loudspeaker

Abstract

Provided is a speaker capable of improving the heat dissipation effect of a circuit portion fixed to a support. The rear of a vibrating portion (2) is covered by a cover member (13), and a duct (14) is provided in the cover member (13). A recess (13c) is formed in the cover member (13), and an air flow path (16) is formed inside the recess (13c). A circuit portion (30) is provided on the outer surface of the cover member (13), and a heat dissipation device (33) provided inside the air flow path (16) is thermally conductively connected to the circuit portion (30). The air flow in the air flow path (16) is accelerated by the vibration of the vibrating portion (2), and the heat dissipation effect from the heat dissipation device (33) is improved.

Description

Technical Field

[0001] The present invention relates to a loudspeaker that improves the heat dissipation effect of the circuit section in a loudspeaker in which a heat-generating electronic component is provided. Background Technology

[0002] The loudspeaker described in Patent Document 1 has a frame fixed to the upper part of the magnetic circuit. A vibration system consisting of a diaphragm and a coil is supported inside the frame in a vibration-free manner by means of edges and dampers. A retaining member with an increased heat dissipation area is fixed to the upper surface of the centerpole of the magnetic circuit, and the amplifier is fixed on the retaining member. The invention is that if the diaphragm vibrates with a large amplitude in the low-frequency range and the airflow above the diaphragm increases, the heat dissipation and cooling effect of the amplifier, which is exposed to the outside air above the diaphragm, can be increased.

[0003] In the audio device described in Patent Document 2, a drive cone and a drive motor structure for vibrating the drive cone are provided in the frame member. An amplifier assembly is provided in the volume portion in front of the drive cone. The amplifier assembly has a heat sink and an amplifier cover that is in thermal contact with the heat sink and holds the amplifier. Furthermore, if the drive cone vibrates at an audible frequency, air movement is generated in the volume portion through pressure waves that become sound waves, facilitating heat dissipation from the amplifier assembly.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: (Japan) Utility Model Application Publication No. 1-149191

[0007] Patent Document 2: Japanese Patent Application Publication No. 2004-120747 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In the inventions described in Patent Documents 1 and 2, when the vibrating plate or driving cone vibrates, an airflow close to laminar flow is generated in front of it. This airflow moves back and forth only over a wide area. The amplifier is positioned with its exposed space only in front of the vibrating plate or driving cone. Therefore, even if the airflow close to laminar flow acts on the amplifier, it cannot sufficiently agitate the air around the amplifier, and heat tends to stagnate around the amplifier, limiting its effectiveness in improving heat dissipation.

[0010] The present invention addresses the aforementioned problems and aims to provide a speaker that improves the heat dissipation of the circuit section.

[0011] Methods for solving problems

[0012] The present invention is characterized in that, in a loudspeaker, a vibrating part including a diaphragm and a voice coil, a magnetic circuit part that applies a magnetic field to the voice coil, and a support body supporting the vibrating part and the magnetic circuit part are provided. The support body includes a cover member that covers the vibrating part from one side of the vibration direction of the vibrating part, and a duct that communicates the space between the vibrating part and the cover member with an external space further out than the cover member. An airflow path is formed in which the distance between the vibrating part and the cover member in the vibration direction is wider than other parts in the space. The airflow path passes through the interior of the duct. A circuit part disposed on the outside of the cover member and a heat sink exposed in at least part of the airflow path are connected in a manner that enables heat conduction.

[0013] In the loudspeaker of the present invention, preferably a recess is formed in a portion of the area of ​​the cover member that covers the vibrating part, the recess being recessed in a direction away from the vibrating part, and the interior of the recess serves as the airflow path.

[0014] In the loudspeaker of the present invention, for example, the airflow path surrounds the central axis of the vibrating part and is continuous, and the duct is provided at a position offset from the central axis.

[0015] Alternatively, in the loudspeaker of the present invention, the conduit is positioned offset from the central axis of the vibrating part, and at least a portion of the airflow path passes through the central axis.

[0016] Alternatively, in the loudspeaker of the present invention, the duct is disposed on the central axis of the vibrating part, and the airflow path extends from the outer peripheral side of the vibrating part toward the central axis.

[0017] In the loudspeaker of the present invention, it is preferable that a vibrating plate with a conical portion is provided in the vibrating part, and a cover cone portion is provided in the cover member opposite to the conical portion and inclined in the same direction as the conical portion, and the interval of the vibration direction in the airflow path is wider than the interval of the vibration direction of the vibrating part and the cover cone portion.

[0018] In the speaker of the present invention, the heat sink preferably has a groove that extends through the airflow path in the direction toward the duct.

[0019] The loudspeaker of the present invention can be configured such that the circuit section has a circuit board fixed to the outer surface of the cover member and electronic components mounted on the circuit board, and the heat sink is connected to the circuit section through an opening formed in the cover member.

[0020] Invention Effects

[0021] The loudspeaker of the present invention is provided with a cover member that covers the vibrating plate from one side of the vibration direction of the vibrating part. An airflow path is formed within the closed space between the vibrating plate and the cover member, and a heat sink is disposed in this airflow path. When the vibrating part vibrates, airflow is generated within the airflow path, so heat dissipation can be effectively implemented from the heat sink located within the airflow path. Attached Figure Description

[0022] Figure 1 This is a perspective view showing the appearance of the speaker according to the first embodiment of the present invention from the rear.

[0023] Figure 2 This is an exploded perspective view of the speaker according to the first embodiment, shown from the rear.

[0024] Figure 3 Therefore Figure 1 The diagram shows a cross-sectional view of the loudspeaker of the first embodiment cut off by line III-III.

[0025] Figure 4 This is a cross-sectional view showing the loudspeaker according to the second embodiment of the present invention.

[0026] Figure 5 This is a perspective view showing the appearance of the speaker according to the third embodiment of the present invention from the rear.

[0027] Figure 6 Therefore Figure 5 The diagram shows a cross-sectional view of the loudspeaker of the third embodiment cut off by the VI-VI line.

[0028] Figure 7 This is a perspective view showing the appearance of the speaker according to the fourth embodiment of the present invention from the rear.

[0029] Figure 8 Therefore Figure 7 The diagram shows a cross-sectional view of the speaker of the fourth embodiment cut off by line VIII-VIII.

[0030] Label Explanation

[0031] 1, 101, 201, 301 loudspeakers

[0032] 2. Vibrating section

[0033] 3. Vibrating plate

[0034] 4. Edge components

[0035] 5 spools

[0036] 6. Cover components

[0037] 7. Vibration damper components

[0038] 8 voice coils

[0039] 10 Support body

[0040] 13 Cover components

[0041] 13a Conical part of the cover

[0042] 13c recess

[0043] 13d central fovea

[0044] 13f Straight concave part

[0045] 14 Pipelines

[0046] 15 Space

[0047] 16 Airflow path

[0048] 18. Opening

[0049] 20 Magnetic circuit part

[0050] 30 Circuit Section

[0051] 31 Circuit board

[0052] 32 Electronic Components

[0053] 33 Radiator

[0054] 33a Groove

[0055] 116 Central Airflow Path

[0056] 216 Straight Airflow Path

[0057] O Central axis Detailed Implementation

[0058] In the first to fourth embodiments of the present invention described below, the Y1-Y2 direction is the vibration direction of the vibrating part 2. In each embodiment, the Y1 direction is forward and is the sound-emitting direction, and the Y2 direction is rearward. The speaker in each embodiment is for vehicle use. As an example of speaker installation, the front (Y1 direction) of the sound-emitting direction faces the interior of the vehicle, and the conduit 14 provided at the rear is fixed to the vehicle body in a manner that communicates with the external space of the vehicle. In another example, the speaker is disposed in a space outside the vehicle, such as the engine compartment or luggage compartment, and the conduit 14 faces the interior of the vehicle. In this case, the Y2 direction becomes the front facing the interior of the vehicle and is the sound-emitting direction, and the Y1 direction becomes the rear facing the exterior of the vehicle.

[0059] (First Implementation)

[0060] Figures 1 to 3In the speaker 1 of the first embodiment of the present invention shown, the lower part of the illustration represents the front (Y1 direction) and the direction of sound emission, while the upper part represents the rear (Y2 direction). Figure 4 In the second to fourth embodiments described thereafter, the bottom of the illustration is the front (Y1 direction) and the direction of sound emission, and the top of the illustration is the rear (Y2 direction).

[0061] Figures 1 to 3 The speaker 1 shown has a support 10. (As...) Figure 2 As shown, the support body 10 has a front frame 11 located at the front, a rear frame 12 located at the rear, a cover member 13 overlapping the rear of the rear frame 12, and a conduit 14 disposed on the cover member 13. The conduit 14 is integrally formed with the cover member 13. Alternatively, the conduit 14 is separately formed from the cover member 13 and fixed to the cover member 13. A diaphragm 3 is disposed inside the speaker 1. The planar shape of the diaphragm 3 projected from the front or rear is circular, and it has a tapered portion whose diameter gradually increases towards the front (Y1 direction), which is the sound emission direction. The planar shape of the front frame 11, the rear frame 12, and the main part of the cover member 13 projected from the front or rear is circular. Alternatively, the planar shape of the diaphragm 3, the front frame 11, the rear frame 12, and the cover member 13 projected from the front or rear may also be elliptical or oblong.

[0062] like Figure 3 As shown, multiple openings 11a are formed in the front frame 11, through which the sound pressure from the vibration of the vibrating plate 3 can pass forward (in the Y1 direction). Multiple openings 12a are also formed in the rear frame 12. The cover member 13 covers the entire area including the space behind the vibrating part 2 of the vibrating plate 3, except for the internal space of the pipe 14.

[0063] like Figure 3 As shown, the vibrating part 2 includes the vibrating plate 3, the edge member 4, the spool 5, and the cover member 6. In the figures illustrating various embodiments, a central axis O extending in the front-to-back direction (the vibration direction of the vibrating part 2) through the center of the vibrating part 2 is shown. The edge member 4 is formed of a sheet material with a semi-circular cross-section that can elastically deform. Viewed from the front or rear, the edge member 4 has a ring-shaped planar shape, and its inner periphery 4a is bonded to the outer edge 3a of the vibrating plate 3. The outer periphery 4b of the edge member 4 is sandwiched between the outer periphery of the front frame 11 and the outer periphery of the rear frame 12, and the outer periphery of the front frame 11, the rear frame 12, and the cover member 13 are fixed by screws or the like. The spool 5 is mounted on the central axis O of the speaker 1, and the inner edge 3b of the vibrating plate 3 is bonded to the outer peripheral surface of the spool 5 and fixed thereon. The rearward (Y2 direction) opening of the spool 5 is covered by the cover member 6.

[0064] A damper component 7 is provided inside the loudspeaker 1. The damper component 7 is formed of a corrugated, elastically deformable sheet material. Two damper components 7 are arranged parallel to each other in the front-to-back direction. The outer periphery 7a of each is bonded to the rear frame 12 and fixed, while the inner periphery 7b is bonded to the outer peripheral surface of the spool 5 and fixed. In the vibrating section 2, the diaphragm 3, the spool 5, and the cover component 6 are supported by the edge component 4 and the damper component 7, which are part of the vibrating section 2, in a manner that allows for free vibration in the front-to-back direction.

[0065] like Figure 3 As shown, a voice coil 8 is wound around the outer periphery of the front end (Y1 direction) of the linear shaft 5. The voice coil 8 is also part of the vibrating part 2. The voice coil 8 and the magnetic circuit part 20 constitute the magnetic drive part. The magnetic circuit part 20 has a front yoke 21, a central rod 22, and a rear yoke 24. The front yoke 21, the central rod 22, and the rear yoke 24 are formed of magnetic material. A ring-shaped magnet 23 is sandwiched between the front yoke 21 and the rear yoke 24. A magnetic gap is formed at the opposing portion of the outer peripheral surface of the central rod 22 and the inner peripheral surface of the rear yoke 24, and the voice coil 8 is located within the magnetic gap. The magnetic flux passing through the magnetic gap through the magnetic field generated by the magnet 23 passes through the voice coil 8.

[0066] like Figure 1 and Figure 2 As shown, regarding the cover member 13, the annular region centered on the central axis O becomes the tapered portion 13a of the cover. Figure 3 As shown, the conical portion 13a of the cover and the conical portion of the vibrating plate 3 are inclined in the same direction, and the conical portion of the vibrating plate 3 and the conical portion 13a of the cover are positioned approximately parallel to each other. Regarding the cover member 13, the central region surrounded by the conical portion 13a becomes a raised portion 13b that bulges rearward. On the inner surface facing the front (Y1 direction) of the cover member 13, a recess 13c is formed that is recessed rearward (Y2 direction), which is the direction of separation from the vibrating portion 2. The recess 13c is formed along an arc trajectory centered on the central axis O in the outer periphery of the conical portion 13a.

[0067] like Figure 3 As shown, a space 15 is formed between the vibrating section 2 and the cover member 13. In the vibrating section 2, an edge member 4 is provided on the outer periphery of the vibrating plate 3, and a cover member 6 is provided in the center of the vibrating plate 3 to plug the opening of the spool 5. Therefore, the space 15 behind the vibrating section 2 (in the Y2 direction) is isolated from the space in front of the vibrating section 2 (in the Y1 direction). The internal space of the pipe 14 communicates with the space 15, and the space 15 is isolated from the external space except for the internal space of the pipe 14.

[0068] like Figure 3As shown, within the space 15, in the region where the recess 13c is formed, the front-to-back distance (the distance in the vibration direction of the vibrating part 2) L1 in the rear direction (Y2 direction) towards the rear of the vibrating part 2 and the front direction (Y1 direction) towards the front of the cover member 13 is wider than the front-to-back distance in other parts of the space 15. Figure 3 In the embodiment shown, the other part is the opposing portion of the conical portion of the vibrating plate 3 and the conical portion 13a of the cover. The front-back spacing L1 in the portion where the recess 13c is formed is wider than the front-back spacing L2 (the spacing in the vibration direction of the vibrating portion 2) in the opposing portion.

[0069] In the space 15 between the vibrating part 2 and the cover member 13, the region formed along an arc trajectory centered on the central axis O, defined by the interval L1, becomes the airflow path 16. In this specification, the internal space of the recess 13c of the cover member 13 can be defined as the airflow path 16 only. This is the narrow definition of the airflow path. Alternatively, the entire space consisting of the internal space of the recess 13c, the internal space of the edge member 4 with a semi-circular cross-section, and the space sandwiched between the recess 13c and the edge member 4 (the space of interval L1) can be defined as the airflow path 16. This is the broad definition of the airflow path. Alternatively, the region after removing the internal space of the edge member 4 from the region of interval L1 can also be defined as the airflow path 16. Furthermore, for structures where the recess 13c is not provided on the cover member 13, the region after removing the internal space of the recess 13c from the region of interval L1, i.e., the internal space of the edge member 4 and the continuous space behind it, functions as the airflow path 16.

[0070] like Figure 1 and Figure 3 As shown, the airflow path 16 extends along an arc trajectory centered on the central axis O within a region of a certain radius from the central axis O. Furthermore, the airflow path 16 communicates with the internal space of the pipe 14. By forming the airflow path 16 along an arc trajectory with a certain radius centered on the central axis O, when the vibrating part 2 vibrates back and forth, the viscous resistance of the air generated through the space 15 can be uniformly applied to the vibrating part 2.

[0071] like Figure 2As shown, in the cover member 13, an opening 18 is formed at a position where a recess 13c is formed and close to the pipe 14. In the region where the opening 18 is formed, a circuit section 30 is provided on the outer surface facing the rear of the cover member 13. The circuit section 30 has a circuit board 31, and electronic components (electronic parts) 32 are mounted on the surface facing the rear of the circuit board 31. The circuit section 30 constitutes an amplifier, and the electronic components 32 include heat-generating electronic components (heat-generating electronic parts). The outer surface of the cover member 13 where the circuit section 30 is provided is a flat surface, which allows the circuit section 30 to be stably mounted.

[0072] like Figure 3 As shown, at least a portion of a heat sink 33 is disposed in the internal space in front of the recess 13c, where the opening 18 is formed. The heat sink 33 is formed of a metal material with high thermal conductivity, such as aluminum or an aluminum alloy. On the surface facing forward (Y1 direction) of the circuit board 31, a heat-conducting portion in contact with heat-generating electronic components is formed of a metal layer or the like, and the heat sink 33 is connected to this heat-conducting portion. The heat sink 33 and the circuit section 30 are connected in a manner that allows heat conduction through the interior of the opening 18. Figure 2 and Figure 3 As shown, the radiator 33 has a plurality of slots 33a that extend in a direction intersecting the front-back direction (Y1-Y2 direction). Inside the recess 13c, the slots 33a extend in the direction of air flow along the air flow path 16, i.e., toward the pipe 14.

[0073] Next, the operation of the speaker 1 will be explained.

[0074] During sound generation, a driving current is supplied to the voice coil 8 based on the audio signal output from the audio amplifier. A driving magnetic flux surrounds the voice coil 8 within the magnetic circuit section 20 based on the magnetic field of the magnet 23, and this driving magnetic flux passes through the voice coil 8 located within the magnetic gap. The electromagnetic force generated by the driving magnetic flux passing through the magnetic gap and the driving current of the voice coil 8 causes the vibrating section 2, comprising the diaphragm 3, edge member 4, spool 5, and cover member 6, to vibrate in the longitudinal direction. The sound pressure generated towards the front (Y1 direction) of the diaphragm 3, primarily due to the longitudinal vibration of the diaphragm 3, passes through the opening 11a of the front frame 11 and is supplied to the vehicle interior. An air pressure opposite in phase to the sound pressure is generated behind the diaphragm 3 (Y2 direction), but this air pressure is discharged to the outside through the space 15 between the vibrating section 2 and the cover member 13 via the internal space of the pipe 14. Thus, interference between the sound pressure emitted towards the front (Y1 direction) and the air pressure opposite in phase is suppressed.

[0075] In the space 15 between the vibrating section 2 and the cover member 13, the air pressure changes due to the vibration of the vibrating section 2 in the front-to-back direction, resulting in airflow caused by this pressure change. In the space 15, the front-to-back distance L2 between the conical portion of the vibrating plate 3 and the opposing portion of the conical portion 13a of the cover is narrow, while the front-to-back distance L1 in the airflow path 16 becomes wider. Therefore, due to the pressure change within the space with the conical portion at distance L2, the airflow easily concentrates into the airflow path 16 at distance L1.

[0076] If the vibrating part 2 moves rearward (in the Y2 direction), the compressed air in the narrow space of the tapered portion with interval L2 flows into the airflow path 16, creating a flow in the airflow path 16, and the airflow is released from the pipe 14 to the external space. If the vibrating part 2 moves forward (in the Y1 direction), the volume of the space of the tapered portion with interval L2 expands and the air pressure decreases, so the air in the external space flows into the space of the tapered portion with interval L2 through the pipe 14 from the airflow path 16. As a result, an airflow along the airflow path 16 is easily generated in the space 15, and the radiator 33 located in the airflow path 16 is exposed to the airflow. The airflow path 16 is located inside the recess 13c along the arc trajectory. The heat generated by the circuit part 30 is released into the external space further rearward than the cover member 13, and the airflow transferred to the airflow path 16 through the radiator 33 passes through the internal space of the pipe 14 and is released to the external space. Within the airflow path 16, the slot 33a of the radiator 33 extends along the direction of airflow within the airflow path 16, thereby improving the heat dissipation effect from the radiator 33 into the airflow path 16.

[0077] like Figure 2 As shown, in the cover member 13, a recess 13c is continuously formed at the cover cone portion 13a, that is, an airflow path 16 is continuously formed in the space in front of the cover cone portion 13a. Furthermore, the airflow path 16 is formed along an arcuate trajectory centered on the central axis O and passes through the interior of the pipe 14 located at an outer peripheral position offset from the central axis O. In this configuration, due to pressure changes in the space of the cone portion, the airflow is easily concentrated in the arcuate trajectory of the airflow path 16, and this airflow passes through the interior space of the pipe 14 located in the outer peripheral region to the external space. At least a portion of the radiator 33 is located within the airflow path 16 and is positioned close to the pipe 14, thus facilitating heat dissipation from the radiator 33.

[0078] In the second to fourth embodiments, for those having the same Figures 1 to 3 The parts that have the same function as those in the first embodiment shown are given the same reference numerals and their detailed descriptions are omitted, even if they are different in shape, etc.

[0079] (Second Implementation)

[0080] At once Figure 4 In the second embodiment of the loudspeaker 101 shown, the support body 10 is composed of a front frame 11 and a cover member 13, and a rear frame 12 is not provided. The outer periphery 4b of the edge member 4 constituting the vibrating part 2 is fixed between the outer periphery of the front frame 11 and the outer periphery of the cover member 13. The vibrating plate 3 constituting the vibrating part 2 has a tapered portion whose diameter gradually increases towards the rear (Y2 direction), and the inclination direction of the tapered portion of the vibrating plate 3 is opposite to that of the first embodiment in terms of front and rear. The damper member 7 is located further forward (Y1 direction) than the vibrating plate 3. The cover member 6 covering the opening behind the spool 5 is a dome shape with the protruding side facing rearward.

[0081] The cover member 13 has a dome-shaped bulge 13b at its center, which bulges rearward following the cover member 6. A tapered cover portion 13a, centered on the central axis O, is continuously formed around the outer periphery of the bulge 13b in the cover member 13. The inclination direction of the tapered cover portion 13a is the same as that of the tapered portion of the vibrating plate 3. Furthermore, a recess 13c, recessed rearward, is formed on the outer periphery of the tapered cover portion 13a on the inner surface facing the front of the cover member 13. Similar to the first embodiment, the recess 13c is continuous approximately around its entire circumference along an arcuate trajectory centered on the central axis O. A conduit 14 is formed on the cover member 13 at a position offset from the central axis O, and the interior of the recess 13c communicates with the interior space of the conduit 14.

[0082] like Figure 4 As shown, in the speaker 101, the recess 13c of the cover member 13 is formed on the inner circumferential side closer to the central axis O than the portion opposite to the edge member 4. In the space 15, the area where the recess 13c and the diaphragm 3 are opposite each other forms the airflow path 16. The front-to-back spacing of the airflow path 16 is L1. On the side closer to the center than the recess 13c, the front-to-back spacing L2 between the conical portion of the diaphragm 3 and the portion opposite to the cover conical portion 13a narrows, and the front-to-back spacing between the cover member 6 and the portion opposite to the dome-shaped bulge 13b also becomes approximately L2. Therefore, the front-to-back spacing L1 of the airflow path 16 is wider than any other area within the space 15.

[0083] Furthermore, the radiator 33 is located inside the airflow path 16, close to the pipe 14, and the circuit section 30, which is located on the outer surface of the cover member 13, is connected to the radiator 33 in a manner that enables heat conduction.

[0084] In the second embodiment of the loudspeaker 101, in the space 15 between the vibrating part 2 and the cover member 13, the front-to-back distance L1 of the airflow path 16 widens, while the front-to-back distance L2 of the space 15 narrows compared to the entire area inside it. Therefore, if the vibrating part 2 vibrates back and forth, the pressure change in the narrow portion of the space 15 where the central portion of the cover cone portion 13a and the raised portion 13b is formed increases, and a high-velocity airflow is formed from the airflow path 16 to the internal space of the pipe 14. As a result, the heat dissipation effect from the radiator 33 can be improved.

[0085] (Third Implementation)

[0086] At once Figure 5 and Figure 6 Regarding the speaker 201 of the third embodiment shown, the basic structure of the speaker is similar to... Figure 4 The speaker 101 shown in the second embodiment is the same. In the cover member 13, a cover cone portion 13a is provided, whose diameter gradually increases with the rearward direction. The cover cone portion 13a and the cone portion of the vibrating plate 3 are positioned approximately parallel to each other. In the cover member 13, a recess 13c is formed closer to the central axis O than the edge member 4, that is, midway along the radial direction of the cover cone portion 13a. Furthermore, a central recess 13d is formed in the central portion. Figure 5 As shown, the recess 13c is formed along an arc trajectory centered on the central axis O, and the central recess 13d extends linearly in the diametrical direction through the central axis O. The pipe 14 is positioned offset from the central axis O. Furthermore, in the cover member 13, a raised portion 13b is formed at the boundary between the cover cone portion 13a and the central recess 13d, and the raised portion 13b is dome-shaped and faces rearward in a square manner, following the shape of the cover member 6.

[0087] like Figure 5 As shown, the locking end 13e of the recess 13c along the arc trajectory is away from the pipe 14, and the recess 13c is not directly connected to the pipe 14. On the side opposite to the side where the pipe 14 is located, which is sandwiched between the central axis O, the middle part of the arc-shaped recess 13c is connected to the central recess 13d. Furthermore, the central recess 13d is connected to the internal space of the pipe 14.

[0088] like Figure 6As shown, in the space 15 between the vibrating part 2 and the cover member 13, the front-to-back distance L1 between the recess 13c and the vibrating plate 3 widens, and the area where the recess 13c and the vibrating plate 3 face each other becomes the airflow path 16. Alternatively, the internal space of the recess 13c can be defined solely as the airflow path 16. The front-to-back distance L2 between the areas where the cover cone 13a, which is another part of the space 15, faces each other is narrower than L1, and the front-to-back distance between the areas where the ridge 13b faces each other is also equal to L2. The front-to-back distance L3 between the central recess 13d and the cover member 6, which is part of the vibrating part 2, also widens, and the area where the central recess 13d and the cover member 6 face each other becomes the central airflow path 116. Alternatively, the internal space of the central recess 13d can be defined solely as the central airflow path 116. In the space 15, the front-to-back distances widen in the order L2 < L1 < L3.

[0089] A radiator 33 is installed inside the central airflow path 116, close to the pipe 14. The circuit section 30 installed on the outer surface of the cover member 13 is connected to the radiator 33 in a thermally conductive manner.

[0090] In the loudspeaker 201 of the third embodiment, if the vibrating part 2 vibrates back and forth, the pressure change in the space 15 between the vibrating part 2 and the cover member 13, in the portion where the interval L2 between the cover cone portion 13a and the raised portion 13b is short, also increases, and the airflow is concentrated inside the airflow path 16 and the central airflow path 116, which are widely spaced in the front-to-back direction. Figure 6 As shown, on the outer periphery side of the recess 13c, the airflow generated by the pressure change between the conical portion of the vibrating plate 3 and the conical portion 13a is accelerated, primarily along the circumferential trajectory of the airflow path 16. On the inner periphery side of the recess 13c, the airflow generated by the pressure change between the conical portion of the vibrating plate 3 and the conical portion 13a is accelerated, along the circumferential trajectory of the airflow path 16 and the central airflow path 116.

[0091] Furthermore, the airflow along the arc-shaped airflow path 16, which is not directly connected to the pipe 14, accelerates the airflow velocity of the central airflow path 116. Through the relatively fast airflow of the central airflow path 116, the heat dissipation effect from the radiator 33 is improved.

[0092] (Fourth Implementation)

[0093] At once Figure 7 and Figure 8 Regarding the speaker 301 of the fourth embodiment shown, the basic structure of the speaker is similar to... Figure 5 and Figure 6The speaker 201 shown in the third embodiment is the same. In the speaker 301 of the fourth embodiment, the cover member 13 has a recess 13c formed on the outer periphery of the cover cone portion 13a, following an arcuate trajectory. A conduit 14 is provided at the center of the central axis O containing the cover member 13. A straight recess 13f is formed between the recess 13c and the conduit 14.

[0094] In the space 15 between the vibrating part 2 and the cover member 13, in the region where the outer peripheral portion 13c is formed, the front-rear distance L1 between the vibrating part 2 and the cover member 13 widens, and the space inside the recess 13c or the space opposite the recess 13c and the vibrating part 2 becomes an airflow path 16 along an arc trajectory. In the region where the straight recess 13f is formed, the front-rear distance L4 between the vibrating plate 3 and the cover member 13 widens, and the space inside the straight recess 13f or the space opposite the straight recess 13f and the vibrating plate 3 becomes a straight airflow path 216. The straight airflow path 216 extends from the outer peripheral side towards the center. The relationship between the distances L1, L4, and the front-rear distance L2 in the region where the cover cone portion 13a is provided widens in the order L2 < L1 < L4.

[0095] In the speaker 301 of the fourth embodiment, if the vibrating part 2 vibrates back and forth, the pressure change in the portion of the space 15 between the vibrating part 2 and the cover member 13 where the distance L2 between the cover cone portion 13a and the raised portion 13b is short increases, and the airflow velocity inside the airflow path 16 and the straight airflow path 216 with a wide distance in the front-to-back direction increases. In addition, the airflow in the airflow path 16 along the arc trajectory accelerates the airflow in the straight airflow path 216, and air enters and exits between the space 15 and the external space through the internal space of the pipe 14.

[0096] The circuit section 30 is located on the outside of the straight recess 13f, and the heat sink 33 is located in the straight airflow path 216. Therefore, the heat dissipation effect of the heat sink 33 is improved by the airflow in the straight airflow path 216.

[0097] The loudspeakers shown in the first to fourth embodiments of the present invention can also be used with the Y2 direction as the sound emission direction. For example, the loudspeaker is disposed in an exterior space of the vehicle, such as the engine compartment or luggage compartment, and fixed to the vehicle body. In this case, the Y2 direction of the loudspeaker faces the interior of the vehicle, and the duct 14 communicates with the interior space of the vehicle. If the diaphragm 3 of the loudspeaker vibrates in the Y1-Y2 direction, the sound pressure generated on the Y2 side of the diaphragm 3 is supplied to the interior of the vehicle from the space 15 between the vibrating part 2 and the cover member 13 through the interior space of the duct 14. In this mode of use, the heat dissipation effect of the circuit part 30 can also be improved by the flow of air in the airflow path.

Claims

1. A loudspeaker, characterized in that, The loudspeaker includes a vibrating section comprising a diaphragm and a voice coil, a magnetic circuit section that applies a magnetic field to the voice coil, and a support body that supports the vibrating section and the magnetic circuit section. A vibrating plate with a conical portion is provided in the vibrating section. The support includes a cover member that covers the vibrating part from one side of the vibration direction of the vibrating part, and a pipe that communicates the space between the vibrating part and the cover member with an external space further out than the cover member. In a portion of the area covered by the cover member, a cover cone portion is provided that is opposite to the cone portion and inclined in the same direction as the cone portion, and a recessed portion is provided that is recessed in a direction away from the vibration portion. The recessed portion is formed to be continuous with the cover cone portion and surround the center of the vibration portion at a position further away from the center of the cover cone portion than the center of the vibration portion. The interval in the vibration direction between the vibrating part in the recess and the cover member is wider than the interval in the tapered part of the cover. An airflow path is formed inside the recess, and the airflow path passes through the interior of the pipe. The circuit section located on the outside of the cover member and the heat sink exposed in the airflow path are connected in a manner that enables heat conduction.

2. The loudspeaker as described in claim 1, The airflow path is continuous around the central axis of the vibrating part, and the duct is positioned offset from the central axis.

3. The loudspeaker as described in claim 1, The duct is positioned off-center from the central axis of the vibrating element, and at least a portion of the airflow path passes through the central axis.

4. The loudspeaker as described in claim 1, The pipe is disposed on the central axis of the vibrating part, and the air flow path extends from the outer periphery of the vibrating part toward the central axis.

5. The loudspeaker as claimed in any one of claims 1 to 4, The radiator has a slot. The groove extends through the airflow path in the direction toward the pipe.

6. The loudspeaker as claimed in any one of claims 1 to 4, The circuit section has a circuit board fixed to the outer surface of the cover member and electronic components mounted on the circuit board. The heat sink is connected to the circuit section through an opening formed in the cover member.

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