WO2020000982A1

WO2020000982A1 - Diaphragm and loudspeaker

Info

Publication number: WO2020000982A1
Application number: PCT/CN2018/125336
Authority: WO
Inventors: 郭翔; 王海荣
Original assignee: 歌尔股份有限公司
Priority date: 2018-06-27
Filing date: 2018-12-29
Publication date: 2020-01-02
Also published as: CN108900955A; CN108900955B

Abstract

Disclosed by the present invention are a diaphragm and a loudspeaker, the diaphragm comprising an intermediate part and a folding ring part surrounding the periphery of the intermediate part and protruding therefrom, wherein the folding ring part comprises first straight side parts, second straight side parts, and arc-shaped corner parts connecting the first straight side parts and the second straight side parts; the arc-shaped corner parts and end parts of the first straight side parts and the second straight side parts which are connected to the arc-shaped corner parts form corner areas; a pattern is arranged on the corner areas, and the pattern extends in an up-down wavy shape along a surrounding direction of the folding ring part at the position of the pattern, and the pattern has a plurality of crest lines and trough lines; the cross section of the pattern along the surrounding direction of the folding ring part at the position of the pattern is configured as a continuously bent smooth curve, and the smooth curve has a plurality of crests and troughs. With the technical solution of the present invention, a stress concentration phenomenon of the folding ring part of the diaphragm may be reduced and the performance reliability and acoustic performance of the loudspeaker may be improved.

Description

Diaphragm and speaker

Technical field

The invention relates to the technical field of electroacoustics, and in particular to a diaphragm and a speaker.

Background technique

At present, with the development of the use of speakers, especially mobile phones, smart-pa, etc., speakers are required to be able to be used under conditions of large amplitudes while ensuring the reliability of performance. In the design of speakers, the design of the diaphragm is very critical. The quality of the design has a huge impact on the total harmonic distortion, listening, and reliability of the product. However, in the design of the diaphragm, if stress concentration occurs, it is easy to break the film. For example, in a common design scheme in which a double-row pattern is provided on a diaphragm folding ring portion at present, referring to FIG. 5, stress concentration is easy to occur at the junction of the double-row pattern, especially at the most corner position. In the design scheme with a single row of patterns on the ring, referring to FIG. 6, the bottom of the depression of the pattern, especially the bottom of the pattern at the most corner position, is also prone to stress concentration, which causes the phenomenon of stress concentration. The cross-sectional view of the pattern in FIG. 8 along the circumferential direction of the folded ring portion is similar to the two patterns. In the absence of a pattern, the cross-section of the corner region of the folded ring portion will be a straight line or a similar straight line. When a pattern is set, a plurality of depressions are formed on the straight line of the cross section. The final cross section is a half-wave structure composed of a straight line and a depression curve. The difference between the straight line and the depression curve is large, resulting in stress concentration. phenomenon. In the case of these two pattern designs, the maximum stress can reach 15-20Mpa. In these areas, due to the stress concentration, the reliability of the diaphragm is affected, and it is easy to break or delaminate. Affects the acoustic performance of the speaker.

Summary of the invention

The main purpose of the present invention is to provide a diaphragm, which aims to reduce the stress concentration phenomenon of the diaphragm folded ring portion, and improve the performance reliability and acoustic performance of the speaker.

In order to achieve the above object, the diaphragm provided by the present invention includes an intermediate portion and a protruding folded ring portion surrounding the outer periphery of the intermediate portion. The folded ring portion includes a first straight edge portion, a second straight edge portion, and a connection. An arc-shaped corner portion of the first straight edge portion and a second straight edge portion, and the arc-shaped corner portion and the ends of the first straight edge portion and the second straight edge portion connected thereto form a corner area; the corner area A pattern is provided on the pattern, and the pattern extends in an undulating wave shape along the surrounding direction of the folded ring portion at the position where the pattern is located. The pattern has a plurality of crest lines and trough lines, and the The cross section of the folded ring portion in the circumferential direction is provided as a continuously curved smooth curve, and the smooth curve has a plurality of wave peaks and valleys.

Optionally, the smooth curve is a spline curve passing through the crests and troughs.

Optionally, the cross-section in the circumferential direction of the folded ring portion is formed by a first straight line segment passing through the first straight edge portion and parallel to the extending direction of the first straight edge portion, and the second straight edge portion. A second straight line segment on the side portion and parallel to the extending direction of the second straight edge portion, and a rounded corner portion on the curved corner portion connecting the first straight line segment and the second straight line segment One surface of is cut out, and the radius value of the fillet section is equal to, greater than, or less than the radius value of the inner edge of the curved corner portion.

Optionally, the distance between the first straight line segment and the inner side of the first straight edge portion is equal to the distance between the second straight line segment and the inner side of the second straight edge portion.

Optionally, all the peaks of the smooth curve are on a straight line, and all the troughs are on a straight line.

Optionally, a straight line where all the wave peaks on the smooth curve are parallel to a straight line where all the wave troughs are located.

Optionally, the distance between any two adjacent peaks of the smooth curve is equal;

And / or, the distance between any two adjacent troughs of the smooth curve is equal;

And / or, the distance between any adjacent peaks and troughs of the smooth curve is equal.

Optionally, a curve between an adjacent wave peak and a wave valley on the smooth curve is a center-symmetrical figure.

Optionally, the pattern is formed by projecting a reference spline curve located in the corner region along the inside-outside direction of the folded ring portion.

Optionally, the reference spline curve is extended along the surrounding direction of the folded ring portion where it is located.

Optionally, the reference spline curve has a plurality of peaks and troughs, all peaks of the reference spline curve are on a straight line, all troughs are on a straight line, and the straight line where all the crests are located and the straight line where all the troughs are located Phase parallel.

Optionally, the distance between any two adjacent peaks of the reference spline curve is equal;

And / or, the distance between any two adjacent troughs of the reference spline curve is equal;

And / or, the distance between any adjacent peaks and troughs of the reference spline curve is equal.

Optionally, the curve between adjacent peaks and troughs on the reference spline curve is a center-symmetrical figure.

Optionally, the diaphragm is rectangular, and the folded ring portion includes two opposite first straight edge portions and two opposite second straight edge portions, and the first straight edge portion And the second straight edge portion is connected by the arc-shaped corner portion.

Optionally, in the surrounding direction of the folded ring portion, the peak of the smooth curve is not higher than the convex surface where the first straight edge portion and the second straight edge portion are located.

Optionally, a plurality of crest lines of the pattern are gathered toward the inside of the folded ring portion; or a plurality of crest lines of the pattern are gathered toward the outside of the folded ring portion.

Optionally, the two patterns located at the two ends of the same diagonal of the diaphragm are symmetrically arranged with respect to the center of the diaphragm.

The present invention also provides a loudspeaker including a diaphragm including a middle portion and a folded ring portion surrounding an outer periphery of the middle portion. The folded ring portion includes a first straight edge portion, a second straight edge portion, and An arc-shaped corner portion connecting the first straight edge portion and the second straight edge portion, and the arc-shaped corner portion and the ends of the first straight edge portion and the second straight edge portion connected thereto form a corner region; the corner A pattern is provided on the area, and the pattern extends up and down in a wavy shape along the surrounding direction of the folded ring portion where it is located. The pattern has a plurality of crest lines and trough lines, and the pattern follows its position. The cross section of the folded ring portion in the circumferential direction is provided as a continuously curved smooth curve, and the smooth curve has a plurality of wave peaks and valleys.

In the technical solution of the present invention, because a pattern is provided on a corner region of the folded ring portion of the diaphragm, and the pattern extends in an undulating wave shape along the surrounding direction of the folded ring portion at its position, the pattern has a plurality of crest lines. And trough lines, and the cross-section of the pattern along the surrounding direction of the folded ring portion of the pattern is continuously curved with a smooth curve set with multiple crests and troughs; and the smooth curve is tangent everywhere, and the tangent line follows the tangent point Moving and continuously rotating curve, the difference between the adjacent sections of the entire cross-section curve is small, so the stress in the corner area of the folded ring can be dispersed in the entire pattern area, and there will be no large stress concentration. Reduce to 5-8Mpa or even lower. In this way, this design not only has the advantages of increasing the strength of the diaphragm, preventing vibration deformation of the diaphragm, and making the diaphragm vibration more stable, but also can reduce the existing common pattern designs by wavy pattern design with a smooth curved section. The stress concentration phenomenon can evenly distribute the stress on the diaphragm, thereby reducing the diaphragm breakage and / or layering caused by the stress concentration, and effectively improving the reliability and acoustic performance of the product; at the same time, the design also It can reduce the vibration friction between the patterns when the diaphragm vibrates, which can further improve the reliability and acoustic performance of the product.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structure shown in the drawings without paying creative labor.

FIG. 1 is an exploded view of an embodiment of a speaker of the present invention;

2 is a schematic structural diagram of a diaphragm in FIG. 1;

3 is a schematic cross-sectional view of the pattern on the diaphragm in FIG. 2 along the surrounding direction of the folded ring portion;

4 is a cross-sectional expanded view of the pattern in FIG. 3;

5 is a schematic structural diagram of a diaphragm provided with a double-row pattern in the background art;

6 is a schematic structural diagram of a diaphragm with a single row pattern in the background art;

7 is a schematic cross-sectional view of the pattern on the diaphragm in FIG. 6 along the circumferential direction of the folded ring portion;

FIG. 8 is a cross-sectional development view of the single-row pattern in FIG. 7.

BRIEF DESCRIPTION OF THE DRAWINGS

标号Label	名称 name	标号Label		名称name
11	外壳 shell	22	导磁轭 Magnetic yoke
521e521e	光滑曲线 Smooth curve	3131	中心磁体Central magnet
3232	边磁体 Side magnet	44	中心导磁板Center magnetic plate
55	振膜 Diaphragm	5050	振膜主体 Diaphragm body
5353	补强部 Reinforcement Department	5151	中间部 Middle
5252	折环部 Folding ring	521521	拐角区域 Corner area
521a，521b521a, 521b		花纹Pattern	522522	第一直边部First straight edge
523523	第二直边部Second straight edge	524524	弧形拐角部 Curved corner
66	音圈 Voice coil	77	定心支片Centering Branch
521c521c
凹陷部Depression	521d521d	直线段straight line

The realization of the purpose, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the drawings.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back, etc.) in the embodiment of the present invention, the directional indication is only used to explain in a specific posture (as shown in the accompanying drawings) (Shown) the relative positional relationship and movement of each component, etc., if the specific posture changes, the directivity indication will change accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiment of the present invention, the descriptions of "first", "second", etc. are only used for description purposes, and cannot be understood as instructions or hints Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those that can be realized by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, such a combination of technical solutions should be considered non-existent. , Is not within the scope of protection claimed by the present invention.

The invention provides a diaphragm and a speaker having the diaphragm.

Referring to FIGS. 1 to 4, in an embodiment of the present invention, the diaphragm 5 includes an intermediate portion 51 and a folded ring portion 52 surrounding the outer periphery of the intermediate portion 51. The folded ring portion 52 includes a first straight edge portion 522 and a second The straight edge portion 523 and the arc-shaped corner portion 524 connecting the first straight edge portion 522 and the second straight edge portion 523, the arc-shaped corner portion 524 and the first straight edge portion 522 and the second straight edge portion 523 connected thereto. The corner portion 521 constitutes a corner region 521; a pattern 521a is provided on the corner region 521, and the pattern 521a extends up and down in a wavy shape along the surrounding direction of the folded portion 52 at the position where the pattern 521a has a plurality of crest lines and valley lines The cross section of the pattern 521a along the circumferential direction of the folded ring portion 52 at the position thereof is provided with a smooth curve 521e that is continuously bent. The smooth curve 521e has a plurality of peaks and troughs.

It should be noted that, in this embodiment, the diaphragm 5 can be specifically applied to a smart phone-pa of a mobile phone. Of course, the technical solution of the present invention can also be applied to products such as headphones or speakers of a tablet computer. Referring to FIG. 1, a speaker generally includes a magnetic circuit system, a vibration system, and a support system. The support system includes a casing 1 for receiving a fixed magnetic circuit system and a vibration system. The magnetic circuit system usually includes a magnetic yoke 2, a magnet, a magnetic plate, and the like. The magnetic yoke 2 is used to fix the magnet and correct the magnetic field lines. Specifically, in the multi-magnetic circuit system shown in this embodiment, the magnet includes a central magnet 31, The magnetic plate includes a central magnetically permeable plate 4 provided on a central magnet 31; in a magnetic circuit system, a magnetic yoke 2 is provided with an inner magnetic circuit portion and an outer magnetic circuit portion, between the inner magnetic circuit portion and the outer magnetic circuit portion A magnetic gap is formed. The vibration system includes a diaphragm 5 and a voice coil 6, the diaphragm 5 is connected to the side of the voice coil 6 away from the magnetic circuit system, and the other side of the voice coil 6 is suspended in a magnetic gap; the diaphragm 5 generally includes a diaphragm main body 50 And a reinforcing portion 53 for adjusting the acoustic performance, and the diaphragm body 50 generally includes a middle portion 51 and a folded ring portion 52 surrounding the outer periphery of the middle portion 51. In addition, in this embodiment, the speaker further includes a centering support 7 connected to the diaphragm 5 and the voice coil 6 to reduce polarization.

In the current common design of the diaphragm 5, in order to strengthen the strength of the diaphragm 5, prevent deformation of the diaphragm 5 during vibration, and make the diaphragm 5 vibrate more smoothly, a pattern 521 b may be generally provided on the folded ring portion 52, for example, 5 to 8, a double-row or single-row pattern 521 b may be provided on the folding ring portion 52. However, in the design scheme of the double-row pattern 521b, the stress concentration phenomenon is easy to occur at the junction of the double-row pattern 521b, especially at the corner. In the design of the single-row pattern 521b, referring to FIG. 6, in the pattern 521b, The bottom of the recess, especially the bottom of the pattern 521b at the most corner position, is also prone to stress concentration. For the cause of the stress concentration phenomenon, refer to the cross-sectional views of the pattern 521b in the circumferential direction of the folded ring portion 52 in Figs. 7 and 8. The cross-sectional views of the two patterns 521b are similar. Without the pattern 521b, the The cross section of the corner region 521 of the ring portion 52 will be a straight line or a similar straight line. When the pattern 521b is provided, a plurality of recessed portions 521c are formed on the cross section straight line. The final cross section is composed of a straight segment 521d and a recessed curve. Similar to the half-wave structure, the difference between the straight line segment 521d and the depression curve is large, which results in stress concentration. In the case of the design of these two patterns 521b, the maximum stress can reach 15-20Mpa. In these regions, stress concentration will cause the reliability of the diaphragm 5 to be affected, and it is easy to break or delaminate. , Which affects the acoustic performance of the speaker; in particular, when the diaphragm 5 is vibrating, the existing pattern design still has a large vibration friction, which may even cause the two patterns to fold in the middle of the middle, which greatly affects the reliability of the product. Performance and acoustic performance.

In this embodiment, a pattern 521a is provided on the corner region 521 of the folded-back ring portion 52 of the diaphragm 5, and the pattern 521a extends in a wave-like manner up and down along the surrounding direction of the folded-back ring portion 52 at its position. 521a has a plurality of crest lines and trough lines, and the cross section of the pattern 521a along the circumferential direction of the folded ring portion 52 where it is located is continuously curved with a smooth curve 521e having a plurality of crests and troughs; and the smooth curve 521e is There are tangent lines everywhere, and the tangent line continuously rotates with the movement of the tangent point. The difference between adjacent parts of the entire cross-sectional curve is small, so the stress in the corner region 521 of the folded ring portion 52 can be divided in the entire pattern area. There will be a large stress concentration phenomenon, and the maximum stress can be reduced to 5-8Mpa or even lower. In this way, this design not only has the advantages of enhancing the strength of the diaphragm 5, preventing the vibration deformation of the diaphragm 5, and making the diaphragm 5 more stable, but also can reduce the current common patterns through the wavy pattern design with a smooth curve 521e. The stress concentration phenomenon in the design of 521a can evenly distribute the stress on the diaphragm 5, thereby reducing the situation of the diaphragm 5 breaking and / or layering caused by the stress concentration, and effectively improving the reliability and acoustics of the product. At the same time, this design can also reduce the vibration friction between the patterns 521a when the diaphragm 5 vibrates, which can further improve the reliability and acoustic performance of the product.

Referring to FIGS. 1 to 4, in this embodiment, the smooth curve 521 e is a spline curve passing through peaks and troughs. The cross-section in the circumferential direction of the folded ring portion 52 is composed of a first straight section (not labeled) and a second straight edge section 523 passing through the first straight edge section 522 and parallel to the extending direction of the first straight edge section 522. A second straight line segment (not labeled) on the top and parallel to the extending direction of the second straight edge portion 523, and a rounded corner segment (not labeled) on the curved corner portion 524 connecting the first straight line segment and the second straight line segment One of the faces is cut out, and the radius value of the fillet segment is equal to, larger or smaller than the radius value of the inner edge of the arc-shaped corner portion 524. Here, the distance of the first straight line segment from the inner side of the first straight side portion is preferably equal to the distance of the second straight line segment from the inner side of the second straight side portion. In this way, the smooth curve after the cross-section is shown in FIG. 3, and the cross-sectional development view of the smooth curve 521e in FIG. 3 is shown in FIG. 4, and the pattern provided with the smooth curve can effectively reduce the stress concentration phenomenon. To improve product reliability and acoustic performance.

Further, all the peaks of the smooth curve 521e are on a straight line, and all the troughs are on a straight line. Moreover, the straight line where all the wave peaks on the smooth curve 521e and the straight line where all the wave troughs are located is preferably set in parallel. This setting can further reduce the difference between the adjacent parts of the smooth curve 521e in the up-down direction, thereby helping to reduce the stress concentration phenomenon.

Further, the distance between any two adjacent peaks of the smooth curve 521e is equal; and / or, the distance between any two adjacent valleys of the smooth curve 521e is equal; and / or, any adjacent of the smooth curve 521e The distance between the peaks and troughs is equal. Specifically, in this embodiment, it is preferable that the distance between any two adjacent peaks of the smooth curve 521e is equal, and the distance between any two adjacent valleys is also equal. At the same time, the distance between any adjacent peaks and valleys is equal. The distances are also equal. This setting can further reduce the difference between the adjacent portions of the smooth curve 521e in the surrounding direction of the folded-back ring portion 52 along its position, thereby facilitating reducing the stress concentration phenomenon.

Further, the curve between the adjacent peaks and troughs on the smooth curve 521e is a center-symmetrical pattern. It can be understood that the symmetrical configuration of the shape can further reduce the shape difference of the curve.

Further, in this embodiment, the pattern 521a is formed by projecting a reference spline curve (not labeled) located in the corner region along the inside-outside direction of the folded ring portion. Specifically, the reference spline curve is extended along the surrounding direction of the folded ring portion where it is located. Moreover, the reference spline curve has multiple peaks and troughs, all peaks of the reference spline curve are on a straight line, all troughs are on a straight line, and the straight line where all the crests are located is parallel to the straight line where all the troughs are located. The distance between any two adjacent peaks of the reference spline is equal; and / or, the distance between any two adjacent valleys of the reference spline is equal; and / or, any adjacent of the reference spline The distance between the peaks and troughs is equal. Specifically in this embodiment, it may be preferred that the distance between any two adjacent peaks of the reference spline curve is equal; at the same time, the distance between any two adjacent valleys is equal; and The distance between them is equal. Further, the curve between the adjacent peaks and troughs on the reference spline curve is a center-symmetrical figure. It can be understood that through these shape-defining settings, the shape difference of the smooth curve 521e can be further reduced, and a better stress dispersion effect can be achieved, which is conducive to reducing the phenomenon of stress concentration and improving the reliability and acoustic performance of the product.

1 and FIG. 2, specifically, in this embodiment, the diaphragm 5 is provided in a rectangular shape. The folded ring portion 52 of the diaphragm 5 includes two opposite first straight edge portions 522 and two opposite first straight edge portions 522. Two straight edge portions 523. Specifically, in this embodiment, two relatively long edge portions are the first straight edge portion 522, and the other two relatively short edge portions are the second straight edge portion 523. The first The straight edge portion 522 and the second straight edge portion 523 are connected by an arc-shaped corner portion 524. In other words, the folded ring portion 52 is rectangular, and the four corners thereof are arc-shaped corner portions 524. It can be understood that when the diaphragm 5 is rectangular, its four arc-shaped corner portions 524 are vibration-susceptible parts, and the provision of the pattern 521a at this part can effectively strengthen the strength there to prevent deformation and make the vibration more stable. Of course, in other embodiments, in addition to providing the pattern 521a at the curved corner portion 524, the pattern 521a may also be provided in other areas according to the actual vibration of the diaphragm 5, for example, when the first side portion 522 is longer At this time, a pattern 521a for increasing strength may be provided on the first side portion 522.

Further, in the surrounding direction of the folded ring portion 52, the peak of the pattern 521a is not higher than the convex surface where the first straight edge portion 522 and the second straight edge portion 523 are located. In particular, in this embodiment, the The crests are flush with the convex surfaces where the first straight edge portion 522 and the second straight edge portion 523 are located. Of course, in other embodiments, the peaks of the pattern 521a may also protrude from the convex surfaces of the first straight edge portion 522 and the second straight edge portion 523. However, the flat top arrangement in this embodiment is not only conducive to further stress dispersion In addition, the diaphragm 5 can be more beautiful, and the volume thickness of the diaphragm 5 can be reduced, so that the speaker product can be thinner.

Further, a plurality of crest lines of the pattern 521a may be gathered toward the inner side of the folded ring portion 52; or a plurality of crest lines of the pattern 521a may be gathered toward the outside of the folded ring portion 52. Preferably, referring to FIGS. 2 and 3, in this embodiment, the center lines of the plurality of wave peaks of the pattern 521 a intersect at a point on the inner side of the folded ring portion 52. This shape setting can more adapt to the change of the arc angle of the arc-shaped corner portion 524, which is beneficial to uniform stress dispersion.

As shown in FIG. 2, when the diaphragm 5 is rectangular, the two patterns 521 a located at both ends of the same diagonal of the diaphragm 5 are symmetrically disposed with respect to the center of the diaphragm 5. Further, the patterns 521 a of the four corner regions 521 may be further preferably arranged symmetrically with respect to the center of the diaphragm 5. It can be understood that the symmetrical arrangement of the patterns 521a can make the structure of the diaphragm 5 more balanced, which is conducive to improving the vibration stability.

The above is only a preferred embodiment of the present invention, and therefore does not limit the scope of the patent of the present invention. Any equivalent structural transformation or direct / indirect use of the description and drawings of the present invention under the inventive concept of the present invention All other related technical fields are included in the patent protection scope of the present invention.

Claims

A diaphragm includes a middle portion and a protruding folded ring portion that surrounds the outer periphery of the middle portion, wherein the folded ring portion includes a first straight edge portion, a second straight edge portion, and a first connecting edge portion. An arc-shaped corner portion of the straight edge portion and a second straight edge portion, the arc-shaped corner portion and ends of the first straight edge portion and the second straight edge portion connected to the arc-shaped corner portion;

A pattern is provided on the corner region, and the pattern extends up and down in a wave shape along the surrounding direction of the folding ring portion where it is located. The pattern has a plurality of crest lines and trough lines, and the edges of the pattern The cross section of the folded ring portion in the surrounding direction of the folded ring portion is provided with a continuously curved smooth curve, and the smooth curve has a plurality of wave peaks and valleys.
The diaphragm according to claim 1, wherein the smooth curve is a spline curve passing through the wave peaks and valleys.
The diaphragm according to claim 1, wherein the cross section in the circumferential direction of the folded ring portion passes through the first straight edge portion and is parallel to the direction in which the first straight edge portion extends. A first straight line segment, a second straight line segment on the second straight edge portion and parallel to the extending direction of the second straight edge portion, and a curved corner portion connecting the first straight line segment and One surface of the rounded corner section of the second straight line section is cut out, and a radius value of the rounded corner section is equal to, larger or smaller than a radius value of an inner side of the curved corner portion.
The diaphragm according to claim 3, wherein a distance from the first straight line segment to an inner side of the first straight edge portion is equal to an inner distance of the second straight line segment from the second straight edge portion. The distance of the edges.
The diaphragm according to any one of claims 1 to 4, wherein all the peaks of the smooth curve are on a straight line, and all the troughs are on a straight line.
The diaphragm according to claim 5, wherein the straight line where all the wave peaks on the smooth curve are located is parallel to the straight line where all the wave valleys are located.
The diaphragm according to any one of claims 1 to 4, wherein a distance between any two adjacent peaks of the smooth curve is equal;

And / or, the distance between any two adjacent troughs of the smooth curve is equal;

And / or, the distance between any adjacent peaks and troughs of the smooth curve is equal.
The diaphragm according to any one of claims 1 to 4, wherein a curve between an adjacent wave peak and a wave valley on the smooth curve is a center-symmetrical pattern.
The diaphragm according to any one of claims 1 to 4, wherein the pattern is formed by projecting a reference spline curve located in the corner region along the inside-outside direction of the folded ring portion.
The diaphragm according to claim 9, wherein the reference spline curve is extended along the surrounding direction of the folded ring portion at the position where the reference spline curve is located.
The diaphragm according to claim 9, wherein the reference spline curve has a plurality of peaks and troughs, all peaks of the reference spline curve are on a straight line, all troughs are on a straight line, and all The straight line of the crests is parallel to the straight line of all the troughs.
The diaphragm according to claim 9, wherein the distance between any two adjacent peaks of the reference spline curve is equal;

And / or, the distance between any two adjacent troughs of the reference spline curve is equal;

And / or, the distance between any adjacent peaks and troughs of the reference spline curve is equal.
The diaphragm according to claim 9, wherein the curve between the adjacent peaks and troughs on the reference spline curve is a center-symmetrical pattern.
The diaphragm according to claim 1, wherein the diaphragm is rectangular, and the folded ring portion includes two opposite first straight edges and two opposite second straight portions. A side portion, the first straight side portion and the second straight side portion are connected by the arc-shaped corner portion.
The diaphragm according to claim 1, wherein in the surrounding direction of the folded ring portion, a peak of the smooth curve is not higher than where the first straight edge portion and the straight second edge portion are located. Convex surface.
The diaphragm according to claim 1, wherein a plurality of crest lines of the pattern are gathered toward the inside of the folded ring portion; or

A plurality of crest lines of the pattern are gathered outside the folded ring portion.
The diaphragm according to claim 14, wherein the two patterns located at both ends of the same diagonal of the diaphragm are symmetrically disposed with respect to the center of the diaphragm.
A loudspeaker, comprising the diaphragm according to any one of claims 1 to 17.