JPH10126881A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high sound quality speaker by restraining a division diaphragm by the natural resonance of diaphragm decided by the diameter, thickness of material, intensity, of the diaphragm and reducing a fluctuation in sound pressure frequency characteristic, harmonic distortion or the like, in a speaker applied to video/audio equipment. SOLUTION: By utilizing the diaphragm 6 which is asymmetrical to all axes orthogonal to the central axis of a voice coil 5 and is adjusted in its mass balance by a thickness of material or impregnating diaphragm reinforcement so that its center-of-gravity point is positioned on the central axis of the voice coil 5, divided oscillation is only generated respectively at a part of the diaphragm 6 by plural resonant frequencies to disperse an energy by resonance, so that the fluctuations in the sound pressure frequency, harmonic distortion or the like is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various video and audio equipment.

[0002]

2. Description of the Related Art Conventionally, a dynamic type has been used as the most general method for constructing a speaker.

[0003] The conventional speaker as described above will be described below with reference to the drawings. FIG. 4 is a side sectional view of a conventional speaker. In the figure, 9 is a field portion, 10 is a magnetic gap, 11 is a frame, 12 is a damper, 13 is a voice coil, 14 is a diaphragm, 15 is an edge, and 16 is a dust cap. A frame 11 is connected to the field section 9, a diaphragm 14 is attached to the peripheral edge of the frame 11 via an edge 15, and a voice coil 13 is connected to the lower surface of the central portion of the diaphragm 14, and the middle of the voice coil 13 The portion is supported by a damper 12 so that the lower portion of the voice coil 13 fits correctly into the magnetic gap 10, and a dust cap 16 is attached to the upper surface of the central portion of the diaphragm 14.

The operation of the loudspeaker configured as described above will be described below. When an electric signal is applied to the voice coil 13, the driving force generated by the magnetic field generated in the magnetic gap 10 and the current flowing through the voice coil 13 is transmitted to the voice coil 13, and the diaphragm 14 connected thereto is driven. Vibrates.

[0005]

However, in the above-mentioned conventional configuration, the natural resonance of the diaphragm 14 determined by the diameter, the material thickness, and the strength of the diaphragm 14 occurs at a plurality of frequencies, particularly in a middle and high frequency range. Causes split vibration. This causes disturbance of the sound pressure frequency characteristics of the speaker (occurrence of peak dip) and occurrence of harmonic distortion.
An object of the present invention is to solve the above-mentioned conventional problems and to provide a speaker with high sound quality.

[0006]

According to the present invention, there is provided a loudspeaker comprising at least a field portion provided with a magnetic gap, a frame mounted on the field portion,
A voice coil inserted into the magnetic gap is coupled to a central portion, and an outer periphery is directly or indirectly coupled to the frame, and the voice coil is asymmetric with respect to an axis orthogonal to a central axis of the voice coil. Since it is composed of a diaphragm whose center of gravity is located substantially on the center axis of the coil, the divided vibration due to the natural resonance of the diaphragm does not occur on the whole surface of the diaphragm by one resonance frequency as in the prior art, Since only one part is generated at each of the resonance frequencies, energy due to resonance is dispersed, and a high-quality speaker in which disturbance of sound pressure frequency characteristics and harmonic distortion are suppressed can be provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a field portion provided with at least a magnetic gap, a frame mounted on the field portion, and a magnetic gap provided at a center portion. Combine the embedded voice coil and directly or indirectly connect the outer circumference to the above frame,
The diaphragm is asymmetric with respect to an axis perpendicular to the center axis of the voice coil and has a diaphragm whose center of gravity is substantially located on the center axis of the voice coil. Has a plurality of resonance frequencies, and the divided vibration occurs only at a part of each of the plurality of resonance frequencies, so that energy due to resonance is dispersed, thereby providing a high-quality speaker in which disturbance in sound pressure frequency characteristics and harmonic distortion are suppressed. You can do it.

[0008] The invention described in claim 2 of the present invention is claimed in claim 1.
The mass balance of the diaphragm described in was adjusted by adjusting the material thickness or impregnating the diaphragm so that the center of gravity was located substantially on the center axis of the voice coil. It can be set during the manufacturing process of the diaphragm.

An embodiment of a speaker according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a speaker according to an embodiment of the present invention, FIG. 2 is a side sectional view of the speaker, and FIG. 3 is a frequency characteristic diagram. In the figure, 1 is a field part, 2 is a magnetic gap, 3 is a frame, 4 is a damper,
5 is a voice coil, 6 is a diaphragm, 7 is an edge, and 8 is a dust cap. The frame 3 is connected to the field portion 1, and the diaphragm 6 is attached to the periphery of the frame 3 via the edge 7. The voice coil 5 is connected to the lower surface of the central portion of the diaphragm 6, the intermediate portion of the voice coil 5 is supported by the damper 4, so that the lower portion of the voice coil 5 fits correctly into the magnetic gap 2, and the diaphragm 6 A dust cap 8 is attached to the upper surface of the central part of the device.

The diaphragm 6 has an asymmetric shape with respect to all axes perpendicular to the central axis of the voice coil 5 and has a mass balance so that the center of gravity is located substantially on the central axis of the voice coil 5. Adjusted by thickness.

The operation of the loudspeaker configured as described above will be described below. When an electric signal is applied to the voice coil 5, the driving force generated by the magnetic field generated in the magnetic gap 2 and the current flowing through the voice coil 5 is transmitted to the voice coil 5, and the diaphragm 6 connected thereto is driven. Vibrates.

FIG. 3 shows the frequency characteristics of the loudspeaker of the embodiment and the conventional loudspeaker. A is the sound pressure frequency characteristic of the conventional speaker, B is the sound pressure frequency characteristic of the speaker of the present invention, C is the harmonic distortion characteristic of the conventional speaker, and D is the harmonic distortion characteristic of the speaker of the present invention.

As is apparent from the frequency characteristic diagram of FIG. 3, the loudspeaker of the present embodiment has less disturbance and higher harmonic distortion in the sound pressure frequency characteristic than the conventional loudspeaker. This is considered to be due to dispersion and suppression of the split resonance of the diaphragm 6.

In the above embodiment, the mass balance of the diaphragm 6 is adjusted by the material thickness so that the center of gravity is substantially located on the center axis of the voice coil 5, but is adjusted by impregnation with the diaphragm reinforcing agent. You can do it.

[0015]

As described above, according to the present invention, the diaphragm is asymmetric with respect to the axis perpendicular to the central axis of the voice coil, and the center of gravity is located substantially on the central axis of the voice coil. The energy due to the resonance of the diaphragm is split,
It is possible to provide a high-quality sound speaker in which disturbance of high-frequency characteristics and harmonic distortion are suppressed.

[Brief description of the drawings]

FIG. 1 is a plan view of a speaker according to an embodiment of the present invention.

FIG. 2 is a sectional side view of the same.

FIG. 3 is a frequency characteristic diagram

FIG. 4 is a side sectional view of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Field part 2 Magnetic gap 3 Frame 4 Damper 5 Voice coil 6 Diaphragm 7 Edge 8 Dust cap

Claims (2)

[Claims] At least a field portion provided with a magnetic gap, a frame mounted on the field portion, and a voice coil fitted in the magnetic gap at a central portion are connected to each other directly or externally. A speaker that is indirectly coupled to the frame and that is asymmetric with respect to an axis perpendicular to the center axis of the voice coil and that has a center of gravity substantially located on the center axis of the voice coil; 2. The diaphragm according to claim 1, wherein the mass balance is adjusted by adjusting the material thickness or impregnating the diaphragm so that the center of gravity is substantially located on the central axis of the voice coil. Speaker.