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JPS60199296

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DESCRIPTION JPS60199296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a speaker device, and more particularly, to a speaker device capable of selecting
omnidirectionality and directivity. [Prior Art] FIG. 1 is a cross-sectional view showing an example
of a conventional nondirectional speaker device. In FIG. 1, (1) is a cone-shaped speaker for high
sound and (1a) is for bass. Cone-shaped speaker, +21 is a conical diffuser with a triangular crosssection whose apex faces the speaker fllK to diffuse the sound wave from the high-tone speaker
in the 660 ° direction, (2a) Also, a conical diffuser with a triangular Wr surface to make sound
waves from the bass speaker (1a) nondirectional, (3) is the treble speaker f1), the bass speaker
(1a), the diffuser (2) , (2a) is a cabinet whose shape and volume are determined in order to fix the
characteristics of the speaker. In the conventional nondirectional speaker configured in this
manner, the sound waves from the high-tone speaker 111 and the bass speaker (1a) are
respectively reflected and diffused by the diffuser (21, 2a), and are easily made nondirectional.
Similar characteristics can be realized. However, even in the non-directional speaker described
above, the flatness of the on-axis sound pressure-frequency characteristic is inferior by -MK
when compared with a normal speaker device in which each unit is disposed on the speaker axis,
ie, in the listening position direction. . In particular, there are a lot of level shortages in the
midrange, so this is shown in Fig. 1 as described in "The latest Hi-Ff speaker and its lively usage"
(Seifangdo Shinkosha Showa 51). In the conventional non-directional speaker system, a method
of using a full band speaker for changing a unit for high-pitched sound, a method of separately
attaching a low-range speaker in the listening position direction of the middle yavinet side, etc.
There is. Such a conventional nondirectional speaker device can easily obtain characteristics
close to nondirectional, but has the following drawbacks. That is, when a listener wants to listen
on an axis like a normal speaker device, it is inconvenient in the conventional nondirectional
speaker device fixed in the nondirectional property. In addition, although a device shown in FIG.
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1 for taking the diffuser at the upper part of the cabinet and pointing the treble to the listening
position may be considered, in general, one speaker cabinet is a heavy and easy to realize means.
It was not. SUMMARY OF THE INVENTION The present invention has been made to eliminate the
disadvantages of the above-mentioned prior art, in which the speaker is rotatably disposed, and
when it is opposed to the diffuser, it is omnidirectional, the diffuser It is an object of the present
invention to provide a speaker device which is directional when it is directed to a position where
it does not receive the effect of the speaker, and which can easily select one directivity or
nondirectional.
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a cross-sectional view of an essential part showing a first embodiment of the present
invention, and in FIG. In addition, (Ia) is for low and medium sound, and is a high-pitched sound
speaker (having a diameter of 20 steel which enables reproduction of a wide band together with
the high-pitched speaker 11). (2) is a conical diffuser having a triangular cross section for
reflecting the sound wave from the high-tone speaker and making it omnidirectional. Moreover,
it is a cabinet for high-pitched speakers designed, and (5a) is a cabinet for a door for low-pitched
speakers. (4) is a frame, which is connected to the cabinet (6a), has a diffuser (2) at the top, and
the distance between the top of the diffuser (2) and the central part of the treble speaker is about
2.5 cm, A high-pitched speaker (II and cabinet (3) is disposed inside. (5) is a mount, which rotates
the high-sound speaker (1) and the cabinet (3) to the direction of the take-off position, that is, the
direction # is directed to the position # where the diffuser (2) is not affected The position facing
the diffuser (2) is intended to be easily made nondirectional. The speaker (11) and the rotating
part (6) of the cabinet (3) have appropriate friction and are fixed at that position even if the hand
is released at the rotated position. When the friction is insufficient, auxiliary means such as
screwing may be used. Next, 1 operation is described. First, consider the bass speaker (1a) with
an aperture 201 (effective vibration radius 8cx) and the high-tone speaker (11 with an effective
vibration radius 2.8 (3 m)). Although directivity differs depending on the shape of the diaphragm,
assuming that the wave number is 1 (a (cm) effective radius of vibration), it is considered that Ka
is about 3 or less in ka, or it is affected by directivity and K is within the range. Since k =-,
substituting the sound velocity C = 34000 / 5eeska = 3, in the low-frequency speaker (1a), the f
for 2000 Hz 1 high f-'(beaker + llf is 5800 Hz for f is directional) It can be said that it is the K
range that receives the influence. Therefore, in the speaker apparatus according to the first
embodiment of the present invention, since the crossover of the bass speaker (1a) and the treble
speaker ill is set to f-1500 Hz, the working frequency range of the bass speaker (1a) Then, it can
be said that it is close to omnidirectional.
Next, for the high-pitched speaker (1), the shape of the diffuser (2), the apex of the diffuser (2)
toss beaker (speaker dust cap apex, to achieve omnidirectionality up to 20,000 Hz within the
playback limit fh of the unit As a result of examining various distances with the above, the high-
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pitched speaker (in 11, a conical diffuser with a triangular cross section in the first embodiment
of the present invention), the above-mentioned distance is about 2.5 cm, and the required
characteristics can be realized. The Also, the high-tone speaker fil attached to the small-volume
cabinet (3), when directed in the listening direction, provides a clear timbre with a good
localization of the sound image as with a normal 2-way speaker device. The In addition, when the
high-tone speaker (11 is made to face the diffuser (2) to be non-directional), straight sound
quality can be obtained at any place. The characteristics are described next. FIG. 6 shows the
sound pressure-frequency characteristics at the shelf 501 when two-way using the low-pitched
speaker (Ia), the high-pitched sound sensor 111, and the network according to the first
embodiment of the present invention. p, relatively flat characteristics from 501z to 20 kHz are
obtained. Also, FIG. 4 shows M151 of the present invention! This is the characteristic when
changing the distance between the high-tone speaker (11 facing the diffuser (2), making it
nondirectional, and changing the diffuser 12) from the speaker, and the above distance is
approximately 2.501 & CL, The on-axis sound pressure frequency characteristics of the above
were obtained closest to the characteristics shown in FIG. In FIG. 4, the characteristics of the
distances 2.51 and 6α are shown shifted by 10 dB for comparison. The characteristics of 2 way
in FIG. 6 are also the same. Although the two-way omnidirectional speaker has been described in
the first embodiment described above, the same effect can be obtained with a three-way 14-way
speaker device. Furthermore, in the case of 1 full band speaker 1c is a king small full range
speaker, as in the second embodiment shown in FIG. 5, the configuration of 1 first embodiment
and IW1 can be easily realized, and omnidirectional Or it can be a directional speaker. In FIG. 5,
the parts denoted by the same reference numerals as in FIG. 2 indicate the same parts, (1b) is a
small full-range speaker, (4a) is 7 frames, and in this embodiment, it also serves as a speaker
stand. FIG. 6 is a sectional view of an essential part showing a sixth embodiment of the present
invention. In FIG. 6, the same parts as FIG. 2 are shown with 1 fil-code. (4) is a frame, which is
connected to the cabinet (3a), and the upper diffuser (2) is disposed, so that the distance between
the top of the diffuser (21 and the central portion of the treble speaker is about 2.5 α, A hightone speaker (1) and a cabinet (3) are disposed inside.
Furthermore, the frame (4) is covered with a mesh (7) through which sound can pass, such as
cloth or net. That is, the high sound speaker (1) and the diffuser (21 are surrounded by the mesh
body (7) to remove dust on the high sound speaker (]) and the design surface is improved. In this
embodiment, the frame (4) is provided at two places, but depending on the material of the netlike body (7), K or the like at four places or six places within a range not affecting the sound box
characteristics. Is preferred. (8) is a rod-shaped body with a knob, which is fixed to the cabinet
N31 through the hole of the frame (4), rotates the cabinet (3 from the outside of the force to
orient the high-tone speaker (1) toward the listening position That is, it is to make it possible to
easily make the direction to a position not influenced by the diffuser (2) directional and to make
the direction opposite to the diffuser (2) non-directional. In addition, the rod body with knob (8)
and the frame (4) have appropriate friction, and the cabinet (3) is fixed at that position even if
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the hand is released at the rotated position. is there. When the friction is insufficient, auxiliary
means such as screwing may be used. As a matter of fact, in this embodiment, the size of the
speaker ', the structure of the gear vignette, the crossover frequency, etc. are mentioned above
except that the treble speaker (1) can be rotated from the outside of the mesh 17). The
characteristics shown in FIG. 3 and FIG. 4 are obtained just as in the embodiment. Furthermore,
the point which can be implemented to the speaker device of 5 W "Is 4 wa y is also the same. FIG.
7 is a sectional view of an essential part showing a fourth embodiment of the present invention.
In the fourth embodiment, the one in the sixth embodiment is applied to a full-band speaker, for
example, a small full-range speaker, and directivity and no directivity can be easily selected as in
the above-described embodiments. . Furthermore, it has dust resistance and is excellent in design.
In FIG. 7, the parts assigned the same reference numerals as those in FIG. 5 and FIG. FIG. 8 is a
front view showing a part of a fifth embodiment of the present invention, and FIG. 9 is an @ 1
view of FIG. In FIGS. 8 and 9, the same parts as in FIG. 2 are shown with the same reference
numerals. (9) is an attachment, fixed on the gear vignette (6a), holding the foot (2a) of the
diffuser (2), and changing the distance between the diffuser (2) and the high-tone speaker (1),
Further, the high-pitched speaker (11 holds a cabinet (3) attached thereto), and the cabinet (3)
can be rotated.
The distance is changed by the incision (2b) provided on the foot (2a). (8a) is a rod-shaped body
with a knob, an external thread is provided in the rod-shaped portion (8b), and an internal thread
is provided in the cabinet f31. Maintain in distance and direction. In this embodiment, as a result
of examining the above-mentioned distance variously, the required characteristics could be
realized with about 2.5 cm as in the first and sixth embodiments and 1 ttl. The treble speaker 9
of the fifth embodiment can be rotated without colliding force with the diffuser at this distance of
2.5 m, but in general, a longer distance is required, and hence the diffuser and The distance to
the speaker needs to be variable. In addition, the distance between the diffuser and the speaker
can be varied K, the degree of non-directionality, the characteristics can be changed, and, of
course, the voice quality can be changed. As a result of the above, a high volume speaker (11
with a small volume of cabinet + 3) K mounted (KFi when directed to the listening direction, a
clear timbre with good localization of the sound image was obtained like a normal 2 way speaker
device. In addition, when the high sound speaker (11 is made to face the diffuser (21 to make it
nondirectional), a continuous sound quality can be obtained at any place. Next, I will describe the
characteristics. Sound pressure-4 mm on axis 501 with 2 way using the low frequency speaker
(1a), high frequency sound speaker (1) and network of the fifth embodiment as in FIG. 6) t)
Relatively flat characteristics from 50 Hz to 20 kHz. Further, FIG. 10 is a characteristic when the
high sound speaker (31 of the fifth practical example is opposed to the diffuser (2) K so as to be
nondirectional, and the distance between the diffuser (2) and the speaker (11 is changed). Oh,
the on-axis sound pressure frequency characteristics when the above distance is set to about
2.5α are the closest to the characteristics shown in the above-mentioned FIG. It has become a
dusty property. In the fifth embodiment described above, a two-way omnidirectional speaker has
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been described, but the same effect can be obtained with a 'W') 'four-way sbeaker device. FIG. 11
is a sectional view of an essential part showing a sixth embodiment of the present invention, and
FIG. 11 is a side view of FIG. The sixth embodiment is an application of the fifth embodiment to a
full-band speaker, for example, a small full-range speaker, and directivity and no directivity can
be easily selected as in the above-described embodiments. In FIGS. 11 and 12, the same parts as
in FIG. 8 and FIG. 9 are indicated by the same reference numerals.
(1b) is a small full-range speaker +, (9a) is a mount, and in this embodiment, it also serves as a
stand for the speaker. According to the present invention, according to the present invention, the
speaker can be rotatably disposed so that the position facing the diffuser and the position facing
the diffuser can be turned to flliK. You can easily select non-directionality and directivity, and you
can listen in excellent sound quality at any listening position. Furthermore, according to the
second invention, in addition to the first invention, the diffuser and the speaker are surrounded
by a mesh-like body through which sound can pass such as cloth or net, and operated from the
outside of the mesh-like body Since the speaker can be rotated K, directivity and non-directivity
can be easily selected, and dust does not adhere to the speaker to prevent deterioration of the
characteristics, which is also excellent in design. Also, according to the sixth invention, in
addition to the first invention, since the distance between the speaker and the diffuser can be
changed, it is easy to select directivity or non-directivity, A speaker device capable of changing
the level of directivity can be obtained. In addition, if the distance between the diffuser and the
speaker should be minimized if the distance between the diffuser and the speaker should be
minimized if the speaker unit is omnidirectional due to the characteristics and shape of the
speaker unit, the speaker can be rotated by changing the distance between the diffuser and the
speaker. Also, when you encounter a diffuser, you can choose 1 nondirectional, directional.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view of an essential part showing an example of a conventional
nondirectional speaker device, FIG. 2 is a sectional view of an essential part showing a first
embodiment of the present invention, and FIG. 3 is a first embodiment of the present invention.
Sound pressure-frequency characteristic in case of applying 2 way speaker [flK, FIG. 4 is sound
pressure-frequency when the distance between the speaker and the diffuser is changed in the
first embodiment of the present invention. FIG. 5 is a cross-sectional view of the main part of the
second embodiment of the present invention, FIG. 16 is a cross-sectional view of the main part of
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the fifth embodiment of the present invention, and FIG. FIG. 8 is a front view partially showing a
cross section of the fifth embodiment of the present invention, FIG. 9 is a side view of FIG. 8, and
FIG. 10 is a sectional view of FIG. A characteristic diagram showing sound pressure-frequency
characteristics when the distance between the speaker and the diffuser is changed in the five
examples. J11 Figure is a fragmentary sectional view showing a sixth embodiment of the present
invention, is a side view of FIG. 12 Fi Figure 11.
In the figure, (1) is a high-tone speaker, (1a) # 'i bass speaker, 12), (2B) Ii diffuser, (3), (3 &) is a
cabinet, (4), (4a) is a frame, + 51 # 'i mounting base, (7) is a net-like body such as a cloth or a net,
(8), (8a, l #' i, tabbed rod body, (9), (9a) # -J mounting rod. In the drawings, the same reference
numerals denote the same or corresponding parts. Agent Patent Attorney Susumu Kimura Figure
1 Figure 2 Figure 4 Figure 4 1002004 ■ lk 2k 4k lok 20kn 喋 (Hz) Figure 5 Figure 7 1 0 Figure
40 1cX) Z 400 400 1k 2k 4k IOk 20 □ Consecutive category number (Hz) Continued on the first
page 0 Agenda) 1) Shigeru Ohkura 2
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