JP3365958B2 - 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 repulsive magnetic circuit type speaker, and more particularly to a speaker adapted to protect the speaker when a large input is applied.

[0002]

2. Description of the Related Art A repulsive magnetic circuit in a repulsive magnetic circuit type speaker includes a center plate made of a magnetic material, and a repulsive magnetic circuit.
This is a configuration in which two magnets are arranged so that the same poles face each other, and the voice coil is arranged in the magnetic field due to the repulsive magnetic flux generated in the outer peripheral portion of the center plate.

Further, in order to increase the driving force, FIG.
As shown in FIG. 1, the magnet 1 is arranged so that the upper and lower surfaces of the intermediate magnet 11 are opposed to each other by the center plates 13 and 13 with their polarities facing each other.
2 and 12 are arranged to form a repulsive magnetic circuit, and the first and second voice coil portions 14 and 15 are arranged on the outer peripheral portions of the center plates 13 and 13, and the polarities of the voice coil portions 14 and 15 are set. In other words, there is a speaker in which the driving force in the same direction is obtained from each voice coil unit. In the figure, 16 is a coil bobbin, 17 is a diaphragm, 18 is a damper, and 19 is a frame. FIG. 3B is a magnetic flux density distribution diagram in the repulsive magnetic circuit having the above configuration, and FIG. 4 is a wiring diagram of the speaker in FIG. 3A. In the figure, W
P indicates the winding start end position of the coil.

[0004]

However, FIG. 3 (A)
In the speaker shown in (1), since the first and second voice coil units 14 and 15 are adapted to obtain the driving force in the same direction, the amplitude is suppressed and the speaker is protected when a large input is applied. There was no way to do it.

In addition to the speaker shown in FIG. 3 (A), there is a speaker using a plurality of voice coil portions (three or more), but all of them only provide driving force in the same direction. There was nothing to suppress the amplitude and protect the speaker when a large input was applied. Therefore, there is an example in which a protection coil GC as shown in FIG. 5 is used as protection against input resistance having a low reliability and input of a certain value or more. In that case, the coil itself merely adds a heavy load, and has a drawback of deteriorating the sound quality.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to obtain a large driving force, and also to suppress the amplitude when a large input is applied to prevent destruction due to mechanical fatigue. It is to provide a speaker that can be prevented.

[0007]

According to a first aspect of the present invention, there is provided a loudspeaker comprising a center plate made of a magnetic material and magnets arranged so that the same poles face each other. It is characterized by comprising a superposition repulsion magnetic circuit in which a first repulsion magnetic circuit and a second repulsion magnetic circuit configured in the same manner as the first repulsion magnetic circuit are superposed and arranged.

As a result, the first and second voice coil portions can be arranged on the outer peripheral portions of the center plate in the first and second repulsion magnetic circuits, respectively, and further, the first and second repulsion magnetic circuits can be arranged. A large driving force can be obtained by arranging the third voice coil portion also on the outer peripheral portion of the joint portion of the magnet and joining these three voice coil portions to one diaphragm.

According to a second aspect of the present invention, the first and second repulsive magnetic circuits are provided with the first and second voice coil portions respectively disposed on the outer peripheral portions of the center plate in the first and second repulsive magnetic circuits. A third voice coil portion arranged on the outer peripheral portion of the joint portion of the magnet of the magnetic circuit,
It is characterized in that these three voice coil parts are joined to one diaphragm.

Thus, since the three voice coil portions are joined to one diaphragm, a large driving force can be obtained as described above.

According to a third aspect of the present invention, when a large input is applied, one of the three voice coil units operates so as to suppress the amplitude.

As a result, in a normal state, when driven by three voice coil units and a large input is applied, one voice coil unit among the three voice coil units acts to suppress the amplitude. This one voice coil section has both an action function and a protection action.

According to a fourth aspect of the present invention, a circuit is provided in which only one voice coil unit among the three voice coil units inverts the phase when an electric signal having a certain input value or more is applied. It is characterized by being

As a result, when an electric signal having a certain input value or more is applied, one voice coil section vibrates in the opposite direction to the other two voice coil sections, and the amplitude is suppressed and the speaker is suppressed. It can protect itself.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker according to the present invention will be described with reference to FIGS. FIG. 1A is a cross-sectional view of the speaker, and FIG. 1B is a magnetic flux density distribution diagram of the polymerized repulsion magnetic circuit. FIG. 2 is a wiring diagram of the speaker shown in FIG. 1, where (A) shows a state in which a signal below a normal fixed value is input, and (B) shows a state in which a signal above a certain fixed value is input. Is shown.

The speaker of the present invention comprises a first repulsive magnetic circuit 1 constructed by arranging magnets 3 and 3 with a center plate 4 made of a magnetic material sandwiched therebetween so that the same poles face each other, and the first repulsive magnetic circuit 1. Second repulsive magnetic circuit 1 constructed similarly to
The repulsive magnetic circuit 2 and the repulsive magnetic circuit 2 are superposed on each other via the joint 10a to form the superposed repulsive magnetic circuit 10, and the superposed repulsive magnetic circuit 10 is used.

A first voice coil section VC1 and a second voice coil section VC2 are arranged on the outer periphery of the center plate 4 in the first and second repulsive magnetic circuits 1 and 2, respectively, and the first and second voice coil sections VC1 and VC2 are arranged. Joint 1 of repulsive magnetic circuits 1 and 2
The third voice coil section VC3 is arranged on the outer peripheral portion of 0a, and these three voice coil sections VC1, VC2, VC are arranged.
3 is joined to one diaphragm 6 via a common coil bobbin 5. In the figure, 7 is a damper arranged in double, 8
Is a frame.

FIG. 1 (A) is a magnetic flux density distribution diagram of the superposition repulsion magnetic circuit 10. Ten regions indicate the range in which the direction of the magnetic flux from the center plate 4 to the voice coil portion exists. The region indicates the range in which the magnetic flux from the voice coil portion toward the center plate 4 exists.

FIG. 2A is a wiring diagram of the speaker configured as described above, and in the figure, WP indicates the winding start end position of the coil. In such connection wiring, when an electric signal is input, the first voice coil section VC1, the second voice coil section VC2, and the third voice coil section VC3.
In the magnetic flux density distribution shown in FIG.
It vibrates vertically in the same direction. Then, when an electric signal of a certain input value or more is input, the input of the third voice coil unit VC3 is the first and second voice coil units VC.
The switch 9 is provided so that the phase is inverted by 180 ° with respect to 1 and VC2.

By providing the circuit as described above, the third circuit is provided when an electric signal having a certain input value or more is input.
Since the voice coil section VC3 vibrates in the direction opposite to the first and second voice coil sections VC1 and VC2, the amplitude is suppressed and the speaker itself is protected.

[0020]

According to the speaker of the present invention, in the case of the first aspect, for example, as described in the second aspect,
The third portion is also formed on the outer peripheral portion of the joint portion of the first and second repulsive magnetic circuits.
Since it is possible to arrange the voice coil portion of, the repulsive magnetic flux of the magnet can be efficiently used and a large driving force can be obtained.

According to the third aspect of the present invention, in a normal state, the three voice coil units can be driven, and when a large input is applied, one of the three voice coil units suppresses the amplitude. Thus, this one voice coil unit has both an actual action and a protective action, and does not become a heavy load unlike the conventional protective coil.

According to a fourth aspect of the present invention, when an electric signal having a certain input value or more is applied, one voice coil section vibrates in the opposite direction to the other two voice coil sections, Amplitude is suppressed, destruction due to mechanical fatigue can be prevented, and the speaker itself can be protected.

[Brief description of drawings]

FIG. 1 shows an embodiment of a speaker according to the present invention, (A)
Is a cross-sectional view of the speaker, and (B) is a magnetic flux density distribution diagram of the polymerized repulsive magnetic circuit.

FIG. 2 shows a wiring diagram of a speaker according to the present invention, (A)
Is a circuit showing a signal input state below a certain value, and (B) is a circuit showing a state when a signal above a certain value is input.

FIG. 3 shows an example of a conventional repulsive magnetic circuit type speaker,
(A) is a cross-sectional view of the speaker, (B) is a magnetic flux density distribution diagram of the repulsion magnetic circuit.

FIG. 4 is a wiring diagram of a conventional repulsive magnetic circuit type speaker.

FIG. 5 is a wiring diagram of a speaker using a protection coil.

[Explanation of symbols]

1 First repulsive magnetic circuit 2 Second repulsive magnetic circuit 3 magnets 4 Center plate 5 coil bobbins 6 diaphragm 7 damper 8 frames 9 switch 10 Polymerized repulsive magnetic circuit 10a joint VC1 First voice coil section VC2 Second voice coil section VC3 Third voice coil section WP Coil winding start position

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 102 H04R 9/04 102

Claims (4)

(57) [Claims] 1. A first repulsive magnetic circuit configured by arranging magnets with a center plate made of a magnetic material sandwiched therebetween so that the same poles face each other, and the first repulsive magnetic circuit and the first repulsive magnetic circuit. And a second repulsive magnetic circuit and a superposed repulsive magnetic circuit in a superposed arrangement. 2. A joining portion between the first and second voice coil portions respectively arranged on the outer peripheral portions of the center plates of the first and second repulsion magnetic circuits and the magnets of the first and second repulsion magnetic circuits. And a third voice coil section disposed on the outer periphery of the three voice coil sections.
2. It is joined to two diaphragms.
The described speaker. 3. The speaker according to claim 2, wherein one of the three voice coil units operates so as to suppress the amplitude when a large input is applied. 4. A circuit for inverting the phase of only one of the three voice coil units when an electric signal having a certain input value or more is applied. The speaker according to items 2 and 3.