JP2000217185A - Cone speaker unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a speaker unit provided with a light emitting means that is made to emit light, accompanying changes in a sound volume. SOLUTION: This cone speaker unit consists of a cone-type diaphragm 11, a frame 18 that supports the cone-type diaphragm 11 via an edge 12, a voice coil 15 fitted to the circumferential edge of a center hole 13 at the base of the cone-type diaphragm 11, a damper 21 that supports the voice coil 15 retractively with respect to the frame 18, a magnet 27 surrounding the voice coil 15 and a base 23 to which the magnet 27 and the frame 18 are fixed. An LED circuit 28 is connected in parallel with the voice coil 15 and is placed on an LED fixing base 26 of a base 23 and an LED 31 is so arranged, that it can be viewed through the center hole 13 of the cone type diaphragm 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit for converting an electric signal into a sound wave in a sound reproducing device.

[0002]

2. Description of the Related Art A sound reproducing apparatus uses a sound source (radio, CD, etc.).
Etc.) to reproduce an electrical signal based on the sound information as faithfully as possible. To the last, it was important for a sound reproducing device to listen to music or the like with good sound. At this time,
Since the reproduced sound reaches the listener from the speaker unit of the sound reproducing device, the listener pays attention to the speaker unit which is the source of the sound even above, especially the cone type diaphragm which is the source of the sound in the case of the cone type speaker unit. . Therefore, the cone-shaped speaker unit should be able to increase the listener's concentration on the music and double the pleasure of listening to the music by applying a device that gives a visual stimulus mainly to the cone-shaped diaphragm. is there.

[0003]

However, conventionally, the speaker unit has been devised only to some extent in shape, color and the like, and has not been sufficiently devised to give a visual stimulus to the listener. The present invention has been made by paying attention to such problems existing in the conventional technology. An object of the present invention is to provide a speaker unit provided with a light emitting unit that emits light in response to a change in volume.

[0004]

Means for Solving the Problems To solve the above problems, according to the invention of claim 1, a cone-shaped diaphragm, a frame supporting the cone-shaped diaphragm via an edge, and a cone-shaped diaphragm A voice coil attached to the periphery of the center hole of the base, a damper for supporting the voice coil with respect to the frame so as to be able to advance and retreat, a magnet surrounding the voice coil, and a base to which the magnet and the frame are fixed. A cone type speaker unit having an LED circuit connected in parallel to the voice coil;
The gist of the invention is that LEDs of the ED circuit are installed on the base and in a region surrounded by the voice coil so that the LEDs can be viewed through the center hole of the cone-shaped diaphragm.

With this configuration, when a voice current flows through the voice coil, an electromagnetic induction action (a so-called left-hand rule) occurs.
As a result, the voice coil moves in a direction orthogonal to the magnetic flux. This movement causes the cone-shaped diaphragm to vibrate, generating sound waves and sounding. At this time, part of the audio current is diverted to the LED circuit to cause the LED to emit light. When the sound current increases, the vibration amount (amplitude) of the cone-shaped diaphragm also increases, and a loud sound is generated. However, when the sound current increases, the shunt current also increases, so the light emission amount also increases. Since the LED circuit is installed on the base, it does not vibrate even if the cone-shaped diaphragm vibrates. LED
Since the circuit is installed on the base surrounded by the voice coil, the LEDs can be viewed from the front of the speaker unit, that is, from the direction directly opposite to the center hole.

According to the second aspect of the present invention, a cone-shaped diaphragm and a frame supporting the cone-shaped diaphragm via an edge are provided.
A voice coil attached to the periphery of the center hole of the cone-shaped diaphragm base, a damper for supporting the voice coil with respect to the frame so as to be able to advance and retreat, a magnet surrounding the voice coil, the magnet and the frame A cone-type speaker unit having a fixed base,
A power generating coil that vibrates in synchronization with the vibration of the cone-shaped diaphragm is arranged in a magnetic field surrounded by the magnet, an LED circuit is connected to the power-generating coil, and an LED of the LED circuit is connected to the cone-shaped diaphragm. The gist of the present invention resides in that it is installed in an area on the base and surrounded by the voice coil so as to be visible through the center hole.

With this configuration, when a voice current flows through the voice coil, an electromagnetic induction action (a so-called left-hand rule) occurs.
As a result, the voice coil moves in a direction orthogonal to the magnetic flux. This movement causes the cone-shaped diaphragm to vibrate, generating sound waves and sounding. At this time, the vibration of the cone-shaped diaphragm reverses the magnetic flux of the power generation coil in the magnetic field of the magnet, so that an electromotive force (current) is generated by the electromagnetic induction action (the so-called right-hand rule) and flows to the LED circuit to emit the LED. Let it. As the sound current increases, the vibration amount (amplitude) of the cone-shaped diaphragm also increases, and accordingly, the magnetic flux cut by the power generation coil per unit time also increases. Therefore, the light emission amount also increases. Since the LED circuit is installed on the base, it does not vibrate even if the cone-shaped diaphragm vibrates. LED
Since the circuit is installed on the base surrounded by the voice coil, the LEDs can be viewed from the front of the speaker unit, that is, from the direction directly opposite to the center hole.

[0008]

According to the first and second aspects of the present invention, the LED of the LED circuit provided adjacent to the speaker unit emits light while changing the luminous intensity in response to the change in the audio current, so that the user can listen to music emitted from the speaker unit. A person can enjoy not only music but also light that matches the music, and it is possible to obtain stimulation from both hearing and vision. Furthermore,
Since the LED is not on the cone-shaped diaphragm but on the base, it is less susceptible to aging due to vibration of the cone-shaped diaphragm.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments in which the present invention is applied to a cone type speaker unit will be described with reference to FIGS.
It will be described based on. In this embodiment, “front” refers to the upper side in FIGS. 2 and 4, and “rear” refers to the lower side in FIGS. 2 and 4. (Embodiment 1) As shown in FIGS. 1 and 2, the cone diaphragm 11 is a cone (cone) diaphragm which is formed by expanding toward the front. It is made of reinforced paper coated with resin. A flexible edge 12 made of synthetic rubber is formed around the distal end of the cone-shaped diaphragm 11. A circular center hole 13 is formed in the center back portion of the cone-shaped diaphragm 11. A cylindrical bobbin 14 protrudes rearward from the periphery of the center hole 13. A voice coil 15 is wound around the outer periphery of the bobbin 14. Voice coil 15
The two first lead wires 16 that are energized to the first conductor 16 are guided from the center hole 13 to the surface of the cone-shaped diaphragm 11 and extend outward through the cone-shaped diaphragm 11. Edge 12 and center hole 1 on the front of cone-shaped diaphragm 11
A spherical center cap 17 is fixed in the middle of the center cap 3. The center cap 17 protrudes toward the front of the cone-shaped diaphragm 11, and has a continuous fine light scattering surface 17a formed on the surface. The light diffusing surface 17a refracts a part of the transmitted light and diffuses the light. Further, since the center cap 17 is spherical, it has a function of diffusing a light beam as a convex lens effect.

A frame 18 made of an alloy is provided so as to surround the cone-shaped diaphragm 11. The frame 18 has a front annular portion 18 along the edge 12 of the cone-shaped diaphragm 11.
a and the legs 18b (four in this embodiment) supporting the annular portion 18a and the rear annular portion 18 to which the rear ends of the legs 18b are joined.
c. A flange portion 12a extends around the edge 12 of the cone-shaped diaphragm 11. The flange portion 12a is placed on the fixing surface 19 of the annular portion 18a and is pressed down by the packing 20. Frame 18
Between the bobbin 14 and the bobbin 14, a damper 21 is provided.
The damper 21 is an annular film member surrounding the bobbin 14, and has an inner peripheral edge fixed to the outer periphery of the bobbin 14 and an outer peripheral edge fixed to the inner periphery of the rear annular portion 18 c of the frame 18. As a result, the cone-shaped diaphragm 11 is
2a and the damper 21 support the frame 18.

The frame 18 is fixed on a fixed surface 23a on the front surface of an iron base 23 via a rear annular portion 18c. A voice coil slide groove 25 having an annular cross section is formed from the fixed surface 23 toward the back of the base 23. The voice coil 15 of the bobbin 14 is inserted into the voice coil slide groove 25. A cylindrical LED fixing base 26 surrounded by the voice coil slide groove 25
Are formed. An annular permanent magnet 27 is fitted into the band groove portion 23b on the outer periphery of the base 23, and the voice coil slide groove 25 is surrounded by the permanent magnet 27.
Although the base 23 is of a split-assembly type, a description of how to assemble it in this embodiment is omitted.

A base 29 on which an LED circuit 28 is mounted is fixed to the upper surface of the LED fixing base 26. Figure 1
As shown in FIG. 3, the LED circuit 28 has three high-brightness LEDs 31 of red, green, and yellow on its surface. As shown in FIG. 3, one resistor 32 is connected to each LED 31 in series, and a combination of the LED 31 and the resistor 32 connected in series is connected in parallel. A diode 33 is connected in series to such a parallel circuit. The LED circuit 28 is connected in parallel to the voice coil 15 via a second lead wire 35.

Next, the operation of the speaker unit thus configured will be described. AC audio current is supplied from an amplifier device (not shown) via the first lead wire 16. Then, the voice coil 15 is caused to vibrate in a direction perpendicular to the magnetic flux of the permanent magnet 27, that is, in the front-rear direction by the electromagnetic induction action (the so-called left-hand rule) according to the magnitude and direction of the current. I do. This vibration is transmitted from the bobbin 14 to the cone-shaped diaphragm 11, and the cone-shaped diaphragm 11 is vibrated to generate a sound wave and sound. At this time, a part of the audio current is shunted to the LED circuit 28 via the second lead wire 35 (hereinafter, this shunt audio current is referred to as a shunt current 11). The shunt current 11 is rectified by the diode 33, and each LED 31 has a resistor 32 in FIG.
And an appropriate voltage V1 (approximately 1.5 to 3 V in the present embodiment) is applied. Then, the shunt current l
Each LED 3 has a luminous intensity according to the magnitude of the audio current according to 1.
1 emits light. That is, if the amplitude of the audio current is large, the sound pressure is high, and the shunt current 11 is correspondingly large, so that each LED 31 emits light with high luminous intensity. Conversely, if the amplitude of the audio current is small, the sound pressure will be low, and accordingly, each L
The ED 31 also emits light at low luminous intensity or does not emit light when the current is extremely small. The distance of the light of the LED 31 until it reaches the center cap 17 (about 5 cm in the present embodiment)
Therefore, the luminous flux is diffused, and further diffused by the convex lens effect due to the spherical shape with the light scattering surface 17a.

With this configuration, the first embodiment has the following advantages. (1) Not only reproduction sound of music and the like from the speaker unit, but also visual stimulus by light synchronized with the rhythm of music can be obtained, and a speaker unit that has never existed can be provided. (2) A separate power source is not required, only the shunt current is supplied to the LED circuit 28. Therefore, the structure is simple and the cost can be reduced. (3) The luminous intensity changes depending on the magnitude of the amplitude of the audio current.
In other words, if the sound pressure is high, the luminosity of each LED 31 is correspondingly high, and the loud sound shines well, and the expression of light changes according to the sound. Will be increased. (4) The light from each LED 31 is scattered by the light diffusing surface 17a of the center cap 17, and the luminous flux is largely diffused by the center cap 17 because the spherical center cap 17 is arranged at a considerable distance from each LED 31 of the light source. Let me do. Therefore, the viewer sees light that spreads significantly on the surface of the center cap 17 having a considerable area inside the cone-shaped diaphragm 11. Therefore,
Light itself can actively give the viewer considerable stimulus, not just as an ancillary effect such as music. (5) The LED circuit 28 is installed on the fixed base 25 on the base 23. Therefore, even if the cone-shaped diaphragm 11, the bobbin 14, and the like vibrate due to the generation of sound pressure, the speaker unit is not affected by the vibration and can be supplied with less trouble. (6) Since the LED 31 emits light with very small power, even if the LED circuit 28 is provided, it has almost no effect on the audio power, and the speaker unit without the LED circuit 28 can enjoy music and the like with the same sound quality. it can.

(Second Embodiment) A second embodiment will be described with reference to FIG. Since the second embodiment is almost common to the first embodiment, the same components are denoted by the same reference numerals in the drawings, and description thereof will be omitted. As shown in FIG. 4, an LED light emitting coil 38 is wound around the outer periphery of the bobbin 14 and in front of the voice coil 15. The LED light emitting coil 38 is inserted into the voice coil slide groove 25 together with the voice coil 15. As shown in FIG. 5, the LED circuit 28 is connected to the LE via a second lead wire 39.
It is connected to the D light emitting coil 38.

Next, the operation of the thus configured speaker unit will be described. AC audio current is supplied from an amplifier device (not shown) via the first lead wire 16. Then, the voice coil 15 is caused to vibrate in a direction perpendicular to the magnetic flux of the permanent magnet 27, that is, in the front-rear direction by the electromagnetic induction action (the so-called left-hand rule) according to the magnitude and direction of the current. I do. This vibration is transmitted from the bobbin 14 to the cone-shaped diaphragm 11, and the cone-shaped diaphragm 11 is vibrated to generate a sound wave and sound. Bobbin 1
When the 4 vibrates, the LED light emitting coil 38 turns the permanent magnet 27
To cut off the magnetic flux. Then LED lighting coil 3
8 generates an electromotive force (current) by an electromagnetic induction action (the so-called right-hand rule). This current is applied to the second lead wire 39
(Hereinafter, a current based on the electromotive force is referred to as a generated current 12). Generated current l2
Is rectified by a diode 33, and in FIG. 5, an appropriate voltage V2 (approximately 1.5 to 3 V in the present embodiment) is applied to each LED 31 by being stepped down by a resistor 32. Then, each LED 31 emits light at a luminous intensity according to the magnitude of the audio current by the generated current 12. In other words, if the sound pressure is high and the swing of the bobbin 14 is large, the generated current 12 is correspondingly large, so that each LED 31 also emits light with high luminous intensity. Conversely, if the sound pressure is low and the swing of the bobbin 14 is small, each LED 31 emits light at a low luminous intensity or does not emit light when the current is extremely small.

With this configuration, the second embodiment has the following advantages. (1) The LED circuit 28 is merely supplied with a current based on the electromotive force generated by the LED light emitting coil 38, and does not require another power supply. Therefore, the structure is simple and the cost can be reduced. (2) The luminous intensity changes depending on the magnitude of the swing of the bobbin 14. In other words, if the sound pressure is large, each LED 31
Since the luminous intensity of the light increases, loud sounds shine well, and the expression of the light changes according to the sound. Therefore, for those who listen to music and the like, the light of each LED 31 further increases the interest of the music. Note that the effects (1), (4), (5), and
(6) is similarly achieved in the second embodiment.

Incidentally, the present invention can be embodied with the following modifications. In the first and second embodiments, the center cap 17 is formed with the light diffusing surface 17a. Also center cap 1
Reference numeral 7 has a convex lens effect, and a distance is provided from the position of the LED 31 to the position of the center cap 17 in order to effectively utilize the convex lens effect. However, the center cap 17 having such functions as long as it has translucency is not required. The translucency may be such that even part of the light of the LED 31 is visible, and for example, a cloudy glass or a center cap having a through hole may be used. In the above embodiment, the distance from the top of the LED 31 to the top of the back of the center cap 17 was set to about 5 cm. However, this setting can be changed, and the distance is preferably equal to or longer than the length of the LED 31. In the first and second embodiments, the substrate 29 on which the LED circuit 28 is mounted is mounted on the columnar LED fixing base 26. However, as long as the LED 31 on the base 29 is a part of the base 23 and can be seen through the center hole 13, any installation method may be used. In the first and second embodiments, the LED circuit 28 is the base 29
Although it was configured to be mounted on the
8 may be installed on the base 23. In that case, LED
In the circuit 28, since only the LED 31 needs to be visible through the center hole 13, the other circuit components are LE
You may make it arrange | position at a different position from D31. In the first and second embodiments, the voice coil 15 and the LED are used.
The light-emitting coil 38 is wound around the bobbin 14, but these coils may be solidified with resin to also serve as the bobbin. In addition, it is possible to freely change and implement in a manner that does not deviate from the gist of the present invention, such as a common sense design change of the speaker unit and a change in the number of the LEDs 31.

Other technical ideas of the present invention that can be grasped from the above embodiment will be described below. (1) The cone type speaker unit according to claim 1 or 2, wherein a light transmitting center cap for closing a center hole is attached to the cone type diaphragm. With this configuration, in addition to the effect of the first or second aspect of the present invention, the LED can be viewed through the center cap even when the center hole is closed. (2) The cone type speaker unit according to supplementary note 1, wherein the center cap has a light scattering property. With this configuration, light emitted from the LED is diffused. Therefore, the visual effect is higher than in the case of directly viewing light. (3) The cone-shaped speaker unit according to Supplementary Note 1 or 2, wherein the center cap is disposed at a position separated from the LED in order to diffuse a light beam from the LED position. With such a configuration, the light flux emitted from the LED is diffused and reaches the center cap, so that a center cap as an illuminated surface with more diffused light can be obtained.

[0020]

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a cone type speaker unit according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of the same cone type speaker unit.

FIG. 3 is an equivalent circuit diagram of an LED circuit of the same cone type speaker unit.

FIG. 4 is a sectional view of a cone type speaker unit according to a second embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram of an LED circuit of the same cone type speaker unit.

[Explanation of symbols]

11: cone type diaphragm, 12: edge, 13: center hole, 15: voice coil, 18: frame, 21 ...
Damper, 23: Base, 27: Permanent magnet, 28: LE
D circuit, 31 LED, 38 LE as power generation coil
D Light emitting coil.

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[Procedure amendment]

[Submission date] September 28, 1999 (1999.9.2)
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

Means for Solving the Problems To solve the above problems, according to the invention of claim 1, a cone-shaped diaphragm, a frame supporting the cone-shaped diaphragm via an edge, and a cone-shaped diaphragm A voice coil attached to the periphery of the center hole of the base, a damper for supporting the voice coil with respect to the frame so as to be able to advance and retreat, a magnet surrounding the voice coil, and a base to which the magnet and the frame are fixed. A cone type speaker unit having an LED circuit connected in parallel to the voice coil;
The LED of the ED circuit is installed in an area on the base and surrounded by the voice coil so as to be visible through the center hole of the cone-shaped diaphragm.
In addition, the cone-shaped diaphragm has a transparent
The gist is that a center cap having light and light scattering properties is attached .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

With this configuration, when a voice current flows through the voice coil, an electromagnetic induction action (a so-called left-hand rule) occurs.
As a result, the voice coil moves in a direction orthogonal to the magnetic flux. This movement causes the cone-shaped diaphragm to vibrate, generating sound waves and sounding. At this time, part of the audio current is diverted to the LED circuit to cause the LED to emit light. When the sound current increases, the vibration amount (amplitude) of the cone-shaped diaphragm also increases, and a loud sound is generated. However, when the sound current increases, the shunt current also increases, so that the light emission amount also increases. Since the LED circuit is installed on the base, it does not vibrate even if the cone-shaped diaphragm vibrates. LED
Since the circuit is installed on the base surrounded by the voice coil, the LED is passed through the center cap from the front of the speaker unit, that is, the direction directly opposite the center hole.
Can be visually observed. At that time, on the center cap
Since the LED light is scattered, the viewer is
You can see the light spreading on the surface of the lamp.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

According to the second aspect of the present invention, a cone-shaped diaphragm and a frame supporting the cone-shaped diaphragm via an edge are provided.
A voice coil attached to the periphery of the center hole of the cone-shaped diaphragm base, a damper for supporting the voice coil with respect to the frame so as to be able to advance and retreat, a magnet surrounding the voice coil, the magnet and the frame A cone-type speaker unit having a fixed base,
A power generating coil that vibrates in synchronization with the vibration of the cone-shaped diaphragm is arranged in a magnetic field surrounded by the magnet, an LED circuit is connected to the power-generating coil, and an LED of the LED circuit is connected to the cone-shaped diaphragm. It is installed in an area surrounded by the voice coil on the base so as to be visible through the center hole , and the cone-shaped diaphragm is
Has a light-transmitting and light-transmitting property to block the center hole
The gist is that a center cap is attached .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

With this configuration, when a voice current flows through the voice coil, an electromagnetic induction action (a so-called left-hand rule) occurs.
As a result, the voice coil moves in a direction orthogonal to the magnetic flux. This movement causes the cone-shaped diaphragm to vibrate, generating sound waves and sounding. At this time, the vibration of the cone-shaped diaphragm reverses the magnetic flux of the power generation coil in the magnetic field of the magnet, so that an electromotive force (current) is generated by the electromagnetic induction action (the so-called right-hand rule) and flows to the LED circuit to emit the LED. Let it. As the sound current increases, the vibration amount (amplitude) of the cone-shaped diaphragm also increases, and accordingly, the magnetic flux cut by the power generation coil per unit time also increases. Therefore, the light emission amount also increases. Since the LED circuit is installed on the base, it does not vibrate even if the cone-shaped diaphragm vibrates. LED
Since the circuit is installed on the base surrounded by the voice coil, the LED is passed through the center cap from the front of the speaker unit, that is, the direction directly opposite the center hole.
Can be visually observed. At that time, on the center cap
Since the LED light is scattered, the viewer is
You can see the light spreading on the surface of the lamp.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

According to the first and second aspects of the present invention, the LED of the LED circuit provided adjacent to the speaker unit emits light while changing the luminous intensity in response to the change in the audio current, and the light is emitted.
For spreading on the surface of the coater cap, can be a person listening to music emanating from the speaker unit can also be enjoyed dispersed light is not suited to the music by music, obtaining stimuli from both auditory and visual Becomes Furthermore, since the LED is not on the cone-shaped diaphragm but on the base, it is less susceptible to aging due to the vibration of the cone-shaped diaphragm.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

Other technical ideas of the present invention that can be grasped from the above embodiment will be described below. (1) Before Symbol center cap cone type speaker unit according to Note 1 or 2, characterized in that it is disposed at a position spaced from the LED to diffuse light beam from the LED position. With such a configuration, the light flux emitted from the LED is diffused and reaches the center cap, so that a center cap as an illuminated surface with more diffused light can be obtained.

Claims (2)

[Claims] 1. A cone-shaped diaphragm, a frame supporting the cone-shaped diaphragm through an edge, a voice coil attached to a periphery of a center hole of a base of the cone-shaped diaphragm,
A damper that supports the voice coil with respect to the frame so as to be able to move forward and backward, a magnet surrounding the voice coil, and a cone-type speaker unit having a base to which the magnet and the frame are fixed, wherein the voice coil has Light Emitting Diode in parallel
e (hereinafter referred to as LED) circuit, and the LED of the LED circuit is installed in the area surrounded by the voice coil on the base so that the LED can be seen through the center hole of the cone-shaped diaphragm. A cone type speaker unit characterized in that: 2. A cone-shaped diaphragm, a frame supporting the cone-shaped diaphragm via an edge, a voice coil attached to a periphery of a center hole of a base of the cone-shaped diaphragm,
A cone-type speaker unit comprising: a damper that supports the voice coil so that the voice coil can move forward and backward with respect to the frame; a magnet that surrounds the voice coil; and a base to which the magnet and the frame are fixed. A power generating coil that vibrates in synchronization with the vibration of the plate is arranged in a magnetic field surrounding the magnet, an LED circuit is connected to the power generating coil, and an LED of the LED circuit is passed through the center hole of the cone-shaped diaphragm. A speaker unit which is installed on the base and in a region surrounded by the voice coil so as to be visible.