JPH05260581A - Speaker system - Google Patents

Abstract

PURPOSE:To provide a speaker system in which distortion in sound pressure radiated from an edge can be reduced. CONSTITUTION:This system is comprised of a first speaker unit 16 provided with a projecting shape roll edge 9, a second speaker unit 17 provided with a recessed shape roll edge 11, a speaker unit 12 for middle/high frequency tone arranged almost in the center of the speaker units 16, 17, and a cabinet 13 on which the speaker units 16, 17 and the speaker unit 12 for middle/high frequency tone are mounted. By employing such constitution, asymmetric characteristic for air dislocation quantity can be eliminated keeping the synthetic value of air quantity dislocated by the projecting and recessed rolls constant for the upper and lower amplitude of the edge.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, since the digital signal processing technology has made dramatic progress and the quality of electric signals supplied to a speaker system has been greatly improved, a speaker system capable of reproducing high-quality sound is strongly desired correspondingly. Is coming.

A speaker unit used in a conventional speaker system will be described below with reference to the drawings.
FIG. 3 is a structural cross-sectional view of a conventional speaker unit. 1 is a plate, 2 is a yoke integrally formed with the plate 1, 3 is a magnet fixed to the plate 1, and 4 is fixed to the upper surface of the magnet 3. A center pole, 5 is a voice coil held in a magnetic gap formed by the outer circumference of the center pole 4 and the inner circumferential surface of the yoke 2, 6 is a bobbin of the voice coil 5, and 7 is a cone fixed to the tip of the voice coil bobbin 6. -Shaped diaphragm, 8 is a damper fixed to the outer peripheral portion of the voice coil bobbin 6, 9 is an edge provided on the outer peripheral portion of the cone-shaped diaphragm 7, and 10 is a plate 1, a yoke 2 fixed to the outer periphery of the damper 8 and the edge 9, It is a frame that holds a magnetic circuit composed of the magnet 3 and the center pole 4.

In the above structure, when an electric signal is applied to the voice coil 5, the driving force generated in the voice coil 5 is transmitted to the voice coil bobbin 6 and vibrates the cone diaphragm 7 fixed to the tip portion thereof. ..

[0005]

In such a conventional speaker unit, the cone-shaped diaphragm 7 is supported by the damper 8 and the edge 9 fixed to the outer peripheral portion of the voice coil bobbin 6, and the linear support force of these supports is linear. Becomes a problem during reproduction in the low frequency range where the amplitude becomes large, which causes harmonic distortion. Various shapes have been devised for the damper 8 and the edge 9 in order to improve the linearity of the support. As a result, what is most commonly used as the edge 9 at present is a roll shape as shown in (FIG. 4), and in combination with the corrugated damper 8, the linearity of the supporting force of the support is obtained. Has been greatly improved. But,
Here, the vibration mode of the roll-shaped edge 9 is as shown in FIG. In the figure, A is a neutral state before an electric signal is applied to the voice coil 5, B is a state in which it vibrates forward from the neutral point, and C shows a state in which it vibrates rearward from the neutral point. In each vibration state, the cone-shaped diaphragm 7 has the same amplitude value ξ moving back and forth with respect to the neutral point. That is, the edge 9 is not non-linear in its operation as a support for the cone-shaped diaphragm. However, as is clear from (FIG. 4), the amount of air removed by the edge 9 oscillating together with the cone-shaped diaphragm 7 is the same as the amount of air when moving from the position A to the state B from the positions U1 and A. When the amount of air when moving to the state of C is U2, the roll shape of the edge is deformed along with the vertical amplitude, resulting in different values. That is, the sound pressure characteristic as a speaker is proportional to the sum of the cone type diaphragm 7 and the amount of air removed by the edge 9, but the sound pressure radiated from the edge 9 has the amount of air removed as described above. Since it varies depending on the front-back movement, it essentially includes a distortion component, and the sound pressure characteristic of the speaker system using this speaker unit necessarily includes the distortion component.

The present invention solves the above problems, and an object of the present invention is to realize a loudspeaker system in which the harmonic distortion due to the edge shape is significantly reduced.

[0007]

To achieve the above object, the present invention comprises an even number of two or more speaker units, and the speaker units have the same number of edge units and have the same number of edge units. Consists of
The speaker unit reproduces the same frequency band.

At this time, the speaker units whose edge shapes are symmetrical to each other can be attached to one speaker cabinet or can be attached to different speaker cabinets.

[0009]

According to the present invention, the amount of air removed from the edge of the speaker unit and the amount of air removed from the edge of another speaker unit whose shape is symmetric to the edge of the speaker unit are neutral to which no electric signal is added. It becomes symmetrical with respect to the point, and the combined elimination amount of the air amount becomes equal to the vertical amplitude of the diaphragm.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural sectional view of a speaker system according to a first embodiment of the present invention.
In the figure, the same components as those of the conventional example shown in (FIG. 3) are denoted by the same reference numerals. Reference numeral 16 is a first speaker unit having a convex roll edge 9, 17 is a second speaker unit having a concave roll edge 11, and 12 is a speaker for middle and high frequencies arranged substantially at the center of the speaker units 16 and 17. Unit, 13 is a speaker unit 16,
It is a cabinet to which a speaker unit 17 for mid-high range 17 and 17 are attached.

The operation of the above configuration will be described below. When the same electric signal is applied to the voice coils 5 of the speaker units 16 and 17, when the cone diaphragm 7 swings upward, the convex roll 9 of the speaker unit 16 is
B in the vibration state of the roll edge shown in (Fig. 4)
State, that is, the air removal amount is U1, while the concave roll 11 of the speaker unit 17 is a vertically inverted version of the C state in the vibration state of the same figure, and the air removal amount is U2. Next, when the cone diaphragm 7 oscillates downward, the convex roll 9 of the speaker unit 16 is in the C state in the vibration state of the roll-shaped edge shown in (FIG. 4), that is, the air elimination amount is U2. , The concave roll 11 of the speaker unit 17 is obtained by vertically reversing the state B in the vibration state of FIG.
It becomes 1. That is, for the vertical amplitude of the cone diaphragm 7,
The combined amount of air removed by the convex roll 9 of the speaker unit 16 and the concave roll 11 of the speaker unit 17 is always constant at U1 + U2.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a structural sectional view of a speaker system according to a second embodiment of the present invention. In the figure, reference numeral 18 denotes a speaker unit having a convex roll edge, which is attached to the speaker cabinet 15. Reference numeral 19 denotes a speaker unit having a concave roll edge, which is attached to the speaker cabinet 14. A big difference from the first embodiment shown in FIG. 1 is that speaker units 18 and 19 having a convex roll edge and a concave roll edge are attached to independent cabinets 15 and 14, respectively. It is in. When an electric signal is applied to each of the speaker units 14 and 15, its operation is the same as in the first embodiment. The amount of air removed by the convex roll edge of the speaker unit 18 and the concave roll edge of the speaker unit 19. The composition of is always constant. Compared to the first embodiment described above, this embodiment can increase the degree of freedom in system arrangement because the speaker cabinets 14 and 15 are independently provided. Although not shown here, if a speaker system for middle and high frequencies is separately provided, a reproduction system using the speaker system of this embodiment for bass can be realized.

Although two speaker units are used in all of the above embodiments, an even number of speaker units, such as four or six, is used so that the composition of the amount of air removed by each edge is always constant. If so, the same effect as this embodiment can be obtained.

[0014]

As described above, the present invention comprises an even number of two or more speaker units, and the speaker units are composed of the same number of speaker units whose edge shapes are symmetrical to each other. By reproducing the same frequency band, the amount of air removed from the edge is made equal to the vertical amplitude of the diaphragm, which is caused by the asymmetry of the amount of air removed from the edge that has been generated in the past. It is possible to provide a speaker system in which distortion of sound pressure characteristics is significantly reduced.

Further, by mounting speaker units having symmetrical edge shapes in different speaker cabinets, it is possible to increase the degree of freedom in the arrangement of the speaker system.

[Brief description of drawings]

FIG. 1 is a structural cross-sectional view of a speaker system according to a first embodiment of the present invention.

FIG. 2 is a structural sectional view of a speaker system according to a second embodiment of the present invention.

FIG. 3 is a structural cross-sectional view of a conventional speaker system.

FIG. 4 is a diagram illustrating a vibration mode of an edge portion of a conventional speaker system.

[Explanation of symbols]

 9,11 Edge 13,14,15 Speaker cabinet 16,17,18,19 Speaker unit

Claims (3)

[Claims] 1. An even number of speaker units of two or more are provided, and the speaker units are composed of the same number of speaker units each having an edge-symmetrical structure.
A speaker system in which the speaker units reproduce the same frequency band. 2. The speaker system according to claim 1, wherein the speaker units having edge-symmetrical structures are attached to one speaker cabinet. 3. The speaker system according to claim 1, wherein the speaker units having edge-symmetrical structures are attached to different speaker cabinets.