JP3137218B2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin and lightweight speaker utilizing a so-called repulsive magnetic field.

[0002]

2. Description of the Related Art Conventionally, two thin disk-shaped or ring-shaped magnets are formed on both sides of a non-magnetic spacer, with the same polarity facing each other. No. 40-2 microphones and speakers
No. 5922, Japanese Utility Model Publication 2-30957, and the document "JAS Conference '92 Proceedings, Ultralight Speakers Applying Repulsive Magnetic Field (Hiroyuki Kumakura and three others co-authored by Kenwood Corporation)".

[0003]

However, in each of the above-mentioned prior arts, there is a problem that there is a large transmission loss of the driving force from the voice coil to the diaphragm, and the support system of the voice coil is a rolling mechanism. Therefore, there is also a problem that high accuracy and high sound quality cannot be obtained. In addition, since the outer yoke (ring yoke) is incorporated, the diaphragm is separated from the field portion by a stroke, so that the diaphragm is connected, and there is a limit to the reduction in thickness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the transmission loss of a driving force from a voice coil to a diaphragm while being thin and lightweight. Release from the rolling mechanism,
It is an object of the present invention to provide a speaker capable of obtaining high precision and high sound quality.

Another object of the present invention is to provide a speaker that is thin, lightweight, and can be configured as a bass unit.

Another object of the present invention is to provide a speaker which can effectively use a leakage magnetic field in a magnetic circuit in which a magnetic path is not closed and can improve the utilization rate of a magnet.

Still another object of the present invention is to provide a constant impedance speaker by combining a plurality of coils and using an inductance reduction function.

[0008]

In order to achieve the above object, the present invention forms a repulsive magnetic field by arranging two magnets in magnetic directions repelling each other. A voice coil wound around the center is installed, a diaphragm is coupled to the center of the outer periphery of the voice coil, and both ends of the outer periphery of the voice coil bobbin are separated from each other by two The voice coil is supported by a damper, and the support system for the voice coil is formed in a symmetrical shape with a central axis orthogonal to the axial direction of the voice coil as a target axis.

Further, in order to achieve the above object, the present invention provides a mechanical filter in which an inner peripheral portion of a diaphragm is provided, and a diaphragm is connected to a central portion of an outer periphery of the voice coil via the mechanical filter. is there.

Further, in order to achieve the above object, the present invention is that at least one of the voice coil bobbin and the voice coil is formed of a magnetic material.

In order to achieve the above object, the present invention provides a voice coil having a first coil wound around a single voice coil bobbin at a position corresponding to one magnet, and a voice coil wound at a position corresponding to a spacer. The second coil that has been turned and the third coil that has been wound at a position corresponding to the other magnet
And a coil in which the winding directions of the first and third coils are opposite to the winding direction of the second coil.

[0012]

According to the present invention, two magnets are arranged in a magnetic direction repelling each other with a spacer interposed therebetween to form a repulsive magnetic field, and a voice coil is installed in the repulsive magnetic field to form an electrodynamic type. Since it is (yoke) less, it can be formed extremely thin and lightweight. Also, in particular, in the present invention, since the diaphragm is directly connected to the voice coil, the transmission loss of the driving force from the voice coil to the diaphragm can be almost eliminated, and therefore, the rise of the diaphragm with respect to the input signal to the voice coil can be reduced. Can be performed very faithfully. Furthermore, a voice coil is wound around the center of the outer periphery of the voice coil bobbin, a diaphragm is connected to the center of the outer periphery of the voice coil, and the diaphragm is connected to the center point of the operation of the voice coil. In addition, since both ends of the outer periphery of the voice coil bobbin are respectively connected to the damper, and the support system of the voice coil is formed in a symmetrical shape with the center axis orthogonal to the axial direction of the voice coil as the target axis, the conventional rolling method is used. Freed from the mechanism, high precision and high sound quality can be obtained.

Further, in the present invention, since the voice coil and the diaphragm are connected via the mechanical filter, it is possible to constitute a thin and lightweight bass unit.

Further, according to the present invention, at least one of the voice coil bobbin and the voice coil is formed of a magnetic material.
Focus the magnetic flux on the voice coil, reduce the leakage of the magnetic flux,
The efficiency of the magnet can be increased, and the efficiency can be improved.

In the present invention, the first, second, and third coils are wound around a single voice coil bobbin at positions corresponding to one magnet, a spacer, and the other magnet, and are positioned at positions corresponding to the spacer. A voice coil is formed by reversing the winding directions of the first and third coils wound at positions corresponding to the magnet with respect to the winding direction of the second coil wound around I have. As a result, the driving force is obtained by the second coil from the repulsive magnetic flux between the two magnets, and the driving force is obtained by the first and third coils from the other end of the magnet in which the magnetic field is distributed in the opposite direction. Therefore, sufficient driving force can be obtained despite the thinness and light weight. In addition, the mutual inductance reduction function suppresses a rise in impedance in a high frequency range, thereby providing a constant impedance. This also contributes to improvement of high frequency characteristics.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

In the first embodiment shown in FIG.
The magnets 1 and 2 are disposed at the center of the frame 11 having a, with the spacer 3 interposed therebetween. The magnets 1 and 2 are formed in a disk shape and are magnetized in the thickness direction. These magnets 1 and 2 are preferably anisotropic sintered magnets (neodymium magnets)
Use The opposing surfaces of the magnets 1 and 2 with the spacer 3 interposed therebetween are magnetized in magnetic directions repelling each other, that is, as magnetic poles like N-N poles.
A repulsive magnetic field 4 is formed. The spacer 3 is formed of a magnetic material such as SS41, but may be formed of a non-magnetic material, or may be formed only with a gap without interposing the spacer 3 in particular.

A voice coil 6 is provided in the repulsive magnetic field 4. The voice coil 6 includes the magnet 1,
The voice coil bobbin 5 is provided around the center of the outer periphery of the voice coil bobbin 5 which is provided so as to vibrate.

At the center of the outer periphery of the voice coil 6,
The inner peripheral portion of the diaphragm 8 is connected. The diaphragm 8 is, for example, a flat plate having a honeycomb shape. The outer end of the diaphragm 8 is connected to the front and rear frames 1.
It is sandwiched between 1 and 12.

On the other hand, both ends of the voice coil bobbin 5 are located at front and rear dampers 9, 1 which are spaced apart from each other.
It is connected inside 0. The outer ends of these dampers 9 and 10 are connected to the front and rear frames 11 and 12, respectively.

As described above, since the yoke (yoke) is not used in the configuration of the magnetic circuit in the first embodiment, the thickness and the weight are reduced by at least the yoke and the stroke as compared with the prior art using the yoke. Is possible.

Further, since the diaphragm 8 is directly connected to the voice coil 6, there is almost no loss of transmission of the driving force from the voice coil 6 to the diaphragm 8, so that the diaphragm 8 responds to an input signal to the voice coil 6. Rising can be performed very faithfully.

Further, the diaphragm 8 is connected to the center of the operation of the voice coil 6 which is the center of the outer periphery of the voice coil 6, and dampers 9 and 10 are connected to both ends of the outer periphery of the voice coil bobbin 5. The support system of the coil 6 is formed by a central axis YY 'orthogonal to the axial direction XX' of the voice coil 6.
Since it is formed in a target type having a target axis, it is released from the conventional rolling mechanism, and high precision and high sound quality can be obtained.

Second Embodiment FIG. 2 shows a second embodiment of the present invention. In this embodiment, a diaphragm 8 is connected to a central portion of the outer periphery of a voice coil 6 via a mechanical filter 7, and is thin. Is characterized in that a low tone is obtained. Since other configurations, operations, and the like are the same as those of the above-described first embodiment, the same members are denoted by the same reference numerals, and detailed description will be omitted.

FIG. 3 shows the magnetic distribution of the repulsive magnetic field, and FIG. 4 is a conceptual diagram of a third embodiment of the present invention.

As shown in FIG. 3, the two disk-type magnets 1 and 2 are arranged in a magnetic direction that repels each other with a spacer 3 interposed therebetween, and a magnetic circuit that forms a repulsive magnetic field.
In the magnetic circuit whose magnetic path is not closed, as can be seen from the magnetic flux distribution G, since the magnetic flux does not converge, the leakage of the magnetic flux is large and the utilization ratio of the magnets 1 and 2 is poor.

In the fifth embodiment of the present invention shown in FIG. 4, a short cylindrical magnetic material a is provided at the center of the outer periphery of the voice coil bobbin 5, and the voice coil 6 is mounted on the outer periphery of the magnetic material A. It is winding.

As described above, by using the magnetic material A for a part of the voice coil bobbin 5, the magnetic flux distribution G shown in FIG.
Inside, the voice coil 6 is arranged and the magnetic flux is used efficiently,
Magnetic flux leakage can be reduced. Thereby, the utilization rate of the magnets 1 and 2 can be increased, and the efficiency can be increased.

In the third embodiment, the voice coil 6 may be formed of a magnetic material, and both the voice coil bobbin 5 and the voice coil 6 may be formed of a magnetic material.

Fourth embodiment: FIG.
FIG. 6 is an explanatory view of a repulsive magnetic field formed by a single disk-shaped magnet, and FIG. 6 is an explanatory view of the shape of a voice coil as a main part of a fourth embodiment of the present invention.

As shown in FIG. 5, in a magnetic circuit in which two disk-type magnets 1 and 2 are arranged in a magnetic direction that repels each other with a spacer 3 interposed therebetween, in a magnetic circuit in which a repulsive magnetic field is formed, the magnets 1 and 2 A strong magnetic field is generated in a part of
Opposite magnetic fields are generated in portions b and c around the magnets 1 and 2.

Therefore, in the fourth embodiment of the present invention shown in FIG. 6, the first coil 6 wound around the outer periphery of the voice coil bobbin 5 at a position substantially corresponding to the one magnet 1 is provided.
a and the second coil wound at a position substantially corresponding to the spacer 3.
And the third coil 6c wound at a position substantially corresponding to the other magnet 2 to form the voice coil 6. Then, as shown by the arrow in FIG. 6, the first and second winding directions of the second coil 6b are changed.
The winding directions of the third coils 6a and 6b are reversed.

The voice coil 6 is connected to the magnets 1 and 2
The driving force is obtained by the second coil 6b from the portion a where a strong magnetic field is generated by arranging it in the repulsive magnetic field formed by the spacers 3 and the b and c where the magnetic fields in the opposite directions are generated. The first and third coils 6a,
The driving force can be obtained by 6c. Accordingly, a large driving force can be obtained while reducing the thickness and weight of the portion forming the magnetic circuit.

[0035]

As can be seen from the above description, the present invention has the following effects.

Claim 1: The two magnets are arranged in a direction of repulsion to form a repulsive magnetic field, and a repulsive magnetic field is formed. A voice coil is installed in the repulsive magnetic field to make the repulsive magnetic field yokeless. effective. Also,
Since the voice coil is wound around the outer periphery of the voice coil bobbin and the diaphragm is directly connected to the center of the outer periphery of the voice coil, transmission loss of the driving force from the voice coil to the diaphragm can be almost eliminated. There is an effect that the rise of the diaphragm with respect to the input signal to the coil can be performed very faithfully. Furthermore, a voice coil is wound around the center of the voice coil bobbin to form a coil, a diaphragm is connected to the center of the voice coil bobbin, and both ends of the voice coil bobbin are connected to dampers, respectively. Since the support system of the voice coil is formed in a symmetrical shape with the axial direction of the voice coil as a target axis, there is an effect that the conventional rolling mechanism is released and high precision and high sound quality can be obtained.

Claim 2: Since the voice coil and the diaphragm are connected via a mechanical filter, there is an effect that a lightweight, thin and low sound unit can be formed.

According to a third aspect of the present invention, since at least one of the voice coil bobbin and the voice coil is formed of a magnetic material, a magnetic flux is focused on the voice coil in a magnetic circuit whose magnetic path is not closed so that the magnetic flux acts efficiently. In addition, there is an effect that the leakage of magnetic flux can be reduced, the utilization rate of the magnet can be increased, and the efficiency can be improved.

Preferably, the first, second, and third coils are wound around the voice coil bobbin at positions corresponding to the one magnet, the spacer, and the other magnet, and wound around the position corresponding to the spacer. The voice coil is formed such that the winding directions of the first and third coils wound around the position corresponding to the magnet are opposite to the winding direction of the second coil. As a result, the driving force is obtained from the repulsive magnetic flux between the two magnets by the second coil,
Since the driving force is obtained by the first and third coils from the periphery of the magnet where the opposite magnetic field is generated, a large driving force can be obtained despite being thin and lightweight. There is. In addition, a constant impedance characteristic can be obtained by an inductance reduction effect generated between the coils. This is also effective for improving high frequencies.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a magnetic flux distribution of a magnetic circuit in which a repulsive magnetic field is formed by two disk-type magnets sandwiching a spacer.

FIG. 4 is a conceptual diagram showing a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a magnetic field of a magnetic circuit formed by two disk-type magnets sandwiching a spacer.

FIG. 6 is an explanatory diagram showing a winding state of a voice coil which is a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 1, magnet 3 spacer 4 repulsive magnetic field 5 voice coil bobbin 6 voice coil 7 mechanical filter 8 diaphragm 9,10 damper 11,12 frame 11a sound hole A magnetic material

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-7395 (JP, A) JP-A-5-22794 (JP, A) JP-A-1-98400 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04R 9/04 105 H04R 9/02 102

Claims (4)

(57) [Claims] 1. A repelling magnetic field is formed by arranging two magnets in magnetic directions repelling each other, and a voice coil wound around a substantially central portion of an outer periphery of a voice coil bobbin is installed in the repelling magnetic field. The inner peripheral portion of the diaphragm is connected to the central portion of the outer periphery of the voice coil, and both ends of the outer periphery of the voice coil bobbin are supported by two dampers spaced from each other. The speaker according to claim 1, wherein the support system is formed in a target type having a center axis orthogonal to an axial direction of the voice coil as a target axis. 2. The speaker according to claim 1, wherein a mechanical filter is provided on an inner peripheral portion of the diaphragm, and the diaphragm is coupled to a central portion of an outer periphery of the voice coil via the mechanical filter. Speaker. 3. The speaker according to claim 1, wherein at least one of the voice coil bobbin and the voice coil is formed of a magnetic material. 4. The speaker according to claim 1, wherein said voice coil is wound around a single voice coil bobbin at a position corresponding to one magnet, and a position corresponding to a spacer. And a third coil wound at a position corresponding to the other magnet, and the first and third coils are wound in the winding direction of the second coil. A speaker characterized by being formed by a coil whose winding direction is reversed.