JP6554519B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device.

  A speaker disclosed in Patent Document 1 has been proposed as a speaker device that prevents an abnormal sound generated by iron powder or magnetic powder entering the magnetic gap. The speaker of Patent Document 1 has a through hole penetrating the magnetic circuit at the center of the bottom surface of the magnetic circuit of the speaker, and iron powder and magnetic powder pass through the center hole provided in the frame and enter the through hole of the yoke To do. As a result, abnormal noise generated by iron powder or magnetic powder entering the magnetic gap is prevented.

  However, in a place with a lot of sand, the above-described measures against sand dust are not sufficient, and sand dust may intrude from the air hole of the yoke into the magnetic gap to cause drive failure.

JP-A-2005-57640

  The present invention takes as an example the problem to address such problems. That is, an object of the present invention is to provide, for example, a speaker device that suppresses dust from entering a magnetic gap.

In order to solve the above problems, the invention described in claim 1 is a case having a peripheral portion and a bottom portion, a magnetic circuit located at the bottom portion of the case, a connecting portion to which the magnetic circuit is connected, and the case And a frame having a hole opening toward the outer peripheral portion, and a gap is located between the outer peripheral portion and the outer peripheral portion, and the hole is recessed toward the sound radiation side outside the connection portion. The speaker device is characterized in that it is located in the recessed portion .

It is a cross-sectional perspective view which shows the speaker apparatus of this invention in 1st Example. It is a fragmentary sectional view which shows the speaker apparatus of this invention in 2nd Example. It is a perspective view of the flame | frame which comprises the speaker apparatus shown in FIG.

  Hereinafter, a speaker device according to an embodiment of the present invention will be described. A speaker device according to an embodiment of the present invention includes a magnetic circuit, a frame, and a case, and the frame is outside the connecting portion to which the magnetic circuit is connected and the connecting portion, and the case is A case having a hole opening toward the frame, the case opening toward the frame covers the magnetic circuit and the frame, and an edge portion of the case outside the hole and on the acoustic radiation side; It is a speaker device characterized in that a gap is formed between the frame and the frame.

  Thereby, the invading route of sand dust (especially sand iron) to the magnetic gap proceeds from the gap on the acoustic radiation side from the hole of the frame toward the opposite direction to the sound radiation direction, and then changes the direction. It becomes a path that proceeds toward the radial direction, passes through the hole of the frame, enters the frame, and reaches the magnetic gap. Since it is necessary for sand dust to travel from the gap on the acoustic radiation side of the hole of the frame toward the direction opposite to the sound radiation direction, it is difficult for sand dust to penetrate into the frame, and sand dust can be suppressed from entering the magnetic gap. . In addition, sand dust (especially sand iron) intruding from the gap adheres to the magnetic circuit connected to the frame by magnetic force, so it is further difficult to intrude into the frame, and the invasion of sand dust into the magnetic gap can be suppressed.

  In addition, a chair coil and a damper for supporting the voice coil on the frame are provided, and the damper is attached to the inner surface of the outer periphery of the frame, and a part of the outer periphery of the frame is on the magnetic circuit side from the damper It may be a continuous surface. As a result, it is possible to limit the ingress port of sand dust into the frame on the magnetic circuit side of the damper only to the hole portion, and it is possible to further suppress sand dust (especially sand iron) in the magnetic gap.

  The hole may be formed in the bottom of the frame, and the gap may be formed between the outer periphery of the frame and the outer periphery of the case. Since the hole formed at the bottom of the frame is open toward the frame or the magnetic circuit, if dust does not advance from the gap on the acoustic radiation side in the direction opposite to the sound radiation direction, the dust is removed from the hole. Cannot enter the frame. Thereby, the penetration | invasion of the dust (especially sand iron) to a magnetic gap can be suppressed further.

  In addition, the outer surface of the outer peripheral portion of the frame may have an inclined surface which approaches the case as it goes to the acoustic radiation side, and the edge of the case may be opposed to the inclined surface of the frame. As a result, the gap on the opening side of the case can be narrowed to make it difficult to infiltrate sand dust, and intrusion of sand dust into the case can be suppressed and intrusion of sand dust into the magnetic gap can be suppressed.

  Also, with the aforementioned gap as the first gap, the second gap is formed between the outer periphery of the case and the magnetic circuit, and the first gap and the second gap are formed continuously from the edge to the bottom of the case May be. Thus, as one of the sand and dust intrusion paths, a path is formed where sand and dust that has entered from the opening of the case penetrates to the bottom of the case away from the hole. Since the dust that has entered along this path enters the bottom, it can be prevented from being sucked toward the hole of the frame.

  The magnetic circuit may be an external magnet type magnetic circuit having a yoke, a magnet and a plate, and the outer periphery of the magnet of the magnetic circuit may protrude toward the case from the outer periphery of the yoke and the outer periphery of the plate. As a result, since the middle portion of the second gap is narrowed, sand dust which has entered from the opening of the case and passed through the middle portion of the second gap to the bottom of the case is sucked toward the hole of the frame. It can be further suppressed.

  In addition, a part of the second gap located closer to the bottom of the case than the magnet may be formed wider than a part of the second gap at the position where the magnet is located. With this magnet, the middle portion of the second gap is narrow, and a part of the second gap on the bottom side of the middle portion can be formed wide and penetrates from the opening of the case and passes through the middle portion of the second gap to the bottom of the case It can suppress further that the dust which penetrate | invaded is sucked toward the hole of a flame | frame. Moreover, it can be set as the accommodating part which accommodates the dust which penetrate | invades by forming a part of 2nd clearance gap in the bottom part side of a case widely.

(First embodiment)
Next, the speaker device in the first embodiment will be described with reference to FIG.

  As shown in the figure, the speaker device 1 includes a magnetic circuit 2 in which a magnetic gap G is formed, a frame 3 to which the magnetic circuit 2 is connected, a voice coil 4 inserted in the magnetic gap G, and a voice coil. A coil bobbin (voice coil support portion) 5 for supporting the coil 4, a damper 6 for vibrating the coil bobbin 5 in a vibrating manner, a diaphragm and a cap (all not shown), and a case 7 are provided.

  The magnetic circuit 2 in the present embodiment is an external magnet type magnetic circuit, and is a yoke in which the magnet 21, the plate 22 to which one pole of the magnet 21 is magnetically coupled, and the other pole of the magnet 21 are magnetically coupled. And a mesh 24.

  The magnet 21 is provided in a disk shape, and a through hole 21 a is provided at the center.

  The plate 22 is provided in a disk shape, is overlaid on the surface of the magnet 21 on the sound emission direction Y1 side (= one pole side), and is fixed by an adhesive or the like. A through hole 22a is provided at the center of the plate 22 as well.

  The yoke 23 is formed with a cylindrical yoke main body 23a inserted into the magnet 21 and the through holes 21a and 22a of the plate 22, and a flange portion 23b protruding outward from the yoke main body 23a. . A magnetic gap G is formed between the inner peripheral surface of the through hole 22a of the plate 22 and the yoke body 23a inserted into the through hole 22a. The magnetic gap G is opened at the sound radiation direction Y1 side and the opposite direction Y2 side.

  The flange portion 23b is erected in the sound radiation direction Y1 from the inner peripheral portion 23b1 protruding outward from the end on the reverse direction Y2 side of the yoke main body 23a and the outer end of the inner peripheral portion 23b1; Inclined part 23b2 which is separated from yoke main body 23a as it goes in sound radiation direction Y1, and formed to project outward from the end on the sound radiation direction Y1 side of inclined part 23b2 (that is, formed parallel to inner circumferential part 23b1 And an outer peripheral portion 23b3. The inner circumferential portion 23b1 is mounted on the bottom 71 of the case 7 described later, and the inclined portion 23b2 and the outer circumferential portion 23b3 are provided separately from the case 7 described later. On the outer peripheral portion 23b3, a surface on the reverse direction Y2 side (= other pole side) of the magnet 21 is overlapped and fixed with an adhesive or the like.

  The mesh 24 is attached to the end of the yoke body 23a on the sound emission direction Y1 side, and prevents dust from entering the frame 3. The outer diameter (or width) of the magnet 21 is larger than the outer diameter (or width) of the plate 22 or the outer diameter (or width) of the flange portion 23 b of the yoke 23. For this reason, the magnet 21 protrudes to the case 7 side described later than the plate 22 and the yoke 23.

  The frame 3 is made of a resin such as polyethylene, polypropylene or ABS, and has a bottom 31 and an outer periphery 32 erected from the edge of the bottom 31 in the sound radiation direction Y1.

  The bottom 31 of the frame 3 is circular, and has a through hole 31a formed in the center, a plurality of connection holes 31b surrounding the through hole 31a, and a plurality of holes 31c further formed outside the connection hole 31b. And are provided. The yoke main body 23a and the coil support 5 described later are inserted into the through holes 31a. For this reason, the opening of the magnetic gap G communicates with a through hole 31 a provided in the bottom 31 of the frame 3. Therefore, when sand dust intrudes into the frame 3, the sand dust may intrude into the magnetic gap G through the through holes 31 a provided in the bottom portion 31.

  The connection hole 31 b is a hole for connecting the magnetic circuit 2 to the frame 3, and the projection 22 b protruding from the plate 22 is inserted into the connection hole 31 b. The magnetic circuit 2 is connected to the frame 3 by crushing the head of the projection 22 b. In the bottom portion 31 of the frame 3, a portion in contact with the plate 22 (magnetic circuit 2) is a connection portion. The plurality of holes 31 c are formed outside the connecting portion of the bottom 31 of the frame 3 and open toward the magnetic circuit 2. Air is fed into the magnetic circuit 2 from the plurality of holes 31 c to cool the magnetic circuit 2.

  The outer peripheral portion 32 of the frame 3 includes a first inclined portion 32a, a damper attachment portion 32b, a second inclined portion 32c, and a diaphragm attachment portion 32d. The first inclined portion 32a is connected to the bottom portion 31 and is provided so that the outer diameter (or width) increases as it goes in the sound radiation direction Y1. Thereby, the inclined surface 32a1 whose outer diameter (or width) becomes larger toward the sound radiation direction Y1 is provided on the outer surface of the first inclined portion 32a. The damper mounting portion 32b is formed so as to protrude outward from the end portion on the sound radiation direction Y1 side of the first inclined portion 32a (that is, formed substantially parallel to the bottom portion 31), and the outer peripheral edge (edge end portion) ) Is attached. The second inclined portion 32c is erected from the outer end of the damper mounting portion 32b in the sound radiation direction Y1, and is provided so that the outer diameter (or width) increases in the sound radiation direction Y1. . The diaphragm attachment portion 32d is formed so as to protrude outward from the end on the sound radiation direction Y1 side of the second inclined portion 32c (that is, formed substantially parallel to the bottom 31), and the outer peripheral edge of the diaphragm (not shown) Edge) is attached.

  A part of the outer peripheral portion 32 of the frame 3 (that is, the first inclined portion 32a), which is closer to the magnetic circuit 2 than the damper 6, is a continuous surface in which no opening is provided. A plurality of openings 32e are provided in a part of the outer peripheral portion 32 of the frame 3 (that is, the second inclined portion 32c) on the side farther from the magnetic circuit 2 than the damper 6 to release the back pressure of the diaphragm not shown. It has been.

  The coil support portion 5 is provided in a tubular shape, and the coil 4 is wound around the outer side surface thereof. The damper 6 is formed in a circular shape by an elastic member, and is formed in a bellows shape from the outside toward the center. A through hole 6a into which the voice coil 4 is inserted is provided at the center of the damper 6, and the coil supporting portion 5 is fixed to the inner side surface of the through hole 6a of the damper 6 by an adhesive or the like. Further, the outer peripheral edge (edge end portion) of the damper 6 is fixed to the inner side surface of the damper mounting portion 32b of the frame 3 with an adhesive or the like.

  A diaphragm (not shown) is formed of a resin such as paper or polyetherimide, and is provided in a circular shape with a through hole formed in the center. The coil supporting portion 5 is fixed to the inner side surface of the through hole of the diaphragm by an adhesive or the like. Further, the outer peripheral edge (edge portion) of the diaphragm is fixed to the inner side surface of the diaphragm mounting portion 32d of the frame 3 with an adhesive or the like. A cap (not shown) is fixed to the diaphragm so as to cover the coil support portion 5 protruding from a through hole provided in the center of the diaphragm (not shown). Thus, when current flows through the coil 4, the magnetic force of the magnetic circuit 2 causes the coil support portion 5 to vibrate, thereby vibrating a diaphragm (not shown) to emit a sound.

  The case 7 is made of a resin such as polyethylene, polypropylene or ABS, covers the magnetic circuit 2 and the frame 3, and is opened toward the frame 3 (in the sound radiation direction Y1). The case 7 has a bottom portion 71 and an outer peripheral portion 72 erected from the peripheral edge (edge end portion) of the bottom portion 71. Here, part or all of the magnetic circuit 2 may be covered by the case 7. In order to prevent sand dust from entering the magnetic circuit 2, the case 7 faces the outer peripheral surface of the magnetic circuit 2 facing the outside, not facing the frame 3 as shown in FIG. Preferably, a part of the magnetic circuit 2 is covered. Further, the case 7 may cover the entire frame 3 or a part of the frame 3 as shown in FIG.

  The bottom 71 is provided with a communication hole 71a on which the magnetic circuit 2 described above is mounted and communicates with the hole of the cylindrical yoke body 23a.

  The outer peripheral portion 72 of the case 7 is erected from the plurality of holes 31 c provided in the frame 3 to the sound radiation side. Further, the edge portion 72c of the outer peripheral portion 72 is on the acoustic radiation side outside the hole 31c. A first gap S <b> 1 is formed between the outer peripheral portion 72 of the case 7 and the outer peripheral portion 32 of the frame 3. The first gap S1 and the opening of the case 7 communicate with each other. Further, a second gap S2 is formed between the outer peripheral portion 72 of the case 7 and the magnetic circuit 2, and the first gap S1 and the second gap S2 are formed continuously from the opening of the case 7 to the bottom portion 71. Yes.

  The outer peripheral portion 72 of the case 7 includes a first inclined portion 72a and a second inclined portion 72b. The first inclined portion 72 a is continuous with the bottom portion 71 and is provided such that the outer diameter (or width) increases as the distance from the bottom portion 71 increases. The second inclined portion 72 b is connected to the first inclined portion 72 a and is provided at an inclination angle larger than the inclination angle between the first inclined portion 72 a and the bottom portion 71. The edge portion of the second inclined portion 72 b faces the inclined surface 32 a 1 of the outer peripheral portion 32 of the frame 3. As a result, the first gap S1 is narrowest on the opening side, which is a sand dust entrance, and becomes wider toward the reverse direction Y1.

  Further, as described above, the magnet 21 is provided so as to protrude outward from the plate 22 and the yoke 23. Thus, the second gap S2 is narrow at the intermediate position (the position between the outer periphery 72 of the case 7 and the magnet 21), and between the bottom 71 side (the outer periphery 72 of the case 7 and the flange 23b of the yoke 23). ) Is widened. Further, the second gap S <b> 2 between the outer peripheral portion 32 of the frame 3 and the flange inclined portion 23 b <b> 2 increases as the bottom portion 71 is approached. A space between the frame 3 and the flange portion 23b of the yoke 23 serves as an accommodating portion 8 that accommodates dust that has entered through the opening of the case 7.

  According to the speaker device 1 configured as described above, it is necessary to provide the hole 31 c in the bottom 31 of the frame 3 in order to cool the magnetic circuit 2. In the present embodiment, the case 7 is provided to cover the magnetic circuit 2 and the frame 3, and the edge 72 c of the outer periphery 72 of the case 7 is erected further to the sound radiation direction Y1 than the plurality of holes 31 c. A first gap S1 is formed between the outer peripheral portion 72 and the outer peripheral portion 32 of the frame 3, and the first gap S1 and the opening of the case 7 communicate with each other.

  Thereby, as an intrusion path of sand dust (especially sand iron) into the magnetic gap G, sand dust travels in the reverse direction Y2 side, enters the first gap S1 from the opening of the case 7, and then changes the direction to emit sound It becomes a path | route which advances toward the direction Y1 and penetrate | invades in the flame | frame 3 from the hole 31c, and penetrate | invades into the magnetic gap G from the flame | frame 3. For this reason, it is difficult for sand dust to enter the frame 3, and entry of dust into the magnetic gap G can be suppressed. Moreover, sand dust (especially sand iron) intruding from the opening of the case 7 adheres to the magnetic circuit 2 connected to the frame 3 and thus is less likely to intrude into the frame 3 and suppresses intrusion of sand dust into the magnetic gap G it can.

  Further, the opening of the frame 3 is closed by the damper 6, a diaphragm (not shown), and a gap, and the outer peripheral portion 32 (that is, the first inclined portion 32a) of the frame 3 closer to the magnetic circuit 2 than the damper 6 is provided with an opening. It is formed of an uninterrupted continuous surface. Thereby, the penetration port of sand dust into the frame 3 on the magnetic circuit 2 side from the damper 6 can be limited to the hole 31 c, and the penetration of sand dust (especially sand iron) into the magnetic gap G can be further suppressed.

  Further, according to the speaker device 1 described above, the edge portion 72 c of the outer peripheral portion 72 of the case 7 faces the inclined surface 32 a 1 of the frame 3. This makes it possible to narrow the first gap S1 on the opening side of the case 7, which is a dust penetration opening, to suppress the intrusion of the sand into the case 7 and to further invade the sand into the magnetic gap G. Can be suppressed.

  Further, according to the speaker device 1 described above, the second gap S2 is formed between the outer peripheral portion 32 of the frame 3 and the magnetic circuit 2, and the first gap S1 and the second gap S2 are formed at the bottom portion 71 of the case 7. It is formed continuously. As a result, the dust that has entered the first gap S1 from the opening of the case 7 proceeds in the reverse direction Y2 as it is, passes through the second gap S2 to the bottom 71, and is collected in the housing portion 8. Thereby, since the sand dust which has entered from the opening of the case 7 penetrates to the bottom 71 of the case 7 separated from the hole 71 c, the sand dust which has invaded to the bottom 71 can be prevented from being sucked toward the hole 31 c of the frame 3 .

  Further, according to the speaker device 1 described above, the magnet 21 of the magnetic circuit 2 protrudes from the plate 22 and the yoke 23 toward the case 7. Accordingly, as described above, the second gap S2 is narrow at the intermediate portion and widely at the bottom portion 71 side. Thus, by providing the middle portion of the second gap S2 narrowly, it enters from the opening of the case 7, passes through the middle portion of the second gap S2 to the bottom portion 71 of the case 7, and is stored in the housing portion 8. It is possible to further suppress the dust from being sucked again toward the hole 31c of the frame 3 through the intermediate portion of the narrow second gap S2.

Second Embodiment
Next, the speaker device 1 in the second embodiment will be described with reference to FIGS. 2 and 3, parts that are the same as those of the speaker device 1 shown in FIG. 1 already described in the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted. The difference between the first embodiment and the second embodiment is the shape of the frame 3. In the first embodiment, the outer diameter (or width) of the plate 22 is smaller than the outer diameter (or width) of the bottom 31 of the frame 3, and the hole 31 c is provided in the bottom 31.

  On the other hand, in the second embodiment, as shown in FIG. 2, the outer diameter (or width) of the plate 22 is made equal to or larger than the outer diameter (or width) of the bottom portion 31 of the frame 3. In this case, even if the hole 31 c is provided in the bottom 31, it is blocked by the plate 22 and it is difficult to send air into the magnetic circuit 2. Therefore, in the second embodiment, a plurality of recesses 31f are provided in which the outer peripheral edge of the bottom 31 is bent toward the sound radiation side or the damper 6 side, and the hole 31c is provided in the upper surface 31g of the recess 31f. . The hole 31 c communicates with the outside through the opening of the recess 31 f. Further, a part of the periphery of the hole 31c is surrounded by the side surface forming the recess 31f. Thereby, it can suppress that it becomes difficult for the hole part 31c to be obstruct | occluded by the plate 22, and to send in air. Moreover, by providing the hole 31c in the recess 31f as in the second embodiment, the side surface forming the recess 31f becomes a wall, narrowing the sand dust intrusion path to the hole 31c, and the frame from the hole 31c to the frame 3. It is possible to suppress the ingress of sand and dust into the interior.

  Although the second gap S2 is provided between the outer peripheral portion 72 of the case 7 and the magnetic circuit 2 according to the first and second embodiments described above, the present invention is not limited to this. Depending on the degree of dust, only the first gap S1 between the outer peripheral portion 72 of the case 7 and the outer peripheral portion 32 of the frame 3 may be provided.

  Further, according to the first and second embodiments described above, the inclined surface 32a1 is provided on the outer peripheral portion 32 of the frame 3 and the end on the opening side of the outer peripheral portion 72 of the case 7 is opposed to the inclined surface 32a1. Not limited to this. It is not essential to provide the inclined surface 32 a 1 on the outer peripheral portion 32 of the frame 3, and a surface perpendicular to the bottom portion 31 may be used.

  Further, according to the first and second embodiments described above, the second gap S2 is made narrower at the middle portion and wider at the bottom portion 71 side by making the magnet 21 project from the yoke 23 and the plate 22 toward the case 7 side. It is not limited to this. The middle portion of the outer peripheral portion 72 of the case 7 may be bent inward to provide the second gap S2 narrow at the middle portion and wide at the bottom portion 71 side.

  Further, according to the first and second embodiments described above, the second gap S2 is narrow at the intermediate position and wide at the bottom portion 71 side, but it is not limited to this. The second gap S2 may be provided with the same dimension up to the bottom portion 71.

  Further, according to the first and second embodiments described above, the magnetic circuit 2 is an external magnetic type magnetic circuit, but is not limited thereto. It may be an internal magnet type magnetic circuit. In the case of employing the internal magnetic type magnetic circuit, the middle portion of the second gap 2S is narrowed by causing the outer peripheral portion of the yoke to protrude to the case side from the magnet and the plate, and one of the second gaps 2S on the bottom portion 71 side. The part can be widened.

  As an example of mounting the speaker device 1, the speaker device 1 may be disposed in a trunk room of a vehicle. In this case, the speaker device 1 is arranged, for example, such that the sound emission direction Y1 faces the vehicle ceiling or an occupant such as a driver.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention. The magnet 21 and the plate 22 can be formed concentrically. The inclination angle of the second inclined portion 72b with respect to the bottom portion 71 may be substantially vertical. The shape of the hole 31c may be an arbitrary shape such as a perfect circle, an ellipse, a track shape, a rectangle such as a square or a rectangle.

REFERENCE SIGNS LIST 1 speaker device 2 magnetic circuit 3 frame 6 damper 7 case 21 magnet 22 plate 23 yoke 31 bottom 31 c hole 32 outer circumferential portion 32 a 1 inclined surface 71 bottom 72 outer circumferential portion S 1 first gap S 2 second gap Y 1 sound radiation direction

Claims (1)

A case having an outer periphery and a bottom ;
A magnetic circuit located at the bottom of the case;
A frame having a connecting portion to which the magnetic circuit is connected and a hole opening toward the case, and a gap between the outer peripheral portion and the frame;
The speaker device according to claim 1, wherein the hole portion is located in a concave portion that is recessed outward from the connecting portion and toward the sound emission side .

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