JP3835211B2 - Damper and speaker using it - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a damper and a speaker using the damper. More particularly, the present invention relates to a damper having improved stiffness symmetry and amplitude symmetry and a speaker using the damper.
[0002]
[Prior art]
Conventionally, a damper is used to support a vibration system of a speaker. Generally, the most important characteristic of a damper is considered to be linearity, and many attempts have been made to improve linearity.
[0003]
By the way, the characteristic of the damper that substantially affects the audibility of the reproduced sound is the symmetry of amplitude and stiffness rather than linearity. However, conventionally, only improvement of linearity is considered as described above, and there are few known attempts to improve the symmetry of amplitude and stiffness.
[0004]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a damper having improved stiffness symmetry and amplitude symmetry, and a speaker using the damper. is there.
[0005]
[Means for Solving the Problems]
The damper of the present invention includes a plurality of corrugations having peaks and valleys, the pitch between the peaks and valleys of the outermost periphery is larger than the pitch between the other peaks and valleys, and the height of the peaks of the outermost periphery is other than It is higher than the height of the peak portion, and the radius of the peak portion at the outermost peripheral portion is smaller than the radius of the other peak portion.
[0006]
In a preferred embodiment, the pitch between the peaks and valleys of the outermost periphery is in the range of 105 to 140% with respect to the pitch between the peaks and valleys other than the above, and the height of the peaks of the outermost periphery is the other peaks. The radius of the peak portion at the outermost peripheral portion is in the range of 50 to 95% with respect to the radius of the other peak portion.
[0007]
In a preferred embodiment, the damper of the present invention has a rising shape.
[0008]
According to another aspect of the present invention, a speaker including the damper is provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.
[0010]
FIG. 1 is a schematic cross-sectional view of a speaker using a damper according to a preferred embodiment of the present invention. FIG. 2 is an enlarged view of the damper of FIG. The speaker 10 of the present invention includes a frame 1, a diaphragm 3 attached to the frame 1 via an edge 2, a voice coil 4 that drives the diaphragm 3, and a magnetic circuit that forms a magnetic field that intersects the voice coil 4. 5 and a damper 6.
[0011]
The damper 6 includes a plurality of corrugations having peaks and valleys. In FIG. 2, a damper having five corrugations concentrically is illustrated. In the present invention, the pitch P8 between the peaks and valleys at the outermost periphery of the corrugation is larger than the pitches P1 to P7 between the other peaks and valleys, and the height H9 of the peaks at the outermost periphery is higher than the heights H1 to H8 of the other peaks. The radius R9 of the outermost peak is smaller than the radii R1 to R8 of the other peaks. The peak-to-valley pitch P8 at the outermost periphery is preferably in the range of 105 to 140%, more preferably in the range of 110 to 120% with respect to the other pitches P1 to P7. The height H9 of the outermost peak is preferably in the range of 115 to 200%, more preferably in the range of 140 to 170% with respect to the heights H1 to H8 of the other peaks. The radius R9 of the outermost peak is preferably in the range of 50 to 95%, more preferably in the range of 70 to 85% with respect to the radii R1 to R8 of the other peaks.
[0012]
The pitches P1 to P7 may be the same or different. If the pitches P1 to P7 are different, the pitch P8 only needs to be larger than the maximum of the pitches P1 to P7. Similarly, the heights H1 to H8 may be the same or different. When the heights H1 to H8 are different, the height H9 only needs to be larger than the maximum of the heights H1 to H8. Further, the radii R1 to R8 may be the same or different. When the radii R1 to R8 are different, the radius R9 only needs to be smaller than the smallest of the radii R1 to R8.
[0013]
In addition, although the damper which has five corrugations was demonstrated, it cannot be overemphasized that arbitrary appropriate numbers of corrugations can be employ | adopted according to the objective.
[0014]
The damper of the present invention preferably has a so-called rising shape. That is, it is fixed to the frame at a position lower than the center of the corrugation (for example, position E2 in FIG. 2).
[0015]
The operation of the present invention will be described below.
According to the present invention, the pitch between the valleys in the outermost periphery is larger than the pitch between the other valleys, the height of the peaks in the outermost periphery is higher than the heights of the other peaks, and the outermost periphery. By using a damper whose radius of the other peak is smaller than the radius of the other peak, a speaker with significantly improved stiffness symmetry and amplitude symmetry can be obtained. In other words, according to the damper having such a shape, even if the corrugation increases at a large amplitude, the stiffness of the extended portion is equal to or smaller than the stiffness of the outermost peripheral bending point. As a result, since the inclination angle of the outer peripheral rising portion can be reduced, the symmetry of the vertical amplitude and the symmetry of the stiffness can be maintained well. Furthermore, since the angle difference between the outermost peripheral bending points at the time of vertical amplitude can be reduced, the symmetry of stiffness can be maintained well.
[0016]
More specifically, by increasing the pitch of the outermost periphery and increasing the height of the peak portion of the outermost periphery, the position of the outermost periphery bending point moves upward and outward. Moreover, according to the present invention, by reducing the radius of the outermost peripheral ridge, the position of the bending point moves further upward and outward, so that the symmetry is remarkably improved. At the same time, since the inclination angle inside the outermost peripheral corrugation is close to the inclination angle of the other corrugations, a large stiffness change that affects the symmetry does not occur, and as a result, the symmetry is further improved. As a result, it is possible to achieve an operation with a small stiffness at the time of a small input and a good response, and the vertical symmetry of the amplitude and stiffness is maintained well even at the time of a large input. It becomes possible.
[0017]
In a preferred embodiment, the damper of the present invention has a so-called rising shape. That is, it is one of the features of the present invention that good symmetry can be maintained even in a rising shape where it is difficult to ensure symmetry.
[0018]
【Example】
Example 1
A speaker as shown in FIG. 1 was produced using a damper as shown in FIG. More specifically, the damper has five corrugations, the pitches P1 to P7 are 2.4 mm, the pitch P8 is 2.7 mm (112.5% with respect to the pitches P1 to P7), and the heights H1 to H8 are 0. .6 mm, height H9 is 1.0 mm (166.7% relative to heights H1 to H8), radii R1 to R8 are 1.1 mm, and radius R9 is 0.9 mm (relative to radii R1 to R8) 81.8%).
[0019]
With respect to the obtained speaker, the symmetry of amplitude in the vertical direction and the symmetry of stiffness when the amplitude was changed were measured. The symmetry of the amplitude was expressed by the relationship between the load and the displacement when the load was gradually applied in the vertical direction and then gradually released. The symmetry of stiffness is represented by the relationship between the vertical amplitude and the load at each amplitude.
[0020]
FIG. 3 shows the result when the amplitude is 3 mm, FIG. 4 shows the result when the amplitude is 6 mm, FIG. 5 shows the result when the amplitude is 8 mm, and FIG. 6 shows the result when the amplitude is 9.5 mm.
[0021]
(Comparative Example 1)
A speaker was produced in the same manner as in Example 1 except that a conventionally used damper was used. More specifically, the damper has five corrugations, the pitch P1 to P7 is 2.4 mm, the pitch P8 is 2.4 mm, the height H1 to H8 is 0.6 mm, the height H9 is 0.6 mm, and the radius R1. ˜R8 was 1.1 mm and radius R9 was 1.1 mm.
[0022]
The obtained speaker was subjected to the same evaluation as in Example 1. FIG. 7 shows the result when the amplitude is 3 mm, FIG. 8 shows the result when the amplitude is 6 mm, and FIG. 9 shows the result when the amplitude is 8 mm.
[0023]
As apparent from comparison between FIGS. 3 to 6 and FIGS. 7 to 9, the damper of the present invention has significantly improved amplitude symmetry and stiffness symmetry as compared with the damper of the comparative example. .
[0024]
Furthermore, sensory evaluation on the audibility of reproduced sound was performed for each of the speaker using the damper of the present invention and the speaker using the damper of the comparative example, and the evaluation of the speaker of the present invention was remarkably high.
[0025]
【The invention's effect】
According to the present invention, including a plurality of corrugations having peaks and valleys, the pitch between the peaks and valleys of the outermost periphery is larger than the pitch between the other peaks and valleys, the height of the peaks of the outermost periphery is other than Remarkably improved stiffness symmetry and amplitude symmetry by using a damper having a shape that is higher than the height of the peak and the radius of the outermost peak is smaller than the radius of the other peak As a result, it is possible to obtain a speaker with excellent audibility.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a speaker using a damper according to a preferred embodiment of the present invention.
FIG. 2 is an enlarged view of the damper shown in FIG.
FIG. 3 is a graph showing amplitude symmetry and stiffness symmetry of the damper of the present invention, wherein (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 4 is a graph showing amplitude symmetry and stiffness symmetry for the damper of the present invention, wherein (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 5 is a graph showing amplitude symmetry and stiffness symmetry of the damper of the present invention, wherein (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 6 is a graph showing amplitude symmetry and stiffness symmetry for the damper of the present invention, wherein (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 7 is a graph showing amplitude symmetry and stiffness symmetry for a damper of a comparative example, where (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 8 is a graph showing amplitude symmetry and stiffness symmetry for a damper of a comparative example, in which (a) is a load-displacement curve showing amplitude symmetry, and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
FIG. 9 is a graph showing amplitude symmetry and stiffness symmetry for a damper of a comparative example, in which (a) is a load-displacement curve showing amplitude symmetry and (b) is a graph of (a). (C) is a graph showing stiffness symmetry.
[Explanation of symbols]
1 Frame 2 Edge 3 Diaphragm 4 Voice coil 5 Magnetic circuit 6 Damper 10 Speaker

Claims (4)

Including a plurality of corrugations having peaks and valleys, the pitch between the peaks and valleys in the outermost periphery is larger than the pitch between the other valleys, and the height of the peaks in the outermost periphery is higher than the heights of the other peaks A damper that is high and has a radius of the outermost crest that is smaller than the radius of the other crest. The pitch between the valleys of the outermost periphery is in a range of 105 to 140% with respect to the pitch between the other valleys, and the height of the peaks of the outermost periphery is relative to the height of the other peaks. 2. The damper according to claim 1, wherein the damper has a range of 115 to 200%, and a radius of the peak portion of the outermost peripheral portion is in a range of 50 to 95% with respect to a radius of the other peak portion. The damper according to claim 1, wherein the damper has a rising shape. A speaker including the damper according to claim 1.

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