JP3127669B2 - 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 loudspeaker, and more particularly to a shape of an edge for supporting a diaphragm.

[0002]

2. Description of the Related Art A general structure of a speaker unit in a speaker is simply shown in FIG. FIG. 7B shows the speaker unit viewed from the front.
In FIG. 7A, 1 is a yoke, 2 is a magnet, 3 is a voice coil, 4 is a damper, 5 is a diaphragm, 6 is an edge, and 7 is a frame. A magnetic circuit is formed by the yoke 1, the magnet 2, and the voice coil 3. The upper end of the voice coil 3 is supported by a damper 4 and connected to a diaphragm 5. Further, the diaphragm 5 is supported by the frame 7 by joining the edge 6 to the outer peripheral portion thereof and joining the edge 6 to the frame 7. The vibration plate 5 responds to the vibration of the voice coil 3 in the magnetic circuit.
The vibration system is configured so that is vibrated.

Here, the edge 6 is formed in a ring shape as can be seen from FIG. 7 (b), and a diaphragm joining portion 6c which is an inner peripheral end thereof is joined to an outer periphery of the diaphragm 5, and an outer peripheral end thereof. A certain frame joint 6 a is joined to the frame 7. As can be seen from FIG. 7B and FIG. 8 which shows the edge 6 in a cross-sectional view, the edge 6 is
And the diaphragm joint 6c are connected by a semicircular section 6b in cross section. Frame joint 6
a, semicircular section 6b, and diaphragm connecting section 6c are integrally formed with substantially the same thickness.

[0004]

By the way, in the conventional loudspeaker having such a structure, especially when the rigidity of the diaphragm 5 is high, as can be seen from FIG. 9 showing the frequency characteristic of the output sound pressure level, as shown in FIG. (Band between 1000 and 5000 Hz), the characteristics deteriorate in a valley shape as indicated by the dashed line,
There is a problem that a so-called middle valley is generated in frequency characteristics.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve such problems and to obtain good frequency characteristics. For this purpose, a diaphragm interposed between a diaphragm and a frame is used. As the edge to be supported by the frame, the substantially semicircular portion in cross section is the first portion closer to the diaphragm joint than the substantially central portion .
The thickness is the second thickness closer to the frame joining portion than the substantially central portion.
It is formed in a two-stage thickness so as to be 1.5 to 3 times thicker than that , and the substantially semicircular section and the diaphragm joint have a straight or cross-sectional shape on the speaker front side. Provided is a speaker which is formed to be continuous in a curved shape .

[0006]

[Function] The mid-range valley is generated on the sound pressure frequency characteristic.
It is considered that the edge vibrates in an opposite phase with respect to the diaphragm due to resonance generated in the band, and the sound is canceled by the diaphragm and the edge. Here, the edge is thickened on the joint portion side with the diaphragm, and the cross-sectional shape on the speaker front side between the substantially semicircular section and the diaphragm joint portion is continuous in a linear or curved shape. Thus, the vibration of the edge with respect to the diaphragm can be suppressed, and the occurrence of the vibration of the opposite phase can be avoided.

[0007]

1 (a) and 1 (b) show a first embodiment of a speaker according to the present invention.
3A and 3B are an explanatory view and a front view of a structure of a speaker unit as an example of FIG. The structure of the speaker unit shown in FIG. 1A is substantially the same as the structure shown in FIG.
The same portions are denoted by the same reference numerals and description thereof will be omitted. In this embodiment, the edge shape is different from the conventional example shown in FIGS. 7 and 8, and reference numeral 10 denotes an edge in this embodiment. FIG. 2 is an enlarged sectional view of the edge 10.
It is.

As shown in FIG. 1B, the edge 10 is formed in a ring shape, the outer peripheral end of which is a frame joint 10a to be attached to the frame 7, and the inner peripheral end of which is a diaphragm 5
And a diaphragm joint 10c adhered to an outer peripheral end portion (indicated by a broken line in FIG. 1B), and a cross-sectional shape between the frame joint 10a and the diaphragm joint 10c is substantially semicircular. It is continued by a semicircular section 10b in cross section.

As can be clearly seen from FIG. 2, the edge 10 has a cross-section with respect to the thickness (Ta) on the side of the frame joining portion 10a from the center (the top of the semicircle) of the semicircular portion 10b. Diaphragm connecting portion 1 from the center of semicircular portion 10b
It is formed so that the thickness on the 0c side is about 1.5 to 3 times as thick.

Further, a front side portion (F in the figure) of a portion continuous from the semicircular section 10b to the diaphragm joining section 10c.
Section) is linear, that is, when viewed from the front side, the semicircular section 10b and the diaphragm joint 10
The c is not broken at the boundary of FIG.
(B)). Such an edge 10 is formed from a frame joint 10a to a diaphragm joint 10 by, for example, a rubber-based material.
Up to c are integrally formed.

The edge 10 is formed in such a shape,
By being fixed to the diaphragm 5, vibration of the edge with respect to the diaphragm 5 can be suppressed, and thereby sound pressure frequency characteristics can be improved. When the frequency characteristics of the sound pressure level by the speaker corresponding to this example were measured, the result as shown in FIG. 3 was obtained. That is, 1000 ~
The reduction in sound pressure level in the 5000 Hz band was eliminated, that is, valleys in the middle range could be eliminated.

It is to be noted that if the thickness of the diaphragm connecting portion 10c is about 1.5 to 3 times the thickness of the semicircular section 10b on the side of the frame connecting portion 10a, the weight of the edge 10 becomes more than necessary. It was an appropriate value in consideration of not making it heavy and making it thick enough to exert the effect of suppressing edge vibration.

FIGS. 4 to 6 show sectional shapes of the edge 10 in the second to fourth embodiments of the present invention. In the embodiment shown in FIG. 4, the semicircular section 10b is thicker on the diaphragm joining section 10c side than on the frame joining section 10a side. Joint 1
The cross-sectional shape of the front side portion (portion F in the figure) of the portion continuous to 0c is a curved shape that is gently curved. In this embodiment, the weight of the edge 10 can be reduced by an amount corresponding to the curved shape (the amount cut off from the front) as compared with the shape of FIG. This weight reduction has the advantage that the sensitivity can be improved.

In the embodiment of FIG. 5, the portion F in the figure is linear, and is similar to the embodiment of FIG.
In the above, the frame joint 10a side and the diaphragm joint 1
In the embodiment of FIG. 2, the step caused by the difference in thickness from the side 0c is shown on the front side, whereas in the embodiment of FIG. 5, the step is on the inner side of the speaker unit as indicated by D in the figure. Like that. That is, the step D is made invisible from the outside so as not to impair the aesthetic appearance.

In the embodiment of FIG. 6, similar considerations are made. In the embodiment of FIG. 4 in which the portion F in the figure is curved, the step is exposed outwardly. The step D is inward.

Although the edge shape has been described as various embodiments, the present invention is not limited to these, and it is needless to say that various modifications can be made within the scope of the gist.

[0017]

As described above, in the loudspeaker of the present invention, the thickness of the edge is increased on the side of the diaphragm joining portion in the substantially semicircular section, and the edge of the loudspeaker is joined to the substantially semicircular section and the diaphragm joining portion. Is to prevent the so-called mid-range valley from occurring on the sound pressure frequency characteristics by making the cross-sectional shape of the speaker front side continuous in a straight line or a curved line, and to obtain good sound pressure frequency characteristics There is an effect that can be.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a cross-sectional shape of an edge according to the first embodiment.

FIG. 3 is an explanatory diagram of a sound pressure frequency characteristic of the speaker according to the embodiment.

FIG. 4 is an explanatory diagram of a cross-sectional shape of an edge according to the second embodiment.

FIG. 5 is an explanatory diagram of a cross-sectional shape of an edge according to a third embodiment.

FIG. 6 is an explanatory diagram of a cross-sectional shape of an edge according to a fourth embodiment.

FIG. 7 is an explanatory diagram of a structure of a conventional speaker.

FIG. 8 is an explanatory diagram of a cross-sectional shape of an edge of a conventional speaker.

FIG. 9 is an explanatory diagram of a sound pressure frequency characteristic of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 2 Magnet 3 Voice coil 4 Damper 5 Diaphragm 7 Frame 10 Edge 10a Frame joint 10b Semicircular section 10c Diaphragm joint

Claims (1)

(57) [Claims] 1. A diaphragm Ri edge that is supported by the frame <br/> frame and junction and the substantially semicircular section portion formed <br/> from the diaphragm joining portion, said substantially semicircular section portion The first thickness on the diaphragm joint side with respect to the substantially central portion is larger than the first thickness with respect to the substantially central portion.
2 steps so as to be thicker than the second thickness at the arm joint side
And the first thickness is the second thickness
1.5 to 3 times that of the speaker, and the substantially semicircular cross section and the diaphragm joint are formed so that the cross section of the speaker front side is continuous in a straight line or a curved line. A speaker characterized by the above-mentioned.