JP6433172B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device having a structure in which a voice coil wound around a bobbin is disposed in a gap of a magnetic circuit.

  Conventionally, a speaker device disclosed in Patent Document 1 is known. This speaker device is characterized in that an outer peripheral wall that houses a magnetic circuit including a magnet, a yoke, and the like is formed in a streamlined and curved shape. When the air existing on the back side flows to the diaphragm side, the air resistance in the vicinity of the outer peripheral wall of the magnetic circuit housing portion can be reduced. Thereby, the flow of air becomes smooth, the deterioration of sound quality can be prevented, and the heat radiation from the outer peripheral wall can be promoted.

JP 2006-229520 A

  The heat source for radiating heat from the outer peripheral wall is a voice coil located in a gap formed in the magnetic circuit, and the heat generated by energizing the voice coil passes through the yoke from the magnetic circuit housing portion to the internal space of the speaker device. Heat is dissipated.

  However, since the voice coil is arranged in the gap so that it does not touch the yoke directly, the air between it and the yoke functions as a heat insulating layer, and the heat generated by the voice coil is transferred to the outer periphery of the magnetic circuit housing part. The heat cannot be efficiently radiated from the wall. If the voice coil is overheated above a predetermined temperature, the voice coil may be disturbed and the speaker device may be damaged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a speaker device having a structure capable of efficiently dissipating heat generated in a voice coil.

A speaker device according to the present invention includes a case body, a magnetic circuit fixed inside the case body, a voice coil wound around a cylindrical bobbin and disposed in a gap formed in the magnetic circuit, A diaphragm having an inner peripheral edge connected to the bobbin and an outer peripheral edge connected to the case body so as to partition the inside of the case body, and a part of the voice coil Is located outside the gap, and the case body is connected to the inside of the case body partitioned by the diaphragm so that the inside on the side where the magnetic circuit is provided communicates with the outside of the case body. A port portion having a diameter smaller than that of the diaphragm is formed to project outward from the opening and the periphery of the opening, and at least a part of the magnetic circuit is covered with the port portion. Structure It is.

According to such a configuration, since a part of the voice coil is provided outside the gap, the heat generated in the voice coil in the gap is radiated from the yoke through the air layer in the gap. In addition, it can radiate heat directly from the voice coil located outside the gap to the surrounding air, and touch the air that is circulated by the vibration of the diaphragm, so the cooling effect of the speaker device including the voice coil, magnetic circuit, etc. improves. Further, the case body is formed with an opening portion and a port portion projecting outward from the periphery of the opening portion so that the inside of the case body on the side where the magnetic circuit is provided communicates with the outside of the case body. The outside air can be taken in from the opening of the case body to the inside where the magnetic circuit is provided by the vibration of the diaphragm, radiating heat from the voice coil portion located outside the gap, and cooling the speaker device The effect can be further improved. Furthermore, since at least a part of the magnetic circuit is covered with the port portion, it is possible to obtain a cooling effect for the voice coil located outside the gap.

  In the speaker device according to the present invention, a part of the voice coil may be located outside the gap when the voice coil is energized.

  According to such a configuration, when the voice coil is energized, a part of the voice coil is located outside the gap. Therefore, when the heat is generated from the voice coil by energization, the voice coil always has a part around the outside of the gap. The heat can be directly radiated to the air, and the cooling effect of the entire speaker device is further improved by the air flowing through the vibration of the diaphragm.

  In the speaker device according to the present invention, the diaphragm may be connected to the bobbin such that the inner peripheral edge protrudes on the opposite side to the magnetic circuit.

  According to such a configuration, since the inner peripheral edge of the diaphragm protrudes to the opposite side of the magnetic circuit, the diaphragm and the bobbin become a space that intersects at an acute angle, compared to the case where they intersect at an obtuse angle, Since the air flow caused by the vibration of the diaphragm directly hits a part of the voice coil located outside the gap, the cooling effect of the speaker device is further improved.

In the speaker device according to the present invention, the area of the opening is not more than ½ of the area of the diaphragm .

According to such a configuration , the cooling effect can be expected when the area of the opening is set to ½ or less of the area of the diaphragm.

  According to the speaker device of the present invention, since a part of the voice coil is located outside the gap, the heat generated in the voice coil in the gap is not only radiated from the yoke via the air layer but also outside the gap. Can directly radiate the air in the surrounding space outside the gap from the portion of the voice coil located in the space, and further touch the air flowing through the vibration of the diaphragm, so that the cooling effect of the speaker device including the voice coil can be improved. .

It is sectional drawing which shows the cross-section of the speaker apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the flow of the external air in an apparatus for cooling of the speaker apparatus shown in FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  A speaker device according to an embodiment of the present invention is configured as shown in FIG.

  As shown in FIG. 1, the speaker device 11 includes a box-shaped first case body 12 and a second case body 13 each having a substantially circular bottom portion and a wall portion rising from the periphery of the bottom portion. It has a case body 15 that locks end edges to form an internal space. In the center of the bottom portion of the first case body 12, a port portion 16 having a circular opening portion 16a and a wall portion 16b protruding outward from the periphery of the opening portion is formed. A circular opening 17 is formed at the center of the bottom of the second case body 13.

  A cylindrical outer yoke 21 having a bottom on the side of the opening 16 is fixed to a substantially center of the opening 16a of the port 16 by a fixture 20 provided on the wall 16b of the port 16 at a predetermined pitch. . The fixture 20 is a substantially L-shaped mounting piece, and a plurality of fixtures 20 attach and fix the outer yoke 21 to the wall portion 16b at a predetermined interval. Thereby, the outer yoke 21 is fixed in a state where the bottom side is located in the port portion 16.

  Inside the outer yoke 21, a plate 22, a magnet 23, and an inner yoke 24 are stacked in that order from the bottom, and a gap is formed between the plate 22, the magnet 23, the inner yoke 24, and the outer yoke 21. 26 is formed. The outer yoke 21, the plate 22, the magnet 23 and the inner yoke 24 constitute a magnetic circuit 25.

  Inside the case body 15 is a diaphragm 31 made of conical cone paper or the like having a circular opening at the top, and the edge portion 31 provided on the outer peripheral edge thereof is provided with the first case body 12 and the second case body 13. At the position where the end edges of the two are engaged with each other, they are fixed while being sandwiched between them. The diaphragm 31 is arranged in such a manner that the top portion forming the opening portion of the diaphragm 31 protrudes toward the opening portion 17 side of the second case body 13, which is opposite to the magnetic circuit 25, by fixing at the above-described position. Has been. Therefore, the diaphragm 31 is provided such that the top portion including the inner peripheral edge portion protrudes to the side opposite to the magnetic circuit 25 rather than the outer peripheral edge portion. The inside of the case body 15 is partitioned by the diaphragm 31 into a first space 35a on the first case body 12 side and a second space 35b on the second case body 13 side. Further, a damper 32 which is a member such as a synthetic resin or a cloth formed in a ring shape having a circular opening in the center is fixed to the outer periphery of the opening 17 of the second case body 13. .

  In the gap 26 formed in the magnetic circuit 25, a cylindrical (cylindrical) bobbin 28 having a circular cross section around which a voice coil 27 is wound is disposed at one end side, and the voice coil 27 is disposed at a predetermined position in the gap 26. To be inserted. The voice coil unit 29 is constituted by the voice coil 27 and the bobbin 28. To the other end of the bobbin 28, the inner peripheral edge (the edge of the opening) of the diaphragm 31 and the inner peripheral edge (the edge of the opening) of the damper 32 are fixed. Thus, the inner peripheral edge portions of the voice coil unit 29 and the diaphragm 31 are elastically supported by the damper 32 so that they can vibrate in the axial direction (longitudinal direction) of the bobbin 28.

  The voice coil unit 29 is elastically supported by the damper 32 so as to be able to vibrate in the axial direction of the bobbin 28, and a part of the voice coil 27 is always a gap during energization of the voice coil 27 where the vibration occurs. 26 so as to be located outside of 26. A portion of the voice coil 27 located outside the gap 26 is placed at a position where it directly contacts the air in the first space 35 a partitioned by the first case body 12 and the diaphragm 31.

  A filter 37 is attached to a front end opening portion of the port portion 16 provided in the first case body 12, and the outside air taken into the first space 35a is removed by a filter. In addition, a terminal 41 that is electrically connected to the outside of the speaker device 11 is provided on the outer surface of the first case body 12, and the lead wire 42 that is connected to the voice coil 27 extends from the first space 35 a to the first. The case body 12 is penetrated and connected to the terminal 41.

  A lid-like cap 38 is fixed to the tip of the other end side opposite to the one end side of the bobbin 28 around which the voice coil 27 is wound, thereby sealing the inside of the bobbin 28. Further, in order to seal the opening 17 of the second case body 13, a lid-like cover member 39 is fixed to the outer surface of the second case body 13 so as to cover the entire opening 17.

  Next, the operation of the speaker device 11 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is an explanatory diagram showing the flow of outside air in the apparatus when the speaker apparatus 11 is in operation (at the time of vibration due to energization).

  As shown in FIG. 2, in the speaker device 11, when a current according to the sound signal flows through the voice coil 27 via the terminal plate 41 and the lead wire 42, the current flowing through the voice coil 27 and the gap 26 of the magnetic circuit 25 The voice coil unit 29 (the voice coil 27 and the bobbin 28) vibrates in the axial direction (longitudinal direction) of the bobbin 28 and is further fixed to the end of the bobbin 28 by electromagnetic action with the magnetic field formed on 31 also vibrates in the axial direction of the bobbin 28 (direction F shown in FIG. 2) and emits a predetermined sound.

  The vibration in the axial direction (longitudinal direction) of the bobbin 28 by the diaphragm 31 causes the flow of outside air from the opening 16a of the port portion 16 provided in the first case body 12 in addition to the generation of sound according to the electrical signal. (Indicated by broken line B in FIG. 2). When the diaphragm 31 swings toward the second case body 13, a pressure drop occurs in the first space 35 a partitioned by the diaphragm 31, and outside air is taken in from the opening 16 a of the port portion 16 (broken line B in FIG. 2). When the diaphragm 31 swings toward the first case body 12, the pressure in the first space 35 a increases, and the air in the first space 35 a is transferred to the opening 16 a of the port portion 16. To discharge from. Accordingly, the vibration of the diaphragm 31 causes the first space 35a to actively flow through the opening 16a of the port portion 16 through exchange with the outside air.

  In particular, as described above, the diaphragm 31 of the present embodiment has a top portion where the opening (inner peripheral edge) of the diaphragm 31 is formed on the opposite side of the magnetic circuit 25. Since it is arranged so as to protrude toward the opening 17 side, the angle between the diaphragm 31 and the peripheral wall of the bobbin 28 is an angle smaller than 90 ° (acute angle), and an angle larger than 90 ° (obtuse angle). In comparison, since the first space 35a is a narrow space, the first space 35a is susceptible to a pressure change due to the vibration of the diaphragm 31, and the air circulation speed due to the vibration increases. Air (outside air) that has flowed into the first space 35a from the outside through the opening 16a of the port portion 16 can directly touch the magnetic circuit 25 and the voice coil unit 29 as shown in FIG. Shows the flow path of outside air). In particular, in the space in the vicinity where the diaphragm 31 and the voice coil unit 29 are connected, the outside air that has flowed in loses its place and is easily affected by the vibration of the diaphragm 31, and the voice coil 27 positioned outside the gap 26. You will be touching directly.

  Therefore, when the voice coil 28 is energized, that is, when the diaphragm 31 vibrates, a part of the voice coil 28 is located outside the gap 26, so that the voice coil 28 serving as a heat source is outside the gap 26. Since the portion located at the position can directly contact the outside air flowing through the vibration of the diaphragm 31, heat radiation is promoted more than the portion located within the gap 26. The heat generated in the voice coil 28 located in the gap 26 is transferred to the outer yoke 21 through the air layer in the gap 26 and radiated from the outer yoke 21 into the first space 35a. Since the outer surface of the yoke 21 is also in contact with the outside air flowing from the opening 16a of the port portion 16, the heat radiation effect is improved.

  About the jet average velocity Vp in the first space 35a of the outside air described above, the area Sd of the diaphragm 31, the cross-sectional area Sp of the opening 16a of the port portion 16, and the average vibration velocity Vd of the diaphragm 31 are There is a relationship of Vp = Sd ÷ Sp × Vd (abbreviated as “Sd / Sp * Vd” where appropriate). Although the cooling effect increases as the jet average velocity Vp is maximized, the noise increases as the jet velocity increases and the so-called S / N ratio deteriorates. Therefore, the jet average velocity Vd is limited by the S / N ratio. Although it is considered that the distance between the magnetic circuit 25 and the port portion 16 is affected in order to use the jet flow due to the outside air for cooling, if the jet average velocity Vd is about twice the average vibration velocity Vd of the diaphragm 31, the cooling effect is obtained. Therefore, Sd / Sp is set to be twice or more.

  In the present embodiment, when the voice coil 27 is energized, a part of the voice coil 27 is located outside the gap 26, so that when the voice coil 27 generates heat, a part of the voice coil 27 is passed by the vibration of the diaphragm 31. Heat can be radiated by directly touching the outside air flowing, and in addition to heat radiation from the magnetic circuit 25, the cooling effect by heat radiation of the speaker device as a whole can be improved.

  In the present embodiment, when the voice coil 27 is energized (when the diaphragm 31 vibrates), a part of the voice coil is provided outside the gap 26. The ratio of the portion to the entire voice coil 27 can be determined in consideration of the heat radiation efficiency, the influence on the sound quality of the speaker device 11, and the like. Further, the diaphragm 31 is arranged so that the top of the conical shape protrudes on the side opposite to the magnetic circuit 25. However, as described above, the intake of the outside air due to the vibration of the diaphragm 31 is more effectively performed. To do. Even if the top portion of the diaphragm 31 is protruded toward the magnetic circuit 25, the voice coil 27 is provided so that a part of the voice coil 27 is located outside the gap 26. A cooling effect can be obtained.

  Further, in the present embodiment, since the entire magnetic circuit 25 is covered with the port portion 16 provided in the first case body 12, the outside air flows through the entire magnetic circuit 25 and the voice coil unit 29 to promote the cooling effect. However, even when a part of the magnetic circuit 25 is covered with the port portion 16, the voice coil 27 is provided so that a part of the voice coil 27 is located outside the gap 26, so that a predetermined cooling effect can be obtained. it can.

  As described above, the speaker device according to the present invention can directly radiate the heat generated in the voice coil to the air around the gap and can improve the cooling effect of the voice coil. It is useful as a heat dissipation structure for an excellent dynamic speaker device.

DESCRIPTION OF SYMBOLS 11 Speaker apparatus 12 1st case body 13 2nd case body 15 Case body 16 Port part 16a Opening part (port part)
16b Wall part 17 Opening part (2nd case body)
21 outer yoke 22 plate 23 magnet 24 inner yoke 25 magnetic circuit 26 gap 27 voice coil 28 bobbin 29 voice coil unit 31 diaphragm 32 damper 38 cap 39 cover member

Claims (4)

The case body,
A magnetic circuit fixed inside the case body;
A voice coil wound around a cylindrical bobbin and disposed in a gap formed in the magnetic circuit;
A diaphragm device having an inner peripheral edge connected to the bobbin and an outer peripheral edge connected to the case body so as to partition the inside of the case body,
A portion of the voice coil is located outside the gap;
From the inside of the case body partitioned by the diaphragm, the inside of the case body and the outside of the case body communicate with the inside of the side on which the magnetic circuit is provided from the periphery of the opening. A speaker device, wherein a port portion having a diameter smaller than that of the diaphragm is formed to protrude outward, and at least a part of the magnetic circuit is covered with the port portion.   The speaker device according to claim 1, wherein a part of the voice coil is located outside the gap when the voice coil is energized.   The speaker device according to claim 1, wherein the diaphragm is connected to the bobbin such that the inner peripheral edge protrudes on a side opposite to the magnetic circuit.   The speaker device according to any one of claims 1 to 3, wherein an area of the opening is ½ or less of an area of the diaphragm.

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