JP4435245B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device, and more particularly to a speaker device in which a second speaker is mounted on a center pole that forms a magnetic circuit of a first speaker.

  2. Description of the Related Art A coaxial type (coaxial type) speaker device is known in which a plurality of speakers having different sound ranges are arranged coaxially, and a high sound side speaker is mounted on a center pole of a low sound side speaker. Such a speaker device can radiate the sound emitted from the speakers carrying the respective bands from almost the center of the low-frequency speaker, and can be configured in a simple and overall manner. Therefore, it is widely used especially as a vehicle-mounted speaker device.

  Japanese Patent Application Laid-Open No. 11-285091 discloses a structure in which a pillar supporting a speaker unit for middle and high sounds standing on a center yoke constituting a magnetic circuit of a speaker unit for bass is formed into a polygonal shape to enhance the thermal radiation effect on the surface. So that the heated air in the space of the magnetic circuit is released to the outside of the cone through the groove, so as to enhance the cooling effect of the coaxial type speaker device used in a narrow place such as a vehicle. A coaxial type speaker device is disclosed.

In such a speaker device, for example, an aluminum alloy drawing material is used as a support column erected on the center yoke of the bass speaker, and the column is fixed to the center pole of the bass speaker with screws. The bottom of the magnetic circuit of the treble speaker is bonded and fixed to the tip of the column. Therefore, the positioning of the middle / high tone speaker attached to the tip of the column is not necessarily reliable, and in some cases, the center positions of the low tone speaker and the high tone speaker may be shifted from each other. In addition, since the treble speaker is attached by being bonded and fixed to the tip portion of the support column, there is a possibility that the treble speaker is not sufficiently held. In addition, an adhesive layer is interposed between the tip of the column and the bottom of the magnetic circuit of the treble speaker, and this adhesive layer prevents heat conduction between the magnetic circuit of the treble speaker and the column, This particularly hinders the heat dissipation of the magnetic circuit of the loudspeaker.
JP-A-11-285091 JP-A-7-322385 JP 2002-215270 A

  The subject of this invention is providing the speaker apparatus which can hold | maintain a 2nd speaker stably on the center pole of a 1st speaker.

  Another subject of this invention is providing the speaker apparatus which can position and attach a 2nd speaker correctly on the center pole of a 1st speaker.

  Still another problem of the present invention is that heat from the magnetic circuit of the second speaker mounted on the center pole of the first speaker via the support flows or is dissipated to the support, thereby It is an object of the present invention to provide a speaker device that can prevent the temperature of the magnetic circuit 2 from rising.

  Still another object of the present invention is to effectively use a grill frame for supporting a front speaker grill in a speaker device in which a second speaker is mounted on a center pole of a first speaker via a support. Then, it is providing the speaker apparatus which aimed at heat dissipation of the 1st speaker and the 2nd speaker.

  The above-described problems and other problems of the present invention will be clarified by the technical idea of the present invention and the embodiments thereof described below.

  The main invention of the present application is to attach a proximal end portion of a cylindrical metal support extending forward to a center pole forming a magnetic circuit of a first speaker, and to provide a fitting holding portion at the distal end portion of the support The fitting holding portion holds the second speaker that bears a higher sound range than the first speaker, and the coupling portion on the center side of the grill frame attached to the frame of the first speaker is connected to the support body. The present invention relates to a speaker device characterized in that the front portion of the second speaker is covered with a speaker grille which is brought into contact with a fitting holding portion and attached to the grill frame.

Here, it is preferable that the grill frame includes a radially extending arm, and a tip portion of the arm is attached to an outer peripheral portion of the frame of the first speaker. Further, it is preferable that the grill frame includes a total of four arms extending obliquely upward and downward on the left and right sides, and the tip ends of the arms are attached to the outer periphery of the frame of the first speaker. Further, it is preferable that a speaker grill mounting portion is provided at the center of the grill frame, and the coupling portion is provided behind the mounting portion. Moreover, it is preferable that the front-end | tip part of the said fitting holding | maintenance part is pinched and hold | maintained by the outer peripheral part of the flame | frame of the said 2nd speaker, and the connection part of the said grille frame. Moreover, it is preferable that the support body holding the second speaker extends forward through the inner space of the voice coil bobbin of the first speaker.

  According to the main invention of the present application, when the coupling portion on the center side of the grill frame is brought into contact with the fitting holding portion of the support, heat flows from the fitting holding portion to the grill frame side through the grill frame coupling portion. . Therefore, the grill frame functions as a heat radiating means, and it is possible to prevent the temperature of the first speaker or the second speaker from rising.

  FIG. 1 and FIG. 2 show the overall configuration of the speaker device according to the present embodiment, and this speaker device includes a magnetic circuit 10 of a first speaker that bears a low sound range. As shown in FIG. 2, the magnetic circuit 10 includes a yoke 11 having a substantially disk shape, and a cylindrical center pole 12 protruding upward is integrally provided at the center of the yoke 11. A ring-shaped magnet 13 is attached to the outer peripheral side of the center pole 12. The magnet 13 is magnetized so that both ends in the axial direction have different polarities. A ring-shaped plate 14 is attached to the upper surface of the magnet 13.

  A portion between a circular opening provided at the center of the plate 14 and the outer peripheral surface of the center pole 12 forms an air gap 15, and a voice coil 16 is disposed in the air gap 15. That is, the voice coil 16 is disposed in the air gap 15 while being wound around the outer peripheral portion of the cylindrical bobbin 17.

  On the plate 14, a steel frame 20 having a cup shape with an open front side is attached. A diaphragm 21 made of a cone is attached in the frame 20. That is, the outer peripheral portion of the diaphragm 21 is attached and fixed to the front surface of the outer peripheral edge portion of the frame 20 via the edge 22 formed of a ring having a semicircular cross section. Fixed to.

  The central portion of the diaphragm 21 is fixed to the outer periphery of the bobbin 17 around which the voice coil 16 is wound. Further, a damper 24 is disposed below the diaphragm 21 in FIG. The damper 24 connects the bobbin 17 and the frame 20. An input terminal plate 25 is provided on the outer surface of the frame 20. A tinsel wire 26 is connected to the input terminal board 25.

  A cylindrical support 30 is mounted on the center pole 12 of the magnetic circuit 10 as shown in particular in FIG. The cylindrical support 30 is formed by forging a metal, for example, a metal such as iron, steel, copper, brass, or aluminum alloy, and a bottom portion thereof is fixed to the upper surface of the center pole 12 by a screw 31. ing. The tubular support 30 supports the middle / high tone speaker 32.

  The magnetic circuit 33 of the middle / high tone speaker 32 includes a cup-shaped yoke 34, and a magnet 35 is held in the center of the yoke 34. A center pole 36 is mounted on the magnet 35, and a portion on the outer peripheral side of the center pole 36 and a portion between the inner peripheral surface of the yoke 34 forms an air gap. A voice coil 37 is wound around the bobbin 38 in the air gap.

  A diaphragm 41 composed of a cone of the mid-high sound speaker 32 is attached to the bobbin 38, and an outer peripheral portion of the diaphragm 41 is supported by a frame 43. A damper 42 is disposed between the bobbin 38 and the frame 43. A decorative ring 44 is attached to the outer peripheral side of the frame 43. A dome-shaped cap 45 is attached so as to close the opening of the bobbin 38.

  Next, the operation of such a speaker will be described. When an audio signal is supplied to the voice coil 16 of the first speaker via the input terminal board 25, the voice coil 16 disposed in the air gap 15 of the magnetic circuit 10 by this audio signal is bobbins according to Fleming's left-hand rule. Receives 17 axial forces. For this reason, the bobbin 17 moves in the same direction, and accordingly, the diaphragm 21 vibrates in the same direction to reproduce sound.

  The operation of the second middle / high tone speaker 32 is the same. When an audio signal is supplied to the voice coil 37 disposed in the air gap of the magnetic circuit 33 via the input terminal board 25, the left hand of Fleming According to the law, a force in the axial direction of the bobbin 38 is generated, and for this purpose, the diaphragm 41 coupled to the bobbin 38 vibrates in the axial direction of the bobbin 38. Accordingly, the middle and high range sound is reproduced.

  Such a speaker device is characterized in that the cylindrical support 30 that fits and holds the second medium / high-frequency speaker 32 effectively contributes to heat dissipation. When the temperature changes of the voice coils 16 and 37 of the first and second speakers are measured when the steel formed by forging, for example, is used as the cylindrical support 30 as described above, the result shown in FIG. 4 is obtained. It was. That is, when continuous input was performed at 50 W, the temperature of the voice coil 16 of the first bass speaker (WF) was finally saturated at 178 ° C. and stabilized. On the other hand, the voice coil 37 of the second middle / high tone speaker (TW) 32 was saturated at 158 ° C.

  By supporting the magnetic circuit 33 of the second speaker 32, in particular, the metal cylindrical support 30, the temperature increase of the second speaker (TW) 32 is moderated by the increase of the heat capacity by the cylindrical support 30. At the same time, the saturation temperature of the second speaker 32 is lowered by the heat dissipation effect of the cylindrical support 30. Also for the first speaker, the temperature of the voice coil 16 in the magnetic circuit 10 is lowered because the heat is radiated by the cylindrical support 30.

  FIG. 5 shows a speaker of a comparative example in which the cylindrical support 30 is formed from a resin molded body. FIG. 6 shows a change in temperature when 50 W of continuous input is performed for such a comparative speaker.

  When resin is used as the cylindrical support body 30, since this support body 30 functions as a heat insulating means, the heat dissipation of the magnetic circuit 33 of the second speaker 32 is particularly disturbed, and the temperature rise of the voice coil 37 becomes abrupt. . Finally, heat is stored in the magnetic circuit 33 of the second speaker, and the temperature of the voice coil 37 finally reaches 188 ° C. The voice coil 16 portion of the first speaker is also stored in the magnetic circuit 10 and is not dissipated, so that the final temperature is 184 ° C. and the metal cylindrical support 30 is used. The temperature becomes higher than. Therefore, if a metal is used instead of resin as the cylindrical support 30, the cooling efficiency increases by 6% for the bass speaker (WF) 32 and 20% for the treble speaker (TW).

  Another feature of such a speaker device is that, as shown in FIGS. 2 and 3, a second pole 32 for medium and high tones is connected to a center pole 12 of the magnetic circuit 10 of the first speaker via a cylindrical support 30. It is to support above. That is, the outer peripheral portion of the magnetic circuit 33 of the mid-high sound speaker 32 is received by the fitting holding portion on the distal end side of the cup-shaped cylindrical support body 30, and the mid-high sound speaker 32 is stably held. In this embodiment, the open end of the cylindrical support 30 is abutted against the lower end of the frame 43 of the medium / high tone speaker 32.

  Therefore, according to such a structure, the positioning of the second speaker 32 in the circumferential direction and the height direction is very stable. In particular, when the inner diameter of the open end of the cylindrical support 30 is matched with the outer diameter of the magnetic circuit 33 of the medium / high tone speaker 32 with high accuracy, the second speaker 32 can be stably held by the fitting accuracy of the two. It becomes possible and positioning of the second speaker 32 becomes very easy.

  Further, the magnetic circuit 33 of the middle / high-pitched sound speaker 32 is not necessarily used by the fitting force of fitting on the center pole 12 of the first speaker via the fitting holding portion at the tip of the cylindrical support 30 without using an adhesive. It becomes possible to install. Therefore, the adhesive layer becomes a heat insulating layer, and the flow of heat from the second speaker 32 to the cylindrical support 30 is not hindered. This particularly means that an excessive temperature rise of the magnetic circuit 33 of the mid-high sound speaker 32 can be prevented. That is, the cylindrical support 30 can prevent the temperature increase of the magnetic circuit 33 of the second speaker 32 as well as the magnetic circuit 10 of the first speaker.

  Next, a modification of the above embodiment will be described. In the modification shown in FIG. 7, not only the outer peripheral portion of the magnetic circuit 33 of the loudspeaker 32 for medium and high sounds but also the frame 43 of this loudspeaker by the fitting support portion of the cylindrical support 30 attached on the center pole 12 of the first speaker. The outer peripheral part is also covered. That is, the cylindrical support body 30 is narrowed down to three stages so as to be substantially aligned with the outer peripheral portion of the magnetic circuit 33 of the speaker 32 and the outer peripheral portion of the frame 43. The magnetic circuit 33 and the frame 43 of the loudspeaker 32 are received. Accordingly, the holding of the second speaker 32 becomes stable, and in particular, the heat radiation of the second speaker 32 can be reliably performed by the cylindrical support body 30.

  FIG. 8 shows another modification. In this modified example, a bolt 31 penetrating the center pole 12 of the first speaker is screwed into the female screw hole of the yoke 34 of the magnetic circuit 33 of the second speaker 32, and the second speaker 32 is pulled downward by the bolt 31. Thus, the cylindrical support 30 is fixed on the center pole 12. The cylindrical support 30 is fitted and held on the outer peripheral surface of the magnetic circuit 33 of the second speaker 32. In addition, the bent portion of the upper end of the cylindrical support 30 in the radial direction is in contact with the lower end of the frame 43. The frame 43 is also used as a decorative ring.

  FIG. 9 shows still another modification. In this modification, a bolt 31 penetrating the center pole 12 of the first speaker is screwed into the female screw hole of the yoke 34 of the magnetic circuit 33 of the second speaker 32, and the yoke 34 is pulled downward to support the cylinder. The body 30 is fixed on the center pole 12. The cylindrical support 30 is formed so that the upper end thereof is opened substantially to the outer peripheral side, and the opened portion receives the lower surface of the yoke 34.

  10 and 11 show still another modification example. Also in this modified example, the bolt 31 passes through the center pole 12 and is screwed into the female screw hole of the yoke 34 of the magnetic circuit 33 of the second speaker 32. The outer peripheral surface of the magnetic circuit 33 of the second speaker 32 is held by the fitting support portion on the upper end side of the cylindrical support body 30. In addition, the flange portion on the distal end side of the cylindrical support 30 is in contact with the lower surface of the frame 43 and the decorative ring 44 of the second speaker 32. Here, in particular, the decoration ring 44 is made of an aluminum die-cast decoration ring, and constitutes a heat sink. Therefore, even if the heat of the magnetic circuits 10 and 33 is transmitted to the cylindrical support 30, this heat is further dissipated by the decorative ring 44.

  Next, a second embodiment will be described with reference to FIGS. In this embodiment, a grille frame 50 holding a speaker grille 54 is coupled to the cylindrical support 30. That is, the grill frame 50 is attached to the outer periphery of the frame 20 on the front side of the first speaker. The grill frame 50 is made of, for example, an aluminum alloy molded body, and its main part has an elliptical shape. A total of four arms 51 extending obliquely upward and obliquely downward are connected to the grill frame 50, and the distal ends of these arms 51 are fixed to the outer peripheral portion of the frame 20.

  A coupling portion 52 formed of a circular recess is formed at the center side portion of the grill frame 50, and the inner peripheral surface of the coupling portion 52 is formed on the outer peripheral surface of the cylindrical support portion 30 as shown in FIGS. It is designed to be fitted. A speaker grill 54 made of a metal net is attached to a step 53 provided inside the grill frame 50. The speaker grille 54 covers the front side of the second speaker 32.

  The cylindrical support 30 coupled to the coupling portion 52 of the grill frame 50 is fixed by a bolt 31 on the center pole 12 of the first speaker, and the magnetic circuit 33 of the second speaker 32 is fixed. The magnetic circuit 33 is held by being fitted to the outer peripheral portion, and the both end portions of the cylindrical support 30 are further narrowed down to two stages to hold the outer peripheral portion of the frame 43. The outer peripheral surface of the cylindrical support 30 that holds the outer peripheral portion of the frame 43 of the second speaker is fitted to the outer peripheral surface of the coupling portion 52 of the grill frame 50.

Therefore, according to such a configuration, the cylindrical support body 30 that supports the second speaker 32 on the center pole 12 of the first speaker is fitted with the coupling portion 52 of the grill frame 50 at the outer peripheral portion on the tip side. Will be combined. Therefore, especially the grill frame 50 functions as a heat radiating unit with respect to the cylindrical support 30 and the outer peripheral portion on the distal end side of the cylindrical support 30 is stably positioned and held.
Next, a third embodiment will be described with reference to FIGS. In this embodiment, a third speaker, that is, a high-frequency speaker 63 is attached to the front end portion of the second speaker 32 via a support body 60. A die cast support 60 made of aluminum alloy is attached to the outer periphery of the frame 43 of the second speaker 32 attached to the center pole 12 of the first speaker via the cylindrical support 30. A holding portion 62 that protrudes in the radial direction is formed at a predetermined position in the circumferential direction of the support body 60, and the treble speaker 63 is held by the holding portion 62.

  A cylindrical support 30 is mounted on the center pole 12 of the first speaker, and a bolt 31 passing through the center pole 12 is screwed into the female screw hole of the yoke 34 of the magnetic circuit 33 of the second speaker 32. Further, the cylindrical support 30 is formed with a flange 59 at the tip end portion thereof, and the flange 59 supports the support 60 through a screw 61 on the front side portion thereof.

  Therefore, the support body 60 is attached and held on the flange 59 of the cylindrical holding portion 30, and the support body 60 also serves as the heat dissipation means of the cylindrical support body 30 together with the support means of the high-frequency speaker 63. Therefore, the temperature rise of the cylindrical support 30 can be prevented by the support 60.

  The present invention can be widely used for reproducing sound, particularly as a coaxial speaker device in which a plurality of speakers are coaxially mounted. In particular, it can be widely used as a vehicle-mounted speaker that must be arranged in a limited space.

It is a front view which shows the whole shape of a speaker. It is the sectional view on the AA line in FIG. It is the principal part expanded sectional view. It is a graph which shows the state of the temperature change of the voice coil of a speaker. It is a principal part expanded sectional view of the speaker of the comparative example using the cylindrical support body made from resin. It is a graph which shows the state of the change of the temperature of the voice coil of the speaker. It is a principal part expanded sectional view of the speaker apparatus of a modification. It is a principal part expanded sectional view of the speaker apparatus of another modification. It is a principal part expanded sectional view of the speaker apparatus of another modification. It is a front view of the speaker apparatus of another modification. It is a principal part expanded sectional view of the speaker apparatus. It is a front view of the speaker apparatus of 2nd Embodiment. It is the principal part longitudinal cross-sectional view. It is a principal part disassembled perspective view of the speaker apparatus. It is a front view of the speaker apparatus of 3rd Embodiment. It is the BB sectional view taken on the line in FIG. It is the principal part disassembled perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Magnetic circuit, 11 ... York, 12 ... Center pole, 13 ... Magnet, 14 ... Plate, 15 ... Air gap, 16 ... Voice coil, 17 ... Bobbin, 20 ... Frame, 21 Vibration plate (cone), 22 edge, 23 gasket, 24 damper, 25 input terminal plate, 26 tin wire, 30 cylindrical support, 31 screw, 32 ··· Middle and high frequency speakers, 33 ··· Magnetic circuit, 34 ··· York, 35 ··· Magnet, 36 · · · Center pole, 37 · · · Voice coil, 38 · · · Bobbin, 39 · · · Plate, 41 · · · Diaphragm (Cone), 42 ... damper, 43 ... frame, 44 ... decorative ring, 45 ... cap, 50 ... grill frame, 51 ... arm, 52 ... coupling part, 53 ... step part, 54 ...・ ・ ・ Speaker grease , 59 ‥‥ flange, 60 ‥‥ support, 61 ‥‥ bis, 62 ‥‥ holding portion, 63 ‥‥ tweeter

Claims (6)

  A base end portion of a cylindrical metal support extending forward is attached to a center pole that forms the magnetic circuit of the first speaker, and a fitting holding portion is provided at a distal end portion of the supporting body. The second speaker bearing a higher sound range than the first speaker is held, and the coupling portion on the center side of the grill frame attached to the frame of the first speaker is brought into contact with the fitting holding portion of the support. A speaker device that covers the front of the second speaker by a speaker grille attached to the grill frame.   The speaker device according to claim 1, wherein the grill frame includes an arm extending radially, and a tip portion of the arm is attached to an outer peripheral portion of the frame of the first speaker.   The grill frame includes a total of four arms that extend diagonally upward and downward on the left and right sides, respectively, and the tip ends of the arms are attached to the outer periphery of the frame of the first speaker. 2. The speaker device according to 1.   The speaker device according to claim 1, wherein an attachment portion of a speaker grill is provided at a center portion of the grill frame, and the coupling portion is provided behind the attachment portion.   2. The speaker device according to claim 1, wherein a tip end portion of the fitting holding portion is sandwiched and held by an outer peripheral portion of a frame of the second speaker and a coupling portion of the grill frame.   The speaker device according to claim 1, wherein a support body that holds the second speaker extends forward through an inner space of a voice coil bobbin of the first speaker.

Images