Lens driving mechanism and circuit board thereof

Abstract

The invention discloses a lens driving mechanism and a circuit board thereof, the circuit board comprises a top plate, a first bending section, a second bending section and a support member, and the top plate extends along a first direction. The first bent section comprises a first vertical section and a first horizontal section, the top end of the first vertical section is connected with the top plate in a bent mode, the bottom end of the first vertical section extends downwards in the vertical direction, and one end of the first horizontal section is connected with the bottom end of the first vertical section. The second bent section comprises a second vertical section and a second horizontal section, the top end of the second vertical section is connected with the top plate in a bent mode, the bottom end of the second vertical section extends downwards in the vertical direction, and one end of the second horizontal section is connected with the bottom end of the second vertical section. The supporting piece comprises a top supporting body and two bottom supporting bodies, the top supporting body is connected with the top plate, and the two bottom supporting bodies are connected with the two ends, in the first direction, of the top supporting body and abut against the first horizontal section and the second horizontal section respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical element driving, in particular to a lens driving mechanism and a circuit board thereof. BACKGROUND

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) nowadays have the functions of taking pictures or recording videos. These electronic devices are becoming more and more popular and are developing towards the direction of convenience and thinness, so as to provide users with more choices.

[0003] Some electronic devices with the functions of taking pictures or recording videos are provided with lens driving modules to drive optical components such as lenses to move, thereby achieving the functions of automatic focusing and optical anti-shake. The carrier is large in size and weight, and it is difficult to drive the carrier to move, which needs to be improved. SUMMARY

[0004] The present application aims to provide a lens driving mechanism and a circuit board thereof to solve the problems in the prior art.

[0005] To solve the above technical problems, the embodiment of the present application provides a circuit board, which comprises: a top plate extending along a first direction; a first bending section comprising a first vertical section and a first horizontal section, the top end of the first vertical section being connected to the top plate in a bending manner, the bottom end extending downward along a vertical direction, and one end of the first horizontal section being connected to the bottom end of the first vertical section; a second bending section comprising a second vertical section and a second horizontal section, the top end of the second vertical section being connected to the top plate in a bending manner, the bottom end extending downward along a vertical direction, and one end of the second horizontal section being connected to the bottom end of the second vertical section; a support comprising a top support body and two bottom support bodies, the top support body being connected to the top plate, and the two bottom support bodies being connected to the top support body at both ends along the first direction and abutting against the first horizontal section and the second horizontal section respectively.

[0006] In one embodiment, the first bending section and the second bending section are arranged along a second direction, and the second direction is perpendicular to the first direction. The top support body is an L-shaped plate bent along the second direction.

[0007] In one embodiment, the first horizontal section and the second horizontal section both extend along the first direction and are located in the same horizontal plane.

[0008] In one embodiment, the first vertical section and the second vertical section are located on two opposite sides of the top plate along the first direction.

[0009] In one embodiment, the two first bending sections are spaced apart along a second direction; the two second bending sections are spaced apart along the second direction; the two supports are spaced apart along the second direction, and the top support of the two supports is connected with the top plate, wherein the two bottom supports of one of the supports are respectively abutted against the first horizontal section of one of the first bending sections and the second horizontal section of one of the second bending sections; the two bottom supports of the other of the supports are respectively abutted against the first horizontal section of the other of the first bending sections and the second horizontal section of the other of the second bending sections.

[0010] The present application also relates to a lens driving mechanism, comprising: a base; the above-mentioned circuit board, the first horizontal section and the second horizontal section being connected with the base; an image sensor, the image sensor being located on the top surface of the top plate; a carrier, the carrier being connected with the bottom surface of the top plate; a driving member, the driving member being connected with the carrier and the base, and being operable to drive the carrier to move the top plate along a vertical direction.

[0011] In one embodiment, the driving member comprises a magnet group and a coil group, the magnet group being connected with one of the carrier and the base, the coil group being connected with the other of the carrier and the base, and the coil group being cooperated with the magnet group to drive the carrier to extend a vertical movement.

[0012] In one embodiment, the base comprises: a bottom plate, two first bosses, the two first bosses being spaced apart along a second direction, and each first boss being provided with a recess for mounting the magnet group; the carrier being located between the two first bosses; the coil group being connected with the carrier.

[0013] In one embodiment, the base further comprises a plurality of rolling members; the plurality of rolling members being vertically ball-connectable with the two first bosses; the carrier being vertically rollable connected with the plurality of rolling members.

[0014] In one embodiment, the base further comprises: a second protrusion connected with the bottom plate; a plurality of rolling members ball-connected with the second protrusion in the vertical direction; the carrier is ball-connected with the plurality of rolling members in the vertical direction.

[0015] In one embodiment, the second protrusion is located at one end of the two first protrusions in the first direction. the carrier is T-shaped and partially located between the second protrusion and the two first protrusions.

[0016] In one embodiment, the second protrusion is further provided with an adsorbing magnet. the carrier is provided with a metal sheet, which is oppositely arranged with the adsorbing magnet and is attracted to each other.

[0017] In one embodiment, the bottom surface of the carrier is further provided with a mounting groove; the top wall of the mounting groove is provided with a protruding winding post. the coil group is wound on the winding post and is electrically connected with the circuit board.

[0018] In one embodiment, the base is further provided with an inductive magnet. the top plate is provided with a position sensor inductive to the inductive magnet.

[0019] In one embodiment, the base further comprises a third protrusion located on the top surface of the bottom plate and provided with a receiving groove for receiving the inductive magnet.

[0020] In one embodiment, the two first bending sections are located at two sides of the two first protrusions in the second direction, and the first horizontal sections of the two first bending sections are respectively connected with the bottom plate. the two second bending sections are located at two sides of the two first protrusions in the second direction, and the second horizontal sections of the two second bending sections are connected with the bottom plate. the two supports are arranged in the second direction and the top support bodies of the two supports are connected with the top plate, wherein the two bottom support bodies of one of the supports respectively abut against the first horizontal section of one of the first bending sections and the second horizontal section of one of the second bending sections; the two bottom support bodies of the other support respectively abut against the first horizontal section of the other first bending section and the second horizontal section of the other second bending section. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of a lens driving mechanism according to an embodiment of the present application.

[0022] Figure 2 、 Figure 3 and Figure 4 are Figure 1 are exploded views of the lens driving mechanism in the embodiment shown in FIG. 1.

[0023] Figure 5 and Figure 6 are Figure 1 are exploded views of the circuit board and the image sensor in the embodiment shown in FIG. 1.

[0024] Figure 7 are Figure 1 are perspective views of the circuit board in the embodiment shown in FIG. 1.

[0025] Figure 8 are Figure 1 are exploded views of the carrier, the coil set, and the metal sheet in the embodiment shown in FIG. 1.

[0026] Figure 9 are Figure 1 are perspective views of the base in the embodiment shown in FIG. 1.

[0027] Figure 10 are Figure 1 are exploded views of the base in the embodiment shown in FIG. 1.

[0028] Figure 11 are Figure 1 are top views of the lens driving mechanism in the embodiment shown in FIG. 1.

[0029] Figure 12 are Figure 11 are sectional views of the lens driving mechanism along line A-A in the embodiment shown in FIG. 1.

[0030] Reference numerals: 100, lens driving mechanism; 1, base; 11, bottom plate; 12, first boss; 121, magnet set; 122, recess; 13, second boss; 131, adsorbing magnet; 132, first guide groove; 133, ball; 134, accommodating groove; 14, third boss; 141, inductive magnet; 142, accommodating groove; 2, carrier; 22, coil set; 23, main body segment; 231, mounting groove; 232, winding post; 24, guide segment; 241, second guide groove; 25, metal sheet; 3, circuit board; 31, first bent segment; 311, first vertical segment; 312, first vertical segment; 32, second bent segment; 321, second vertical segment; 322, second horizontal segment; 33, top plate; 34, position sensor; 4, image sensor; 5, housing; 51, light inlet; 6, support; 61, top support body; 62, bottom support body. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0032] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0034] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0035] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0036] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0037] The present invention relates to a lens driving mechanism 100 and its circuit board 3. The lens driving mechanism 100 includes a base 1, a carrier 2, a circuit board 3, an image sensor 4, a driving component, and a housing 5.

[0038] The base 1 includes a base plate 11, two first protrusions 12, a second protrusion 13, and a third protrusion 14. The base plate 11 is rectangular and, together with the outer casing 5, forms a space to accommodate the carrier 2 and the circuit board 3. The outer casing 5 is also provided with a light inlet 51 to facilitate the entry of light into the interior and its projection onto the image sensor 4.

[0039] The two first bosses 12, the second bosses 13 and the third bosses 14 are fixedly connected to the top surface of the base plate 11, and are preferably integrally formed.

[0040] Two first protrusions 12 extend along a first direction and are spaced apart along a second direction. Each of the two first protrusions 12 has a groove 122 on one side opposite to the other, and the groove 122 extends along the first direction.

[0041] The second protrusion 13 and the third protrusion 14 extend along the second direction and are located at the two ends of the two first protrusions 12 along the first direction, and are spaced apart from the two ends of the two first protrusions 12.

[0042] The second protrusion 13 has a receiving groove 134 for installing an adsorption magnet 131 and two first guide grooves 132 on the side facing the two first protrusions 12. The two first guide grooves 132 are open to the two first protrusions 12 and extend in the vertical direction. Two or one rolling element is installed in each first guide groove 132. The rolling element can be a ball 133 or a roller with its axis extending in the second direction.

[0043] The third protrusion 14 has a receiving groove 142 for installing the induction magnet 141 on the side facing the two first protrusions 12.

[0044] The driving component includes two magnet groups 121 and a coil group 22. The two magnet groups 121 are respectively installed in the grooves 122 of the two first protrusions 12, while the coil group 22 is connected to the carrier 2. The coil group 22 and the two magnet groups 121 cooperate to drive the carrier 2 to move in the vertical direction. Of course, the coil group 22 can also be set at the first protrusion 12 or other positions on the base 1, and the magnet groups 121 can be set on the carrier 2.

[0045] In one embodiment, such as Figure 4 As shown, the carrier 2 is T-shaped and includes a main body section 23 and a guide section 24. The main body section 23 is located between two first protrusions 12 and has a mounting groove 231 on its bottom surface. The top wall of the mounting groove 231 has two winding posts 232, and the coil group 22 is wound on the two winding posts 232. The top surface of the carrier 2 is electrically connected to the top plate 33 of the circuit board 3.

[0046] The guide section 24 is located in the area between the second boss 13 and the two first bosses 12. The guide section 24 and the main body section 23 are integrally formed and the side facing the second boss 13 is provided with two second guide grooves 241. The two second guide grooves 241 extend vertically and are opposite to the two first guide grooves 132 respectively, which are used to clamp the rolling parts and play a guiding role.

[0047] When the carrier 2 moves to its lowest point, its overall height is basically level with the height of the first protrusion 12 and the second protrusion 13. The guide section 24 is also basically level with the second protrusion 13. The two ends of the two first protrusions 12 are aligned along the first direction. The width of the carrier 2 along the first direction is slightly smaller than the distance between the first protrusion 12 and the second protrusion 13. The height of the main body section 23 is also basically level with the height of the first protrusion 12. The width of the main body section 23 along the second direction is basically consistent with the distance between the two first protrusions 12 along the second direction. The cooperation of the first protrusions 12 and the second protrusion 13 can also restrict the movement of the carrier 2 along the first or second direction.

[0048] In another embodiment, a first guide groove 132 for mounting a rolling element may be provided at one end of the first boss 12 along a first direction; and a second guide groove 241 may be provided on the side of the guide section 24 of the carrier 2 facing the first boss 12, with the second guide groove 241 and the first guide groove 132 cooperating to accommodate the rolling element. Alternatively, an adsorption magnet 131 may be provided on the first boss 12, and a metal sheet 25 attracted to the adsorption magnet 131 may be provided on the guide section 24, so that the guide section 24 and the first boss 12 are close to each other.

[0049] The carrier 2 is used to drive the top plate 33 of the circuit board 3 to move in the vertical direction. Specifically, the circuit board 3 is a flexible circuit board and includes a top plate 33, a first bending section 31, a second bending section 32 and a support member 6. The top plate 33 extends in the first direction and is located on the top surface of the carrier 2. The top plate 33 and the carrier 2 are fixedly connected.

[0050] Image sensor 4 is located on the top surface of top plate 33. When carrier 2 moves vertically, it can drive circuit board 3 and top plate 33 to move vertically. The lens is located above image sensor 4 and housing 5. When image sensor 4 moves vertically, the distance between image sensor 4 and lens can be adjusted, thereby achieving the zoom effect of the captured image.

[0051] The first bending segment 31 includes a first vertical segment 311 and a first horizontal segment 312. The top end of the first vertical segment 311 is connected to the top plate 33 in a bent shape. Specifically, the top end of the first vertical segment 311 is slightly L-shaped with a small bending degree and is connected to the top plate 33 on one side along the first direction. The bottom end of the first vertical segment 311 extends downward in the vertical direction.

[0052] One end of the first horizontal segment is connected to the bottom end of the first vertical segment 311, and the other end extends along the first direction and connects to the top surface of the base plate 11. Of course, the first horizontal segment can also extend along the second direction or other directions, as long as it is fixedly connected to the base plate 11.

[0053] The shape of the second bent section 32 is the same as that of the first bent section 31, including a second vertical section 321 and a second horizontal section 322. The top end of the second vertical section 321 is connected to the top plate 33 in a bent shape, and the bottom end extends downward in the vertical direction. The difference is that the top end of the second vertical section 321 is connected to the other side of the top plate 33 along the first direction. The second vertical section 321 and the first vertical section 311 are located on both sides of the top plate 33 along the first direction.

[0054] One end of the second horizontal segment 322 is connected to the bottom end of the second vertical segment 321, and the other end extends along the first direction or other directions. The second horizontal segment 322 fits against the base plate 11 and is fixedly connected to the base plate 11.

[0055] The support member 6 includes a top support 61 and two bottom supports 62. The top support 61 is flat and abuts against the bottom surface of the top plate 33 and is connected to the top plate 33. The two bottom supports 62 are connected to the top support 61 at both ends along the first direction and abut against the first horizontal section and the second horizontal section 322 respectively.

[0056] In one specific embodiment, such as Figure 5 As shown, the first bent segment 31 and the second bent segment 32 are arranged along the second direction, with the second bent segment 32 located on the inner side. The top support 61 is a bent L-shaped plate, and the two bottom supports 62 are each bent in an L-shape. The two bottom supports 62 are located at the bends of the first bent segment 31 and the second bent segment 32, respectively, and match the bends of the first bent segment 31 and the second bent segment 32.

[0057] Preferably, the first horizontal segment and the second horizontal segment 322 both extend along the first direction and are located on the same horizontal plane, respectively abutting against the top surface of the base plate 11 and fixedly connected to the top surface of the base plate 11.

[0058] exist Figure 5 In the illustrated embodiment, two first bending segments 31 are spaced apart along the second direction, and the first vertical segments 311 are respectively connected to the two sides of the top plate 33 along the second direction. The first horizontal segments of the two first bending segments 31 are respectively connected to the bottom plate 11. Two second bending segments 32 are spaced apart along the second direction, and the two second bending segments 32 are adjacent to the two first bending segments 31 and are respectively located inside the two first bending segments 31 along the second direction. The second vertical segments 321 of the two second bending segments 32 are respectively connected to the top plate 33, and the second horizontal segments 322 are respectively abutted against the bottom plate 11 and fixedly connected to the bottom plate 11.

[0059] Two support members 6 are arranged at intervals along the second direction, and the top support body 61 of both support members 6 is connected to the top plate 33. The two bottom support bodies 62 of one support member 6 respectively abut against the first horizontal section of one of the first bending sections 31 on one side of the top plate 33 along the second direction and the second horizontal section 322 of the second bending section 32 adjacent to the first horizontal section. The two bottom support bodies 62 of the other support member 6 abut against the first horizontal section of the first bending section 31 and the second horizontal section 322 of the second bending section 32 on the other side of the top plate 33.

[0060] The bottom surface of the top plate 33 is also provided with a position sensor 34. The position sensor 34 is located above the sensing magnet 141 inside the third protrusion 14, and the two work together to sense the position of the top plate 33.

[0061] The carrier 2 is located between the two second bending sections 32, and the top surface of the carrier 2 is connected to the bottom surface of the top plate 33.

[0062] A metal sheet 25 is also installed on the side of the carrier 2 facing the second protrusion 13. The metal sheet 25 is attracted to the magnet 131 located in the second protrusion 13, so that the guide section 24 of the carrier 2 is close to the second protrusion 13.

[0063] This invention utilizes the first bent segment 31 and the second bent segment 32 of the circuit board 3 as support legs to support the base 1. After the carrier 2 drives the top plate 33 to move longitudinally, the elastic characteristics of the first bent segment 31 and the second bent segment 32 can achieve a reset effect. In order to ensure the strength of the support structure of the circuit board 3, and to avoid the excessive recovery elasticity of the first bent segment 31 and the second bent segment 32 from affecting the stability of its longitudinal movement, a support member 6 is provided inside the first bent segment 31 and the second bent segment 32. The support member 6 is sleeved inside the first bent segment 31 and the second bent segment 32 and connected to the top plate 33 to ensure that the top end face of the top plate 33 can remain horizontal and straight when it moves longitudinally with the carrier 2, and will not tilt the top end face, which would cause the image sensor 4 to receive light unstably. The design of the support member 6 ensures that when the top plate 33 moves longitudinally, only the first bent segment 31 and the second bent segment 32 will deform and generate elastic force, while the top end face will not deform. This facilitates the force analysis and precise control of its deformation and rebound force. The image sensor 4 is moved by the drive circuit board 3, avoiding the movement of the drive carrier 2. This method is convenient, stable enough, and has high accuracy.

[0064] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0065] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0066] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A circuit board, characterized in that, The circuit board includes: A top plate extending along a first direction; The first bending segment includes a first vertical segment and a first horizontal segment. The top end of the first vertical segment is connected to the top plate in a bent shape, and the bottom end extends downward in the vertical direction. One end of the first horizontal segment is connected to the bottom end of the first vertical segment. The second bending section includes a second vertical section and a second horizontal section. The top end of the second vertical section is connected to the top plate in a bent shape, and the bottom end extends downward in the vertical direction. One end of the second horizontal section is connected to the bottom end of the second vertical section. The support includes a top support and two bottom supports. The top support is connected to the top plate, and the two bottom supports are connected to the top support at both ends along the first direction and respectively abut against the first horizontal segment and the second horizontal segment.

2. The circuit board according to claim 1, characterized in that, The first bent segment and the second bent segment are arranged along a second direction, which is perpendicular to the first direction; The top support is an L-shaped plate bent along the second direction.

3. The circuit board according to claim 1, characterized in that, Both the first horizontal segment and the second horizontal segment extend along the first direction and are located on the same horizontal plane.

4. The circuit board according to claim 1, characterized in that, The first vertical segment and the second vertical segment are located on opposite sides of the top plate along the first direction.

5. The circuit board according to claim 1, characterized in that, The two first bending segments are spaced apart along the second direction; The two second bending segments are spaced apart along the second direction; Two of the support members are arranged at intervals along the second direction, and the top support bodies of both support members are connected to the top plate. The two bottom support bodies of one support member abut against the first horizontal segment of one of the first bending segments and the second horizontal segment of one of the second bending segments, respectively. The two bottom support bodies of the other support member abut against the first horizontal segment of another first bending segment and the second horizontal segment of another second bending segment, respectively.

6. A lens driving mechanism, characterized in that, include: Base; The circuit board of claim 1, wherein the first horizontal segment and the second horizontal segment are connected to the base; An image sensor, the image sensor being located on the top surface of the top plate; A carrier, wherein the carrier is connected to the bottom surface of the top plate; A driving component, which is connected to the carrier and the base, operably drives the carrier to move the top plate in the vertical direction.

7. The lens driving mechanism according to claim 6, characterized in that, The driving component includes a magnet assembly and a coil assembly. The magnet assembly is connected to one of the base and the carrier, and the coil assembly is connected to the other of the base and the carrier. The coil assembly and the magnet assembly cooperate to drive the carrier to extend vertically.

8. The lens driving mechanism according to claim 7, characterized in that, The base includes: Base plate, Two first protrusions are spaced apart along a second direction, and each first protrusion is provided with a groove for mounting the magnet assembly. The carrier is located between the two first protrusions; The coil assembly is connected to the carrier.

9. The lens driving mechanism according to claim 8, characterized in that, The base also includes multiple rolling elements; The plurality of the rolling elements are rotatably connected to the two first bosses in the vertical direction; The carrier and the plurality of rolling elements are rotatably connected in the vertical direction.

10. The lens driving mechanism according to claim 8, characterized in that, The base also includes: The second boss is connected to the base plate; Multiple rolling elements, wherein the multiple rolling elements are rotatably connected to the second boss in the vertical direction; The carrier and the plurality of rolling elements are rotatably connected in the vertical direction.

11. The lens driving mechanism according to claim 10, characterized in that, The second boss is located at one end of the two first bosses along the first direction; The carrier is T-shaped and partially located between the second boss and the two first bosses.

12. The lens driving mechanism according to claim 10, characterized in that, The second protrusion is also provided with an adsorption magnet; The carrier is provided with a metal sheet, and the metal sheet and the adsorption magnet are arranged opposite to each other and attract each other.

13. The lens driving mechanism according to claim 8, characterized in that, The bottom surface of the carrier is also provided with an installation groove; the top wall of the installation groove is provided with a protruding winding post; The coil assembly is wound around the winding post and electrically connected to the circuit board.

14. The lens driving mechanism according to claim 8, characterized in that, The base is also equipped with a sensing magnet; The top plate is equipped with a position sensor that senses the position of the sensing magnet.

15. The lens driving mechanism according to claim 14, characterized in that, The base also includes a third protrusion, which is located on the top surface of the base plate and has a receiving groove for accommodating the inductive magnet.

16. The lens driving mechanism according to claim 8, characterized in that, The two first bending segments are located on both sides of the two first protrusions along the second direction, and the first horizontal segments of the two first bending segments are respectively connected to the bottom plate; The two second bending segments are located on both sides of the two first protrusions along the second direction, and the second horizontal segments of the two second bending segments are connected to the bottom plate; Two of the support members are arranged at intervals along the second direction, and the top support bodies of both support members are connected to the top plate. The two bottom support bodies of one support member abut against the first horizontal segment of one of the first bending segments and the second horizontal segment of one of the second bending segments, respectively. The two bottom support bodies of the other support member abut against the first horizontal segment of another first bending segment and the second horizontal segment of another second bending segment, respectively.

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