JP2005198217A - Actuator for speaker and panel type speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel type speaker that can be downsized by providing a heat dissipating function to an actuator acting like a vibration source. <P>SOLUTION: In a speaker integrated liquid crystal display panel being the panel type speaker, a transparent plate for protecting a display screen and also acting like a digital signal is fitted to a front outer packaging cover to which a liquid crystal module is fixed. The actuator 2 is called an exciter, the magnetic circuit 17 of which comprises a yoke 7, a magnet 8, and a plate 9, and the voice coil 10 of which is supported around the plate 9 via a damper 11. A sub panel 12 at the tip of the voice coil 10 is adhered to the transparent plate, and a terminal 13 for leading an external input signal to the voice coil 10 is fitted to the yoke 7. The yoke 7 and the damper 11 are fitted to a frame 18 having a cooling fin 19, and the frame 18 is fixed to the front outer package cover. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a speaker actuator and a panel type speaker having the same.

  A very thin and flat panel type speaker has been developed as an alternative to the conventional cone type speaker. In particular, a panel-type speaker is useful as a sound generation unit of an information device such as a computer or a display device in order to prevent the speaker from increasing the size of the device. An example of such a panel type speaker is specifically proposed in Patent Documents 1 to 3 by British New Transducer Limited. The configuration will be briefly described below.

  The basic configuration of the panel type speaker disclosed in Patent Documents 1 to 3 and the like is such that an actuator is attached to a diaphragm. When the actuator is vibrated by being driven by the driving means, the vibration is resonated by the diaphragm and released to the outside. For example, in the configuration of a speaker-integrated liquid crystal display (SoundVu speaker: trademark) schematically shown in FIG. 8, magnetic circuits 117 are provided on both left and right sides of a flat transparent plate 101 for protecting the display screen of the liquid crystal module 106. One actuator 102 having the voice coil 110 is arranged symmetrically. The transparent plate 101 is attached to the front exterior cover 105 via a cushion sponge 103 and the actuator 102 via an actuator cushion sponge 104. The front exterior cover 105 has a hole that matches the screen display range of the liquid crystal module 106, and the liquid crystal module 106 is fixed inside thereof. The front exterior cover 105 is a structure that constitutes a display device, and functions as a speaker that generates sound by transmitting the vibration of the actuator 102 attached thereto to the transparent plate 101 serving as a vibration plate.

  Such a speaker-integrated liquid crystal display, which is an example of a panel-type speaker, uses a flat transparent plate (panel plate) 101 that protects a liquid crystal display screen as a diaphragm of the speaker. As a result, the liquid crystal display surface itself can be provided with a stereo speaker function, and the position of the sound source (speaker) where the sound source is displayed and the sound source (speaker) that actually produces sound are spatially matched. The person can feel the sound coming from the displayed video itself, and can realize a high sense of realism.

  In this speaker-integrated liquid crystal display, the mounting space of the actuator 102 is greatly affected in enhancing the design and space saving. To make this liquid crystal display more productive, the actuator 102 is reduced in size and performance. Development is needed to make it easier. Although not shown, the actuators 102 may be provided in pairs on the left and right sides of the transparent plate 101.

  FIG. 9 shows a specific configuration of a conventional typical actuator 102. Such an actuator 102 is generally called an exciter. The actuator 102 shown in FIG. 9 includes a magnetic circuit 117 including an iron yoke 107, a magnet 108, and a plate 109, and a voice coil 110 is held around the plate 109 via a damper 111. A sub-panel 112 is attached to the tip of the voice coil 110, and its surface is bonded to a transparent plate 101 (see FIGS. 8, 10, and 11) that is a diaphragm. Further, a terminal 113 that relays wiring for connecting an input signal from an external amplifier side to the voice coil 110 is attached to the yoke 107. The actuator 102 configured as described above generates sound by transmitting the vibration of the voice coil 110 to the transparent plate 101.

10 and 11 show the mounting structure of the actuator 102 shown in FIG. According to this, the yoke 107 on one end side of the actuator 102 is fixed to a structure such as the front exterior cover 105 or the internal frame via the cushion sponge 104, and the sub-panel 112 on the other end side is a transparent plate 101 that also serves as a screen protection plate. Etc. are fixed to a diaphragm. With this configuration, vibration generated by the voice coil 110 of the actuator 102 is transmitted to the diaphragm.
JP 2002-533957 A Special table 2002-510182 gazette Japanese translation of PCT publication No. 2002-511681 JP 2000-152380 A

  Since the actuator 102 such as the exciter vibrates in response to an input signal from the amplifier side when generating sound, the voice coil 110 generates heat due to the vibration. An increase in the amount of heat generated from the voice coil 110 due to downsizing and higher performance of the actuator 102 is inevitable. The conventional iron yoke 107 shown in FIG. 9 does not have a heat radiating function and does not have a good heat radiating property.

  Patent Document 4 discloses a cooling structure for a so-called external magnetic speaker, but an effective cooling structure for an internal magnetic speaker such as the actuator 102 (for example, an exciter) has not been proposed.

  Accordingly, an object of the present invention is to eliminate the problem of heat generation accompanying downsizing and high performance of an actuator used as a vibration source, that is, to make the actuator have a high heat dissipation function, thereby enabling further downsizing. An object of the present invention is to provide a speaker actuator and a panel type speaker having the same.

  Another object of the present invention is to provide a panel type speaker that efficiently transfers heat from the actuator and dissipates it without complicating the configuration, and prevents the actuator itself from accumulating heat. There is to do.

  A first feature of the present invention is that, in a speaker actuator having a voice coil and a magnetic circuit and serving as a vibration source, a frame having cooling fins is attached to a yoke constituting a part of the magnetic circuit. is there. According to this configuration, since the actuator itself has a heat dissipation effect, heat can be released without excessively raising the surface of the diaphragm and the inside of the apparatus. Since it is not necessary to leave a space around the actuator in order to avoid the influence of heat, it is possible to reduce the size of the apparatus and to achieve higher performance without worrying about the amount of heat generated. The yoke and the frame may be bonded with an adhesive. In that case, it is preferable to use an adhesive having low thermal resistance. The yoke and the frame may be fixed to each other by caulking. In this case, compared with the case where an adhesive is used, an adhesive application process and an adhesive drying process that requires time management are not necessary, and the processing time can be shortened and manufacturing is facilitated.

  The second feature of the present invention is that a speaker actuator having a voice coil and a magnetic circuit and serving as a vibration source, a diaphragm that resonates when vibration is transmitted from the voice coil, and a heat conductive sponge in contact with the actuator And a structure in which the actuator is attached via a heat conductive sponge. The thermal conductive sponge is an elastic body having a thermal conductivity of greater than 0.2 W / m · K, preferably an elastic body having a thermal conductivity of 0.6 W / m · K or more, more preferably a thermal conductivity of 0. Elastic body of 8 W / m · K or more. The heat conductive sponge may be made of a heat conductive silicon rubber.

  According to this configuration, the heat generated from the actuator is transmitted to the structure through the heat conductive sponge and dissipated, so that the temperature can be lowered without accumulating heat in the actuator itself. In addition, since the vibration of the actuator is not restricted by the heat conductive sponge, the vibration of the diaphragm can be maintained.

  The present invention is particularly effective when these speaker actuators are exciters.

  The panel-type speaker of the present invention includes the speaker actuator having the above-described configuration and a diaphragm that resonates when vibration is transmitted from a voice coil. It is preferable to further have a structure to which the actuator is attached. According to this configuration, the panel type speaker can be further reduced in size.

  This panel type speaker is an internal magnet type speaker. According to the present invention, it is possible to realize an effective cooling structure for an inner magnet type speaker that has not existed conventionally.

  In the present invention, in the case where the actuator is provided with cooling fins, the heat dissipation function of the actuator, which is the vibration source, is improved, and the following effects can be obtained.

  First, it is not necessary to open a space around the actuator in consideration of the influence of heat generated by the actuator, so that the mounting space can be reduced. This makes it possible to save space and not only reduce the size of the device, but also improve the design and increase the commercial value.

  Secondly, since the heat dissipation performance is improved, the inside of the apparatus does not become excessively high due to heat generated during sound generation. Accordingly, there is no need to use expensive parts with exceptionally high heat resistance, and the cost may be reduced. Further, since the actuator itself has a sufficient heat dissipation function, it is not necessary to provide a separate cooling member for the panel type speaker, and the cost can be reduced. For example, conventionally, it has been necessary to suppress the temperature rise on the surface of the diaphragm by joining the actuator and the diaphragm via a heat insulating sheet, but according to the present invention, the heat dissipation performance of the actuator itself is reduced. In order to improve, an additional cooling member such as a heat insulating sheet is unnecessary.

  Third, since the frame is included, the actuator can be handled and mounted without touching the moving parts such as the voice coil, so that problems such as damage during the mounting of the actuator are eliminated. Reliability is improved.

  Further, in the case where the actuator is attached to the structure via a heat conductive sponge, the following effects can be obtained.

  First, since the heat generated from the actuator is transmitted to the structure through the heat conductive sponge and dissipated, the actuator itself does not accumulate heat, and the temperature of the actuator can be lowered. In addition, when this structure is a component that a conventional panel-type speaker generally has, it does not hinder downsizing and weight reduction of the device.

  Second, since the actuator is attached to the structure via a heat conductive sponge, which is an elastic material, the vibration of the actuator is not constrained and the vibration of the diaphragm can be maintained, resulting in the sound quality of the speaker function. Leads to maintenance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic diagram showing the overall configuration of an example of a panel type speaker according to the first embodiment of the present invention. This panel-type speaker is a speaker-integrated liquid crystal display similar to the conventional example shown in FIG. That is, one actuator 2 having the magnetic circuit 17 and the voice coil 10 is arranged symmetrically on the left and right sides of the flat transparent plate 1 that protects the display screen of the liquid crystal module 6. The transparent plate 1 is attached to the front exterior cover 5 via the cushion sponge 3 and the actuator 2 via the actuator cushion sponge 4. The front exterior cover 5 has a hole in accordance with the screen display range of the liquid crystal module 6, and the liquid crystal module 6 is fixed inside thereof. The front exterior cover 5 is a structure that constitutes a display device, and functions as a speaker that generates sound by transmitting vibrations of the actuator 2 attached thereto to the transparent plate 1 serving as a vibration plate. Although not shown, a plurality of actuators 2 may be provided in pairs on the left and right sides of the transparent plate 1.

  A specific configuration of the actuator 2 of the present embodiment is shown in FIGS. The actuator 2 is generally called an exciter, and includes a magnetic circuit 17 composed of an iron yoke 7, a magnet 8, and a plate 9, and the voice coil 10 is held around the plate 9 via a damper 11. Has been. A sub-panel 12 is attached to the tip of the voice coil 10, and the surface thereof is bonded to the transparent plate 1 (see FIGS. 1 and 3) that is a diaphragm. Further, a terminal 13 that relays wiring for connecting an input signal from an external amplifier side to the voice coil 10 is attached to the yoke 7.

  In the present embodiment, the yoke 7 has a bottomed cylindrical shape (pan shape) rather than a conventional shape having a bowl-shaped portion (see FIGS. 9 and 10). The yoke 7 and the damper 11 are attached to the frame 18. The yoke 7 and the frame 18 are bonded using an adhesive 14 (see FIG. 3B) having a low thermal resistance such as a silicon adhesive. A plurality of cooling fins 19 extending from the attachment portion of the yoke 7 toward the attachment portion to the front exterior cover 5 (see FIGS. 1 and 3) as a structure are provided on both surfaces of the frame 18.

  As shown in FIGS. 1 and 3, the frame 18 of the actuator 2 is fixed to the front exterior cover 5, which is a structure, via a cushion sponge 4. The sub-panel 12 is fixed to the transparent plate 1 that is a diaphragm. The frame 18 is formed of a material having excellent thermal conductivity such as aluminum, and has a heat radiating function for releasing the heat of the yoke 7 to the outside in addition to a function of fixing to the front exterior cover 5. In the present embodiment, as described above, the yoke 7 having no hook-shaped portion is miniaturized, and the magnetic circuit 17 including the yoke 7, the magnet 8 and the plate 9 is miniaturized.

  In the actuator 2 having such a configuration, an input signal is supplied to the voice coil 10 via the terminal 13 from an external amplifier (not shown) or the like. In response to the input signal, the voice coil 10 vibrates, and the vibration is transmitted to the transparent plate 1 via the sub-panel 12. When the transparent plate 1 resonates, a relatively loud sound is emitted to the outside. On the other hand, heat generated by the vibration of the voice coil 10 is transmitted to the frame 18 through the yoke 7. This heat is radiated mainly from the cooling fins 19 of the frame 18 to the outside.

  As described above, since the transparent plate 1 necessary for protecting the liquid crystal display screen is used as a resonance panel member to function as a speaker having a sufficient volume, a thin panel type speaker can be configured. Furthermore, according to the present embodiment, the heat generated when the actuator 2 generates sound (vibration) is released from the cooling fins 19 of the frame 18 to the outside. The temperature of the battery is not excessively increased, and the obstacles to downsizing and high performance can be eliminated.

  The principal part of the modification of this embodiment is shown by FIG. In this modification, the yoke 7 and the frame 18 are fixed not by bonding with the adhesive 14 but by caulking. That is, by forming the yoke mounting portion of the frame 18 in a mortar shape and plastically deforming the tip portion 20 of the yoke 7 in accordance with the mortar shape of the frame 18 with the frame 18 and the yoke 7 overlapped, The yoke 7 and the frame 18 can be fixed so as not to be detached. According to this modification, the adhesive 14 for fixing the yoke 7 and the frame 18 is not necessary, and heat is efficiently transmitted from the yoke 7 to the frame 18 without being affected by the thermal resistance of the adhesive 14. And a high cooling effect can be easily obtained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is provided about the part similar to 1st Embodiment, and description is abbreviate | omitted.

  In recent years, it has been required to incorporate a speaker-integrated liquid crystal display, which is an example of a panel-type speaker, into a small terminal device such as a notebook personal computer as well as a simple display device. A small terminal device contains a large number of electronic devices other than a display, and since there is almost no vacant space and further downsizing is desired, a space for sufficiently dissipating heat is secured. Is difficult. Moreover, recently, it is desired that a miniaturized terminal device generate a sound pressure comparable to a simple display device. With such miniaturization and higher performance of the sound generation function, the amount of heat generated by an actuator (for example, an exciter) has increased, making it difficult to dissipate heat.

  In the present embodiment, the liquid crystal module 6 is located between the inner panel 21 and the frame plate 22, and the screen display range is a flat that further protects the liquid crystal display screen through the holes 21 a provided in the inner panel 21. It can be seen through the transparent plate 1. The actuators 23 are attached to the left and right ends of the lower portion of the transparent plate 1 through holes 21b provided in the internal panel 21. The transparent plate 1 is attached to the internal panel 21 via the cushion sponge 3. As shown in FIG. 6, the actuator 23 is sandwiched and held by the actuator cushion sponge 24 and the heat conductive sponge 25 at the outer peripheral portion (at a place other than the portion that directly contacts the transparent plate 1 and transmits vibration). The actuator cushion sponge 24 is attached to the inner panel 21 and the heat conductive sponge 25 is attached to the frame plate 22.

  The frame plate 22 has a function of securing the strength of the internal panel 21 and the liquid crystal module 6, and is a general component as a component configuration of a small terminal device such as a notebook personal computer. It is a structure substantially equivalent to the front exterior cover 5. In the present embodiment, the frame plate 22 has a function of radiating the heat transmitted from the heat conductive sponge 25 to the outside. That is, when the actuator 23 generates heat to make a sound, that is, to move the transparent plate 1 that is a diaphragm, this heat is transmitted to the frame plate 22 via the heat conductive sponge 25 and is dissipated from the frame plate 22 to the outside air. The The actuator 23 of this embodiment does not have the cooling fan 19, but the other configuration is the same as that of the actuator 2 (see FIG. 2) of the first embodiment, and the conventional actuator (FIG. 9). The same may be used.

  In general, in a configuration in which another component is brought into contact with the actuator 23 and the heat accumulated in the actuator 23 is allowed to escape to the other component, the vibration of the actuator 23 itself is constrained by the other component to form a diaphragm. There is a possibility that the vibration of the transparent plate 1 is lowered, and as a result, the sound quality of the speaker function is deteriorated. However, in the configuration of the present embodiment, the actuator 23 is sandwiched between the cushion cushion 24 for actuator, which is an elastic material, and the heat conductive sponge 25, so that the vibration of the actuator 23 itself is not constrained and heat is transferred to the frame plate 22. Can escape. In addition, providing a dedicated part for heat dissipation as another part for releasing the heat of the actuator 23 is a factor that hinders downsizing and weight reduction required for a small terminal device such as a notebook personal computer. In the present embodiment, since the frame plate 22 that is a general component that has been conventionally used is used for heat dissipation, it does not hinder downsizing and weight reduction. The frame plate 22 is preferably made of a material and a shape that exhibit a high heat dissipation effect.

  The heat conductive sponge is an elastic body having a low heat resistance and cushioning effect, such as heat conductive silicon rubber, and its heat conductivity must be at least greater than 0.2 W / m · K, preferably 0. .6 W / m · K or more, more preferably 0.8 W / m · K or more. The reason is that heat is transferred to the frame plate by a heat conductive sponge having a heat conductivity larger than that of general silicon rubber (0.2 W / m · K) which is not heat conductive. The effect of heat dissipation is obtained, and if the thermal conductivity is 0.6 W / m · K or more, it is practically quite effective, and if the thermal conductivity is 0.8 W / m · K or more, it is very large. This is because an effect can be obtained.

  As a first effect of the present embodiment, even if heat is generated so as to exceed the heat dissipation performance of the actuator 23 itself, the heat generated from the actuator 23 is transmitted to the frame plate 21 via the heat conductive sponge 25 to dissipate heat. Therefore, the actuator 23 itself does not accumulate (saturate) heat, and the temperature of the actuator 23 can be lowered.

  Further, as a second effect of the present embodiment, the actuator 23 is sandwiched between the cushion cushion 24 for actuator which is an elastic material and the heat conductive sponge 25, so that the vibration of the actuator 23 itself is not constrained and the diaphragm The vibration of the transparent plate 1 can be maintained, and as a result, the sound quality of the speaker function is maintained.

  Furthermore, as a third effect of the present embodiment, a frame plate 33 which is a general component having a function of ensuring the strength of the internal panel 21 and the liquid crystal module 6 without using a dedicated component for heat dissipation is used. Therefore, it does not hinder downsizing and weight reduction of the device.

  FIG. 7 shows an example in which the present embodiment is applied to a configuration in which the actuator 2 has the cooling fins 19 as in the first embodiment described above. In this configuration, a heat conductive sponge 25 is used instead of the actuator cushion sponge 4 (see FIGS. 1 and 2) of the first embodiment, and is fixed to the front exterior cover 5. In this case, the front exterior cover 5 is preferably made of a material and shape having a high heat dissipation effect, similar to the frame plate 22. In the case of this configuration, both the effects of the first embodiment and the effects of the second embodiment can be achieved.

Each of the above-described embodiments has a configuration having a vibration source generally called an exciter, but other actuators may be used as long as they can be used as a vibration source. The support structure of the diaphragm and the liquid crystal display module is not particularly limited, and can be arbitrarily changed.
Also, here, a speaker-integrated liquid crystal display has been described as an example of a panel-type speaker. However, the present invention is not limited to such a display device, but is applicable to any panel-type speaker having an actuator and a diaphragm (resonant panel member). Can be applied. Functions and uses other than the sound generation function and the detailed configuration are not limited at all.

It is a disassembled perspective view which shows the principal part of the panel type speaker of the 1st Embodiment of this invention. FIG. 1 is an exploded perspective view showing an actuator used in a panel type speaker. (A) is sectional drawing which shows the actuator attachment structure of the panel type speaker shown in FIG. 1, (b) is an expanded sectional view of the principal part. It is an expanded sectional view of the same part as Drawing 3 (b) showing the important section of the modification of the panel type speaker shown in FIG. It is a disassembled perspective view which shows the principal part of the panel type speaker of the 2nd Embodiment of this invention. It is a principal part expanded sectional view which shows the actuator attachment structure of the panel type speaker shown in FIG. It is sectional drawing which shows the actuator attachment structure of a panel type speaker which shows the example which applied the structure of 2nd Embodiment to the structure of 1st Embodiment. It is a disassembled perspective view which shows the principal part of an example of the conventional panel type speaker. It is a disassembled perspective view which shows the actuator used for the panel type speaker shown in FIG. It is sectional drawing which shows the actuator attachment structure of the panel type speaker shown in FIG. It is sectional drawing of the location different from FIG. 10 which shows the actuator attachment structure of the panel type speaker shown in FIG.

Explanation of symbols

1,101 Transparent plate (diaphragm)
2,23,102 Actuator (Exciter)
3,103 Cushion sponge 4,24,104 Cushion sponge for actuator 5,105 Front exterior cover (structure)
6, 106 Liquid crystal module 7, 107 Yoke 8, 108 Magnet 9, 109 Plate 10, 110 Voice coil 11, 111 Damper 12, 112 Sub panel 13, 113 Terminal 14 Adhesive 17, 117 Magnetic circuit 18 Frame 19 Cooling fin 20 Tip 21 inner panel 21a, 21b hole 22 frame board (structure)
25 Thermal conductive sponge

Claims (14)

In a speaker actuator having a voice coil and a magnetic circuit and serving as a vibration source,
A speaker actuator, wherein a frame having a cooling fin is attached to a yoke constituting a part of the magnetic circuit. The speaker actuator according to claim 1, wherein the yoke and the frame are bonded by an adhesive. The speaker actuator according to claim 1, wherein the yoke and the frame are fixed to each other by caulking. The speaker actuator according to any one of claims 1 to 3, wherein the speaker actuator is an exciter. The speaker actuator according to any one of claims 1 to 4,
A panel-type speaker having a diaphragm that resonates when vibration is transmitted from the voice coil. The panel type speaker according to claim 5, further comprising a structure to which the actuator is attached. The panel type speaker according to claim 6, wherein the actuator is attached to the structure via a heat conductive sponge. A speaker actuator having a voice coil and a magnetic circuit and serving as a vibration source, a diaphragm that resonates when vibration is transmitted from the voice coil, a heat conductive sponge in contact with the actuator, and the actuator A panel type speaker having a structure attached via a conductive sponge. The panel type speaker according to claim 8, wherein the actuator is an exciter. The panel type speaker according to any one of claims 7 to 9, wherein the thermal conductive sponge is an elastic body having a thermal conductivity of greater than 0.2 W / m · K. The panel-type speaker according to claim 10, wherein the thermal conductive sponge is an elastic body having a thermal conductivity of 0.6 W / m · K or more. The panel-type speaker according to claim 11, wherein the thermal conductive sponge is an elastic body having a thermal conductivity of 0.8 W / m · K or more. The panel type speaker according to any one of claims 7 to 12, wherein the heat conductive sponge is made of a heat conductive silicon rubber. The panel type speaker according to any one of claims 5 to 13, which is an internal magnet type speaker.

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