CN113183657A - Exhibition type three-dimensional book with large three-dimensional scene in spread mode - Google Patents

Abstract

The invention discloses a display type three-dimensional book with a large spread three-dimensional scene, which comprises a bottom plate and a folding body, wherein the bottom plate can be folded along the central line of the bottom plate; the folding body is bonded on the bottom plate and can be folded along the central line of the bottom plate, the folding body comprises a multi-layer folding structure and a vertical structure, a V-shaped knife edge is formed in the bottom plate, two side edges of the multi-layer folding structure are connected with the V-shaped knife edge, and the bottom edge of the vertical structure is bonded on the bottom plate along two sides of the central line of the bottom plate; the multilayer folding structure takes the central line as a symmetry axis and is folded forwards and backwards in sequence along the direction parallel to the symmetry axis. The invention adopts a multilayer folding structure, the extension range of the opened book is larger, the area is larger to accommodate more vertical structures, more importantly, the extension structure can be smoothly retracted into the book when the book is closed, and the interestingness, the attraction and the sensory enjoyment of the paper book are improved.

Description

Exhibition type three-dimensional book with large three-dimensional scene in spread mode

Technical Field

The invention relates to a cultural appliance, in particular to a spread large three-dimensional scene display type three-dimensional book.

Background

The books are knowledge carriers, the knowledge spreading function is achieved, since the invention of Chualen made paper, the paper books play an extremely important role in the knowledge spreading, the paper books are too many types in the development process, but the basic structures and the shapes of the books do not change greatly, the basic structures and the shapes of the books are all two-dimensional forms of paper pages as units, the forms are single, and the paper books only play a role of carriers.

With the rapid development of society, electronic books gradually permeate into our lives, but reading the electronic books cannot bring the sensory enjoyment to people, and cannot feel the satisfaction brought to people by turning paper, so that the paper type books still have wide market space. With the increasing demand of people for living quality, the demand of paper books is also higher, and how to improve the interest, attraction and sensory enjoyment of the paper books is the improvement direction of the paper books.

The existing three-dimensional book has the problems that pages can be unfolded towards the back plane when opened but cannot be automatically retracted, manual assistance is needed for retraction, and the book is easy to break and damage.

Disclosure of Invention

Aiming at the defects and shortcomings in the prior art, the invention aims to provide a large-spread three-dimensional scene display type three-dimensional book, which can enable a paper type with large extension range in the horizontal direction to be successfully retracted into a bottom plate, and improve the reading experience of readers.

The technical scheme of the invention is as follows: a spread large three-dimensional scene display type three-dimensional book comprises a bottom plate and a folding body,

the bottom plate can be folded along the central line;

the folding body is bonded on the bottom plate and can be folded along the central line of the bottom plate, the folding body comprises a multi-layer folding structure and a vertical structure, a V-shaped knife edge is formed in the bottom plate, two side edges of the multi-layer folding structure are connected with the V-shaped knife edge, and the bottom edge of the vertical structure is bonded on the bottom plate along two sides of the central line of the bottom plate;

the multilayer folding structure takes the central line as a symmetry axis and is folded forwards and backwards in sequence along the direction parallel to the symmetry axis.

Preferably, the multilayer folding structure is divided into a first area, a second area, a third area, a fourth area, a fifth area, a sixth area, a seventh area, an eighth area, a ninth area and a tenth area by a first reverse folding line, a second forward folding line, a third reverse folding line, a fourth forward folding line, a fourth reverse folding line, a eighth forward folding line and a ninth reverse folding line;

and the connecting line of the centers of the first area and the second area and the connecting line of the centers of the ninth area and the tenth area respectively form an included angle of 45 degrees with the extension line of the top edge of the multilayer folding structure.

Preferably, the fifth folding line comprises a fifth positive folding line and a fifth negative folding line, and when the multi-layer folding structure is completely unfolded, an extension line of the fifth positive folding line coincides with an extension line of the fifth negative folding line, wherein the fifth positive folding line is close to the bottom plate.

Preferably, the fourth positive folding line, the fifth reverse folding line, the fifth positive folding line and the sixth positive folding line are parallel to each other.

Preferably, a first region divided by the first reverse folding line and one side edge of the multi-layer folding structure is equal to a tenth region divided by a ninth reverse folding line and the other side edge of the multi-layer folding structure, a second region divided by the first reverse folding line and the second forward folding line is equal to a ninth region divided by the eighth forward folding line and the ninth reverse folding line, a third region divided by the second forward folding line and the third reverse folding line is equal to an eighth region divided by the seventh reverse folding line and the eighth forward folding line, a fourth region divided by the third reverse folding line, the fourth forward folding line and the fifth forward folding line is equal to a seventh region divided by the fifth forward folding line, the sixth forward folding line and the seventh reverse folding line, and a fifth region divided by the fourth forward folding line and the fifth reverse folding line is equal to a sixth region divided by the fifth reverse folding line and the sixth forward folding line.

Preferably, the vertical structure comprises a first vertical assembly adhered to one side of the bottom plate and a second vertical assembly adhered to the other side of the bottom plate;

the first vertical assembly comprises a first member, a second member, a third member, a fourth member and a fifth member which are connected through a first connecting piece, the first member, the second member, the third member, the fourth member and the fifth member are parallel to each other, one end of the first connecting piece is bonded with the first member, the other end of the first connecting piece is clamped on the fifth member, and one side of the fifth member is clamped on the first area;

the second vertical assembly comprises a sixth member, a seventh member, an eighth member, a ninth member and a tenth member which are connected through a second connecting piece, the sixth member, the seventh member, the eighth member, the ninth member and the tenth member are parallel to each other, one end of the second connecting piece is bonded with the sixth member, the other end of the second connecting piece is clamped on the tenth member, and one side of the tenth member is clamped on the tenth area.

Preferably, the vertical structure further comprises a middle connecting piece for connecting the first member and the sixth member, the middle connecting piece comprises a first part, a first folding section and a second folding section are respectively arranged on two sides of the first part, the first folding section is connected with the first member, the second folding section is connected with the sixth member, and a first bonding section and a second bonding section which are bonded with the bottom plate are respectively arranged on the bottom edge of the first part;

the first part can be folded along the central line of the first part along with the folding of the bottom plate.

Preferably, the paper-type connecting piece further comprises two arc-shaped connecting pieces which are arranged on the first part along two sides of the central line of the first part in a staggered mode, the arc-shaped connecting pieces are formed by arc-shaped knife edges formed in the first part, and paper types are respectively bonded on the two arc-shaped connecting pieces.

Preferably, the first part, the first folding section, the first member, the second folding section, the sixth member, the first bonding section and the second bonding section are integrally formed.

Preferably, the top of the fifth member and the top of the tenth member are both provided with a double-layer structure, the double-layer structure comprises a first layer of pages and a second layer of pages, the first layer of pages are respectively bonded with the fifth member or the tenth member through two connecting sections, the second layer of pages are positioned between the first layer of pages and the fifth member or between the first layer of pages and the tenth member, and the second layer of pages are bonded on the connecting sections.

Compared with the prior art, the invention has the advantages that:

(1) the multi-layer folding structure is adopted, the folding lines are arranged on the multi-layer folding structure, so that the bottom plate can have a wider extension surface on a horizontal plane when being opened, and the vertical structure can be quickly and smoothly contracted back into a book through the folding lines when the bottom plate is closed, so that a three-dimensional paper type structure with a larger area is formed, more three-dimensional plug-ins can be adhered, a three-dimensional scene is enriched, and the reading experience can be greatly improved by smoothly and quickly retracting the vertical structure;

(2) according to the invention, through the bonding and folding of the paper-type structure, the extension area of the three-dimensional structure is further increased, the page width in the horizontal direction is increased, and the interestingness, attraction and sensory enjoyment of the paper-type book are greatly increased.

Drawings

FIG. 1 is a schematic view of the bonding of a base plate to a portion of a structure according to the present invention;

FIG. 2 is a schematic structural view of a multi-layer folded structure according to the present invention;

FIG. 3 is a schematic structural view of a first folded section, a first member, a second folded section, a sixth member, a first adhesive section and a second adhesive section of the present invention formed integrally;

description of reference numerals:

1-bottom plate, 1-1-V type blade;

2-multilayer folding structure, 2-1-first reverse folding line, 2-2-second forward folding line, 2-3-third reverse folding line, 2-4-fourth forward folding line, 2-5-fifth folding line, 2-51-fifth forward folding line, 2-52-fifth reverse folding line, 2-6-sixth forward folding line, 2-7-seventh reverse folding line, 2-8-eighth forward folding line, 2-9-ninth reverse folding line;

21-first region, 22-second region, 23-third region, 24-fourth region, 25-fifth region, 26-sixth region, 27-seventh region, 28-eighth region, 29-ninth region, 30-tenth region;

3-vertical structure, 3-1-first vertical assembly, 3-11-first member, 3-12-second member, 3-13-third member, 3-14-fourth member, 3-15-fifth member;

3-2-second vertical assembly, 3-21-sixth member, 3-22-seventh member, 3-23-eighth member, 3-24-ninth member, 3-25-tenth member;

3-3-middle connecting piece, 33-1-part I, 33-11-arc connecting piece;

4-a first connecting piece, 5-a second connecting piece, 6-a first folding section, 7-a second folding section, 8-a first bonding section, and 9-a second bonding section;

10-double-layer structure, 10-1-first layer page, 10-2-second layer page and 10-3-connecting segment.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same, are intended to fall within the scope of the present disclosure.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1-3, which illustrate an embodiment of the present invention; the invention discloses a display type three-dimensional book with a large spread three-dimensional scene, which comprises a bottom plate 1 and a folding body,

the bottom plate 1 can be folded along the central line thereof;

the folding body is bonded on the bottom plate 1 and can be folded along the central line of the bottom plate 1, the folding body comprises a multilayer folding structure 2 and a vertical structure 3, a V-shaped knife edge 1-1 is arranged on the bottom plate 1, two side edges of the multilayer folding structure 2 are connected with the V-shaped knife edge 1-1, and the bottom edge of the vertical structure 3 is bonded on two sides of the bottom plate 1 along the central line thereof;

the multilayer folded structure 2 is folded forward and backward in sequence along a direction parallel to the axis of symmetry with the center line thereof as the axis of symmetry. The multilayer folding structure 2 is a V-shaped structure which is a whole three-dimensional stressed structure, and the opening and closing of the part drives all other parts to move. The key point of the optimal angle of the whole structure is that the multi-layer folding structure 2 ensures the integrity of the paper of the structure as much as possible, the angle is more than 20 degrees of the sticking position angle, the tension of the paper is released to the maximum, and other components can be attached to the structure and can be opened and closed by virtue of the force.

Specifically, the multilayer folding structure 2 is divided into a first region 21, a second region 22, a third region 23, a fourth region 24, a fifth region 25, a sixth region 26, a seventh region 27, an eighth region 28, a ninth region 29 and a tenth region 30 by a first reverse folding line 2-1, a second forward folding line 2-2, a third reverse folding line 2-3, a fourth forward folding line 2-4, a fifth folding line 2-5, a sixth forward folding line 2-6, a seventh reverse folding line 2-7, an eighth forward folding line 2-8 and a ninth reverse folding line 2-9;

the connecting line of the centers of the first area 21 and the second area 22 and the connecting line of the centers of the ninth area 29 and the tenth area 30 respectively form an included angle of 45 degrees with the extension line of the top edge of the multi-layer folded structure 2. The fifth members 3-15 are pulled to make the left and right opening and closing structure pull up the front and back opening and closing structure by utilizing the vertical rotation characteristic of 45 degrees.

In particular, the fifth fold line 2-5 comprises a fifth positive fold line 2-51 and a fifth reverse fold line 2-52, the extension of the fifth positive fold line 2-51 coinciding with the extension of the fifth reverse fold line 2-52 when the multi-ply folded structure 2 is fully unfolded, wherein the fifth positive fold line 2-51 is adjacent to the bottom panel 1.

Specifically, the fourth positive fold line 2-4, the fifth reverse fold line 2-52, the fifth positive fold line 2-51, and the sixth positive fold line 2-6 are parallel to one another.

Specifically, a first region 21 defined by the first reverse folding line 2-1 and one side edge of the multi-ply folding structure 2 is equal in area to a tenth region 30 defined by the ninth reverse folding line 2-9 and the other side edge of the multi-ply folding structure 2, a second region 22 defined by the first reverse folding line 2-1 and the second forward folding line 2-2 is equal in area to a ninth region 29 defined by the eighth forward folding line 2-8 and the ninth reverse folding line 2-9, a third region 23 defined by the second forward folding line 2-2 and the third reverse folding line 2-3 is equal in area to an eighth region 28 defined by the seventh reverse folding line 2-7 and the eighth forward folding line 2-8, and a fourth region 24 defined by the third reverse folding line 2-3, the fourth forward folding line 2-4 and the fifth forward folding line 2-51 is equal in area to a seventh region 27 defined by the fifth forward folding line 2-51, the sixth forward folding line 2-6 and the seventh reverse folding line 2-7 The products are equal and the fifth area 25 divided by the fourth positive fold line 2-4 and the fifth reverse fold line 2-52 is equal in area to the sixth area 26 divided by the fifth reverse fold line 2-52 and the sixth positive fold line 2-6.

Specifically, the vertical structure 3 comprises a first vertical assembly 3-1 adhered to one side of the bottom plate 1 and a second vertical assembly 3-2 adhered to the other side of the bottom plate 1;

the first vertical assembly 3-1 comprises a first member 3-11, a second member 3-12, a third member 3-13, a fourth member 3-14 and a fifth member 3-15 which are connected through a first connecting piece 4, wherein the first member 3-11, the second member 3-12, the third member 3-13, the fourth member 3-14 and the fifth member 3-15 are parallel to each other, one end of the first connecting piece 4 is bonded with the first member 3-11, the other end of the first connecting piece is clamped on the fifth member 3-15, and one side of the fifth member 3-15 is clamped on the first area 21; the first connecting piece 4 pulls up or puts down the components in a linkage manner.

The second vertical module 3-2 comprises a sixth member 3-21, a seventh member 3-22, an eighth member 3-23, a ninth member 3-24 and a tenth member 3-25 which are connected through a second connecting piece 5, wherein the sixth member 3-21, the seventh member 3-22, the eighth member 3-23, the ninth member 3-24 and the tenth member 3-25 are parallel to each other, one end of the second connecting piece 5 is adhered with the sixth member 3-21, the other end is clamped on the tenth member 3-25, and one side of the tenth member 3-25 is clamped on the tenth area 30. The second connecting piece 5 is used for pulling up or putting down the components in a linkage manner.

Specifically, the vertical structure 3 further comprises an intermediate connecting piece 3-3 for connecting a first member 3-11 and a sixth member 3-21, the intermediate connecting piece 3-3 comprises a first part 33-1, a first folding section 6 and a second folding section 7 are respectively arranged on two sides of the first part 33-1, the first folding section 6 is connected with the first member 3-11, the second folding section 7 is connected with the sixth member 3-21, and a first bonding section 8 and a second bonding section 9 which are bonded with the bottom plate 1 are respectively arranged on the bottom edge of the first part 33-1;

the first part 33-1 can be folded along the central line thereof along with the folding of the bottom plate 1.

Specifically, the paper-type paper-making machine further comprises two arc-shaped connecting pieces 33-11 which are arranged on the first part 33-1 along two sides of the central line of the first part in a staggered mode, the two arc-shaped connecting pieces 33-11 are formed by arc-shaped knife edges arranged on the first part 33-1, and paper types are respectively bonded on the two arc-shaped connecting pieces 33-11. After the bottom plate 1 is opened, the first part 33-1 is erected, the arc-shaped connecting piece 33-11 is bounced, and after the bottom plate 1 is folded, the two arc-shaped connecting pieces 33-11 are overlapped together.

Specifically, the first part 33-1, the first folding section 6, the first member 3-11, the second folding section 7, the sixth member 3-21, the first adhesive section 8 and the second adhesive section 9 are integrally formed.

Specifically, the top of each of the fifth member 3-15 and the tenth member 3-25 is provided with a double-layer structure 10, the double-layer structure 10 comprises a first layer page 10-1 and a second layer page 10-2, the first layer page 10-1 is respectively bonded with the fifth member 3-15 through two connecting sections 10-3 or bonded with the tenth member 3-25 through two connecting sections 10-3, the second layer page 10-2 is positioned between the first layer page 10-1 and the fifth member 3-15 or between the first layer page 10-1 and the tenth member 3-25, and the second layer page 10-2 is bonded on the connecting section 10-3. The double-layer structure 10 forms a three-layer structure with the fifth members 3-15 and the tenth members 3-25, respectively, to increase the layering.

The working principle is as follows:

the multi-ply folding structure 2 is partially unfolded backwards in the process of opening the bottom plate 1, the first area 21 and the second area 22 and the seventh area 27 and the eighth area 28 respectively draw the front fifth member 3-15 and the tenth member 3-25, and the first member 3-11, the second member 3-12, the third member 3-13, the fourth member 3-14, the fifth member 3-15, the sixth member 3-21, the seventh member 3-22, the eighth member 3-23, the ninth member 3-24 and the tenth member 3-25 are drawn up by the linkage of the first connecting piece 4 and the second connecting piece 5, such that the vertical structure 3 can stand straight forwards and go backwards, the visual close relation of the picture is more complicated, the opening and closing are smooth, the bouncing speed is high, the structure of the v-shaped angle at the bottom of the multi-ply folding structure 2 is stable and firm with tension, and is not easy to be damaged.

In summary, by the design of the multi-layer folding structure, when the three-dimensional paper art is folded, the backward-expanded part is smoothly and independently retracted into the page.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.

Claims (10)

1. A spread large three-dimensional scene display type three-dimensional book comprises a bottom plate (1) and a folding body,

the bottom plate (1) can be folded along the center line thereof;

the folding body is bonded on the bottom plate (1) and can be folded along the central line of the bottom plate (1), the folding body comprises a multilayer folding structure (2) and a vertical structure (3), a V-shaped knife edge (1-1) is arranged on the bottom plate (1), two side edges of the multilayer folding structure (2) are connected with the V-shaped knife edge (1-1), and the bottom edge of the vertical structure (3) is bonded on two sides of the bottom plate (1) along the central line;

the multilayer folding structure (2) is sequentially folded forwards and backwards by taking the central line as a symmetry axis.

2. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 1, wherein: the multilayer folding structure (2) is divided into a first area (21), a second area (22), a third area (23), a fourth area (24), a fifth area (25), a sixth area (26), a seventh area (27), an eighth area (28), a ninth area (29) and a tenth area (30) by a first reverse folding line (2-1), a second forward folding line (2-2), a third reverse folding line (2-3), a fourth forward folding line (2-4), a fifth folding line (2-5), a sixth forward folding line (2-6), a seventh reverse folding line (2-7), an eighth forward folding line (2-8) and a ninth reverse folding line (2-9);

the connecting line of the centers of the first area (21) and the second area (22) and the connecting line of the centers of the ninth area (29) and the tenth area (30) respectively form an included angle of 45 degrees with the extension line of the top edge of the multi-layer folding structure (2).

3. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 2, wherein: the fifth folding line (2-5) comprises a fifth positive folding line (2-51) and a fifth reverse folding line (2-52), when the multi-layer folding structure (2) is completely unfolded, the extension line of the fifth positive folding line (2-51) is coincident with the extension line of the fifth reverse folding line (2-52), wherein the fifth positive folding line (2-51) is close to the bottom plate (1).

4. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 3, wherein: the fourth positive folding line (2-4), the fifth reverse folding line (2-52), the fifth positive folding line (2-51) and the sixth positive folding line (2-6) are parallel to each other.

5. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 4, wherein: a first region (21) divided by the first reverse folding line (2-1) and one side edge of the multi-layer folding structure (2) is equal in area to a tenth region (30) divided by the ninth reverse folding line (2-9) and the other side edge of the multi-layer folding structure (2), a second region (22) divided by the first reverse folding line (2-1) and the second forward folding line (2-2) is equal in area to a ninth region (29) divided by the eighth forward folding line (2-8) and the ninth reverse folding line (2-9), a third region (23) divided by the second forward folding line (2-2) and the third reverse folding line (2-3) is equal in area to an eighth region (28) divided by the seventh reverse folding line (2-7) and the eighth forward folding line (2-8), and a fourth region (24) divided by the third reverse folding line (2-3), the fourth forward folding line (2-4) and the fifth forward folding line (2-51) is equal in area to a fifth region The areas of the seventh regions (27) divided by the positive folding lines (2-51), the sixth positive folding lines (2-6) and the seventh reverse folding lines (2-7) are equal, and the areas of the fifth regions (25) divided by the fourth positive folding lines (2-4) and the fifth reverse folding lines (2-52) and the areas of the sixth regions (26) divided by the fifth reverse folding lines (2-52) and the sixth positive folding lines (2-6) are equal.

6. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 5, wherein: the vertical structure (3) comprises a first vertical component (3-1) adhered to one side of the bottom plate (1) and a second vertical component (3-2) adhered to the other side of the bottom plate (1);

the first vertical assembly (3-1) comprises a first member (3-11), a second member (3-12), a third member (3-13), a fourth member (3-14) and a fifth member (3-15) which are connected through a first connecting piece (4), wherein the first member (3-11), the second member (3-12), the third member (3-13), the fourth member (3-14) and the fifth member (3-15) are parallel to each other, one end of the first connecting piece (4) is bonded with the first member (3-11), the other end of the first connecting piece is clamped on the fifth member (3-15), and one side of the fifth member (3-15) is clamped on the first area (21);

the second vertical assembly (3-2) comprises a sixth member (3-21), a seventh member (3-22), an eighth member (3-23), a ninth member (3-24) and a tenth member (3-25) which are connected through a second connecting piece (5), wherein the sixth member (3-21), the seventh member (3-22), the eighth member (3-23), the ninth member (3-24) and the tenth member (3-25) are parallel to each other, one end of the second connecting piece (5) is bonded with the sixth member (3-21) and the other end thereof is clamped on the tenth member (3-25), and one side of the tenth member (3-25) is clamped on a tenth area (30).

7. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 6, wherein: the vertical structure (3) further comprises an intermediate connecting piece (3-3) connected with a first member (3-11) and a sixth member (3-21), the intermediate connecting piece (3-3) comprises a first part (33-1), a first folding section (6) and a second folding section (7) are respectively arranged on two sides of the first part (33-1), the first folding section (6) is connected with the first member (3-11), the second folding section (7) is connected with the sixth member (3-21), and a first bonding section (8) and a second bonding section (9) bonded with the bottom plate (1) are respectively arranged on the bottom edge of the first part (33-1);

the first part (33-1) can be folded along the central line thereof along with the folding of the bottom plate (1).

8. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 7, wherein: the paper-type connecting piece is characterized by further comprising two arc-shaped connecting pieces (33-11) which are arranged on the first part (33-1) along two sides of the central line of the first part in a staggered mode, the arc-shaped connecting pieces (33-11) are formed by arc-shaped knife edges formed in the first part (33-1), and paper types are respectively bonded on the two arc-shaped connecting pieces (33-11).

9. The spread large stereoscopic scene exhibition type stereoscopic book according to claim 7, wherein: the first part (33-1), the first folding section (6), the first member (3-11), the second folding section (7), the sixth member (3-21), the first bonding section (8) and the second bonding section (9) are integrally formed.

10. The spread stereoscopic scene exhibition stereoscopic book according to claim 6 or 9, wherein: the top of each of the fifth component (3-15) and the tenth component (3-25) is provided with a double-layer structure (10), each double-layer structure (10) comprises a first layer page (10-1) and a second layer page (10-2), each first layer page (10-1) is bonded with the fifth component (3-15) through two connecting sections (10-3) or bonded with the tenth component (3-25) through two connecting sections (10-3), each second layer page (10-2) is located between the first layer page (10-1) and the fifth component (3-15) or between the first layer page (10-1) and the tenth component (3-25), and each second layer page (10-2) is bonded on each connecting section (10-3).

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