CN105681978B - Damper for speaker and speaker - Google Patents

Abstract

the invention provides a damper for a speaker and a speaker, which are difficult to damage even if a large sound is output. Is a loudspeaker damper (10) comprising an annular plate having a thickness (t 0). The annular plate includes: an inner peripheral side edge portion (10a) bonded to the voice coil bobbin (13), and a flat portion (10c) extending from the inner peripheral side edge portion (10a) to the outer peripheral side of the annular plate. The flat portion (10c) has at least one of a peak portion (a1) and a trough portion (b1) formed in concentric circles. The height (t1) of the peak (a1) is equal to or less than the thickness (t0) of the annular plate. The depth (t2) of the valleys (b1) is equal to or less than the thickness (t0) of the annular plate.

Description

Damper for speaker and speaker

Technical Field

the invention relates to a damper for a speaker and a speaker.

Background

In a speaker, damper is widely used for supporting a voice coil.

For example, patent document 1 discloses an elastic wave having a corrugated structure. Such a damper is an annular plate having peaks and valleys alternately in a concentric circle shape.

Patent document 1: japanese patent laid-open No. 2008-131180.

Disclosure of Invention

[ problem to be solved by the invention ]

however, there is a demand for a speaker to improve output. When the speaker disclosed in patent document 1 produces a large sound output, the damper may be damaged by receiving a large force from the voice coil bobbin. In particular, a large stress is generated on the inner peripheral side of the damper, and the inner peripheral side is easily broken.

the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a damper for a speaker which is less likely to be damaged even when a large sound is output, and a speaker having the damper.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

Accordingly, the present invention provides a damper for a speaker, comprising an annular plate having a thickness t0, wherein,

The annular plate includes:

An inner peripheral edge portion bonded to the voice coil bobbin; and

a flat portion extending from the inner peripheral side edge portion toward an outer peripheral side of the annular plate;

The flat portion has at least one of first crest portions and first trough portions formed in concentric circles,

The height of the first peak is equal to or less than the thickness t0 of the annular plate,

The depth of the first valley portion is equal to or less than the thickness t0 of the annular plate.

In addition, the invention also provides a loudspeaker with the elastic wave.

[ Effect of the invention ]

according to the present invention, it is possible to provide a damper for a speaker and a speaker which are less likely to be damaged even when a large sound is output.

drawings

Fig. 1 is a sectional view of a speaker according to embodiment 1;

Fig. 2 is a sectional perspective view of the damper according to embodiment 1;

fig. 3 is a sectional view of a main part of a speaker according to embodiment 1;

Fig. 4 is a sectional view of the damper according to embodiment 1;

Fig. 5 is a sectional view of a main part of the damper according to embodiment 1;

Fig. 6 is a sectional view of a main part of the damper according to embodiment 1;

FIG. 7 is a graph showing the stress at each part of the damper in the example;

FIG. 8 is a sectional perspective view of an elastic wave of a comparative example;

Fig. 9 is a graph showing the stress of each part of the damper in the comparative example.

Detailed Description

Embodiment mode 1

(Overall Structure)

A speaker and a damper for a speaker according to embodiment 1 will be described with reference to fig. 1 to 3. Fig. 1 is a sectional view of a speaker according to embodiment 1. Fig. 2 is a sectional perspective view of the damper according to embodiment 1. Fig. 3 is a sectional view of a main part of a speaker according to embodiment 1.

As shown in fig. 1, the speaker 100 includes: damper 10, first support 11, second support 12, voice coil bobbin 13, cover 14, diaphragm 15, suspended edge 16, magnetic circuit device 18, and voice coil 19.

the first holder 11 is a conical cylindrical body, and the second holder 12 is a disk-shaped body having a hole near the center. The second bracket 12 has a side wall 12a protruding from the outer edge and a flange 12b protruding from the side wall 12 a. The first bracket 11 and the second bracket 12 are joined to or integrated with each other, and have a bowl shape. Each of the first bracket 11 and the second bracket 12 is formed of a material having mechanical strength necessary for holding the structure of the speaker 100, for example, a material such as metal, resin, or the like.

The suspension edge 16 is a ring-shaped member when viewed from the front of the speaker 100, and has a shape protruding toward the front of the speaker 100 in the cross section of the speaker 100. Here, the front of the speaker 100 is a traveling direction of the sound generated by the speaker 100, and is a Z direction in fig. 1. The hanging edge 16 is provided along the outer end of the first bracket 11.

The diaphragm 15 is a conical cylindrical body which is disposed inside between the first bracket 11 and the second bracket 12 joined or integrated, and is connected to the inside end portion of the suspended edge 16. The diaphragm 15 is supported by the first support 11 via a suspension edge 16. The diaphragm 15 has a ring shape when viewed from the front of the speaker 100. The diaphragm 15 is formed of, for example, resin, paper, metal, or the like.

Referring to fig. 1 and 2 in combination, the damper 10 is a ring-shaped plate having a corrugated structure, and includes, for example, an inner peripheral side edge portion 10a, a flat portion 10c, a wavy portion 10d, and an outer peripheral side edge portion 10 b. The damper 10 is formed by press molding using a mold in a state in which a cloth is impregnated with a resin. Examples of such a resin include a phenol resin and a polyamide resin. The spider 10 preferably has a predetermined thickness t 0. The spider 10 is disposed inside the second bracket 12, and the outer peripheral side edge portion 10b of the spider 10 is adhered to the side wall of the second bracket 12. The inner peripheral edge 10a, the flat portion 10c, the undulation portion 10d, and the outer peripheral edge 10b are concentrically connected to each other in this order from the inner periphery side to the outer periphery side. The inner peripheral edge portion 10a, the flat portion 10c, the undulation portion 10d, and the outer peripheral edge portion 10b are all annular as viewed from the front of the speaker 100.

The inner peripheral side edge portion 10a is recessed toward the rear of the speaker (here, the-Z direction) to hold an adhesive (described later). The inner peripheral side edge portion 10a is bonded to the voice coil bobbin 13 by the adhesive.

The flat portion 10c extends from the inner peripheral edge portion 10a toward the outer peripheral side. The flat portion 10c has at least one of a crest a1 and a trough b1 formed in concentric circles. The wavy portion 10d extends from the flat portion 10c toward the outer peripheral side. The wavy portion 10d has at least one of a crest portion and a trough portion formed in concentric circles. The flat portions 10c and the wave portions 10d alternately have at least one crest portion a1, a2, a3, …, an (n is a natural number), …, and at least one trough portion b1, b2, b3, …, …, bm (m is a natural number), … from the inner peripheral edge portion 10a toward the outer peripheral edge portion 10 b. In the damper 10 shown in fig. 2, n is 6 and m is 5. The flat portion 10c includes at least one of peaks a1, …, an1(n1 is a natural number), and valleys b1, …, bm1(m1 is a natural number). The undulation 10d includes at least one of peaks an1+1, …, and valleys bm1+1, …. The difference in height between the peaks a1, … and the valleys b1, … in the flat portion 10c may be smaller than the difference in height between the peaks an, … and the valleys bn, … included in the wave portion 10 d. The flat portion 10c may also be referred to as a small undulation portion, and the undulation portion 10d may also be referred to as a large undulation portion.

The outer peripheral edge portion 10b has a supported surface E1 on the rear side of the speaker, and the supported surface E1 is bonded to the flange 12b of the second bracket 12. The damper 10 is supported by the holder 12 by the supported surface E1 being bonded to the flange 12 b. Further details of the damper 10 will be described later.

Referring again to fig. 1, the voice coil bobbin 13 is a cylindrical body, and is formed of a material such as resin, metal, or paper. The voice coil bobbin 13 is disposed inside between the first and second brackets 11 and 12, and is disposed to penetrate the diaphragm 15. As shown in fig. 3, the voice coil bobbin 13 is bonded to the inner end of the diaphragm 15 via a bonding portion 17, and is bonded to the inner peripheral edge portion 10a of the damper 10 via the bonding portion 17. The adhesive portion 17 is formed by accumulating an adhesive in the inner peripheral side edge portion 10a and curing it. The voice coil bobbin 13 is supported by the second frame 12 via the damper 10 so as to be movable in the front-rear direction of the speaker.

The cover 14 is disposed on the diaphragm 15 in such a manner as to cover the front end of the voice coil bobbin 13.

the magnetic circuit device 18 includes a core 181, magnets 182a and 182b, and an iron piece 183.

The core 181 has a cylindrical portion 181a and a flange portion 181 b. The cylindrical portion 181a extends forward (in this case, in the Z direction) of the speaker 100 and is inserted into the voice coil bobbin 13. The voice coil bobbin 13 is a member for connecting the voice coil 19 and the diaphragm 15 and the like. The flange portion 181b is provided on the rear side of the speaker 100 in the cylindrical portion 181 a. The flange portion 181b is formed in a circular plate shape when viewed from the rear surface of the speaker 100. The core 181 is made of a magnetic material such as pure iron or steel.

The magnets 182a, 182b are annular bodies when viewed from the front of the speaker 100. The cylindrical portion 181a of the core 181 passes through the holes of the magnets 182a and 182 b. The magnet 182a is placed on the flange portion 181b without contacting the cylindrical portion 181a, and the magnet 182b is placed on the magnet 182 a. The magnets 182a, 182b are formed of ferrite magnets, alnico magnets, neodymium magnets, samarium-cobalt magnets, or the like.

The iron piece 183 is a ring-shaped body as viewed from the front of the speaker 100. The cylindrical portion 181a of the core 181 passes through the hole of the iron piece 183. The iron piece 183 is disposed above the magnet 182b to form a magnetic gap with the cylindrical portion 181 a. The iron piece 183 is formed of the same type of material as the core 181. The magnets 182a and 182b and the iron piece 183 may be fixed to the flange 181b by bolts. The iron piece 183 may be spaced from the second bracket 12 without contacting it.

The lower magnetic field formed by the magnets 182a and 182b passes through the flange 181b of the core 181 and is directed toward the cylindrical portion 181 a. The upper magnetic field is directed towards the iron sheet 183. The magnetic circuit device 18 forms a magnetic circuit passing through the flange portion 181b, the cylindrical portion 181a, and the iron piece 183. The mechanical characteristics of the damper 10 and the like may be set so that the voice coil 19 is disposed at a predetermined position of the magnetic circuit device 18.

The voice coil 19 is formed by winding a wire around the outer peripheral surface of the rear portion of the voice coil bobbin 13. The voice coil 19 is disposed on the outer peripheral surface of the rear portion of the voice coil bobbin 13 so as not to contact the core 181. The voice coil 19 is electrically connected to an amplifier (not shown) to obtain supply of an electric signal.

(details of the Ejection wave)

Next, details of the damper 10 will be described with reference to fig. 4 to 6. Fig. 4 is a cross-sectional view of the damper according to embodiment 1. Fig. 5 and 6 are sectional views of a main part of the damper according to embodiment 1.

In the damper 10 shown in fig. 4, the flat portions 10c and the wavy portions 10d alternately have crests a1, a2, a3, a4, a5, a6, and troughs b1, b2, b3, b4, b5 from the inner peripheral edge portion 10a toward the outer peripheral edge portion 10 b. When the voice coil bobbin 13 (refer to fig. 3) vibrates in the front-rear direction of the speaker 100, the crests a 1-a 6, the troughs b 1-b 5, and the inner peripheral side edge portion 10a are subjected to forces. The inner peripheral side edge portion 10a is less likely to be damaged than the crests a1 to a6 and the troughs b1 to b5 because its shape is fixed by the adhesive portion 17.

specifically, as shown in fig. 5, the flat portion 10c is a range from the inner end a0 of the inner peripheral edge portion 10a to a point c1, the point c1 is a point separated from the inner end a0 of the inner peripheral edge portion 10a toward the outer peripheral edge portion 10b by a length r0, and the flat portion 10c has a length r0 in the radial direction of the damper 10. The wavy portion 10d is a range from the point c1 to an end d1 (see fig. 4) on the outer peripheral edge 10b side in the radial direction of the bullet wave 10. Here, point c1 is between valley b1 and peak a 2. Thus, the flat portion 10c includes the crests a1 and the troughs b1, while the wavy portion 10d includes the crests a2 to a6 and the troughs b2 to b 5.

As shown in FIG. 6, the bullet wave 10 has a predetermined thickness t0, peak a1 having a height t1, and valley b1 having a depth t 2. Specifically, the height t1 of the peak a1 corresponds to the distance from the imaginary plane E2 having the same height as the supported surface E1 to the lower main surface of the damper 10, and the supported surface E1 is located between the outer peripheral edge 10b and the flange 12b of the second bracket 12. The depth t2 of the valley portion b1 corresponds to the distance from the virtual plane E2 to the upper main surface of the damper 10. The height t1 of the peak a1 is equal to or less than the thickness t0 of the damper 10. The depth t2 of the valley portion b1 is equal to or less than the thickness t0 of the damper 10.

on the other hand, the heights of the peaks a 2-a 6 are preferably greater than the height t1 of the peak a1, and the depths of the valleys b 2-b 5 are preferably greater than the depth t2 of the valley b 1. Further, if the heights of the peaks a 2-a 6 are greater than the thickness t0 of the damper 10 and the depths of the valleys b 2-b 5 are greater than the thickness t0 of the damper 10, the height difference between the peaks a1 and the valleys b1 is surely smaller than the height difference between the peaks a 2-a 6 and the valleys b 2-b 5, which is preferable.

The radial length r0 of the flat portion 10c is preferably 1/6 or less of the radial length Wd of the damper 10. The radial length Wd (refer to fig. 2) of the damper 10 is a length from the inner peripheral edge portion 10a to the outer peripheral edge portion 10b of the damper 10 in the radial direction. The radial length r0 of the flat portion 10c is preferably 1/12 or less of the radial length Wd of the damper 10. On the other hand, the radial length r0 of the flat portion 10c may be 10mm or less. The relationship between the radial length r0 of the flat portion 10c being equal to or less than 1/12 of the radial length Wd of the damper 10, or equal to or less than 1/6 of Wd, and the radial length r0 of the flat portion 10c being equal to or less than 10mm will be described later.

For convenience of explanation, a height direction is defined in the elastic wave, and an up-down direction in the elastic wave corresponds to a front-rear direction in the speaker, specifically, an upward direction in the elastic wave corresponds to a forward direction in the speaker, and a downward direction in the elastic wave corresponds to a rearward direction in the speaker. Even if the orientation of the speaker is changed, the correspondence between the front-back direction in the speaker and the up-down direction in the damper does not change. For example, even if the speaker is disposed downward, the forward direction in the speaker corresponds to the upward direction in the bounce.

(operation of speaker)

Next, the operation of the speaker will be described.

Referring again to fig. 1, the voice coil 19 is supplied with an electric signal for causing the speaker 100 to generate sound. Then, the voice coil 19 generates a moment by the magnetism generated by the magnetic circuit device 18, and the voice coil bobbin 13 moves in the front-rear direction (here, the Z direction and the-Z direction) of the speaker 100 by the moment of the voice coil 19. By the action of the voice coil bobbin 13, the diaphragm 15 vibrates, and the vibration is transmitted to the medium around the diaphragm 15, thereby generating sound.

in a state where the sound of the speaker stops being generated, the damper 10 holds the voice coil bobbin 13 after the operation and returns it to a predetermined position of the magnetic circuit device 18. Accordingly, the damper 10 receives a force of reaction generated by holding the voice coil bobbin 13, and a stress is generated in the damper 10. If the sound output of the speaker 100 is large, the stress generated inside the damper 10 is also large.

however, in the damper 10, since the height of the crests in the flat portion on the inner peripheral side is equal to or less than the thickness t0 of the annular plate and the depth of the troughs is equal to or less than the thickness t0 of the annular plate, the stress generated on the inner peripheral side of the damper 10 is small. Therefore, even if the speaker 100 outputs a large sound, the damper 10 is hardly damaged even if it is subjected to a large stress. Further, since the damper 10 is hard to be damaged, the speaker 100 having the damper 10 can output a larger sound.

(analysis results of examples)

Next, the results of the analysis of the example according to embodiment 1 and the comparative example thereof will be described with reference to fig. 7 to 9. Fig. 7 is a graph showing the stress of each part of the damper in the example. Fig. 8 is a sectional perspective view of the damper of the comparative example. Fig. 9 is a graph showing the stress of each part of the damper in the comparative example.

in the embodiment, an elastic wave corresponding to the elastic wave 10 is used. In the comparative example, an elastic wave corresponding to the elastic wave 910 shown in fig. 8 was used. The damper 910 has the same structure as the damper 10 except for the flat portion 910c and the outer peripheral edge portion 910 b. The flat portion 910c has peaks 9a1 and valleys 9b1, and the height difference between the peaks 9a1 and the valleys 9b1 is equal to or greater than the height difference between the peaks a2 to 6n and the valleys b2 to b5 included in the wave portion 10 d. The outer peripheral edge portion 910b has a side wall extending upward at its edge, unlike the outer peripheral edge portion 10b, but the outer peripheral edge portion 910b has little influence on stress described later.

In the examples and comparative examples, the stress generated at a portion in the radial direction of the elastic wave was analyzed. As experimental conditions, a plurality of values in the range of 0.1N to 10N were used as inputs to the inner peripheral portion of the damper. The results of the example are shown in fig. 7, and the results of the comparative example are shown in fig. 9.

as shown in fig. 7, the stress values of the peaks a1 to a6 and the valleys b1 to b5 were all lower than 11MPa, and there was no significant difference.

As shown in FIG. 9, the stress value of peak 9a1 is very high compared to all of the other peaks a 2-a 6 and valleys b 2-b 5. The stress value of the trough portion 9b1 is higher compared to the stress value of the trough portion b1 (refer to fig. 7).

in the examples, stress values at the inner peripheral side portions, for example, the crests a1 and the troughs b1 were smaller than in the comparative examples. So that it is conceivable: the embodiment and the comparative example are respectively assembled into a speaker and make the speaker generate a large sound, and the embodiment is also difficult to break compared with the comparative example. Also, the speaker assembled with the embodiment can output a larger sound than the speaker assembled with the comparative example.

(concrete example of speaker)

Next, a specific example of a speaker to which the damper according to embodiment 1 is applied will be described.

In comparison with a speaker having a diameter smaller than 13cm, a speaker having a diameter of 13cm or more and 30cm or less is likely to break a damper when the output of the speaker is increased. Therefore, in view of the above-described effects of the damper 10, the damper 10 is particularly suitable for a speaker having a diameter of 13cm or more and 30cm or less, compared to a speaker having a diameter of less than 13 cm. The speaker caliber Ws (see fig. 1) corresponds to the diameter of the suspended edge 16.

here, the radial length r0 of the specific flat portion 10c of the speaker having a diameter of 13cm or more and 30cm or less is calculated.

In the case where the speaker has a diameter Ws cm, the voice coil has a diameter Wv mm (refer to fig. 1), and the damper has a radial length Wd mm, the radial length r0 of the flat portion 10c can be obtained by the following calculation formula.

wd ═ 10Ws-Wv)/2 … (calculation formula)

The diameter Wv of the voice coil is generally determined depending on the diameter Ws of the speaker. For example, in a speaker having a diameter of 13cm, a voice coil having a diameter of 20mm is used. A voice coil having a diameter of 25 to 30mm is used for a speaker having a diameter of 16 cm. In addition, a voice coil with a diameter of 45-50 mm is used in a speaker with a diameter of 25 cm. In addition, a voice coil with a diameter of 50-65 mm is used in a loudspeaker with a diameter of 30 cm.

here, Wd/6 and Wd/12 were calculated for speakers having calibers of 13cm, 16cm, 25cm and 30cm, and the results are shown in tables 1 and 2 below. In the speaker having a diameter of 13cm, the diameter of the voice coil that can be used is 1, and therefore, for convenience of explanation, the diameter thereof is set as the minimum voice coil diameter Wvmin in table 1.

[ TABLE 1 ]

[ TABLE 2 ]

As shown in tables 1 and 2, among the speakers having a caliber of 13cm or more and 30cm or less, Wd/6 in the speaker having a caliber of 16cm or less and Wd/12 in the speaker having a caliber of more than 16cm have values close to 10 mm. Accordingly, in the speaker having a diameter of 13cm or more and 30cm or less, the radial length r0 of the flat portion 10c is preferably 10mm or less.

As described above, according to the damper for a speaker according to embodiment 1, since the height of the peak portion in the flat portion on the inner peripheral side is equal to or smaller than the thickness t0 of the annular plate and the depth of the valley portion is equal to or smaller than the thickness t0 of the annular plate, the damper is less likely to be damaged even if a large sound is output.

Further, according to the damper for a speaker according to embodiment 1, since the length in the radial direction of the flat portion, that is, the distance from the inner peripheral edge portion is within 1/6 of the length Wd in the radial direction of the damper, it is more reliably less likely to be damaged even if a large sound is output.

Further, according to the damper for a speaker according to embodiment 1, since the length in the radial direction of the flat portion, that is, the distance from the inner peripheral side edge portion is within 10mm, even if a loud sound is output, it is more reliably less likely to be damaged.

On the other hand, according to the speaker of embodiment 1, since the damper for the speaker of embodiment 1 is included, it is difficult to break even if a large sound is output. Accordingly, there is no need to suppress the output with fear of damage of the damper, and therefore, a large sound can be output.

The present invention is not limited to the above-described embodiments, and can be modified as appropriate within a scope not departing from the gist.

Description of the symbols

10 elastic wave

10a inner peripheral edge portion 10c flat portion

a1, …, an peaks b1, …, bn valleys

13 voice coil framework

Claims (3)

1. A damper for a loudspeaker, comprising an annular plate having a thickness t0, wherein,

The annular plate includes:

an inner peripheral edge portion bonded to the voice coil bobbin;

A flat portion extending from the inner peripheral side edge portion toward an outer peripheral side of the annular plate; and

A peripheral side edge portion having a supported surface bonded to a flange of a bracket of the speaker;

The flat portion has at least one of first crest portions and first trough portions formed in concentric circles,

the height of the first peak is equal to or less than the thickness t0 of the annular plate,

The depth of the first valley portion is equal to or less than the thickness t0 of the annular plate,

The height is a distance from an imaginary plane having the same height as the supported surface to the lower main surface of the bullet wave,

The depth is a distance from the imaginary plane to an upper main surface of the bullet wave,

The flat portion has a radial length that is within 1/6 of the radial length Wd of the annular plate.

2. The loudspeaker damper of claim 1,

The annular plate further includes an undulation portion extending from the flat portion toward an outer peripheral side of the annular plate and having at least one of second crest portions and second valley portions,

The height of the second peak is greater than the height of the first peak,

The depth of the second valley portion is greater than the depth of the first valley portion.

3. a speaker comprising the damper for a speaker according to claim 1 or 2.