JPH08331683A - Horn speaker system - Google Patents

Abstract

PURPOSE: To obtain an acoustic reproduction in which the disturbance of a sound pressure frequency characteristic is a little by forming a system into the shape gradually reducing the cross section perpendicular to the propagation direction of the sound wave from a driver acoustic radiation surface and a horn input part controlling the directional angle of a horizontal direction. CONSTITUTION: In a horn 4 controlling the directional angle in a horizontal direction, the horizontal section passing a center axis 17 is composed of curves 10 and 11 and curves 12 and 13. In a horn 3 controlling the directional angle in a vertical direction, the vertical section passing the center axis 17 is composed of curves 6 and 7 and curves 8 and 9. The horn 3 becomes longer than the horn 4. The acoustic radiation surface 2 of the driver 1 and a horn input part 5 are connected by curves 14 and 15, and the distance between the curves 14 and 15 and the center axis 17 is reduced in proportion to the distance from the acoustic radiation surface 2. As a result, the cross section pependicular to the propagation direction of a sound wave gradually changes, the frequency change of an acoustic impedance is reduced and the disturbance of a sound pressure frequency characteristic is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horn speaker system using a horn.

[0002]

2. Description of the Related Art In recent years, a horn speaker system having a controlled directional angle has been used to control a sound field in a medium-sized or large-scale hall. Hereinafter, a conventional horn speaker system will be described with reference to the drawings.

FIG. 3 is a sectional view of a conventional horn speaker system having different horizontal and vertical directional angles.

In FIG. 3, (a) shows the vertical cross section of the speaker, and (b) shows the horizontal cross section of the speaker.
1 is a driver, 32 is a sound emitting surface of the driver, 33
Is a horn for controlling the vertical directional angle, 34 is a horn for controlling the horizontal directional angle, 35 is a horn input section for controlling the horizontal directional angle, 36 is a horn opening, 37 is a central axis, and 38 is The inverted conical horns 39 and 40 are straight walls.

Generally, the narrower the directional angle, the longer the horn length. Therefore, when the vertical directional angle is narrower than the horizontal directional angle, the horn 34 for determining the horizontal directional angle determines the vertical directional angle. It is shorter than the horn 33 to be determined. The shape of the wall surface that guides sound waves from the sound emitting surface 32 of the driver to the horn input unit 35 that controls the horizontal directional angle controls the horizontal directional angle in the high frequency band. Must reduce the distance from the central axis 37 of the horizontal section of the horn input section 35 that controls the horizontal directivity angle.

Therefore, as shown in FIG. 3A, the sound emitting surface 32 of the driver and the horn input portion 35 for controlling the horizontal directivity angle are connected to each other by the steep inverse conical horn 38 and the straight walls 39 and 40, and the horizontal direction. Distance from the central axis 37 of the horizontal section of the horn input section 35 for aligning the horn opening section 36 of the horn 34 for determining the directivity angle of the horn and the horn opening section 36 of the horn 33 for determining the directivity angle of the vertical direction and for controlling the directivity angle in the horizontal direction. Is small.

In the horn loudspeaker system having such a configuration, the sound wave reproduced by the driver 31 is controlled from the acoustic emission surface 32 of the driver by the conical conical horn 38 and the straight walls 39 and 40 to control the horizontal directivity angle. 35, and the directional angle in the horizontal direction is controlled by the horn 34 that controls the directional angle in the horizontal direction.
It is radiated to the outside from the horn opening 36.

[0008]

However, in the above-mentioned conventional horn speaker system, since the cross-sectional area of the inverted conical horn 38 which is perpendicular to the traveling direction of the sound wave is sharply changed, the frequency change of the acoustic impedance becomes large. As a result, the sound pressure frequency characteristic is disturbed, and the acoustic characteristic is impaired.

In view of the above problems, it is an object of the present invention to provide a horn speaker system having a shape in which the disturbance of the sound pressure frequency characteristic is unlikely to occur.

[0010]

In order to achieve the above object, a horn speaker system of the present invention comprises a driver for acoustically converting an electric signal, and a horizontal target directivity angle attached to the acoustic radiation surface of the driver. (Θ _H ) and a target directional angle (θ _V ) in the vertical direction (θ _H > θ _V ) are provided in a different relationship, and a vertical cross section passing through the central axis of the horn is A first curve and a second curve which are connected at one end and face each other, and the other end and one end of the first curve and the second curve are respectively connected, and the other end is connected to the acoustic radiation surface of the driver. And a third curve and a fourth curve that face each other, and the connection point (a) of the first curve and the third curve and the connection point of the second curve and the fourth curve. Each distance from the central axis of (b) is It becomes 0.3 to 0.7 times the distance between the vertical section and the central axis through the central axis of the over down opening, the first
And the distance Y from the central axis of the curve and the second curve is represented by the following (Equation 5),

[0011]

(Equation 5)

The distance Y from the central axis of the third curve and the fourth curve is represented by the following (Equation 6),

[0013]

(Equation 6)

The horizontal cross section passing through the central axis of the horn has a fifth curve and a sixth curve, one end of which is connected to the horn opening and which faces each other, and the fifth curve and the sixth curve. A seventh curve and an eighth curve, which are connected to each other at one end and one end and face each other, and the other end and one end of the seventh curve and the eighth curve are respectively connected to each other, and the other end is an acoustic radiation surface of the driver. 9th curve and 10th curve which are connected and face each other
And the connecting points (c) of the fifth curve and the seventh curve, and the connecting points (d) of the sixth curve and the eighth curve from the central axes, respectively. 0.3 of the distance between the horizontal axis passing through the central axis of the horn opening and the central axis
.About.0.7 times, and the distances from the central axes of the connection points (e) of the seventh curve and the ninth curve and the connection points (f) of the eighth curve and the tenth curve, respectively. Is greater than 0, the distance Y from the central axis of the fifth curve and the sixth curve is represented by the following (Equation 7),

[0015]

(Equation 7)

The distance Y from the central axis of the seventh curve and the eighth curve is represented by the following (Equation 8),

[0017]

(Equation 8)

It is characterized in that the distances from the central axes of the ninth curve and the tenth curve are gradually reduced with increasing distance from the acoustic radiation surface of the driver.

[0019]

According to the present invention, with the above-described structure, the wall shape that guides the sound wave from the driver output section to the horn input section is gradually reduced in the distance between the central axis and the wall surface toward the horn input section, and the cross-sectional area changes sharply. Since it is configured so as not to become, it is possible to realize good sound reproduction with less disturbance of the sound pressure frequency characteristics.

[0020]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a structural sectional view of a horn speaker system according to an embodiment of the present invention.

In FIG. 1, (a) shows the vertical cross section of the speaker and (b) shows the horizontal cross section of the speaker.
Is a driver, 2 is a sound emitting surface of the driver, 3 is a horn that controls a vertical directional angle, 4 is a horn that controls a horizontal directional angle, 5 is a horn input unit that controls a horizontal directional angle, and 6 Is the first curve, 7 is the second curve, 8 is the third curve, 9 is the fourth curve, 10 is the fifth curve, 11 is the sixth curve, 12 is the seventh curve, 13 is 8th curve, 1
Reference numeral 4 is a ninth curve, 15 is a tenth curve, 16 is a horn opening, and 17 is a central axis.

The central axis 17 of the first curve 6 and the second curve 7
The distance Y from is represented by the following (Equation 9).

[0024]

[Equation 9]

Further, the distances from the central axes of the third curve 8 and the fourth curve 9 are expressed by the following (Equation 10).

[0026]

[Equation 10]

The distance from the central axis 17 of the fifth curve 10 and the sixth curve 11 is expressed by the following (Equation 11),

[0028]

[Equation 11]

The distances from the central axes of the seventh curve 12 and the eighth curve 13 are expressed by the following (Equation 12).

[0030]

(Equation 12)

Generally, the narrower the directivity angle, the longer the horn length. Therefore, the horizontal section passing through the central axis 17 has the fifth curve 10 and the sixth curve 11 expressed by the above-mentioned (Equation 11), and In the horn 4 configured by the seventh curve 12 and the eighth curve 13 represented by (Equation 12) for controlling the horizontal directivity angle, the vertical section passing through the central axis 17 is represented by (Equation 9). From the horn 3 for controlling the vertical directivity angle, which is composed of the first curve 6 and the second curve 7 and the third curve 8 and the fourth curve 9 represented by (Equation 10). The length is shortened, and the sound emitting surface 2 of the driver and the horn input unit 5 for controlling the horizontal directivity angle are connected by a ninth curve 14 and a tenth curve 15. In this embodiment, the distances from the central axis 17 of the ninth curve 14 and the tenth curve 15 are the maximum of the sound emitting surface 2 of the driver, and the sound emitting surface 2 of the driver is
In the horn input unit 5 that controls the horizontal directivity angle by reducing in proportion to the distance from, the distance between the central axis 17 of the ninth curve 14 and the tenth curve 15 is minimized. Has become.

In the horn speaker system configured as described above, the change amount of the cross-sectional area perpendicular to the traveling direction of the sound wave is
Since it gradually changes from the sound emitting surface 2 of the driver toward the horn input unit 5 that controls the horizontal directivity angle, the frequency change of the acoustic impedance is small and the sound pressure frequency characteristic is not disturbed.

In this embodiment, the distance between the ninth curve 14 and the tenth curve 15 from the central axis 17 is the maximum on the acoustic radiation surface 2 of the driver, and the horn input controls the horizontal directivity angle. The smallest in part 5, always the 9th curve 1
The fourth and tenth curves 15 have an inverted conical horn shape in which the distance from the central axis 17 is reduced in proportion to the distance from the sound emitting surface 2 of the driver.
To the horn input section 5 for controlling the directivity angle in the horizontal direction, the change amount of the sectional area perpendicular to the central axis 17 causes the coefficient T to be 0, 0.5, 1,
The 9th curve 14
Even if the distance between the center line 17 and the tenth curve 15 is set, the same effect can be obtained.

[0034]

(Equation 13)

FIG. 2 is a simulation result of the sound pressure frequency characteristics of the horn speaker system in which the horizontal directional angle and the vertical directional angle are different in the present invention and the conventional example. 20 has a driver acoustic emission surface 32 with a diameter of 42.6.
mm, the diameter of the horn input part 36 for controlling the horizontal directivity angle is 18 mm, the length of the reverse conical horn 39 is 70 mm, the lengths of the straight walls 39 and 40 are 330 mm, and the horn opening 3
The results of a conventional horn speaker system in which the diameter of 6 is 580 mm are shown. On the other hand, 21 has a diameter of the sound emitting surface 2 of the driver of 42.6 mm, the diameter of the horn input section 5 for controlling the horizontal directivity angle is 18 mm, the ninth curve 14 and the first curve.
The result of the horn speaker system of the present invention in which the length of the curve 15 of 0 is 400 mm along the central axis 17 and the diameter of the horn opening 16 is 580 mm is shown. It can be seen that the dips of 0.6 and 1.2 kHz are improved and the present invention is excellent in that the disturbance of the sound pressure frequency characteristic is small.

[0036]

As described above, according to the present invention, the cross-sectional area perpendicular to the traveling direction of the sound wave from the driver sound emitting surface to the horn input section for controlling the horizontal directivity angle is gradually reduced. As a result, it is possible to provide a horn speaker system capable of obtaining excellent sound reproduction with less disturbance of sound pressure frequency characteristics.

[Brief description of drawings]

1A is a horizontal sectional view of a horn speaker system according to an embodiment of the present invention, and FIG. 1B is a vertical sectional view of a horn speaker system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a simulation result of sound pressure frequency characteristics of a horn speaker system having different horizontal and vertical directional angles.

FIG. 3A is a horizontal sectional view of a conventional horn speaker system having different horizontal and vertical directional angles. FIG. 3B is a conventional horn speaker system having different horizontal and vertical directional angles. Vertical cross section

[Explanation of symbols]

 1 Driver 2 Acoustic emission surface of driver 3 Horn for controlling directivity angle in vertical direction 4 Horn for controlling directivity angle in horizontal direction 5 Horn input section for controlling directivity angle in horizontal direction 6 First curve 7 Second curve 8 3rd curve 9 4th curve 10 5th curve 11 6th curve 12 7th curve 13 8th curve 14 9th curve 15 10th curve 16 Horn opening 17 Center axis a 1st The junction of the curve and the third curve b The junction of the second curve and the fourth curve c The junction of the fifth curve and the seventh curve d The junction of the sixth curve and the eighth curve e Junction point of seventh curve and ninth curve f Junction point of eighth curve and tenth curve

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shuji Saeki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A driver for acoustically converting an electric signal, a horizontal target directivity angle (θ _H ) and a vertical target directivity angle (θ _V ) which are mounted on an acoustic radiation surface of the driver.
(Where θ _H > θ _V ) have different relations, and a vertical cross section passing through the central axis of the horn has a first curve and a second curve that are connected to the horn opening at one end and face each other. And a third curve and a fourth curve which are connected to each other at the other end and one end of the first curve and the second curve, and are connected at the other end to the acoustic radiation surface of the driver to face each other. Therefore, the respective distances from the central axis of the connection point (a) of the first curve and the third curve and the connection point (b) of the second curve and the fourth curve are the horns. 0.3 of the distance between the central axis and the vertical section passing through the central axis of the opening
.About.0.7 times, and the distance Y from the central axis of the first curve and the second curve is represented by the following (Equation 1): Distance Y from the central axes of the third curve and the fourth curve
Is represented by the following (Equation 2), and A horizontal section passing through the central axis of the horn has a fifth curve and a sixth curve which are connected to the horn opening at one end thereof and face each other, and the other ends of the fifth curve and the sixth curve are opposite to each other. And the other ends of the seventh curve and the eighth curve, the other ends and the other ends of the seventh curve and the eighth curve, respectively, and the other end of the seventh curve and the eighth curve, which are connected to the acoustic radiation surface of the driver. It is composed of a ninth curve and a tenth curve facing each other, and a connection point (c) of the fifth curve and the seventh curve, and a connection point (d of the sixth curve and the eighth curve. ) The distance from each center axis is 0.3 to 0.7 times the distance between the center axis and the horizontal section passing through the center axis of the horn opening,
The connecting points (e) of the seventh curve and the ninth curve and the connecting points (f) of the eighth curve and the tenth curve are greater than 0 from the central axis, respectively, and The distance Y from the central axis of the curve 5 and the sixth curve is as follows (Equation 3)
It is represented by Distance Y from the central axes of the seventh curve and the eighth curve
Is expressed by the following (Equation 4), and A horn loudspeaker system, wherein the distances from the central axes of the ninth curve and the tenth curve gradually decrease with increasing distance from the acoustic radiation surface of the driver.