JPH0134468Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the cabinet shape of a speaker system.

In the rectangular parallelepiped cabinet that has been widely used in the past, the size of the baffle plate on which the speaker unit is attached is finite, so when sound waves pass around it, the propagation direction changes and a diffraction phenomenon occurs, resulting in the frequency characteristics shown by the dotted line in Figure 5. Peaks and dips occur as shown in . In addition, at the front of the cabinet, the shorter the wavelength compared to the dimensions of the cabinet, the greater the influence of diffraction. It is well known that the negative effects of this diffraction can be minimized by making the cabinet spherical; however, spherical cabinets are not easy to manufacture and difficult to install, making them a suitable shape for commercial products for general use. isn't it. Furthermore, since the reflection of the sound wave by the spherical baffle does not occur in one direction like the reflection from the flat baffle, but instead diverges, it has the disadvantage that the frontal sound pressure decreases.

A common cabinet shape that reduces the diffraction of sound waves and eliminates the drawbacks of a spherical cabinet is a rectangular cabinet with the joining surfaces of the buff-full plate and the left and right side walls in an arc shape 3, as shown in Figure 1. Alternatively, as shown in Figure 2, there are some with cut corners, but all of them are cylindrical surfaces with a constant radius regardless of the reproduction band of the attached unit, or there is a ridge at the buffled end. Therefore, the effect was not perfect.

This invention improves the drawbacks of the conventional cabinet in terms of diffraction effects, minimizes the deterioration of the buffling effect, and eliminates the effects of diffraction. Examples thereof will be described below.

In FIGS. 3 and 4, reference numeral 1 denotes a cabinet, and the necessary speakers 31, 32, . . . are attached to the baffle plate 11. Batsuful board 1
1 and the left and right side plates 12, 12' are provided with notches 13, 13' into which the front decorative plate 2 is fitted.

The front decorative board 2 has side beams 21, 21' and upper and lower beams 2.
2 and 23, and a decorative part 25 made of cloth or a perforated plate.
21' is attached to the cabinet 1 in a state where it is fitted into the notches 13, 13'. Side beams 21, 2
1' forms curved surfaces 26, 26' with radius R, but in order to eliminate the influence of the diffraction described above, curved surfaces 26, 26' are formed.
From experimental results, it is appropriate that the radius R of 26' satisfies 0.3l≦R≦0.6l (1), where l is the distance from the center of the tweeter to the side wall.

When the radius of curvature R is smaller than 0.3l, the curved surface 13,
13' loses its effect as a curved surface and begins to exhibit the same diffraction effect as the edges. Further, when R is larger than 0.6l, the flat portion of the buffle 11 becomes smaller, resulting in characteristics close to a spherical buffle, and the buffle effect becomes smaller.

Since the speaker cabinet according to the present invention is composed of the cabinet 1 and the front decoration plate 2 as described above, when the front decoration plate is fitted and attached to the cabinet, the speaker mounting surface of the buttful plate and the front decoration It is on the same plane as the frontmost part of the board, and the external appearance of the speaker cabinet as a whole is such that the round board and the left and right side boards form a smoothly continuous curved surface with a radius of R, so there is enough round board to reflect sound waves forward. Although the speaker cabinet has a large area, it can be made into a speaker cabinet that is effective in eliminating the adverse effects of cabinet diffraction and obtaining excellent frequency characteristics as shown by the solid line in FIG.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional cabinet, Figure 2 is a perspective view of another conventional cabinet, Figure 3 is a horizontal sectional view of the cabinet of the present invention, Figure 4 is an exploded perspective view of the cabinet of the present invention, and Figure 5 is a perspective view of the cabinet of the present invention. The figure is a frequency characteristic diagram. 1 is a cabinet, 11 is a full board, 12,
12' is a left and right side plate, 13, 13' are notches, 2 is a front decorative plate, 21, 22 are side beams, and 26, 26' are curved surfaces.

Claims (1)

[Scope of utility model registration request] A notch 13 is provided at the joint between the buttful plate 11 and the left and right side plates 12, 12' that constitute the cabinet 1.
13', which fits into the notches 13, 13', and has a radius of curvature R of 0.3l≦R≦0.6l (where l is the distance from the center of the tweeter to the side wall) from the front side to the side. This speaker cabinet has a structure in which a front decorative plate 2 forming curved surfaces 26, 26' is fitted into the cutouts 13, 13'.