JPH1118196

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DESCRIPTION JPH1118196
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of high-frequency attenuation characteristics of a cone-type speaker used for
sound reproduction equipment and the like.
[0002]
2. Description of the Related Art A conventional cone type loudspeaker will be described below
with reference to the drawings. FIG. 5 is a cross-sectional view showing the configuration of a
conventional general cone-type speaker. When an audio signal is applied to the speaker and a
current flows through the voice coil wire ring 51, the voice coil wire ring 51 vibrates due to the
current and the magnetic field generated in the magnetic gap. This vibration is transmitted to the
voice coil bobbin 52 and further to the diaphragm 53 and the center cap 54, and this vibration
becomes a sound wave and is reproduced as a sound. At this time, a specific deformation mode is
generated in the diaphragm depending on the material and shape of the diaphragm, and a highfrequency resonance peak on the sound pressure frequency characteristic is obtained. This high
frequency resonance peak is reproduced as a very offensive sound in terms of hearing.
[0003]
In order to solve such a subject, an example of the speaker provided with the favorable high
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region attenuation characteristic is disclosed by Japanese Utility Model Publication No. 61107297. That is, a vibration system is provided that includes a cone-shaped diaphragm, a voice
coil is fixed to the lower end of the inner periphery of the diaphragm, a damper is bonded to the
voice coil, and an edge is bonded to the outer periphery of the diaphragm. In the speaker having
a cone shape, the outer peripheral portion of the diaphragm is circular, and the contour line
shape smoothly transitions to an elliptical shape as the inner peripheral portion is approached,
and a semitop of the bonding portion with the voice coil in the inner peripheral portion The
angle shows a minimum value in the major axis direction of the contour line of the elliptical
shape and a maximum value in the minor axis direction while continuously changing in the
circumferential direction of the voice coil.
[0004]
SUMMARY OF THE INVENTION In such a conventional cone-type speaker, since the shape of the
diaphragm is complicated, the mold shape for producing the diaphragm is also complicated, and
the mold is produced. Required a high-precision processing machine such as an NC lathe and a
considerable amount of time, which was expensive.
[0005]
The sound pressure frequency characteristics of the speaker can be improved by the means
disclosed in Japanese Utility Model Publication No. 61-104698. This means is effective for
eliminating high frequency resonance peaks around 4 KHz and 8 KHz. .
Also, when playing music using this speaker, it is necessary to combine it with a high-tone
playback speaker to compensate for the high range that is lacking only with this speaker.
However, the high frequency attenuation characteristic is the same as the conventional one, and
in order to flatten the general characteristic with the high-tone reproduction dedicated speaker,
the high frequency characteristic must be sharply attenuated electrically using a network or the
like.
[0006]
The present invention solves the above-mentioned problems, and provides a cone-shaped
speaker having a diaphragm shape that is easy to make, reducing high-frequency resonance
peaks, and sharply attenuating high-frequency characteristics. The purpose is to
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[0007]
The present invention according to claim 1 comprises a diaphragm having a stepped portion
between an inner peripheral portion and an outer peripheral portion, the outer peripheral
portion of the diaphragm being a front surface of the stepped portion. The width from the
innermost diameter to the outermost diameter of the diaphragm is Wc, the width of the step is
Wd, the depth of the diaphragm is Hc, and the height of the step is Hd. It is a cone type speaker
configured to satisfy the condition of (Wc / Wd)> 3 and (Hc / Hd)> 3.
[0008]
Thereby, the compliance of the stepped portion acts as a mechanical high cut filter, and the high
frequency characteristic can be sharply attenuated.
[0009]
According to a second aspect of the present invention, there is provided a cone-type speaker
according to the first aspect, comprising a center cap having an outer diameter shape fitted to
the step portion of the diaphragm.
[0010]
Thereby, when attaching a center cap to a diaphragm, positioning of a center cap can be
performed in a level difference part, and improvement in productivity can be realized.
[0011]
According to a third aspect of the present invention, there is provided a cone type speaker
according to the first aspect, wherein a connection portion between the voice coil lead wire and a
tinsel wire having one end coupled to a terminal is disposed on the front surface of the inner
peripheral portion of the diaphragm.
[0012]
Thus, the connection between the voice coil lead wire and the tinsel wire can be prevented from
coming out of the extended surface of the curved surface in the outer peripheral portion than the
step portion of the diaphragm and can not contact the sub cone provided on the diaphragm. .
[0013]
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DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of a
cone-shaped speaker according to the present invention will be described with reference to the
drawings.
The present embodiment relates to claim 1.
[0014]
FIG. 1 is a cross-sectional view showing a configuration of a first embodiment of a cone-type
speaker according to the present invention.
This cone type speaker has an aperture of 140 mm.
In FIG. 1, reference numeral 1 denotes a diaphragm provided with a step portion 2 and made of
100% pulp, having a thickness of 0.4 mm and an outer diameter of 95 mm.
The inner and outer circumferences of the diaphragm 1 and the step 2 are all straight, and the
step and the inner circumference, and the step and the outer circumference are respectively
connected at the corner of R5, and the connection position is φ50 mm, respectively. The outer
peripheral part protrudes in the front direction from the inner peripheral part as φ54 mm.
The width Wc of the innermost and outermost diameters of the diaphragm 1 is 34.4 mm, the
width Wd of the stepped portion is 2 mm, the diaphragm depth Hc is 28.8 mm, and the height
Hd of the stepped portion 2 is 3 It is .5 mm.
Therefore, Wc / Wd = 17.2 and Hc / Hd = 8.2.
[0015]
The outermost periphery of the diaphragm 1 is connected to an iron plate frame 4 with a
thickness of 0.7 mm by an edge 3 of an urethane foam up roll having an outer diameter of 122
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mm and a thickness of 1.6 mm.
Further, a voice coil bobbin 5 made of aluminum having a thickness of 0.05 mm is attached to
the innermost diameter portion of the diaphragm 1, and the voice coil bobbin 5 is centrally held
by a cotton cloth damper 6 whose outer peripheral portion is fixed to the frame 4. There is.
Furthermore, on the outer peripheral surface of the diaphragm 1, a center cap 7 having an outer
diameter of 60 mm, a thickness of 0.3 mm, and 100% pulp is attached. In the lower part of the
frame 4, a field magnet 8 comprising a ferrite main magnet having an outer diameter of 70 mm
and a thickness of 10 mm, a ferrite cancel magnet having an outer diameter of 60 mm and a
thickness of 9 mm, an iron top plate and a yoke is disposed. . Further, the voice coil ring portion
9 wound around the lower portion of the voice coil bobbin 5 is inserted into the magnetic gap
portion formed by the top plate and the yoke.
[0016]
The operation of the above configuration will be described. In the cone-type speaker in the
present embodiment, a discontinuous point, ie, a step 2 is present on the diaphragm 1. The
mechanical impedance changes due to the stepped portion 2 and becomes compliance. As a
result, a mechanical high cut filter is formed, and high frequency components can be attenuated.
Therefore, while being able to reduce a high region resonance peak, attenuation characteristics
can be made steep.
[0017]
In addition, when the condition of (Wc / Wd)> 3 and (Hc / Hd)> 3 is removed from the size of the
step 2 by FEM simulation and measurement experiment, the compliance of the step 2 is more
than necessary. It has been confirmed that not only can the attenuation characteristic be
obtained sufficiently, but the high frequency resonance peak may become large. In the present
embodiment, the specification satisfies the above conditions, and the improvement of the high
frequency attenuation characteristic can be realized.
[0018]
The effects will be described below with reference to measured characteristics. FIG. 2 shows by
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contrast the cone-shaped speaker of the present embodiment and the measured sound pressure
frequency characteristics of the conventional general cone-shaped speaker shown in FIG. In the
figure, in the conventional cone-type loudspeaker, high-frequency resonance peaks are confirmed
around 5 KHz and 8 KHz as indicated by the characteristic B, but in the cone-type loudspeaker of
the present embodiment, high-frequency resonance peaks are indicated as the characteristic A. It
can be confirmed that the resonance peak has been significantly reduced. Furthermore, it can be
confirmed that the high-frequency attenuation characteristics are also sharply attenuated at
around -16 dB / oct from around 5 KHz.
[0019]
In the present embodiment, although the inner peripheral part, the outer peripheral part, and the
step part 2 of the diaphragm 1 are all in a straight shape, the same effect can be obtained even if
they are all connected in a curve shape without corners. Needless to say.
[0020]
Second Embodiment A second embodiment of the cone-type speaker according to the present
invention will be described with reference to the drawings.
The present embodiment relates to claim 2.
[0021]
FIG. 3 is a cross-sectional view showing the configuration of the cone-type speaker in the present
embodiment. The present embodiment differs from the first embodiment only in the shape of the
center cap 7. That is, the center cap 7 has an outermost diameter of 54 mm, and the outer
diameter is shaped to fit into the step portion 2 of the diaphragm 1, and the outer diameter
portion of the center cap 7 fits into the step portion 2 Is configured.
[0022]
Heretofore, in order to attach the center cap 7 to the center position of the diaphragm 1, it has
been carefully done by visual observation or using a dedicated jig. Therefore, a large amount of
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time is required for the operation, and a dedicated jig has to be manufactured.
[0023]
According to the cone-type speaker of the present embodiment, when the center cap 7 is
attached to the diaphragm 1, the step portion 2 becomes a positioning portion, the workability
can be greatly improved, and a dedicated jig becomes unnecessary.
[0024]
Third Embodiment The third embodiment of the cone-shaped speaker according to the present
invention will be described with reference to the drawings.
The present embodiment relates to claim 3.
[0025]
FIG. 4 (a) is a plan view showing a configuration of a cone-type speaker in the present
embodiment, and FIG. 4 (b) is a cross-sectional view of the same. The present embodiment is
different from the first embodiment in that a sub cone 10 is provided instead of the center cap 7
and a processing portion of a voice coil lead wire is provided. The other basic configuration is the
same as that of the first embodiment.
[0026]
Conventionally, the distance between the sub cone 10 and the diaphragm 1 is not sufficient, and
the sub cone 10 and the connector 11 are in contact with each other by the vibration of the sub
cone 10 and the diaphragm 1 in order to arrange the connector 11 in that portion. As a result,
when the sub cone 10 is made of metal, a short circuit may occur.
[0027]
The above problem is solved in the present embodiment.
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That is, the outermost periphery of an aluminum subcone 10 having an outer diameter of 60 mm
and a thickness of 0.1 mm is fixed to the diaphragm 1, and its central portion is fixed and
attached to the tip of the voice coil bobbin 5. Further, the voice coil lead wire 12 drawn out from
the voice coil wire ring portion 9 is electrically connected to the tinsel wire 14 led from the
terminal 13 at the connection portion 11 on the front surface of the inner peripheral portion of
the diaphragm 1.
[0028]
According to the cone-type speaker of the present embodiment configured as described above,
the gap between the inner periphery of diaphragm 1 and subcone 10 in which connection
portion 11 is arranged is sufficiently made by step 2 of diaphragm 1 Can prevent the occurrence
of abnormal noise or short circuit due to contact.
[0029]
According to the present invention, the step portion provided on the diaphragm acts as a
mechanical high-cut filter to attenuate the high frequency characteristic, and hence the high
frequency resonance peak can be reduced. At the same time, the attenuation characteristic can
be made steep, and even when combined with the high-tone reproduction dedicated speaker,
flattening of the general characteristic can be realized without correcting the high-frequency
characteristic using a network or the like.
In addition, since the shape of the diaphragm is simple, the mold for manufacturing it can also be
a simple shape.
[0030]
According to the second aspect of the present invention, good high-frequency characteristics can
be obtained in the same manner as described above, and the center cap can be easily positioned,
so that the workability can be significantly improved.
[0031]
The present invention according to claim 3 is capable of obtaining good high-frequency
characteristics in the same manner as described above, and preventing contact between the
connection portion of the voice coil lead wire and the tinsel wire and the subcone to improve the
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quality. Can.
[0032]
Brief description of the drawings
[0033]
1 is a cross-sectional view showing the configuration of the first embodiment of the cone type
speaker according to the present invention
[0034]
Fig. 2 A characteristic diagram showing sound pressure frequency characteristics of the cone
type speaker according to the embodiment and the conventional general cone type speaker
shown in Fig. 5
[0035]
3 is a cross-sectional view showing the configuration of a second embodiment of the cone-type
speaker according to the present invention
[0036]
4 is a plan view and a cross-sectional view showing the configuration of the third embodiment of
the cone type speaker of the present invention
[0037]
5 is a cross-sectional view showing the configuration of a conventional general cone-type speaker
[0038]
Explanation of sign
[0039]
1, 53 diaphragm 2 step portion 3 edge 4 frame 5, 52 voice coil bobbin 6 damper 7, 54 center
cap 8 field portion 9, 51 voice coil wire ring portion 10 sub cone 11 connection portion 12 voice
coil lead wire 13 terminal 14 tinsel wire line
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