Folding receiving antenna and folding plate provided with same

By designing a foldable receiving antenna, using the folding unit and support layer of a multi-layer structure, the problems of large size, high transportation cost and poor aesthetics are solved, and the foldable and flexible angle adjustment of the antenna is realized, which improves the ultra-thin Application effects on TV.

CN222191112UActive Publication Date: 2024-12-17SHENZHEN ANTOP TECH
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Patent Information

Application Number
CN202420724770.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-09
Publication Date
2024-12-17
Estimated Expiration
2034-04-09

AI Technical Summary

Technical Problem

The existing receiving antenna is large in size and has high transportation costs. It is not beautiful enough to be installed on ultra-thin TVs, and the receiving direction is inconvenient to adjust.

Method used

A foldable receiving antenna is designed, which divides the antenna into multi-layer folding units through folding seams. It adopts a support layer, a connecting layer and a covering layer structure to realize foldable and multi-angle adjustment of the antenna, reducing thickness and packaging volume.

Benefits of technology

The antenna is foldable, which reduces transportation costs, improves the aesthetics and flexibility on ultra-thin TVs, facilitates signal adjustment, and extends service life.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of panel antennas, in particular to a folding type receiving antenna and a folding plate provided with the folding type receiving antenna, the folding type receiving antenna comprises a folding seam and a plurality of folding units divided by the folding seam, and each folding unit comprises a plurality of layers of connecting layers spanning two sides of the folding seam and a supporting layer located in the center. The covering layer covers the supporting layer in a central symmetry mode, and the antenna layer is arranged between the supporting layer and the covering layer. The problems that an antenna is large in size and high in packaging and transportation cost are solved; the receiving direction of the antenna is inconvenient; the thickness of the antenna installed on the ultra-thin television is prominent, and the antenna is not beautiful enough. The packaging size is reduced, and the transportation cost is reduced; the thickness of the antenna is improved, the aesthetic degree on an ultrathin television is improved, and the receiving angle of the antenna is convenient to change.
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Description

Technical Field

[0001] The utility model relates to the technical field of flat panel antennas, and more specifically, to a folding receiving antenna and a folding plate provided with the same. Background Art

[0002] With the popularization of wireless digital TV signals, the receiving directions of antennas of household users living in different parts of the city are different. Users want to receive TV program signals from transmission towers in more places. The original universal fixed receiving antennas are a bit difficult to meet this demand; and ordinary household high-gain antennas are large in size and have high packaging and transportation costs. The existing receiving antennas installed on ultra-thin TVs are always prominent, not thin and beautiful enough, and difficult to meet the ultimate needs of users.

[0003] In order to solve this problem, we designed a foldable antenna product for ultra-thin TVs. The folding effect can reduce the packaging volume and greatly reduce the transportation cost. At the same time, the receiving signal of the antenna can be directly adjusted by adjusting the folding angle, and the convenience of automatic adjustment is improved. In addition, the thickness of the antenna can be compressed to the extreme through the folding antenna, which improves its application flexibility on ultra-thin TVs or other ultra-thin appliances and meets customers' aesthetic needs. Utility Model Content

[0004] The utility model aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provides a foldable receiving antenna and a folding plate provided therewith, which are used to solve the technical problems that the antenna is large in size and has high packaging and transportation costs; the receiving direction of the antenna is inconvenient; and the thickness of the antenna installed on an ultra-thin TV is relatively prominent and not aesthetically pleasing.

[0005] The technical solution adopted by the utility model is a foldable receiving antenna, which includes a folding seam and a folding unit divided into several blocks by the folding seam, and the folding unit includes multiple layers, a connecting layer spanning both sides of the folding seam, a supporting layer located in the center, a covering layer centrally symmetrically covering the outside of the supporting layer, and an antenna layer arranged between the supporting layer and the covering layer.

[0006] It is beneficial to divide the folding unit into several blocks through the folding seam, so as to realize the foldability of the antenna, thereby reducing the packaging volume and reducing the transportation cost; it is beneficial to improve the thickness of the folding seam with the antenna through the multi-layer structure of the folding unit, and enhance the aesthetics of the antenna installed on the ultra-thin TV; at the same time, under the premise of not changing the stability of the folding unit, the arbitrary change of the folding angle can facilitate the change of the receiving angle of the antenna, so that the antenna is easy to receive signals; it is beneficial to provide structural support for the folding unit through the supporting layer, so as to avoid the antenna layer being unshaped when unfolded and it is difficult to fix the folding angle to stably receive signals; it is beneficial to use the connecting layer as a flexible layer to directly fit and connect with the antenna layer, so as to avoid the antenna layer being scratched in the covering layer and the supporting layer, thereby reducing the conductivity and service life; it is beneficial to use the covering layer as the outer protective layer of the folding unit, so as to protect the folding antenna from bumps during transportation.

[0007] The connection layer includes a first connection layer, and the first connection layer includes a first upper connection layer and a first lower connection layer, which are symmetrically overlapped on the upper surface and the lower surface of the support layer respectively. The covering layer is centrally symmetrically covered on the first upper connection layer and under the first lower connection layer. The antenna layer is arranged between the first upper connection layer and the support layer and / or between the first lower connection layer and the support layer.

[0008] It is beneficial to connect the folding seam on the upper surface and the lower surface of the supporting layer respectively through the first upper connecting layer and the first lower connecting layer, so that the flexible first upper connecting layer and the first lower connecting layer on the folding seam relieve the repeated folding of the antenna layer and the squeezing of the covering layer, and protect the antenna layer from being easily broken; it is beneficial to protect the first upper connecting layer and the first lower connecting layer from being damaged by external force collision during transportation through the covering layer; it is beneficial to achieve flexible adaptation to various needs of folding antennas through the clamping position and number of layers of the antenna layer.

[0009] The first connection layer spans across both sides of the folding seam and covers the upper surface of the support layer and the lower surface of the support layer to form a covering layer.

[0010] It is beneficial to use the first connection layer of flexible material as a covering layer to directly cover the upper surface and the lower surface of the support layer, thereby reducing the thickness of the covering layer and further achieving the ultra-thin effect of the folding antenna.

[0011] The covering layer is provided with an opening, and the opening is aligned with the folding seam. The covering layer includes an upper covering layer centrally symmetrically covering the upper surface of the supporting layer and a lower covering layer centrally symmetrically covering the lower surface of the supporting layer. The connecting layer also includes a second connecting layer, and the second connecting layer includes a second upper connecting layer and a second lower connecting layer, which are symmetrically overlapped on the upper covering layer and under the lower covering layer respectively. The antenna layer is arranged between the upper covering layer and the supporting layer and / or between the lower covering layer and the supporting layer.

[0012] It is beneficial to form a loose folding space with the folding seam under the hard covering layer through the opening; it is beneficial to protect the upper surface and the lower surface of the supporting layer through the upper covering layer and the lower covering layer, and sandwich the antenna layer therebetween; it is beneficial to form a protective layer for the folding seam by covering the covering layer with the second connecting layer, and also to provide a buffer for multiple foldings of the folding seam to avoid easy breaking of the antenna layer; it is beneficial to achieve flexible adaptation to various needs of the folding antenna through the clamping position and number of layers of the antenna layer.

[0013] The covering layer symmetrically covers the upper surface and the lower surface of the antenna layer to form a supporting layer.

[0014] It is beneficial to wrap the antenna layer as a whole through the covering layers on the upper and lower sides and reduce the filling of the supporting layer. The upper and lower double-layer covering layers directly serve as supporting layers, thereby further reducing the thickness of the folding antenna and increasing the flexibility of the folding antenna to adapt to ultra-thin TVs.

[0015] The edge of the covering layer is provided with a pressed edge, and the pressed edge is formed by welding the covering layer and the supporting layer or two covering layers.

[0016] It is beneficial to provide a buffer for the extrusion of the covering layer at the edge through the pressing edge at the edge of the covering layer, thereby helping to release the stress concentration at the edge of the folding antenna and improving the service life of the folding antenna; it is beneficial to simplify the manufacturing process and reduce the manufacturing cost by directly welding the covering layer and the supporting layer to form a pressing edge, or directly welding the two covering layers to form a pressing edge.

[0017] The antenna layer is a dipole antenna, and the deployment angle range of the antenna layer is 0-180°.

[0018] It is beneficial to achieve a wider working bandwidth, a farther extended frequency range, and a better balanced radiation direction through a symmetrical dipole antenna; it is beneficial to improve the stability of the received signal by changing the deployment angle between 0-180°.

[0019] A folding plate, the folding plate has a long axis direction and a short axis direction, wherein the folding plate includes n+1 folding units, n folding slits (n is an integer greater than 0) and the receiving antenna, when n=1, the folding slit is located on the central axis in the long axis or short axis direction; when n>1, the n folding slits are symmetrically distributed along the central axis in the long axis or short axis direction.

[0020] It is beneficial to combine at least two folding units into a foldable plate that can be folded in multiple directions; it is beneficial to enable the folding units to be symmetrically folded through folding seams distributed along the central axis or symmetrically distributed along the central axis, so as to better match the dipole antenna in the antenna layer and improve the stability of the antenna receiving signal.

[0021] The n+1 folding units include a central folding unit and n symmetrical folding units, and the areas of the n symmetrical folding units after folding are less than or equal to the area of ​​the central folding unit.

[0022] It is advantageous that after the n symmetrical folding units are completely folded toward the central folding unit, the symmetrical folding units are all folded within the area of ​​the central folding unit, so that the maximum area of ​​the folding plate is the area of ​​the central folding unit, thereby greatly reducing the installation volume of the folding antenna and reducing the transportation cost.

[0023] The edges of the symmetrical folding units are provided with arc-shaped chamfers, and the central axis of the central folding unit is provided with an arc-shaped concave, and the arc-shaped concave is aligned with the arc-shaped chamfers.

[0024] The arc chamfer is beneficial to avoid the formation of concentrated stress at the edges of the symmetrical folding unit during installation and transportation, and to avoid charge accumulation at the tip of the edge of the antenna layer; it is beneficial to further reduce the area of ​​the folding antenna through the arc concave aligned with the arc chamfer, and the arc concave also facilitates the installation of other fixed equipment or the superposition of multiple folding antennas.

[0025] Compared with the prior art, the beneficial effects of the utility model are: the antenna can be folded, thereby reducing the packaging volume and reducing the transportation cost; the thickness of the antenna can be improved, and the aesthetics of the antenna installed on an ultra-thin TV can be enhanced; at the same time, without changing the stability of the folding unit, the arbitrary change of the folding angle can facilitate the change of the receiving angle of the antenna, making it easier for the antenna to receive signals; it can prevent the antenna layer from being deformed when unfolded and making it difficult to fix the folding angle to stably receive signals; it can prevent the antenna layer from being scratched in the covering layer, thereby reducing the conductivity and service life; and it can protect the folding antenna from being bumped during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a cross-sectional view of a preferred embodiment of the folding unit of the utility model.

[0027] Figure 2 It is a cross-sectional view of a preferred embodiment of the folding unit of the utility model.

[0028] Figure 3 It is a cross-sectional view of a preferred embodiment of the folding unit of the utility model.

[0029] Figure 4 It is a cross-sectional view of a preferred embodiment of the folding unit of the utility model.

[0030] Figure 5 It is a schematic diagram of a preferred embodiment of the folding seam of the utility model.

[0031] Figure 6 It is a schematic diagram of a preferred embodiment of the folding seam of the utility model.

[0032] Figure 7 It is a schematic diagram of a preferred embodiment of the folding seam of the utility model.

[0033] Figure 8 It is a schematic diagram of a preferred embodiment of the folding seam of the utility model.

[0034] Fig. 9 It is a schematic diagram of a plurality of symmetrical folding units and a central folding unit of different areas of the present invention.

[0035] Description of the accompanying drawings: folding unit 10 , folding seam 20 , supporting layer 100 , first connecting layer 200 , covering layer 300 , antenna layer 400 , opening 310 , second connecting layer 500 . DETAILED DESCRIPTION

[0036] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] Example 1

[0038] The present embodiment provides a foldable receiving antenna, which includes a folding seam 20 and a folding unit 10 divided into several blocks by the folding seam 20. The folding unit 10 includes multiple layers, a connecting layer spanning both sides of the folding seam 20, a supporting layer 100 located in the center, a covering layer 300 symmetrically covering the outside of the supporting layer, and an antenna layer 400 arranged between the supporting layer 100 and the covering layer 300.

[0039] In this embodiment, the folding unit 10 of the multi-layer structure includes a connecting layer, a supporting layer 100, a covering layer 300 and an antenna layer 400. The connecting layer is used to connect the two folding units 10 on both sides of the folding seam 20. The supporting layer 100 is respectively located in the two folding units 10 and is symmetrical along the center of the folding seam 20. The covering layer 300 is arranged on the outer surface of the folding unit 10 to simultaneously and integrally cover the two folding units 10. The antenna layer 400 is made of aluminum foil or silver paste, and a thin layer is sandwiched in the multi-layer structure for receiving signals.

[0040] The connection layer includes a first connection layer 200, and the first connection layer 200 includes a first upper connection layer and a first lower connection layer, which are symmetrically overlapped on the upper surface and the lower surface of the support layer 100, respectively. The covering layer 300 is centrally symmetrically covered on the first upper connection layer and under the first lower connection layer. The antenna layer 400 is arranged between the first upper connection layer and the support layer 100 and / or between the first lower connection layer and the support layer 100.

[0041] like Figure 1 As shown, in this embodiment, the folding units 10 include three, the folding seams 20 include two, each folding seam 20 is arranged between two adjacent folding units 10, the thickness of the folding antenna is the sum of the layers, and the folding unit 10 includes six layers, with the supporting layer 100 as the central layer, a layer of the first upper connecting layer is symmetrically stacked on the upper surface of the supporting layer 100, and a layer of the first lower connecting layer is stacked on the lower surface of the supporting layer 100; then the antenna layer 400 is sandwiched between the first connecting layer 200 and the supporting layer 100, and the antenna layer 400 can be sandwiched between the supporting layer 100 and the first connecting layer 200 located on its upper surface, and can also be sandwiched between the supporting layer 100 and the first connecting layer 200 located on its upper surface and lower surface; then the covering layer 300 is symmetrically stacked outside the first upper connecting layer and the first lower connecting layer.

[0042] The first connection layer 200 spans across both sides of the folding seam 20 and covers the upper surface of the support layer 100 and the lower surface of the support layer 100 to form a covering layer 300 .

[0043] like Figure 2As shown, in this embodiment, the first connection layer 200 replaces the cover layer 300 and is coated on the outside of the folding unit 10. In this embodiment, the folding unit 10 includes three pieces, the folding seams 20 include two pieces, each folding seam 20 is arranged between two adjacent folding units 10, the thickness of the folding antenna is the sum of the layers, the folding unit 10 includes only four layers, the support layer 100 is used as the central layer, and one layer of the first connection layer 200 is symmetrically stacked on the upper and lower sides of the support layer 100, and the antenna layer 400 can be sandwiched between the support layer 100 and the first connection layer 200 located on the upper surface or lower surface thereof, and can also be sandwiched between the support layer 100 and the first connection layer 200 located on the upper surface and the lower surface thereof.

[0044] The covering layer 300 is provided with an opening 310, and the opening 310 is aligned with the folding seam 20. The covering layer 300 includes an upper covering layer centrally symmetrically covering the upper surface of the supporting layer 100 and a lower covering layer centrally symmetrically covering the lower surface of the supporting layer 100. The connecting layer also includes a second connecting layer 500, and the second connecting layer 500 includes a second upper connecting layer and a second lower connecting layer, which are symmetrically overlapped on the upper covering layer and under the lower covering layer, respectively. The antenna layer 400 is arranged between the upper covering layer and the supporting layer 100 and / or between the lower covering layer and the supporting layer 100.

[0045] like Figure 3 As shown, in this embodiment, the folding unit 10 includes three pieces, the folding seams 20 include two pieces, each folding seam 20 is arranged between two adjacent folding units 10, the thickness of the folding antenna is the sum of each layer, the folding unit 10 includes six layers, with the supporting layer 100 as the central layer, and one layer of the covering layer 300 is symmetrically stacked on the upper and lower sides of the supporting layer 100, the covering layer 300 is provided with openings 310 above and below the folding seam 20, and then the second connecting layer 500 is covered on the two openings 310, so that the two second connecting layers 500 strengthen the sealing of the opening 310 for the folding seam 20, and the antenna layer 400 is sandwiched between the supporting layer 100 and the covering layer 300.

[0046] In this embodiment, about 4 mm is cut off above the covering layer 300 opposite to the folding seam 20 as the opening 310, and the cut of the covering layer 300 is smooth to ensure that the antenna layer 400 is not scratched; then a thin and soft second connecting layer 500 is attached to the outside of the opening 310, and the second connecting layer 500 is made of PVC material with a thickness of about 0.1-0.2 mm.

[0047] The cover layer 300 symmetrically covers the upper surface and the lower surface of the antenna layer 400 to form a support layer 100 .

[0048] like Figure 4 As shown, in order to reduce the thickness of the folding antenna, the support layer 100 is removed, the cover layer 300 replaces the support function of the support layer 100, and the antenna layer 400 is sandwiched between the upper and lower layers of the cover layer 300. In this embodiment, the folding unit 10 includes three pieces, the folding seams 20 include two pieces, each folding seam 20 is arranged between two adjacent folding units 10, the thickness of the folding antenna is the sum of the layers, the folding unit 10 includes only four layers, the cover layer 300 is symmetrically superimposed on the upper and lower sides, the antenna layer 400 is directly sandwiched between the two layers of the cover layer 300, and the second connection layer 500 is symmetrically superimposed on the upper and lower surfaces of the cover layer 300.

[0049] The edge of the cover layer 300 is provided with a pressed edge, and the pressed edge is formed by welding the cover layer 300 and the support layer 100 or two cover layers 300 .

[0050] In this embodiment, the covering layer 300 and the supporting layer 100 are both relatively hard base materials with a thickness of about 0.3-0.5 mm. The pressed edge is processed by ultrasonic melting and pressing with a melting and pressing width of about 2 mm to ensure firmness. The pressed edge strengthens the edge connection sealing of the folding unit 10 and also strengthens the waterproof effect of the folding unit 10.

[0051] The antenna layer 400 is a dipole antenna, and the deployment angle range of the antenna layer 400 is 0-180°.

[0052] In this embodiment, the unfolding angle of the antenna layer 400 is any receiving angle of 0-180°, which can effectively receive radio electromagnetic wave signals transmitted from the TV transmission tower to the room after any refraction and reflection. When the aluminum foil vibrator is fully opened, that is, when the unfolding angle of the antenna layer 400 is 180°, it is the most ideal state for the folding antenna to perform fixed-point transmission and reception tests in the laboratory. In addition to aluminum foil, the dipole antenna can use metals such as copper foil and silver paste as vibrator conductors. Example 2 Example 2

[0053] A folding plate, the folding plate has a long axis direction and a short axis direction, wherein the folding plate includes n+1 folding units 10, n folding slits 20 (n is an integer greater than 0) and the receiving antenna, when n=1, the folding slits 20 are located on the central axis in the long axis or short axis direction; when n>1, the n folding slits 20 are symmetrically distributed along the central axis in the long axis or short axis direction.

[0054] In this embodiment, when the folding unit 10 has only two pieces, there is only one folding seam 20, which is located on the central axis of the folding plate, so that the folding plate can be folded or unfolded symmetrically along the central axis; when the folding unit 10 has three or more pieces, the folding plate can be folded or unfolded along the folding seams 20 symmetrically distributed along the central axis.

[0055] like Figure 5 , 6 As shown, in this embodiment, when n is 2, the folding unit 10 includes three pieces, the folding plates are symmetrically folded along the central axis in the short axis direction, and the folding seams 20 include two pieces, which are located on both sides of the central axis in the short axis direction.

[0056] like Figure 7 As shown, in this embodiment, n is 1, the folding unit 10 includes two, the folding plates are folded symmetrically along the central axis in the long axis direction, and the folding seam 20 is located on the central axis.

[0057] like Figure 8 As shown, in this embodiment, n is 2, the folding unit 10 includes three pieces, the folding plates are symmetrically folded along the central axis in the long axis direction, and the folding seams 20 include two pieces, which are located on both sides of the central axis in the long axis direction.

[0058] The n+1 folding units include a central folding unit and n symmetrical folding units, and the areas of the n symmetrical folding units after folding are less than or equal to the area of ​​the central folding unit.

[0059] like Fig. 9 As shown, in this embodiment, multiple symmetrical folding units with different areas are symmetrically distributed along the central axis of the short axis direction of the folding plate. When the multiple symmetrical folding units are folded, the minimum area that the folding plate can be folded is the area of ​​the central folding unit.

[0060] The edges of the symmetrical folding units are provided with arc-shaped chamfers, and the central axis of the central folding unit is provided with an arc-shaped concave, and the arc-shaped concave is aligned with the arc-shaped chamfers.

[0061] like Figure 5 , 6 As shown, in this embodiment, the symmetrical folding units include two, and the two symmetrical folding units are rectangular, and the two corners close to the outer edges are chamfered, the upper edge of the central folding unit is concave, and the lower edge is used for external signal terminals, and after the two symmetrical folding units are folded, the arc chamfers of the symmetrical folding units are aligned with the arc concave of the central folding unit.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A foldable receiving antenna, characterized in that: It includes a folding seam and a folding unit divided into several blocks by the folding seam, and the folding unit includes multiple layers, a connecting layer spanning both sides of the folding seam, a supporting layer located in the center, a covering layer centrally symmetrically covering the outside of the supporting layer, and an antenna layer arranged between the supporting layer and the covering layer.

2. A foldable receiving antenna according to claim 1, characterized in that: The connection layer includes a first connection layer, and the first connection layer includes a first upper connection layer and a first lower connection layer, which are symmetrically overlapped on the upper surface and the lower surface of the support layer respectively. The covering layer is centrally symmetrically covered on the first upper connection layer and under the first lower connection layer. The antenna layer is arranged between the first upper connection layer and the support layer and / or between the first lower connection layer and the support layer.

3. A foldable receiving antenna according to claim 2, characterized in that: The first connection layer spans across both sides of the folding seam and covers the upper surface of the support layer and the lower surface of the support layer to form a covering layer.

4. A foldable receiving antenna according to claim 1, characterized in that: The covering layer is provided with an opening, and the opening is aligned with the folding seam. The covering layer includes an upper covering layer centrally symmetrically covering the upper surface of the supporting layer and a lower covering layer centrally symmetrically covering the lower surface of the supporting layer. The connecting layer also includes a second connecting layer, and the second connecting layer includes a second upper connecting layer and a second lower connecting layer, which are symmetrically overlapped on the upper covering layer and under the lower covering layer respectively. The antenna layer is arranged between the upper covering layer and the supporting layer and / or between the lower covering layer and the supporting layer.

5. A foldable receiving antenna according to claim 4, characterized in that: The covering layer symmetrically covers the upper surface and the lower surface of the antenna layer to form a supporting layer.

6. A foldable receiving antenna according to any one of claims 2, 4 or 5, characterized in that: The edge of the covering layer is provided with a pressed edge, and the pressed edge is formed by welding the covering layer and the supporting layer or two covering layers.

7. A foldable receiving antenna according to any one of claims 1 or 3, characterized in that: The antenna layer is a dipole antenna, and the deployment angle range of the antenna layer is 0-180°.

8. A folding plate, the folding plate having a long axis direction and a short axis direction, characterized in that: It comprises n+1 folding units, n folding slits (n is an integer greater than 0) and the receiving antenna according to any one of claims 1, 3 or 6, wherein when n=1, the folding slit is located on the central axis in the major axis or minor axis direction; when n>1, the n folding slits are symmetrically distributed along the central axis in the major axis or minor axis direction.

9. A folding plate according to claim 8, characterized in that: The n+1 folding units include a central folding unit and n symmetrical folding units, and the areas of the n symmetrical folding units after folding are less than or equal to the area of ​​the central folding unit.

10. A folding plate according to claim 9, characterized in that: The edges of the symmetrical folding units are provided with arc-shaped chamfers, and the central axis of the central folding unit is provided with an arc-shaped concave, and the arc-shaped concave is aligned with the arc-shaped chamfers.