JP2016111504A - Speaker damper and speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker damper and speaker not to be easily damaged even when large sound is output.SOLUTION: A speaker damper (10) includes a circular arcuate plate having thickness t0. The circular arcuate plate includes: an inner peripheral side edge part (10a) adhering to a voice coil bobbin (13); and a flat part (10c) extending from the inner peripheral side edge part (10a) toward the outer peripheral side of the circular arcuate plate. The flat part (10c) includes at least one of a chevron shape portion (a1) and a valley portion (b1) that are concentrically formed. The height (t1) of the chevron shape portion (a1) is equal to or smaller than the thickness t0 of the circular arcuate plate. The depth (t2) of the valley portion (b1) is equal to or smaller than the thickness t0 of the circular arcuate plate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a speaker damper and a speaker.

  In the speaker, a damper is widely used to support the voice coil.

  For example, Patent Document 1 discloses a damper having a corrugation structure. Such a damper is an annular plate having concentric and alternating peaks and valleys.

JP 2008-131180 A

  By the way, an improvement in output is required for a speaker. When a loud sound is generated in the speaker disclosed in Patent Document 1, the damper may be damaged by receiving a large force from the voice coil bobbin. In particular, a large stress was generated on the inner peripheral side of the damper, and the inner peripheral side was easily damaged.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide a speaker damper that is difficult to be damaged even when a loud sound is output, and a speaker using the same.

Therefore, the present invention provides
Comprising an annular plate having a thickness t0;
The annular plate is
An inner peripheral edge to be bonded to the voice coil bobbin;
A flat portion extending from the inner peripheral edge toward the outer peripheral side of the annular plate,
The flat part has at least one of a peak part and a valley part formed concentrically,
The height of the peak is the same as or smaller than the thickness t0 of the front annular plate,
The depth of the valley portion is the same as or smaller than the thickness t0 of the front annular plate, and provides a speaker damper.

  According to the present invention, it is possible to provide a speaker damper and a speaker that are not easily damaged even when a loud sound is output.

FIG. 1 is a cross-sectional view of the speaker according to the first embodiment. FIG. 2 is a cross-sectional perspective view of the damper according to the first embodiment. FIG. 3 is a cross-sectional view of a main part of the speaker according to the first embodiment. FIG. 4 is a cross-sectional view of the damper according to the first embodiment. FIG. 5 is a cross-sectional view of a main part of the damper according to the first embodiment. FIG. 6 is a cross-sectional view of a main part of the damper according to the first embodiment. FIG. 7 is a graph showing the stress at each part of the damper of the example. FIG. 8 is a cross-sectional perspective view of a damper of a comparative example. FIG. 9 is a graph showing the stress at each part of the damper of the comparative example.

Embodiment 1 FIG.
(Overall structure)
The speaker and the speaker damper according to the first embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the speaker according to the first embodiment. FIG. 2 is a cross-sectional perspective view of the damper according to the first embodiment. FIG. 3 is a cross-sectional view of a main part of the speaker according to the first embodiment.

  As shown in FIG. 1, the speaker 100 includes a damper 10, a first frame 11, a second frame 12, a voice coil bobbin 13, a cap 14, a diaphragm 15, an edge 16, and a magnetic circuit device. 18 and a voice coil 19.

  The first frame 11 is a conical cylindrical body, and the second frame 12 is a dish-like body having a hole near the center. The second frame 12 has a side wall 12a protruding from the outer edge and a flange 12b protruding from the side wall 12a. The first frame 11 and the second frame 12 are joined or integrated with each other to form a bowl-shaped body. Each of the first frame 11 and the second frame 12 is made of a material having mechanical strength necessary to maintain the configuration of the speaker 100, for example, a material such as metal or resin.

  The edge 16 is an annular 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 the traveling direction of the sound generated by the speaker 100, which is the Z direction in FIG. The edge 16 is installed along the outer end portion of the first frame 11.

  The diaphragm 15 is a conical cylindrical body that is disposed inside the first frame 11 and the second frame 12 that are joined or integrated, and is connected to the inner end of the edge 16. The diaphragm 15 is supported by the first frame 11 via the edge 16. The diaphragm 15 is an annular body when viewed from the front of the speaker 100. The diaphragm 15 is made of a material such as resin, paper, or metal.

  Referring to FIG. 1 together with FIG. 2, the damper 10 is an annular plate having a corrugation structure. For example, the inner peripheral edge 10a, the flat portion 10c, the undulating portion 10d, and the outer peripheral edge 10b. Including. The damper 10 is formed by press molding using a mold in a state where a cloth is impregnated with a resin. Examples of such a resin include a phenol resin and a polyamide resin. The damper 10 preferably has a predetermined thickness t0. The damper 10 is disposed inside the second frame 12, and the outer peripheral side edge portion 10 b of the damper 10 is attached to the side wall of the second frame 12. The inner peripheral side edge portion 10a, the flat portion 10c, the undulating portion 10d, and the outer peripheral side edge portion 10b are concentrically connected to each other in this order from the inner peripheral side toward the outer peripheral side. When viewed from the front of the speaker 100, the inner peripheral edge 10a, the flat portion 10c, the undulating portion 10d, and the outer peripheral edge 10b are all annular.

  The inner peripheral edge 10a is recessed behind the speaker (here, in the −Z direction) in order to hold an adhesive (described later). The inner peripheral edge 10a is bonded to the voice coil bobbin 13 with this adhesive.

The flat portion 10c extends from the inner peripheral edge portion 10a toward the outer peripheral side. The flat part 10c has at least one of the peak part a1 and the trough part b1 which are formed concentrically. The undulating portion 10d extends from the flat portion 10c toward the outer peripheral side. The undulating portion 10d has at least one of a crest and a trough formed concentrically. The flat portion 10c and the undulating portion 10d include at least one peak portion a1, a2, a3, ..., an (n is a natural number), ..., and at least one valley portion b1, b2, b3, ..., bm. (M is a natural number),... Alternately from the inner peripheral edge 10a toward the outer peripheral edge 10b. In the damper 10 shown in FIG. 2, n is 6 and m is 5. The flat part 10c includes at least one of mountain parts a1,..., An ₁ (n ₁ is a natural number) and valley parts b1,..., Bm ₁ (m ₁ is a natural number). The undulating portion 10d includes at least one of a mountain portion an ₁ +1,... And a valley portion bm ₁ +1,. In the flat part 10c, the height difference between the peak part a1, ... and the valley part b1, ... should be smaller than the height difference between the peak part an, ... and the valley part bn, ... included in the undulating part 10d. . The flat portion 10c may be referred to as a small undulating portion, and the undulating portion 10d may be referred to as a large undulating portion.

  The outer peripheral edge 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 frame 12. The damper 10 is supported by the frame 12 by bonding the supported surface E1 and the flange 12b. Further details of the damper 10 will be described later.

  Referring to FIG. 1 again, the voice coil bobbin 13 is a cylindrical body, and is made of, for example, a material such as resin, metal, or paper. The voice coil bobbin 13 is disposed inside the first frame 11 and the second frame 12 and is disposed so as to penetrate the diaphragm 15. As shown in FIG. 3, the voice coil bobbin 13 is bonded to the inner end portion of the diaphragm 15 through the bonding portion 17 and bonded to the inner peripheral edge portion 10 a of the damper 10 through the bonding portion 17. The adhesion part 17 is formed by accumulating an adhesive on the inner peripheral side edge part 10a and solidifying 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 cap 14 is disposed on the diaphragm 15 so as to cover the front end of the voice coil bobbin 13.

  The magnetic circuit device 18 includes a yoke 181, magnets 182 a and 182 b, and a plate 183.

  The yoke 181 has a cylindrical part 181a and a flange part 181b. The cylindrical portion 181 a extends in front of the speaker 100 (here, the Z direction) and is inserted inside the voice coil bobbin 13. The voice coil bobbin 13 is a component 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 181a. The flange 181b is formed in a disk shape when viewed from the back of the speaker 100. The yoke 181 is made of a magnetic material such as pure iron or steel, for example.

  The magnets 182a and 182b are annular bodies when viewed from the front of the speaker 100. The cylindrical portion 181a of the yoke 181 is inserted through the holes of the magnets 182a and 182b. The magnet 182a is placed on the flange 181b so as not to contact the cylindrical portion 181a, and the magnet 182b is placed on the magnet 182a. The magnets 182a and 182b are made of a ferrite magnet, an alnico magnet, a neodymium magnet, a samarium cobalt magnet, or the like.

  The plate 183 is an annular body when viewed from the front surface of the speaker 100. The cylindrical portion 181a of the yoke 181 is inserted through the plate 183 hole. The plate 183 is placed on the magnet 182b to form a magnetic gap with the cylindrical portion 181a. The plate 183 is made of the same type of material as the yoke 181. The magnets 182a and 182b and the plate 183 may be bolted to the flange portion 181b. The plate 183 may be separated without contacting the second frame 12.

  The lower magnetic field formed by the magnets 182a and 182b passes through the flange portion 181b of the yoke 181 and travels toward the cylindrical portion 181a. The upper magnetic field is directed toward the plate 183. The magnetic circuit device 18 forms a magnetic circuit that passes through the flange portion 181b, the cylindrical portion 181a, and the plate 183. In order to arrange the voice coil 19 at a predetermined position of the magnetic circuit device 18, the mechanical properties of the damper 10 may be set.

  The voice coil 19 is formed by winding a conductive 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 yoke 181. The voice coil 19 is electrically connected to an amplifier (not shown) or the like and is supplied with an electrical signal.

(Details of damper)
Next, details of the damper 10 will be described with reference to FIGS. 4 to 6. FIG. 4 is a cross-sectional view of the damper according to the first embodiment. 5 and 6 are cross-sectional views of main parts of the damper according to the first embodiment.

  In the damper 10 shown in FIG. 4, the flat portion 10 c and the undulating portion 10 d include a peak portion a 1, a 2, a 3, a 4, a 5, a 6 and a trough portion b 1, b 2, b 3, b 4, b 5 It has alternately from the side edge part 10a toward the outer peripheral side edge part 10b. When the voice coil bobbin 13 (see FIG. 3) vibrates in the front-rear direction of the speaker 100, the peaks a1 to a6, the valleys b1 to b5, and the inner peripheral edge 10a receive force. Since the shape of the inner peripheral side edge portion 10a is fixed by the adhesive portion 17, it is less likely to be damaged than the peak portions a1 to a6 and the valley portions b1 to b5.

  As shown in FIG. 5, specifically, the flat portion 10c is a range from the inner end a0 of the inner peripheral edge portion 10a to a point c1 that is a length r0 away from the outer peripheral edge portion 10b. It has a length r0 in the ten radial directions. The undulating portion 10d is a range from the point c1 to the end d1 (see FIG. 4) on the outer peripheral edge portion 10b side in the radial direction of the damper 10. Here, the point c1 is between the valley part b1 and the peak part a2. Accordingly, the flat portion 10c includes a peak portion a1 and a valley portion b1, while the undulating portion 10d includes peak portions a2 to a6 and valley portions b2 to b5.

  As shown in FIG. 6, the damper 10 has a predetermined thickness t0, the peak portion a1 has a height t1, and the valley portion b1 has a depth t2. Specifically, the height t1 of the peak portion a1 is determined from the lower main portion of the damper 10 from the virtual surface E2 having the same height as the supported surface E1 of the outer peripheral side edge portion 10b and the flange 12b of the second frame 12. It corresponds to the distance to the surface. Further, the depth t2 of the trough b1 corresponds to the distance from the virtual surface E2 to the upper main surface of the damper 10. The height t1 of the peak portion a1 is equal to or less than the thickness t0 of the damper 10. Further, the depth t2 of the valley b1 is equal to or less than the thickness t0 of the damper 10.

  On the other hand, it is preferable that the height of the peaks a2 to a6 is higher than the height t1 of the peaks a1, and the depth of the valleys b2 to b5 is deeper than the depth t2 of the valley b1. Further, when the heights of the peaks a2 to a6 are large as well as the thickness t0 of the damper 10, and the depths of the valleys b2 to b5 are also large as the thickness t0 of the damper 10, the height difference between the peaks a1 and the valleys b1 is It is preferable because it is surely smaller than the height difference between the peaks a2 to a6 and the valleys b2 to b5.

  Further, the radial length r0 of the flat portion 10c is preferably equal to or less than the radial length Wd / 6 of the damper 10. The radial length Wd (see FIG. 2) of the damper 10 is the length from the inner peripheral edge 10a to the outer peripheral edge 10b of the damper 10 in the radial direction. Further, the radial length r0 of the flat portion 10c is preferably equal to or less than the radial length Wd / 12 of the damper 10. On the other hand, the radial length r0 of the flat portion 10c may be 10 mm or less. It should be noted that the radial length r0 of the flat portion 10c is equal to or less than the radial length Wd / 12 of the damper 10 or Wd / 6, and the radial length r0 of the flat portion 10c is equal to or less than 10 mm. The relationship will be described later.

  For convenience of explanation, the height direction of the damper is defined, but the vertical direction of the damper corresponds to the front-rear direction of the speaker. Specifically, the upward direction of the damper corresponds to the front direction of the speaker. The downward direction corresponds to the rear direction of the speaker. Even if the orientation of the speaker changes, the correspondence between the vertical direction of the speaker and the front-back direction of the damper does not change. For example, even if the speaker is installed facing downward, the front direction of the speaker corresponds to the upward direction of the damper.

(Speaker operation)
Next, the operation of the speaker will be described.
Referring again to FIG. 1, an electric signal for generating sound from the speaker 100 is supplied to the voice coil 19. Then, the voice coil 19 generates a moment due to magnetism by the magnetic circuit device 18, and the voice coil bobbin 13 receives the moment of the voice coil 19, and moves in the front-rear direction (here, Z direction, −Z direction) of the speaker 100. Move. Due to the operation of the voice coil bobbin 13, the vibration plate 15 vibrates and is transmitted to a medium around the vibration plate 15 to generate sound.

  In a state where the sound generation of the speaker is stopped, the damper 10 holds the voice coil bobbin 13 after the operation so as to return it to a predetermined position of the magnetic circuit device 18. Therefore, the damper 10 receives a reaction force due to the holding of the voice coil bobbin 13, and stress is generated inside the damper 10. When the sound output of the speaker 100 is large, the stress generated inside the damper 10 is also large.

  However, in the damper 10, the height of the peak portion is the same as or smaller than the thickness t0 of the annular plate, and the depth of the valley portion is the same as or smaller than the thickness t0 of the annular plate. The stress generated on the side is small. Therefore, even if the loudspeaker 100 outputs a loud sound, the damper 10 receives a large stress but is not easily damaged. Further, the speaker 100 having the damper 10 can output a louder sound because the damper 10 is not easily damaged.

(Analysis result of Example)
Next, with reference to FIG. 7 to FIG. 9, analysis results of the example according to the first embodiment and the comparative example will be described. FIG. 7 is a graph showing the stress at each part of the damper of the example. FIG. 8 is a cross-sectional perspective view of a damper of a comparative example. FIG. 9 is a graph showing the stress at each part of the damper of the comparative example.

  In the embodiment, a damper corresponding to the damper 10 is used. In the comparative example, a damper corresponding to the damper 910 shown in FIG. 8 was used. The damper 910 has the same configuration as the damper 10 except for the flat portion 910c and the outer peripheral edge portion 910b. The flat part 910c has a peak part 9a1 and a valley part 9b1, and the height difference between the peak part 9a1 and the valley part 9b1 is between the peak parts a2 to 6n and the valley parts b2 to b5 included in the undulating part 10d. Same or larger compared to elevation difference. Unlike the outer peripheral edge 10b, the outer peripheral edge 910b has a side wall extending upward at the edge, but the outer peripheral edge 910b has little influence on the stress described later.

  In the example and the comparative example, the stress generated in the portion in the radial direction of the damper was analyzed. As an experimental condition, a plurality of values within a range of 0.1N to 10N were used as inputs given to the inner periphery of the damper. FIG. 7 shows the results of the example, and FIG. 9 shows the results of the comparative example.

  As shown in FIG. 7, the stress values of the peaks a1 to a6 and the valleys b1 to b5 are all below 11 MPa, and there is no significant difference.

  As shown in FIG. 9, the stress value of the peak portion 9a1 was significantly higher than any other peak portions a2 to a6 and valley portions b2 to b5. The stress value of the valley portion 9b1 is higher than the stress value of the valley portion b1 (see FIG. 7).

  In the example, compared with the comparative example, the stress values of the inner peripheral part, for example, the peak part a1 and the valley part b1 are small. Therefore, even if an Example and a comparative example are each incorporated in a speaker and a loud sound is output to a speaker, it is thought that an Example is hard to damage compared with a comparative example. Furthermore, the loudspeaker incorporating the example can output a louder sound than the loudspeaker incorporating the comparative example.

(Specific examples of speakers)
Next, a specific example of a speaker suitable for the damper according to the first embodiment will be described.

  A speaker having a diameter of 13 cm or more and 30 cm or less is likely to cause damage to a damper when the output of the speaker is increased as compared with a speaker having a diameter of less than 13 cm. Therefore, in view of the effect of the damper 10 described above, the damper 10 is particularly suitable for a speaker having a diameter of 13 cm or more and 30 cm or less than a speaker having a diameter of less than 13 cm. The speaker aperture Ws (see FIG. 1) corresponds to the diameter of the edge 16.

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

When the speaker has a diameter Ws [cm], the voice coil has a diameter Wv [mm] (see FIG. 1), and the damper has a radial length Wd [mm], the radial length of the flat portion 10c. r0 is determined by using the following calculation formula.
Wd = (10 Ws−Wv) / 2 (Calculation formula)

  Further, the diameter Wv of the voice coil is often almost determined according to the aperture Ws of the speaker. For example, a speaker with a diameter of 13 cm uses a voice coil with a diameter of 20 mm. In a speaker having a diameter of 16 cm, a voice coil having a diameter of 25 to 30 mm is used. In addition, a voice coil having a diameter of 45 to 50 mm is used for a speaker having a diameter of 25 cm. Further, a voice coil having a diameter of 50 to 65 mm is used for a speaker having a diameter of 30 cm.

Here, Tables 1 and 2 below show the results of obtaining Wd / 6 and Wd / 12 in speakers having apertures of 13 cm, 16 cm, 25 cm, and 30 cm. In the speaker having a diameter of 13 cm, the diameter of the voice coil to be used is one kind. For convenience of explanation, the diameter is treated as the voice coil minimum diameter Wvmin in Table 1.

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

  As described above, according to the speaker damper according to the first embodiment, the height of the peak portion is the same as or smaller than the thickness t0 of the annular plate, and the depth of the valley portion is the same as the thickness t0 of the annular plate, or Because it is small, even if it outputs a loud sound, it is hard to be damaged.

  Further, according to the speaker damper according to the first embodiment, the length in the radial direction of the flat portion is such that the distance from the inner peripheral edge is within 1/6 of the radial length Wd of the damper. Even if a loud sound is output, it is more difficult to damage.

  Further, according to the speaker damper according to the first embodiment, the length of the flat portion in the radial direction is within 10 mm from the inner peripheral side edge, so that even if a loud sound is output, it is more reliable. Hard to damage.

  On the other hand, according to the speaker according to the first embodiment, since the speaker damper according to the first embodiment is provided, it is difficult to be damaged even if a loud sound is output. Therefore, since it is not necessary to suppress the output due to the risk of damage to the damper, a loud sound can be output.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Damper 10a Inner peripheral edge 10c Flat part a1, ..., an mountain part b1, ..., bn Valley part 13 Voice coil bobbin

Claims (4)

Comprising an annular plate having a thickness t0;
The annular plate is
An inner peripheral edge to be bonded to the voice coil bobbin;
A flat portion extending from the inner peripheral edge toward the outer peripheral side of the annular plate,
The flat part has at least one of a peak part and a valley part formed concentrically,
The height of the peak is the same as or smaller than the thickness t0 of the annular plate,
The depth of the trough is the same as or smaller than the thickness t0 of the annular plate. 2. The speaker damper according to claim 1, wherein a radial length of the flat portion is within 1/6 of a radial length Wd of the annular plate. 2. The speaker damper according to claim 1, wherein a length of the flat portion in a radial direction is within 10 mm.   A speaker provided with the damper for speakers of any one of Claims 1-3.

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