JP2501440Y2 - Acoustic reflection focusing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used in, for example, a conference using a television, a conference using a loudspeaker, and the like, and includes a pair of acoustic reflectors and a microphone. The present invention relates to a structure of an acoustic reflection focusing device that realizes efficient input and output of sound by using a speaker and a speaker.

[Problems to be solved by conventional technology and device]

Recently, for example, conference facilities using a television and conference facilities using a telephone are installed in an office so that people at two places far away from each other can exchange opinions with each other.

In this case, if the voice of each person is picked up (input) by the microphone (handset) and the voice is heard by the earphone (handset), the sound output from the earphone (handset) is output by the microphone (handset). It does not affect the phone).
However, when inputting voice with a transmitter, it is necessary to hold the transmitter by hand, which makes it difficult to write.

Further, if earphones or headphones are attached to the ears as a means for allowing a person to hear a voice, they are likely to feel a sense of discomfort or pressure.

As a means of avoiding such a drawback, when a voice is input through a microphone and a voice is output through a speaker, the sound from this speaker is input to the microphone again and is amplified and output from the speaker. Since there is a possibility that so-called howling may occur, it is necessary to devise the installation positional relationship between the speaker and the microphone.

Furthermore, when the sound (voice etc.) output from the speaker is to be heard by a person, the output of the speaker must be increased to some extent, so that the sound from this speaker reaches far away from one room and the microphone is used. If it is installed away from a person's mouth, the sound energy input to this microphone must be increased, so the sound emitted by a person also becomes louder.For example, if the above-mentioned conference equipment is installed in one corner of a large room, Get in the way.

Particularly, in the case of a conference with a large number of people, the voice energy inevitably increases, and the voice easily leaks out from the conference site.

In order to eliminate this inconvenience, it is necessary to devise a meeting room as a separate room or separate a corner room of the office by a soundproof wall.

In order to solve this problem, one of the applicants of the present invention has previously disclosed, as disclosed in Japanese Patent Laid-Open No. 3-49398, a first acoustic reflector and a second acoustic reflector, each of which has a semi-elliptical tubular shape with a major axis divided into two. A reflector is formed in a longitudinal direction such that both cylinder axes thereof extend in the left-right direction, and the first acoustic reflector and the second acoustic reflector are arranged to face each other, and the first acoustic reflector and the first acoustic reflector Two acoustic reflectors are arranged so that the respective focal points of the respective acoustic reflectors are located in the inner diameter portion surrounded by the two acoustic reflectors, and the second acoustic reflector is closer to the second acoustic reflector of the two focal points. A speaker facing the inner surface of the second acoustic reflector is provided at or near the side focal point, and among the two focal points of the first acoustic reflector,
It has been proposed that a microphone facing the inner surface of the first acoustic reflector is arranged at or near the focal point on the side far from the first acoustic reflector.

However, in the above configuration, since a plurality of persons are arranged side by side between the two acoustic reflectors, especially when the number of persons is three or more, the person at the end becomes an obstacle when the person on the center side comes in and out. There was a problem.

It is an object of the present invention to solve this problem and, in particular, to provide a device suitable for a conference of a plurality of people.

[Means for Solving the Problems]

In order to achieve this object, an acoustic reflection focusing device according to a first aspect of the present invention is configured such that a first acoustic reflector having a semi-elliptical tubular cross section with its major axis divided into two parts is elongated so that its tubular axis extends in the left-right direction. And a plurality of second acoustic reflectors facing each other and arranged at appropriate intervals along the longitudinal axis of the first acoustic reflector, and each of the second acoustic reflectors is formed in a semi-elliptical cylindrical shape with a major axis divided into two. And each cylinder axis of each second acoustic reflector is formed to extend in the left-right direction, and each acoustic reflector is formed in the inner diameter portion surrounded by the first acoustic reflector and each second acoustic reflector. Of the second acoustic reflectors are arranged so that their respective focal points are located.
A speaker facing the inner surface of each second acoustic reflector is disposed at or near the focal point on the side closer to each second acoustic reflector among the two focal points, and the two focal points of the first acoustic reflector are provided. Of these, a microphone facing the inner surface of the first acoustic reflector is provided at each focal point on the side far from the first acoustic reflector, or in the vicinity thereof, at each installation location of the second acoustic reflector.

According to a second aspect of the present invention, in the acoustic reflection focusing device according to the first aspect of the present invention, when the plurality of second acoustic reflectors are arranged, each of the second acoustic reflectors has a posture in which the respective cylinder axes are laterally oriented laterally. The configuration is such that the posture can be changed to a vertical and vertical posture.

Further, the invention according to claim 3 is a three-dimensional structure in which a plurality of second acoustic reflectors arranged in the acoustic reflection focusing device of the invention according to claim 1 are replaced by those having a substantially semi-elliptical cylindrical section. It is formed in a substantially semi-elliptical shell shape having a curved surface.

Then, as in the invention according to claim 4, it is preferable to provide the first acoustic reflectors on the table which is long in the left-right direction in order to make it easy to take notes of the conference.

[Operation and effect of device]

According to the configuration of the present invention, of the two focal points for the first acoustic reflector, the sound emitted from the focal point on the side closer to the inner surface of the first acoustic reflector or in the vicinity thereof is emitted to the inner surface of the first acoustic reflector. Far side after being reflected (side close to the inner surface of the second acoustic reflector)
Since the light is collected at the focal point of, the sound can be efficiently collected by the microphone arranged at or near the focal point.

Similarly, of the two focal points for the second acoustic reflector,
Sound from a speaker that is arranged at or near a focal point on the side closer to the inner surface of the second acoustic reflector and that outputs sound toward the inner surface of the acoustic reflector is reflected by the inner surface and the first acoustic reflection is performed. Since the focus is on the side close to the body, the sound from the speaker can be clearly heard by a person's ear located at or near the focal point even if the output of the speaker is small.

Since the plurality of second acoustic reflectors are arranged at appropriate intervals along the axial direction of the left and right long cylinders, when three or more persons are arranged side by side, especially the person on the center side has the first acoustic reflection. When entering and exiting between the body and the second acoustic reflector, it is possible to simultaneously enter and exit between the adjacent second acoustic reflectors without disturbing the person at the end.

Then, as in the invention according to claim 2, the posture of the second acoustic reflector, which is arranged with a plurality of appropriate gaps, is changed to a posture in which the respective cylinder axes are laterally laterally or vertically and vertically. In the case of being configured to rotate as much as possible, the first
When both the acoustic reflector and the plurality of second acoustic reflectors are arranged laterally so that the cylinder axis extends laterally (substantially horizontally), and when formed longitudinally in this lateral direction, each acoustic reflection Since the focus of the ellipse of the body is innumerable continuously along the cylinder axis that is long in the horizontal direction, the sound output point from the microphone, the output point from the speaker, and the auditory point are slightly horizontal. Even if it shifts, it has little effect.

Further, when the second acoustic reflector that reflects and focuses the sound emitted from the speaker is arranged so as to rotate so that the cylinder axis thereof is in the vertical direction, a focal point that directly faces the second acoustic reflector. Since the sound is focused on and the amount of energy of the sound reaching at the position shifted in the lateral direction is small, even when the sound of different contents is sent to the person for each of the second acoustic reflector parts, the sound is adjacent to the side. It becomes difficult to interfere with the hearing of the person who plays the interview, and it is possible to facilitate the hearing for each individual. Therefore, when the cylinder axis of the second acoustic reflector is oriented vertically, the sound is focused at the focal point directly facing the second acoustic reflector, and the amount of sound energy reached at the laterally displaced position is 2nd less
It is possible to send voices with different contents and languages to each of the acoustic reflector parts, and even if applied to a simultaneous interpreting conference, there is an effect that it does not disturb the listening of a person adjacent to the side.

Further, as in the invention according to claim 3, a plurality of second
When each of the acoustic reflectors is formed in the shape of a semi-elliptical shell having a three-dimensional curved surface, the sound is likely to be focused at the focal point directly facing the respective second acoustic reflectors, and the positions are deviated in the lateral direction and the vertical direction. Since the amount of sound energy that reaches the microphone is small and it helps prevent the diffusion of sound energy, if a person, a microphone and a speaker are arranged in the inner diameter part of a pair of acoustic reflectors in the above-mentioned arrangement relationship, the sound generated by the microphone The sound can be collected efficiently, and even if the output of the speaker is reduced, it can be heard well, and the sound can be prevented from leaking to the outside of the device.

In this way, according to the present invention, a plurality of people can arbitrarily move in and out of the inner diameter portion sandwiched by the front and rear acoustic reflectors, but the sound pickup performance of the microphone and the listening performance of the sound from the speaker may deteriorate. It has the effect of being suitable for holding a meeting with a large number of people.

Further, when the first acoustic reflector is provided on the left and right long table, the presence of the table can block the sound so as not to wrap around the lower edge of the first acoustic reflector and leak outside.
It is extremely convenient for taking notes at meetings, etc.
This has the effect that it can also serve as a support device for the acoustic reflector and a sound leakage prevention device.

〔Example〕

Next, examples will be described. The first acoustic reflector 1 and the second acoustic reflector 2 shown in FIGS. 1 to 3 each have a cross-sectional shape that is a substantially semi-elliptical shape that divides the major axis of the ellipse into two, and is in a direction perpendicular to the major axis. Cylinder axis 1c, 2c which is the longitudinal axis
Is a substantially semi-elliptical cylindrical body having a length dimension (L ₁ ) that extends in the left-right longitudinal direction substantially parallel to the floor surface 3 of the room, and is long enough for 3 to 4 people to be positioned side by side at appropriate intervals. That's it.

Each of the first acoustic reflector 1 and the second acoustic reflector 2 has a metal plate member such as an aluminum plate or an iron plate formed so that its inner surface side has a smooth surface because it can reflect sound well.
Molded with synthetic resin material, fiber reinforced synthetic resin (FRP) containing glass fiber or carbon fiber.

Also, the first and second acoustic reflectors 1 and 2 are horizontally long.
The narrow plate-shaped members may be arranged with almost no space so that the cross section has a semi-elliptical shape.

In the embodiment shown in FIG. 2, the first acoustic reflector 1 is attached to and supported by a plurality of left and right vertically adjustable stands 4 standing from the floor surface 3, and the second acoustic reflector 2 is a base. Stand 5
It is supported by a column 6 standing upright.

The height dimension (H ₁ ) between the upper and lower side edges 1a, 1b of the first acoustic reflector 1 is equal to the upper and lower side edges 2a, 2b of the second acoustic reflector 2.
It is formed to be larger than the height dimension (H ₂ ) between them.

The first acoustic reflector 1 and the second acoustic reflector 2 are arranged so as to face each other, and the two focal points of the first acoustic reflector 1 are F ₁₁ and F _12, and the second acoustic reflector 2 F ₂₁ , F
₂₂ is arranged so that these four focal points enter the inner diameter portion surrounded by the two acoustic reflectors 1 and 2.

Further, a person can enter and leave the first acoustic reflector 1 and the second acoustic reflector 2 that are arranged to face each other from both left and right sides or between one side of both acoustic reflectors, and The inner diameter portion is arranged with a front-rear interval so that a person can sit on the seat portion 7 such as a chair.

Then, of the two focal points of the first acoustic reflector 1,
In the vicinity of the focal point F ₁₁ on the side closer to the inner surface of the first acoustic reflector 1, the mouth (speaker) of a person who sits or stands facing the inner surface of the first acoustic reflector 1 is positioned. The microphone 8 is arranged so as to face the inner surface of the first acoustic reflector 1 at or near the far-side focal point F _{12 of the} two focal points of the first acoustic reflector 1. The sound emitted from the first acoustic reflector 1 is reflected by the inner surface of the first acoustic reflector 1 so that the microphone 8 can efficiently collect the sound.

In addition, of the two focal points of the second acoustic reflector 2, at the focal point F ₂₁ on the side closer to the second acoustic reflector 2 or in the vicinity thereof, the speaker 9 is directed toward the inner surface of the second acoustic reflector. And a focus F on the side close to the first acoustic reflector 1.
₂₂ The ear of the person should be located in the vicinity.

In this case, the microphone 8 and the speaker 9 are mounted on the columns 10 and 11 which stand upright from the base 5.
The columns 10 and 11 have a structure (not shown) that can be moved or expanded / contracted so as to be adjustable in the front-rear position and the height position so that they can be easily aligned with the F ₁₂ and F ₂₁ positions or in the vicinity thereof.

Furthermore, as shown in FIG.
Further, the microphone 8 and the speaker 9 are arranged behind each seat portion 7, respectively. In the embodiment, three speakers 9 and three microphones 8 are arranged for three seats.

According to this structure, the sound emitted from one focus point in one ellipse and reflected on the inner surface of the ellipse is collected in the other focus point, and the energy of the sound is difficult to diffuse, and the property of the ellipse can be utilized. .

That is, the sound emitted from the vicinity of the focus F ₁₁ on the side closer to the inner surface of the first acoustic reflector can be efficiently collected by the microphone 8 located in the vicinity of the focus F ₁₂ and directed toward the first acoustic reflector 1. Of.

In this case, the first acoustic reflector 1 and the second acoustic reflector 2
Are substantially semi-elliptical cylinders that are horizontally long, so that their respective focal points for the first acoustic reflector 1 and the second acoustic reflector 2 are parallel to the cylinder axis 1c, 2c of each acoustic reflector. In the plan view of FIG. 3, for example, the voice spoken by a person at the center of the left and right can be picked up by microphones 8 and 8 on the left and right sides other than the microphone 8 directly behind the person. With the microphones 8 on both sides, the distance from the utterance part becomes long, and there is a risk of arrival time difference with the microphone 8 located at the shortest distance and reverberation (echo). Preference is given to using.

Further, it is desirable that the directional characteristics of each microphone 8 have a large directivity in the inner surface direction of the first acoustic reflector 1 and no directivity in the inner surface direction of the second acoustic reflector 2.

Similarly, the sound from the speaker 9 output toward the inner surface of the second acoustic reflector 2 is reflected by the inner surface of the second acoustic reflector 2 and is reflected by the human ear located near the other focus F _22. Since the sound is collected, the sound from the speaker can be heard well by the human ear at the position facing the first acoustic reflector 1 without increasing the output from the speaker 5.

Note that, as described above, the voice spoken toward the horizontally long first acoustic reflector 1 can be efficiently picked up by the microphone at the focal position in the diagonally rearward direction, and conversely, toward the second acoustic reflector 2. Similarly, since the output sound of the speaker reaches the human ears (in the vicinity of the focus position) obliquely forward in the horizontal direction, the number of the microphones 8 and / or the speakers 9 installed is between the adjacent seats 7. Rearward, the number of microphones 8 and / or speakers 9 is smaller than the number of seats.
May be provided, and the person who sits on the seat portion 7 is the first
Even if the sound reflector 1 slightly shifts in the cylinder axis direction, there is no inconvenience in collecting and listening to voice.

On the contrary, as shown by the alternate long and short dash line in FIG. 3, when a partition plate 12 is provided on the inner surface of the first acoustic reflector 1 to divide the seat portion into seven seat portions, at least the number of the microphones 8 should be at least one. It is desirable to provide only the number.

Then, by forming the first acoustic reflector 1 and the second acoustic reflector 2 in a laterally long shape, a plurality of people can sit side by side in a conference device that uses the pair of acoustic reflectors, and gather together at one place for an efficient conference. Can proceed.

In addition, by increasing the height dimension (H ₁ ) of the first acoustic reflector 1, the sound emitted from the human mouth and the sound from the speaker wrap around the edge of the first acoustic reflector 1 due to the diffractive action of the sound. Thus, it is possible to reduce the phenomenon of leakage in the forward direction.

In the embodiment shown in FIGS. 4 and 5, the second acoustic reflector 2 arranged opposite to the horizontally long first acoustic reflector 1 has a small size (height dimension (H ₂ ), length dimension (L ₂ )), And a plurality of the second acoustic reflectors 2 are arranged at appropriate intervals (L ₃₎ according to the number of seats of a person facing the first acoustic reflector 1. ) Install them separately.

In this case, as shown by the solid line in FIG. 4, if each of the second acoustic reflectors 2 is arranged so that its cylinder axis 2c is oriented substantially horizontally, the same action as in the embodiment of FIG. While it is possible to achieve the effect, it is possible for a large number of people to go in and out at a time because a person can enter and leave through the gap between the adjacent second acoustic reflectors 2 and 2. This has the effect of eliminating waste.

Further, each of the small second acoustic reflectors 2 has a posture in which its cylinder axis 2c is oriented vertically (shown by a chain line in FIG. 4).
Alternatively, the posture can be changed to a horizontal posture (shown by the solid line in FIG. 4). In this case, as described above, each second acoustic reflector 2 is attached to the rotating portion 13 such as the drive motor provided on the column 6 standing upright from the base 5, so that the second acoustic reflector 2 can be rotated around the rotating portion 13. It may be configured or may be detachably configured so that the mounting posture can be changed.

Also in these embodiments, the microphone 8 and the speaker 9 are installed at the focal points F ₁₂ , F ₂₁ or in the vicinity thereof, as in the embodiment of FIG.
The number of the speakers 9 and the number of the speakers 9 are equal to the number of the second acoustic reflectors 2, and the speakers 9 are disposed in front of the second acoustic reflectors 2.

When the second acoustic reflectors 2 are arranged so that the cylinder axis 2c is in the vertical direction as described above, the sound from the speaker 9 output toward the second acoustic reflector 2 is Although it is focused on the focal point F22 at the front position and can be heard well at the part of the person's ear at that position, the amount of sound energy that arrives at a position laterally (left and right) is reduced, so that the person's lateral position is reduced. It becomes hard for the person in the position to hear. Therefore, for example, if you want to seat multiple people on the left and right at an international conference, and want each person to simultaneously interpret in a different language and hear the content of the conference,
Separate sounds can be output from the speakers 9 at each of the two second acoustic reflectors, and in that case, there is no confusion with each other.

Then, as described above, when the posture of the second acoustic reflector 2 is set to be horizontally long, the sound from one speaker 9 can be heard by a plurality of persons in front of the speaker substantially at the same time. When 2 is switched to the vertical posture, the sound can be heard individually for each speaker 9, so that any one of the plurality of second acoustic reflectors 2 is vertically oriented,
It is also possible to adopt a usage pattern in which other elements are turned sideways.

FIG. 6 shows a second acoustic reflector 14 in the shape of a semi-elliptical shell obtained by dividing an elliptical spherical shell by its major axis, and in place of the second acoustic reflector 2 shown in FIGS. The second acoustic reflectors 14 are arranged so that the inner diameter side (cavity side) of the substantially semi-elliptical shell of each second acoustic reflector 14 faces the inner surface of the first acoustic reflector 1. Microphone 8 and speaker 9 in this case
The arrangement positional relationship of is also substantially the same as that in each of the embodiments. Normal,
The speaker 9 is located in the inner diameter portion (inside the hollow portion) of the semi-elliptical shell.

If the second semi-elliptical shell-like second acoustic reflector 14 is used, the sound emitted from the speaker 9 and reflected on the inner surface of the second acoustic reflector 14 is focused on the other focus F of the second acoustic reflector 14. _{twenty two}
Since the degree of focusing on the sound is strong and the diffusion of the sound can be greatly suppressed, the small second acoustic reflector 14 is used, and the output of the speaker 9 is made small, and the sound is reliably transmitted to each person. You can train them. Moreover, as described above, if the second acoustic reflector formed in a substantially semi-elliptical shell shape is adopted, it is possible to more efficiently focus the sound energy to the portion directly facing the second acoustic reflector. Therefore, even if the output of the speaker is small, it is possible to hear clearly, and the shape of the second acoustic reflector can be made compact, and the acoustic reflection / focusing device can be made compact. Therefore, it is possible to transmit individual content or language to each person as in an international conference.

In the embodiment shown in FIG. 7, the horizontally long first acoustic reflector 1 shown in FIGS. 1 to 6 is mounted on a vertically long table 15, and a seat portion such as a chair is provided in front of the table 15. It is convenient for people sitting in to take notes of meetings. Also the table
Since the lower part of the first acoustic reflector 1 is shielded from the floor surface 3 by the top plate 16 of 15, it is possible to reduce the sound leaking to the outside around the lower edge of the first acoustic reflector 1. .

Further, by mounting the small second acoustic reflector 2 shown in FIGS. 1 to 5 on the cabinet 17 such as a bookshelf shown in FIG. 7, the base 5 as described above can be eliminated, and At the 18 vertical panels (the upper and lower portions and the left and right side portions where the second acoustic reflector 2 is arranged) of the cabinet 18, the sound coming from the direction of the first acoustic reflector 1 should not leak backward. You can block it. In this case, if a sound absorbing material is stretched over the vertical panel 18, it is possible to prevent the echo of the sound and further improve the performance of listening to the sound (clarity of the sound or the like).

Further, a vertical panel 18 for partitioning in the cabinet 18 may be sandwiched between the second acoustic reflector 2 on one side and a shelf 19 for document storage on the other side.

It should be noted that the second acoustic reflector 2 provided in the caninet 17 may be configured to be rotatable about 13 rotation portions in a posture in which the cylinder axis is in the horizontal direction and a posture in which the cylinder axis is in the vertical direction (vertical direction). However, it goes without saying that the second acoustic reflectors 2 may be rearranged on the upper and lower shelves so as to be detachable so that the height can be adjusted.

In the embodiment shown in FIG. 8, the second acoustic reflectors 2, 2 are provided back to back on the front and back sides of the vertical panel 18 of the cabinet 20 or the first acoustic reflector 1 and the second acoustic reflector 2 are placed back to back. The first with two tables
While arranging the acoustic reflectors 1 facing each other, the second
By disposing the cabinet 20 having the acoustic reflectors 2, 2 provided back to back, two pairs of conference facilities can be formed at once.

If the plurality of cabinets 20 in which the first acoustic reflector 1 and the second acoustic reflector 2 are provided back to back are arranged at appropriate intervals, a plurality of conference facilities can be formed also by this.

Further, in the first acoustic reflector 1 in each of the above-mentioned embodiments,
A television CRT (display device) 21 that can be viewed by a person located on the inner surface side may be provided.

Further, it is needless to say that a comprehensive amplifier associated with the microphone 8 and the speaker 9 and transmission / reception equipment for TV / voice etc. are provided, and in a conference with a remote place, a telephone network or data communication DDX network, ISDN network, etc. can be used.

FIG. 9 is a schematic view of the first acoustic reflector 1 and the second acoustic reflector 2 as seen in a side cross-section. As shown in this figure, the major axis 22 and the second acoustic reflection in the first acoustic reflector 1 are shown. When the major axis line 23 of the body 2 is arranged so as to be inclined so as to intersect each other at an angle (θ), the positional relationship between the two focal points F ₁₁ and F ₁₂ of the first acoustic reflector 1 and the second acoustic The two focal points F ₂₁ and F _{22 of the} reflector 2 can be displaced both in the direction of the major axis and in the vertical direction, and the focal points F ₁₁ and F _{22 at} which the human mouth and ears should be located are close to each other. However, the focus F ₁₂ where the microphone 8 should be located and the focus F ₂₁ where the speaker 9 should be located can be set apart from each other.

If the tilt angles of the first acoustic reflector 1 and the second acoustic reflector 2 are adjustable, the person sitting on the seat 7 can be seated without changing the installation height of each acoustic reflector. According to the sitting height, the sound of the speaker 9 can be efficiently reflected and the voice of a person can be efficiently picked up by the microphone 8.

Further, the installation height of the second acoustic reflector 2 arranged behind the person may be lowered, and the major axis 23 of the second acoustic reflector 2 may be inclined so as to incline upward toward the first acoustic reflector 1. Of.

FIG. 10 shows a case that has staggering the installation height of the first acoustic reflector 1 (H ₃₎ and the second installation height of the acoustic reflector 2 (H _4), sits on the seat portion is also thereby It is possible to optimize the sound pickup and listening according to the sitting height of a person, and therefore, it is only necessary to adjust the height of both acoustic reflectors as described above.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view of the device,
2 is a sectional view taken along line II-II in FIG. 3, and FIG. 3 is III in FIG.
-III sectional view, FIG. 4 is a perspective view of the second embodiment, FIG. 5 is a plan sectional view, FIG. 6 is a perspective view of another embodiment of the second acoustic reflector, and FIG. FIG. 8 is a side sectional view of an embodiment, FIG. 8 is a side sectional view of an embodiment in which an acoustic reflector is provided in a cabinet, and FIGS. 9 and 10 are arrangement relationships between a first acoustic reflector and a second acoustic reflector. It is a schematic explanatory view showing. 1 ... 1st acoustic reflector, 2, 14 ... 2nd acoustic reflector, 3 ...
… Floor, 4… Stand, 5… Base, 6,10,11… Posts, 7… Seat, 8… Microphone, 9… Speaker, 12… Divider, 13… times Moving part, 15 ... table, 16
…… Top plate, 17,20 …… Cabinet, 19 …… Shelves, 21…
… CRT, 22,23 …… major axis.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeshi Umezawa 1-6-11 Awaji-cho, Chuo-ku, Osaka-shi, Osaka Itoki Co., Ltd. (72) Shunichi Takamatsu 1-4, Imafuku-hi, Joto-ku, Osaka-shi, Osaka No. 18 Inside Ito Kisho Co., Ltd. (72) Inventor Keisuke Yoshimatsu 1-4-4 Imafukuhigashi, Joto-ku, Osaka City, Osaka Prefecture No. 18 Inside Ito Ki Co., Ltd. (72) Creator Tsuji Machimura Joto-ku, Osaka City, Osaka Prefecture Imafuku Higashi 1-4-18 Ito Ki Kosakusho Co., Ltd. (72) Inventor Naofumi Inmaki 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Creator Kazunori Shimamura Uchi-yuki-cho, Chiyoda-ku, Tokyo 1-6-1 No. 6 Nippon Telegraph and Telephone Corporation (56) Reference JP-A-3-49398 (JP, A)

Claims (4)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. A first acoustic reflector having a semi-elliptical tubular cross section whose major axis is divided into two halves, is formed longitudinally so that its tubular axis extends in the left-right direction, and is opposed to the first acoustic reflector. A plurality of second acoustic reflectors, which are arranged at appropriate intervals along the axis, are formed in a substantially semi-elliptical tubular shape with a major axis bisected, and each tubular axis of each second acoustic reflector is in the left-right direction. The first acoustic reflector and the second acoustic reflectors so that the focal points of the acoustic reflectors are located in the inner diameter portion surrounded by the first acoustic reflector and the second acoustic reflectors. Of the two focal points of the acoustic reflector, a speaker facing the inner surface of the second acoustic reflector is arranged at or near the focal point on the side closer to the second acoustic reflector, and the first acoustic reflector is provided. Of the two focal points of the first sound reflector at or near the focal point on the side far from the first acoustic reflector. The microphone toward the inner surface of the reflector, an acoustic reflector focusing device being characterized in that disposed in each second acoustic reflector installation site. 2. The acoustic reflector according to claim 1, wherein each of the second acoustic reflectors is configured to be capable of changing its posture into a posture in which each cylinder axis thereof is in a horizontal direction and a posture in which a vertical direction is in a vertical direction. Focusing device. 3. A first acoustic reflector having a semi-elliptical tubular cross section whose major axis is divided into two halves is formed longitudinally so that its tubular axis extends in the left-right direction and is substantially parallel to the tubular axis of the first acoustic reflector. A plurality of second acoustic reflectors, which are arranged at appropriate intervals, are formed in a substantially semi-elliptical shell shape, and the acoustics of the second acoustic reflectors are formed in a portion surrounded by the first acoustic reflector and the second acoustic reflectors. The two reflectors are arranged so as to face each other so that the respective focal points of the reflectors are located. Of the two focal points of the second acoustic reflectors, the focal points on the side closer to the second acoustic reflectors or in the vicinity thereof are A speaker facing the inner surface of the second acoustic reflector is provided, and the first acoustic reflection is provided at or near the focal point on the side far from the first acoustic reflector among the two focal points of the first acoustic reflector. A sound characterized by arranging a microphone directed to the inner surface of the body at each installation location of the second acoustic reflector. Reflective focusing device. 4. The acoustic reflection focusing device according to any one of claims 1 to 3, wherein the first acoustic reflector is provided on a table which is long in the left-right direction.