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JPH11262080

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DESCRIPTION JPH11262080
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art A conventional loudspeaker will be described with reference to a
half sectional view of FIG.
[0003]
According to the figure, 1 is a lower plate with a pole piece, and a magnet 3 is disposed between
it and the upper plate 2, and a uniform gap is formed between the pole piece of the lower plate 1
with the pole piece and the upper plate 2 The magnetic gap 4 is provided.
[0004]
The frame 5 is joined to the upper plate 2, the damper 6 and the diaphragm 7 are joined to the
frame 5, and these parts are joined to the voice coil 8 so that the wire ring 9 of the voice coil 8 is
in the magnetic gap 4 It supports not to touch.
[0005]
In the vicinity of the center of the diaphragm 7, a dust cap 10 is provided to prevent dust from
entering the magnetic gap 4.
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1
[0006]
Next, regarding the operation of this speaker, when an electric signal is input to the wire ring 9
of the voice coil 8, the voice coil 8 moves by receiving a force from the magnetic gap 4, and this
force is joined to the voice coil 8 The diaphragm 7 is moved, and the diaphragm 7 generates a
sound in front of the speaker.
[0007]
Here, as shown in FIG. 4, the diaphragm 7 has a single radius (R) or a plurality of (combined)
combined radiuses (R) from the junction with the voice coil 8 to the edge bonding part on the
outer periphery. It has a curved surface shape.
[0008]
However, in order to improve the expansion of the high region for widening the frequency
characteristics of the speaker, it is necessary to reduce the apex angle A of the central portion of
the diaphragm 7 as shown in FIG. In order to improve the response in the low frequency region
and alleviate the disturbance of the frequency characteristics in the low frequency region, it is
necessary to have the shape rigidity of the diaphragm 7 and the appropriate flexibility, and for
that purpose, one scale It is desirable to increase the contact angle B of the outer peripheral
portion of the diaphragm 7 with the edge of the edge bonding portion.
[0009]
However, if the curved surface shape is constituted by a single R as shown in FIG. 4, the apex
angle A of the junction with the voice coil 8 is reduced and the contact angle B with the edge
pasting portion on the outer periphery is increased. It can not be shaped to be compatible, and is
not suitable for a speaker diaphragm that performs wide-range reproduction.
Therefore, by making the curved surface shape a combined R shape shown in FIG. 5, the shape is
realized such that the apex angle Aa of the junction with the voice coil 8 is reduced and the
contact angle Bb with the edge bonding portion on the outer periphery is increased. However,
the point of contact between Ra and Rb becomes a bending point and the strength of the
diaphragm 7 becomes weak, and as shown in the frequency characteristic diagram of FIG. Has a
problem in that the disturbance (peak-dip) is likely to occur.
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2
[0010]
The present invention solves the above problems, and realizes a shape that reduces the apex
angle of the joint portion with the voice coil and increases the contact angle of the edge bonding
portion on the outer periphery of the diaphragm, and It is an object of the present invention to
provide a speaker having an excellent sound quality in which the responsiveness is improved, the
amount of disturbance (peak-dip) of the middle to high frequency characteristic is reduced, and
the high frequency reproduction frequency band is improved.
[0011]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the speaker of
the present invention has a plurality of radiuses of a curved surface from at least a junction with
a voice coil to an edge pasting portion on the outer periphery, A diaphragm formed so that the
intersection of this radius does not become an inflection point, and it is a curved surface shape
having a plurality of radiuses, and has no inflection point and is thus joined to a voice coil
Achieves a shape that reduces the apex angle of the part and increases the contact angle of the
edge bonding part on the outer periphery, and improves the responsiveness of the low band, and
the amount of disturbance (peak dip) of the mid to high band frequency characteristics It is
possible to provide an excellent speaker with reduced sound quality and improved high
frequency reproduction frequency band.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim
1 of the present invention is characterized in that it has a plurality of radii at least from the
junction with the voice coil to the edge pasting at the outer periphery, and the intersection of
these radii The diaphragm is formed such that the portion does not become an inflection point,
and the curved surface of the diaphragm is a curved surface shape having a plurality of radiuses
but has no inflection point and is thus joined to the voice coil By realizing a shape that reduces
the apex angle of the part and increases the contact angle of the edge bonding part on the outer
periphery, distortion due to resonance dispersion is reduced, and a speaker with excellent sound
quality with an improved high frequency reproduction frequency band is provided. It is
[0013]
According to a second aspect of the present invention, the diaphragm curved surface of the
speaker of the first aspect is formed by a part of an oval, distortion due to resonance dispersion
is reduced, and the high frequency reproduction frequency band is improved. It is possible to
easily provide a diaphragm suitable for the above and realize an excellent speaker.
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3
[0014]
Hereinafter, an embodiment of a speaker according to the present invention will be described
with reference to FIGS. 1 (a) and 1 (b) and FIG.
In addition, since the structure itself of a speaker is the same as that of a prior art, description is
abbreviate | omitted and demonstrated.
[0015]
FIG. 1 (a) shows a half sectional view of a diaphragm which is an essential part of an embodiment
of the speaker according to the present invention, and FIG. 1 (b) shows the relationship between
the diaphragm and an edge and a voice coil. It is a half section view for explaining.
[0016]
In the figure, reference numeral 7a is a diaphragm, and reference numeral 11 is an edge coupled
to the outer periphery of the diaphragm 7a via an edge bonding portion.
The diaphragm 7a has a curved surface, which is a part of a regular elliptical shape having a
major axis and a minor axis, and has a smooth shape having no bending point.
[0017]
Next, the comparison result of the more specific speaker of the said Embodiment 1 and a
comparative example is shown in (Table 1).
[0018]
Comparative Example A is a speaker using a diaphragm having the diaphragm shape of FIG. 4,
and Comparative Example B is a speaker using a diaphragm having the diaphragm shape of FIG.
5.
[0020]
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4
As apparent from (Table 1), in the loudspeaker of the present embodiment, the disturbance of the
frequency characteristic is reduced centering on the middle and high frequencies than in
Comparative Examples A and B, and the high frequency reproduction frequency band is
improved. confirmed.
[0021]
FIG. 2 is a frequency sound pressure characteristic diagram of the present embodiment.
Further, in the first embodiment, the curved surface shape of the diaphragm is formed by a
regular ellipse, but the apex angle AA of the joint portion with the voice coil is made small and
the contact angle BB of the edge bonding portion of the outer periphery is made large. And as
long as it has an inflection point, it may be appropriately selected from among those belonging to
an oval.
[0022]
As described above, the loudspeaker according to the present invention uses the diaphragm in
which the curved surface shape from the junction with the voice coil to the edge bonding portion
on the outer periphery is a part of an oval. A vertex angle of the junction with the voice coil is
made small without having a bending point, and a shape that increases the contact angle of the
edge bonding portion on the outer periphery is realized, and the disturbance of frequency
characteristics is reduced by resonance dispersion. And a speaker with excellent sound quality
with an improved high frequency reproduction frequency band.
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