JP2003153378A - Speaker apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric energy generation source other than a battery without shielding rear and side visibility. SOLUTION: A reflector 19 is arranged at the front side of a speaker unit 14 having a diaphragm 4, a voice coil 6 coupled to the diaphragm, and a magnetic circuit 9 for providing a static magnetic field to the voice coil. A solar battery 27 is provided at the reflector.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel speaker device. More specifically, the present invention relates to a technique for providing a speaker device suitable for mounting on a vehicle, in which a reflector is provided as an acoustic reflection means and a solar cell is provided as an electric energy generating means in the reflector.

[0002]

2. Description of the Related Art In today's automobiles, various devices using electric energy as a drive source are used. For example, as a heater, an air conditioner, an audio device, a car navigator, and the like, electric fans and dehumidifiers for indoor ventilation during parking have been proposed.

On the other hand, in a voice coil type speaker device which is an output device of an audio device, heat generation of the voice coil becomes a problem, and an electric fan is used to suppress heat generation of the voice coil. Proposed.

[0004]

By the way, there is a battery as a source of electric energy in an automobile, but the battery is originally for ignition of an engine plug. Using a battery as an energy source for the electric and electronic devices mentioned above reduces the capacity for driving the engine starter and igniting the plug, so use for a long time or while the vehicle is stopped. Must be avoided.

Therefore, it is possible to use a solar cell as a source of electric energy for devices having a relatively small output among the above-mentioned devices, but in order to obtain a certain output, the solar cell is used over a considerable area. It is necessary to install a battery. Further, since the solar cell converts solar energy into electric energy and outputs it, the plate (solar panel) on which the solar cell is arranged needs to be arranged at a position where it is directly exposed to the sun. For example, it is conceivable to dispose a solar panel inside the rear windshield, but the solar panel obstructs the rear view, which is not preferable in terms of traffic safety. Moreover, the solar panel is completely visible from the outside and is unattractive.

[0006] Therefore, it is an object of the present invention to obtain an electric energy generating source other than a battery in order to obstruct the rear view and the side view and impair the appearance.

[0007]

The speaker device of the present invention comprises:
In order to solve the above-mentioned problems, a reflector is arranged on a front side portion of a speaker unit including a diaphragm, a voice coil coupled to the diaphragm, and a magnetic circuit unit that provides a static magnetic field to the voice coil. The reflector is equipped with solar cells.

Therefore, in the speaker device of the present invention,
Since the reflector required as the speaker device also has a function as a solar cell arranging surface, it is not necessary to provide a special solar cell arranging surface. If the speaker device is placed on a general rear tray as a place for placing the speaker device, the solar cell mounting surface of the reflector will face the rear windshield, and the solar cell will be directly exposed to the sun. It is suitable as a battery installation position. Further, since the solar cell is attached to the reflector which is a component of the speaker device, even if it is seen from the outside, it does not spoil the appearance.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a speaker device of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show the first speaker device of the present invention.
An embodiment of is shown.

The speaker device 1 comprises a frame 2, and the frame 2 is provided with required members and parts. The frame 2 is formed in a substantially conical shape with a front end having an enlarged diameter, and a flange portion 3 protruding outward is formed at the front end. In addition,
When front and rear are referred to in this specification, the direction in which sound is emitted by the diaphragm 4 is the front and the opposite side is the rear.

An outer peripheral portion (front end portion) of a diaphragm 4 having a substantially conical shape whose front end has an enlarged diameter is supported on the front surface of the flange portion 3 of the frame 2 via an edge 5. A voice coil 6 is wound around an inner peripheral portion (rear end portion) of a diaphragm (woofer cone paper) 4 that emits a sound in a low range, and a front end portion of a coil bobbin 7 having a substantially cylindrical shape is coupled to the coil bobbin 7. It is supported by the frame 2 via a damper 8.

A magnetic circuit section 9 is provided at the rear end of the frame 2.
Is supported. The magnetic circuit unit 9 includes a bottom plate 10 and a top plate 11 made of a magnetic material, and a magnet 12. The bottom plate 10 is formed by integrally projecting a center pole 10b from the center of a substantially disk-shaped rear surface portion 10a toward the front.
1 is formed in an annular shape. The magnet 12 is formed in an annular shape, and the bottom plate 10 has a rear surface portion 10a.
And the top plate 11 are supported in a sandwiched manner. A small gap (gap) 1 is formed between the outer peripheral surface of the center pole 10b and the inner peripheral surface of the top plate 11.
3 is formed.

The magnetic circuit portion 9 is the top plate 1
Frame 1 so that 1 is in contact with the rear end of frame 2
The boil coil 6 which is fixed to the coil bobbin 7 and is wound around the coil bobbin 7 is positioned in the gap 13 of the magnetic circuit section 9.

As described above, the woofer speaker unit 14 for outputting the sound in the low range is formed.

A connecting member 15 made of a non-magnetic material is projected from the center of the bottom plate 10 toward the front, and a common frame 16 is fixed to the front end of the connecting member 15. The common frame 16 supports a squawker speaker unit 17 for outputting a sound in the middle frequency range and a tweeter speaker unit 18 for outputting a sound in the high frequency range. It should be noted that detailed illustration and description of the structures of the squawker speaker unit 17 and the tweeter speaker unit 18 are omitted.

At the outer edge of the front end of the frame 2, a reflector 19 is rotatably supported as an acoustic reflection means. The reflector 19 is supported with respect to the frame 2 so that its angle can be adjusted, that is, it can be rotated with respect to the frame 2 and can be stopped at an arbitrary angle.

The specific supporting method of the reflector 19 is not particularly limited, but for example, the supporting by a friction leaf spring can be applied. As a structure using a friction leaf spring, as shown in FIGS. 3 and 4, a chamfered flat surface 20a is formed along the axial direction, and the other end of the rotary shaft 20 has a flange 20b at one end. The reflector 19
It is possible to consider a structure in which the rotary shaft 20 is supported by a friction leaf spring 21 fixed to the frame 2. The friction leaf spring 21 is made of a leaf spring material, and is provided with a supported portion 21a fixed to the frame 2 and the supported portion 21a.
And a winding portion 21b having a tip portion wound in a circular shape and projecting from one side edge of the winding portion 21b.
Is an angle of 300 degrees or more, preferably 3 to the rotary shaft 20.
The winding part 21b is wound at an angle of about 30 degrees.
The flange 20b of the rotary shaft 20 is engaged with one end of the rotary shaft 20 to prevent the rotary shaft 20 from coming off the winding portion 21b.

The reflector 19 is used as a sound reflection means. That is, when the speaker device 1 is attached to the interior of an automobile, the rear tray 22 is generally used as its attachment position. The rear tray 22 as shown in FIG.
When the speaker device 1 is attached to, the sound output direction is the ceiling surface direction of the automobile. Woofer speaker unit 1
Since the low-range sound output by 4 has low directivity, there is not much problem, but the mid-range and high-range sounds output by the squawker speaker unit 17 and the tweeter speaker unit 18 have high directivity, and these sounds are If it is output toward the ceiling surface, it will be significantly attenuated by the time it reaches the listener 23. Therefore, by reflecting the sounds in the midrange and high range to the listener 23 by the reflector 19, it is possible to hear a well-balanced sound without attenuation of the midrange and high range sounds.

In the woofer speaker unit 14 described above, when an acoustic signal is input to the voice coil 6, a force according to Fleming's left hand rule is applied to the voice coil 6 arranged in the gap 13 in the static magnetic field.
The voice coil 6 vibrates back and forth, and as a result, the diaphragm 4 coupled to the voice coil 6 vibrates back and forth to generate a voice.

In a voice coil type speaker unit such as the woofer speaker unit 14, only a few percent of the acoustic signal (current) is converted into voice and the rest is converted into heat, and the voice coil is heated by the heat. The temperature of 6 rises. The increase in temperature of the voice coil 6 is considered as one of the major causes of damage to the speaker unit. Moreover, since the temperature rise of the voice coil 6 is based on the above-mentioned reason, the speaker unit having a larger output like the woofer speaker unit 14 has a larger voice coil 6.
The temperature rises in. As a result, the voice coil 6 may be destroyed by heat.

Therefore, in the above speaker device 1,
A heat sink 24 formed of a material having good heat conductivity is attached to the rear surface of the rear surface portion 10a of the bottom plate 10 of the magnetic circuit portion 9, and the heat generated in the voice coil 6 is transferred from the center pole 10b of the bottom plate 10 to the rear surface portion 10a. → path of heat sink 24 and top plate 11 →
Magnet 12 → rear surface 10a of bottom plate 10 →
Heat is dissipated through the heat sink 24 through a path called the heat sink 24, thereby suppressing the temperature rise of the voice coil 6.

However, since sufficient heat dissipation cannot be expected only by the heat dissipation by the heat sink 24, the electric fan 25 is attached to the rear side of the heat sink 24, and the electric fan 25 blows air on the heat sink 24 for forced air cooling. Is done.

In the electric fan 25, a motor 25b is arranged in a housing 25a, and a fan 25d is fixed to a rotary shaft 25c of the motor 25b. The blower blade 25d is rotated by the drive of the motor 25b, and the blower blade 2
The wind is applied to the heat sink 24 by the rotation of 5d. Ventilation holes 26 communicating with the gap 13 are formed in the rear surface portion 10a of the heat sink 24 and the bottom plate 10 so that the wind from the electric fan 25 is guided to the gap 13 to directly cool the boil coil 6 by air. It is also becoming.

In the above speaker device 1, the voice coil 6 of the woofer speaker unit 14 which generates a large amount of heat.
Is forcibly air-cooled by the electric fan 25, it is possible to prevent the output drop and the damage due to the high temperature of the voice coil 6 of the woofer speaker unit 14.

By using the battery as the drive source of the electric fan 25, the capacity for driving the starter of the engine and igniting the plug is reduced as described above. It is not preferable for the original use of the battery installed in the automobile.

Therefore, in the above speaker device 1,
A surface 19a of the reflector 19 facing the squawker speaker unit 17 and the tweeter speaker unit 18, that is, a surface 19b opposite to the acoustic reflection surface.
The solar cell 27 is arranged in the. The solar cell 27 converts solar energy into electric energy and outputs the electric energy, and uses the electric energy as a drive source of the motor 25 b of the electric fan 25. As a result, the temperature rise of the voice coil 6 of the speaker unit 14 can be suppressed without fear of reducing the battery capacity for driving the electric fan 25.

As shown in FIG. 5, when the speaker device 1 is attached to the rear tray 22 of an automobile for use, the solar cell arrangement surface 19b of the reflector 19 faces the rear windshield 28, and the surface 19b is provided.
The solar cell 27 arranged in the above can be directly radiated to the sun through the rear windshield 28 and efficiently generate electric energy. Also, the reflector 19
Can be stopped and used at any angle,
You can also adjust the output by adjusting the angle to the sun.

The use of the heat sink 24 is not always necessary, but the use of the heat sink 24 improves the cooling efficiency of the voice coil 6. When using a heat sink, as shown in the modification of FIG. 6, if a heat sink 29 having a large number of fins 29a, 29a, ... Is used, the cooling efficiency can be further improved.

FIG. 7 shows a speaker device according to a second embodiment of the present invention.

The speaker device 1 according to the above-described first embodiment is one in which the present invention is applied to a so-called three-way type speaker device, and the reflector 19 is supported on the frame 2 of the woofer speaker unit 14. On the other hand, in the speaker device according to the second embodiment, the present invention is applied to a so-called full-range type speaker device, and the reflector is arranged close to the speaker unit.

The speaker device 30 according to the second embodiment includes a reflector 3 rotatably supported by a full-range type speaker unit 31 and a mounting grill 33.
It consists of 2.

The speaker unit 31 is provided with a frame 34, and the frame 34 is provided with required members and parts. The frame 34 is formed in a substantially conical shape with a front end having an enlarged diameter, and a flange portion 35 protruding outward is formed at the front end.

The outer peripheral portion (front end portion) of the diaphragm 36, which is formed in a substantially conical shape with its front end expanded, is supported by the front surface of the flange portion 35 of the frame 34 via the edge 37. A gasket 38 formed of an elastic material such as urethane foam is attached to a position outside the edge 37 on the front surface of the flange portion 35. A voice coil 39 is wound around an inner peripheral portion (rear end portion) of the diaphragm 36, and a front end portion of a coil bobbin 40 having a substantially cylindrical shape is coupled to the diaphragm 36. The coil bobbin 40 is supported by the frame 34 via a damper 41. There is.

A magnetic circuit section 42 is supported at the rear end of the frame 34. The magnetic circuit section 42 includes a bottom plate 43 and a top plate 44 made of a magnetic material, and a magnet 45. The bottom plate 43 has a substantially disk-shaped rear surface portion 43a from the center portion to the center pole 43.
The top plate 44 is formed in an annular shape by integrally projecting b toward the front. The magnet 45 is formed in an annular shape, and is supported between the rear surface portion 43 a of the bottom plate 43 and the top plate 44 in a sandwiched manner. Then, a gap 46 is formed between the outer peripheral surface of the center pole 43b and the inner peripheral surface of the top plate 44. In addition, a plurality of ventilation holes 47, 47, ...
Are formed.

The magnetic circuit portion 42 is fixed to the frame 34 so that the top plate 44 contacts the rear end portion of the frame 34, and the voice coil 39 wound around the coil bobbin 40 has the gap 46 of the magnetic circuit portion 42. Is located in.

The bottom plate 43 of the magnetic circuit section 42.
An electric fan 48 is fixed to the rear surface of the rear surface portion 43a. The electric fan 48 includes a motor 48b in a housing 48a.
Is arranged, and the blower blade 48d is fixed to the rotary shaft 48c of the motor 48b. The blower blade 48d is rotated by driving the motor 48b, and the wind is blown to the rear surface portion 43a of the bottom plate 43 by the rotation of the blower blade 48d. Further, the wind from the electric fan 48 is guided to the gap 46 through the ventilation holes 47, 47, ... Formed in the rear surface portion 43a of the bottom plate 43 to directly air-cool the boil coil 39.

When the speaker unit 31 is attached to the rear tray 49 of an automobile, the attachment grill 33 is attached so as to cover the attachment hole 49a formed in the rear tray 49 from the outside, and the opening 33a formed in the attachment grill 33 is made of a thin metal plate. It is covered with a metal grill 50 having a large number of small holes. The gasket 3 is attached to the inner opening edge of the opening 33a so as to cover the opening 33a of the mounting grill 33 from the inside.
The speaker unit 31 is positioned in a state in which 8 is abutted, and in that state, the speaker unit 31 is fixed by appropriate means.

A stay 51 is erected in the vicinity of the outer opening edge of the opening 33a of the mounting grill 33, and the stay 32 is rotatably supported by the stay 51 and can be stopped at an arbitrary angle. Then, when the reflector 32 is closed, that is, when the acoustic reflection surface 32a of the reflector 32 faces the front surface of the speaker unit 31, as shown by the solid line in FIG. Is completely covered, and dust and the like are prevented from entering the speaker unit 31. That is,
When the speaker unit 31 is not used, the speaker unit 31 can be covered with the reflector 32. Then, the solar cell 52 is disposed on the surface 32b of the reflector 32 opposite to the acoustic reflection surface 32a, and the solar cell 52 is connected to the motor 48 of the electric fan 48.
The source of electric energy to b.

Since the speaker devices 1 and 30 described above are provided with the reflectors 19 and 32 as the sound reflection means, the reflectors 19 and 32 reflect the sound to listen to the desired balanced sound. Can be done. Moreover, the solar cells 2 are attached to the reflectors 19 and 32.
7, 52 are provided, the solar cells 27, 52
The electric energy output by the can be used as a drive source for in-vehicle electric devices and electronic devices, and the load on the battery can be reduced. The solar cells 27 and 52 are provided as electric energy sources, and the reflectors 19 and 32, which are necessary parts for the speaker devices 1 and 30, are applied as the installation locations thereof.
It does not spoil the appearance of the car with the 7,52 installed.

Further, in the above speaker devices 1 and 30, since the electric fans 25 and 48 are provided as the cooling means for the voice coils 6 and 39, the speaker units 14 and 31 are provided.
It is possible to suppress the heating of the voice coils 6 and 39 of the electric fan 25 and the electric fan 25 and
As the electric energy source of 8, electric fans 25, 3
There is no need to drain the battery to drive the 9. In the above embodiment, the electric fans 25 and 48 are given as the cooling means using the solar cells 27 and 52 as the energy source. Other types of cooling means, such as one using a refrigerant and one using a thermocouple, may be used.

Further, in the above speaker devices 1 and 30, the reflectors 19 and 32 are the speaker unit 1
Since it is rotatable with respect to 4, 31, the solar cell 27,
The angle of 52 with respect to the sun can be optimally selected.

Furthermore, in the speaker device 30, the reflector 32 also serves as a lid that closes the front surface of the speaker unit 31 at one end of the rotation range, and the inside of the speaker unit 31 is used when the speaker unit 31 is not used. It is possible to prevent dust and the like from entering the inside.

It should be noted that the shapes and structures of the respective portions shown in the above-mentioned respective embodiments are merely examples of the embodiment to be carried out when carrying out the present invention,
The technical scope of the present invention should not be limitedly interpreted by these.

[0045]

As is apparent from the above description, the speaker device of the present invention includes the diaphragm, the voice coil coupled to the diaphragm, and the magnetic circuit section for providing a static magnetic field to the voice coil. A reflector is arranged on the front side of the speaker unit, and a solar cell is provided on the reflector.

Therefore, in the speaker device of the present invention,
Since the reflector required as the speaker device also has a function as a solar cell arranging surface, it is not necessary to provide a special solar cell arranging surface. If the speaker device is placed on a general rear tray as a place for placing the speaker device, the solar cell mounting surface of the reflector will face the rear windshield, and the solar cell will be directly exposed to the sun. It is suitable as a battery installation position. Further, since the solar cell is attached to the reflector which is a component of the speaker device, even if it is seen from the outside, it does not spoil the appearance.

In the invention described in claim 2, since the cooling means using the electric energy of the solar cell as a drive source is provided and the voice coil is cooled by the cooling means, the voice coil is heated. In addition, the solar cell is used as an electric energy source for driving the cooling means, so that it is not necessary to drain the battery for driving the cooling means.

In the invention described in claim 3, since the reflector is rotatable with respect to the speaker unit, the angle of the solar cell with respect to the sun is optimally selected,
A desired electric energy output can be obtained.

According to the invention described in claim 4, since the reflector can be stopped at an arbitrary angle with respect to the speaker unit, the angle of the selected reflector can be kept stable.

In the invention described in claim 5, since the reflector closes the front surface of the speaker unit at one end of the rotation range, dust and the like are prevented from entering the speaker unit when the speaker unit is not used. You can do it.

[Brief description of drawings]

FIG. 1 shows a first speaker device of the present invention together with FIGS. 2 to 6.
This is a vertical cross-sectional view.

FIG. 2 is a front view.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic view showing a usage state.

FIG. 6 is a vertical sectional view showing a modified example.

FIG. 7 is a vertical cross-sectional view showing a second embodiment.

[Explanation of symbols]

1 ... Speaker device, 4 ... Diaphragm, 6 ... Voice coil, 9
... magnetic circuit part, 14 ... woofer speaker unit (speaker unit), 19 ... reflector, 25 ... electric fan (cooling means), 27 ... solar cell, 30 ... speaker device, 31 ... speaker unit, 32 ... reflector, 3
6 ... Vibration plate, 39 ... Voice coil, 42 ... Magnetic circuit part,
48 ... Electric fan (cooling means), 52 ... Solar cell

Claims (5)

[Claims] 1. A reflector is disposed on a front side of a speaker unit having a diaphragm, a voice coil coupled to the diaphragm, and a magnetic circuit section for providing a static magnetic field to the voice coil, and the solar cell is provided in the reflector. A speaker device characterized by being provided. 2. The speaker device according to claim 1, further comprising a cooling unit that uses electric energy of the solar cell as a drive source, and the cooling unit cools the voice coil. 3. The speaker device according to claim 1, wherein the reflector is rotatable with respect to the speaker unit. 4. The speaker device according to claim 3, wherein the reflector can be stopped at an arbitrary angle with respect to the speaker unit. 5. The speaker device according to claim 3, wherein the reflector closes a front surface of the speaker unit at one end of a rotation range.