JPS63120594A - Speaker - Google Patents

Abstract

PURPOSE:To prevent the distortion of a cantilever and to obtain a speaker to which acoustic characteristic is excellent by disposing parts which are cantilevers easily changeable in length and parts which are supported at both- side easily movable up-and-down in series, and connecting the former parts by means of an annular. CONSTITUTION:The hatched line parts 29 are the cantilevers which are supported by an inner annular part 28, and all cantilevers 29 are connected by means of an annular 30. Mesh parts 31 are the both-side beam supported by an outer annular part 27, which are connected in series through the cantilevers 29 and the annular 30. Thus, since the cantilevers 29 easily changeable in its size are employed, only warping occurs in them 29 and almost no distortion occurs, hence there occurs no portions where stress collects. Since the both-side beam 31 are connected with the cantilevers 29 in series, the blanked damper 11 moves only up-and-down, causing no such movement as rotating a voice coil 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to speakers used in various audio equipment, video equipment, communication equipment, and the like.

2. Description of the Related Art Conventionally, this type of speaker has a structure as shown in FIG.

That is, a frame 6 is connected to a magnetic circuit 6 constituted by a plate 2 with a center ball 1, a ring-shaped magnet 3, and a two-piece ring-shaped upper plate 4. : The peripheral edge of the diaphragm 8 is adhesively bonded together with the gasket 7 to the peripheral edge of the frame 6, and the voice coil 10 is properly connected to the magnetic gap 9 of the magnetic circuit 5 in the center of the diaphragm 8. A bobbin 12 of a voice coil 1o supported by a punched damper 11 is connected to the diaphragm 8, and a dust cap 13 is attached to the upper center surface of the diaphragm 8. Conventionally, this type of punched damper 11 has a structure in which a large number of slits 15 are provided between outer and inner annular portions 14 as shown in FIG.

Other conventional examples of punched dampers 11 include those in which an arm portion 16 is formed between the outer and inner annular portions 14 as shown in FIG. There is a structure in which the annular portions 14 are connected by a plurality of S-shaped beams 17.

Problems to be Solved by the Invention First, the dimensional changes of the damper in the operating state of the speaker are
This will be explained using figures. In this figure, the stationary 3...- state is shown by a solid line. The outer ring part of the punched damper 11 is fixed to the frame 6, and the inner ring part is fixed to the bobbin 12 of the voice coil 10. When a signal is input to the speaker and the voice coil 10 oscillates, it becomes, for example, in the state shown by the broken line in the figure. The punched damper 11 in this state is longer in length than in the resting state.

In other words, if the length of the movable part of the stamped damper 11 in the stationary state is A and the amplitude distance is B, then the length C of the stamped damper 11 in the amplitude state is c=J7F.

In other words, it is longer than when it is at rest.

Since the conventional punched damper 11 shown in FIG. 6 has a long dimension, twisting occurs in the beam part 19 and stress concentrates on the support point part 20 of the beam, so if the speaker continues to operate, Material deterioration begins in these areas, causing cracks and cracks. Similarly, in the case shown in FIG. 6, twisting occurs in the beam 21, and the support part 22
There are cracks in the. Similarly, in the case shown in FIG. 7, twisting occurs in the shell 23, and cracks appear from the support portion 24. These structures have the disadvantage that not only the material is easily damaged, but also the linearity of the Kerr displacement characteristic of the damper is poor due to large torsion. Further, in the structure shown in FIG. 6, if we take out the shaded part 25, only one side is supported, so it has a natural resonance only in this part. There is a problem in that this natural resonance occurs at a large level and deteriorates the acoustic performance of the speaker. Furthermore, in the structure shown in FIG. 7, the beam is spiral-shaped and connects the outer and inner annular parts 14, so when the voice coil 1o oscillates, a force in the rotational direction 26 acts, and the voice coil 10 is correctly rotated. It also had the disadvantage of not being able to hold.

In view of the above-mentioned drawbacks, the present invention suppresses the occurrence of twisting in the beam, has extremely small natural resonance at the beam, and uses a punched damper to move the voice coil only in the vertical direction, with no force acting in the rotational direction. The present invention provides a speaker that supports a coil.

Means for Solving the Problems In order to solve these problems, the present invention provides a structure that connects the outer annular part that is fixed to the frame of the punched damper and the inner annular part that is fixed to the voice coil bobbin. The cantilever, which is easy to change, has the cylindrical part, and the double-branch, which is easy to move in the vertical direction, has nine parts arranged in series, and all nine parts of the cantilever are connected by a ring.A punched damper with this configuration This structure supports the voice coil.

Function: With the above configuration, the cantilever beam, whose length can easily change during vibration, and the double beam, which moves in the vertical direction, are connected in series, so there is almost no twisting in the beam, and there is little concentration of stress, resulting in high durability. It has excellent fatigue resistance, and furthermore, it only follows the vertical movement of the voice coil and does not exert any force in the rotational direction. In addition, all the parts of the cantilever beam where natural resonance is likely to occur are connected in a circular ring, and moreover, they are directly connected to the inner ring part that is fixed to the voice coil bobbin.
The size of the natural resonance in that part is extremely small, and its effect on the acoustic performance of the speaker is 61-.

There aren't many.

EXAMPLES Below, the speaker of the present invention will be described with reference to the drawings. The overall structure of the speaker is the same as that shown in FIG. 4, so a description thereof will be omitted here.

FIG. 1 shows a plan view of a punched damper 11 of a speaker according to an embodiment of the present invention.

In FIG. 1, 27 is an outer annular portion that is fixed to the frame, 28 is an inner annular portion that is fixed to the bobbin 12 of the voice coil 1o, and a shaded portion 29 is supported by the inner annular portion 28 with a cantilever. , these cantilever beams 29 are all connected by a ring 3o. The mesh line part 31 is a double-sided beam, and the outer annular part 27
It is supported by a cantilever beam 29 and connected in series via a ring 30. The punched damper 11 having this structure supports the voice coil 10i to constitute a speaker.

Next, the operation of the punched damper 11 of the speaker configured as described above will be explained. FIG. 2 is an illustration showing a state in which the punched damper 11 and voice coil bobbin 12 of the speaker of the present invention are fixed. When an input signal is applied to the speaker and the voice coil 10 oscillates, the dimension of the damper movable part must become longer. Therefore, when the voice coil 10 moves downward, the cantilevered portion 29 of the stamped damper 11 in a stationary state bends in the direction of the arrow a as shown to the person. Further, when the voice coil 10 moves upward, it bends in the direction of the arrow C as shown in C to increase the size of the damper movable part.

Since there is a cantilever beam 29 whose dimensions can be easily changed in this way, the cantilever beam 29 only undergoes deflection, almost no twisting, and there is no part where stress is concentrated. On the other hand, as shown in FIG. 3, the operation of the double-supporting beam 31 is such that the double-supporting beam 31 in a stationary state deforms into shapes A and H and moves.

Since this double-supported beam 31 is connected in series with the above-mentioned cantilever beam 29, this punched damper 11 only moves in the vertical direction, and there is no movement that would rotate the voice coil 10 at all. Furthermore, the deflection of the cantilevered beam 29 and the double-sided beam 31 is caused by the movement of this damper, and no twisting occurs in the beams, so the Kerr displacement characteristics of this Dunno (-) have extremely excellent linearity.

Next, to explain using FIG. 1, the cantilever beam 29, where natural resonance is likely to occur, is supported by the inner ring 28, and all of the cantilevers 929 are connected by the ring 3o.
The degree of occurrence of natural resonance is extremely small, and there is almost no deterioration in the acoustic performance of the speaker.

Effects of the Invention As described above, the present invention provides a speaker in which a voice coil is supported by a punched damper, in which an outer annular portion that is fixed to the frame of the stamped damper and an inner annular portion that is fixed to the voice coil bobbin are fully connected. However, by arranging the cantilever beam whose length can be easily changed and the double-branch beam part which can easily move up and down in series, and by connecting all the cantilever beam parts with a ring, the quality is reliable. It is possible to construct a speaker with high linearity, excellent linearity, and good acoustic performance, and its practical effects are impressive.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a punched damper of a speaker according to an embodiment of the present invention, and FIG. Refer to Figure 3, the spring umbrella is an explanatory diagram of the same operation, Figure 4 is a cross-sectional view of the structure of a speaker in which a voice coil is supported by a punched damper, Figures 6 and 7 are plan views of the punched damper of a conventional speaker, FIG. 8 is a sectional view showing the voice coil supported by a punched damper. 6... Magnetic circuit, 6... Frame, 8
...Diaphragm, 9...Magnetic gap, 1
0...Voice coil, 11...Punching damper, 27...Outer annular portion, 28...
...Inner ring part, 29...Cantilever is shi, 30.
...Encircle, 31...Both holding is shi. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5 Figure π Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] The structure that connects the outer annular part that is fixed to the frame and the inner annular part that is fixed to the voice coil bobbin connects the cantilever beam part, which can easily change the length, and the double-branch beam part, which can easily move in the vertical direction, in series. The speaker has a voice coil supported by a punched damper with a cantilevered section connected by a ring.