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JPH04135095

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DESCRIPTION JPH04135095
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, with the advent of digital audio, it has become
essential to improve the performance of audio peripherals, and in the automotive field, further
weight reduction is strongly required. In order to meet such a demand, a composite type speaker
having a configuration in which a mid-low range speaker and a high range speaker are combined
is used.
[0003]
A conventional composite speaker will be described below with reference to the drawings. FIG. 4
is a half sectional view showing the configuration of a conventional composite speaker. In FIG. 4,
reference numeral 1 denotes a field portion of the mid-low range speaker, and the field portion 1
is composed of an upper plate 1a, a magnet 1b and a lower plate 1c having a center pole, and the
upper plate 1a and lower portion A magnetic gap 10 is formed in the gap of the center pole
portion of the plate 1c. Further, 2 is a frame, 3 is a voice coil, 4 is a damper, and 5 is a
diaphragm.
07-05-2019
1
[0004]
A tweeter 6 is provided with a tweeter pole 7 provided with a threaded portion on its inner
periphery at the bottom and a dustproof cushion 8 fixed to the bottom of the tweeter 6 and
provided on the upper portion of the center pole portion of the lower plate 1c. The tweeter pole
7 is inserted into the recessed portion, and is connected from the lower surface through the
screw provided on the inner periphery of the tweeter pole 7 with the mounting screw 9.
[0005]
However, in the configuration of the prior art, when the input signal is applied to the main
speaker and the diaphragm 5 is oscillated, the tweeter 6 is disposed in front of the diaphragm 5
Therefore, standing waves and interference waves are generated, and the sound pressure in the
midrange increases as in the frequency characteristics shown by the solid line in FIG. 2, and the
balance of the frequency characteristics worsens and the sound quality deteriorates. there were.
[0006]
In addition, because the tweeter 6, tweeter pole 7, and dustproof cushion 8 are combined, not
only the size of the speaker is increased, but also the number of parts is large, which makes it
difficult to produce.
[0007]
The present invention solves the above-mentioned conventional problems, eliminates the
generation of standing waves and interference waves, flattens frequency characteristics, achieves
excellent sound reproduction, and is a composite which is small and has a reduced number of
parts. It is an object of the present invention to provide a type speaker.
[0008]
SUMMARY OF THE INVENTION In order to solve the problem, the composite type speaker of the
present invention is characterized in that the primary resonance of the piezoelectric vibrator is
applied to the upper end of the voice coil fitted in the magnetic gap of the main speaker. The part
to be the node of is joined, and the diaphragm for the sub speaker is joined to the upper surface
of this piezoelectric vibrator.
[0009]
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2
[Function] With this configuration, it is possible to eliminate the tweeter which is an interferer on
the front surface of the diaphragm of the main speaker, to prevent the generation of the standing
wave and the interference wave, and to achieve sufficient performance as a composite speaker. I
can be satisfied.
Further, the number of parts can be significantly reduced, and the size can be reduced to improve
productivity.
[0010]
Embodiment 1 An embodiment of the present invention will be described with reference to the
drawings.
The same reference numerals are given to parts having the same configuration as the parts
described in the above-described conventional example.
[0011]
FIG. 1 is a half sectional view showing the structure of a composite type speaker according to the
present invention. In FIG. 1, reference numeral 11 denotes a disk-shaped piezoelectric vibrator
having electrodes on both surfaces, and 12 is formed in a dome shape. 7 shows a tweeter
diaphragm which is a secondary speaker.
[0012]
In the composite type loudspeaker according to the present invention, the frame 2 is coupled to
the field portion 1 having the magnetic gap 10 formed by coupling the upper plate 1a, the
magnet 1b and the lower plate 1c, and the voice coil 3 is coupled to the central portion. The
outer edge of the diaphragm 5 is coupled to the outer edge of the frame 2 and the voice coil 3 is
fitted into the magnetic gap 10, and the damper 4 is coupled to form a main speaker. A portion
serving as a node at the time of primary resonance of the piezoelectric vibrator 11 is coupled,
and the tweeter diaphragm 12 constituting the sub-speaker is coupled to the upper surface of the
piezoelectric vibrator 11 as described above. Hereinafter, the operation of the composite speaker
according to the present invention, which is constructed in accordance with the present
invention, will be described.
07-05-2019
3
[0013]
First, an external input signal is applied to the voice coil 3 and driven according to Fleming's lefthand rule, and the voice coil 3, the damper 4 and the diaphragm 5 perform amplitudes, thereby
serving as a main speaker woofer. Play.
On the other hand, on the tweeter side, an input signal input to the voice coil 3 is applied to the
piezoelectric vibrator 11 via the voice coil 3, and this piezoelectric vibrator 11 is a voice at a
point where it becomes a node at the first resonance. The piezoelectric vibrator 11 is bent up and
down when it reaches a certain frequency, and this energy is transmitted to the tweeter
diaphragm 12 to play a role as a tweeter which is a secondary speaker.
With such a configuration, it is possible to provide a composite speaker that can handle from the
low tone range to the high tone range.
[0014]
As described above, in the composite type loudspeaker according to this embodiment, the
piezoelectric vibrator 11 is coupled to the upper end of the voice coil 3 constituting the woofer,
and the diaphragm 12 for the tweeter is further formed on the upper surface of the piezoelectric
vibrator 11. By combining, excellent sound reproduction can be performed without being
affected by standing waves and interference waves, and as in the frequency characteristics
shown by the broken lines in FIG. This makes it possible to perform excellent sound
reproduction.
In addition, not only can miniaturization be achieved by the configuration in which nothing is
arranged on the front surface of the diaphragm 5 of the main speaker, but also the number of
parts can be reduced and simplification of the production process can be realized. .
[0015]
Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with
reference to the drawings.
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4
[0016]
FIG. 3 is a cross-sectional view showing the structure of a composite type loudspeaker according
to a second embodiment of the present invention. In FIG. 3, reference numeral 21 denotes a ring
for positioning the outer peripheral portion of the piezoelectric vibrator 11; It is coupled to the
coupling portion of the coil 3 and the diaphragm 5, and a protrusion is provided on the
horizontal portion, and a portion which becomes a node at the time of the first resonance of the
piezoelectric vibrator 11 is coupled to this protrusion Is different from the configuration of the
first embodiment shown in FIG. 1 described above in that a ring 21 is provided for positioning
the outer peripheral portion of the piezoelectric vibrator 11. Since the configuration other than
the above is the same as that of the first embodiment, the description will be omitted.
[0017]
The operation of the composite type loudspeaker according to the second embodiment
configured as described above will be described below.
[0018]
First, an external input signal is applied to the voice coil 3 and driven according to Fleming's lefthand rule, and the voice coil 3, the damper 4 and the diaphragm 5 perform amplitude and play a
role as a woofer.
On the other hand, on the tweeter side, an input signal input to the voice coil 3 is applied to the
piezoelectric vibrator 11 via the voice coil 3. The piezoelectric vibrator 11 is piezoelectric at a
point where it becomes a node at the first resonance. The piezoelectric vibrator 11 is connected
to a projection provided on the horizontal portion of the positioning ring 21 for the outer
peripheral portion of the vibrator 11, and when reaching a certain frequency, the piezoelectric
vibrator 11 bends up and down, and this energy is It is transmitted to the diaphragm 12 to play a
role as a tweeter.
In addition, the weight of the ring 21 for positioning the outer peripheral portion of the
piezoelectric vibrator 11 is adjusted, for example, to increase the drop of the middle to high
range of the reproduction frequency characteristic by increasing the weight, or to flatten by
reducing the weight. The frequency characteristics of can be intentionally controlled.
07-05-2019
5
[0019]
As described above, the ring 21 for positioning the outer peripheral portion of the piezoelectric
vibrator 11 is coupled to the coupling portion of the voice coil 3 and the diaphragm 5, and the
piezoelectric vibrator 11 and the diaphragm 12 for tweeter are formed on the upper surface
thereof. By coupling, the piezoelectric vibrator 11 can be coupled with high accuracy, and the
frequency characteristics of the composite speaker can be controlled.
[0020]
In the first and second embodiments, the shape of the tweeter diaphragm 12 is a dome shape,
but it may be a conical shape.
[0021]
As described above, in the composite speaker according to the present invention, the
piezoelectric vibrator is coupled to the upper end of the voice coil of the woofer which is the
main speaker, and for the tweeter which is the sub speaker on the upper surface of the
piezoelectric vibrator. By combining the diaphragms of this configuration, nothing is arranged on
the front surface of the woofer's diaphragm, excellent sound reproduction can be performed
without being affected by the standing wave and the interference wave, and the frequency
characteristic is flattened. It is possible to
[0022]
Further, since nothing is disposed on the front surface of the diaphragm, it is possible to realize
an excellent composite type speaker which can be downsized and reduced in the number of parts
and which can be easily manufactured.
[0023]
Brief description of the drawings
[0024]
1 is a half sectional view showing the structure of a composite speaker according to a first
embodiment of the present invention
[0025]
Fig. 2 Output sound pressure frequency characteristics of composite speakers according to the
first embodiment, the second embodiment and the prior art of the present invention
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[0026]
Fig. 3 A half sectional view showing the structure of a composite type loudspeaker according to a
second embodiment of the present invention
[0027]
Fig. 4 A half sectional view showing the structure of the conventional composite type speaker
[0028]
Explanation of sign
[0029]
Reference Signs List 1 field part 1a upper plate 1b magnet 1c lower plate 2 frame 3 voice coil 4
damper 5 diaphragm 10 magnetic gap 11 piezoelectric vibrator 12 diaphragm for tweeter
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