JPH0427276Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the structure of a speaker damper that supports the vibration system of an electrodynamic speaker designed to be particularly thin in the field of electroacoustic equipment.

[Prior Art] A typical structure of a conventional damper that supports the vibration system of an electrodynamic speaker is explained by referring to FIG. 3, which shows a state where it is assembled into a speaker as Conventional Example 1. By heat-pressing the woven fabric using a high-temperature mold, a center portion 2 is formed with a hole into which the voice coil 25 of the speaker is inserted.
Around 3, multiple concentric corrugations 2
1a is formed, a rising part 22 is provided on the outer periphery of the main body part 21, and a frame 2 is provided on the outer periphery of the lower end of the rising part 22.
6 is formed. The height of the center portion 23 from the top surface of the circuit is approximately equal to the height h of the rising portion 22 on the outer periphery of the main body portion 21, so that when the vibration system of the speaker vibrates, the center portion 23 of the damper
In consideration of the maximum amplitude of the vibration system, the dimensions are set to be larger than the maximum amplitude of the vibration system so as not to collide with the bottom surface of the frame 26.

In such a damper with the most common shape, when the speaker becomes thin and the distance between the diaphragm 27 and the damper becomes narrow, when the diaphragm 27 is lowered, the upper end of the rising part 22 of the damper and the diaphragm 27 came into contact and caused noise.

The rising part 22 and the diaphragm 27 of such a damper
In order to increase the distance between the upright portion 22 and the diaphragm 27 and to maintain the distance between the damper center portion 23 and the frame 26 to the required dimension (i.e., h) in order to prevent accidents caused by contact with the There is a damper whose cross section is shown in Figure 4. In this damper, the height h' of the outer peripheral rising portion 22' is lower than the height h of the conventional example 1, so that the envelope surface of the corrugation of the main body part 21' becomes gradually higher toward the damper center part 23'. It is configured to form a conical surface.

[Problems to be Solved] Regarding the speaker damper used in the conventional thin speaker having such a structure, the one with the shape of Conventional Example 1 is unsuitable for use in the thin speaker for the reasons mentioned above. The damper of Example 2 satisfies the purpose from the standpoint of securing the required amplitude of the speaker vibration system, but the shape of the main body 21', which mainly absorbs the displacement of the vibration system, changes from the outer periphery to the center part of the damper.
It forms a conical surface that gradually becomes higher toward 3', and is asymmetrical in the vertical direction, so its compliance is also asymmetrical in the vertical direction.
This had the disadvantage of increasing non-linear distortion of the speaker.

[Means for Solving the Problems] A speaker damper according to the present invention for solving the drawbacks of the conventional example described above is shown in FIG. 1 showing a cross section of an embodiment, and FIG. To explain with reference to the drawings, the speaker damper of the present invention has an outer portion 2 located outside approximately the middle in the radial direction of a speaker damper in which a plurality of concentric corrugations are formed on a main body portion 1, and an inner portion located inside the speaker damper. 3, the rising angle α1 of the corrugation 1b at the boundary with the corrugation 1b is larger than the rising angle α0 of the corrugation 1a at the part other than the boundary, and the outer part 2 is lower than the inner part 3 by a step D. have

[Function] In a damper having such a configuration, when the diaphragm 5 is significantly displaced downward in FIG. Since it is lower, the damper outer peripheral portion 2a will not collide with the diaphragm 5.

Furthermore, the outer portion 2 and the inner portion 3 of the main body portion 1
The rising angle α1 of the corrugation 1b at the boundary with
is larger than the rising angle α0 of the corrugation 1a in the part other than the boundary part, and the vertical stiffness of this corrugation part is extremely large and does not contribute as compliance to the vertical displacement of the damper, so in terms of linearity with respect to displacement. There is substantially no boundary corrugation, that is, the damper operates in the same manner as a flat damper without a step D, and non-direct linear distortion due to the shape does not occur.

[Example] Fig. 1 is a cross-sectional view illustrating the cross-sectional shape of an example of the present invention, in which the main body part 1 of the damper is formed by a mold in which a woven fabric impregnated with phenol resin as a filler is heated. It is hot pressed into a predetermined shape. The body portion 1 of the tamper is divided into a portion 2 outside the boundary and a portion 3 inside the radial direction, each having a plurality of concentric corrugations 1a.

The rising angle α1 of the boundary corrugation 1b between the outer region 2 and the inner region 3 is as follows:
The rising angle α0 of the corrugation 1a in the portion other than the boundary portion is larger and steeper, and the rigidity is greater against vertical displacement of the damper.

Furthermore, the outer part 2 is lower than the inner part 3 to provide a step D between the outer part 2 and the inner part 3, and the center part 4 of the inner part 3 is set at a height H sufficient for the maximum amplitude of the vibration system. The height H' of the outer circumferential rising portion 2a of the outer portion 2 is lower than the height H by a step D, and maintains a distance between it and the diaphragm 5 that can absorb the maximum amplitude.

The above-mentioned damper is bonded together with the diaphragm 5 to the voice coil bobbin 6, as in the conventional example, and is held inside the frame 7 to constitute a speaker.

Above, the speaker damper according to the present invention has been described in detail based on a typical embodiment, but the damper according to the present invention is not limited to the structure of the above embodiment, and for example, the material of the tamper may be In addition to the woven fabric, synthetic resin sheets may be used, and other modifications may be made as appropriate as long as the present invention has the constituent requirements specified in the present invention and has the functions and effects specified in the present invention.

[Effects] The speaker damper according to the present invention described above has the following advantages compared to the conventional structure.

(1) Since the height H' of the outer periphery of the damper is lower than the height H of the central part by the step D, even if the diaphragm is a thin diaphragm with a short overall height, when the diaphragm is significantly displaced downward, the damper The outer periphery never collides with the diaphragm. Therefore, even if the speaker is thin, a speaker with a large maximum amplitude and a large permissible input can be obtained.

(2) The rising angle α1 of the corrugation at the boundary between the outer portion and the inner portion is larger than the rising angle α0 of the corrugation at the portion other than the boundary portion, and the vertical stiffness of this corrugation at the boundary is extremely large, causing vertical displacement of the damper. Therefore, in terms of linearity with respect to displacement, there is virtually no boundary corrugation; in other words, it operates in the same way as a flat damper with no steps, so the amplitude linearity in the vertical direction is good. It also has the advantage of not causing amplitude distortion.

Due to the above advantages, by using the damper according to the present invention, it is possible to obtain an excellent quality speaker which is thin, has a large allowable input, and has little amplitude distortion.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the speaker damper according to the present invention, Fig. 2 is a sectional view of the damper in use, and Fig. 3 is a conventional example 1.
FIG. 4 is a sectional view of a main part of conventional example 2. 1 is a main body part, 1a is a corrugation, 1b is a boundary part corrugation, 2 is an inner part, 3 is an outer part, and 4 is a center part.

Claims (1)

[Scope of utility model registration request] Rising angle α of the corrugations 1b at the boundary between the outer region 2 located outside approximately the middle in the radial direction of a speaker damper in which a plurality of concentric corrugations are formed in the main body 1 and the inner region 3 located inside the radial direction.
1 is larger than the rising angle α0 of the corrugation 1a in a portion other than the boundary portion, and the outer portion 2 is lower than the inner portion 3 by a step D.