ends in the longitudinal direction. The frame 140 includes oval spaces arranged in the longitudinal direction when viewed from above. A through hole into which the magnetic circuit 110 is inserted from the rear is provided at the bottom of the frame 140.

A penetrating working hole 145 is provided in the side wall of the frame 140. The working hole 145 is a hole for inserting jigs, tools, etc. when assembling the speaker device 100. In the case of the present embodiment, openings provided in the frame 140 such as the working hole 145 are attached with a cover member (not shown) to prevent dust from entering after the assembly work is completed so as to cover the openings. The cover member is not particularly limited as long as it can prevent dust from entering, but a mesh-like member that allows air to pass through and prevents dust from entering may be used. Such a cover member allows the acoustic characteristics of the speaker device 100 to be adjusted.

The frame 140 also includes a plurality of second engaging portions 141 that respectively engage with the plurality of first engaging portions 111 protruding from the circumferential surface of the yoke 114 of the magnetic circuit 110 to determine the position of the magnetic circuit 110. (See Figure 4). In the case of this embodiment, the second engaging portions 141 are provided at four locations in total at positions corresponding to the first engaging portions 111. The shape of the second engaging part 141 is not particularly limited as long as it corresponds to the shape of the first engaging part 111, but in the case of this embodiment, the magnetic The second engaging part 141 has a surface facing the magnetic circuit 110 and a surface opposite to the diaphragm 130 (frame 140) has an open cutout shape. Further, after the magnetic circuit 110 is attached to the frame 140, the depth of the second engaging portion 141 is set to a depth of 100 mm in the vibration direction of the diaphragm 130 so that the second engaging portion 141 can be filled with adhesive. It is deeper than the thickness of one engaging portion 111 .

FIG. 9 is a sectional view taken along the line II-II shown in FIG. 4. As shown in the same figure and FIG. A recessed adhesive filling portion 144 is provided on the side opposite to the diaphragm 130 and is open. The adhesive filling portion 144 can fill the yoke 114 attached to the frame 140 with adhesive from the outside of the frame 140, thereby suppressing the adhesive from flowing and spreading. This allows the magnetic circuit 110 to be firmly fixed to the frame 140. The shape of the adhesive filling part 144 is not particularly limited, but in the case of this embodiment, the adhesive filling part 144 is arranged so as to surround the outer periphery of the yoke 114 and extends from the diaphragm 130 side toward the back side. It is a tapered groove that gradually widens.

Next, a method of manufacturing the speaker device will be explained. FIG. 10 is a perspective view showing the frame and the jig before attachment. As shown in the figure, the jig 300 is a member that has a shape imitating the external shape of the magnetic circuit 110 and is used when assembling the speaker device 100, and includes a third engaging portion 301, a signal line holding portion 302, A voice coil body holding section 303 is provided.

The third engaging portions 301 are a plurality of portions that respectively engage with the second engaging portions 141 provided on the frame 140, and protrude in the same direction as the first engaging portions 111 provided in the magnetic circuit 110. They have almost the same shape except for the thickness in the direction. Note that the thickness of the third engaging portion 301 is set to be thicker than the thickness of the first engaging portion 111.

The voice coil body holding portion 303 is a portion that can hold the voice coil body 120 in an accurate positional relationship with respect to at least the third engaging portion 301. In the case of this embodiment, voice coil body holding portion 303 is fitted into voice coil body 120 to hold voice coil body 120 in an accurate positional relationship in the circumferential direction. Further, in the vibration direction of the diaphragm 130, the voice coil body 120 is prevented from moving backward by coming into contact with the end of the coil 121.

The signal line holding section 302 is a part that holds the signal line 123 extending from the voice coil body 120 held by the voice coil body holding section 303. In the case of this embodiment, the two signal lines 123 extending from the voice coil body 120 are held by the signal line holding section 302 so as to be sandwiched therebetween. This makes it possible to solder the connection member 161, the positive input terminal 162, and the negative input terminal 163 while maintaining the signal line 123 extending in space at an accurate position.

The speaker device 100 is manufactured using the jig 300 described above. First, as shown in FIG. 11, two jigs 300 are attached to portions of the frame 140 corresponding to the magnetic circuits 110, respectively. As a result, the third engaging portion 301 engages with the second engaging portion 141, and the positional relationship of the voice coil body holding portion 303 with respect to the frame 140 is determined. The manufacturing method will be described below focusing on one jig 300, but the speaker device 100 can be manufactured using the same manufacturing method for other jigs 300 as well.

Next, as shown in FIG. 12, the voice coil body 120 is attached to the voice coil body holding portion 303 of the jig 300 attached to the frame 140. Further, the signal line holding section 302 is caused to hold the signal line 123 drawn out from the voice coil body 120.

In the above state, the diaphragm 130 to which the edge 131 is attached is connected to the voice coil body 120, and the signal line 123 and the connecting member 161, which is a terminal, the positive input terminal 162, and the negative input terminal 163 are connected.

Next, the diaphragm 130 is attached to the frame 140 via the edge 131, and the gasket 134 is attached.

Next, the jig 300 is removed from the frame 140, and adhesive is applied to the surface of the second engaging portion 141 on the diaphragm 130 side. The magnetic circuit 110 is attached to the frame 140 from the opposite side of the diaphragm 130 by inserting the first engaging part 111 into the second engaging part 141 after applying the adhesive. Thereby, the magnetic circuit 110 is temporarily fixed to the frame 140 at an accurate position. Moreover, the magnetic circuit 110 and the voice coil body 120 also have a mutually accurate positional relationship. Further, the signal line 123 and the slit 116 also have a correct positional relationship.

Next, the second engaging portion 141 and the adhesive filling portion 144 are filled with adhesive to fix the magnetic circuit 110 to the frame 140. The speaker device 100 is manufactured through the above steps.

Note that the above steps are just examples, and the order of each step may be changed, and another step may be performed before or after each step.

As in the above embodiment, the speaker device 100 is a speaker device 100 in which voice coil bodies 120 each having a different aspect ratio are connected to a diaphragm 130 having a different aspect ratio in a plan view, and a coil 121 is connected in series. I will provide a.

In particular, when the coils 121 of the two voice coil bodies 120 have the same winding direction and the direction of the magnetic field in the magnetic gap of the two magnetic circuits 110 is the same, that is, the two voice coil bodies 120 and the magnetic circuit 110 Since parts of the same standard can be used, mistakes in mounting the magnetic circuit 110 and the voice coil body 120 can be avoided, and product costs can be reduced by standardizing the parts.

In addition, by arranging the extending portions 124 of the two voice coil bodies 120 to face each other, the signal line 123 extending from the coil 121 can be shortened, and the wiring state of the signal line 123 within the frame 140 can be simplified. Furthermore, by arranging the extending portions 124 of the two voice coil bodies 120 to face each other, the wiring condition of the signal line 123 extending from the coil 121 is set to the same condition. Therefore, the acoustic characteristics reproduced from the two speakers can be made equal, and distortion can be reduced.

Further, since the voice coil body 120 and the diaphragm 130 are connected with high bonding strength by the tongue portion 125, high durability can be achieved.

In addition, by attaching the voice coil body 120 to the resonance node position of the diaphragm 130 in the longitudinal direction, the relatively long and large diaphragm 130 can be vibrated while suppressing the primary resonance mode, and can be flattened. It is possible to realize sound pressure frequency characteristics.

Furthermore, by using the jig 300, the positional relationship between the diaphragm 130, the voice coil body 120, and the magnetic circuit 110 can be accurately attached with reference to the frame 140, and the speaker device 100 can be manufactured easily and stably. can do.

Furthermore, since the magnetic circuit 110 is fixed to the frame 140 with the first engaging part 111 and the second engaging part 141 engaged, even if the speaker device 100 is installed in a place with a lot of vibration, etc. It becomes possible to maintain the performance of the speaker device 100 for a long period of time.

Note that the present disclosure is not limited to the above embodiments. For example, other embodiments of the present disclosure may be implemented by arbitrarily combining the components described in this specification or by excluding some of the components. Further, the present disclosure also includes modifications obtained by making various modifications to the above-described embodiments that a person skilled in the art can think of without departing from the gist of the present disclosure, that is, the meaning indicated by the words described in the claims. It will be done.

For example, the shapes of the diaphragm 130, voice coil body 120, and magnetic gap are not limited to an ellipse (track shape) as long as they have different aspect ratios, but may be elliptical, rectangular with rounded corners, etc. But it doesn't matter.

Further, a damper having flexibility and restorability may be provided between the frame 140 and the voice coil body 120 in a bridge-like manner. The damper is a member that assists the direct movement of the voice coil body 120 of the speaker device 100 during driving and adjusts the acoustic characteristics. The damper deforms according to vibrations in the winding axis direction (Z-axis direction in the figure) of the voice coil body 120 when the speaker device 100 is driven, and keeps the voice coil body 120 neutral when no electrical signal is input to the voice coil body 120. hold in position.

The damper may include a notch-shaped dividing portion that divides a part of the ring shape in the circumferential direction at a position corresponding to the extending portion 124 of the signal line 123 extending from the voice coil body 120. The dividing portion is a portion that completely divides the annular damper in the circumferential direction, and is different from a notch that leaves part of the damper as a complete annular shape. The damper has a C-shape when viewed in plan from the Z-axis direction due to the presence of the divided portion.

At least a portion of the damper may be attached to the voice coil body 120 at the same position as the extension portion 124 in the vibration direction of the voice coil body 120 (Z-axis direction in the figure). The dividing portion is arranged so as to overlap the extending portion 124 in the radial direction (Y-axis direction in the figure) perpendicular to the vibration direction of the voice coil body 120. The dividing portion is wired so that the signal line 123 passes through it.

In this way, by providing the annular damper with a circumferentially dividing section, even if the length of the voice coil body 120 protruding from the magnetic gap in the winding axis direction is shortened, the signal line 123, the damper, and the diaphragm 130 can be easily connected to each other. interference with can be avoided. Therefore, it is possible to achieve desired acoustic characteristics even though the speaker device 100 is thin.

The present disclosure is useful for relatively thin speaker devices.

100 Speaker device 110 Magnetic circuit 111 First engaging portion 112 Magnet 113 Top plate 114 Yoke 115 Sub magnet 116 Slit 117 Peripheral wall of yoke 118 Thin portion of yoke 119 Chamfered portion of yoke 120 Voice coil body 121 Coil 122 Bobbin 123 Signal line 124 Extension portion 125 Tongue portion 130 Vibration plate 131 Edge 134 Gasket 140 Frame 141 Second engaging portion 142 Wiring hole 143 Groove portion 144 Adhesive filling portion 145 Working hole 149 Mounting hole 161 Connection member 162 Positive input terminal 163 Negative input terminal 170 External wiring 201 First virtual surface 202 Second virtual surface 300 Jig 301 Third engaging portion 302 Signal line holding portion 303 Voice coil body holding portion

Claims (4)

two magnetic circuits that are arranged side by side and have a shorter length in the width direction perpendicular to the arrangement direction than the length in the arrangement direction;
two voice coil bodies whose length in the width direction is shorter than the length in the alignment direction corresponding to the shape of the magnetic circuit;
two diaphragms whose length in the width direction is shorter than the length in the arrangement direction and which are respectively coupled to the two voice coil bodies;
and a frame to which the two diaphragms are attached,
The magnetization directions of the two magnetic circuits are the same,
The two coils each of the voice coil bodies have have the same winding direction, are connected in series, and are connected to a set of input terminals for inputting electrical signals provided between the two voice coil bodies. speaker device. 2. The speaker device according to claim 1, wherein cross-sectional shapes of the two coils perpendicular to the winding axis direction are oval, oval, or rectangular with rounded corners. 3. The speaker device according to claim 1, wherein the two voice coil bodies are each attached to a vibration node of the diaphragm in the arrangement direction. The two voice coil bodies each include an extension portion from which a signal line extends,
The speaker device according to any one of claims 1 to 3 , wherein the two voice coil bodies are arranged so that the extending portions face each other.

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