JP2582178Y2 - A diffuser that improves the directional characteristics of the speaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffuser for improving the directional characteristics of a speaker, particularly, a speaker for medium and treble sounds.

[0002]

2. Description of the Related Art A sound wave emitted from a speaker spreads spherically while the frequency is low. However, as the frequency increases, the sound wave concentrates only on the front of the speaker and does not spread to the surroundings. FIG. 6 shows an example of a directional pattern of a commercially available model. As the frequency increases, the sound pressure level sharply decreases as the frequency deviates from on the front axis (0 °). Can hardly reach. And
The stronger the directivity, the less the indirect sound reflected in the room can enter, and the sound coming into the ear of the person in front of the speaker will be only the direct sound from the speaker, compared to live performance. It becomes a sharp, jagged, unpleasant sound. Also, if the directivity is strong, the sound is concentrated only in one place, the sound quality balance is deteriorated, and the stereo effect is significantly different depending on the position in the stereo performance, and the position where the stereo effect is obtained is very limited. . For this reason, in a conventional cone-type speaker, a range in which a sound having substantially uniform intensity can be obtained is set to about 60 degrees from the center of the speaker.

[0003]

[Problem to be solved by the present invention]
To solve the above problem of the treble speaker, eliminate the directivity of the sound, reproduce a sound close to live performance, and obtain a speaker diffuser that can obtain a stereo effect at any position With the goal.

[0004]

According to the present invention, there is provided a diffuser for improving the directional characteristics of a speaker according to the present invention, which is installed in front of the speaker to diffuse sound and improve the directional characteristics of the speaker. A diffuser plate having an opening in the center and having a shape of an inverted funnel that spreads outward in a conical shape;
This problem can be solved by adopting a configuration characterized by comprising a supporting member for supporting the diffusion plate so that the opening of the diffusion plate can be mounted on the center line of the speaker.

[0005]

[Function] By attaching the diffuser to the baffle plate of the speaker so that the opening at the center of the diffuser is located on the center axis of the speaker, the sound from the speaker is
Since it has an inverted funnel shape, it hits the back surface of the diffuser plate, is reflected and diffuses all around , and also spreads forward through a central gap. At this time, the spread of sound can be adjusted by appropriately selecting the angle of the funnel of the diffusion plate, and the size of the opening can be adjusted.
The proportion of the sound spreads by reflected sound straight of sound waves by adjusting can be arbitrarily adjusted, it is possible to set the optimum conditions depending on the situation of. Therefore, the directivity of the sound is eliminated and the sound becomes omnidirectional, and a sound close to a live performance is obtained. Then, the stereo effect anywhere by simply placing the speakers to the left and right is obtained, need not name to select a listening grayed position as in a conventional stereo system.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and comparative examples of the present invention will be described below with reference to the drawings. 1 to 3 show a first comparative example of a diffuser for improving the directivity characteristics of a conventional speaker. In the figure, reference numeral 1 denotes a diffuser, which comprises a diffuser plate 2 and a support member 3 for supporting the diffuser plate and attaching the diffuser plate to the front of a speaker. The support member 3 is composed of a pair of angle members as shown in the drawing, and a diffusion plate mounting adjustment slot 5 is formed at a rising portion of the angle member. The diffusion plate 2 is formed of a pair of rectangular plates having a width equal to or greater than the length of the sound wavelength, and mounting bolts 7 are protruded on the side surfaces thereof. By tightening, it can be attached to the support member so as to have a linear gap 8 at the base and spread outward in a V-shaped cross section. The width of the gap 8 can be adjusted by moving the mounting bolt 7 along the mounting adjustment slot 5, and the angle of the diffusion plate can be adjusted by rotating the diffusion plate 2 with the mounting adjustment bolt as a fulcrum. Can be adjusted freely. The width of the diffusion plate may be any length as long as it is equal to or longer than the wavelength.

The diffuser 1 configured as described above for improving the directional characteristics of the speaker is shown in FIG.
0 is attached to the baffle plate 11 so that the center of the gap 8 is located on the center axis of the speaker. As a result, the sound generated by the speaker is, as shown in FIG.
While hitting the back surface of the diffusion plate 2 and reflecting and diffusing to the side,
It also extends forward through the central gap 8. At this time, the degree of spread of the sound can be adjusted by adjusting the angle of the diffusion plate 2. In addition, by adjusting the gap amount, it is possible to arbitrarily adjust the ratio of the sound that travels straight and the sound that is reflected and diffused. However, the vertical direction of the gap length direction
The sound is diffused in the direction due to reflection on the diffusion plate 2,
The sound does not diffuse along the length of the gap, so
It is not possible to eliminate directivity for all positions on the right
No.

[0008] Figures 3 and 4 show the actual施例of the present invention. The diffuser 19 of this embodiment is characterized in that the diffusion plate is formed in an inverted funnel shape. In the drawing, reference numeral 20 denotes a diffusion plate, which is formed in an inverted funnel shape as shown in FIG.
1, which is supported by a support member 23 and mounted on a cabinet 24 of the speaker 22 so that the center of the gap is located on the center axis of the speaker as shown in FIG. As a result, the sound is reflected all around by the diffusion plate 20 and goes straight from the opening and spreads forward. Even if the sound has a high frequency, the sound with the same sound pressure can be obtained at the same distance in front, back, left and right. In the present embodiment, the inclination angle of the reverse funnel is 45 °.
Although the sound is reflected at a right angle, the opening amount and the inclination angle of the funnel should be set so that the ratio of the sound that goes straight and the sound that spreads, and the degree of spread of the sound that spreads, satisfy the desired conditions. Thus, the best sound according to the situation can be reproduced. In the speaker shown in the figure, the bass is emitted from the bottom opening of the cabinet 24.

FIG. 5 shows a diffuser 30 according to a second comparative example in which an opening is removed from the diffuser plate of the present invention. In the present comparative example, the diffusion plate 31 is formed completely in a conical shape without providing an opening, and the sound from the speaker 33 is reflected by the entire conical surface as shown by the arrow in the drawing, and is diffused all around. Because of the cone
The sound diffuses in the axial and horizontal directions, but in the axial direction of the cone.
Sound does not diffuse in front of the speakers. In addition, 32 is a support member.

[0010]

[Effects of the Invention] The present invention is configured as described above and has the following special effects. The sound from the speakers is, leakage
The light hits the back side of the dove-shaped diffuser plate, reflects and spreads all around , spreads out, and also spreads forward through the center opening. A sound close to is obtained. A stereo effect can be obtained anywhere just by sounding the speakers left and right, and there is no need to select a listening position as in the conventional stereo system. The structure is simple, it can be easily attached to a conventional speaker, and it can be obtained at low cost.

[Brief description of the drawings]

1A and 1B show a first comparative example of a diffuser for improving the directional characteristics of a conventional speaker, wherein FIG. 1A is a side view in a state where the speaker is attached to the speaker, FIG. 1B is a front view, and FIG. It is.

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

FIG. 3 is a plan view of the embodiment of the present invention in a state where the speaker is attached to the speaker.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view in a state where the speaker is attached to a speaker of a second comparative example.

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

[Explanation of symbols]

 1, 19, 30 Diffuser 2, 20, 31 Diffusing plate 3, 23, 32 Supporting member 8 Gap 21 Opening 10, 22, 33 Speaker

Claims (1)

(57) [Scope of request for utility model registration] 1. A diffuser installed in front of a speaker to diffuse sound and improve the directivity of the speaker, the speaker having an opening in the center.
A diffuser plate formed in the shape of an inverted funnel having one outwardly extending conical shape, and a supporting member for supporting the diffuser plate so that the opening of the diffuser plate can be positioned and mounted on the center line of the speaker. A diffuser for improving the directional characteristics of a speaker, comprising: