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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are sectional and plan views of a lens for
explaining the action of an acoustic lens, FIG. 3 is a sectional view for explaining the action of a
storage chamber, and FIG. Similarly, a sectional view taken along line ii 'of FIG. 3, FIG. 5 is a
perspective view of an embodiment of the present invention, FIG. 6, FIG. 7, and FIG. 8 are
exploded perspective views showing main parts of the embodiment. FIG. 9 is a sectional view of
the same embodiment, FIG. 10, FIG. 11 and FIG. 12 are diagrams showing sound pressure wave
number characteristics of the prior art and the present invention. 8 ...... speaker box, 9 ...... baffle
plate, 10 ...... woofer, 11 ...... housing member 12 ...... storage room 13 Loudspeaker 15 Acoustic
lens 15b Support plate 16 Sound absorbing material.
DETAILED DESCRIPTION OF THE INVENTION-((52 .mu. / 2--The present invention relates to a
speaker apparatus adapted to improve frequency characteristics for sound. Conventionally, it is
known that an acoustic lens is disposed in front of a speaker, and a plane wave emitted from the
speaker is converted into a surface-sampling wave to suppress variations in the sound wave 1.1
characteristics of the sound depending on the listening position. That is, as shown in FIGS. 1 and
2, the speaker 2 is attached to the baffle plate 1, and the acoustic lens 3 in which a plurality of
plates 3a are arranged in parallel is provided on the front surface thereof. At the center of each
plate 3a of this acoustic lens, four portions 3b having a parabolic curved surface are formed.
Therefore, the plane wave A emitted from the speaker 2 passes through the acoustic lens 3 so
that the central part thereof passes to the substantially plane wave by the action of the four parts
3b and both parts are attenuated at the two sides of the four parts 3b of the plate 3a. Phase delay
occurs, and changes like A ′ ′. As a result, the dovetail wave A is converted to a spherical wave
consisting of A 'and A〃. If the acoustic lens 3 is not used as shown in FIG. 10, the sound- ゝ 1 1
M wave number characteristic at each position of 0 °, 30 ° and 4 c in FIG. 2 is particularly
shown in FIG. While there is a large difference in the case of Takatsuki 1-no 3-Castle, that
without the use of the acoustic lens 3 is substantially improved as shown in FIG. On the other
hand, in recent years, it is called Lilua 7-Aze, for sound. Multi-way speaker systems have been
used in which phase image frequency characteristics are flattened. As shown in FIG. 3, this is
achieved by shifting the low-pitched speaker 4 and the high-pitched speaker 6 with respect to
the listening point P and reaching the listening point P across the two speakers 4 and 6
substantially simultaneously. It is intended to flatten the 1N and 1N wave number characteristics
for one use. By the way, when constructing such a multi-way speaker system, as shown in FIG. 3,
if the storage portion 7 is provided in a part of the baffle plate 6 and the high sound speaker 6 is
attached to the bottom surface of this one Frequency characteristics are significantly disturbed.
That is, although the characteristic diagram of FIG. 11 described above is obtained by storing the
acoustic lens 3 in the storage chamber 7 of FIG. 3, it is apparent from this figure that the
listening positions (oO, 3oO). Although the variation of the characteristics due to 46 °) is
suppressed, 2 / each characteristic has a significantly large peak or dip as compared with FIG.
From this, in the speaker apparatus provided with the storage room 7 as shown in FIG. 3, even if
the characteristic is improved by using the acoustic lens 3, the characteristics of the storage
room 7 can be obtained by the effect 6 Will be greatly disturbed.
The inventor paid attention to this phenomenon, and as a result of conducting various
experiments, it was found that the disturbance of the above-mentioned characteristic is the cause
of the following reason. That is, as shown in FIG. 4, the G wave emitted from the speaker 5 is
divided into the wave B going straight and the wave B ′ reflected on both inner side surfaces of
the storage chamber 7, and the straight wave B and the reflected wave B It can be considered
that 'is due to the time when the time to reach the listening point P is different. Although the
reason is not clear, the reflected wave at the bottom of -L of the storage room 7 has little
influence. The present invention was devised in view of the following points-F, and when the
speaker is attached to the bottom of the storage room and the acoustic lens is attached to the
inside of the storage room, the sound pressure W is also sufficient. SUMMARY OF THE
INVENTION It is an object of the present invention to provide a six-piece force device in which
the wave number characteristics become flat. An embodiment of the present invention will be
described below with reference to FIG. In the figure, reference numeral 8 is a speaker box, 9 is a
baffle plate, 10 is a bass speaker directly attached to the baffle plate 9, and 11 is a four-part
provided above the baffle plate 9 to form a storage chamber 12 A member for a high-pitched
speaker attached to the bottom surface 126 of the 13-piece storage unit 12, 14 is a fixing screw
for the speaker 13, 16 is an acoustic lens, 16 is a sound absorbing material attached along both
side surfaces 12b and 12b of the storage chamber 12 It is a screw for attaching an acoustic lens
16. Incidentally, as shown in FIG. 8, the acoustic lens 16 is a multi-machine plate 16a provided
with a concave portion having a parabolic curved surface in the center, spaced apart from each
other, and connected by a support plate 1sb + 1sb. The fixing tool 18 to which the screw 17 is
screwed is attached to four places of the rear end. In the above construction, if the spring force
13 is attached as shown in FIG. 6, and then the sound absorbing material 16 and the acoustic
lens 16 are attached as shown in FIG. 7, all are attached as shown in FIG. The sound absorbing
member 16 is securely held between the both end faces of the acoustic lens 16 and the inner
side surfaces 12 b and 12 b of the housing 12 and the support plate 16 b of the acoustic lens 15.
FIG. 12 shows the results of measurement of the Cesium frequency characteristics of the above
embodiment. The acoustic lens 16 is used, the variation due to the listening position is improved
as in FIG. It can be seen that the peaks and dips of the frequency characteristics are greatly
improved by the sound absorption action of 16 and the flat characteristics are obtained over a
wide frequency fine band. According to the results of the experiment, if the front end of the
sound absorbing material 16 is covered with a reflecting plate, and the sound wave trying to pass
through the sound absorbing material 16 forward is shielded by the above reflecting plate, more
τ phase characteristics Is obtained.
And, in the embodiment described in F, the support plate 15b constituting the acoustic lens 16 is
just in front of the sound absorbing material 16! Located at 4, it has the effect of reflection and
slate. Further, since this support plate 1sl) also has a function of holding the @ sound material
16, it is also extremely advantageous in terms of improving the assembling operation. As
described above, according to the present invention, the storage room is formed on the baffle
plate, the speaker is attached to the bottom surface, the acoustic lens is attached to the storage
room, and the sound absorbing material is attached to both inner side walls of the storage room.
Therefore, the action of the acoustic lens can suppress the variation of 1 M wave number
characteristics of sound pressure, and the action of the @ sound material can suppress the
variation of the local wave number characteristics due to the reflection on the inner wall surface
of the storage room. Thus, it is possible to realize very flat frequency characteristics for sound.
Therefore, when configuring a so-called linear phase type multi-way speaker system in which
high, middle, low frequency speakers, etc. are arranged mutually offset to flatten the 9-phase
phase characteristics of the sound phase, a flat baffle plate is used A storage room is provided in
a part of the bench, and when the speaker installation position is shifted by this storage room-11,
it is a function to flatten the noise FF and the circumference-small wave number characteristics
inherent in the linear phase Can be fully demonstrated.
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