JPH0670392U - Speaker cabinet - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a speaker cabinet that can meet the requirements in terms of acoustic characteristics and design by using a spline curved surface. [Structure] The substantially entire surface of a speaker cabinet 7 constituted by a cabinet body portion 8, a cabinet ceiling portion 9 and a cabinet bottom portion 10, for example, an upper surface 11, a lower surface 12, an upper front surface 13 and a side surface 14 is a spline curved surface. To do. This will improve the acoustic characteristics and the degree of freedom in design and design.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speaker cabinet, and more particularly to a speaker cabinet using a spline curved surface.

[0002]

[Prior art]

 Generally, a speaker unit is housed in a speaker cabinet, but it is known that sound waves radiated from this unit are distorted due to the influence of diffraction because the propagation of sound waves changes depending on the outer shape of the cabinet. In order to prevent the influence of this diffraction, it is conceivable that the shape of the cabinet is such that the sound wave spreads smoothly, for example, a smooth curve such as a sphere or a spheroid. The baffle effect that pushes out the sound pressure to the front diminishes and the efficiency decreases.

Therefore, in order to solve the above problems, as shown in Japanese Utility Model Publication No. 4-34633, a structure has been developed in which a hyperelliptic curve shape is incorporated into a cabinet shape. The hyperelliptic curve is a curve (X, Y) represented by the following formula. (X / a) ⁿ + (Y / b) ⁿ = 1 where a and b are different constants and have a relationship of n> 2. In this type of cabinet, as shown in FIGS. 9 and 10, the upper dome 1 and the lower dome 2 are formed in a super ellipsoidal shape to remove diffraction and reflection of sound waves. Further, the body 3 is formed so that its cross section has a hyperelliptic curve, and exhibits the same effect as described above. In the figure, 4 is a low temperature range speaker unit, 5 is a middle range speaker unit, and 6 is a high range speaker unit.

[0004]

[Problems to be solved by the device]

 By the way, a super ellipsoid can sufficiently improve the acoustic characteristics if it is completely implemented in all three axes of X, Y, and Z. However, in order to maintain smooth continuity, this super ellipsoid has one formula. It is necessary to construct the whole with a closed curve represented by. However, it is relatively difficult to obtain the smoothness of the mounting portions of the speaker units 4, 5 and 6, and unevenness is likely to occur in this portion, and there is a problem that the sound waves are disturbed here. If a linear shape is taken in part to eliminate the unevenness in the mounting portion of the speaker unit, then the sound wave is disturbed at the joint between the linear portion and the curved surface. Further, although the speaker itself can be smoothly molded to some extent, there is a problem in that sound waves are disturbed due to reflection on the floor surface, and the acoustic characteristics are deteriorated from this point.

Further, as described above, since the hyper-ellipsoid is composed of a closed curve represented by one equation, even if the requirements for acoustic characteristics can be satisfied to some extent, the hyper-ellipsoid has an arbitrary shape in design. However, there is a problem that the degree of freedom in designing is reduced. The present invention has been made in view of the above problems and was devised to effectively solve them. The purpose of the present invention is to meet the requirements in terms of design and acoustic characteristics by using a spline curved surface. It is to provide a speaker cabinet that can

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention comprises a spline curved surface on almost the entire surface.

[0007]

[Action]

 Since the present invention is configured as described above, since the surface of the cabinet body is formed by the substantially splined curved surface, it is possible to suppress the diffraction of the sound wave generated from the speaker unit as much as possible and to generate the phase difference. Can be suppressed. Further, by adopting the spline curved surface, it is possible to freely select a designated point through which the curved surface should pass, so that it is possible to improve the degree of freedom in design and design.

[0008]

【Example】

 An embodiment of the speaker cabinet of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a front view showing an embodiment of a speaker cabinet according to the present invention, FIG. 2 is a side view of the cabinet shown in FIG. 1, FIG. 3 is a top view of the cabinet shown in FIG. 1, and FIG. 4 is a cabinet shown in FIG. FIG. 6 is an explanatory diagram for explaining a state in which the stand is erected on a stand. As shown in the figure, the speaker cabinet 7 has a cabinet body 8, a cabinet ceiling 9 and a cabinet bottom 10. The surface of each part and the entire surface of the connecting part of each part are formed by spline curved surfaces.

On the front surface of the cabinet body 8, a low sound range speaker unit S1, a middle sound range speaker unit S2 and a high sound range speaker unit S3 are arranged. Specifically, the above-mentioned parts are formed substantially symmetrically in the figure. For example, in FIG. 1, from the ceiling part 9 to the upper surface 11 continuous with the cabinet body 8, from the cabinet body 8 to the cabinet bottom 10. The continuous lower surface 12, the upper front surface 13 continuous from the ceiling 9 to the cabinet body 8 in FIG. 2, and the side surface 14 continuous from the side surface to the front of the cabinet body 8 in FIG. 3 are all spline curved surfaces. Is configured.

The term “spline curved surface or curve” refers to a suitable number of weights at appropriate positions on a long thin elastic strip (called a spline) when a smooth curve passing through a designated point sequence is created. It is a curve that is formed when arranging while adjusting, and a smooth curve that passes through the specified point can be created. Such a spline curve or curved surface is widely adopted in the design field of shipbuilding, automobiles, etc., for determining the curved shape of a steel strip, for example. The elastic curve determined by the spline is determined by changing the constraint conditions at both ends of the spline, and this curve is expressed as a series of separate cubic curves connected between the weights.

Here, the spline curve will be described using specific mathematical expressions. For example, a spline curve S (x) in a general formula (polynomial expression) that passes through three points is expressed as follows. i S (x) = P _{m, 0} + Σ Cj (x−xj) ^m j = ₀

Here, each character has the following contents. S (x): m-th order spline function P _{m, 0} : m-th order polynomial in the interval (x _-1 , x ₀ ), m: order C: constant xi: interval (x _i-1 , x _i ) of polynomial By this, the spline curve is defined by separate polynomials within a subsection and is smoothly connected to the next subsection.

In the case of a physical spline such as an elastic curve, the polynomial P _m will be cubic. In this case, the curvature is determined by the principle of small bending energy total amount shown in the following equation. d ² y / dx ² = M (x) / (E · I) where E is Young's modulus, I is the second moment of area, and M is the bending moment. The order in this embodiment is the third order. is there.

The speaker cabinet 7 configured in this way requires a stand 15 as shown in FIG. 4 to support the speaker cabinet 7 when it is installed on the floor, for example. The stand 15 is formed into a substantially trapezoidal shape, and a housing recess 16 for housing the cabinet bottom 10 is formed at the top. The curvature of the side surface of the stand 15 is determined so that the entire curved surface 19 continuous with the lower surface 12 of the cabinet 7, the side surface 17 of the stand 15 and the floor surface 18 as the ground contact surface forms a spline curved surface. Has been done.

When the cabinet bottom 10 is exposed to the outside, such as when the cabinet 7 is hung from the ceiling in a room, it is preferable to form the entire surface of the cabinet bottom 10 into a spline curved surface as described above. However, when the cabinet 7 is supported by the stand 15 described above, the surface shape of the bottom of the cabinet housed in the housing recess 16 is not limited to the spline curved surface, and any structure may be used. .

Next, the operation of this embodiment configured as described above will be described. As described above, the surfaces of the cabinet body 8, the cabinet ceiling 9 and the cabinet bottom 10 of the speaker cabinet 7 are configured as spline curved surfaces, so that the surfaces are arbitrary continuous smooth curves that do not disturb the sound waves. Also, since the unevenness of the mounting portion of the speaker unit can be minimized, the sound wave emitted from each speaker unit S1, S2, S3 reaches the listener with almost no diffraction or reflection, and the acoustic characteristics Can be significantly improved.

Particularly, when the cabinet 7 is installed on the floor surface 18 or the like, by using the stand 15, the curved surface continuously formed by the cabinet 7, the stand 15 and the floor surface 18 is an integral spline. Since it is configured as a curved surface, it is possible to prevent the sound wave from being diffracted or disturbed on the floor surface 18, and the acoustic characteristics can be improved more than this point.

FIGS. 5 and 6 are graphs comparing the diffraction characteristics and the total period number characteristics of the cabinet having the spline curved surface of the present application and the conventional rectangular cabinet, respectively. In the figures, the solid line represents the spline curved surface of the present application. The characteristics of the existing cabinet are shown, and the wavy line shows the characteristics of the conventional rectangular cabinet. As is clear from the figure, it was found that both the diffraction characteristics and the total frequency characteristics of the cabinet using the spline curved surface of the present invention have good flatness and show good characteristics.

Further, in the case of forming the above-mentioned spline curved surface of the cabinet surface, unlike the super-elliptical shape disclosed in Japanese Utility Model Publication No. 4-34633, the designated point can be arbitrarily selected, so the cabinet The curved shape can be made smooth while considering the capacity, plate thickness, installation location of the speaker unit, etc., and the degree of freedom of the cabinet shape, that is, the degree of freedom in design design can be significantly improved. In addition, in the above embodiment, the entire surface of the cabinet 7 was configured as a spline curved surface, but the present invention is not limited to this, and a flat surface 20 is formed on the cabinet bottom portion 10 as shown in FIGS. 7 and 8. The flat surface 20 may allow the cabinet to stand on the floor surface 18.

[0020]

[Effect of device]

 As explained above, according to the speaker cabinet of the present invention, the following excellent operational effects can be exhibited. Since the surface of the speaker cabinet is a spline curved surface, the unevenness of the speaker unit mounting part etc. can be eliminated as much as possible, and the entire surface can be a smooth curved surface, which can greatly improve the acoustic characteristics. Further, since the spline curved surface is adopted, it is possible to have an arbitrary curved surface shape unlike the conventional super-elliptical shape, and it is possible to increase the degree of freedom in design design.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a speaker cabinet according to the present invention.

FIG. 2 is a side view of the cabinet shown in FIG.

FIG. 3 is a top view of the cabinet shown in FIG.

FIG. 4 is an explanatory diagram for explaining a state in which the cabinet shown in FIG. 1 is erected on a stand.

FIG. 5 is a graph showing diffraction characteristics of a spline curve cabinet of the present application and a conventional rectangular cabinet.

FIG. 6 is a graph showing the overall frequency characteristics of a spline curve cabinet of the present application and a conventional rectangular cabinet.

FIG. 7 is a front view showing another embodiment of the speaker cabinet of the present invention.

FIG. 8 is a side view of the cabinet shown in FIG.

FIG. 9 is a side view showing an example of a conventional speaker cabinet.

FIG. 10 is a front view of the cabinet shown in FIG.

[Explanation of symbols]

7 ... speaker cabinet, 8 ... cabinet body,
9 ... Cabinet ceiling part, 10 ... Cabinet bottom part, 1
DESCRIPTION OF SYMBOLS 1 ... Upper surface (spline curved surface), 12 ... Lower surface (spline curved surface), 13 ... Upper front surface (spline curved surface), 14 ... Side surface (spline curved surface), 15 ... Stand, S1 ... Bass speaker unit, S2 ... Mid-range speaker unit, S3 ... High-range speaker unit.

Front page continuation (72) Hiroyuki Sugiyama, 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Japan Victor Co., Ltd. (72) Minoru Takahashi 3--12 Moriya-cho, Kanagawa-ku, Yokohama, Japan Victor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A speaker cabinet characterized in that substantially the entire surface is constituted by a spline curved surface.