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JPS5546648

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DESCRIPTION JPS5546648
Specification L Title of Invention
スピーカ
3. Detailed Description of the Invention The present invention relates to the improvement of a
loudspeaker, in particular a composite coaxial loudspeaker. The band to be reproduced by the
speaker is the human audible range, ie, a very wide range from 20 to 20 KHz. Since it is almost
impossible technically to reproduce such a wide band with one speaker, in the case of a speaker
aiming for faithful reproduction, the above-mentioned band is usually divided into several and
each band is A separate speaker is used to play. Although this is a system called 7 complex type
speaker system, the problem in this case is that the directionality of the sound and the sound
image become unclear because there are a plurality of speakers according to the reproduction
band. . As a method of solving this problem, there is a coaxial speaker system. This is a system in
which a bass speaker and a treble speaker are arranged on the same axis, and is often used
because of the good localization of the sound source. However, this method also has
disadvantages. That is, the drawback is that the sound from the high-pitched speaker is disturbed
by the low-pitched speaker. The following conventional speakers based on the drawing 1! Explain
in detail. FIG. 1 is a cross-sectional view of a conventional composite coaxial speaker in which a
bass speaker for bass reproduction having an annular diaphragm and a treble speaker for treble
reproduction using a cone-shaped diaphragm are disposed on the same axis. In the figure, 1 is a
bass speaker, 2 is a high-pitched speaker, and 3 is a cabinet. 4 is a diaphragm of a bass speaker,
and 5a is an edge of the bass speaker. In such a conventional speaker, the sound radiated from
the high-pitched noise EndPage: 1-car 2 travels on the surface of the diaphragm 40 of the bass
speaker, and the concave 8 there. There is a sound 7 that is reflected back to the front direction.
Since there is a phase shift between the two sounds 6 and 7 according to the difference in
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distance, interference occurs on the front axis, and the sound pressure characteristic on the front
axis of the high-tone speaker is disturbed. In particular, when the edge 5a as shown in FIG. 1 has
a roll shape, the effect is large, and a large peak or delay occurs in the sound pressure
characteristic of the high-tone speaker 2. In order to solve this, it is conceivable to use the
waveform edge 5b as a bass speaker as shown in FIG. The difference between the speaker shown
in FIG. 2 and the speaker shown in FIG. 1 is the shape of the edge of the bass speaker, and the
other parts are the same. Omit. FIG. 3 is a diagram showing the on-axis sound pressure
characteristics of the treble speaker 2 of each of the speakers shown in FIGS. 1 and 2. FIG. 3A
shows the characteristic curve of the speaker shown in FIG. , (B) is the characteristic curve of the
loudspeaker shown in FIG. 2, as can be seen from this FIG. 3, there is disturbance in the
characteristic curve taJ of the loudspeaker using the quadruple edge 5a't- This is hardly seen in
the characteristic curve (b) of the speaker using the waveform edge 5b.
As described above, it can be said that the waveform edge 5b is more advantageous for the treble
speaker 2. However, the characteristics of the bass speaker 1 are better at the roll edge 5a. That
is, (C) and (d) in FIG. 4 show the on-axis sound pressure characteristic curves of the bass speaker
1 in the loudspeakers shown in FIGS. 1 and 2, respectively, and the characteristic tendency is the
roll shape 5a. The speaker shown in FIG. 1 (having the characteristic shown by the curve (e)) is
better. As described above, in the conventional speakers, both the end of the bass speaker 1 as
the cylindrical edge 5a and the end as the waveform edge 5b have advantages and
disadvantages, and an improvement in this respect is desired. . The present invention has been
made in view of the above-described needs, and it is possible to obtain good sound pressure
characteristics for both the bass speaker and the treble speaker by taking advantage of the
advantages of both the roll edge and the waveform edge τ mark 41): off; It is an object of the
present invention to provide a speaker capable of high quality sound reproduction.
スピーカ
The present invention will be described in detail with reference to FIGS. 5 and 6 below. FIG. 5 is a
cross-sectional view showing an embodiment of a loudspeaker according to the present
invention. In FIG. 5, 5C is a double structure edge of a bass speaker, 5a is a roll edge on the back
side thereof, and 5b is a waveform edge on the front side. The other parts are the same as in FIG.
1 and FIG. 2, so the same reference numerals are given to the same parts and the description will
be omitted. That is, according to the present invention, the edge f of the low-frequency speaker
has a double structure, and reference is made to 5C in the figure) 1 waveform edge on the front
side and roll edge 5ai on the rear side. Therefore, according to the present invention, since the
high-pitched speaker 2 has one flat periphery, the disturbance of the high-pressure characteristic
disappears, and the low-pitched characteristic exhibits a good sound pressure characteristic due
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to the effect of the roll edge 5a. FIG. 6 is a diagram showing the bass characteristic curve (e) and
the treble characteristic curve M (f) of the loudspeaker according to the present invention shown
in FIG. 5, and from this diagram both have good sound pressure characteristics. I understand
that. As described above, according to the present invention, in the composite coaxial speaker,
the edge of the bass speaker has a double structure, the edge on the front side is a waveform,
and the edge on the rear side is a quadruple. It is possible to obtain good sound pressure
characteristics for both the low-pitched speaker and the high-pitched sound f-force, and it is
possible to reproduce sound of good quality.
4. Brief description of the drawings FIGS. 1 and 2 are cross-sectional views of a conventional
speaker, and FIG. 3 is a sound pressure characteristic diagram of a high-tone speaker in the
conventional speaker shown in FIGS. The fourth factor is also the sound pressure characteristics
of the bass speaker, FIG. 5 is a sectional view showing an embodiment of the loudspeaker
according to the present invention, and FIG. 6 is a bass loudspeaker and treble loudspeaker in the
loudspeaker according to the present invention shown in FIG. It is a sound pressure
characteristic view. 1 ... low-pitched speaker, 2 ... high-pitched speaker, 5a ... i · EndPage: 2 rollshaped edge, 5b ... waveform edge% 5C ... double-structured edge (double edge). In the drawings,
the same reference numerals indicate the same or corresponding parts. Agent Shino Shino-1m
Fang 3! ! I 'IF 4m same number (Hz) Fang 6! 5 field number (Hz) EndPage: 3
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