JPH11266495A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a satisfactory balance of the oscillation part of a damper and to improve the linearity very much by giving a vertically and horizontally symmetrical shape to the hollow doughnut damper which supports a voice coil and has air-permeability. SOLUTION: A first damper 1A is formed with air-permeable cloth as the base cloth so as to have a hollow doughnut section, and an inner peripheral edge part 1Aa of the doughnut part is coupled to a voice coil 4, and an outer peripheral edge part 1Ab of the doughnut part is coupled. To a frame 5. Thus, the damper is deformed while following up the vertical movement of the voice coil 4 well. Since the shape of the damper 1A is formed like a doughnut and is made vertically symmetrical, the difference in stiffness between upward displacement and downward displacement is considerably reduced. Thus, the linearity of the damper 1A is considerably improved, and the nonlinear distortion for a large amplitude is reduced.

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 kinds of audio equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to FIG.

According to FIG. 1, reference numeral 2 denotes a magnetic circuit, which comprises a lower plate 2a, a magnet 2b, and an upper plate 2c. Reference numeral 5 denotes a frame coupled to the magnetic circuit 2, and reference numeral 6 denotes a diaphragm having an outer periphery coupled to the frame 5 via an edge portion 6a. The voice coil 4 fitted in the formed magnetic gap 3 is connected.

[0004] Reference numeral 1 denotes a breathable damper having an outer periphery coupled to the frame 5 and an inner periphery coupled to the voice coil 4 and a cloth supporting the voice coil 4 as a base cloth. This damper 1 is generally provided with a corrugation of a corrugation from the inner circumference to the outer circumference. However, the damper 1 has a resin substrate which is linear with respect to the vertical movement of the voice coil 4, that is, has good linearity. A so-called butterfly damper provided with a slit was sometimes used.

[0005]

However, a long-ellipse speaker or a small high-input speaker using the corrugation type damper 1 has an insufficient elongation ratio with respect to the amplitude of the diaphragm 6 and cannot withstand the speaker. The input load to the is limited. In addition, there is a problem in that the linearity is poor and there is an element that causes the generation of abnormal sound in sound quality.

The loudspeaker using the above-mentioned butterfly damper which solves the above problems can improve the input resistance and the linearity of the loudspeaker. It is easy to enter the magnetic gap 3 of the magnetic circuit 2 and is likely to be a factor of abnormal sound, which has a problem in quality.

The present invention solves the above-mentioned conventional problems, and can flexibly cope with the amplitude of a loudspeaker while having a small diameter, can increase the input load to the loudspeaker, and has excellent linearity. It is an object of the present invention to provide a speaker capable of reproducing with improved sound quality.

[0008]

In order to solve the above problems, a speaker according to the present invention comprises at least a magnetic circuit, a frame connected to the magnetic circuit, a diaphragm having an outer periphery connected to the frame, and A voice coil fitted in a magnetic gap formed in the magnetic circuit coupled to the inner periphery of the diaphragm; and a vent supporting the voice coil having an inner periphery coupled to the voice coil and an outer periphery coupled to the frame. And a hollow donut-shaped damper having the property, the hollow donut-shaped damper is up and down,
Since the right and left sides have the same shape, the vibrating part of the damper has a well-balanced symmetrical shape in the vertical direction, so that the linearity of the damper is very good, and it is possible to provide a speaker with excellent sound quality. Therefore, it is possible to provide an input-resistant speaker.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker according to the present invention according to claim 1 of the present invention comprises at least a magnetic circuit, a frame connected to the magnetic circuit, a diaphragm having an outer periphery connected to the frame, A voice coil fitted in a magnetic gap formed in the magnetic circuit coupled to the inner periphery of the plate; and a breathable air bearing supporting the voice coil having an inner periphery coupled to the voice coil and an outer periphery coupled to the frame. And a hollow donut-shaped damper that has a hollow donut-shaped damper that supports the periphery of the voice coil. Therefore, it is possible to provide a speaker having excellent sound quality in which the linearity of the damper is very good and the high-frequency distortion of the speaker is reduced.

Further, in the above damper having a donut-shaped cross section, since the vibrating portion has a vertically symmetrical shape with a well-balanced vertical direction as described above, a large amplitude can be ensured and a speaker with excellent input resistance can be provided. Provision is also possible.

According to a second aspect of the present invention, the hollow damper of the first aspect is filled with a flexible material having air permeability. Frequency of speaker (Fo)
This makes it possible to provide a speaker with little change in the size.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. In the description, the same parts as in the related art will be denoted by the same reference numerals, and description will be omitted.

(Embodiment 1) FIG. 1 is a side sectional view of an embodiment of a speaker according to the present invention, and FIG. 2 is a sectional perspective view for explaining a relationship between a speaker damper and a voice coil, which are essential parts of the speaker. FIG. 3 is a side sectional view of the same, and FIG. 4 is a hysteresis curve diagram showing the linearity of a damper as the main part.

The present embodiment is different from the prior art shown in FIG. 6 only in the damper 1A. The damper 1A has a donut shape having a hollow cross section based on a permeable fabric. The inner peripheral edge 1Aa of the donut portion is coupled to the voice coil 4 and the outer peripheral edge 1Ab of the donut portion is coupled to the frame 5. As a result, the voice coil 4 can be deformed with good followability.

FIG. 4 is a hysteresis curve diagram of the damper 1A as a main part and the conventional damper 1. As will be apparent from this, the damper 1A of the present embodiment has greatly improved linearity and reliability. It has been confirmed that the nonlinear distortion at the time of large amplitude can be reduced.

It is considered that this is because the difference between the stiffness of the upward displacement and the downward displacement was extremely small by making the shape of the damper 1A donut-shaped and vertically symmetric.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a sectional view of a speaker damper, which is a main part of the speaker according to one embodiment of the present invention.

A damper 1B is different from the damper 1A of the first embodiment in that the doughnut-shaped hollow portion 1Bc of the vibrating portion 1Ba is provided with a flexible urethane foam 7 having air permeability.
Is filled.

In the loudspeaker constructed using the above damper 1B, since the hollow portion 1Bc of the damper 1B is filled with the urethane foam 7, the resilience of the damper 1B against deformation due to the vertical movement amplitude is improved, and the damper 1B The life characteristics are improved, the resonance frequency Fo of the speaker is hardly changed over time, and the life characteristics of the speaker are also improved. On the other hand, this can also greatly improve distortion at the time of large input.

[0020]

As described above, the loudspeaker of the present invention is constituted by using a donut-shaped damper, so that the vibrating portion of the damper has a well-balanced symmetric shape in the up-down direction, thereby improving the linearity of the damper. An object of the present invention is to provide a speaker having improved sound quality with improved harmonic distortion.

Further, in the above damper having the donut-shaped cross section, since the vibrating portion has a vertically symmetric shape with a well-balanced vertical direction as described above, a large amplitude can be ensured and a speaker with excellent input resistance can be provided. Provision is also possible.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional perspective view of the vicinity of a damper, which is the main part.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a hysteresis characteristic diagram of the same.

FIG. 5 is a side sectional view showing the vicinity of a damper, which is a main part of the other embodiment.

FIG. 6 is a side sectional view of a conventional speaker.

[Explanation of symbols]

 Reference Signs List 1A First damper 1B Second damper 2 Magnetic circuit 3 Magnetic gap 4 Voice coil 5 Frame 6 Diaphragm 7 Urethane foam

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyasu Takase 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] At least a magnetic circuit, a frame coupled to the magnetic circuit, a diaphragm having an outer periphery coupled to the frame, and a magnetic circuit formed in the magnetic circuit coupled to an inner periphery of the diaphragm. A speaker comprising: a voice coil fitted into a gap; and a hollow doughnut-shaped damper having an inner periphery coupled to the voice coil and an outer periphery coupled to the frame to support the voice coil. 2. The speaker according to claim 1, wherein the hollow portion of the damper is filled with a flexible material having air permeability.