JP2008124806A - Speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent adhesives from entering mainly the side of a through hole of a center pole in installation of a damper to a central pole (pole) through adhesives in a speaker system having a damper inside a voice coil bobbin (bobbin). <P>SOLUTION: The speaker device includes a magnetic circuit having a yoke including the pole, the damper and an oscillating body including the bobbin. The damper is provided with a first disc-like material and a second cylindrical material, wherein the first material includes a movable part that elastically supports the bobbin. The outer circumferential surface of the movable part is installed in the inner peripheral surface of the bobbin. The second member of the damper is attached to a recessed groove formed from the inner part on the upper edge of the pole to the outer part using the adhesives. Thus, when the damper is attached to the pole, the adhesives spread in the groove stays in the groove. Thus, the adhesives are prevented from entering the through hole of the pole, simultaneously prevented from overflowing to the side of the movable part to contribute to improvement of sound quality. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a damper mounting structure for a yoke in a speaker device.

  In general, a damper for a speaker device is used in a state of being disposed between a cylindrical voice coil bobbin around which a voice coil is wound and a frame provided so as to surround the voice coil bobbin. Such a damper has a role of elastically supporting the voice coil bobbin while arranging the voice coil at an appropriate position in the magnetic gap.

  Also, a speaker device is known in which a damper is not disposed outside the voice coil bobbin, but is disposed inside the voice coil bobbin (see, for example, Patent Document 1).

  In the speaker device described in Patent Document 1, the damper has an inner peripheral end fixed to the magnetic circuit, and an outer peripheral end joined to the outer peripheral end of the dome portion of the dome diaphragm and the cylindrical inner surface of the voice coil bobbin. Thus, the overall height of the speaker device can be kept low, and at the same time, it is excellent in frequency characteristics and input resistance characteristics, and it is said that there is no speaker failure such as abnormal noise occurring at the time of large input.

  Patent Document 2 also describes a speaker device having a damper that supports the inner surface of a voice coil bobbin and can position the voice coil at an appropriate position in the magnetic gap.

  In the speaker device described in Patent Document 2, a ring-shaped damper (referred to as a damper member in Patent Document 2) has a columnar support portion concentric with the center O of the center pole of the yoke. The columnar support portion is placed on the top of the center pole. The top of the center pole is formed in a concave cross-sectional shape. Thereby, it is said that the balance of the upper and lower amplitudes of the voice coil can be kept appropriate, and a sound without distortion can be obtained.

  Patent Document 3 describes a speaker device including an upper plate having an uneven surface structure that diffuses sound waves so as to reflect sound waves generated from a diaphragm.

  Patent Document 4 describes a magnetic circuit for a speaker device in which a cylindrical concave portion is formed at a substantially central portion of a tip surface of a center pole of a bottom yoke. With such a structure, the magnetic flux is concentrated on the peripheral portion in the center pole, and the magnetic flux density in the magnetic gap can be increased.

  Patent Document 5 describes a speaker device that can stably fix a magnetic circuit on a mounting portion of a resin frame. This magnetic circuit has a pole piece having a substantially inverted T-shaped cross section, and a center pole formed at the center of the pole piece has an upper end portion having a concave cross section. A support member that supports a speaker unit for high-pitched sound reproduction is attached to the upper end portion of the center pole.

JP 2004-221691 A JP 2006-238077 A Japanese Patent Laid-Open No. 2003-33689 Japanese Patent No. 3631389 JP 2005-277866 A

  Here, among the speaker devices having a structure in which the damper is arranged in the space defined by the voice coil bobbin, in particular, in the speaker device described in Patent Document 2 described above, the voice coil bobbin is disposed near the outer periphery of the center pole. A cylindrical support portion of the damper extending toward the end is arranged. For this reason, when attaching the cylindrical support part of the damper to the top of the center pole having a concave cross-sectional shape using an adhesive, the adhesive is located outside the cylindrical support part, and the outer periphery of the center pole Further, when the adhesive is cured in this state and the adhesive is cured in this state, the cured adhesive may interfere with the movement of the damper, which may adversely affect sound quality.

  Further, in this speaker device, since the inner peripheral portion of the upper end portion of the center pole does not have a shape protruding in the sound radiation direction, when attaching the cylindrical support portion of the damper to the upper end portion of the center pole using an adhesive The adhesive sometimes enters a cylindrical opening provided in the center of the center pole. For example, by using this speaker device as a speaker device for high sound reproduction such as a tweeter, and by attaching another speaker device (a speaker device for low sound reproduction such as a woofer) to the cylindrical opening via a connecting member When a coaxial speaker is configured, the connecting member cannot be attached to the columnar opening, which may prevent the coaxial speaker from being configured.

  Examples of problems to be solved by the present invention include the above. The present invention relates to a speaker device having a structure in which a damper is arranged inside a voice coil bobbin, and using an adhesive as the damper, the upper end surface of the center pole located in the sound radiation direction (the upper end portion has a diaphragm side To prevent the adhesive from protruding to the part of the damper that elastically supports the voice coil bobbin, and the adhesive enters the opening at the center of the center pole. It is an object to prevent this.

The invention according to claim 1 is a speaker device, comprising a magnetic circuit having a yoke, and a vibrating body having a voice coil bobbin and a damper, the yoke having a columnar center pole for supporting the damper; A through hole formed in the center pole,
The voice coil bobbin is disposed so as to surround the center pole, and the damper is a plate-shaped first member and a columnar shape provided so as to protrude from the first member toward the opposite side to the acoustic radiation direction. A first member of the damper having a movable part that elastically supports the voice coil bobbin, and an outer peripheral surface of the movable part is attached to an inner peripheral surface of the voice coil bobbin. The second member of the damper is attached to a concave groove formed from the inner periphery to the outer periphery of the center pole.

In one embodiment of the present invention, a speaker device includes a magnetic circuit having a yoke, a vibrating body having a voice coil bobbin and a damper, the yoke having a columnar center pole that supports the damper, and the center. A through hole formed in the pole,
The voice coil bobbin is disposed so as to surround the center pole, and the damper is a plate-shaped first member and a columnar shape provided so as to protrude from the first member toward the opposite side to the acoustic radiation direction. A first member of the damper having a movable part that elastically supports the voice coil bobbin, and an outer peripheral surface of the movable part is attached to an inner peripheral surface of the voice coil bobbin. The second member of the damper is attached to a concave groove formed from the inner periphery to the outer periphery of the center pole.

  The speaker device includes a magnetic circuit having a yoke, and a vibrating body having a voice coil bobbin and a damper. The yoke has a columnar center pole that supports the damper, and a through hole formed in the center pole. The voice coil bobbin is disposed so as to surround the center pole. The damper includes a plate-like first member and a columnar second member provided so as to protrude from the first member toward the opposite side to the acoustic radiation direction. The first member of the damper has a movable portion that elastically supports the voice coil bobbin, and the outer peripheral surface of the movable portion is attached to the inner peripheral surface of the voice coil bobbin. In a preferred example, the second member of the damper forms a predetermined gap between the first member and the center pole facing the first member, and the movable portion is in the acoustic radiation direction. And moving in the direction opposite to the acoustic radiation direction.

  In this speaker device, in particular, the second member of the damper is attached to a concave groove formed from the inner periphery to the outer periphery of the center pole.

  As a result, when the damper is attached to the center pole using an adhesive, the adhesive applied in the groove remains in the groove, so that the adhesive can be prevented from entering the through hole of the center pole. .

  In a preferred example, it is preferable that another speaker device is attached via a connecting member inserted into the through hole of the center pole. As a result, this speaker device is used as a speaker device for high sound reproduction, and another speaker device (for example, a speaker device for low sound reproduction) is attached to the through hole via a connecting member to constitute a coaxial speaker. Even in this case, since the adhesive is inhibited by the inner peripheral portion having a protruding shape and does not enter the through hole, the connecting member can be securely attached to the through hole, and the coaxial The speaker can be configured reliably.

  In addition, with the above configuration, when the damper is attached to the center pole using an adhesive, the adhesive applied in the groove remains in the groove, so that the adhesive is positioned on the movable part side of the damper. It is possible to prevent the center pole from protruding to the outer peripheral side. That is, when the adhesive protrudes on the outer peripheral side of the center pole, the movable part of the damper and the center pole are bonded, and it becomes difficult for the movable part to move according to the movement of the diaphragm. Can be eliminated. In a preferred example, the damper is preferably integrally formed. Here, when the damper is formed of a plurality of members, for example, when the first member and the second member are formed as separate members and then joined using an adhesive or the like, the movable portion is Since the first member having the movable member moves together with the voice coil bobbin, it is possible to eliminate the problem that stress is applied to the joined portion and the joining force is lowered and peeled off with time, that is, the reliability of the speaker device is lowered. it can. Therefore, when the speaker device is driven, the movable part of the damper can be appropriately moved without being hindered by the adhesive, and adverse effects on the sound quality can be prevented. Moreover, since all the lower end parts of the outer peripheral surface of the 2nd member of a damper are fixed by the adhesive agent apply | coated in the said groove | channel by this structure, the 2nd member of a damper with respect to the end surface of a center pole The bonding force can be improved.

  In another aspect of the above speaker device, the second member of the damper is attached in the vicinity of the through hole. Thereby, the length of the movable part of a damper in the direction orthogonal to the acoustic radiation direction becomes long. Therefore, since the movable range of the movable part of the damper relative to the central axis direction of the speaker device (and hence the movable range of the voice coil bobbin) can be increased, the diaphragm can be moved with a large amplitude and the diaphragm can be vibrated with a large amplitude. Sound can be played at a high volume, which can contribute to improvement of sound quality. In addition, with this configuration, when the damper is attached to the center pole using an adhesive, the adhesive is more difficult to protrude to the inner peripheral side of the center pole, and the adhesive force with the center pole can be further increased. . Therefore, the damper, particularly the second member of the damper, can be prevented from peeling from the center pole from the center pole, so that the amplitude of the diaphragm can be increased, and the diaphragm can be vibrated with a large amplitude to reproduce sound at a large volume. This can contribute to the improvement of the reliability of the speaker device.

  Various preferred embodiments of the present invention will be described below with reference to the drawings.

[Configuration of speaker device]
FIG. 1 is a cross-sectional view of a speaker device 100 according to an embodiment of the present invention cut at a position passing through the central axis L1.

  The speaker device 100 mainly includes an inner magnet type magnetic circuit 30 having a yoke 1, a magnet 2, and a plate 3, a voice coil bobbin 4, a voice coil 5, a damper 6, and a diaphragm 7. It is configured to include the vibrating body 31, the frame 8, and other elements. Here, the other elements include the sound absorbing material 9, the capacitor 10, and the like.

(Configuration of magnetic circuit)
The configuration of the magnetic circuit 30 is as follows.

  The yoke 1 has an inverted T-shaped cross section, a columnar center pole 11 that supports a damper 6 described later, a flange portion 12 that extends outward from the lower end of the outer peripheral surface of the center pole 11, Have The center pole 11 has a through hole 11h that penetrates in the acoustic radiation direction Y1. For example, when a coaxial speaker is configured by using the speaker device 100 as a speaker device for high sound reproduction such as a tweeter and further using another speaker device as a speaker device for low sound reproduction such as a woofer, the through hole The other speaker device is attached to the (for example, screw hole) 11h via a connecting member (for example, a bolt or the like; not shown). The magnet 2 has an annular shape and is mounted on the flange portion 12 of the yoke 1. The plate 3 has an annular shape and is mounted on the magnet 2. A magnetic gap 32 in which the magnetic flux of the magnet 2 concentrates is formed between the inner peripheral surface of the plate 3 and the outer peripheral surface of the upper end portion of the yoke 1.

(Frame structure)
The frame 8 has an annular shape. The frame 8 is attached on the plate 3 and has a role of supporting the vibrating body 31.

(Structure of vibrating body)
The configuration of the vibrating body 31 is as follows.

  The voice coil bobbin 4 has a cylindrical shape and is disposed so as to surround the center pole 11.

  The voice coil 5 is wound around the outer peripheral surface of the lower end portion of the voice coil bobbin 4 and is located in the magnetic gap 32. The voice coil 5 has a pair of plus / minus lead wires (not shown). The positive lead wire is an input wiring for an L (or R) channel signal, and the negative lead wire is an input wiring for a ground (GND) signal. The pair of plus / minus lead wires are electrically connected to the amplifier side (not shown).

  In a preferred example, the damper 6 is formed of a resin material or a rubber material, and is attached to the center pole 11 of the yoke 1. The lower end portion of the damper 6 is attached to the upper end surface of the center pole 11, and the outer peripheral portion of the damper 6 is attached to the inner peripheral surface of the voice coil bobbin 4. For this reason, the damper 6 has a role of elastically supporting the vibrating body 31 including the voice coil bobbin 4 in the direction of the central axis L1. On the upper end surface 61b of the damper 6, a sound absorbing material 9 made of a material having air permeability is provided. The detailed configuration of the damper 6 will be described later.

  The diaphragm 7 has a dome-like shape, a sound emitting part 7a having a function of emitting sound waves in the sound radiation direction Y1, and a semicircular shape provided so as to be continuous from the outer periphery of the sound emitting part 7a. And an edge 7b having the following cross-sectional shape. The outer peripheral portion of the sound emitting portion 7 a is attached to the outer peripheral surface of the upper end portion of the voice coil bobbin 4, and the outer peripheral portion of the edge 7 b is attached to the upper end portion of the frame 8.

  In the speaker device 100 having the above configuration, the audio current output from the amplifier side is input to the voice coil 5 through the pair of plus / minus lead wires of the voice coil 5. As a result, a driving force is generated in the voice coil 5 within the magnetic gap 32 based on Fleming's left-hand rule, and a sound wave is radiated in the acoustic radiation direction Y 1 through the sound emitting portion 7 a of the diaphragm 7.

[Damper mounting structure for yoke]
Next, with reference to FIGS. 2 and 3, a structure for attaching the damper 6 to the yoke 1 will be described.

  Fig.2 (a) shows the top view of the damper 6 which concerns on a present Example when it sees from the acoustic radiation direction Y1 in FIG. FIG. 2B shows a sectional view through the central axis L1 of the damper 6 along the cutting line A-A ′ of FIG. FIG. 3 is an enlarged cross-sectional view of a main part in which the broken line area E1 of FIG. 1 is enlarged, and particularly shows a mounting structure of the damper 6 to the yoke 1.

  First, a characteristic configuration of the yoke 1 according to the present embodiment will be described.

  The basic configuration of the yoke 1 is as described above. In the present embodiment, the upper end surface (one end surface) 11a of the center pole 11 located in the acoustic radiation direction Y1 is formed with a concave groove 11d (one point in FIG. 3) extending from the inner peripheral portion 11b to the outer peripheral portion 11c of the center pole 11. A portion surrounded by a chain line) is formed. That is, the inner peripheral portion 11b and the outer peripheral portion 11c of the one end surface 11a of the center pole 11 are formed in a shape protruding from the one end surface 11a of the center pole 11 in the acoustic radiation direction Y1. An adhesive (not shown) is applied in the groove 11d, and the one end surface 11a of the center pole 11 and a second member 62 of the damper 6 described later are joined using the adhesive.

  Next, a characteristic configuration of the damper 6 according to the present embodiment will be described.

  The basic configuration of the damper 6 is as described above. In the present embodiment, the damper 6 includes a disk-shaped first member 61 (a region surrounded by a broken line in FIG. 2B) and a cylinder provided so as to protrude from one end surface 61 a of the first member 61. Second member 62 (a region surrounded by a two-dot chain line in FIG. 2B).

  The first member 61 includes a movable portion 61m (a region surrounded by a one-dot chain line in FIG. 2B) having a function of elastically supporting the voice coil bobbin 4. The length d1 of the movable portion 61m in the direction orthogonal to the central axis L1 of the damper 6 is used to maximize the function of the movable portion 61m, that is, when the voice coil bobbin 4 is moved with a large amplitude. It is preferable that the length of the movable part 61m 6 is sufficiently long so that the movement of the voice coil bobbin 4 is not hindered. In addition, an opening 61h penetrating in the direction of the central axis L1 is formed in the central portion and the movable portion 61m of the first member 61, respectively.

  As shown in FIG. 3, the second member 62 has a length d <b> 10 that forms a predetermined gap between one end surface 61 a of the first member 61 and one end surface 11 a of the center pole 11 facing the first member 61. And a length d10 that enables the movable portion 61m to move in the direction of the arrow Y2.

  Here, in this embodiment, the damper 6 is attached to the center pole 11 as follows. First, an adhesive (not shown) is applied in a groove 11d (one end surface 11a of the center pole 11) formed between the inner peripheral portion 11b and the outer peripheral portion 11c of the center pole 11. Subsequently, the second member 62 of the damper 6 is attached to the one end surface 11 a of the center pole 11 through the adhesive.

  In such a state, the damper 6 is arranged inside the voice coil bobbin 4 so that the second member 62 protrudes toward the opposite side to the acoustic radiation direction Y1. And the outer peripheral surface of the movable part 61m of the 1st member 61 is attached to the internal peripheral surface of the voice coil bobbin 4, as shown in FIG. 3, and the 2nd member 62 is in the vicinity of the through-hole 11h of the center pole 11. And it is attached using the adhesive agent in the groove | channel 11d (end surface 11a of the center pole 11) formed between the inner peripheral part 11b and the outer peripheral part 11c. As a result, when the speaker device 100 is driven, the damper 6 vibrates the movable portion 61m in the direction of the arrow Y2 with reference to the position P (see FIG. 3) of the joint portion between the movable portion 61m and the second member 62. It has a role of elastically supporting the voice coil bobbin 4 and the like in the direction of the central axis L1.

  Next, advantages of the damper mounting structure for the yoke according to the present embodiment compared to the comparative example will be described. In the description of the comparative example, the same reference numerals are assigned to the same elements as in the present embodiment, and the description thereof is omitted.

  FIG. 4 shows a damper mounting structure for a yoke according to a comparative example corresponding to FIG.

  When the comparative example and the present embodiment are compared, both of them are the shape of the upper end surface (one end surface) 11a of the center pole 11 in the yoke 1, the shape of the damper, and the upper end surface (one end surface) 11a of the center pole 11. The mounting position of the second member 62 of the damper is slightly different from each other.

  That is, first, when attention is paid to the one end surface 11a of the center pole 11 according to the comparative example, the inner peripheral portion of the one end surface 11a is different from the present embodiment in that it does not have a protruding shape. Further, when attention is paid to the second member 62 of the damper 6x according to the comparative example, the length d2 of the movable portion 61m of the damper 6x in the direction orthogonal to the central axis L1 of the damper 6x is very short. Different. Here, when the length d1 of the movable part 61m of the present embodiment is compared with the length d2 of the movable part 61m according to the comparative example, the relationship between the lengths of the two is d1> d2. Further, in the comparative example, since the damper 6x having such a configuration is provided, the second member 62 of the damper 6x is in the vicinity of the outer peripheral portion 11c having a protruding shape on the one end surface 11a of the center pole 11, and It is attached to the one end surface 11a of the center pole 11 located below the outer peripheral portion 11c using an adhesive.

  In the comparative example having such a configuration, when the damper 6x is attached to the center pole 11, an adhesive (not shown) is applied to one end surface 11a of the center pole 11 located below the outer peripheral portion 11c, and the adhesion is performed. The second member 62 of the damper 6x is attached to the one end surface 11a of the center pole 11 through the agent.

  Here, in the comparative example, the second member 62 of the damper 6x is attached in the vicinity of the outer peripheral portion 11c of the one end face 11a of the center pole 11, and at this time, the adhesive is the damper 6x as shown by an arrow Y3. It is easy to protrude to the movable part 61m side. Should the adhesive harden in a state where it protrudes to the movable part 61m side of the damper 6x, the hardened adhesive prevents the movable part 61m of the damper 6x from moving in the direction of the arrow Y2. May adversely affect sound quality.

  In the comparative example, since the inner peripheral portion of the one end surface 11a of the center pole 11 does not have a protruding shape, the adhesive flows in the direction of the arrow Y4 and enters the through hole 11h of the center pole 11 at this time. It may be. Here, the speaker device according to the comparative example is used as a speaker device for high sound reproduction such as a tweeter, and further, another speaker device (for example, a speaker for low sound reproduction such as a woofer) is connected to the through hole 11h via a connecting member. When a coaxial speaker is configured by attaching a device or the like, the connecting member cannot be attached to the through-hole 11h due to the adhesive that has entered the through-hole 11h, and the coaxial speaker is configured. There is a possibility that it cannot be done.

  In this regard, in this embodiment, the second member 62 of the damper 6 is attached to the concave groove 11d formed from the inner peripheral portion 11b to the outer peripheral portion 11c of the one end surface 11a of the center pole 11 using an adhesive. Yes.

  As a result, when the damper 6 is attached to the center pole 11 using an adhesive, the adhesive applied in the groove 11d remains in the groove 11d, so that the adhesive passes through the through-hole 11h of the center pole 11. Can be prevented from entering.

  Therefore, the speaker device 100 according to this embodiment is used as a speaker device for high sound reproduction such as a tweeter, and another speaker device (a speaker device for low sound reproduction such as a woofer) is connected to the through hole 11h via a connecting member. Even when the coaxial speaker is mounted, the adhesive is not obstructed by the inner peripheral portion 11b having a protruding shape and does not enter the through hole 11h. A connecting member can be attached reliably and a coaxial speaker can be constituted reliably.

  In addition, with the above configuration, when the damper 6 is attached to the center pole 11 through the adhesive, the adhesive applied in the groove 11d remains in the groove 11d. It can prevent protruding to the outer peripheral part 11c side of the center pole 11 located in the movable part 61m side. That is, when the adhesive protrudes from the outer peripheral side of the center pole 11, the movable part 61 m of the damper 6 and the center pole 11 are bonded, and the movable part 61 m can move according to the movement of the diaphragm 7. The problem of becoming difficult can be solved. The damper 6 may be integrally formed. When the damper 6 is formed of a plurality of members, for example, when the first member 61 and the second member 62 are formed as separate members and then joined using an adhesive or the like, the movable portion 61m Since the first member 61 having the movable member moves together with the voice coil bobbin 4, stress is applied to the joined portion, and the joining force is lowered and peeled off over time, that is, the reliability of the speaker device 100 is lowered. Can be resolved.

  Therefore, when the speaker device 100 is driven, the movable portion 61m of the damper 6 can be appropriately moved in the direction of the arrow Y2 without being hindered by the adhesive, and adverse effects on sound quality can be prevented.

  Further, with this configuration, all of the lower end portions of the outer peripheral surface of the second member 62 of the damper 6 are fixed by the adhesive applied in the groove 11d between the inner peripheral portion 11b and the outer peripheral portion 11c. Therefore, as compared with the comparative example, the bonding force of the second member 62 of the damper 6 to the one end surface 11a of the center pole 11 can be further improved. Here, in the comparative example, as shown in FIG. 4, the one end surface 11a of the center pole 11 does not have a concave groove from the inner peripheral portion to the outer peripheral portion 11c, and therefore, the damper 6x located on the through hole 11h side. The bonding force through the adhesive between the lower end of the outer peripheral surface and the one end surface 11a of the center pole 11 is weaker than that of the present embodiment due to its structure, and the damper 6x may be peeled off from the center pole 11. As a result, the reliability of the speaker device is impaired.

  In the present embodiment, the second member 62 of the damper 6 is located in the groove 11d (center pole 11) formed near the through hole 11h of the center pole 11 and between the inner peripheral portion 11b and the outer peripheral portion 11c. Is attached to one end face 11a) of the adhesive via an adhesive. Thereby, since the length d1 of the movable part 61m of the damper 6 is increased, the movable range of the movable part 61m of the damper 6 with respect to the direction of the central axis L1 (and hence the movable range of the voice coil bobbin 4) can be increased. Can be moved with a large amplitude, and the diaphragm 7 can be vibrated with a large amplitude to reproduce a sound with a large volume, which can contribute to an improvement in sound quality. Also, with this configuration, when the damper 6 is attached to the center pole 11 using an adhesive, the adhesive becomes more difficult to protrude to the inner peripheral portion 11b side of the center pole 11, and further, with the center pole 11 Adhesion can be increased. Therefore, the damper 6, particularly the second member 62 of the damper 6, can be prevented from peeling off from the center pole 11 from the center pole 11, so that the amplitude of the diaphragm 7 can be increased, and the diaphragm 7 can be vibrated with a large amplitude. Can reproduce sound, and can contribute to the improvement of the reliability of the speaker device.

  Further, in this embodiment, as shown in FIGS. 1 and 2, the cross-sectional shape of the end portion of the movable portion 61 m of the damper 6 is formed in a convex shape toward the voice coil bobbin 4. With this shape, a liquid pool portion is formed when the adhesive is applied toward the acoustic radiation direction Y1, and the voice coil bobbin 4 and the damper 6 can be joined more firmly.

  In this embodiment, a circular speaker device is described. However, for example, an elliptical speaker device may be used, and the shape of the speaker device is not limited.

Sectional drawing of the speaker apparatus which concerns on the Example of this invention. The top view and sectional view of the damper concerning the example of the present invention. Sectional drawing which shows the attachment structure of the damper with respect to the yoke which concerns on a present Example. Sectional drawing which shows the attachment structure of the damper with respect to the yoke which concerns on a comparative example.

Explanation of symbols

1 Yoke 4 Voice coil bobbin 6 Damper 11 Center pole 11a Upper end surface (one end surface)
11b Inner peripheral part 11c Outer peripheral part 11d Groove 11h Through-hole 61 First member 61a One end surface 61m Movable part 62 Second member 30 Magnetic circuit 31 Vibrating body 100 Speaker device

Claims (5)

A magnetic circuit having a yoke, and a vibrating body having a voice coil bobbin and a damper,
The yoke has a columnar center pole that supports the damper, and a through-hole formed in the center pole,
The voice coil bobbin is disposed so as to surround the center pole,
The damper includes a plate-shaped first member, and a columnar second member provided so as to protrude from the first member toward the opposite side to the acoustic radiation direction,
The first member of the damper has a movable part that elastically supports the voice coil bobbin, and an outer peripheral surface of the movable part is attached to an inner peripheral surface of the voice coil bobbin, and the second member of the damper Is attached to a concave groove formed from the inner periphery to the outer periphery of the center pole.   The speaker device according to claim 1, wherein the second member of the damper is attached in the vicinity of the through hole.   The second member of the damper forms a predetermined gap between the first member and the center pole facing the first member, and the movable portion has the acoustic radiation direction and the acoustic radiation direction. The speaker device according to claim 1, wherein the speaker device can be moved in the opposite direction.   4. The speaker device according to claim 1, wherein another speaker device is attached via a connecting member inserted into the through hole of the center pole. 5.   The speaker device according to claim 1, wherein the damper is integrally formed.

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