JP4436710B2 - Speaker device - Google Patents

Description

  The present invention relates to a bass-reflex type speaker device suitable for in-vehicle use and the like, and more particularly, to a heat dissipation measure for a speaker device incorporating an amplifier circuit.

  Conventionally, as shown in FIG. 10, a bass-reflex type speaker device is known in which a speaker unit 2, an amplifier circuit 3, a heat sink 4, and the like are disposed inside a housing 1 (see, for example, Patent Document 1). . The inside of the housing 1 is divided into two by a wall portion 5, and an opening 5 a is provided in the wall portion 5. The speaker unit 2 includes a diaphragm 7 supported by the frame 6, a voice coil (not shown) supported by the diaphragm 7, a magnetic circuit 8 that can drive the diaphragm 7 via the voice coil, and the like. The front side of the speaker unit 2 protrudes from the opening 5 a of the wall portion 5. The amplifier circuit 3 includes an output transistor and the like, and is electrically connected to the speaker unit 2. The amplifier circuit 3 is installed on a heat sink 4, and a bass reflex port 9 is defined between the heat sink 4 and the inner wall of the housing 1. The bass reflex port 9 is for guiding the air flow generated by the diaphragm 7 of the speaker unit 2 to the outside of the housing 1, and the overall length of the bass reflex port 9 is set to a predetermined length considering phase inversion. Has been.

  In the conventional speaker device schematically configured as described above, when an audio signal is input to the speaker unit 2 via the amplifier circuit 3, the voice coil of the speaker unit 2 is driven by the magnetic circuit 8 and the diaphragm 7 vibrates. Therefore, the air flow generated by the diaphragm 7 is guided to the bass reflex port 9 and released to the outside of the housing 1. In addition, the output transistor and the like of the amplifier circuit 3 generate heat when energized, and the heat radiating plate 4 is heated. Since the heat radiating plate 4 is exposed to the bass reflex port 9, it is cooled by air flowing through the bass reflex port 9. Is done. Therefore, the heat generated in the amplifier circuit 3 can be radiated using the air flow in the bass reflex port 9.

As another conventional technique, a small hole opened on the side surface of the bass reflex port is arranged in the vicinity of the amplifier circuit, so that the amplifier circuit is air-cooled by an air flow leaking from the small hole. Has been proposed (see, for example, Patent Document 2).
Japanese Unexamined Patent Publication No. 5-276588 (page 3, FIG. 1) JP-A-4-334636 (2nd page, FIG. 1)

  The heat dissipation countermeasure of the amplifier circuit in the conventional bass reflex type speaker device is, for example, the heat generated in the amplifier circuit 3 and conducted to the heat sink 4 as in the former conventional example shown in FIG. However, since a high-power speaker device generates a large amount of heat from the amplifier circuit 3, it cannot provide a sufficient heat dissipation effect, and the circuit element may be destroyed due to excessive temperature rise. There was sex. Similarly, the latter conventional example, in which the amplifier circuit is air-cooled by an air flow leaking from a small hole opened in the bass reflex port, is sufficiently radiated when applied to a high-power speaker device that generates a large amount of heat from the amplifier circuit. It is difficult to obtain an effect.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a highly reliable bass reflex speaker device capable of efficiently dissipating heat generated in an amplifier circuit. It is in.

  The present invention guides the airflow generated on the back side of the speaker unit and the airflow generated on the front side to the different bass reflex port and the horn by the vibration of the diaphragm, and is led from the speaker unit to the bass reflex port. By installing an amplifier circuit at a position adjacent to the air flow channel and the air flow channel guided to the horn, the air flow generated on the back side and front side of the speaker unit cools the amplifier circuit respectively. I was able to do it.

  In the bass reflex type speaker device according to the present invention, the air flow generated on the back side and the front side of the speaker unit by the vibration of the diaphragm can cool the amplifier circuit, respectively. It is possible to dissipate heat efficiently. Therefore, even when applied to a high-power speaker device that generates a large amount of heat from the amplifier circuit, an excessive temperature rise can be prevented and reliability is improved.

  In the speaker device of the present invention, a speaker unit in which a diaphragm supported by a frame can be driven by a magnetic circuit, an amplifier circuit electrically connected to the speaker unit, and the magnetic circuit exist in a housing. A bass reflex port for guiding an air flow generated on the back side of the speaker unit to the outside of the housing, and an air flow generated on the front side of the speaker unit without the magnetic circuit to the outside of the housing. And the amplifying circuit is installed at a position adjacent to the air flow path led from the back of the speaker unit to the bass reflex port and the air flow path led to the horn. .

  The bass reflex type speaker device configured in this way guides the air flow generated on the back side of the speaker unit and the air flow generated on the front side by the vibration of the diaphragm to the bass reflex port and the horn, respectively. Since the air flow path that is led from the back of the unit to the bass reflex port and the air flow that is led from the front of the speaker unit to the horn can be cooled by the air, the heat generated by the amplifier can be efficiently radiated. Can be expected, and an excellent heat dissipation effect can be expected. Therefore, even when applied to a high-power speaker device that generates a large amount of heat from the amplifier circuit, an excessive temperature rise can be suppressed, so that destruction of circuit elements due to heat can be prevented and high reliability can be obtained.

  In the above configuration, when all the windows except for the window adjacent to the amplifier circuit among the plurality of windows provided in the frame are closed, air generated on the back side of the speaker unit The back pressure can be increased by concentrating the flow on the window that is not closed. As a result, the flow rate of the air flow generated on the back side of the speaker unit can be increased and can greatly contribute to the air cooling of the amplifier circuit.

  Embodiments will be described with reference to the drawings. FIG. 1 is a plan view of a bass reflex type speaker device according to an embodiment of the present invention, FIG. 2 is a plan view showing an internal configuration of the upper case side of the speaker device, and FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 1, FIG. 5 is a cross-sectional view taken along line BB in FIG. 1, and FIG. FIG. 7 is a cross-sectional view taken along line D-D of FIG. 1, and FIG. 8 is a front view of the speaker device.

  The speaker device shown in these drawings includes a speaker unit 13, an amplifier circuit (amplifier circuit) 14, a control circuit 15, a port component 16, and a heat radiating plate 17 in a housing 10 formed by combining an upper case 11 and a lower case 12. And a cover 18 is attached to the opening end of the housing 10. The speaker unit 13 includes a frame 19 having a plurality of windows 19a, a diaphragm 20 supported by the frame 19, a voice coil (not shown) supported by the diaphragm 20, and a voice coil. A magnetic circuit 21 or the like that can drive the diaphragm 20 is provided. The magnetic circuit 21 includes a yoke 21a having a center pole, and an annular plate 21c for forming a magnetic gap between the annular magnet 21b and the center pole.

  The upper case 11 and the lower case 12 are made of a metal material having excellent thermal conductivity such as aluminum die casting. As shown in FIGS. 5 and 6, a part of the upper case 11 (heat sink portion 11a) and a synthetic resin are used. A bass reflex port 22 is defined by the port component 16. The bass reflex port 22 extends along a curved path adjacent to the outer peripheral surface of the magnetic circuit 21, and the heat sink portion 11a constituting the ceiling portion of the bass reflex port 22 and the port component 16 constituting the remaining portion are both flat. It is formed in a J-shape as viewed and is arranged close to the magnetic circuit 21 (see FIG. 2). The bass reflex port 22 guides the air flow generated on the back side of the speaker unit 13 (the side where the magnetic circuit 21 exists) by the vibration of the diaphragm 20 to the first opening 23 of the housing 10 and releases it to the outside. Is for.

  The amplifier circuit 14 and the control circuit 15 are electrically connected to the speaker unit 13, and a heating element such as an output transistor is disposed in the amplifier circuit 14, so that the amplifier circuit 14 is made of aluminum having a high thermal conductivity. It is installed on a heat radiating plate 17 made of, for example. Therefore, the heat generated by the heating element such as the output transistor is transmitted to the heat radiating plate 17. A horn 24 is defined between the heat radiating plate 17 and the inner wall of the lower case 12. The horn 24 guides the air flow generated on the front side of the speaker unit 13 (the side where the magnetic circuit 21 does not exist) due to the vibration of the diaphragm 20 to the second opening 25 of the housing 10 and releases it to the outside. Is for.

  As shown in FIGS. 2 to 4, an air flow (indicated by an arrow P) generated on the back side of the speaker unit 13 by the diaphragm 20 passes through the amplifier circuit 14 and is guided into the bass reflex port 22. Since the air flow P is directed to the first opening 23, the heating element of the amplifier circuit 14 is directly air-cooled. Further, the air flow (indicated by arrow R) generated on the front side of the speaker unit 13 by the diaphragm 20 and guided into the horn 24 is directed to the second opening 25 while cooling the heat radiating plate 17. The amplifier circuit 14 is also air-cooled by this air flow R.

  2 and 3, the port component 16 and the control circuit 15 are screwed and fixed to the upper case 11, and the speaker unit 13, the amplifier circuit 14 and the heat radiating plate 17 are fixed to the lower case 12 by screws. Has been.

  In the speaker device configured as described above, when an audio signal is input to the speaker unit 13 via the amplifier circuit 14, the voice coil of the speaker unit 13 is driven by the magnetic circuit 21 and the diaphragm 20 vibrates. An air flow generated by the diaphragm 20 is guided to the first and horns 22 and 24 and discharged to the outside of the housing 10.

  Further, in the speaker device according to the present embodiment, although the output transistor of the amplifier circuit 14 generates heat and the temperature rises when energized, the air generated on the back side of the speaker unit 13 due to the vibration of the diaphragm 20. Since the flow cools the amplifier circuit 14 and is guided to the bass reflex port 22 toward the first opening 23, the air flow P can suppress the temperature rise of the amplifier circuit 14. Moreover, the air flow generated on the front side of the speaker unit 13 due to the vibration of the diaphragm 20 is guided to the horn 24, and the air flow R that air-cools the amplifier circuit 14 through the heat radiating plate 17 to the second opening 25. Therefore, the temperature rise of the amplifier circuit 14 can also be suppressed by this air flow R. Therefore, the heat generated in the amplifier circuit 14 is efficiently radiated by these air flows P and R, and an excessive temperature rise can be suppressed even when the amount of heat generated from the amplifier circuit 14 is large. Yes.

  In the speaker device according to the present embodiment, the space around the magnetic circuit 21 in the housing 10 is effectively used, and the bass reflex port 22 is along a curved path that surrounds the magnetic circuit 21 by 180 °. Therefore, the bass reflex port 22 can be secured to a sufficient length without deteriorating the space factor. Therefore, a sufficiently long bass reflex port 22 can be easily arranged in a limited space in the housing 10, and the speaker device can be easily downsized. Moreover, the ceiling portion of the bass reflex port 22 is a heat sink portion 11a of the upper case 11 made of aluminum die casting, and since this heat sink portion 11a is disposed adjacent to the outer peripheral surface of the magnetic circuit 21, it is generated in the magnetic circuit 21. Heat can be dissipated through the heat sink portion 11a.

  That is, since the speaker device according to the present embodiment is configured to increase the heat dissipation effect for the amplifier circuit 14 and to increase the heat dissipation effect for the magnetic circuit 21, there is a risk that the temperature in the housing 10 excessively increases. Is decreasing. As a result, circuit elements can be prevented from being destroyed by heat, reliability is improved, and high heat resistance is not required for a voice coil or the like, which makes it easy to reduce costs.

  In the speaker device according to the present embodiment, the case 10 is configured by combining the upper case 11 and the lower case 12, so that it is not necessary to complicate the mold shapes of the cases 11 and 12. But it is advantageous for cost reduction. Further, since the speaker device according to the present embodiment is partially curved along the curved portion of the bass reflex port 22, that is, along the outer peripheral surface of the magnetic circuit 21, the speaker device according to the present embodiment is also small in this respect. It is advantageous to make. The angle range in which the bass reflex port 22 surrounds the magnetic circuit 21 is preferably 90 ° or more from the viewpoint of reducing the size (reducing the capacity of the housing 10) by curving the corners of the outer shape of the housing 10. However, if only the heat dissipation of the magnetic circuit is taken into consideration, the angle range may be smaller, and the heat dissipation effect can be enhanced even at 30 ° to 90 °.

  FIG. 9 is a plan view showing the internal structure of the lower case side of a bass reflex type speaker device according to another embodiment of the present invention, and parts corresponding to those in FIG.

  In the speaker device shown in FIG. 9, among the plurality of windows provided in the frame 19 of the speaker unit 13, all windows except for the window 19 a adjacent to the amplifier circuit 14 are closed by appropriate means. This is different from the previous embodiment. As a result, the air flow generated on the back side of the speaker unit 13 can be concentrated on the window portion 19a that is not closed and the back pressure can be increased. The flow rate can be increased to greatly contribute to the air cooling of the amplifier circuit 14, and the heat dissipation effect can be further enhanced.

It is a top view of the bass-reflex type speaker apparatus which concerns on the Example of this invention. It is a top view which shows the internal structure of the upper case side of this speaker apparatus. It is a top view which shows the internal structure of the lower case side of this speaker apparatus. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is sectional drawing which follows the DD line | wire of FIG. It is a front view of the speaker device. It is a top view which shows the internal structure of the lower case side of the bass-reflex type speaker apparatus which concerns on the other Example of this invention. It is explanatory drawing which shows the bass-reflex type speaker apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing | casing 11 Upper case 11a Heat sink part 12 Lower case 13 Speaker unit 14 Amplifier circuit 15 Control circuit 16 Port part 17 Heat sink 18 Cover 19 Frame 19a Window part 20 Diaphragm 21 Magnetic circuit 22 Bass reflex port 23 1st opening part 24 Horn 25 second opening

Claims (1)

A speaker unit in which a diaphragm supported by a frame can be driven by a magnetic circuit, an amplifier circuit electrically connected to the speaker unit, and a rear side of the speaker unit in which the magnetic circuit exists A bass reflex port for guiding the generated air flow to the outside of the housing and a horn for guiding the air flow generated on the front side of the speaker unit without the magnetic circuit to the outside of the housing are provided. The amplifying circuit is installed at a position adjacent to the air flow channel led from the back surface of the speaker unit to the bass reflex port and the air flow channel led to the horn, and is opened in the frame. A speaker device characterized in that all windows other than the window adjacent to the amplifier circuit among the plurality of windows are closed.

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