阅读说明：本技术 一种薄型手表防震结构 (Thin watch shockproof structure ) 是由 魏浚宏 朱应林 李超 陈江 张云 于 2021-01-20 设计创作，主要内容包括：本发明涉及手表结构技术领域,具体公开了一种兼顾手表厚度与防震性能的薄型手表防震结构,包括表壳体、设于表壳体顶部并与表壳体过盈配合的前圈、设于表壳体底部的后盖以及设于机芯与表壳体之间的减震件,表壳体、前圈及后盖合围形成收容有机芯的表内空间,减震件包括分别由弹性材料制成且相互卡接的下内罩和上内罩,下内罩底部设有与后盖轴向抵接配合构成第一减震区的第一凸位,下内罩内壁与机芯接触构成第一接触区,上内罩外壁设有与表壳体内壁抵接配合构成第二减震区的第二凸位,上内罩内壁与机芯接触构成第二接触区；第一减震区及第二减震区分别用于为机芯提供轴向和径向防震保护,第一接触区及第二接触区用于柔性包覆机芯。(The invention relates to the technical field of watch structures, and particularly discloses a thin watch shockproof structure with both watch thickness and shockproof performance, which comprises a watch shell, a front ring, a rear cover and a shock absorbing piece, wherein the front ring is arranged at the top of the watch shell and is in interference fit with the watch shell, the rear cover is arranged at the bottom of the watch shell, and the shock absorbing piece is arranged between a movement and the watch shell; the first vibration absorption area and the second vibration absorption area are respectively used for providing axial and radial vibration absorption protection for the movement, and the first contact area and the second contact area are used for flexibly coating the movement.)

1. A thin watch shockproof structure comprises a watch shell, a front ring arranged at the top of the watch shell and in interference fit with the watch shell, and a rear cover arranged at the bottom of the watch shell, wherein the watch shell, the front ring and the rear cover surround to form a watch space, and a movement is accommodated in the watch space;

the shock absorption piece comprises a lower inner cover and an upper inner cover which are made of elastic materials and clamped with each other, a first convex position is arranged at the bottom of the lower inner cover, the first convex position is in axial butt fit with the rear cover to form a first shock absorption area, the inner wall of the lower inner cover is in contact with the outer wall of the movement to form a first contact area, a second convex position is arranged on the outer wall of the upper inner cover, the second convex position is in butt fit with the inner wall of the watch shell to form a second shock absorption area, and the inner wall of the upper inner cover is in contact with the outer wall of the movement to form a second contact area;

the first vibration absorption area is used for providing axial vibration absorption protection for the movement, and the second vibration absorption area is used for providing radial vibration absorption protection for the movement; the first contact area and the second contact area are used for flexibly coating the movement and providing damping protection for the movement.

2. The thin watch shock-proof structure according to claim 1, wherein a top surface of the upper inner cover protrudes toward a center direction of the upper inner cover to form a third protruding portion, and a bottom surface of the third protruding portion abuts against the movement to limit axial displacement of the movement and provide axial shock-absorbing protection for the movement.

3. The thin watch shock absorbing structure of claim 2, wherein the cross-sections of the first protrusion, the second protrusion and the third protrusion are arc-shaped or wave-shaped structures.

4. The thin watch shock-proof structure according to claim 3, wherein the number of the first protrusions, the number of the second protrusions, and the number of the third protrusions are three or more, respectively, each of the first protrusions is uniformly provided at the bottom of the lower inner cover in the circumferential direction, each of the second protrusions is uniformly provided at the outer wall of the upper inner cover in the circumferential direction, and each of the third protrusions is uniformly provided at the top of the inner wall of the upper inner cover in the circumferential direction.

5. The thin watch shock-proof structure of claim 4, wherein a plurality of first hollow space-avoiding portions extending in a radial direction and corresponding to the first protrusions one by one are uniformly formed on the circumference of the lower inner cover, and a plurality of second hollow space-avoiding portions extending in an axial direction and corresponding to the second protrusions one by one are uniformly formed on the circumference of the upper inner cover.

6. The thin watch shock-proof structure according to claim 5, wherein a first truncated cone and a second truncated cone concentric with the first truncated cone and arranged at the outer edge of the first truncated cone are arranged at the bottom of the upper inner cover, the height of the first truncated cone is smaller than that of the second truncated cone, the third protrusion is arranged on the inner wall of the first truncated cone, and the bottom surface of the first truncated cone is matched with the top surface of the lower inner cover.

7. The thin watch shockproof structure of claim 6, wherein the second circular truncated cone is provided with a limiting notch extending through the top of the second circular truncated cone and extending to the bottom, the depth of the limiting notch being less than the height of the second circular truncated cone, and a guiding notch extending through the bottom of the second circular truncated cone and extending to the top, the depth of the guiding notch being less than the height of the second circular truncated cone, the limiting notch is communicated with the guiding notch, the limiting notch is communicated with the bottom space of the first circular truncated cone to extend through the inner side and the outer side of the upper inner cover, and a fixture block entering the limiting notch through the guiding notch and being in limiting fit with the limiting notch is arranged on the outer wall of the lower inner cover.

8. The thin watch shock-proof structure of claim 7, wherein the difference between the depth of the guide notch and the height of the second truncated cone is equal to or less than the height of the first truncated cone.

9. The thin watch shockproof structure according to claim 8, wherein the upper inner cover is provided with a clearance hole penetrating through the top of the upper inner cover and respectively communicating with the guide notch and the limit notch, a spring plate capable of swinging relative to the clearance hole and partially embedded into the clearance hole in an inclined manner is formed on the outer wall of the upper inner cover corresponding to the clearance hole, and the outer side wall of the spring plate is provided with the second convex portion.

10. The thin watch shockproof structure according to any one of claims 1 to 9, wherein the lower inner cover and the upper inner cover are each made of an amorphous alloy.

Technical Field

The invention relates to the technical field of watch structures, in particular to a thin watch shockproof structure.

Background

In the wearing process of the watch, in order to adapt to different life scenes, sports behaviors and the like of a user, the watch is often required to have a good shockproof function, so that the problem that the watch hand rotates in a failure mode or even the watch fails due to the fact that the movement is vibrated is avoided, and the watch is guaranteed to be reliably used. Specifically, to wrist-watch self structure, the cooperation is accurate between each subassembly of the wrist-watch of normal work, and the wrist-watch performance is closely related rather than the assembly reliability, and if the shock-proof capacity of wrist-watch is weak, easily make the wrist-watch appear instructing the not hard up aversion of subassembly and core subassembly because of receiving the tremble in daily use, influence the wrist-watch function. The traditional thin watch has limited inner space, cannot be provided with a complex damping structure and provide reliable shock resistance, so that the shock resistance of the thin watch is poor, the application scene of the thin watch is limited, and the market competitiveness of the thin watch is not favorably improved.

Disclosure of Invention

Therefore, it is necessary to provide a thin watch shockproof structure that combines the thickness and shockproof performance of the watch to solve the technical problems that the damping mechanism is not easy to install due to limited internal space and the watch shockproof performance is poor.

A thin watch shockproof structure comprises a watch shell, a front ring and a rear cover, wherein the front ring is arranged at the top of the watch shell and is in interference fit with the watch shell, the rear cover is arranged at the bottom of the watch shell, the front ring and the rear cover surround to form a watch inner space, a movement is accommodated in the watch inner space, and the thin watch shockproof structure further comprises a damping piece arranged between the movement and the watch shell;

the shock absorption piece comprises a lower inner cover and an upper inner cover which are made of elastic materials and clamped with each other, a first convex position is arranged at the bottom of the lower inner cover, the first convex position is in axial butt fit with the rear cover to form a first shock absorption area, the inner wall of the lower inner cover is in contact with the outer wall of the movement to form a first contact area, a second convex position is arranged on the outer wall of the upper inner cover, the second convex position is in butt fit with the inner wall of the watch shell to form a second shock absorption area, and the inner wall of the upper inner cover is in contact with the outer wall of the movement to form a second contact area;

the first vibration absorption area is used for providing axial vibration absorption protection for the movement, and the second vibration absorption area is used for providing radial vibration absorption protection for the movement; the first contact area and the second contact area are used for flexibly coating the movement and providing damping protection for the movement.

In one embodiment, the top surface of the upper inner cover protrudes towards the center direction of the upper inner cover to form a third protruding position, and the bottom surface of the third protruding position abuts against the movement to limit the axial displacement of the movement and provide axial shock absorption protection for the movement.

In one embodiment, the cross sections of the first convex part, the second convex part and the third convex part are arc-shaped or wavy structures respectively.

In one embodiment, the number of the first protruding portions, the number of the second protruding portions, and the number of the third protruding portions are respectively three or more, each of the first protruding portions is uniformly arranged at the bottom of the lower inner cover along the circumferential direction, each of the second protruding portions is uniformly arranged at the outer wall of the upper inner cover along the circumferential direction, and each of the third protruding portions is uniformly arranged at the top of the inner wall of the upper inner cover along the circumferential direction.

In one embodiment, a plurality of first hollow-out avoiding portions extending in the radial direction and corresponding to the first protrusions one by one are uniformly formed in the circumferential direction of the lower inner cover, and a plurality of second hollow-out avoiding portions extending in the axial direction and corresponding to the second protrusions one by one are uniformly formed in the circumferential direction of the upper inner cover.

In one embodiment, the bottom of the upper inner cover is provided with a first round table and a second round table concentrically arranged with the first round table and arranged at the outer edge of the first round table, the height of the first round table is smaller than that of the second round table, the third convex position is arranged on the inner wall of the first round table, and the bottom surface of the first round table is matched with the top surface of the lower inner cover.

In one of the embodiments, set up on the second round platform and run through the top of second round platform and to bottom extension, the degree of depth is less than the spacing breach of second round platform height and run through the bottom of second round platform and to top extension, the degree of depth is less than the direction breach of second round platform height, spacing breach with direction breach intercommunication, spacing breach with the bottom space intercommunication of first round platform is in order to link up go up the inside and outside of inner cover, be equipped with on the outer wall of lower inner cover via the direction breach gets into spacing breach and with spacing complex fixture block of spacing breach.

In one embodiment, the difference between the depth of the guide notch and the height of the second circular truncated cone is equal to or smaller than the height of the first circular truncated cone.

In one embodiment, the upper inner cover is provided with a position-avoiding hole which penetrates through the top of the upper inner cover and is respectively communicated with the guide notch and the limiting notch, an elastic sheet which can swing relative to the position-avoiding hole and is partially embedded into the position-avoiding hole in an inclined manner is formed on the outer wall of the upper inner cover corresponding to the position-avoiding hole, and the outer side wall of the elastic sheet is provided with the second convex position.

In one embodiment, the lower inner cover and the upper inner cover are made of amorphous alloy, respectively.

The invention is implemented the thin watch shockproof structure, set up the shock attenuation spare formed by lower inner cover and upper inner cover between movement and watch casing, the shock attenuation spare is made of elastic material, cooperate with the back cover through the first convex position set up on the lower inner cover, in order to buffer the axial impact force that the movement and back cover receive, cooperate with the butt of the watch casing through the second convex position set up on the upper inner cover, in order to buffer the radial impact force that the movement and watch casing receive, and the inner wall of the lower casing and inner wall of the upper casing are coated separately and contacted with the outer wall of the movement and cooperated, have realized the shockproof protection to the movement, the shock attenuation spare only occupies the radial width between movement and watch casing, and does not influence the thin thickness of the watch, fully utilize the watch inner space of the thin watch, like this, only need to set up the reservation position of the shock attenuation spare between movement and watch casing and can install the shock attenuation spare in the thin watch, the thickness and the shock resistance of the watch are considered, the mounting difficulty of the shock absorption piece is reduced, and the market competitiveness of the thin watch is favorably improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a portion of a shock absorbing structure of a thin watch according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a lower inner cover according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an upper inner cover according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an assembly structure of the lower inner cover and the upper inner cover according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1, the present invention provides a thin watch shockproof structure 10 with both thickness and shockproof performance of the watch, the thin watch shockproof structure 10 includes a watch case 100, a front ring 200 disposed on the top of the watch case 100 and in interference fit with the watch case 100, and a rear cover 300 disposed at the bottom of the watch case 100, the front ring 200, and the rear cover 300 surround to form an watch space 400, and the watch space 400 accommodates a movement 500 therein. The thin watch shockproof structure 10 further comprises a shock absorbing member 600 disposed between the movement 500 and the watch case 100, that is, the shock absorbing member 600 only occupies the radial width between the movement 500 and the watch case 100 to fully utilize the watch internal space 400 of the thin watch, so as to reduce the influence of the shock absorbing member 600 on the thickness of the thin watch. It should be noted that, in this embodiment, the radial direction of the movement 500 refers to a direction pointing to the edge of the movement 500 along the middle of the movement 500, the axial direction refers to the thickness direction of the thin watch, and the circumferential direction refers to the circumferential direction taking the middle of the movement 500 as the center, and other embodiments can be explained with reference to this.

The shock absorber 600 comprises a lower inner cover 610 and an upper inner cover 620 which are made of elastic materials and clamped with each other, preferably, the lower inner cover 610 and the upper inner cover 620 are made of amorphous alloys respectively, the amorphous alloys can be one of zirconium-based amorphous alloys, iron-based amorphous alloys, copper-based amorphous alloys, titanium-based amorphous alloys and palladium-based amorphous alloys, the elastic limit of the amorphous alloys can reach 1.5% -2.8%, the hardness reaches 430-700 HV, and the yield strength is greater than 1000 MPa.

Referring to fig. 2 and 3, the bottom of the lower inner cover 610 is provided with a first protrusion 611, the first protrusion 611 is axially abutted and matched with the rear cover 300 to form a first damping region, the inner wall of the lower inner cover 610 is contacted with the outer wall of the movement 500 to form a first contact region, the outer wall of the upper inner cover 620 is provided with a second protrusion 621, the second protrusion 621 is abutted and matched with the inner wall of the watch case 100 to form a second damping region, and the inner wall of the upper inner cover 620 is contacted with the outer wall of the movement 500 to form a second contact region; the first shock absorption area is used for providing axial shock absorption protection for the movement 500, and the second shock absorption area is used for providing radial shock absorption protection for the movement 500; the first contact area and the second contact area are used for flexibly wrapping the movement 500 and providing shock absorption protection for the movement 500.

Specifically, when the rear cover 300 is impacted by the outside, the mechanical energy generated by the impact and received by the rear cover 300 is transmitted to the lower inner cover 610 through the first protruding portion 611 and is stored in the lower inner cover 610 in the form of elastic potential energy, in this case, because the inner wall of the lower inner cover 610 covers the outer wall of the movement 500, the deformation amount at the inner wall of the lower inner cover 610 is extremely small, and the potential energy transmitted to the movement 500 from the inner wall of the lower inner cover 610 is extremely small, thereby realizing the axial shockproof protection of the movement 500. Similarly, when the watch case 100 is impacted by the outside, the watch case 100 transmits the mechanical energy generated by the impact to the upper inner cover 620 through the second convex portion 621, and stores the mechanical energy in the form of elastic potential energy in the upper inner cover 620, and because the inner wall of the upper inner cover 620 covers the outer wall of the movement 500, the elastic potential energy transmitted from the second convex portion 621 to the inner wall of the upper inner cover 620 is extremely small, so that the potential energy transmitted from the inner wall of the upper inner cover 620 to the movement 500 is extremely small, and the radial shockproof protection of the movement 500 is realized.

Referring to fig. 3, in an embodiment, a top surface of the upper inner cover 620 protrudes toward a center of the upper inner cover 620 to form a third protruding portion 622, and a bottom surface of the third protruding portion 622 abuts against the movement 500 to limit axial displacement of the movement 500 and provide axial shock absorption protection for the movement 500. Preferably, the bottom surface of the third protruding portion 622 is a plane, so that the contact area between the third protruding portion 622 and the movement 500 is increased, and the connection stability between the third protruding portion 622 and the movement is further improved. Further, the top of going up inner cover 620 still is equipped with the spacing complex dial plate 700 of preceding circle 200, so, go up inner cover 620 and lower inner cover 610 and inject respectively with core 500 tight fit under dial plate 700 and back lid 300 jointly to cladding core 500 realizes spacing to core 500, prevents that core 500 that causes when core 500 and damper 600 junction have the gap shakes the problem because of receiving the impact, thereby promotes the shockproof performance of slim wrist-watch.

In an embodiment, the cross sections of the first protruding portion 611, the second protruding portion 621, and the third protruding portion 622 are arc-shaped or wavy structures, respectively. The cross sections of the first convex position 611, the second convex position 621 and the third convex position 622 are arranged to be of arc-shaped structures or wavy structures, so that the material usage amount of the upper inner cover 620 and the lower inner cover 610 is reduced while the positioning arrangement of the upper inner cover 620 and the lower inner cover 610 is facilitated, and the production cost and the whole weight of the thin watch are reduced.

Referring to fig. 2 and 3, in an embodiment, the number of the first protruding portions 611, the number of the second protruding portions 621, and the number of the third protruding portions 622 are three or more, each of the first protruding portions 611 is uniformly arranged at the bottom of the lower inner cover 610 along the circumferential direction, each of the second protruding portions 621 is uniformly arranged at the outer wall of the upper inner cover 620 along the circumferential direction, and each of the third protruding portions 622 is uniformly arranged at the top of the inner wall of the upper inner cover 620 along the circumferential direction. Through evenly setting up a plurality of first protruding positions 611 and third protruding position 622 on last inner cover 620, evenly set up a plurality of second protruding positions 621 on inner cover 610 down, the connector stress balance that upper inner cover 620 and table casing 100 and core 500 constitute has been guaranteed, the connector stress balance that forms when having guaranteed lower inner cover 610 and back lid 300 contact simultaneously, that is, the table inner space 400 each spare part complex stability of slim wrist-watch has been promoted, be favorable to promoting the performance of slim wrist-watch.

Further, in an embodiment, the lower inner cover 610 has a plurality of first hollow space avoidance portions 612 extending along the radial direction and corresponding to the first protruding portions 611 one by one, and the upper inner cover 620 has a plurality of second hollow space avoidance portions 623 extending along the axial direction and corresponding to the second protruding portions 621 one by one. Thus, after the thin watch is assembled, when any one of the back cover 300 or the watch case 100 is subjected to an external impact force, the mechanical energy generated by the external impact is transmitted to the lower inner cover 610 through the first protrusion 611 or transmitted to the upper inner cover 620 through the second protrusion 621, and during the process, the part around the first protrusion 611 or the part around the second protrusion 621 generates an elastic deformation, the deformation can be pressed towards the first hollow space 612 or the second hollow space 623, in other words, the arrangement of the first hollow space 612 and the second hollow space 623 increases the elastic deformation capability of the lower inner cover 610 and the upper inner cover 620, the first protrusion 611 is compressed when being pressed by the back cover 300 to achieve the flexible matching of the lower inner cover 610 and the back cover 300, and similarly, the second protrusion 621 is compressed when being pressed by the watch case 100 to achieve the flexible matching of the upper inner cover 620 and the watch case 100, thereby achieving the shock absorption protection and the shock absorption protection, the stability of the connection of the parts of the surface space 400 is improved.

Referring to fig. 3 and 4, in an embodiment, a first truncated cone 624 and a second truncated cone 625 concentric with the first truncated cone 624 and disposed at an outer edge of the first truncated cone 624 are disposed at a bottom of the upper inner cover 620, a height of the first truncated cone 624 is smaller than a height of the second truncated cone 625, the third protrusion 622 is disposed on an inner wall of the first truncated cone 624, and a bottom surface of the first truncated cone 624 is matched with a top surface of the lower inner cover 610. Further, in an embodiment, the second circular truncated cone 625 is provided with a limit notch 626 penetrating through the top of the second circular truncated cone 625 and extending towards the bottom, the depth of the limit notch 626 being smaller than the height of the second circular truncated cone 625, and a guide notch 627 penetrating through the bottom of the second circular truncated cone 625 and extending towards the top, the depth of the guide notch 627 being smaller than the height of the second circular truncated cone 625, the limit notch 626 is communicated with the guide notch 627, the limit notch 626 is communicated with the bottom space of the first circular truncated cone 624 to penetrate through the inner side and the outer side of the upper inner cover 620, and a fixture block 613 entering the limit notch 626 through the guide notch 627 and being in limit fit with the limit. It can be understood that the limiting notch 626 and the guiding notch 627 together form a bayonet for limiting the position of the fixture block 613, in an embodiment, the second circular truncated cone 625 is uniformly provided with a plurality of bayonets, and the number of the fixture blocks 613 corresponds to the bayonets one to one, so that in the assembling and combining process of the lower inner cover 610 and the upper inner cover 620, only the fixture blocks 613 on the lower inner cover 610 need to be embedded into the corresponding guiding notches 627 one to one, when the position of the fixture block 613 in the guiding notches 627 is flush with the communicating portion of the guiding notches 627 and the limiting notch 626, the lower inner cover 610 is rotated relative to the upper inner cover 620 until the fixture block 613 enters the limiting notch 626, and thus, the fixture block 613 is difficult to shake relative to the upper inner cover 620 under the constraint of the inner wall of the limiting notch 626, and thus the axial positioning of the lower inner cover 610 and the.

It should be further noted that, in an embodiment, the difference between the depth of the guiding notch 627 and the height of the second circular truncated cone 625 is equal to or less than the height of the first circular truncated cone 624. It can be understood that the inner top surface of the guiding notch 627 is flush with the bottom surface of the second circular truncated cone 625 or is higher than the bottom surface of the second circular truncated cone 625, so as to avoid the problem that the fixture block 613 is difficult to pass through due to the fact that the communicating position of the guiding notch 627 and the limiting notch 626 is too narrow, and thus, the assembling and disassembling difficulty of the lower inner cover 610 and the upper inner cover 620 is reduced.

Referring to fig. 3 again, in an embodiment, the upper inner cover 620 is provided with a position-avoiding hole 628 penetrating through the top of the upper inner cover 620 and respectively communicating with the guiding notch 627 and the limiting notch 626, a resilient sheet 629 capable of swinging relative to the position-avoiding hole 628 and partially embedded into the position-avoiding hole 628 is formed on the outer wall of the upper inner cover 620 corresponding to the position-avoiding hole 628, and a second protruding portion 621 is formed on the outer side wall of the resilient sheet 629. Thus, when the watch case 100 is vibrated or impacted by the outside, the second convex portion 621 of the elastic piece 629 is squeezed by the watch case 100 and transmits the acting force to the elastic piece 629, so that the elastic piece 629 is bent under the force and embedded into the avoiding hole 628, and thus, the mechanical energy generated when the watch case 100 is vibrated is transmitted to the elastic piece 629 through the second convex portion 621 and converted into the elastic potential energy of the elastic piece 629, thereby avoiding or reducing the deformation amount at the inner wall of the upper inner cover 620, and achieving the shockproof or damping effect on the movement 500.

The thin watch shockproof structure 10 implementing the invention is characterized in that a shock absorbing member 600 consisting of a lower inner cover 610 and an upper inner cover 620 is arranged between a movement 500 and a watch case 100, the shock absorbing member 600 is made of elastic material, is in butt fit with a back cover 300 through a first convex position 611 arranged on the lower inner cover 610 and is used for buffering the axial impact force applied to the movement 500 and the back cover 300, is in butt fit with the watch case 100 through a second convex position 621 arranged on the upper inner cover 620 and is used for buffering the radial impact force applied to the movement 500 and the watch case 100, the inner wall of the lower case and the inner wall of the upper case are respectively coated and are in contact fit with the outer wall of the movement 500, the shockproof protection of the movement 500 is realized, the shock absorbing member 600 only occupies the radial width between the movement 500 and the watch case 100 and does not influence the thickness of the thin watch, the watch inner space 400 of the thin watch is fully utilized, and thus, the shock absorbing member 600 can be installed in the thin watch only by arranging the reserved position of the shock absorbing member 600 between the movement 500 and, the thickness and the shock resistance of the watch are considered, the installation difficulty of the shock absorbing piece 600 is reduced, and the market competitiveness of the thin watch is promoted.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.