JPS584400Y2 - speaker - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to improve the damper of a speaker, and to provide a speaker with large amplitude and good linearity.

Generally speaking, a speaker has a magnet 1 as shown in Figure 1.
．． Center pole 2. A coil bobbin 6 on which a voice coil 5 is mounted is placed in a magnetic gap formed by a center ball 2 and a front plate 3 of a magnetic circuit consisting of a front plate 3 and a back plate 4, and a diaphragm 7 is fixed to the upper end of the coil bobbin 6. ing.

Further, the outer peripheral edge of the diaphragm 7 is connected to the frame 9 via the edge 8.
is combined with

Further, the coil bobbin 6 is elastically supported by a damper 10 so that the voice coil 5 is located at the center of the magnetic gap.

In the structure of such a speaker, the damper may be a corrugation damper in which concentric corrugations are formed by impregnating cloth or the like with phenol or the like, or a punched damper formed from a synthetic resin board such as a baked board.

The punched damper has a thickness of 0.3 mm to 1 mm, as shown in Figure 2.
．． A synthetic resin plate such as a Bakelite plate having a thickness of 5 mm is punched out as shown in the figure, and the outer ring 11 and the inner ring 12 are fixed on a frame or front plate and a coil bobbin, respectively.

Thus, the punched damper has arm parts 13 formed between the inner circumferential ring part 12 and the outer circumferential ring part 11 and having folded parts 14 at both ends. It is recommended not to come into contact with the

Although such a punched damper has good linearity, it has the disadvantage that it cannot have a large amplitude.

That is, the punched damper obtains a support length that corresponds to the amplitude change by twisting around the folded portion 14 as a fulcrum and displacing in the direction in which the gap between both arm portions 13 widens. Although it is necessary to increase the length in the circumferential direction, the gap between the outer circumferential annular portion 11 and the inner circumferential annular portion 12 is narrow and space is restricted.

Furthermore, if the arm portion 13 is made longer than necessary, the arm portion 13 vibrates in a so-called cantilever-lever vibration mode, so that it is forced to resonate at a certain frequency.

This resonance affects the vibration of the diaphragm, causing abnormal noise.

This invention is designed to solve the drawbacks of the above-mentioned conventional example.
In order to obtain a large amplitude without increasing the length, corrugations 15 are provided on the arms formed between the inner circumferential ring part 12 and the outer circumferential ring part 11, as shown in FIG. It is.

The corrugation 15 is formed in a portion located in the circumferential direction of the arm portion 13 so that its waveform follows the circumferential direction.
.

Since this invention has the above-described structure, in addition to the displacement of the arm portion 13, the displacement due to the expansion and contraction of the corrugation 15 is added, so that it is possible to obtain a significantly larger amplitude than the conventional punched damper.

That is, as mentioned above, the punched damper of this invention has a sufficient amplitude because the conventional punched damper changes the support length in accordance with the amplitude change by changing the gap of the arm part 13 with the folded part 14 as the fulcrum. However, in addition to the change in the support length due to the change in the gap between the arm parts 14, the length of the arm part 13 itself changes due to the expansion and contraction of the corrugation 15, resulting in large amplitude motion. It is possible to have sufficient followability even for.

Furthermore, even if a stamped damper with the same amplitude is obtained, by adopting this invention, the length of the arm portion 13 can be made small, so that the resonance of the arm portion 13 can be weakened.

Figure 4 shows the Kerr vertical curve (solid line in the figure) of the damper based on this invention, and the corrugation damper (dotted line in the figure).
It can be seen that the linearity is better than that of the damper, and the displacement area is expanded compared to the conventional punched damper (dotted chain line in the figure).

The most suitable material for such a damper is polyacrylate resin or polycarbonate resin.

As explained above, this invention is based on the punched damper and the arm portion 13 formed between the inner circumferential annular portion 12 and the outer circumferential annular portion 11.
A punched damper with a corrugation having a waveform along the circumference in the circumferential portion of the damper, which maintains the characteristic of a punched damper of good linearity and has sufficient amplitude. Solve the shortcomings that did not exist,
This has the advantage of being able to provide a speaker with large amplitude and good linearity.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a speaker using a corrugation damper, Figure 2 is a perspective view of a conventional punched damper, Figure 3 is a perspective view of the damper used in this speaker, and Figure 4 is a Kerr displacement curve. be. 12 is an inner ring part, 11 is an outer ring part, 13 is an arm part, 1
5 is corrugation.

Claims (1)

[Scope of utility model registration request] In a speaker in which a coil bobbin is supported by a punched damper in which an arm portion 13 is formed between an inner circumferential annular portion 12 to be fixed to the coil bobbin and an outer circumferential annular portion 11 to be fixed to a frame etc., the arm portion 13 Corrugation 1 whose waveform is along the circumferential direction is located in the circumferential direction of
A speaker characterized by having 5