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JPH01252099

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DESCRIPTION JPH01252099
[0001]
A. Industrial Application Field The present invention relates to a loudspeaker, and is particularly
suitable for application to a full range dynamic loudspeaker adapted to reproduce a wide
frequency band. SUMMARY OF THE INVENTION The present invention improves the frequency
characteristics by preventing deterioration of sound quality and directivity characteristics by
increasing the Young's modulus only at the end of the diaphragm using members of different
materials in the speaker. can do. C. Prior Art Conventionally, in this type of full-range type
speaker, various diaphragms are used so as to be able to reproduce up to the high range. That is,
as shown in FIG. 3, in the speaker l, the half apex angle θ of the diaphragm 3 with respect to the
diaphragm 3 fixed to the flange (not shown) via the air 2 so as to vibrate freely. The stiffness S h
(N / m) can be expressed by the following equation, where t (m) and E (N / m) are the thickness
and Young's modulus of the diaphragm 3 and the ffi of the entire diaphragm 3 can be expressed.
Assuming that mc (kg) and the mass of the voice coil are mv (kg), the high-pitched resonance
frequency can be represented by the value fh represented by the following equation (2) If the
paper diaphragm 3 is used, impregnate a lacquer or the like in the end portion 3A of the
diaphragm 3 or increase the forming pressure of the portion to increase the Young's modulus E
of the end portion 3A You can play up to the high It is possible to improve the characteristics.
Although the problem to be solved by the invention D is such, even if the Young's modulus E is
thus increased, the Young's modulus E can actually be increased by only about 2 to 3 times.
There were still insufficient problems. As one method for solving this problem, there is a method
of reproducing up to the high range by increasing the depth I 4 of the diaphragm 3. However, if
the depth H is increased, the directivity characteristic is deteriorated in the high-pitched sound
area, and there is a problem that the balance of the sound volume is broken in the entire
frequency band depending on the listening position and the sound quality is deteriorated. On the
other hand, there is a method of reducing the half apex angle θ by forming the diaphragm 3 so
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that the cross section becomes a curved surface instead of increasing the depth H of the
diaphragm 3. In this way, according to equation (1), the stiffness sh can be set to a large value,
and the height range can be reproduced. However, in this case, the tip end portion of the
diaphragm 3 becomes close to a flat plate (the diaphragm 3 vibrates in the opposite phase with
respect to the edge 2 at a predetermined frequency).
As a result, a large valley is generated in the frequency characteristic, and the sound quality is
degraded accordingly. On the other hand, a method of using, for example, mica cone having a
large Young's modulus E, a carbon fiber cone impregnated with epoxy, or the like as the
diaphragm 3 is also conceivable. However, if this is done, the mass of the entire diaphragm 3
increases significantly, and there is bending during which the sound pressure level decreases.
The present invention has been made in consideration of the above points, and an object of the
present invention is to propose a speaker capable of improving frequency characteristics by
preventing deterioration of sound quality and directivity characteristics in advance. E Means for
Solving the Problem In order to solve the problem, in the present invention, the Young's modulus
is larger than the first diaphragm member 8 and the first diaphragm member 8, and the effective
diameter is T! And a second diaphragm member 9 having a small size, and the first and second
diaphragm members 8 and 9 are used to form the diaphragm 6. The F action diaphragm 6 is
formed using the first diaphragm member 8 and the second diaphragm member 9 having a
larger Young's modulus and a smaller effective diameter T2 than the first diaphragm member 8
If so, it is possible to set the stiffness Sh to a large value only for the end portion of the
diaphragm 6. Therefore, it is possible to prevent the deterioration of the sound quality and the
directional characteristics and to improve the frequency characteristics accordingly. G.
Embodiment An embodiment of the present invention will be described in detail with reference to
the drawings. In FIG. 1, reference numeral 5 denotes a speaker as a whole, and the diaphragm 6
is fixed to the flange 7 via the edge 2. The diaphragm 6 has a first diaphragm member 8 having
an effective diameter T of 96 (mm) and a diameter 39.5 (mm) smaller than the first diaphragm
member 8 at an effective diameter T2 and an inner diameter. T is composed of the second
diaphragm member 9 having a diameter of 21 (mm), and the end portion of the first diaphragm
member 8 and the tip portion of the second diaphragm member 9 are superposed and bonded. It
is formed by Furthermore, the first diaphragm member 8 is formed of a light-weight, high-rigid
foam mica papermaking cone, while the second diaphragm member 9 is formed by impregnating
mica with epoxy and then molding. Thus, the Young's modulus of the second diaphragm member
9 with respect to the first diaphragm member 8 is about several tens times larger. In this way, it
is possible to significantly increase the Young's modulus compared to the prior art by only the
upset portion 6A of the diaphragm 6 without causing a significant increase in the mass of the
entire diaphragm 6. Therefore, the stiffness sh can be set to a large value, and a drop in the
sound pressure level can be prevented in advance and the high tone range can be reproduced.
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Furthermore, since it is not necessary to increase the depth H of the diaphragm or to reduce the
half apex angle θ, it is possible to effectively avoid the deterioration of the sound quality and the
directivity characteristic. Further, by making only the Young's modulus of the stagnant portion
6A of the diaphragm 6 significantly larger than that of the conventional case, the divided
vibration of the diaphragm 6 can be reduced, and the sound quality can be improved accordingly.
As shown in FIG. 2, as shown in FIG. 2, the front of the speaker (represented by φ = 0 °) and the
position shifted by 30 ° from the front (φ = 30 ′ ′) are shown at a position 1 m away from
the speaker When the sound pressure level was measured at a position shifted by 60 ° from the
front (represented by φ = 60 °), it was confirmed that the deterioration of the directivity
characteristics could be prevented in advance and the high tone range could be reproduced. In
this case, when a diaphragm having substantially the same shape as the diaphragm 6 is formed
only by the foam mica paper cone, the portion where the sound pressure level decreases near the
frequency 10000 (fiz) is as far as the frequency 18000 Cl1z) according to this configuration. I
was able to lift it. Furthermore, in this embodiment, the effective diameter Tz (diameter 39.5
(am)) of the second diaphragm member 9 is set to the effective diameter T of the eleventh
diaphragm member 8 (diameter 96 (mm)). By setting it to a value of about 40%, a sound pressure
level having a flat frequency characteristic can be obtained, and deterioration of sound quality
can be prevented in advance. According to the above configuration, by bonding the two members
8 and 9 having different Young's modulus and effective diameter to form the diaphragm 6,
vibration is caused without causing a significant increase in mass of the entire diaphragm. The
Young's modulus of the plate 6 can be made significantly larger than that of the conventional
one, and the frequency characteristics can be improved by preventing the deterioration of the
sound quality and the directivity characteristic in advance. In the above-described embodiment,
the first diaphragm member 8 formed of foam mica papermaking cone and the second
diaphragm member 9 formed by impregnating mica with epoxy and then molding are used.
Although the case where the diaphragm 6 is formed has been described, the material of the first
and second diaphragm members 8 and 9 is not limited to this, and various materials can be
applied as needed. In this case, even if the second diaphragm member 9 is made of aluminum or
titanium, the same effect as that of the above-described embodiment can be obtained.
Furthermore, in the above-described embodiment, the case where the diaphragm 6 is formed by
overlapping and bonding the end portion of the first diaphragm member 8 and the tip portion of
the second diaphragm member 9 has been described. The bonding method of the first and
second diaphragm members 8 and 9 is not limited to this, and various methods can be applied as
needed.
For example, in this case, the entire outer peripheral surface of the second diaphragm member 9
is the first diaphragm member 8 by setting the inner diameter of the first diaphragm member 8
to the same value as the inner diameter of the second diaphragm member 9. It may be covered
by a part of the inner circumferential surface of Furthermore, in the above-described
embodiment, the case where a part of the inner peripheral surface of the first diaphragm
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member 8 and a part of the outer peripheral surface of the second diaphragm member 9 are
overlapped and bonded is described. Conversely, a part of the outer peripheral surface of the first
diaphragm member 8 and a part of the inner peripheral surface of the second diaphragm
member 9 may be overlapped and bonded. Furthermore, in the above embodiment, the effective
diameter T z (diameter 39.5 (mm)) of the second diaphragm member 9 is the effective diameter T
of the first diaphragm member 8 (diameter 96 (mm)) The case where the sound pressure level is
made to have a flat frequency characteristic by setting it to a value of about 40% with respect to
the above has been described, but the effective diameter T2 of the second diaphragm member 9
is limited to this. It is possible to obtain a sufficiently flat sound pressure practically in the range
of about 35 to 55% with respect to the effective diameter T1 of the first diaphragm member 8. As
described above, according to the present invention, by forming a diaphragm using two members
having different Young's modulus and effective diameter, vibration is caused without causing a
significant increase in mass of the entire diaphragm. The Young's modulus can be increased only
at the end of the board, thus preventing the deterioration of the sound quality and the directional
characteristics and improving the frequency characteristics.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing a speaker according to an embodiment of the present
invention, FIG. 2 is a characteristic curve diagram showing its frequency characteristics, and FIG.
3 is a cross-sectional view showing a conventional speaker.
1.5 ...... speaker, 2 ...... edge, 3.6 ...... diaphragm, 8.9 ...... diaphragm member. Loudspeaker l Figure
0-Force 3
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