JPH0543692U - A diffuser that improves the directional characteristics of the speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate the directivity of the sound that the mid- and high-range speakers have, to reproduce a sound close to a live performance, and to obtain a stereo effect regardless of the position. [Structure] A pair of rectangular diffusion plates 2 having a gap 8 at the base thereof and supporting members 3 so as to spread outward in a V-shaped cross section.
To the front of the speaker via. The sound from the speaker hits the diffuser plate 2 and is reflected and diffused to the side,
It passes through the gap 8 and spreads forward. By adjusting the angle of the diffusing plate 2, it is possible to adjust the degree of spread of the sound, and by adjusting the gap amount, it is possible to arbitrarily adjust the ratio of the sound that travels straight and the sound that reflects and diffuses. The diffuser plate may be formed in an inverted funnel shape or a conical shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diffuser for improving the directional characteristics of a speaker, particularly a speaker for middle and high frequencies.

[0002]

[Prior Art]

 The sound wave emitted from the speaker spreads spherically when the frequency is low, but as the frequency increases, it is concentrated only on the front of the speaker and does not spread to the surroundings. Figure 6 shows an example of the directional pattern of a commercially available model. As the frequency increases, the sound pressure level drops sharply as it goes off the front axis (0 °). It turns out that I can hardly reach. And as the directivity becomes stronger, the indirect sound reflected in the room is less likely to enter, and the only sound coming into the ears of the person in front of the speaker is the direct sound from the speaker, compared to live performance. It becomes a jarring, sharp and gritty, unpleasant sound. In addition, if the directivity is strong, the sound is concentrated only in one place, and the balance of the sound quality becomes poor, and in stereo performance, the stereo effect is significantly different depending on the position, and the position where the stereo effect can be obtained is very limited. Be done. Therefore, it is said that the conventional cone-type speaker can obtain a sound of almost uniform intensity up to about 60 degrees from the center of the speaker.

[0003]

[Problems to be solved by the device]

 The present invention is intended to solve the above-mentioned problems of the conventional mid- and high-range speakers, eliminates the directivity of the sound, reproduces a sound close to a live performance, and has a stereo effect at any position. The purpose is to obtain a diffuser plate for the obtained speaker.

[0004]

[Means for Solving the Problems]

 The above problem is a diffuser for improving the directional characteristics of the speaker of the present invention, which is installed in front of the speaker and diffuses sound to improve the directional characteristics of the speaker. The problem could be solved by adopting a structure characterized in that the diffuser plate is attached to the support member so as to have a linear gap at the base and spread outward in a V-shaped cross section. In addition, the above-mentioned problem is that the diffuser plate is formed in the shape of an inverted funnel that has an opening in the center and spreads outwardly in a conical shape, and the opening of the diffuser plate is located on the center line of the speaker and can be mounted. A support member for supporting the diffuser plate, or a conical diffuser plate, and a support for supporting the diffuser plate so that the apex of the diffuser plate can be mounted at the center line of the speaker. The problem can also be solved by adopting a configuration composed of a member.

[0005]

[Action]

 By installing the diffuser on the baffle plate of the speaker so that the center of the gap of the diffuser is located on the center axis of the speaker, the sound from the speaker hits the back surface of the diffuser and is reflected and diffused to the side. At the same time, it passes through the central gap and spreads forward. At that time, the spread of sound can be adjusted by adjusting the angle of the diffusion plate, and the ratio of the sound traveling straight and the sound reflected and diffused can be adjusted arbitrarily by adjusting the gap amount. Optimal conditions can be set according to the situation. Therefore, the directivity of the sound is eliminated and the sound becomes non-directional, and a sound close to a live performance is obtained. And you can get the stereo effect anywhere by just placing the speakers on the left and right, and there is no need to select the listening position unlike the conventional stereo system. Similarly, in the case of the structure according to claim 2, since the diffuser plate has an inverted funnel shape, sound is reflected on the entire circumference and goes straight forward through the opening. In the case of claim 3, since the diffuser plate has a conical shape, all the sound is reflected by the conical surface and spreads over the entire circumference. Therefore, in that case, it is suitable when the speaker is installed facing upward.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of a diffuser for improving the directional characteristics of a speaker according to the present invention. In the figure, reference numeral 1 denotes a diffuser, which comprises a diffuser plate 2 and a support member 3 which supports the diffuser plate and is attached to the front surface of the speaker. The support member 3 is composed of a pair of angle members as shown in the drawing, and a long hole 5 for adjusting the diffusion plate attachment is formed in the rising portion of the angle members. The diffuser plate 2 is formed of a pair of rectangular plates having a width equal to or longer than the wavelength of sound, and mounting bolts 7 are projectingly provided on the side surfaces thereof. By tightening it, it is possible to mount it so as to face the support member so that it has a linear gap 8 at the base and spreads outward in a V-shaped cross section. In the diffuser plate, the width of the gap 8 can be adjusted by moving the attachment bolt 7 along the attachment adjustment long hole 5, and by rotating the diffusion plate 2 with the attachment adjustment bolt as a fulcrum, The angle can be adjusted freely. The width of the diffusion plate may be equal to or longer than the wavelength length.

As shown in the figure, the diffuser 1 for improving the directional characteristics of the speaker configured as described above is provided on the baffle plate 11 of the speaker 10, and the center of the gap 8 is located on the center axis of the speaker. Install and use as you do. As a result, as shown in FIG. 2, the sound generated by the speaker hits the back surface of the diffuser plate 2 and is reflected and diffused laterally, and at the same time, passes through the central gap 8 and spreads forward. At this time, the degree of sound spread can be adjusted by adjusting the angle of the diffusion plate 2. In addition, by adjusting the gap amount, the ratio of the sound traveling straight and the sound diffusing by reflection can be adjusted arbitrarily. Therefore, if the speakers are installed so that the gap extends along the vertical direction, the sound is diffused in all areas except the vertical direction, the directivity is eliminated and the sound becomes omnidirectional, and a sound close to a live performance is obtained.

3 and 4 show a second embodiment of the present invention. The diffuser 19 of this embodiment is characterized in that the diffuser plate is formed in an inverted funnel shape. In the figure, reference numeral 20 denotes a diffusion plate, which is formed in an inverted funnel shape as shown in the drawing, has an opening 21 in the central portion, is supported by a supporting member 23, and is attached to the cabinet 24 of the speaker 22 as shown in the drawing. Install it so that the center of the gap is located on the center axis of the speaker. As a result, the sound is reflected by the diffuser plate 20 over the entire circumference, goes straight from the opening and spreads forward, and even if the sound has a high frequency, a sound with the same sound pressure is obtained at equal distances in the front, rear, left, and right. Be done. In this embodiment, the inclination angle of the reverse funnel is set to 45 ° so that the sound is reflected at a right angle. However, the ratio of the sound traveling straight and the sound spreading, and the spread of the expanding sound satisfy the desired conditions. By setting the opening amount and the funnel tilt angle so as to satisfy the condition, the best sound according to the situation can be reproduced. It should be noted that in the speaker shown in the figure, bass sounds are emitted from the bottom opening of the cabinet 24.

FIG. 5 shows a spreader 30 according to a third embodiment of the present invention, which is suitable for mounting a speaker facing upward. In this embodiment, the diffuser plate 31 is formed in a completely conical shape without providing an opening so that the sound from the speaker 33 can be totally reflected by the conical surface as shown by the arrow in the figure. There is. In addition, 32 is a support member.

[0010]

[Effect of the device]

 The present invention is configured as described above and has the following special effects. The sound from the speaker hits the back surface of the diffuser plate, is reflected and spreads laterally, diffuses, and spreads forward through the gap in the center. The sound is similar to a live performance. Stereo effects can be obtained by simply placing the speakers on the left and right, and there is no need to select the listening position unlike the conventional stereo method. It has a simple configuration, can be easily attached to conventional speakers, and is inexpensive.

[Brief description of drawings]

1 shows a first embodiment of a diffuser for improving the directional characteristics of a speaker according to the present invention, (a) is a side view in a state where it is attached to the speaker, (b) is a front view, and (c) is It is a top view.

FIG. 2 is an explanatory diagram showing a sound diffusion state.

FIG. 3 is a plan view showing a state in which the speaker is attached to a speaker according to a second embodiment of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a front view of the speaker according to the third embodiment of the present invention when attached to the speaker.

FIG. 6 is a diagram showing a directional pattern of a conventional tweeter.

[Explanation of symbols]

1, 19, 30 Diffuser 2, 20, 31
Diffusion plate 3, 23, 32 Support member 8 Gap 21 Opening 10, 22, 33
speaker

Claims (3)

[Scope of utility model registration request] 1. A diffuser installed in front of a speaker for diffusing sound to improve the directional characteristics of the speaker, comprising a pair of rectangular diffuser plates having a linear gap at the base. A diffuser for improving the directional characteristics of a speaker, characterized in that it is attached to a support member so as to spread outward in a V-shaped cross section. 2. A diffuser installed in front of a speaker to improve the directional characteristics of the speaker for diffusing sound and improving the directional characteristics of the speaker, wherein the central portion is opened and a conical shape is formed outward. And a support member for supporting the diffuser plate so that the diffuser plate can be mounted so that the opening of the diffuser plate is located on the center line of the speaker. A diffuser that improves the directional characteristics of. 3. A diffuser installed in front of the speaker for improving the directional characteristic of the speaker for diffusing sound to improve the directional characteristic of the speaker, the diffuser having a conical shape, A diffuser for improving directional characteristics of a speaker, comprising: a support member that supports the diffuser so that the apex of the diffuser can be mounted on the center line of the speaker.