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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a Heil system speaker,
FIG. 2 is a perspective view showing a diaphragm portion of the speaker of FIG. 1 and FIG. 3 and
FIG. Fig. 5 is an explanatory view for explaining an acoustic effect when using a Heil system
speaker, and Fig. 6 is a diagram of the Heil system sip · one key. FIG. 7 is a graph showing
frequency-to-sound pressure level characteristics in each direction in the state of FIG. 6, and FIG.
8 is a plan view showing in principle the speaker device based on the present invention. Fig. 9 is
a graph showing frequency pressure versus sound pressure level characteristics in each direction
in the apparatus of Fig. 8, Fig. 10 is a perspective view showing a speaker apparatus according to
the first embodiment of the present invention, and Fig. 11 is Fig. 10 is a longitudinal sectional
view of the speaker device of FIG. 10, and FIG. 12 shows a state of stereo listening with the
speaker device of FIG. A plan view, FIG. 13 is a plan view for explaining the characteristics in
each angular direction in the speaker apparatus of FIG. 10, and FIGS. 14a and 14b are
frequencies in each angular direction shown in FIG. FIG. 15 is a perspective view of the speaker
apparatus according to the second embodiment of the present invention, and FIG. 16 is a
perspective view of the speaker apparatus according to the third embodiment of the present
invention. Further, in the reference numerals used in the drawings, 51 is a speaker unit, 52 is a
reflection plate, 61 is a closed box, 62 is a speaker unit for bass, 64 is a speaker unit for middle
and high sound, 65 is a shaft, 67 is a support bracket , 69 is a rising portion, and 70 is a
reflecting surface. Fig. 1-61-Capsule opening 51-I 03 928 (2) Fig. 2 Fig. 3 Fig. 4 Fig. 6-62-i 〆 開
1−1 51-1o 3928 (4) Fig. 12 (Fig. 13) a) Fig. 14} 7-7 . J;ク3 さ・・. ミ.
”<,H’%.,,. /− −. 二 2-. ・“//″′.(. (4/.. "I V-. -1106-one lower
part · · · J J 〃 4 ・-one r mark IK / f I liquid f 2 (6 Klk W 20 k one weight φ ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved
speaker apparatus suitable for 11 to 9 loudspeakers,% to electrical sound in the middle to high
range I # smart switching. (1) In a speaker system, an enclosure or closed box is generally used
to remove the influence of back noise. Using a suitable closed box can eliminate the effects of
back noise, but it can not effectively use back noise, so use a phase-reversal box to enrich the
bass May be configured as well. However, the structure of the box is complicated and hence
expensive, and there are some problems in practical use. Oh, recently, Mr. Oscar Bail has made
M-contracted loudspeakers with a contract system 7 that corrected the defect of the conventional
converter, or there was a defect in the device using this loudspeaker unit. As to this Noil type
speaker, this speaker has four ferrite magnets ill + 21 + 31 (shown at at), and a strong magnetic
field in the direction indicated by the arrow + Ftl + 61 generated from il is disposed at the center
2 A ribbon-like conductor (not shown in FIG. 1) applied to the vibrating membrane (7) and
attached to the vibrating membrane (7) or forming the vibrating membrane + It is configured to
convert voice current into sound by moving current. In FIG. 1, a hole piece for forming an
8149111 [1 (1) l magnetic field, a supporting member of 11 "6131u magnet, t141151 is a
nonmagnetic spacer, (19? A frame holding a), a town) is a cover. FIG. 2 shows the vibrating
membrane (7) in more detail, and this vibration $ t7 + has a plurality of folds + n so that the
ribbon-like conductor extends upward and downward in the folds of each pair. It is applied to
one. The electroparental connection of the conductor factor 1 is such that the current in the
reverse direction is af to one that is based on the handle which is apparent from FIG. The
direction of current changes alternately from top to bottom and from bottom to top in fi (b).
Therefore, now, when the voice signal of the first direction is supplied to the conductor (c), the
vibrating membrane is placed in a strong magnetic field, and it is shown in W, Fig. 3 according to
the flamening law. As for the elbow, the arrow 12 (moving respectively in the direction of 24 :,
the air layer 12 + 127 G υ is opened, the air layer f 2817) is closed, and therefore the air is
drawn in the direction of arrow G 2 and the arrow (g) Exhausted in the direction of On the other
hand, the voice signal of the second direction opposite to the first direction is supplied to the
conductor C, and as shown in FIG.
')) Move to the arrow m of arrow 1 [7, 房 C2'l □ □ (早 (31) 勿 勿 α) θ 8) (to) opens, so in the
direction of the arrow (g) Exhausted, arrow 1 is sucked in the direction of sister. As a result, 9
vibrations of vibration pJl, i.e., sound waves are generated. The above-mentioned speaker unit is
normally closed as shown in FIG. 85; Sound waves are radiated to the front and back as indicated
by this speaker unit (four powers are directional characteristics @ I4 and false 4 in order to scan
bi-directional characteristics (4)). Therefore, the front sound is transmitted to the listener (path
46) by the direct sound 17 and the back sound is reflected by the reflecting surface i 47 such as
a wall or a ceiling in the path (c), for example, the space sound in the path 畷It is transmitted.
Book 12, in the case of a Western room where the air volume in the room is sufficiently dog-like,
and the surrounding wall and ceiling are close to a hard wall, the reflection of sound waves is
good, and several multiple reflections are repeated and diffused. Because it is transmitted to (ha),
you can expect a nice sense of field. The KW f J partitions like Kagome 15, Japanese style rooms
with less reflection such as shoji, rattan and tatami mats-In a well-formed room, almost no
reflection effect can be expected, especially in the case of narrow floor plans, speakers Since the
listener and the listener are approaching, almost direct sound from Route-1 will be heard. (If it is
mixed with a diffuse (5) false sound, it will be emphasized in a certain band, and it will cause
cancellation-matching in another band, resulting in the sound quality being degraded. For
example, in the free space shown in FIG. 6, the speaker unit (-42 in the free space, the local wave
number vs. W level in the front & 111 ° 0 ° direction, frequency vs. the sound in 45 °
direction). By measuring the pressure level, the results shown in the curve + al and lb1 of FIG. 7
are obtained. The characteristic in the direction of the surface curve 1 al 0 ° is shown, and the
characteristic in the direction of the curve 1 bl 45 ° is shown. As is apparent from this
characteristic curve, in the 45 ′ ′ direction, the sound pressure drops at high pitches. Indeed,
in the configuration as shown in FIG. 5, the high-pitched speaker in the low-pitched box housed
in the T-box 11 is a uni-directional sound source, whereas the middle-to-high-pitched speaker
system 142 is a bi-directional sound At the age of the sea, the distribution of people is different,
and (6) there is a disadvantage that a sense of unity as one speaker device can not be obtained.
Then, this invention mainly aims at providing the speaker apparatus which can eliminate the
above-mentioned fault. Hereinafter, the speaker device according to the present invention has a
bidirectional speaker unit for radiating sound waves to the front side and the back side of the
vibrating plate or the vibrating body of the vibrating membrane in a dense box. A sound wave
length λ at a predetermined interval, that is, the lowest frequency f of the reflected sound wave,
which is provided substantially in an exposed state, that is, in free space, without being attached.
-For example, if fl is IKHz, a reflecting surface for reflecting the front on the back with an interval
of 7 to 8 m, preferably the width is the lowest frequency f, and the sound wave length λ (7) is
equal to #Y If the size, for example, f, is IKHz, it is characterized in that a reflecting surface
portion of about 30 to 40 saws is provided integrally with the casting portion of the bidirectional speaker unit.
FIG. 8 is a plan view for explaining the present invention and is a rectangular wooden reflector
plate 6 δ of 43 vertical and 3 Q c IR lateral with a space of about 7 on the back side of the bidirectional speaker unit 6 '. Set up and show 7 states. When the reflection plate 63 is provided in
this way and the frequency-to-sound pressure level characteristics in the Direction and Direction are examined, the characteristic surface slackness and ldl shown in FIG. It
turns out that if the sound in the 0 ° direction is improved, the sound pressure distribution is
improved [7]. Through. In particular, the rise in sound pressure was found in the high tone range,
and it was found that the directivity distribution was significantly improved. Next, an
embodiment of the present invention will be described based on the drawings. (8) FIGS. 10 and
11 are a perspective view and a cross-sectional view of a speaker device according to the
embodiment of @ 1 of the present invention. In this figure, 6B is a closed box having an internal
volume of about fiOA, in which 300 yaw / speaker units 121 for bass are attached. A stage S- is
provided in the closed box 611, and it is a vial system as shown in FIG. 1 to FIG. 4 and a
directional system of +5 c and a directional characteristic line +4 c (44 J as shown in FIG. A
speaker unit 141 for middle and high-pitched sound, which has a bi-directional characteristic 1,
is disposed. ff1l, speaker unit-supported by shaft □ 1 、, shaft till against closed box 11 【【7 to
す す す す す ス ス ス ヒ ー カ カ カ カ カ カ カ カ b b) It is supposed to be displaced. Also, the
slider unit 641 is attached to the support bracket 171 so that it can be turned in the direction of
arrow 0 (9) with respect to the U-shaped support metal J and 1Fi 71 integrated with the shaft
can. It is done. A speaker unit (a reflection surface σ 01 in front of the rear surface of the bag) is
formed by the rising portion 161 c from the step 1 to which the middle to high-tone speaker unit
# 34) is attached. In the case of this embodiment, since the lowest harmonic number f1 of the
middle to high-pitched speaker unit is IKHz, the interval between the back surface of the speaker
unit and the opposite t "infilll is about 7 crn. Further, the width of the reflecting ridge is the width
of the closed node Ill and the width Idl, and is about 45 crn, which is the minimum sound wave
length λ above. Also, the height of the reflective surface qO) is somewhat higher (about 30 cIn)
than the height of the speaker unit 呵). In addition, (σ7 is a sound absorbing material). A saran
net O1 is provided so as to surround the speaker unit ul of [3 and the middle and high-pitched
piece (in the case of 〆1 not shown, but for the low-frequency squika kainin)], the external shape
as a whole is a rectangular parallelepiped.
Therefore, although the speaker unit for middle and high tone is functionally in the #i exposed
state KTo, the appearance is in the non-exposed state in the saran net. When two sets of the
above-mentioned speaker devices are prepared and are to be listened to in stereo, they are
arranged as shown in FIG. That is, if it is not supposed that the closed box It + an 'in which the
speaker unit for the low frequency sound is accommodated for the effective space * 1 or the
interior decoration of the indoor space is not directed to the listener 0, The sound axis ff4) C1ef
of the speaker unit wrz for middle and high-pitched sound converges in the direction of the
listener .sigma.J, that is, has a deflection angle (0), for example, 30 degrees. Deflection (5! If) can
adjust the shaft can to a new position by turning the arrow-K. If there is a difference between the
height of the listener's ear and the height of the middle-high-pitched speaker unit, for example,
the position indicated by the dotted line at line 119, that is, the speaker unit only once -Rotate
the sound axis to the direction of the listener. Then, preferably, the plane including the sound
axis (d) of the low-pitch speaker unit ff1) and the sound axis of the middle-high-pitched speaker
unit coincide with each other at the position of the listener. In the stereo listening shown in FIG.
12, the sound axis of the bass speaker unit II) is not directed to the listener CI3, but since the
bass is not sharp in the directivity characteristic, it is practically different as shown in FIG. When
the sound pressure in the direction of +60 to -120 in this state was measured by inclining the
middle to high-pitched speaker unit 30 by 30 degrees, the characteristic curve shown in FIG. 14
faltbl could be obtained. 'This measurement is performed at 70 countries ahead in each angular
direction of I3 \ 1 place, and it approximates to the actual music, and the loudspeaker unit and
the bass and loudspeaker unit are connected by IK by a splitter. This was done by analyzing the
acoustic output with an one-octave band analyzer using a random noise signal with a similar
power spectral distribution. Fig. 14 tal (each of the characteristic curves shown in bl is +60 ",
+30", 0 °, -30 °, -60 °, -90 °, -120 °, Fig. 13) It corresponds to the angle direction of. As
apparent from the characteristic curve of FIG. 14 (bl city), in the speaker device i of this
embodiment, the sound pressure is almost constant in each angular direction, and the sound
pressure distribution is excellent. Therefore, it is possible to obtain a good foreword effect that is
not influenced by the size of the space where the speaker device is installed and the reflection
condition of the wall surface. Also, if the speaker device is configured in this way, (1312.
It is possible to obtain a nearly rational sound pressure distribution without moving the closed
box of the speaker device. That is, since the small and light speaker unit for middle and high
sound can be displaced independently, it is possible to obtain a substantially rational sound
pressure distribution by adjusting the speaker unit. . Also, since the sound axis of one speaker
unit (2) can be displaced, the sound axis of one speaker unit-and the sound axis of the other
speaker unit O can be positioned at the listener's position. It is also possible to make them agree,
and it is also possible to exert a sense of unity as if it were a sole-sound source. Further, in this
embodiment, the middle to high-tone speaker unit − is disposed using the closed box II) of the
low-pitch speaker unit I3, and a part of each closed box I1 Since the formation of the whole is
simplified, the cost is reduced. Next, a speaker apparatus according to a second embodiment of
the present invention will be described based on FIG. However, in FIG. 16 showing this FIG. 15
and the following third embodiment, parts common to FIG. 10 showing the embodiment of the
hall 1 are assigned the same reference numerals, and the explanation thereof is omitted. Also in
the second embodiment, the configuration of the middle to high-pitched speaker unit (good) is
substantially the same as the configuration of FIG. Nine! The only difference is that the reflecting
surface ff0 is formed by a riser which extends from the enclosure 6 '. FIG. 16 is a book showing a
third embodiment of the present invention. In this embodiment, a closed box @ II K step is
provided, a speaker unit for middle-high-pitched sound is hung on the front surface thereof, and
The front surface of the closed box II) is used as a reflection surface σ. In addition, the support
body @ pivots to whitening, and the support body rotates only within the range restricted by the
long hole ■, and the middle and high-tone speaker unit is also rotated with 9 ing. Although the
embodiments of the present invention have been described above, the present invention is not
limited to the above-described embodiments, and may be further deformable. For example,
without using the closed box ε 構成 of the speaker unit for image sound, a reflector may be
provided independently to constitute an independent speaker device. Also, it is acceptable to
keep the example of the speaker unit in a state where there is no gap between the speaker units
and arrange plate-like objects on the speaker unit − and to the left and right 0. However, in this
case, It is necessary to arrange so as not to affect the Also, real (IQ; In the example 2 way
Although the present invention is applied to the i amount, it is also applicable to a 3-way or more
multi-way speaker device. Further, the speaker unit is not limited to the vial type speaker, and
may be another electroacoustic transducer such as an electromagnetic type or an electrostatic
type. However, it is desirable that the directivity characteristics of the front side and the back
side be approximately equal. However, in some cases it may not be equal.
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