JP7281665B2 - speaker device - Google Patents

Description

The present disclosure relates to speaker devices. More specifically, the present invention relates to a twin-drive speaker device that uses two voice coils to drive one diaphragm.

As described in Patent Document 1, there is a speaker device in which two voice coils are attached to one diaphragm and driven based on two magnetic circuits. In the case of such a diaphragm driven by two voice coils, it is necessary to match the phases of the vibrations of the voice coils.

Japanese Utility Model Laid-Open No. 6-013293

However, when a set of input terminals for inputting audio signals is provided in the center of the speaker device, that is, between the two voice coils, and the two voice coils are connected in parallel without crossing the wiring of the signal line. , the magnetization direction of the magnetic circuit must be reversed to each other, or the winding direction of the voice coil must be reversed to each other. Moreover, if such a configuration is not used, the construction method becomes complicated, for example, the wiring of the signal lines becomes complicated.

SUMMARY OF THE INVENTION An object of the present disclosure is to provide a speaker device in which two voice coil bodies are attached to one diaphragm, and in which wiring of signal lines is easy.

In order to achieve the above object, one aspect of the present invention provides a speaker device comprising: two magnetic circuits each having a magnetic gap; two voice coil bodies inserted into the magnetic gap; A diaphragm coupled to a voice coil body and a frame to which the diaphragm is attached are provided, and two coils of the voice coil bodies are connected in series and provided between the two voice coil bodies. connected to a set of input terminals for audio signal input.

Even if the speaker device according to the present disclosure is a speaker device to which two voice coil bodies are attached, by providing a set of input terminals for inputting audio signals collectively at the center of the speaker device, signal line Wiring 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 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 schematically showing two coils, a connection member, a positive input terminal, and a negative input terminal. FIG. 6 is a perspective view showing the symmetry of the speaker device according to the embodiment. FIG. 7 is a cross-sectional view taken along the line II shown in FIG. 1, showing the positional relationship between the diaphragm and the voice coil body of the speaker device according to the embodiment.

Embodiments of the speaker device will be described below with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in independent claims representing the highest concept will be described as arbitrary constituent elements.

In addition, the drawings are schematic diagrams with appropriate emphasis, omission, and ratio adjustment for the purpose of illustrating the present disclosure, and may differ from the actual shape, positional relationship, and ratio.

A speaker device according to an aspect of the present disclosure includes two magnetic circuits each having a magnetic gap, two voice coil bodies inserted into the magnetic gap, and vibration coupled to the two voice coil bodies. A plate and a frame to which the diaphragm is attached, and the two coils of the voice coil body are connected in series and connected to a set of input terminals for inputting audio signals.

According to the speaker device, by collectively providing a set of input terminals for inputting audio signals in the central portion of the speaker device, wiring of signal lines can be facilitated, and wiring with the outside can also be facilitated. can.

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 cross-sectional view showing a cross section of the speaker device according to the embodiment taken along 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, one diaphragm 130, and a frame 140. FIG. In the case of this embodiment, the speaker device 100 includes a connection member 161, a positive input terminal 162 that is one of a pair of input terminals, and a negative input terminal 163 that is the other of the pair of input terminals. . The speaker device 100 is a speaker device attached to a mobile body such as an automobile, and is a thin speaker device that can be embedded in a limited space in the mobile body.

The magnetic circuit 110 is a component that generates steady magnetic flux. The magnetic circuit 110 is attached to the frame 140 behind the diaphragm 130 and has an annular magnetic gap facing the diaphragm 130 . The magnetic gap is an air gap that generates steady magnetic flux in a direction intersecting the magnetic flux generated in voice coil body 120 . In this specification, the front is the direction in which the sound of the speaker device 100 is emitted, and the rear is the opposite direction.

In the case of this embodiment, the magnetic circuit 110 is of the internal magnet type as shown in FIG. A magnetic gap, which is an annular gap, is formed between the yoke 114 and the top plate 113 .

Top plate 113 and yoke 114 are made of a ferromagnetic material. The shapes of top plate 113 and yoke 114 are not particularly limited. In the case of the present embodiment, the top plate 113 has a disk shape and is arranged on the surface of the magnet 112 on the side of the diaphragm 130 . The yoke 114 has a bottomed cylindrical shape and accommodates the magnet 112 coaxially.

The magnet 112 is a cylindrical permanent magnet. The sub-magnet 115 is a disk-shaped permanent magnet. Magnets 112 and sub-magnets 115 preferably use, for example, neodymium-based magnets with high magnetic energy. As a result, the thickness of the magnet 112 can be reduced, and the thickness of the speaker device 100 as a whole can be reduced. Furthermore, weight reduction can also be realized.

The magnet 112 has an N pole at one end in the thickness direction (the Z-axis direction in the figure) and an S 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. A disk-shaped sub-magnet 115 is arranged on the opposite side of the magnet 112 with respect to the top plate 113 . A strong 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, the magnet 112, the yoke 114, and the sub-magnet 115 is not particularly limited, but in the case of this embodiment, they are fixed with an adhesive.

In this embodiment, the two magnetic circuits 110 are magnetized in the same direction with respect to the yoke 114 . In other words, the magnets 112 are arranged so that the magnetic directions from the top plate 113 to the yoke 114 are the same. Also, the two magnetic circuits 110 are attached to one frame 140 . Specifically, the two magnetic circuits 110 are attached to one pedestal portion 144 that is arranged in a bridge-like manner in the lateral direction in the center of the housing portion 143 of the frame 140 in the longitudinal direction. Wiring holes 142 are provided between the two magnetic circuits 110 of the base portion 144 .

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 form of the magnetic circuit 110 provided in the speaker device 100 is not particularly limited, and an outer magnet type magnetic circuit may be employed.

The voice coil body 120 is a component whose one end is placed in the magnetic gap of the magnetic circuit 110 and whose other end is attached to the diaphragm 130, and is wound by the current of the input electric signal and the magnetic flux between the magnetic gaps. It is a component that vibrates due to a force generated in the axial direction (the Z-axis direction in the figure). The winding axis (central axis) of the voice coil body 120 is arranged in the vibration (amplitude) direction of the diaphragm 130 (the Z-axis direction in the drawing), and is perpendicular to the direction of the magnetic flux in the magnetic gap. In the case of the present embodiment, voice coil body 120 includes coil 121 formed by winding a single metallic wire into an annular (cylindrical) shape a plurality of times, and bobbin 122 around which the wire is wound. ing. The bobbin 122 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 located within the magnetic gap.

At the end of the bobbin 122 on the side of the diaphragm 130 (front side), there is a tongue portion 125 that is bent outward in the radial direction of the bobbin 122 (see FIG. 2). The tongue portion 125 is a portion for increasing the bonding strength between the diaphragm 130 and the bobbin 122 by increasing the contact area with the diaphragm 130 . In the case of this embodiment, the tongue portion 125 is formed by arranging triangular cuts in the circumferential direction at one end of the cylindrical bobbin 122 and bending the remaining triangular portion so as to open outward. 125. In addition, the tongue portion 125 that is bent in the short direction (the X-axis direction in the figure) of the long rectangular diaphragm 130 is shorter than the tongue portion 125 that is bent in the longitudinal direction (the Y-axis direction in the figure). or cut to remove tongue 125 . As a result, it is possible to use the bobbin 122 having a large diameter close to the length of the long rectangular diaphragm 130 in the width direction while increasing the bonding strength between the diaphragm 130 and the bobbin 122 by means of the tongue portion 125 . Become.

Note that the tongue piece portion 125 is not limited to a triangular shape, and any shape such as a rectangle can be adopted.

From the voice coil body 120, both ends of the wire constituting the coil 121 are extended from the extending portions 124 (see FIG. 2) as the signal lines 123 (see FIG. 2). The signal line 123 is called a gold thread line, a tinsel line, or the like. The signal line 123 is routed through a radially extending groove provided in the cylindrical portion of the frame 140 to which the damper is attached. The signal line 123 is electrically connected to a positive input terminal 162 and a negative input terminal 163 attached to the outer surface of the frame 140 through wiring holes 142 provided in the frame 140 . An external wiring 170 connected to an amplifier or the like is electrically connected to the two input terminals. The wiring hole 142 is sealed with a terminal, solder, or the like.

FIG. 5 is a perspective view schematically showing two coils 121, a connection member 161, a positive input terminal 162 and a negative input terminal 163. FIG. As shown in the figure, coils 121 included in two voice coil bodies 120 have the same winding direction and are connected in series. That is, 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 the respective coils 121 are oriented in the same direction.

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 . The method of connecting the signal line 123 and the connecting member 161 is not particularly limited, but in the case of the present embodiment, they are connected by solder (not shown).

The connection member 161 is a member made of a conductor, and in the case of the present embodiment, a rectangular copper plate having through holes provided at positions corresponding to the wiring holes 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. A positive input terminal 162 and a negative input terminal 163 are terminals to which an audio signal is 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 having the same shape. Also, 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. FIG.

The damper 150 is a member having flexibility and resilience and is attached in a bridge-like manner between the frame 140 and the voice coil body 120. It is a member that adjusts acoustic characteristics. The damper 150 deforms according to the vibration of the voice coil body 120 in the direction of the winding axis (the Z-axis direction in the figure) when the speaker device 100 is driven, and dampens the voice coil body 120 when no audio signal is input to the voice coil body 120. Maintain in neutral position.

The material constituting the damper 150 is not particularly limited, and can be arbitrarily selected according to desired acoustic characteristics, such as fabric impregnated with resin, rubber, and elastomer.

In the case of the present embodiment, the damper 150 has a dividing portion 154 (see FIG. 2) 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. ). In the case of the present embodiment, the dividing portion 154 is a portion that completely divides the annular damper 150 in the circumferential direction, and is different from a notch that leaves a part of the damper 150 as a complete ring. Due to the presence of the dividing portion 154, the damper 150 has a C shape when viewed from above in the Z-axis direction.

At least part of the damper 150 is attached to the voice coil body 120 so as to be at the same position as the extension 124 in the vibration direction of the voice coil body 120 (the Z-axis direction in the drawing). The dividing portion 154 is arranged so as to overlap the extending portion 124 in the radial direction (the Y-axis direction in the drawing) perpendicular to the vibration direction of the voice coil body 120 . The dividing portion 154 is wired so that the signal line 123 passes through it, as shown in FIG.

Thus, by providing the dividing portion 154 for dividing the annular damper 150 in the circumferential direction, even if the length of the voice coil body 120 projecting from the magnetic gap in the winding axis direction is shortened, the signal line 123 and the damper 150 can be Interference with diaphragm 130 can be avoided. Therefore, it is possible to achieve desired acoustic characteristics even with the thin speaker device 100 .

In the case of the present embodiment, the two dampers 150 included in the speaker device 100 are symmetrical with respect to a first imaginary plane 201 that virtually bisects the diaphragm 130 in the longitudinal direction, as shown in FIG. are placed. As a result, the influence of the dividing portion 154 provided in the damper 150 on the vibration of the voice coil body 120 can be canceled, and the acoustic characteristics of the speaker device 100 can be improved. In the case of the present embodiment, damper 150 is also plane-symmetrical with respect to second imaginary plane 202 that virtually bisects diaphragm 130 in the lateral direction.

The two magnetic circuits 110 are also plane-symmetric with respect to the first virtual plane 201 and the second virtual plane 202, respectively. Note that the overall shape of voice coil body 120 and the position of extension 124 are symmetrical with respect to first virtual plane 201 and second virtual plane 202, respectively. are not symmetrical with respect to the first virtual plane 201 . Since the extending portions 124 are arranged facing each other as in the present embodiment, the signal lines 123 extending from the extending portions 124 are concentrated in the central portion 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 arranged in the central portion of the frame 140 between the two voice coil bodies 120, extending from the two coils 121 respectively. The output signal line 123 can be connected in a short state, and the signal line 123 can be in a simple wiring state within the frame 140 .

Note that the shape of the damper 150 is not particularly limited. For example, as shown in FIG. 3, the cross section of the damper 150 is not only V-shaped, but may be concentrically wavy (wavy). Also, the damper 150 may be attached to a location other than the bobbin 122 . Also, the mounting position of the damper 150 is not limited to the bobbin 122 , and the damper 150 may connect the diaphragm 130 and the frame 140 .

Diaphragm 130 is a member to which the tip of voice coil body 120 is coupled. Diaphragm 130 is displaced in the front-rear direction (the Z-axis direction in the drawing) with respect to the neutral position based on the vibration of voice coil body 120 to move air. A member that vibrates to produce sound. In the case of the present embodiment, the shape of diaphragm 130 is a flat plate shape, and the outer shape in plan view in the vibration direction is a track shape. The outer peripheral portion of the diaphragm 130 is attached to the front end face of the wall portion of the frame 140 via an edge 131 having more flexibility and resilience than the diaphragm 130 . Also, the portion of edge 131 attached to frame 140 is protected by gasket 134 .

Diaphragm 130 has two voice coil bodies 120 arranged side by side in the longitudinal direction (the Y-axis direction in the figure) and joined together. As shown in FIG. 7, the distance L from the center of diaphragm 130 to the edge that intersects second imaginary plane 202 in the longitudinal direction is the length X from the center of diaphragm 130 to the winding axis of voice coil body 120. is set within a range of 2.27 times or more and 2.74 times or less.

The shape of the diaphragm 130 in plan view is not particularly limited, and may be an elliptical shape including a track shape, a rectangular shape, or the like. The material forming diaphragm 130 is not particularly limited, but examples thereof include paper and resin. Diaphragm 130 is also provided with a through-hole for mounting voice coil body 120, and a cap 132 (see FIG. 1) for sealing the through-hole is mounted. The cap 132 prevents foreign matter from entering the magnetic gap.

Frame 140 is a structural member that holds magnetic circuit 110 , diaphragm 130 , and damper 150 . The shape of the frame 140 is not particularly limited, but in the case of the present embodiment, it is a rectangular plate, and mounting holes 149 are provided at both ends in the longitudinal direction. The frame 140 has a track shape in a plan view, and includes an accommodating portion 143 that partially penetrates in the thickness direction. A rectangular pedestal portion 144 to which the magnetic circuit 110, the damper 150 and the like are attached is provided in a cross-linking manner in the lateral direction at an intermediate portion of the accommodating portion 143 in the longitudinal direction. A wiring hole 142 is provided in the base portion 144 .

A penetrating first working hole 145 is provided in the central portion of the side wall of the frame 140 . A second working hole 146 is provided in the base portion 144 between the two dampers 150 . The first work hole 145 and the second work hole 146 are holes for inserting jigs, tools, and the like for attaching the damper 150 and the like to the pedestal portion 144 of the frame 140 . The first working hole 145 and the second working hole 146 provided in the frame 140, and the end opening of the accommodation portion 143 opposite to the end to which the diaphragm 130 is attached are openings communicating with the dividing portion 154. Since it is a portion, dust may enter through the opening and reach the magnetic gap. Therefore, in the case of the present embodiment, a cover member (not shown) that prevents dust from entering is attached to the openings of the first working hole 145, the second working hole 146, and the housing portion 143 so as to cover the openings. ing. The cover member is not particularly limited as long as it can prevent dust from entering, but a mesh member that allows air to pass through and prevents dust from entering may be used. The acoustic characteristics of the speaker device 100 can be adjusted by such a cover member.

A speaker device 100 in which two voice coil bodies 120 are connected to one diaphragm 130 as in the above embodiment, and in which coils 121 are connected in series is provided.

In particular, when the winding directions of the coils 121 provided in the two voice coil bodies 120 are the same, and the directions of the magnetic fields in the magnetic gaps of the two magnetic circuits 110 are the same, that is, the two voice coil bodies 120 and the magnetic circuits 110 Since parts of the same standard can be used for the magnetic circuit 110 and the voice coil body 120, it is possible to avoid mounting errors and reduce the product cost.

Further, by arranging the extending portions 124 of the two voice coil bodies 120 facing each other, the signal line 123 extending from the coil 121 can be shortened, and the wiring of the signal line 123 inside the frame 140 can be simplified. It becomes possible to

Moreover, 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 realized.

In addition, by attaching the voice coil body 120 at a position within a predetermined range with respect to the diaphragm 130, the relatively long and large-sized diaphragm 130 can be controlled not only in the primary resonance mode but also in the higher order resonance modes. The voice coil body 120 can be vibrated, and even with the thin speaker device 100, it is possible to obtain a large volume with high acoustic characteristics.

In addition, while using the damper 150 having the dividing portion 154 that is completely divided in the circumferential direction, the damper 150 is arranged plane-symmetrically with respect to the first imaginary plane 201. Therefore, the influence of the dividing portion 154 is canceled, and the desired sound can be obtained. characteristics can be obtained.

In addition, since the dividing portion 154 and the extending portion 124 are arranged so as to overlap in the winding axis direction of the coil 121, the distance between the damper 150 and the diaphragm 130 can be shortened, and the thin speaker device 100 can be realized. can be realized.

Note that the present disclosure 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 disclosure. In addition, the present disclosure includes modifications obtained by making various modifications 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, with respect to the above-described embodiment. be

For example, although the speaker device 100 in which the damper 150 is attached to the voice coil body 120 and the frame 140 in a bridging manner, the speaker device 100 does not have to include the damper 150 . Moreover, the mounting position of the damper 150 is also arbitrary.

Also, although the dividing portion 154 and the extending portion 124 are arranged to face each other, the dividing portion 154 and the extending portion 124 are arranged back to back, that is, the two bobbins 122 are arranged between the two dividing portions 154 and the extending portion 124 . may be arranged so that

The present disclosure is useful for relatively thin speaker devices.

100 speaker device 110 magnetic circuit 112 magnet 113 top plate 114 yoke 115 sub magnet 120 voice coil body 121 coil 122 bobbin 123 signal line 124 extension 125 tongue 130 diaphragm 131 edge 132 cap 134 gasket 140 frame 142 wiring hole 143 Accommodating portion 144 Base portion 145 First working hole 146 Second working hole 149 Mounting hole 150 Damper 154 Separating portion 161 Connecting member 162 Positive input terminal 163 Negative input terminal 170 External wiring 201 First virtual surface 202 Second virtual surface

Claims (3)

two magnetic circuits with a magnetic gap;
two voice coil bodies inserted into the magnetic gap;
a diaphragm coupled to the two voice coil bodies;
A frame to which the diaphragm is attached,
The two coils of each of the voice coil bodies are connected in series and connected to a set of input terminals for inputting audio signals provided between the two voice coil bodies ,
The two voice coil bodies each have an extension portion from which a signal line extends,
The two voice coil bodies are arranged so that the extending portions face each other,
comprising an annular damper that bridges the voice coil body and the frame;
The damper includes a dividing portion that divides a portion of the ring shape in the circumferential direction at a position corresponding to the extending portion.
speaker device. 2. The speaker device according to claim 1, wherein the winding directions of the two coils are the same. 3. The speaker device according to claim 1, wherein the magnetization directions of the two magnetic circuits are the same.

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