JPH09238391A - Directivity speaker equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the speaker equipment in which a sound leakage of low frequencies attended with the resonance of a reflector horn is reduced so as to more sharpen the directivity thereby delivering sound only beneath of the reflector horn. SOLUTION: A speaker unit 2 is arranged to one focus of a reflector horn 1 so as to direct an aperture of the speaker unit 2 in a direction opposite to the radiation direction of the reflector horn 1. Then a vibrator 8 is fitted to the reflector horn 1 and the resonance generated when a low frequency sound wave emitted from the speaker unit 2 is reflected in the reflector horn 1 is dumped by the vibration generated by the vibrator 8 to suppress the production of the sound wave from the reflector horn 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional speaker device used as a broadcasting facility such as a public address.

[0002]

2. Description of the Related Art In recent years, personalization of devices has been progressing very rapidly, and the demand for transmitting to a specific range or only to specific people has been specifically realized even in public addresses. is there.

12 and 13 show a conventional directional speaker device, respectively. First, a conventional directional speaker device shown in FIG. 12 (hereinafter referred to as a rear open type) will be described.

In this directional speaker device, a speaker unit 2 is attached to one focal point of a spheroidal reflector horn 1. The speaker unit 2 is attached to the baffle plate 3 with its opening surface facing the direction opposite to the radiation direction of the reflector horn 1 and its rear surface opened.

The baffle plate 3 is attached to the reflector horn 1 via three rod-shaped arms 4 in the circumferential direction. 5 is a wiring cord to the speaker unit 2, 6 is a hanging metal fitting, and one end is connected to the ceiling and the other end is connected to the hanging metal fitting 6 by a wire 7 with the reflector horn 1
Is hung from the ceiling.

First, the sound audio signal passes through the wiring cord 5.
It is applied to the speaker unit 2 to generate sound. Speaker
The opening of the unit 2 faces the reflector horn 1.
Sound is generated as shown in FIG.
As shown in A, geometrically exit from the speaker unit 2.
Reflected by the reflector horn 1. Reflector horn
The curved surface of 1 is composed of an ellipsoid, and the two focal points of the ellipsoid
One focus X₁At the position of
By arranging the knit 2, the other focus X _Two Position of
The sound waves are concentrated on the
If the reflector horn 1 is arranged,
You can collect the sound from G2 to the listener.

Further, for low frequency sound having a wavelength about the same as the aperture diameter of the reflector horn 1, the sound emitted from the front surface of the speaker unit 2 and the sound emitted from the rear surface of the speaker unit 2 cancel each other, and the low frequency The sound leakage is eliminated, and the sound is transmitted only under the reflector horn 1.

Next, the conventional directional speaker device shown in FIG. 13 [hereinafter, referred to as a closed rear type] will be described. In the rear open type shown in FIG. 12, the speaker unit 2 is attached to the baffle plate 3 with the rear surface opened, but in the case of the rear closed type shown in FIG. 13, the speaker unit 2 is a small closed box 18. Built into. The closed box 18 is installed inside the reflector horn 1 with a hanging wire 4a.

The voice signal is applied to the speaker unit 2 through the wiring cord 5 to generate a sound. Since the opening of the speaker unit 2 is provided so as to face the reflector horn 1, the generated sound geometrically emerges from the speaker unit 2 and is reflected by the reflector horn 1 as shown by a broken line A in FIG.

The curved surface curve of the reflector horn 1 is formed of an ellipsoid, and one of two foci of the ellipsoid X ₁
If the speaker unit 2 as a sound source is placed at a position and the listener's ears are placed near the other focus position X2, the sound emitted from the speaker unit 2 can be collected at the listening point X2. It is possible to hear the sound under the reflector horn 1, but the sound is considerably attenuated when it is separated from the position of X2, so that it can be heard only by a person in a certain area.

[0011]

However, FIG.
In the case of the open rear surface type shown in Fig. 3, when the low frequency sound wave radiated from the speaker unit 2 is reflected by the reflector horn 1, the reflector horn 1 resonates, so that the reflector horn 1 becomes a sound wave generation source and a low frequency sound leak. Exists and has a problem that the directivity cannot be sharpened to a certain degree or more.

It is an object of the present invention to provide a directional speaker device capable of reducing sound leakage at low frequencies due to resonance of the reflector horn 1 to further sharpen the directivity and transmitting sound only directly under the reflector horn 1. And

In the case of the rear closed type shown in FIG. 13, not all of the sound emitted from the speaker unit ₂ is collected at the focal point X ₂ , but the lower frequency sound is diverged to other than the focal point X ₂ and the reflector. There is a problem that the horn 1 does not have an effect and a person (X _{3 in} FIG. 13) a little apart from a person near the focal point X ₂ of the reflector horn 1 hears it.

Further, as the sharp directivity of the reflector horn 1 becomes more significant as the frequency becomes higher, there is a problem in that the higher the frequency near the focal point X ₂ , the better the sound quality becomes, and the sound quality becomes deviated. FIG. 14 shows the directional characteristics of the conventional directional speaker device shown in FIG.

The present invention realizes a directional speaker device capable of transmitting sound only to a person in a specific area. Another object of the present invention is to provide a directional speaker device capable of preventing the sound quality from being biased to a high frequency at the listening point.

[0016]

In order to achieve the above object, the directional speaker device of the present invention has an opening surface of a speaker unit at one focal point of a reflector horn having a spheroidal shape and a radiation direction of the reflector horn. The speaker unit is arranged so as to face in the opposite direction, the vibrating body is attached to the reflector horn, and the vibrating body is driven to attenuate the vibration of the reflector horn.

With this structure, generation of sound waves due to resonance of the reflector horn is suppressed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The directional speaker device of the present invention is
At one focal point of the spheroidal reflector horn, the speaker unit is arranged so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn, and the vibrating body is attached to the reflector horn, and the vibration is generated. It is characterized by damping the vibration of the reflector horn by driving the body, and when the low frequency sound wave radiated from the speaker unit reflects on the reflector horn, the reflector horn resonates with the vibrating body provided on the reflector horn surface. By braking with the generated vibration, the generation of sound waves from the reflector horn is suppressed.

In order to improve the directivity at low frequencies, a baffle plate is provided at one focal point of the spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. The speaker unit attached to the speaker unit is arranged, and the acoustic tube is attached to the rear surface of the speaker unit. Preferably, specifically, a portion of the reflector horn that faces the baffle plate is formed into a flat surface, an acoustic tube having a non-uniform cross-sectional area is used as the acoustic tube, and the wavelength of the low-frequency resonance frequency is the opening of the reflector horn. A speaker unit having the same diameter as that of the baffle plate is attached.

In this case, when the input signal is a mid-high range signal, the sound emitted from the speaker unit arranged at one focus inside the reflector horn is geometrically similar to the case of the conventional small closed box. The sound gathers at the focus of and the sharp directivity can be realized. For the baffle plate and the acoustic tube, set the diameter and length of the acoustic tube and the diameter of the baffle plate so that appropriate performance as low frequency reproduction characteristics can be achieved, and make sure that the cross-sectional area of the acoustic tube is not constant. , It is possible to prevent significant disturbance of acoustic characteristics from occurring at the assumed listening point on the front axis of the opening of the reflector horn. By setting the wavelength of the low-frequency resonance frequency of the speaker unit to be the same as the aperture diameter of the reflector horn, for the input signal of low frequency that the reflector horn cannot collect sound to the other focal point geometrically. The output of the reproduced sound can be made lower than that of mid-high range. Furthermore, in the above configuration, as the frequency of the input signal to the speaker unit becomes higher, the sound becomes geometrically more likely to gather at the other focal point, and when the focal point is the listening point, the sound pressure becomes higher at a remarkably higher frequency. It becomes very difficult to hear, so by flattening the apex of the reflector horn by the same diameter as the baffle plate to which the speaker unit is attached, when the signal input to the speaker unit has a high frequency, It can be geometrically not focused on the other focus, and can be reflected to the same extent as the apex of a certain reflector horn, so that the sound quality does not deviate to the high frequency at the listening point.

When the input signal is in a low frequency band, the reproduced sound pressure is low because it is lower than the low frequency resonance frequency of the speaker unit used as described above, and the acoustic tube is added to the rear surface of the unit, but the acoustic tube is Since there is no acoustic effect at low frequencies, the sound from the front of the speaker unit and the sound at the rear of the speaker unit cancel each other apart from the other focal point on the front axis of the reflector horn.
Therefore, it is possible to reduce sound leakage to areas other than the front in the low frequency band where the reflector horn cannot realize sharp directional characteristics.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 will be described. It is to be noted that components having the same functions as those of the conventional example shown in FIGS.

[First Embodiment] FIGS. 1 and 2 show the first embodiment.
Embodiment of] is shown. A vibrating body 8 having the structure shown in FIG. 2 is fixed by bolts 9 to the reflector horn 1 that is suspended from the ceiling by a wire 7 connected to a suspending metal fitting 6.

In FIG. 2, a magnetic circuit composed of a top plate 11, a magnet 12 and a bottom plate 13 is attached to a case 10 of the vibrating body 8 while being supported by two suspensions 14. Further, the outer peripheral portion of the diaphragm 16 fixed to the voice coil 15 held in the air gap of the magnetic circuit is also fixed to the case 10.

Further, as in the conventional case, the speaker unit 2 is attached to one focal point of the spheroidal reflector horn 1.
Is attached. In the speaker unit 2, the opening surface is oriented in the direction opposite to the radiation direction of the reflector horn 1,
The rear surface is attached to the baffle plate 3 in an open state. The baffle plate 3 is attached to the reflector horn 1 via three rod-shaped arms 4 in the circumferential direction.

The following voice signals are applied to the speaker unit 2 and the voice coil 15 of the vibrating body 8 via the wiring cord 21. First, a sound audio signal is applied to the speaker unit 2 via the wiring cord 21 to generate a sound. Since the opening of the speaker unit 2 is provided so as to face the reflector horn 1, the sound wave generated from the speaker unit 2 is reflected by the reflector horn 1. By configuring the curved surface curve of the reflector horn 1 with an ellipsoid and disposing the speaker unit 2 as a sound source at one of the two focal points of the ellipsoid,
Since the sound waves are concentrated on the other focus, the sound emitted from the speaker unit 2 can be collected by the listener by arranging the reflector horn 1 so that the listener's ears come near the focus.

Further, for low-frequency sound having a wavelength about the same as the aperture diameter of the reflector horn 1, the sound emitted from the front surface of the speaker unit 2 and the sound emitted from the rear surface thereof cancel each other out, and the low frequency Consideration is given to reduce sound leakage.

However, since the reflector horn 1 resonates when the low-frequency sound wave radiated from the speaker unit 2 is reflected by the reflector horn 1, in the present embodiment, the vibrating body 8 has a sound signal applied to the speaker unit 2. An audio signal having the opposite phase is applied, and by vibrating the reflector horn 1 by the vibrating body 8, the above resonance of the reflector horn 1 can be damped.

Specifically, the voice coil 15 of the vibrating body 8
When an audio signal is applied to the magnetic circuit, the magnetic circuit oscillates under the force of the magnetic field in the air gap of the magnetic circuit according to Fleming's left-hand rule. The magnetic circuit has two suspensions 1 in the case 10.
Since it is supported by 4, the reflector horn 1 vibrates by transmitting the vibration to the case 10. The vibrating body 8 is fixed to the reflector horn 1 by bolts 9, and since it has a high mechanical impedance, it operates as a low-pass filter and transmits only low-frequency vibrations.
The resonance due to the reflection of the reflector horn 1 can be damped without passing a low-pass filter on the audio signal applied to the vibrating body 8.

FIG. 3A shows the frequency characteristic of the directional speaker device of this embodiment, and FIG. 3B shows the frequency characteristic of the conventional directional speaker device. In addition, in all cases, the opening diameter of the reflector horn 1 is 700 mm. 0 °, 30 °, and 60 ° in the figure represent angles from the central axis of the speaker unit 2, and the distance to the microphone is the distance from the center of the speaker unit 2 to one focus of the spheroid of the reflector horn 1. did.

As shown in FIG. 3, the sound pressure on the central axis near 500 Hz decreases, but the attenuation of the sound pressure is 60 dB in the 30 ° characteristic and 8 dB in the 60 ° characteristic.
An effect of 18 dB was obtained with respect to 5 dB.

[Second Embodiment] FIG. 4 shows a second embodiment. In the [first embodiment], the vibrating body 8 is directly attached to the reflector horn 1 with the bolts 9, but in the [second embodiment], the vibrating body 8 is more than the surface area of the vibrating body 8. It is fixed to a large baffle plate 17, and only the point that the vibrating body 8 is fixed to the reflector horn 1 by the bolt 9 via the baffle plate 17 [first
Embodiment of the present invention].

As described above, by interposing the baffle plate 17 larger than the surface area of the vibrating body 8 with the reflector horn 1, the amplitude of the vibrating body 8 can be increased. Therefore, when the low-frequency sound wave emitted from the speaker unit 2 is reflected by the reflector horn 1, the reflector horn 1 that resonates can be more significantly damped, and 50
The directivity near 0 Hz can be made sharper.

[Third Embodiment] FIG. 5 shows a third embodiment. The speaker unit 2 arranged at the focal point X ₁ of the reflector horn 1a is attached to the baffle plate 3, and the acoustic tube 19 is added to the rear surface thereof. This cross section is squeezed at the center of the tube so that the cross-sectional area is not uniform. Further, a portion of the apex of the reflector horn 1a facing the baffle plate 3 is formed into a flat surface 20 having a diameter similar to that of the baffle plate 3.

The speaker unit 2 mounted on the baffle plate 3 has a low resonance frequency wavelength equal to the aperture diameter of the reflector horn 1a. The operation of the directional speaker device configured as described above will be described below.

Speaker unit 2 in which the input signal is used
Is higher than the low-frequency resonance frequency of the speaker, that is, the wavelength is shorter than the aperture diameter of the reflector horn 1a, the speaker unit 2
Since the opening is provided so as to face the reflector horn 1a, the generated sound geometrically emerges from the speaker unit 2 and is reflected by the reflector horn 1a as shown by a broken line A in FIG.

Since the curved surface curve of the reflector horn 1a is composed of a substantially spheroid and the speaker unit 3 as the sound source is arranged at the position of _one focus X ₁ of the two foci of the ellipsoid, It is possible to collect sound at one focus X ₂ [listening point], and even if it can be heard just below the reflector horn 1a, the sound is considerably attenuated if it is separated from the position of the listening point X ₂ , so it is in a certain area. Can only be heard by people.

The speaker unit 2 is attached to the baffle plate 3, and the acoustic tube 1 is provided on the rear surface of the speaker unit 2.
Since 9 is added, it is possible to reproduce up to a frequency band lower than that of the small closed box 18 having the same size as the opening diameter of the speaker unit 2.

Since the central portion of the acoustic tube 19 is formed so as not to have a constant sectional area, the acoustic tube 19 has a sharp increase in acoustic output at a specific frequency due to resonance by the acoustic tube 19 at the listening point X ₂ . As a result, it is possible to prevent deterioration of sound quality at the listening point.

Even when the signal input to the speaker unit 2 has a high frequency, since the apex of the reflector horn 1a is formed on the plane 20, the sound is geometrically at the listening point X ₂ . The sound quality at the listening point X ₂ is not biased to a high frequency because the sound quality can be reflected to the same extent as the apex of the reflector horn without gathering.

Speaker unit 2 in which the input signal is used
If the wavelength is lower than the low resonance frequency of the reflector horn 1a, that is, if the wavelength is longer than the opening diameter of the reflector horn 1a, the reproduction sound pressure is low because the resonance frequency is lower than the low resonance frequency of the speaker unit 2 used as described above. Although the sound tube 19 is added to the sound tube 19, since the sound tube 19 has no acoustic effect at a low frequency, the sound from the front surface of the speaker unit 2 and the sound on the rear surface of the speaker unit 2 are on the front axis of the reflector horn 1. Cancel each other away from the other focal point. Therefore, it is possible to reduce the sound leakage to areas other than the front in the low frequency band where the reflector horn 1 cannot realize sharp directional characteristics. FIG. 6 shows the directional characteristics of the directional speaker device of [Third Embodiment] shown in FIG.

FIG. 7A shows the constituents of the [third embodiment] shown in FIG. 5, FIG. 7B shows FIG. 6, and FIG. 15A. FIG. 15 is a diagram showing the constitutional requirements of the conventional rear surface closed type shown in FIG.
Represents FIG. 14.

[Fourth Embodiment] FIGS. 8A and 8B.
Indicates [fourth embodiment]. [Third Embodiment]
The constituent requirements of are a reflector horn 1a having a flat surface 20 formed at the apex, a rear open speaker unit 2 attached to the baffle plate 3, and an acoustic tube 19 attached to the rear surface of the speaker unit 2 and having an uneven cross section. However, in this [fourth embodiment], as shown in FIG. 8 (a), the reflector horn 1 having no flat surface 20 formed at its apex and the rear surface attached to the baffle plate 3 Open speaker unit 2 and speaker unit 2
The acoustic tube 19a is attached to the rear surface of the acoustic tube 19a and has a uniform cross section. With this configuration, the directional characteristics shown in FIG. 8B are obtained.

Comparing the directivity characteristic of FIG. 8B with the directivity characteristic of FIG. 15B, [fourth embodiment]
In comparison with the conventional example, by providing an acoustic tube with an open rear surface, some peaks and dips due to resonance of the acoustic tube can be seen in the middle and high ranges, but the directional characteristics in the low range are improved, It can eliminate sound leakage in the low range.

[Fifth Embodiment] FIGS. 9A and 9B.
Indicates [Fifth Embodiment]. In this [fifth embodiment], as shown in FIG. 9A, the speaker unit 2 whose rear surface is attached to the baffle plate 3 is sealed by a hermetically sealed box 18, and the baffle plate 3 is provided at the top. It is composed of a reflector horn 1a having a flat surface 20 formed to some extent. With such a structure, a directional characteristic as shown in FIG. 9 (b) was obtained.

A comparison between the directivity characteristics of FIG. 9B and the directivity characteristics of FIG. 15B shows a fifth embodiment.
As compared with the conventional example, the sound was converged as it became higher, and the characteristics became flat in the band above the low range, and the deterioration (high rise) of the sound quality at the listening point was improved.

[Sixth Embodiment] FIG. 10A
(B) shows [Sixth Embodiment]. In this [sixth embodiment], as shown in FIG. 10A, a reflector horn 1 in which a flat surface 20 is not formed at the apex,
The open rear type speaker unit 2 attached to the baffle plate 3 and the acoustic tube 19 attached to the rear face of the speaker unit 2 and having a non-uniform cross section. The directional characteristics as shown in b) were obtained.

A comparison between the directivity characteristics of FIG. 10B and the directivity characteristics of FIG. 15B shows the sixth embodiment.
In comparison with the conventional example, the directivity characteristic in the low frequency range is improved and the sound leakage in the low frequency range can be eliminated in the same manner as the directivity characteristic shown in FIG. 10B of the fourth embodiment. , The peak and dip at the listening point due to the resonance of the acoustic tube can be eliminated, and the characteristics in the mid range and high range can be made flat.

[Seventh Embodiment] FIG. 11A
(B) shows [7th Embodiment]. In this [seventh embodiment], as shown in FIG. 11A, a reflector horn 1 in which a flat surface 20 is not formed at the apex,
The rear surface attached to the baffle plate 3 has a closed box 18
And a speaker unit 2 that is sealed with a speaker unit 2, and the wavelength of the low resonance frequency of the speaker unit 2 is the same as the opening diameter of the reflector horn 1.
Is attached to the baffle plate 3, and a directional characteristic as shown in FIG. 11B is obtained.

Comparing the directivity characteristic of FIG. 11B with the directivity characteristic of FIG. 15B, the seventh embodiment will be described.
Then, as compared with the conventional example, as shown by the broken line B in FIG. 11B, in the low frequency band that cannot be converged by the reflector horn 1, the wavelength of the low frequency resonance frequency is set to be the same as the aperture diameter of the reflector horn 1. Since it is not played back, the sound leakage in the low range can be eliminated.

[0051]

As described above, according to the present invention, the speaker unit is arranged at one focal point of the spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. It is characterized in that a vibrating body is attached to the reflector horn, and the vibrating body is driven to damp the vibration of the reflector horn, and when the low frequency sound wave emitted from the speaker unit is reflected by the reflector horn, the reflector horn By damping the resonating motion with the vibration generated by the vibrating body provided on the reflector horn surface, the directivity of the low frequency can be further sharpened, and as a result, the low frequency sound leakage is reduced and the reflector horn Sound can be transmitted only underneath.

Further, a speaker unit attached to a baffle plate is arranged at one focal point of the spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. By attaching an acoustic tube to the rear surface of the unit, the sound in front of the speaker unit and the sound in the back of the speaker unit cancel each other out, and directivity in the low range can be obtained, and sound leakage in the low range can be improved.

Further, a speaker unit mounted on a baffle plate is arranged at one focal point of the spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. By forming the portion of the horn facing the baffle plate to be a flat surface, it is possible to improve the middle- and high-range sound quality at the listening point.

In the fifth and sixth aspects, by incorporating the speaker unit in the closed box, it is possible to improve sound leakage in the low range and sound quality in the middle and high ranges at the listening point.

Further, in the present invention, by using an acoustic tube having a non-uniform cross-sectional area, it is possible to improve the sound leakage in the low range and the sound quality in the middle and high ranges at the listening point. Further, at one focal point of the spheroidal reflector horn, a speaker unit attached to a baffle plate is arranged so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn, and the rear surface of the speaker unit is arranged. A speaker unit in which an acoustic tube having a non-uniform cross-sectional area is attached to the reflector horn, and a portion of the reflector horn facing the baffle plate is formed into a flat surface so that the wavelength of the low resonance frequency is the same as the aperture diameter of the reflector horn. It is possible to obtain good results by improving the sound leakage in the low frequency range and the sound quality in the middle and high frequency range at the listening point by using the sound sensor attached to the baffle plate.

[Brief description of drawings]

FIG. 1 is a sectional view of a directional speaker device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the vibrating body.

FIG. 3 is a frequency characteristic diagram of the same directional speaker device and a frequency characteristic diagram of a conventional product.

FIG. 4 is a sectional view of a directional speaker device according to a second embodiment.

FIG. 5 is a sectional view of a directional speaker device according to a third embodiment.

FIG. 6 is a directional characteristic diagram of [Third Embodiment].

FIG. 7 is a schematic configuration diagram and directional characteristic diagram of [Third Embodiment].

FIG. 8 is a schematic configuration diagram and directional characteristic diagram of [Fourth Embodiment].

FIG. 9 is a schematic configuration diagram and directional characteristic diagram of [Fifth Embodiment].

FIG. 10 is a schematic configuration diagram and directional characteristic diagram of [Sixth Embodiment].

FIG. 11 is a schematic configuration diagram and directional characteristic diagram of [Seventh Embodiment].

FIG. 12 is a cross-sectional view of a conventional directional speaker device.

FIG. 13 is a sectional view of a conventional directional speaker device.

FIG. 14 is a directional characteristic diagram of the conventional directional speaker device shown in FIG.

FIG. 15 is a schematic configuration diagram and directional characteristic diagram of a conventional directional speaker.

[Explanation of symbols] 1 reflector horn 1a reflector horn with a flat top portion 2 speaker unit 3 baffle plate 4 arm 4a suspension wire 8 vibrating body 17 baffle plate larger than the surface area of the vibrating body 19 cross-sectional area is not uniform Acoustic tube 19a Acoustic tube with a uniform cross-sectional area 20 Plane of the apex of the reflector horn

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Ono 7-10-15 Oyama, Shinagawa-ku, Tokyo

Claims (9)

[Claims] 1. A speaker unit is disposed at one focal point of a spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn, and a vibrator is attached to the reflector horn. A directional speaker device that is attached and drives the vibrating body to damp the vibration of a reflector horn. 2. The directional speaker device according to claim 1, wherein the vibrating body is mounted on the surface of the reflector horn via a baffle plate larger than the surface area of the vibrating body. 3. The speaker unit attached to one of the focal points of the reflector horn and the vibrator provided on the reflector horn are configured to simultaneously receive audio signals whose phases are mutually inverted. The directional speaker device described. 4. A speaker unit attached to a baffle plate is arranged at one focal point of a spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. Directional speaker device with an acoustic tube attached to the rear surface. 5. A reflector unit mounted on a baffle plate is arranged at one focal point of a spheroidal reflector horn so that an opening surface of the speaker unit is directed in a direction opposite to a radiation direction of the reflector horn. 1. A directional speaker device in which a portion facing the baffle plate is formed into a flat surface. 6. The directional speaker device according to claim 5, wherein the speaker unit is incorporated in a closed box. 7. The directional speaker device according to claim 4, wherein an acoustic tube whose cross-sectional area is not uniform is used as the acoustic tube. 8. A speaker unit mounted on a baffle plate is arranged at one focal point of a spheroidal reflector horn so that the opening surface of the speaker unit faces the direction opposite to the radiation direction of the reflector horn. A directional speaker device in which an acoustic tube having a non-uniform cross-sectional area is attached to a rear surface thereof, and a portion of the reflector horn facing the baffle plate is formed into a flat surface. 9. The directional speaker device according to claim 4, wherein the baffle plate is provided with a speaker unit having a low resonance frequency wavelength equal to the aperture diameter of the reflector horn.