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DESCRIPTION JPH09327088

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DESCRIPTION JPH09327088
[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 In recent years, as digital signal processing technology has
dramatically advanced and the quality of electrical signals supplied to speakers has greatly
improved, it is strongly desired to develop a speaker capable of high-quality sound reproduction
correspondingly. It is rare.
[0003]
A conventional speaker will be described with reference to FIGS. 6 and 7.
FIG. 6 is a plan view of the conventional speaker, and FIG. 7 is a side sectional view of the same.
In the figure, 1 is a bottom plate provided with a center pole, 2 is a ring-shaped magnet fixed to
the bottom plate 1, and 3 is a top plate fixed to the upper surface of the magnet 2. A frame 4 is
connected to a magnetic circuit A formed by the bottom plate 1, the ring-shaped magnet 2 and
the top plate 3. 5 is a voice coil held in the magnetic gap formed by the inner periphery of the
top plate 3 and the outer peripheral surface of the center pole of the bottom plate 1; 6 is a
damper fixed to the voice coil 5; 7 is a voice coil It is a diaphragm fixed to the tip of 5. 8 is an
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edge connected to the outer peripheral portion of the diaphragm 7, 9 is an edge bonding portion
of the edge 8, and 10 is a bonding on the frame side with the edge 8 provided on the step
portion 4a of the peripheral portion of the frame 4 It is a mating surface. Reference numeral 11
denotes a dust cap attached to the central upper surface of the diaphragm 7.
[0004]
The operation of the conventional speaker configured as described above will be described
below. First, when an electrical signal is applied to the voice coil 5 of the speaker, a driving force
is generated in the magnetic circuit A. This driving force is transmitted to the voice coil 5,
vibrates the diaphragm 7 fixed to the tip thereof, and emits a sound corresponding to the
vibration. The area of the edge 8 is increased appropriately so that the amount of amplitude
during this vibration can be gained, and conversely, the area of the edge bonding portion 9 is
made as small as possible to withstand the amplitude, and the bonding surface on the frame side
of the step 4a It adhered to 10 and maintained maintenance and reliability of performance.
[0005]
However, in the above-described conventional configuration, the edge connected to the
diaphragm 7 of the speaker in order to obtain the amplitude amount and the output sound
pressure level in the limited space and the aperture size of the speaker The area of the edge
bonding portion 9 is reduced as much as possible and fixed to the bonding surface 10 on the
frame side of the peripheral portion of the frame 4 as much as possible. For this reason, peeling
of the edge bonding portion 9 and breakage of the edge 8 are caused, and the input resistance
has to be lowered. Furthermore, in order to obtain an amplitude amount, the area of the edge
bonding portion 9 can not be made so small to prevent a decrease in input resistance, and the
amplitude area of the edge 8 needs to be increased. As a result, the size of the diaphragm 7 can
not but be reduced, and the output sound pressure level also decreases in terms of performance,
making it extremely difficult to ensure the performance at high input and maintain the reliability.
[0006]
The present invention solves the above-mentioned conventional problems and can maintain a
structure capable of withstanding high input and a high output sound pressure level even in a
limited space and aperture size of a speaker, and realizes low distortion and high linearity
performance. It is an object of the present invention to provide a speaker with excellent acoustic
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characteristics that can be achieved.
[0007]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the
loudspeaker according to the present invention comprises at least a frame coupled to a magnetic
circuit, and a diaphragm having an inner periphery coupled to a voice coil and an outer
periphery coupled to an edge. It is bonded to the rising portion of the frame along the edge, and
it is possible to secure a large amount of amplitude of the edge and to provide a speaker having
excellent acoustic characteristics that can withstand high input. is there.
[0008]
According to a first aspect of the present invention, there is provided a frame coupled to at least
a magnetic circuit, a diaphragm having an inner periphery coupled to a voice coil and an outer
periphery coupled to an edge, and The present invention provides a speaker having excellent
acoustic characteristics by adhering to the rising portion along the edge to improve the adhesive
strength and securing a large amount of amplitude of the edge.
[0009]
The invention according to claim 2 includes a frame coupled to at least a magnetic circuit, a
diaphragm having an inner periphery coupled to a voice coil and an outer periphery coupled to
an edge, and bonding of the edge and the frame in a vertical direction It is performed in two
directions in the horizontal direction, and the bonding surface in the vertical direction is made to
be equal to or larger than the bonding surface in the horizontal direction, ensuring a large
amount of edge amplitude and increasing the bonding area between the edge and the frame , To
improve the adhesive strength.
[0010]
According to a third aspect of the present invention, the bonding surface of the edge and the
frame of the speaker according to the second aspect comprises the vertical bonding portion and
the horizontal guide portion, and the bonding of the edge and the frame by bonding is strong
Thus, the degree of freedom in selecting the material of the edge is expanded, and it is possible to
adopt a low cost material, and also the positioning of the bonding to the frame of the edge can be
easily performed.
[0011]
The invention according to the fourth aspect is that the reinforcing ring is provided so as to
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overlap the edge according to the first aspect, and adhesion between the edge and the frame is
prevented from being dislocated by the reinforcing ring.
[0012]
An embodiment of a speaker according to the present invention will be described below with
reference to FIGS.
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0013]
(First Embodiment) FIG. 1 is a plan view of a speaker according to an embodiment of the present
invention, and FIG. 2 is a side sectional view of the same.
The difference between the present invention and the prior art will be described with reference
to the same drawing. 4b is a rising portion provided on the outer periphery of the frame 4 and
provided in a direction substantially perpendicular to the vibration direction of the diaphragm 7.
The vertically bonded surface 12 of the edge 8a is bonded along the 4b.
[0014]
In the present embodiment, the horizontal bonding surface 13 of the edge 8 a is bonded to the
step 4 a of the frame 4 in the horizontal direction substantially parallel to the vibration direction
of the diaphragm 7. The bonding area of the surface 13 is made equal to or less than the area of
the vertical bonding surface 12.
[0015]
In the present embodiment, since the vertical bonding surface 12 of the edge 8a is bonded along
the rising portion 4b of the frame 4, the size of the diaphragm 7 is not affected (it can be made
larger), The adhesive of the frame 4 and the edge 8a can be firmly adhered, and the amplitude
amount can be sufficiently ensured by the edge 8a, and a speaker with high input resistance
having excellent acoustic characteristics can be provided. is there.
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[0016]
In the present embodiment, the horizontal bonding surface 13 of the edge 8a is further bonded
by the adhesive at the step 4a, so that the frame 4 and the edge 8a can be fixed more firmly.
[0017]
FIG. 3 shows the conventional loudspeaker and the high-frequency frequency characteristic and
the second harmonic distortion characteristic of the present embodiment, but the loudspeaker
according to the present embodiment has the sound pressure frequency characteristic 18 of the
conventional loudspeaker over the entire band. It can be seen that a relatively high sound
pressure frequency characteristic 17 is shown.
Also, it shows low-range reproduction with extension also in the low-pitch range of the sound
pressure frequency characteristic.
Further, it can be confirmed that the present embodiment (19) realizes low distortion and high
linearity as compared with the second harmonic distortion characteristic (conventional one 20).
[0018]
Second Embodiment Another embodiment of the speaker according to the present invention will
be described with reference to the side sectional view of FIG.
[0019]
The difference between the present embodiment and the prior art will be described with
reference to the same figure. A substantially vertical vertically bonded portion 14 along the
rising portion 4b of the frame 4 where the edge 8b is branched and a fold of the end of the frame
4 It forms from the horizontal direction guide part 15 of the substantially horizontal direction in
alignment with the bending part 4c, and apply | coats the adhesive agent (edge guide adhesive
agent) 16 to the branch part.
[0020]
As described above, the configuration of the edge 8b is divided into the vertical direction bonding
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portion 14 and the frame bonding horizontal direction guide portion 15 as described above, so
that the edge bonding portion 9 has a self-holding force such as cloth. The edge 8b is fixed to the
rising surface of the frame 4 by the edge and guide portion adhesive 16 that fixes the frame
bonding horizontal direction guide portion 15 and the edge and guide portion adhesive 16 that
fixes it to the edge 8b The material of any edge 8b can be selected freely regardless of the shape,
and a material with excellent cost performance such as cloth can be adopted for the edge 8b, and
the edge 8b to the frame 4 Positioning at the time of fixation is also very easy.
[0021]
Third Embodiment Another embodiment of the speaker according to the present invention will
be described with reference to the side sectional view of FIG.
[0022]
The difference between the present embodiment and the prior art will be described with
reference to the figure. While providing the edge 8c with a substantially vertical vertical bonding
portion 15 along the rising portion 4b of the frame 4, bonding of the edge 8c in the vertical
direction is also possible. The reinforcing ring 17 is attached to the portion 15 so as to overlap
with the portion 15, and the bonding (adhesion) of the frame 4 and the edge 8 c is prevented
from being shifted.
[0023]
The reinforcing ring 17 strengthens the connection between the edge 8c and the frame 4 and
widens the selection range of the material of the edge 8c as in the second embodiment.
[0024]
Even when the reinforcing ring 17 is used as in the above embodiment, the reinforcing ring 17 is
superimposed on the vertical direction bonding portion 15 of the edge 8c, so that the frame 4 of
the prior art shown in FIG. As shown in FIG. 5 from the edge fixing portion B, since the edge 8c
and the reinforcing ring 17 are coupled to the frame 4 at the edge fixing portion A having a very
small width, the effective vibration diameter of the speaker having a frame with the same outer
diameter as the conventional Since the size can be increased, a small, high-performance speaker
can be realized.
[0025]
In each of the above-described embodiments, a speaker having a circular plan view has been
described, but the same effect can be obtained with a speaker such as an oval.
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[0026]
As described above, according to the present invention, since the edge is pasted along the rising
portion of the frame, a large amount of edge amplitude can be secured without any restriction on
the diaphragm, which is high. Thus, it is possible to realize a speaker having excellent acoustic
characteristics with low distortion and high linearity performance, which realizes the structure
capable of withstanding the input and the high output sound pressure level.
[0027]
Brief description of the drawings
[0028]
1 is a plan view of the speaker according to the embodiment of the present invention.
[0029]
Fig. 2 Same side sectional view
[0030]
Fig. 3 Characteristic diagram of same sound pressure frequency characteristic and second
harmonic distortion characteristic
[0031]
4 is a side sectional view of a speaker according to another embodiment of the present invention
[0032]
5 is a side sectional view of a speaker according to another embodiment of the present invention
[0033]
Fig. 6 A plan view of the conventional speaker
[0034]
Fig. 7 Same side sectional view
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[0035]
Explanation of sign
[0036]
REFERENCE SIGNS LIST 4 frame 4 a step portion 4 b rising portion 7 diaphragm 8 a, 8 b, 8 c
edge 12 vertical bonding surface 13 horizontal bonding surface 14 vertical bonding portion 15
horizontal guide portion 16 edge guide adhesive 17 reinforcing ring A magnetic circuit
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