close

Вход

Забыли?

вход по аккаунту

?

JPH077790

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH077790
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker, and more particularly to the shape of an edge supporting a diaphragm.
[0002]
2. Description of the Related Art The general structure of a speaker unit in a speaker is briefly
shown in FIG. 7 (a). Moreover, the state which looked at the speaker unit from the front direction
is shown in FIG.7 (b). 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, and the upper end of the voice coil 3 is supported by the damper 4 and
connected to the diaphragm 5. Furthermore, the edge 6 is joined to the outer periphery of the
diaphragm 5, and the edge 6 is joined to the frame 7 so that the diaphragm 5 is supported by the
frame 7. The vibration system is configured such that the diaphragm 5 is vibrated according to
the vibration of the voice coil 3 in the magnetic circuit.
[0003]
Here, the edge 6 is formed in a ring shape as can be seen from FIG. 7B, and the diaphragm joint
portion 6c which is the inner peripheral end thereof is joined to the outer periphery of the
diaphragm 5, and the frame joint which is the outer peripheral end The portion 6 a is joined to
12-05-2019
1
the frame 7. Further, as can be seen from FIG. 7B and FIG. 8 showing the edge 6 in a sectional
view, the edge 6 is connected to the frame joint 6a and the diaphragm joint 6c by the
semicircular cross section 6b. It has a shape. The frame joint 6a, the semicircular cross section
6b, and the diaphragm joint 6c are integrally formed with substantially the same thickness.
[0004]
By the way, in the conventional speaker having such a structure, particularly 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, In (the band between 1000 and 5000 Hz), the characteristic is
degraded in the form of valleys as shown by the dashed dotted line, and there is a problem that
so-called valleys in the middle range are generated in frequency characteristics.
[0005]
SUMMARY OF THE INVENTION The present invention is intended to solve such problems and to
obtain good frequency characteristics. For this purpose, the diaphragm is interposed between the
diaphragm and the frame. As an edge to be supported by the frame, the thickness on the
diaphragm joint side is larger than the thickness on the frame joint side than the substantially
central portion, and the cross section substantially semicircular portion And a diaphragm joint
portion are provided such that the cross-sectional shape on the front side of the speaker is
formed to be continuous in a linear shape or a curved shape.
Here, the thickness of the substantially semi-circular section in cross section on the diaphragm
joint side with respect to the substantially central portion is set to 1.5 to 3 times the thickness on
the frame joint side.
[0006]
In the sound pressure frequency characteristics, the generation of valleys in the middle range is
that the resonance occurs in the opposite phase with respect to the diaphragm due to the
resonance generated in that band and the sound is canceled by the diaphragm and the edge It is
thought that it is for. Here, the edge should be thickened on the side of the joint with the
diaphragm, and the cross-sectional shape of the front side of the loudspeaker should be
continuous in a straight line or a curved line. Thus, it is possible to suppress the vibration of the
edge with respect to the diaphragm and to avoid the generation of the vibration of the opposite
12-05-2019
2
phase.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 (a) and 1 (b) show an explanatory
view and a front view of a structure of a speaker unit as a first embodiment of a speaker
according to the present invention. The structure of the speaker unit shown in FIG. 1A is
substantially the same as the structure shown in FIG. 7A. In this embodiment, the edge shape is
different from that of the prior art shown in FIGS. 7 and 8, and 10 indicates an edge in this
embodiment. It is FIG. 2 which expanded the edge 10 as sectional drawing.
[0008]
The edge 10 is formed in a ring shape as can be seen from FIG. 1B, and the outer peripheral end
thereof is a frame joint portion 10a attached to the frame 7, and the inner peripheral end is an
outer peripheral end of the diaphragm 5 (FIG. ) And the frame joint 10a and the diaphragm joint
10c are continuous by a semicircular cross section 10b having a substantially semicircular cross
section. ing.
[0009]
And, as clearly shown in FIG. 2, this edge 10 has a semicircular cross section with respect to the
thickness (Ta) on the frame joint 10a side from the central part (the top of the semicircle) of the
semicircular cross section 10b. The thickness on the side of the diaphragm joint 10c is thicker
than that of the central portion of the portion 10b by about 1.5 to 3 times.
[0010]
Furthermore, the cross-sectional shape of the front side (the portion F in the figure) of the
portion continuing from the semicircular cross-section 10b to the diaphragm joint 10c is linear,
that is, viewed from the front side The break of the boundary portion between the circular
portion 10b and the diaphragm joint portion 10c is eliminated (see FIG. 1B).
Such an edge 10 is integrally formed of, for example, a rubber-based material from the frame
joint portion 10a to the diaphragm joint portion 10c.
12-05-2019
3
[0011]
By forming the edge 10 in such a shape and fixing it to the diaphragm 5, it is possible to
suppress the vibration of the edge with respect to the diaphragm 5, thereby making it possible to
improve the sound pressure frequency characteristics.
When the frequency characteristic of the sound pressure level by the speaker corresponding to
this example was measured, the result as shown in FIG. 3 was obtained. That is, the decrease in
the sound pressure level in the band of 1000 to 5000 Hz was eliminated, that is, the valley of the
midrange could be eliminated.
[0012]
The weight of the edge 10 is not increased more than necessary by setting the thickness on the
diaphragm bonding portion 10c side to about 1.5 to 3 times the thickness on the frame bonding
portion 10a side of the cross-sectional semicircular portion 10b. And it was an appropriate value
when it was considered that it was thickened to such an extent that the suppression effect of the
edge vibration was exhibited.
[0013]
The cross-sectional shape of the edge 10 in the 2nd-4th Example of this invention is shown in
FIGS.
In the embodiment of FIG. 4, the cross-section semi-circular portion 10b is the same as that of
the side of the diaphragm joint 10c than the side of the frame joint 10a, but from the crosssection semi-circular portion 10b to the diaphragm The cross-sectional shape of the front surface
side portion (portion F in the drawing) of the portion continuous to the bonding portion 10c is a
gently curved curved shape. In this embodiment, the weight of the edge 10 can be reduced by
the amount of curvature (the amount seen from the front) compared to the shape of FIG. And,
this weight reduction brings about an advantage that the sensitivity can be improved.
[0014]
12-05-2019
4
In the embodiment of FIG. 5, the portion F in the drawing is linear, and is similar to the
embodiment of FIG. 2, but in the cross-sectional semicircular portion 10b, the frame joint portion
10a side and the diaphragm joint portion 10c side While the step caused by the difference in
thickness appears on the front side in the embodiment of FIG. 2, the step is on the inner surface
side of the speaker unit as indicated by D in the embodiment of FIG. There is. That is, the level
difference D can not be visually recognized from the outside, and the appearance is not impaired.
[0015]
In the embodiment of FIG. 6, the same consideration is made. In the embodiment of FIG. 4 in
which the portion F is curved, the step is exposed outward, while the step D is It is intended to be
inward.
[0016]
In addition, although the edge shape was demonstrated as various Examples above, this invention
is not limited to these, It can not be overemphasized that various modifications can be considered
within the range of a summary.
[0017]
As described above, in the loudspeaker according to the present invention, the thickness of the
edge is increased on the diaphragm joint side of the substantially semicircular section in cross
section, and the substantially semicircular section in cross section and the diaphragm joint By
making the cross-sectional shape on the front side of the speaker continuous in a straight line or
a curve, it is possible to prevent the generation of so-called mid-range valleys on the sound
pressure frequency characteristic and obtain a good sound pressure frequency characteristic It
has the effect of being able to
12-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
jph077790
1/--страниц
Пожаловаться на содержимое документа