JP4765131B2 - Damper and speaker using the same - Google Patents

Description

  The present invention relates to a damper used for a speaker for sound reproduction, and a speaker using the damper.

  The damper for the speaker supports the vibration system including the diaphragm and the voice coil bobbin at a predetermined position, and in order to enable good vibration, the inner periphery is joined to the voice coil bobbin, and the outer periphery is a frame or It joins to a magnetic circuit etc., and a support movable part connects an inner peripheral part and an outer peripheral part. In conventional dampers, corrugation dampers with corrugated corrugations at the movable support part are often used. Molds are made using a prepreg impregnated with a resin such as phenol resin or melamine resin in a woven fabric such as cotton yarn or aramid fiber yarn. It is manufactured by heating and molding. When the speaker includes a circular diaphragm, the inner and outer peripheral portions of the damper and the corrugation of the support movable portion are often formed concentrically.

As for the shape and material of the corrugation damper, since various contradictory performances such as ensuring linearity of amplitude displacement with respect to a small input signal and amplitude limitation with respect to a large input signal are required, various studies have been conventionally made. For example, in order to improve stiffness symmetry and amplitude symmetry, it includes a plurality of corrugations having crests and troughs, and the pitch between the outermost valleys is larger than the pitch between the other valleys, and the outermost circumference There is a damper in which the height of the peak portion is higher than the height of the other peak portion, and the radius of the peak portion at the outermost periphery is smaller than the radius of the other peak portion (Patent Document 1). Also, change the height of the corrugation peak concentrically provided on the damper in the radial direction so that the rate of change is higher in order from both the fixed ends on the voice coil side and frame side, and the middle neighborhood is the highest. There is a damper formed (Patent Document 2). Alternatively, there is a speaker in which the inner peripheral waveform of the damper is formed larger than the outer peripheral waveform, or the inner peripheral waveform width of the damper is wider than the outer peripheral waveform (Patent Document 3).

Japanese Patent No. 3835211 (FIGS. 1 and 2) Japanese Utility Model Publication No. 57-185297 (FIGS. 4 and 5) JP 2003-111191 A (FIGS. 1 and 2)

  However, none of the prior art dampers is sufficient. In particular, the damper formed so that the height of the corrugation peak in the radial direction as in Patent Document 2 is changed to be the highest in the middle vicinity is necessary even if it is advantageous in ensuring linearity of amplitude displacement. There is a problem that it is difficult to obtain the amplitude. Further, if the amplitude is to be ensured, there are cases where improvement cannot be achieved at the same time in terms of symmetry of the front-rear amplitude, and there is a problem that it is difficult to design efficiently when designing the support movable part of the damper. In addition, before and after the front and rear amplitude, when the diaphragm of the speaker vibrates, the side where the damper is attached is the rear side, and the side where the diaphragm is exposed is the front side.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention relates to a damper and a speaker using the damper, and to ensure linearity of amplitude displacement with respect to a small input signal and to provide a large input. An object of the present invention is to provide a damper and a speaker that can satisfy both contradictory performances such as amplitude limitation on a signal, have good symmetry in front-rear amplitude, and reduce distortion.

The damper of the present invention includes an inner peripheral portion that is joined to the voice coil bobbin, an outer peripheral portion that is joined to the frame, and a support movable portion that connects the inner peripheral portion and the outer peripheral portion. A flat portion extending from the flat portion, and a corrugation portion extending from the flat portion and having a plurality of odd peaks and an even number of valleys one less than the plurality of odd numbers , wherein the flat portion defines a reference plane. The distance dx in the radial direction between two adjacent ridges of the corrugation part decreases from the inner peripheral part side toward the outer peripheral part side while being provided on a plane that is higher than the outer peripheral part to be defined by the dimension h0. The distance dy in the radial direction between one ridge and each valley located on both sides of the ridge except for the most inner and outermost ridges is the inner rim side and the outer rim side. At the outermost peak The distance dn in the radial direction between the inner peripheral edge of the outer peripheral part is larger than the distance dm in the radial direction between the outermost peak part and the valley part located on the inner peripheral side, and the peak of the corrugation part. The height dimension h from the reference plane of the part and the valley is the highest at the central part of the corrugation part, and gradually decreases toward the inner peripheral part side or the outer peripheral part side.

  Preferably, in the damper of the present invention, the radial distance da between the outer peripheral end of the flat portion and the innermost ridge is such that the innermost ridge and the valley located on the outer rim thereof are Is less than or equal to ½ of the radial distance db.

Also preferably, the damper of the present invention, ridges defining the corrugation portion, 5 or 7 in which.

  Preferably, the speaker of the present invention includes any one of the dampers of the present invention.

  The operation of the present invention will be described below.

  The damper of the present invention is a damper having a corrugation part in which the movable support part has a plurality of peak parts and valley parts, and an inner peripheral part joined to the voice coil bobbin, an outer peripheral part joined to the frame, and an inner peripheral part And a movable support part that connects the outer peripheral part, and the movable support part includes a flat part extending from the inner peripheral part in addition to the corrugation part. Here, since the flat and identical reference plane is defined to include the outer peripheral portion, the flat portion is provided on a plane that is higher than the outer peripheral portion defining the reference plane by a dimension h0. As a result, even if the damper of the present invention is a flat damper, the inner peripheral portion and the outer peripheral portion have a shape that is not included on the same reference plane. In addition, it is appropriate that the number of peak portions defining the corrugation portion is 5 or more and 7 or less.

  Here, the radial distance dx between two adjacent peak portions of the corrugation portion decreases from the inner peripheral portion side toward the outer peripheral portion side, and the innermost peripheral portion and the outermost peripheral peak portion are reduced. Except for this, the radial distance dy between one peak and each valley located on both sides thereof is equal on the inner peripheral side and the outer peripheral side. In addition, the radial distance dn between the outermost ridge and the inner peripheral end of the outer rim is the radial distance between the outermost ridge and the valley located on the inner rim. greater than dm.

  That is, the damper according to the present invention is basically a damper in which the radial distance dx between two adjacent peaks is reduced from the inner periphery toward the outer periphery. The distance dy in the radial direction between the peak and the respective valleys located on both sides thereof is such that the shape of the slope to the valleys on both sides is substantially symmetrical when viewed from the side. It is equal on the part side. The stress that deforms the movable support part of the damper is less likely to be transmitted from the inner peripheral side close to the voice coil where the driving force is generated toward the outer peripheral side where the damper is fixed. Improved. Therefore, the damper of the present invention is advantageous in ensuring the linearity of the amplitude displacement, and a damper with good linearity and low distortion is realized. As a result, the speaker equipped with the speaker damper of the present invention has excellent sound quality and durability. Excellent.

  Further, in the damper of the present invention, the height dimension h from the reference plane of the peak and valley of the corrugation part is the highest at the central part of the corrugation part, and gradually decreases toward the inner peripheral part side or the outer peripheral part side. . Therefore, the movement of the central part of the corrugation part having the highest height from the reference plane of the peak part and the valley part can be made smooth. Therefore, it is possible to realize not only the linearity of the amplitude displacement and the improvement of the longitudinal symmetry but also the amplitude limitation for the large input signal.

  Specifically, the radial distance da between the outer peripheral edge of the flat portion and the innermost peak is the radius between the innermost peak and the valley located on the outer periphery. A damper that is ½ or less the directional distance db is more preferable. The cross-sectional shape of the movable support portion of the damper of the present invention is basically a flat damper, and the radial distances da, db, dn that define the crests and troughs on the innermost circumferential side and the outermost circumferential side, and , Dm in the relationship as described above, even when the amplitude displacement of the voice coil increases so that the innermost crest and the outermost crest greatly deform, the corrugation unit In addition to ensuring linearity of amplitude displacement and improving front-rear symmetry, it is possible to realize amplitude limitation for large input signals.

  The damper of the present invention can achieve the contradictory performances of ensuring linearity of amplitude displacement with respect to a small input signal and limiting the amplitude with respect to a large input signal. Further, the damper has good symmetry in front and rear amplitude and less distortion. And a speaker using the same can be provided.

  The damper according to the present invention and the speaker using the damper are movable in support of the above-described object of the present invention by connecting the inner peripheral portion joined to the voice coil bobbin, the outer peripheral portion joined to the frame, and the inner peripheral portion and the outer peripheral portion. And the movable support part includes a flat part extending from the inner peripheral part, and a corrugation part extending from the flat part and having a plurality of peaks and a plurality of valleys, the flat part being The distance dx in the radial direction between two adjacent ridges of the corrugation part is provided from the inner peripheral part side to the outer peripheral part side. The distance dy in the radial direction between one ridge and each valley located on both sides of the ridge except for the innermost and outermost ridges is the inner rim side. And the outer circumference side are equal The radial distance dn between the outermost peak and the inner peripheral edge of the outer periphery is greater than the radial distance dm between the outermost peak and the valley located on the inner periphery. The height h from the reference plane of the peaks and valleys of the corrugation part is the highest in the central part of the corrugation part, and gradually decreases toward the inner peripheral part or outer peripheral part. ,It was realized.

  Hereinafter, a damper and a speaker using the same according to preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

  FIG. 1 is a cross-sectional view for explaining a speaker 10 using a damper 1 according to a preferred embodiment of the present invention, in which the left half of the axial symmetry is omitted. The speaker 10 includes a damper 1, a magnetic circuit 11 having a magnetic gap, a frame 12 connected to the magnetic circuit 11, a bobbin 14 around which a voice coil 13 is wound, a diaphragm 15 connected to the bobbin 14, and vibration. The edge 16 which supports the outer peripheral end of the board 15 so that vibration is possible, and the dust cap 17 connected so that the edge part of the bobbin 14 may be covered are provided. The frame 12 of the present embodiment is a frame obtained by press-molding an iron plate, and has a ring-shaped damper base 12a formed of resin between the outer periphery 3 of the damper 1 described later.

  The damper 1 arranges the voice coil 13 in the magnetic gap of the magnetic circuit 11 and constitutes a vibration system of the speaker together with the voice coil 13, bobbin 14, diaphragm 15, edge 16, and dust cap 17. The damper 1 supports and fixes the bobbin 14 so that the diaphragm 15 can vibrate without being distorted by the driving force generated according to the audio signal current flowing through the voice coil 13. In addition, the speaker 10 of a present Example is a speaker provided with the outer-magnet-type magnetic circuit 11 with a diameter of 12 cm.

  FIG. 2 is a diagram illustrating the damper 1 of the present embodiment. 2A is a cross-sectional view of the damper 1 in the radial direction, and FIG. 2B is a characteristic diagram for explaining the displacement characteristics of the damper 1 with respect to the load. In the graph of the displacement characteristic, the vertical axis is displayed as an absolute value of displacement and the load value with respect to the negative displacement amount is displayed in order to make it easy to confirm the longitudinal symmetry. In these graphs, in the case of the forward direction (positive displacement amount) and the case of the backward direction (negative displacement amount), the front-back symmetry is better as they overlap, and the front-back symmetry is not so good that they do not overlap and shift. Represents.

  The damper 1 is based on a prepreg impregnated with a phenol resin on a woven fabric in which a plurality of warp yarns and weft yarns of cotton and aramid resin fibers are substantially orthogonal to each other. It is a damper that is formed. The damper 1 includes an inner peripheral portion 2 having a joining portion joined to the bobbin 14 and a falling contour portion, an outer peripheral portion 3 having a planar joining portion joining the frame 12 and a rising contour portion, The support movable part 4 which connects the periphery 2 and the outer periphery 3 is provided. The joint between the inner peripheral part 2 and the outer peripheral part 3 is a part to which an adhesive is applied and fixed. The support movable portion 4 includes a flat portion 5 extending from the inner peripheral portion 2 and a corrugation portion 6 extending from the flat portion 5 and having a plurality of peak portions 6a and a plurality of valley portions 6b. .

  The flat portion 5 of the support movable portion 4 is provided on a plane that is higher than the outer peripheral portion 3 that defines the reference plane 3a by a dimension h0 (= 0.2 mm). That is, in the damper 1 of the present embodiment, five peak portions 6a that are convex rolls appear on the front side (upper side in the illustrated cross-sectional shape), while four trough portions 6b that are concave rolls when viewed from the front side. Although it has corrugations that appear and form a so-called flat damper shape, the inner peripheral portion 2 is not included in the reference plane 3a and has a stepped shape. The dimensions of the damper 1 of this embodiment are such that the outer diameter 3 of the outer peripheral portion 3 is about 100.0 mm, the inner diameter of the flat portion 5 is about φ27.3 mm, the outer diameter of the flat portion 5 and the inner diameter of the corrugation portion 6 is about The outer diameter of the corrugation part 6 and the inner diameter of the outer peripheral part 3 are about φ93.0 mm.

  In the damper 1, the radial distance dx between two adjacent peak portions 6 a of the corrugation portion 6 decreases from the inner peripheral portion 2 side toward the outer peripheral portion 3 side, and is the innermost peripheral mountain. With the exception of the portion 6ai and the outermost ridge 6ao, the radial distance dy between one ridge 6a and the respective valleys 6b located on both sides thereof is the inner rim and the outer rim. Corrugation portions 6 are formed so as to be equal to each other. That is, as shown in FIG. 2A, the radial distance dx between two adjacent peaks is dx1 (= 8.2 mm)> dx2 (= 7.1 mm)> dx3 (= 6.2 mm). )> Dx4 (= 5.4 mm), and decreases from the inner peripheral side toward the outer peripheral side. Further, for example, in the second peak portion 6a from the inner peripheral portion 2 side, the third peak from the inner peripheral portion 2 side is set so that the inner peripheral portion side and the outer peripheral portion side are equally dy1 (= 3.8 mm). In the peak portion 6a, the fourth peak portion 6a from the inner peripheral portion 2 side is equal to dy2 (= 3.3 mm) on the inner peripheral portion side and the outer peripheral portion side. The corrugation unit 6 is formed so as to be equal to dy3 (= 2.9 mm) on the side.

  Further, in the damper 1, the radial distance da (= 1.5 mm) between the outer peripheral end of the flat portion 5 and the peak portion 6ai on the innermost peripheral portion 2 side is the peak portion on the innermost peripheral portion 2 side. It is ½ or less of the radial distance db (= 4.4 mm) between 6ai and the valley 6b located on the outer peripheral side thereof. Further, the radial distance dn (= 3.0 mm) between the peak portion 6ao on the outermost peripheral portion 3 side and the inner peripheral end of the outer peripheral portion 3 is the peak portion 6ao on the outermost peripheral portion 3 side and the inner peripheral side thereof. It is larger than the distance dm (= 2.5 mm) in the radial direction between the valley portion 6b located at the position.

  In the damper 1, the height dimension h of the peak portion 6 a and the valley portion 6 b of the corrugation portion 6 from the reference plane 3 a varies between about −0.8 mm to +1.7 mm, and the center of the corrugation portion 6 It becomes the highest at the part, and becomes lower sequentially as it reaches the inner peripheral part 2 side or the outer peripheral part 3 side. Specifically, in the damper 1, in the radial cross-sectional shape of the corrugation part 6, the roll height of each roll forming the five peak parts 6 a is ha1 ( = 1.7 mm), and the height becomes ha2 (= 1.5 mm) and ha3 (= 0.8 mm) in order as the inner peripheral flat part 5 or the outer peripheral part 2 is reached. Similarly, the roll height of each roll forming the five valley portions 6b with the height dimension h from the reference plane 3a is hb2 (= 0.8 mm) at the valley portion 6b in the central portion of the corrugation portion 6. As it reaches the deepest inner flat portion 5 or outer peripheral portion 2, hb1 (= 0.5 mm) is gradually decreased. The height of the valley portion 6b from the reference plane 3a includes the depth of the valley portion 6b viewed from the reference plane 3a, and is displayed as an absolute value.

  In addition, the damper 1 of a present Example is provided with the corrugation part 6 in which five peak parts 6a which are convex rolls appear to the front side, and four valley parts 6b which are concave rolls appear from the front side. As long as it has the above relationship. Preferably, for a radial distance dy between one peak 6a and each valley 6b located on both sides thereof, db is approximately 1.05 to 1.30 times dy1, and dy1 is dy2. It may be in the range of about 1.05 times to 1.30 times, dy2 about 1.05 times to 1.30 times dy3, and dy3 about 1.05 times to 1.30 times dym.

  FIG. 3 is a diagram for explaining the damper 21 of the first comparative example. 3A is a cross-sectional view of the damper 21 in the radial direction, and FIG. 3B is a characteristic diagram illustrating the displacement characteristics of the damper 21 with respect to the load. The damper 21 of the comparative example 1 includes the damper 1 of the present embodiment, the inner peripheral portion 22 and the outer peripheral portion 23 having substantially the same shape and size, and the corrugation portion 26 of the support movable portion 24 having substantially the same shape and size. This is a comparative example in which the height dimension h0 of the flat portion 25 of the support movable portion 24 is 0, and the flat portion 25 is provided on the same plane as the outer peripheral portion 23 that defines the reference plane 3a. Specifically, the damper 21 of the comparative example 1 is a flat damper having no step. In addition, about the damper 21 of the comparative example 1, description and illustration are abbreviate | omitted about the part which is common in a material and another present Example.

  FIG. 4 is a diagram illustrating a damper 31 of another comparative example 2. 4A is a cross-sectional view of the damper 31 in the radial direction, and FIG. 4B is a characteristic diagram illustrating the displacement characteristics of the damper 31 with respect to the load. The damper 31 of the comparative example 2 is a flat damper in which a flat portion 35 is provided on the same plane as the outer peripheral portion 33 that defines the reference plane 3a, like the damper 21 of the previous comparative example. This is a comparative example when the distance d (= 3.5 mm) in the radial direction between 36a and the valley 36b is constant. For the damper 31 of Comparative Example 2, the description and illustration of materials and other parts common to the present embodiment are omitted.

  Further, FIG. 5 is a diagram for explaining a damper 41 of another comparative example 3. FIG. 5A is a cross-sectional view of the damper 41 in the radial direction, and FIG. 5B is a characteristic diagram illustrating the displacement characteristics of the damper 41 with respect to the load. The damper 41 of the comparative example 3 is a flat damper in which a flat portion 45 is provided on the same plane as the outer peripheral portion 43 that defines the reference plane 3a, like the damper 21 and the damper 31 of the previous comparative example. This is a comparative example in which the height h (= 2.4 mm) of the peak part 46a and the valley part 46b of the corrugation part 46 is further constant from the damper 31 of the example. In addition, about the damper 41 of the comparative example 3, description and illustration are abbreviate | omitted about the part which is in common with a material and another present Example.

  As can be seen by comparing the characteristic diagrams for explaining the displacement characteristics with respect to the load in FIGS. 2B to 5B, the damper 1 of the present embodiment has the dampers 21, 31, 41 of the other comparative examples 1-3. Compared to the above, the linearity of the amplitude displacement is improved, and the front-rear symmetry is also improved particularly when the load is large and the amplitude is larger than 10 mm. In the damper 1 of the present embodiment, the radial distance dx between two adjacent ridges 6a of the corrugation unit 6 decreases from the inner peripheral side toward the outer peripheral side, and the innermost peripheral side Except for the peak portion 6ai and the peak portion 6ao on the outermost peripheral side, the radial distance dy between one peak portion 6a and the respective valley portions 6b located on both sides thereof is the inner peripheral portion side and the outer peripheral portion side. When viewed from one ridge 6a, the shape of the slope to the valley 6b on both sides is substantially symmetric.

  In addition, the damper 1 which is a flat damper having a level difference, even when the amplitude displacement of the voice coil increases such that the innermost ridge 6ai and the outermost ridge 6ao are greatly deformed, The movement of the corrugation unit can be smoothed, and not only the linearity of the amplitude displacement can be secured and the front-rear symmetry can be improved, but also the amplitude limitation for a large input signal can be realized. The stress that deforms the support movable portion 4 of the damper 1 is less likely to be transmitted from the inner peripheral side near the voice coil where the driving force is generated toward the outer peripheral side to which the damper 1 is fixed. , It will be improved. As a result, when the damper 1 with good linearity and low distortion is used, the speaker 10 of the present invention can be made excellent in sound quality and durability. In particular, when the loudspeaker diaphragm is greatly displaced due to a large audio signal current, the front-rear symmetry is improved, so that even-order distortion represented by second-order distortion in harmonic distortion can be greatly reduced. it can.

  FIG. 6 is a diagram illustrating a damper 51 according to another embodiment. 6A is a cross-sectional view of the damper 51 in the radial direction, and FIG. 6B is a characteristic diagram illustrating the displacement characteristics of the damper 51 with respect to the load. The damper 51 is the same as the damper 1 of the first embodiment in that it is heat-molded using a prepreg in which a woven fabric is impregnated with a resin as a base material, and a support movable portion that connects the inner peripheral portion 52 and the outer peripheral portion 53. 54, the support movable part 54 includes a corrugation part 56 having a plurality of peaks and valleys, a flat part 55 extending from the inner peripheral part 52, and a plurality of peaks extending from the flat part 55. Since the basic structure formed so as to include the portion 6a and the corrugation portion 56 having the plurality of valley portions 6b is the same, the description of the common portions is omitted.

  The flat portion 55 of the support movable portion 54 is provided on a plane that is higher by a dimension h0 (= 0.2 mm) than the outer peripheral portion 53 that defines the reference plane 53a. That is, in the damper 51 of the present embodiment, seven peak portions 56a that are convex rolls appear on the front side (upper side in the illustrated cross-sectional shape), while six trough portions 56b that are concave rolls when viewed from the front side. Corrugations appearing individually are provided, and a shape having a step is formed in which the inner peripheral portion 52 is not included in the same reference plane 53a even in a so-called flat damper shape.

  Also in the damper 51 of the present embodiment, the radial distance dx between two adjacent ridges 56a of the corrugation part 56 decreases from the inner peripheral part 52 side toward the outer peripheral part 53 side, and is the innermost part. Except for the circumferential ridge 56ai and the outermost ridge 56ao, the radial distance dy between one ridge 56a and the respective troughs 56b located on both sides thereof is the inner circumference and Corrugation portions 56 are formed so as to be equal on the outer peripheral side. That is, as shown in FIG. 6A, the radial distance dx between two adjacent peaks is dx1 (= 6.9 mm)> dx2 (= 6.0 mm)> dx3 (= 5.2 mm). )> Dx4 (= 4.5 mm)> dx5 (= 3.9 mm)> dx6 (= 3.4 mm), and becomes smaller from the inner peripheral side toward the outer peripheral side. Further, for example, in the second peak portion 56a from the inner peripheral portion 52 side, the third peak from the inner peripheral portion 52 side so that the inner peripheral portion side and the outer peripheral portion side are equally dy1 (= 3.2 mm). In the crest 56a, the fourth crest 56a from the inner peripheral portion 52 side is equal to dy2 (= 2.8 mm) on the inner peripheral portion side and the outer peripheral portion side. In the fifth peak portion 56a from the inner peripheral portion 52 side, dy4 (= 2.1 mm) is equal on the inner peripheral portion side and the outer peripheral portion side so that dy3 (= 2.4 mm) is equal on the side. In addition, in the sixth peak portion 56a from the inner peripheral portion 52 side, the corrugation portion 6 is formed so that the inner peripheral portion side and the outer peripheral portion side are equally dy5 (= 1.8 mm).

  Further, also in the damper 51, the distance da (= 1.2 mm) in the radial direction between the outer peripheral end of the flat portion 55 and the peak portion 56ai on the innermost peripheral portion 52 side is the peak portion on the innermost peripheral portion 52 side. It is 1/2 or less of the radial distance db (= 3.7 mm) between 56 ai and the trough portion 56 b located on the outer peripheral side thereof. In addition, the radial distance dn (= 1.8 mm) between the peak portion 56ao on the outermost peripheral portion 53 side and the inner peripheral end of the outer peripheral portion 53 is the peak portion 56ao on the outermost peripheral portion 53 side and its inner peripheral side. It is larger than the distance dm (= 1.6 mm) in the radial direction between the trough portion 56b located at the position.

  Also in the damper 51, the height dimension h of the peak portion 56a and the valley portion 56b of the corrugation portion 56 from the reference plane 3a varies between about −0.6 mm and +1.2 mm, and the center of the corrugation portion 56 It becomes the highest at the part, and becomes lower sequentially as it reaches the inner peripheral part 52 side or the outer peripheral part 53 side.

  Even in the damper 51 of this embodiment, even when the load is extremely large, the front-rear symmetry can be kept good. Therefore, the speaker using the damper 51 (not shown) is subjected to a large audio signal current, and the speaker Even in the case where the diaphragm is largely displaced, even-order distortion represented by second-order distortion among harmonic distortion can be suppressed small.

  In the damper 51 of the present embodiment, there are seven ridges that define the corrugation portion 56. However, even if there are three or nine concentric ridges, the number is 11 or more if it is an odd number. It may be. Even when the load is extremely large, the longitudinal symmetry can be kept good.

  The base material of the speaker damper of the present invention may be a woven or non-woven fabric of cotton and polyester fiber, or aramid fiber, and the resin to be impregnated may be phenol resin or melamine resin. The present invention is not limited to the material of the base material as long as the damper includes a thermosetting resin having corrugation.

  The damper of the present invention is not limited to a speaker using the same, but can be applied to other vibrators having a vibration system such as a damper and a voice coil, and electrodynamic electromechanical converters such as sensors. It is. The magnetic circuit may be joined to the inner periphery of the damper, and is suitable for a vibrator that vibrates the magnetic circuit.

It is sectional drawing explaining the speaker 10 using the damper 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the damper 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the damper 21 of a comparative example. (Comparative Example 1) It is a figure explaining the damper 31 of a comparative example. (Comparative Example 2) It is a figure explaining the damper 41 of a comparative example. (Comparative Example 3) It is a figure explaining the damper 51 by other preferable embodiment of this invention. (Example 2)

Explanation of symbols

1, 11, 21, 31, 41, 51 Damper 2 Inner peripheral portion 3 Outer peripheral portion 4 Support movable portion 5 Flat portion 6 Corrugation portion 10 Speaker 11 Magnetic circuit 12 Frame 13 Voice coil 14 Bobbin 15 Diaphragm 16 Edge

Claims (4)

An inner peripheral portion that is joined to the voice coil bobbin, an outer peripheral portion that is joined to the frame, and a support movable portion that connects the inner peripheral portion and the outer peripheral portion;
Corrugation in which the support movable part has a flat part extending from the inner peripheral part, a plurality of odd peaks extending from the flat part, and a plurality of even valleys one less than the odd number. And
The flat portion is provided on a plane that is higher than the outer peripheral portion defining the reference plane by a dimension h0;
The radial distance dx between two adjacent peak portions of the corrugation portion decreases from the inner peripheral portion side toward the outer peripheral portion side,
Except for the innermost and outermost ridges, the radial distance dy between one ridge and each of the valleys located on both sides of the ridge is the inner circumference and the ridge. It is equal on the outer periphery side,
The radial distance dn between the outermost ridge and the inner peripheral end of the outer rim is the radial direction between the outermost ridge and the valley located on the inner rim. Greater than the distance dm of
The height dimension h of the corrugation part from the reference plane of the peak part and the valley part is the highest at the central part of the corrugation part, and gradually decreases toward the inner peripheral part side or the outer peripheral part side.
Damper. A radial distance da between the outer peripheral end of the flat portion and the innermost peak portion is a radial direction between the innermost peak portion and the valley portion located on the outer peripheral side. Or less than a distance db of
The damper according to claim 1. The ridges defining the corrugations is four five or 7,
The damper according to claim 1 or 2.   The speaker provided with the damper in any one of Claim 1 to 3.