JP4505689B2 - 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).

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

  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 joins the voice coil bobbin, an outer peripheral portion that joins the frame, and a support movable portion that connects the inner peripheral portion and the outer peripheral portion, and the support movable portion includes a plurality of mountain portions. And a corrugation part having a valley part, an inner peripheral inclined part formed between an inner peripheral part and a peak or valley part on the innermost peripheral side of the corrugation part, an outer peripheral part and an outermost peripheral side of the corrugation part An outer peripheral inclined portion formed between the peak portion or the valley portion of the support movable portion, and the radial cross-sectional shape of the support movable portion is symmetric with respect to the normal defining the central portion of the corrugation portion, and the inner periphery The inner peripheral side end of the inclined part and the outer peripheral side end of the outer peripheral inclined part are planar and defined on the same reference plane, and the inner peripheral inclined part and the outer peripheral inclined part are at their height from the reference plane. Has a cross-sectional shape that gradually increases as it reaches the corrugation section. And the height from the peaks and valleys of the reference plane of the corrugations is highest in the central portion of the corrugation portion, becomes successively lower as the distance from the inner peripheral inclined portion or the outer peripheral inclined portion.

  Preferably, in the damper of the present invention, the ridge line defined by the line connecting the adjacent peak parts of the corrugation part of the support movable part and the valley ridge line defined by the line connecting the adjacent valley parts are the reference. The corrugation part is formed so as to be symmetric with respect to the plane.

  Preferably, in the damper of the present invention, the inner peripheral inclined portion and the outer peripheral inclined portion of the corrugation portion of the support movable portion are defined on a straight line obtained by extending a mountain ridge line or a valley ridge line.

  Preferably, in the damper according to the present invention, the distance between adjacent crests and troughs of the corrugation part of the support movable part is the largest near the central part of the corrugation part, and sequentially reaches the inner peripheral inclined part or the outer peripheral inclined part. Get smaller.

  Preferably, in the damper of the present invention, the inner peripheral portion and the outer peripheral portion are included on the reference plane.

  Preferably, in the damper of the present invention, the outer peripheral portion includes a connecting portion that extends from the outer peripheral side end portion of the outer peripheral inclined portion and connects to a joint portion that is not included in the reference plane.

  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 The support movable part includes an inner peripheral inclined part and an outer peripheral inclined part in addition to the corrugation part. Here, since the end portions of the inner peripheral inclined portion and the outer peripheral inclined portion that form both ends of the corrugation portion in the radial cross-sectional shape are defined on the same reference plane in a planar shape, the damper of the present invention is When the inner peripheral portion and the outer peripheral portion are included on the same reference plane, a so-called flat damper shape is formed. The damper according to the present invention is a damper having an outer peripheral portion extending from an outer peripheral side end portion of the outer peripheral inclined portion and connected to a joint portion with a frame not included in the reference plane. The connecting portion may form a rising portion of the rising damper or a falling portion of the falling damper.

  Here, the height from the reference plane of the ridges and valleys of the corrugation part of the support movable part, that is, the roll height of the roll forming the ridges and valleys of the corrugation part is highest in the central part of the corrugation part. , It gradually decreases as it reaches the inner peripheral inclined portion or the outer peripheral inclined portion. 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. The central part of the corrugation part is defined by a perpendicular bisector connecting the two end points of the corrugation part in the cross-sectional shape in the radial direction, and the perpendicular defining the central part of the corrugation part is the corrugation part. It becomes a reference for symmetry of the inner and outer peripheral sides of the cross-sectional shape.

  In the damper of the present invention, the inner peripheral inclined part formed between the inner peripheral part and the peak part or valley part on the innermost peripheral side of the corrugation part, and the peak part or valley on the outermost peripheral side of the outer peripheral part and the corrugation part. The outer peripheral inclined portion formed between the first and second portions is symmetrical with respect to the perpendicular defining the central portion of the corrugation portion. Since the height from the reference plane of the ridges and valleys of the corrugation part is lowered as it reaches the inner peripheral inclined part or the outer peripheral inclined part, as a result, the inner peripheral inclined angle defined by the inner peripheral inclined part, and Thus, a damper in which the outer peripheral inclination angle defined by the outer peripheral inclined portion is equal and reduced is realized.

  Since the cross-sectional shape of the support movable portion of the damper of the present invention is a shape close to a flat damper having flat portions on the inner peripheral side and the outer peripheral side, the inner peripheral inclined portion connected to both ends of the corrugation portion and the outer peripheral inclined portion By making the inner peripheral inclination angle and the outer peripheral inclination angle equal and small, the symmetry of the front-rear amplitude is improved. Preferably, the peak ridge line defined by the line connecting the adjacent peak parts of the corrugation part of the support movable part and the valley ridge line defined by the line connecting the adjacent valley parts are symmetrical with respect to the reference plane. Since the corrugation part is formed as described above, the symmetry of the front-rear amplitude can be ensured even when the amplitude displacement increases. In addition, an inner peripheral inclination part and an outer periphery inclination part may be prescribed | regulated on the straight line which extended the peak part ridgeline or the trough part ridgeline.

  Further, the distance between adjacent crests and troughs of the corrugation part of the support movable part, that is, the pitch between rolls of the corrugation part is the largest near the central part of the corrugation part, and reaches the inner peripheral inclined part or the outer peripheral inclined part. Accordingly, the linearity of the amplitude displacement and the symmetry of the front-rear amplitude can be achieved at the same time. In this case, in the central part of the corrugation part where the height from the reference plane of the peak part and the valley part is the highest, the angle of the slope connecting the peak part and the valley part is made small, that is, the slope connecting the rolls is laid down. Therefore, the movement of the corrugation unit 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.

  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 of the present invention and the speaker using the same are provided for the purpose of the present invention described above, in which the radial cross-sectional shape of the movable support portion of the damper is symmetrical with respect to the normal defining the central portion of the corrugation portion. The inner peripheral side end portion of the peripheral inclined portion and the outer peripheral end portion of the outer peripheral inclined portion are planar and defined on the same reference plane, and the height from the reference plane of the peak portion and valley portion of the corrugation portion is corrugation. This is realized by increasing the height at the center of the portion and gradually decreasing toward the inner peripheral inclined portion or the outer peripheral inclined portion.

  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. And an edge 16 that supports the outer peripheral end of the plate 15 so as to vibrate. The damper 1 arranges the voice coil 13 in the magnetic gap of the magnetic circuit 11 and constitutes the vibration system of the speaker together with the voice coil 13, the bobbin 14, the diaphragm 15, and the edge 16. 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 10 cm aperture.

  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 formed by using a prepreg impregnated with a phenol resin on a woven fabric in which a plurality of warp yarns and weft yarns of cotton and polyester fibers are substantially orthogonal to each other. Is a damper. 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. Moreover, the support movable part 4 is an inner peripheral inclination formed between a corrugation part 6 having a plurality of peak parts and valley parts, and an inner peripheral part 2 and a peak part 6ai on the innermost peripheral side of the corrugation part 6. Part 8, and outer peripheral inclined part 9 formed between outer peripheral part 3 and peak part 6ao on the outermost peripheral side of corrugation part 6.

  The inner peripheral side end portion 5 of the inner peripheral inclined portion 8 of the support movable portion 4 and the outer peripheral side end portion 7 of the outer peripheral inclined portion 9 are planar and defined on the same virtual reference plane 4a. Moreover, both the inner peripheral part 2 and the outer peripheral part 3 are prescribed | regulated on the reference plane 4a. 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. The corrugation which appears individually is provided, and the inner peripheral part 2 and the outer peripheral part 3, the corrugation part 6, the inner peripheral side end part 5 of the inner peripheral inclined part 8, and the outer peripheral side end part 7 of the outer peripheral inclined part 9 are flat. It is a flat damper that makes a good relationship. The dimensions of the damper 1 of this embodiment are as follows: the inner diameter φA of the inner peripheral portion 2 is about 39 mm, the outer diameter φB of the outer peripheral portion 3 is about 79 mm, the inner diameter of the inner peripheral inclined portion 8 is about φ44 mm, and the outer diameter of the outer peripheral inclined portion 9. Is about 74 mm, the inner diameter of the corrugation part 6 is about 47 mm, and the outer diameter of the corrugation part 6 is about 71 mm.

  In the damper 1, the height of each peak 6 a and valley 6 b of the corrugation unit 6 from the reference plane 4 a varies in a radial direction between about −0.65 mm and +0.81 mm, and the center of the corrugation unit 6 It is formed so that it becomes the highest at the part, and becomes gradually lower as it reaches the inner peripheral inclined part 8 or the outer peripheral inclined part 9. That is, in the damper 1, the roll height of each roll forming the five peak portions 6 a and the four valley portions 6 b is 0 at the central portion of the corrugation portion 6 in the radial cross-sectional shape of the corrugation portion 6. .81 mm is the highest, and gradually decreases to 0.65 mm, 0.49 mm, 0.32 mm, and 0.16 mm as it reaches the inner flat portion 5 or the outer flat portion 7. The height of the valley portion 6b from the reference plane 4a includes the depth of the valley portion 6b viewed from the reference plane 4a, and is displayed as an absolute value.

  In the damper 1, the inner peripheral inclined portion 8 and the outer peripheral inclined portion 9 are symmetric with respect to the normal 6 c that defines the central portion of the corrugation portion 6. The inner peripheral inclination angle 8δ defined by the inner peripheral inclined portion 8 and the outer peripheral inclination angle 9δ defined by the outer peripheral inclined portion 9 are angles at which the reference plane 4a and the inner peripheral inclined portion 8 or the outer peripheral inclined portion 9 intersect. , Each equal to about 6.1 degrees and a small angle. The perpendicular line 6c is a perpendicular bisector connecting the two end points of the corrugation unit 6 (joint points between the outer peripheral side end of the inner peripheral inclined part 8 and the inner peripheral side end of the outer peripheral inclined part 9). is there. In addition, a ridge line 6ra defined by a line connecting adjacent mountain parts 6a of the corrugation part 6 and a valley ridge line 6rb defined by a line connecting adjacent valley parts 6b are horizontal lines including the reference plane 4a. Are formed symmetrically in the front-rear direction. The mountain part ridge line 6ra and the valley part ridge line 6rb are straight lines used as auxiliary lines when designing the shape of the damper 1, and the inner peripheral inclined part 8 and the outer peripheral inclined part 9 of the corrugation part 6 extend the mountain part ridge line 6ra. Are defined on each straight line. In the damper 1 of this embodiment, the separation distance p1 between the adjacent peak portions 6a and valley portions 6b of the corrugation portion 6 is about 1.5 mm, and is equal between any adjacent peak portions 6a and valley portions 6b. .

  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 is a comparative example including the inner peripheral portion 22 and the outer peripheral portion 23 having substantially the same shape and size as the damper 1 of the present embodiment, and the corrugation portion 26 of the support movable portion 24 is different in shape. Specifically, in the corrugation part 26 of the damper 21 of the comparative example 1, the roll height of each roll forming the five peak parts 26a and the four valley parts 26b is changed in the radial cross-sectional shape. It is unified with a certain height (about 0.5mm) without. In the example and the comparative example, the conditions other than the shape of the corrugation unit 6 are substantially the same, but in the case of the damper 21 of the comparative example, the innermost peripheral peak part 26ai and the outermost peripheral peak part. Since the height of 26ao from the reference plane 4a is not low, it corresponds to the inner peripheral inclination angle 8δ defined by the inner peripheral inclined portion 8 and the outer peripheral inclination angle 9δ defined by the outer peripheral inclined portion 9 in the first embodiment. The angle is a large angle of about 36.9 degrees.

  In the damper 1 of the present embodiment, the height of each peak portion 6a and valley portion 6b of the corrugation portion 6 from the reference plane 4a is highest at the central portion of the corrugation portion 6, and the inner peripheral inclined portion 8 or the outer peripheral inclined portion. 9, the inner peripheral inclination angle 8δ and the outer peripheral inclination angle 9δ are set to small angles, so that the load is smaller than in the case of the comparative example 1. The displacement also increases, the linearity of the amplitude displacement is improved, and the longitudinal symmetry is improved as compared with Comparative Example 1 even when the load is large. Therefore, the speaker 10 using the damper 1 of this embodiment is improved in the vibration of the vibration system including the bobbin 14 joined to the inner peripheral portion 2, and becomes a speaker excellent in sound quality and durability. In particular, when the loudspeaker diaphragm is greatly displaced due to the addition of 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. 4 is a diagram illustrating a damper 31 according to another embodiment. 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 is common to 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 32 and the outer peripheral portion 33. 34, and the corrugation part 36 of the support movable part 34 is the highest at the center part, and has the same basic structure formed so as to gradually become lower toward the inner peripheral inclined part 38 or the outer peripheral inclined part 39. Since some things are common, description of common parts is omitted.

  In the damper 31 of this embodiment, six peak portions 36a that are convex rolls appear on the front side (upper side in the illustrated cross-sectional shape), while five valley portions 36b that are concave rolls appear from the front side. The inner peripheral portion 32, the outer peripheral portion 33, the inner peripheral end portion 35 of the inner peripheral inclined portion 38, and the outer peripheral end portion 37 of the outer peripheral inclined portion 39 are on the same reference plane 34a. It is a flat damper that has a flat relationship. Since the number of convex rolls is increased by one as compared with the case of the first embodiment, the roll corresponding to the perpendicular line 36c that defines the central portion of the corrugation portion 36 is a peak portion 36a as in the first embodiment. Instead, it is a valley 36b. The dimensions of the damper 31 of this embodiment are as follows: the inner diameter φA of the inner peripheral portion 32 is about 39 mm, the outer diameter φB of the outer peripheral portion 33 is about 79 mm, the inner diameter of the inner peripheral inclined portion 38 is about φ42 mm, and the outer peripheral inclined portion 39 The outer diameter is about φ75.6 mm, the inner diameter of the corrugation part 36 is about φ42.8 mm, and the outer diameter of the corrugation part 36 is about φ74.8 mm. In the cross-sectional shape in the radial direction of the corrugation part 36, the roll height of each roll is the highest at 1.32 mm at the central part of the corrugation part 36, and as the inner flat part 35 or the outer flat part 37 reaches 1, .1mm, 0.88mm, 0.66mm, 0.44mm, 0.22mm, and so on.

  In the damper 31 of the present embodiment, the separation distance p1 between the adjacent peak portions 36a and the valley portions 36b of the corrugation portion 36 is about 1.4 mm, and similarly to the damper 1 of the first embodiment, any adjacent peaks The portion 36a and the valley portion 36b are also equal and constant. The mountain ridge line 36ra and the valley ridge line 36rb, which are auxiliary lines when designing the shape of the damper 31, are straight lines in the damper 31 of the present embodiment, and are symmetric in the front-rear direction with respect to the horizontal line including the reference plane 34a. . Further, the inner peripheral inclined portion 38 and the outer peripheral inclined portion 39 of the corrugation portion 36 are respectively defined on a straight line obtained by extending the mountain ridge line 36ra and have a symmetric relationship with respect to the radial normal 36c.

  As shown in the displacement characteristic diagram of FIG. 4B, the damper 31 of the embodiment maintains good linearity until the amplitude displacement is about 5 mm, and when the amplitude displacement greatly exceeds 5 mm, The amount of displacement is secured while gently limiting the amplitude. Further, even when the load that the amplitude displacement exceeds 5 mm up to 15 mm is very large, the front-rear symmetry can be kept good, so that the speaker using the damper 31 (not shown) has a large audio signal. Even in the case where the speaker diaphragm is greatly displaced due to the addition of current, even-order distortion represented by second-order distortion among harmonic distortion can be suppressed to a small level.

  FIG. 5 is a diagram illustrating a damper 41 according to another embodiment. 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. Furthermore, FIG. 6 is a figure explaining the damper 51 of another Example. 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 dampers 41 and 51 have corrugations in which six peaks that are convex rolls appear on the front side (upper side in the illustrated cross-sectional shape), and five valleys that are concave rolls appear on the front side. Although the point is common to the damper 31 of the previous embodiment, the distance between the adjacent peaks and valleys of the corrugation part is not constant, and is the largest near the center part of the corrugation part. It becomes small gradually as it reaches.

  Specifically, in the damper 41, when viewed from the highest roll (valley part 46 b) corresponding to the perpendicular line 46 c that is a perpendicular bisector connecting the two end points of the corrugation part 46, the adjacent peak part 46 a Is about 1.9 mm, while the distance between the next adjacent valley 46 b is about 1.7 mm. The inter-roll pitch of the corrugation 46 is about 1.5 mm, about 1.3 mm, and about 1.1 mm, which is the largest in the vicinity of the center of the corrugation 46, and the inner peripheral inclined portion 48 or the outer peripheral inclined portion 49. It becomes small gradually as it reaches. As a result, since the slope connecting the rolls of the peak portion 46a and the valley portion 46b can be laid near the center of the corrugation portion 46, the damper 41 of the present embodiment makes the movement of the corrugation portion 46 smooth. As shown in FIG. 6B, the linearity of the amplitude displacement can be further improved as compared with the case of the damper 31 of the previous embodiment.

  Note that the mountain ridge line 46ra and the valley ridge line 46rb, which are auxiliary lines when designing the shape of the damper 41, are bent lines because the pitch between the rolls is not constant, but include the reference plane 44a. It is still symmetrical in the front-rear direction with respect to the horizon. In addition, the inner peripheral inclined portion 48 and the outer peripheral inclined portion 49 of the corrugation portion 46 may be respectively defined on a straight line extending from the mountain ridge line 46ra and have a symmetrical relationship with respect to the radial normal line 46c. This is the same as the previous embodiment.

  The damper 51 has a specification in which the design of the pitch between rolls of the previous damper 41 is different, and the highest roll (valley) corresponding to the perpendicular line 56 c that is a perpendicular bisector connecting the two end points of the corrugation unit 56. When viewed from the portion 56b), the separation distance (inter-roll pitch) from the adjacent mountain portion 56a is about 2.4 mm, whereas the separation distance from the next adjacent valley portion 46b is about 2.0 mm. Next, about 1.6 mm, about 1.2 mm, and about 0.8 mm, which are the largest in the vicinity of the central part of the corrugation 56 parts, and gradually decrease toward the inner peripheral inclined part 58 or the outer peripheral inclined part 59. It has become. Compared to the case of the damper 31 of the previous embodiment and the case of the damper 41 of the previous embodiment, the separation distance (pitch between rolls) between the peak portion 56a and the valley portion 56b adjacent in the vicinity of the central portion of the corrugation portion 56. By taking a larger value, it is possible to adjust not only the linearity of the amplitude displacement but also the amplitude limit for a large input signal.

  Further, the mountain ridge line 56ra and the valley ridge line 56rb, which are auxiliary lines when designing the shape of the damper 51, are also bent lines because the pitch between the rolls is not constant. However, there is no change in being symmetrical in the front-rear direction with respect to the horizontal line including the reference plane 54a. Further, the inner peripheral inclined portion 58 and the outer peripheral inclined portion 59 of the corrugation portion 56 are respectively defined on straight lines obtained by extending the line segments at both ends of the mountain ridge line 56ra, and have a symmetrical relationship with respect to the perpendicular perpendicular 56c. This is also the same as the previous embodiment. Like the damper 51, the pitch between the rolls is increased near the central portion of the corrugation portion 56, and the height from the reference plane 54a of the innermost peripheral peak and the outermost peripheral peak tends to increase. However, if the inner peripheral inclination angle 58 δ defined by the inner peripheral inclined portion 58 and the outer peripheral inclination angle 59 δ defined by the outer peripheral inclined portion 59 are respectively small angles of about 36.2 degrees or less, good front and rear Symmetry can be secured.

  FIG. 7 is a diagram for explaining dampers 61, 71, and 81 of another embodiment. 7A is a radial sectional view of the damper 61, FIG. 7B is a radial sectional view of the damper 71, and FIG. 7C is a radial sectional view of the damper 81. FIG. In the dampers 61, 71, and 81, four peak portions that are convex rolls appear on the front side (upper side in the illustrated cross-sectional shape), while three valley portions that are concave rolls appear on the front side. Except for the provision of corrugation, the configuration is the same as that of the other embodiments described above, and a duplicate description is omitted.

  The damper 61 has a constant separation distance between adjacent crests and troughs of the corrugation part, and is about 2.0 mm. On the other hand, in the dampers 71 and 81, the distance between the adjacent peaks and valleys of the corrugation part is not constant, and is the largest in the vicinity of the central part of the corrugation part, and sequentially toward the inner peripheral inclined part or the outer peripheral inclined part. It is getting smaller. Like the dampers of any of the embodiments described above, the damper of the present invention can achieve both linearity of amplitude displacement and symmetry of front-rear amplitude even if the number of rolls constituting the corrugation changes. it can. As described above, the number of rolls in the corrugation portion of the damper is not limited to the case of the above-described embodiment, and may be further increased depending on the size of the damper as the size of the speaker diameter is changed. .

  FIG. 8 is a radial cross-sectional view illustrating a damper 91 according to another embodiment. The damper 91 is obtained by changing the shape of the outer peripheral portion 3 of the damper 1 of the first embodiment, so that a flat damper is a rising damper, and the outer peripheral portion 93 is from the outer peripheral side end portion 97 of the outer peripheral inclined portion 99. The extending connecting portion 93c is provided to form a rising portion of the rising damper. The connecting portion 93c connects the outer peripheral side end portion 97 of the outer peripheral inclined portion 99 and a joint portion 93b with a frame (not shown) with a straight line in a cross-sectional shape. Further, the joint portion 93 b is included in another reference plane 93 a that is not included in the reference plane 94 a of the support movable portion 94.

  Like the damper 91 of the present embodiment, the outer periphery of the damper of the present invention may have a rising part of the rising damper or a falling part of the falling damper. Since the inner peripheral inclined portion 98 and the outer peripheral inclined portion 99 at both ends of the corrugation portion 96 in the radial cross-sectional shape are planar and defined on the same reference plane 94a, the damper 1 of the first embodiment which is a flat damper is used. It is possible to ensure the linearity of the amplitude displacement equivalent to the above and the longitudinal symmetry. Further, since the outer peripheral portion 93 forms a rising portion or a falling portion, even when designing a speaker having a large amplitude displacement, the distance between the magnetic circuit or the frame and the damper can be designed to be large. Alternatively, problems such as abnormal noise caused by contact between the frame and the damper are improved.

  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 conventional damper. (Conventional example 1) It is a figure explaining the damper 31 by other preferable embodiment of this invention. (Example 2) It is a figure explaining the damper 41 by other preferable embodiment of this invention. (Example 3) It is a figure explaining the damper 51 by other preferable embodiment of this invention. (Example 3) It is a figure explaining the dampers 61, 71, and 81 by other preferable embodiment of this invention. Example 4 It is a figure explaining the damper 91 by other preferable embodiment of this invention. (Example 5)

Explanation of symbols

1, 11, 21, 31, 41, 51, 61, 71, 81, 91 Damper 2 Inner peripheral part 3 Outer peripheral part 4 Support movable part 5 Inner peripheral flat part 6 Corrugation part 7 Outer peripheral flat part 8 Inner peripheral inclined part 9 Outer peripheral part Inclined part 10 Speaker 11 Magnetic circuit 12 Frame 13 Voice coil 14 Bobbin 15 Diaphragm 16 Edge

Claims (7)

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;
The support movable part is a corrugation part having a plurality of peaks and valleys, and an inner circumference formed between the inner circumference and the peaks or valleys on the innermost circumference side of the corrugation part. An inclined part, and an outer peripheral inclined part formed between the outer peripheral part and the peak part or the valley part on the outermost peripheral side of the corrugation part,
A radial cross-sectional shape of the support movable portion is symmetric with respect to a perpendicular defining the central portion of the corrugation portion;
An inner peripheral side end portion of the inner peripheral inclined portion and an outer peripheral side end portion of the outer peripheral inclined portion are planar and defined on the same reference plane, and the inner peripheral inclined portion and the outer peripheral inclined portion are Have a cross-sectional shape in which their height from the reference plane sequentially increases as it reaches the corrugation part
The height of the corrugation part from the reference plane of the peak part and the valley part is the highest in the central part of the corrugation part, and gradually decreases toward the inner peripheral inclined part or the outer peripheral inclined part.
Damper. A peak ridge line defined by a line connecting the adjacent peak parts of the corrugation part of the support movable part, and a valley ridge line defined by a line connecting the adjacent valley parts with respect to the reference plane The corrugation part is formed to be symmetric,
The damper according to claim 1. The inner peripheral inclined part and the outer peripheral inclined part of the corrugation part of the support movable part are defined on a straight line extending the mountain part ridge line or the valley part ridge line,
The damper according to claim 2 . The distance between the crest and the trough adjacent to the corrugation part of the support movable part is the largest near the central part of the corrugation part, and gradually decreases toward the inner peripheral inclined part or the outer peripheral inclined part. ,
The damper according to any one of claims 1 to 3. The inner peripheral portion and the outer peripheral portion are included on the reference plane.
The damper according to any one of claims 1 to 4. The outer peripheral portion includes a connecting portion that extends from an outer peripheral end portion of the outer peripheral inclined portion and connects to a joint portion with a frame that is not included in the reference plane.
The damper according to any one of claims 1 to 4.   A speaker comprising the damper according to claim 1.

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