JP2003116196A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker that can be used for a large variety of uses by making a portion of a structure variable and also making components to be easily replaceable. SOLUTION: In this speaker with a conductive circuit incorporated on a diaphragm, wherein a magnetic flux is generated in the conductive circuit with an electric signal inputted to the conductive circuit, and attraction and repulsion are generated in a magnetic circuit disposed adjacently to the diaphragm with the magnetic flux to make the diaphragm vibrate, a frequency sound pressure characteristic is made to be changeable by making the distance between the diaphragm and the magnetic circuit changeable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker of an electroacoustic transducer used in computers, audio systems, video systems and the like.

[0002]

2. Description of the Related Art Conventionally, as such a speaker, there is a speaker using a diaphragm incorporating a conductive circuit.
FIG. 7 is a diagram showing an example of the conventional speaker. Here, a 4-cell conductive circuit built-in diaphragm is used. The figure (a) is a plan view, the figure (b) is an AA 'sectional view, the figure (c) is an internal plan view, and the figure (d) is a bottom view. FIG. 3C shows a state where the diaphragm and the edges described later are removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

The magnet 1 is fixed to the bottom surface of a dish-shaped frame 2 made of, for example, a steel plate to form a magnetic circuit. Further, a vibration plate 3 is provided above the magnets 1, and a square coil-shaped conductive circuit 5 is arranged on the vibration plate 3 at a position facing each magnet 1, which is also arranged in a square shape. It is set up. The vibrating plate 3 is fixed to the peripheral portion of the frame 2 via the elastic edge 4, and keeps a constant distance from the magnetic circuit.
Further, a terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the frame 2. In addition, h is a sound emission hole opened in plural in each frame.

When an electric signal is applied to the terminal 6, it is guided to the conductive circuit 5, and a current flows through the conductor in the conductive circuit 5. As a result, a magnetic flux is generated in the conductive circuit 5, and a magnetic circuit close to the magnetic flux is attracted or repulsed to vibrate the diaphragm 3. This has a so-called gamuzon type configuration. The frequency sound pressure characteristic of the speaker of this example is shown in FIG. Here, the horizontal axis represents the audio frequency (H
z), and the vertical axis represents the sound pressure level (dB).

FIG. 8 is a diagram showing another example of a conventional speaker. Here again, a 4-cell conductive circuit built-in diaphragm is used. The figure (a) is a plan view, the figure (b) is an AA 'sectional view, the figures (c) and (d) are internal plan views, and the figure (e) is a bottom view. FIG. 3C shows a state in which an upper frame described later is removed. The same figure (d)
Shows the state when the diaphragm and edges, which will be described later, are removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

Here, one of the combinations of the magnets 1 is fixed to the bottom surface of the dish-shaped frame 2 made of, for example, a steel plate to form a first magnetic circuit. Further, a vibration plate 3 is provided on the upper side of the magnet 1, and a square coil-shaped conductive circuit 5 is provided on the vibration plate 3 at a position facing each magnet 1, which is also in a square shape. It is arranged. The vibrating plate 3 is fixed to the peripheral portion of the frame 2 via the elastic edge 4, and keeps a constant distance from the magnetic circuit.

The other of the combinations of the magnets 1 is fixed to a ceiling surface of a lid-shaped frame 21 made of, for example, a steel plate to form a second magnetic circuit. The frame 21 is arranged on the upper side of the diaphragm 3, and is fitted and fixed to the frame 2 at their peripheral portions. At this time, the polarities of the magnets 1 used in each magnetic circuit are set to be plane-symmetric with respect to the diaphragm 3. With the above configuration, the magnetic performance is improved as compared with the case of the above conventional example. Further, a terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the frame 2. In addition,
Reference numeral h is a sound output hole formed in each frame. The operation is similar to that shown in the above conventional example. The frequency sound pressure characteristic of the speaker of this example is shown in FIG.

[0008]

However, in the above-mentioned conventional structure, it is necessary to change the structure and to assemble in order to change the reproduction band or attach different parts depending on the use of the speaker unit. there were. Therefore, many types of speaker units have to be manufactured, which is disadvantageous in terms of productivity and cost.

Further, as disclosed in Japanese Patent Application Laid-Open No. 11-75296, there is disclosed an electromagnetic receiver capable of adjusting the sound pressure sensitivity characteristic, which stabilizes the variation of the characteristic due to the variation of the assembly accuracy. It's just something to turn into. The structure uses a magnetic material for the diaphragm, and the operating principle is an electromagnetic type that vibrates depending on the strength of the attraction force to the magnetic material, which is significantly different from the structure of the speaker intended by the present invention.

In view of the above problems, the present invention provides a speaker which can be used for various purposes by changing a part of the structure and by making it possible to easily replace parts. The purpose is to

[0011]

In order to achieve the above object, according to the present invention, there is provided a speaker in which a conductive circuit is incorporated on a diaphragm, wherein a magnetic flux is applied to the conductive circuit by an electric signal input to the conductive circuit. Occurs, and the distance between the diaphragm and the magnetic circuit can be changed in the speaker in which the diaphragm vibrates due to attraction and repulsion by the magnetic flux with respect to the magnetic circuit arranged close to the diaphragm. It is characterized in that the frequency sound pressure characteristic can be changed.

Further, in the speaker in which a conductive circuit is incorporated on the diaphragm, magnetic flux is generated in the conductive circuit due to an electric signal inputted to the conductive circuit, and the magnetic circuit is arranged close to both sides of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion with respect to the magnetic circuit, the frequency sound pressure characteristic is changed by changing the distance between the diaphragm and one of the magnetic circuits. The feature is that it is possible.

Also, in the speaker in which a conductive circuit is incorporated on the diaphragm, magnetic flux is generated in the conductive circuit due to an electric signal inputted to the conductive circuit, and the magnetic circuit is arranged close to both sides of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux with respect to the magnetic circuit, the distance between the diaphragm and each of the magnetic circuits can be changed to improve the frequency sound pressure characteristic. It is characterized by being changeable.

Further, in the speaker in which a conductive circuit is incorporated on the diaphragm, a magnetic flux is generated in the conductive circuit by an electric signal inputted to the conductive circuit, and the magnetic circuit is arranged close to one side of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux with respect to the magnetic circuit, an equalizer is arranged on the other side of the diaphragm, and the equalizer is made detachable, so that the frequency sound is generated. It is characterized in that the pressure characteristics can be changed.

The frequency sound pressure characteristic can be changed by changing the equalizer to an equalizer having a different shape. Further, the frequency sound pressure characteristic can be changed by changing the distance between the diaphragm and the equalizer. Further, the frequency sound pressure characteristic can be changed by changing the distance between the diaphragm and the magnetic circuit.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a speaker according to a first embodiment of the present invention. Here, a 4-cell conductive circuit built-in diaphragm is used. The same figure (a) is a plan view, the same figure (b) is AA 'sectional drawing, the same figure (c),
(D) is an internal plan view and (e) is a bottom view. FIG. 7C shows a state where the edge fixing frame described later is removed. Further, FIG. 3D shows a state in which a magnet fixing frame described later is removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

The magnet 1 is fixed to the upper surface of a plate-shaped magnet fixing frame 2a made of, for example, a steel plate to form a magnetic circuit. Further, a vibration plate 3 is provided above the magnets 1, and a square coil-shaped conductive circuit 5 is arranged on the vibration plate 3 at a position facing each magnet 1, which is also arranged in a square shape. It is set up. The diaphragm 3 is fixed to the peripheral edge of the frame-shaped edge fixing frame 2b via the elastic edge 4.

A plate-shaped terminal fixing frame 2c is provided below the magnet fixing frame 2a.
The variable poles 7 extend upward from the four corners. Then, each variable pole 7 penetrates the magnet fixing frame 2a, reaches the edge fixing frame 2b, and supports it. On the other hand, a distance adjusting screw 8 is provided near the center of the terminal fixing frame 2c, and this and each variable pole 7 are connected by a convex belt 9. When the distance adjusting screw 8 is manually turned, its rotation is transmitted to each variable pole 7 by each belt 9 and the variable poles 7 rotate simultaneously. As a result, the edge fixing frame 2b
Can be moved up and down while being held parallel to the magnetic circuit.

Further, a terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the terminal fixing frame 2c. In addition, h is a sound emission hole opened in plural in each frame. When an electric signal is applied to the terminal 6, it is conducted to the conductive circuit 5, and a current flows through the conductor in the conductive circuit 5. As a result, a magnetic flux is generated in the conductive circuit 5, attracting or repulsing the magnetic circuit in the vicinity of the magnetic flux,
The diaphragm 3 vibrates.

FIG. 9 shows the frequency sound pressure characteristics of the speaker of this embodiment. Here, the horizontal axis represents the audio frequency (Hz) and the vertical axis represents the sound pressure level (dB). In the figure, curves a and b indicate cases where the distance between the diaphragm and the magnet is 2 mm and 3 mm, respectively. By rotating the distance adjusting screw 8, the frequency sound pressure characteristic can be freely changed between them. Especially, by changing the distance between the diaphragm and the magnet from 2 mm to 3 mm,
The reproduction band in the low frequency range is about 2.0 times.

FIG. 2 is a diagram showing a speaker according to a second embodiment of the present invention. Here again, a 4-cell conductive circuit built-in diaphragm is used. The figure (a) is a plan view, the figure (b) is an AA 'sectional view, the figure (c), (d), (e) is an internal plan view, and the figure (f) is a bottom view. FIG. 3C shows a state where a magnet edge fixing frame described later is removed. Further, FIG. 3D shows a state in which a magnet edge fixing frame, a diaphragm, and an edge, which will be described later, are removed. Further, FIG. 7E shows a state in which a magnet fixing frame described later is removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

Here, one of the combinations of the magnets 1 is fixed to the upper surface of a plate-shaped magnet fixing frame 2a made of, for example, a steel plate to form a first magnetic circuit. Further, a vibration plate 3 is provided on the upper side of the magnet 1, and a square coil-shaped conductive circuit 5 is provided on the vibration plate 3 at a position facing each magnet 1, which is also in a square shape. It is arranged. The diaphragm 3 is fixed to the peripheral edge of a lid-shaped magnet edge fixing frame 21b made of, for example, a steel plate via an elastic edge 4.

The other of the combinations of the magnets 1 is fixed to the ceiling surface of the magnet edge fixing frame 21b to form a second magnetic circuit. At this time, the polarities of the magnets 1 used in each magnetic circuit are set to be plane-symmetric with respect to the diaphragm 3. With the above configuration, the magnetic performance is improved as compared with the case of the first embodiment.

A plate-shaped terminal fixing frame 2c is provided below the magnet fixing frame 2a.
The variable poles 7 extend upward from the four corners. Each variable pole 7 penetrates the magnet fixing frame 2a, reaches the magnet edge fixing frame 21b, and supports it. On the other hand, a distance adjusting screw 8 is provided near the center of the terminal fixing frame 2c, and this and each variable pole 7 are each provided with a convex belt 9
Are linked by.

When the distance adjusting screw 8 is manually turned, the rotation thereof is transmitted to each variable pole 7 by each belt 9 and the variable poles 7 rotate at the same time. As a result, the magnet edge fixing frame 21b can be moved up and down while being held parallel to the magnetic circuit. Furthermore, the terminal fixing frame 2
A terminal 6 electrically connected to the conductive circuit 5 from the lower surface of c
Extends downward. In addition, h is a sound emission hole opened in plural in each frame. The operation is similar to that shown in the first embodiment.

The frequency sound pressure characteristic of the speaker of this embodiment is shown in FIG. Here, the horizontal axis represents the audio frequency (Hz) and the vertical axis represents the sound pressure level (dB). In the figure, curves a and b indicate cases where the distance between the diaphragm and the magnet of the first magnetic circuit is 2 mm and 3 mm, respectively. By rotating the distance adjusting screw 8, the frequency sound pressure characteristic can be freely changed between them.
Especially, the distance between the diaphragm and the first magnetic circuit is 2 mm to 3 mm.
As a result, the reproduction band in the low frequency range is about 1.3 times. However, the distance between the diaphragm and the magnet of the second magnetic circuit is constant at 3 mm.

FIG. 3 is a diagram showing a speaker according to a third embodiment of the present invention. Here again, a 4-cell conductive circuit built-in diaphragm is used. The figure (a) is a plan view, the figure (b) is an AA 'sectional view, the figure (c), (d), (e) is an internal plan view, and the figure (f) is a bottom view. FIG. 7C shows a state in which the second magnet fixing frame described later is removed. Further, FIG. 7D shows a state in which the edge fixing frame, the diaphragm and the edge which will be described later are further removed. Further, FIG. 7E shows a state in which the first magnet fixing frame described later is removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

Here, one of the combinations of the magnets 1 is fixed to the upper surface of a plate-shaped first magnet fixing frame 2ca made of, for example, a steel plate to form a first magnetic circuit. Further, the diaphragm 3 is provided above the magnet 1.
On the vibration plate 3, a square coil-shaped conductive circuit 5 is arranged at a position facing each magnet 1 also in the shape of a square. The vibrating plate 3 is fixed to the peripheral edge portion of a frame-shaped edge fixing frame 2b1 made of, for example, a steel plate via an elastic edge 4.

The other of the combinations of the magnets 1 is fixed to the lower surface of the plate-shaped second magnet fixing frame 2cb made of, for example, a steel plate, and the second upper part of the diaphragm 3 is fixed to the upper side.
It constitutes a magnetic circuit. At this time, the polarities of the magnets 1 used in each magnetic circuit are set to be plane-symmetric with respect to the diaphragm 3. With the above configuration, the first
The magnetic performance is improved as compared with the above embodiment.

Further, the first magnet fixing frame 2ca
On the lower side, a plate-shaped terminal fixing frame 2c is provided, and first variable poles 7a and second variable poles 7b are adjacent to each other and extend upward from four corners thereof. Then, the first variable pole 7a penetrates through the first magnet fixing frame 2ca, reaches the edge fixing frame 2b1, and supports this. Also, the second variable pole 7
b penetrates the edge fixing frame 2b1 and reaches the second magnet fixing frame 2cb to support it.

On the other hand, a distance adjusting screw 8 is provided near the center of the terminal fixing frame 2c, which has a first gear 8a and a second gear 8b concentrically. And
The second gear 8b has a diameter twice that of the first gear 8a.
Further, the first gear 8a and the first variable pole 7a are connected by a convex belt 9a. Also, the second gear 8b
And the second variable pole 7b are connected by a convex belt 9b. That is, the first magnet fixing frame 2c
The edge fixing frame 2b1 is, for example, 1 mm when viewed from a.
When it moves, the second magnet fixing frame 2cb becomes 2
It is designed to move mm.

When the distance adjusting screw 8 is manually turned, the rotation is changed from the first gear 8a and the second gear 8b to the belt 9 respectively.
It is transmitted to the 1st variable pole 7a and the 2nd variable pole 7b by a and 9b, and this rotates simultaneously. This allows
The edge fixing frame 2b1 and the second magnet fixing frame 2cb can be moved up and down while being held in parallel with the first magnet fixing frame 2ca. Further, the terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the terminal fixing frame 2c. Note that h
Is a sound output hole opened in plural in each frame. The operation is similar to that shown in the first embodiment.

FIG. 11 shows frequency sound pressure characteristics of the speaker of this embodiment. Here, the horizontal axis represents the audio frequency (Hz) and the vertical axis represents the sound pressure level (dB). In the figure, curves a and b indicate cases where the distance between the diaphragm and the magnets of the first and second magnetic circuits is 2 mm and 3 mm, respectively. In the present embodiment, in order to improve the frequency sound pressure characteristic in the second embodiment as effectively as possible, the second magnetic circuit is configured to interlock with the first magnetic circuit.
Here, since the magnets of the first magnetic circuit and the second magnetic circuit are evenly spaced from the diaphragm, the effect is greater than that of the second embodiment.

By turning the distance adjusting screw 8, the frequency sound pressure characteristic can be freely changed when the distance between the diaphragm and the magnet is between 2 mm and 3 mm. In particular, by setting the distance between the diaphragm and the magnet from 2 mm to 3 mm, the reproduction band in the low frequency range is about 2.0 times.

FIG. 4 is a diagram showing a speaker according to a fourth embodiment of the present invention. Here again, a 4-cell conductive circuit built-in diaphragm is used. The same figure (a) is a plan view when an equalizer is attached, the same figure (b) is its AA 'sectional view, the same figure (c) is a plan view when another equalizer is attached, and the same figure (d) is its A
A'sectional view, the same figure (e) is a plan view when the equalizer is removed, the same figure (f) is its AA 'sectional view, the same figure (g) is an internal plan view, and the same figure (h) is a bottom view. .

FIGS. 9A and 9B show a state in which an equalizer 10a described later is attached.
The equalizer 1 described later in FIGS.
The state when 0b is attached is shown. Then, FIGS. 7E and 7F show the state when the equalizer is removed. Further, FIG. 9 (g) shows a state in which a diaphragm and edges described later are removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

The magnet 1 is fixed to the bottom surface 2x of the plate 2 having a plate-like equalizer guide made of, for example, a steel plate to form a magnetic circuit. A diaphragm 3 is provided on the upper side of the magnet 1, and the diaphragm 3
A rectangular coil-shaped conductive circuit 5 is arranged above the magnets 1 at a position facing each magnet 1 in the shape of a square.
The vibrating plate 3 is fixed to the edge guide 2xb at the peripheral edge of the frame 2x with the equalizer guide via the elastic edge 4, and keeps a constant distance from the magnetic circuit.

Further, a flat plate-shaped equalizer 10a or 10b is attached to the equalizer guide 2xa at the peripheral edge of the upper frame 2x of the equalizer guide. The material of the equalizers 10a and 10b is a magnetic body, and the magnetic flux emitted from the magnet 1 is attracted toward the diaphragm 3. As a result, the equalizer 10a or 10
b is held and fixed. With this structure, the equalizers 10a and 10b having different hole shapes can be easily attached and detached. Further, a terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the frame 2x with an equalizer guide. In addition, h is a sound output hole opened in plural in the frame.

The frequency sound pressure characteristic of the speaker of this embodiment is shown in FIG. Here, the horizontal axis represents the audio frequency (Hz) and the vertical axis represents the sound pressure level (dB). In the figure, curve c shows the case without an equalizer, and curve a and curve b show the case with equalizers 10a and 10b attached, respectively. As shown in the figure, the frequency sound pressure characteristic can be changed by attaching / detaching the equalizer or attaching a different equalizer.

FIG. 5 is a diagram showing a speaker according to the fifth embodiment of the present invention. Here again, a 4-cell conductive circuit built-in diaphragm is used. The same figure (a) is a plan view when an equalizer is attached, the same figure (b) is its AA 'sectional view, the same figure (c) is a plan view when an equalizer is removed, the same figure (d),
(E) and (f) are internal plan views, and (g) is a bottom view.

FIGS. 11A and 11B show the state when the equalizer is attached. The same figure (c)
Shows the situation when the equalizer is removed. Further, FIG. 3D shows a state in which an equalizer holding frame described later is removed. Further, FIG. 6 (e) shows a state in which a diaphragm and edges described later are removed. Further, FIG. 6F shows a state in which a frame described later is removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

The magnet 1 is fixed to the bottom surface of the dish-shaped frame 2y made of, for example, a steel plate to form a magnetic circuit. A vibration plate 3 is provided on the upper side of the magnet 1, and each of the magnets 1 is placed on the vibration plate 3.
A square coil-shaped conductive circuit 5 is arranged in a square shape at a position opposite to. The diaphragm 3 is fixed to the peripheral edge of the frame 2y via an elastic edge 4 and keeps a constant distance from the magnetic circuit.

A plate-shaped terminal fixing frame 2c1 is provided on the lower side of the frame 2y, and variable poles 7c extend upward from the four corners thereof. And
Each variable pole 7c penetrates the frame 2y, reaches the frame-shaped equalizer holding frame 2d, and supports it. A flat plate-shaped equalizer 10b is attached to the peripheral portion of the equalizer holding frame 2d. The material of the equalizer 10b is magnetic, and the magnet 1
The magnetic flux emitted from is attracted toward the diaphragm 3. As a result, the equalizer 10b is held and fixed to the equalizer holding frame 2d. This structure allows
Equalizers with different hole shapes can be easily attached and removed.

On the other hand, a distance adjusting screw 8 is provided near the center of the terminal fixing frame 2c1 and is connected to each variable pole 7c by a convex belt 9c. When the distance adjusting screw 8 is manually turned, its rotation is transmitted to each variable pole 7c by each belt 9c, and the variable poles 7c simultaneously rotate. As a result, the equalizer holding frame 2d can be moved up and down while being held in parallel with the magnetic circuit.

Further, a terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the terminal fixing frame 2c1. In addition, h is a sound emission hole opened in plural in each frame. When an electric signal is applied to the terminal 6, it is conducted to the conductive circuit 5, and a current flows through the conductor in the conductive circuit 5. As a result, a magnetic flux is generated in the conductive circuit 5, attracting or repulsing the magnetic circuit in the vicinity of the magnetic flux,
The diaphragm 3 vibrates.

The frequency sound pressure characteristic of the speaker of this embodiment is shown in FIG. Here, the horizontal axis represents the audio frequency (Hz) and the vertical axis represents the sound pressure level (dB). In the figure, curves a and b indicate cases where the distance between the diaphragm and the equalizer is 2 mm and 6 mm, respectively. By rotating the distance adjusting screw 8, the frequency sound pressure characteristic can be freely changed between them.

FIG. 6 is a diagram showing a speaker according to a sixth embodiment of the present invention. Here again, a 4-cell conductive circuit built-in diaphragm is used. The same figure (a) is a plan view when an equalizer is attached, the same figure (b) is its AA 'sectional view, the same figure (c) is a plan view when an equalizer is removed, the same figure (d),
(E) and (f) are internal plan views, and (g) is a bottom view.

FIGS. 10A and 10B show the state when the equalizer is attached. The same figure (c)
Shows the situation when the equalizer is removed. Further, FIG. 3D shows a state in which an equalizer holding frame described later is removed. Further, FIG. 6 (e) shows a state in which a diaphragm and edges described later are removed. Further, FIG. 6F shows a state in which a magnet fixing frame described later is removed. In the figure, 1 is a square plate-shaped magnet, which is magnetized so that the polarities are divided vertically (thickness direction), and the polarities of adjacent magnets are opposite to each other, forming a square shape. It is arranged.

The magnet 1 is fixed to the upper surface of a plate-shaped magnet fixing frame 2a made of, for example, a steel plate to form a magnetic circuit. Further, a vibration plate 3 is provided above the magnets 1, and a square coil-shaped conductive circuit 5 is arranged on the vibration plate 3 at a position facing each magnet 1, which is also arranged in a square shape. It is set up. The diaphragm 3 is fixed to the peripheral edge of a frame-shaped edge fixing frame 2b2 made of, for example, a steel plate via an elastic edge 4.

A plate-shaped terminal fixing frame 2c is provided below the magnet fixing frame 2a.
Third variable poles 7d extend upward from the front, rear, left and right ends thereof. Then, each third variable pole 7d penetrates the magnet fixing frame 2a, reaches the frame-shaped edge fixing frame 2b2, and supports this. Furthermore, the fourth variable poles 7e extend upward from the four corners of the terminal fixing frame 2c. And each fourth variable pole 7
e is a frame-shaped equalizer holding frame 2 that penetrates the magnet fixing frame 2a and the edge fixing frame 2b2.
It reaches d and supports this.

A flat plate-shaped equalizer 10b is attached to the peripheral portion of the equalizer holding frame 2d. The material of the equalizer 10b is magnetic,
The magnetic flux emitted from the magnet 1 is attracted toward the diaphragm 3. As a result, the equalizer 10b is held and fixed to the equalizer holding frame 2d. With this structure, equalizers having different hole shapes can be easily attached and detached.

On the other hand, near the center of the terminal fixing frame 2c1, distance adjusting screws 81 and 82 are provided side by side in the front-rear direction. Distance adjusting screw 82 and each third variable pole 7
d is connected to each other by a convex belt 9d, and the distance adjusting screw 81 and each fourth variable pole 7e are connected to each other by a convex belt 9e.

When the distance adjusting screw 81 is manually turned, the rotation thereof is transmitted to each fourth variable pole 7e by each belt 9e, and they are simultaneously rotated. As a result, the equalizer holding frame 2d can be moved up and down while being held in parallel with the magnetic circuit. Also, the distance adjusting screw 82
When you manually rotate, the rotation of each belt
It is transmitted to the variable pole 7d, which rotates at the same time. As a result, the edge fixing frame 2b2 can be moved up and down while being held in parallel with the magnetic circuit.

Further, the terminal 6 electrically connected to the conductive circuit 5 extends downward from the lower surface of the terminal fixing frame 2c. In addition, h is a sound emission hole opened in plural in each frame. When an electric signal is applied to the terminal 6, it is conducted to the conductive circuit 5, and a current flows through the conductor in the conductive circuit 5. As a result, a magnetic flux is generated in the conductive circuit 5, attracting or repulsing the magnetic circuit in the vicinity of the magnetic flux,
The diaphragm 3 vibrates.

In the speaker of this embodiment, the distance between the diaphragm and the magnet and the distance between the diaphragm and the equalizer are variable, and the effect of this is the same as that described in the first and fifth embodiments. Therefore, the description of the frequency sound pressure characteristic in this embodiment is omitted.

[0056]

As described above, according to the present invention,
It is possible to provide a speaker that can be used for various purposes by making a part of the structure variable or by easily replacing parts.

That is, the reproduction band is variable according to the application. Specifically, in the first to third embodiments described above, the reproduction band in the low frequency range is variable. Also,
In the fourth and fifth embodiments, the high frequency reproduction band is variable. Further, in the sixth embodiment, both the low frequency band and the high frequency band are variable.

[Brief description of drawings]

FIG. 1 is a diagram showing a speaker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a speaker according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a speaker according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a speaker according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a speaker according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a speaker according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing an example of a conventional speaker.

FIG. 8 is a diagram showing another example of a conventional speaker.

FIG. 9 is a frequency sound pressure characteristic of the speaker of the first embodiment.

FIG. 10 shows frequency sound pressure characteristics of the speaker of the second embodiment.

FIG. 11 is a frequency sound pressure characteristic of the speaker of the third embodiment.

FIG. 12 is a frequency sound pressure characteristic of the speaker of the fourth embodiment.

FIG. 13 is a frequency sound pressure characteristic of the speaker of the fifth embodiment.

FIG. 14 is a frequency sound pressure characteristic of a conventional speaker.

FIG. 15 shows frequency sound pressure characteristics of another conventional speaker.

[Explanation of symbols]

1 magnet 2a Magnet fixed frame 2b Edge fixed frame 2c terminal fixing frame 2d equalizer holding frame 2b1 edge fixed frame 2b2 edge fixed frame 2c1 terminal fixed frame 2ca 1st magnet fixing frame 2cb Second magnet fixed frame Frame with 2x equalizer guides 2y frame 3 diaphragm 4 edges 5 Conductive circuit 6 terminals 7 variable pole 7a First variable pole 7b Second variable pole 7d Third variable pole 7e 4th variable pole 8 distance adjustment screw 8a first gear 8b 2nd gear 9 belt 9a, 9b, 9c, 9d, 9e belt 10a, 10b equalizer 21b Magnet edge fixed frame 81,82 Distance adjusting screw

Claims (7)

[Claims] 1. A loudspeaker in which a conductive circuit is incorporated on a diaphragm, wherein a magnetic flux is generated in the conductive circuit by an electric signal input to the conductive circuit, and the magnetic circuit is arranged close to the diaphragm. On the other hand, in a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux, the frequency sound pressure characteristic can be changed by changing the distance between the diaphragm and the magnetic circuit. Characteristic speaker. 2. A speaker in which a conductive circuit is incorporated on a diaphragm, wherein a magnetic flux is generated in the conductive circuit by an electric signal input to the conductive circuit, and the magnetic circuit is arranged close to both sides of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux with respect to a magnetic circuit, the frequency sound pressure characteristic is changed by changing the distance between the diaphragm and one of the magnetic circuits. A speaker characterized in that it is possible. 3. A speaker in which a conductive circuit is incorporated on a diaphragm, wherein a magnetic flux is generated in the conductive circuit by an electric signal input to the conductive circuit, and the magnetic circuit is arranged close to both sides of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux with respect to a magnetic circuit, the frequency sound pressure characteristics can be improved by changing the distance between the diaphragm and each of the magnetic circuits. A speaker characterized by being changeable. 4. A speaker in which a conductive circuit is incorporated on a diaphragm, wherein a magnetic flux is generated in the conductive circuit by an electric signal input to the conductive circuit, and the speaker is arranged close to one side of the diaphragm. In a speaker in which the diaphragm vibrates due to attraction and repulsion caused by the magnetic flux with respect to the magnetic circuit, an equalizer is arranged on the other side of the diaphragm, and the equalizer is made detachable, so that the frequency A speaker characterized in that the pressure characteristics can be changed. 5. The speaker according to claim 4, wherein the frequency sound pressure characteristic can be changed by changing the equalizer to an equalizer having a different shape. 6. The speaker according to claim 4, wherein a frequency sound pressure characteristic can be changed by changing a distance between the diaphragm and the equalizer. 7. The speaker according to claim 6, wherein a frequency sound pressure characteristic can be changed by changing a distance between the diaphragm and the magnetic circuit.