CN104501038B - Backlight module component - Google Patents

Abstract

The invention provides a backlight module assembly, which includes a backlight module, a protective film and a release film. The backlight module has a light-emitting surface and a bottom surface opposite to each other. The protective film has a base material and an adhesive layer stacked on each other, and the base material is located between the bottom surface and the adhesive layer, and the shape of the protective film is T-shaped. The release film is attached to the part of the adhesive layer, so that part of the adhesive layer is exposed outside the release film, and the exposed adhesive layer surrounds the periphery of the backlight module, wherein the shape of the exposed adhesive layer is an open loop , and the endpoints of the open loop are stepped contours.

Description

Backlight Module Assembly

technical field

The invention relates to a backlight module assembly.

Background technique

The backlight module is one of the key components of the liquid crystal display. Its function is to supply sufficient brightness and evenly distributed light sources so that the liquid crystal display can display images normally.

Generally speaking, the backlight module has a light-emitting surface and a bottom surface opposite to the light-emitting surface, and the bottom surface can be used to match with other workpieces such as a system case or a touch panel. Before the backlight module is attached to other workpieces, the industry usually covers the bottom surface with a protective film to prevent dust and protect the backlight module.

During the assembly process, when the backlight module needs to be attached to other workpieces, the installer will tear off the part of the release film on the protective film, thereby exposing the part of the protective film that can be attached to the workpiece. However, traditionally, after part of the release film is torn off, the remaining release film will not be integrated, so especially the release film with a small area is easy to fall off in the next process, or even stick to other positions of the backlight module, greatly affecting the assembly efficiency of the liquid crystal display.

Contents of the invention

A technical aspect of the present invention is to provide a backlight module assembly, the protective film and the release film on the bottom side of the backlight module are all integrally cut and formed, so that the integrity of the protective film and the release film can be increased .

According to an embodiment of the present invention, a backlight module assembly includes a backlight module, a protective film and a release film. The backlight module has a light-emitting surface and a bottom surface opposite to each other. The protective film has a base material and an adhesive layer stacked on each other, and the base material is located between the bottom surface and the adhesive layer, and the shape of the protective film is T-shaped. The release film is attached to the part of the adhesive layer, so that part of the adhesive layer is exposed outside the release film, and the exposed adhesive layer surrounds the periphery of the backlight module, wherein the shape of the exposed adhesive layer is an open loop , and the endpoints of the open loop are stepped contours.

In one or more embodiments of the present invention, the above-mentioned backlight module includes a protruding structure. The base material includes a first body part and a first tear part. The first main body covers the bottom surface. The first tearing portion is connected to the first main body, and the first tearing portion covers the protruding structure.

In one or more embodiments of the present invention, the above-mentioned adhesive layer includes a second main body portion and a second tearing handle portion. The second body part covers the first body part. The second tearing portion is connected to the second main body, and the second tearing portion covers the first tearing portion.

In one or more embodiments of the present invention, the above release film includes a third main body part, a third tear part and a connecting part. The third body part covers part of the second body part. The third tearing part covers part of the second tearing part. The connecting portion connects the third main body portion and the third tearing portion along a longitudinal direction.

In one or more embodiments of the present invention, the above-mentioned connecting portion includes a first connecting sub-portion and a second connecting sub-portion. The first connecting sub-portion is connected to the third tearing hand portion, and the first connecting sub-portion has a first width along a transverse direction across the longitudinal direction. The second connecting sub-portion connects the first connecting sub-portion and the third main body portion, and the second connecting sub-portion has a second width along the lateral direction, and the first width is greater than the second width.

In one or more embodiments of the present invention, the above-mentioned adhesive layer exposed outside the release film includes an adhesive surrounding area and an adhesive inner extending area. The adhesive surrounding area surrounds at least part of the third main body, the inner edge of the adhesive surrounding area adjoins the third main body, the outer edge of the adhesive surrounding area relative to the inner edge is a peripheral edge, the outer edge of the adhesive surrounding area and the inner edge Between defines the third width. The adhesive inward extension area is connected to one end of the adhesive surrounding area, and the adhesive inner extension area can extend to between the third main body part and the first connecting subpart, wherein the third main body part and the first connecting subpart The viscose inward extension region has a fourth width in the longitudinal direction, the fourth width being smaller than the third width.

In one or more embodiments of the present invention, there is at least one chamfer between the above-mentioned first connecting subsection and the third tearing section.

Another technical aspect of the present invention is to provide a protective film combination, the protective film and the release film are integrally cut and formed, so that the integrity of the protective film and the release film can be increased.

According to another embodiment of the present invention, a protective film assembly includes a protective film, a release film, and a tear-off portion. The protective film has a base material and an adhesive layer laminated with each other. The release film is attached to part of the adhesive layer, and the release film sequentially connects the third body part, the second connection part, the first connection part and the third tearing part along the longitudinal direction. The tear-off part is attached to part of the adhesive layer and at least partly surrounds the release film. The second connecting sub-portion has a first width in the lateral direction, and the first connecting sub-portion has a second width in the lateral direction, and the first width is larger than the second width, and the lateral direction is substantially perpendicular to the longitudinal direction.

In one or more embodiments of the present invention, the above-mentioned release film and the tear-off part are arranged on the same horizontal plane, and the release film and the tear-off part can be completely separated or partially separated.

In one or more embodiments of the present invention, there is at least one chamfer between the above-mentioned first connecting subsection and the third tearing section.

Compared with the known prior art, the above-mentioned embodiment of the present invention has at least the following advantages:

(1) Since the base material of the protective film is integrally cut and formed, and the first tearing part of the base material is connected to the first main body part, the structural integrity of the base material (that is, the protective film) is increased .

(2) Since the release film can also be cut and formed in one piece, the structural integrity of the release film can also be increased.

(3) Since there is at least one chamfer between the first connecting subpart and the third tearing part, which is located at the corner where the first connecting part connects with the third tearing part, therefore, the stress is concentrated on the corner and The chance of film damage is reduced.

Description of drawings

FIG. 1 shows a perspective view of a backlight module assembly according to an embodiment of the present invention;

Fig. 2 shows a perspective view of a protective film assembly according to an embodiment of the present invention.

reference sign

100: Backlight module assembly 100A: Protective film assembly

110: Backlight module 111: Light-emitting surface

112: bottom surface 113: protruding structure

120: Protective film 121: Substrate

121a: first main body part 121b: first tearing hand part

122: adhesive layer 122a: second body part

122b: Second tearing hand part 123: Adhesive surrounding area

124: Viscose inner extension area 130: Release film

130a: third body part 130b: third tearing hand part

131: connecting part 131a: first connecting subpart

131b: Second connecting subsection 150: Tear-off section

150a: fit around subsection 150b: fit inside subsection

151: handle D1: first width

D2: second width D3: third width

D4: fourth width D5: fifth width

D6: sixth width L: longitudinal direction

R: Lead angle T: Transverse direction

detailed description

A plurality of embodiments of the present invention will be disclosed with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some conventional structures and elements will be shown in a simple and schematic way in the drawings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have their usual meanings that can be understood by those skilled in the art. Furthermore, the definitions of the above-mentioned words in commonly used dictionaries shall be interpreted as meanings consistent with the relevant fields of the present invention in the content of this specification. Unless specifically defined, these terms are not to be interpreted in an idealized or overly formal sense.

Please refer to FIG. 1 , which is a perspective view illustrating a backlight module assembly 100 according to an embodiment of the present invention. As shown in FIG. 1 , a backlight module assembly 100 includes a backlight module 110 , a protective film 120 and a release film 130 . The backlight module 110 has a light emitting surface 111 and a bottom surface 112 opposite to each other. The protection film 120 has a base material 121 and an adhesive layer 122 stacked on each other, and the base material 121 is located between the bottom surface 112 and the adhesive layer 122 , and the shape of the protection film 120 is T-shaped. The release film 130 is attached to the part of the adhesive layer 122, so that part of the adhesive layer 122 is exposed outside the release film 130, and the exposed adhesive layer 122 surrounds the periphery of the backlight module 110, wherein the exposed adhesive layer The shape of 122 is an open loop, and the endpoint of the open loop is a stepped profile. In other words, the shape of the exposed adhesive layer 122 is not a closed loop such as a square or a circle, but has two ends. There is a release film 130 between two ends of the exposed adhesive layer 122 , so that the exposed adhesive layer 122 forms an open loop. In this embodiment, the protective film 120 can be fixed on the backlight module 110 through the adhesive layer of the substrate 121 facing the bottom surface 112 , but the invention is not limited thereto.

Since the adhesive layer 122 has a sticking function, the exposed adhesive layer 122 can provide an adhesive force, so that the bottom surface 112 of the backlight module 110 can be combined with other workpieces (not shown) through the protective film 120 . Specifically, the other workpiece can be a system housing or other electronic components such as a touch panel. In this embodiment, the exposed adhesive layer 122 surrounds the periphery of the backlight module 110, that is to say, the adhesion between the backlight module 110 and other workpieces is limited to the periphery of the backlight module 110, so that the adhesive layer 122 will not be affected by Excessive exposure results in an excessively large bonding area, so that the bonding force will not be too strong and affect the assembly of the backlight module 110 and other workpieces. In other words, the central portion of the adhesive layer 122 is adhered to the release film 130 and protected by the release film 130 without being exposed to the outside.

In practical applications, the substrate 121 can be a transparent high-temperature resistant polyethylene terephthalate (poly(ethylene terephthalate); PET) film, and since the PET film has a weak adhesive layer, the PET film can be attached to The bottom surface 112 of the backlight module 110 . In addition, the thickness of the substrate 121 is about 0.05 mm, but the invention is not limited thereto.

As shown in FIG. 1 , the backlight module 110 includes a protruding structure 113 . Specifically, the protruding structure 113 can be a protruding portion of a metal frame (not shown) of the backlight module 110 , but the present invention is not limited thereto. The protruding structure 113 can also be a circuit board, which is used to communicate the electrical signal of the backlight module 110 with other components. In addition, the base material 121 of the protective film 120 includes a first body portion 121 a and a first tear portion 121 b, and the first body portion 121 a covers the bottom surface 112 of the backlight module 110 . In this embodiment, the first tearing portion 121b is connected to the first body portion 121a to form a T shape, and the first tearing portion 121b covers the protruding structure 113 . In other words, the shape of the protective film 120 is corresponding to the backlight module 110, and the surface area of the protective film 120 is the same as that of the backlight module 110, that is, the edges of the protective film 120 and the edges of the backlight module 110 are aligned with each other, so that the bottom surface of the backlight module 110 can be It is completely covered by the protective film 120 . In a practical application, the base material 121 is cut into one piece to increase the structural integrity of the base material 121 (ie, the protective film 120 ).

On the other hand, the adhesive layer 122 of the protective film 120 includes a second body portion 122 a and a second tear portion 122 b, and the second body portion 122 a covers the first body portion 121 a of the substrate 121 . The second tearing portion 122b is connected to the second body portion 122a, and the second tearing portion 122b covers the first tearing portion 121b of the base material 121 . Since the adhesive layer 122 has a sticking function, the adhesive layer 122 can be firmly bonded to the substrate 121 . In practical application, the adhesive layer 122 can be acrylic adhesive. In addition, the thickness of the adhesive layer 122 is about 0.015 mm, but the invention is not limited thereto.

Moreover, the release film 130 includes a third main body portion 130 a , a third tearing portion 130 b and a connecting portion 131 . The third body part 130a covers part of the second body part 122a, so that part of the adhesive layer 122 is exposed outside the third body part 130a. The third tearing portion 130b covers part of the second tearing portion 122b. The connecting portion 131 connects the third body portion 130a and the third tearing portion 130b along the longitudinal direction L. As shown in FIG. In other words, in practical applications, the release film 130 can be cut into one piece to increase the structural integrity of the release film 130 . In addition, the thickness of the release film 130 is about 0.025 mm, but the invention is not limited thereto.

More specifically, the connecting portion 131 includes a first connecting sub-portion 131 a and a second connecting sub-portion 131 b. As mentioned above, the connecting portion 131 connects the third body portion 130a and the third tearing hand portion 130b along the longitudinal direction L. As shown in FIG. Specifically, in this embodiment, the longitudinal direction L is the direction in which the protruding structure 113 extends outward from one side of the backlight module 110, that is, the protruding structure 113 extends from one side of the backlight module 110 to the longitudinal direction L. The third main body portion 130a, the first connecting sub-portion 131a, the second connecting sub-portion 131b and the third tearing hand portion 130b are arranged in sequence along the longitudinal direction L and connected to each other. Referring to FIG. 1 , the first connecting sub-portion 131 a is connected to the third tearing hand portion 130 b, and the first connecting sub-portion 131 a has a first width D1 along a transverse direction T across the longitudinal direction L. Referring to FIG. In this embodiment, when the backlight module 110 is rectangular (shape not including the protruding structure), the transverse direction T is perpendicular to the longitudinal direction L. As shown in FIG. However, depending on the shape design of the backlight module 110, the angle relationship between the transverse direction T and the longitudinal direction L may not be orthogonal. , the transverse direction T and the longitudinal direction L are respectively parallel to two adjacent sides of the parallelogram.

Moreover, the second connecting sub-portion 131b connects the first connecting sub-portion 131a and the third main body portion 130a, and the second connecting sub-portion 131b has a second width D2 along the transverse direction T across the longitudinal direction L. As shown in FIG. As shown in FIG. 1 , the first width D1 is greater than the second width D2 , so that the profile of the exposed adhesive layer 122 adjacent to the connecting portion 131 is stepped. Also because the first width D1 is greater than the second width D2, the area of the first connecting sub-portion 131a attached to the adhesive layer 122 is greater than the area of the second connecting sub-portion 131b attached to the adhesive layer 122, therefore, the first connecting sub-portion The adhesive force between the 131a and the adhesive layer 122 is also stronger than the adhesive force between the second connecting sub-portion 131b and the adhesive layer 122 . In this way, when the third tearing part 130b is separated from the adhesive layer 122 of the protective film 120 due to an accident, since the first connecting sub-part 131a and the adhesive layer 122 have a stronger adhesive force, the first connection The chance of the sub-part 131a detaching from the adhesive layer 122 along with the third tearing part 130b will be effectively reduced, and the detachment of the third tearing part 130b from the adhesive layer 122 is thus limited and will not extend to the first connector part 131a, so that the second connecting sub-part 131b and the third main body part 130a will not be affected by the detachment of the third tearing part 130b from the adhesive layer 122. Conversely, assuming that the first width D1 is the same as the second width D2, and the width of the third tearing portion 130b along the transverse direction T is also similar to the first width D1 and the second width D2, when the third tearing portion 130b is due to When the adhesive layer 122 of the protective film 120 is accidentally separated, the first connector part 131a and the second connector part 131b will tend to be separated from the adhesive layer 122 successively as the third tearing part 130b is separated from the adhesive layer 122. Detachment, and further affect the sticking between the third main body part 130a and the adhesive layer 122 .

On the other hand, the adhesive layer 122 exposed outside the third main body portion 130a of the release film 130 includes an adhesive surrounding area 123 and an adhesive inner extension area 124, and the adhesive inner extension area 124 extends from the adhesive surrounding area 123 to The release film 130 is extended so that the adhesive inner extension region 124 can extend to between the third main body portion 130 a and the first connecting sub-portion 131 a. The adhesive surrounding area 123 surrounds at least part of the third body portion 130a, the inner edge of the adhesive surrounding area 123 is adjacent to the third main body portion 130a, the outer edge of the adhesive surrounding area 123 relative to the inner edge is a peripheral edge, and the adhesive surrounding area 123 A third width D3 is defined between the outer edge and the inner edge of . In other words, the distance from the inner edge of the adhesive surrounding region 123 on the same side of the protruding structure 113 to the outer edge along the longitudinal direction L is the third width D3. Specifically, the adhesive inner extension area 124 is connected to one end of the adhesive surrounding area 123, so that the adhesive inner extension area 124 is located between the third main body portion 130a and the first connecting sub-section 131a, wherein the third main body portion The adhesive inward extension region 124 between the 130a and the first connecting sub-portion 131a has a fourth width D4 in the longitudinal direction L, and the fourth width D4 is smaller than the third width D3. More specifically, the fourth width D4 is about 40% to 60% of the third width D3. In this way, the fourth width D4 will not reduce the sticking force of the adhesive inner extension surface 124 to other workpieces because it is too small. And the fourth width D4 will not make the first connecting sub-portion 131a too thin and easily broken because it is too large. Moreover, since the fourth width D4 is smaller than the third width D3, the contours of both ends of the exposed adhesive layer 122 are stepped.

In order to further prevent the first connection sub-portion 131a from being broken, and reduce the chance of the release film 130 being torn at the corner where the first connection sub-portion 131a is connected to the third tearing hand portion 130b, as shown in FIG. 1, the first connection There is at least one chamfer R between the sub-part 131a and the third tearing part 130b, which is located at the corner connecting the first connecting sub-part 131a and the third tearing part 130b, so as to reduce stress concentration on the release film 130 at the corner opportunity for destruction.

Please refer to FIG. 2 , which is a perspective view illustrating a protective film assembly 100A according to an embodiment of the present invention. As shown in FIG. 2 , a protective film assembly 100A includes a protective film 120 , a release film 130 and a tear-off portion 150 . The protection film 120 has a base material 121 and an adhesive layer 122 laminated on each other, and the shape of the protection film 120 is T-shaped. The release film 130 is attached to part of the adhesive layer 122, and the release film 130 sequentially connects the third main body portion 130a, the second connecting sub-portion 131b, the first connecting sub-portion 131a and the second connecting sub-portion along the longitudinal direction L. Three tearing hands 130b. The tear-off portion 150 is attached to a portion of the adhesive layer 122 and at least partially surrounds the release film 130 . The second connecting sub-portion 131b has a first width D1 in the lateral direction T, while the first connecting sub-portion 131a has a second width D2 in the lateral direction T, and the first width D1 is greater than the second width D2, and the lateral direction T is substantially orthogonal to the longitudinal direction L.

In other words, the tear-off portion 150 will be attached to the adhesive layer 122 before matching to other workpieces. When the protective film 120 needs to be matched to other workpieces, the user can tear off the tear-off part 150 from the protective film combination 100A by connecting the handle 151 on the edge of the tear-off part 150, so that the adhesive layer outside the release film 130 122 exposed to the outside world. In order to facilitate the user to identify the position of the handle 151, the handle 151 can be made of brightly colored plastic material, but the invention is not limited thereto.

More specifically, the tear-off portion 150 includes a fitting surrounding subsection 150a and a fitting inner subsection 150b. Fitting around the third body portion 130a of at least part of the release film 130 around the sub-part 150a, fitting around the inner edge of the sub-part 150a adjacent to the third body portion 130a, fitting around the outer edge of the opposite inner edge of the sub-part 150a as the periphery The edge fits around the outer edge and the inner edge of the sub-portion 150a to define a fifth width D5. The fitting inner subsection 150b is connected to one end of the fitting surrounding subsection 150a, so that the fitting inner subsection 150b is interposed between the third main body part 130a and the first connecting subsection 131a, wherein the third main body part 130a In the longitudinal direction L, the fitted and retracted sub-portion 150b between the first connecting sub-portion 131a has a sixth width D6. The sixth width D6 is smaller than the fifth width D5.

In this embodiment, the third width D3 is equal to the fifth width D5, and the fourth width D4 is equal to the sixth width D6. The closure part 150 a is attached to the adhesive surrounding surface 123 , so that the release film 130 and the tear-off part 150 completely cover the adhesive layer 122 of the protective film 120 . In this embodiment, the release film 130 and the tear-off portion 150 are disposed on the same level or have the same layer structure, and are made of the same material, and the release film 130 and the tear-off portion 150 can be completely separated or partially separated. More specifically, when the release film 130 is partially separated from the tear-off portion 150 , a bridging seam may be provided at the junction of the tear-off portion 150 and the release film 130 . When the tear-off portion 150 is to be torn off, the tear-off portion can be easily separated from the release film 130 by setting the seam. As for when the release film 130 is completely separated from the tear-off portion 150 , there may be a complete cutting line between the release film 130 and the tear-off portion 150 .

In summary, compared with the prior art, the technical solution of the present invention has obvious advantages and beneficial effects. Through the above technical solution, considerable technical progress can be achieved, and it has wide industrial application value. It has at least the following advantages:

(1) Since the base material of the protective film is integrally cut and formed, and the first tearing part of the base material is connected to the first main body part, the structural integrity of the base material (that is, the protective film) is increased .

(2) Since the release film can also be cut and formed in one piece, the structural integrity of the release film can also be increased.

(3) Since there is at least one chamfer between the first connecting subpart and the third tearing part, which is located at the corner where the first connecting part connects with the third tearing part, therefore, the stress is concentrated on the corner and The chance of film damage is reduced.

Although the present invention has been disclosed as above in terms of implementation, it is not intended to limit the present invention. Any person familiar with this technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined according to the appended claims.

Claims (10)

1. a kind of backlight module component is it is characterised in that comprise：

One backlight module, has a relative exiting surface and a bottom surface；

One protecting film, has the base material being layered on top of each other and an adhesive-layer, and described base material is located at described bottom surface and described viscose glue Layer between, and described protecting film be shaped as T-shaped；And

One mould release membrance, is attached at partly going up of described adhesive-layer, so that the described adhesive-layer of part is exposed to outside described mould release membrance, and Exposed described adhesive-layer around described backlight module periphery, one open follow by being shaped as of wherein exposed described adhesive-layer Ring, and the end points of described open cycle is stepped profile.

2. backlight module component according to claim 1 is it is characterised in that described backlight module comprises a projective structure, Described base material comprises：

One first main part, covers described bottom surface；And

One first tears hand, connects described first main part, and described first tears the hand described projective structure of covering.

3. backlight module component according to claim 2 is it is characterised in that described adhesive-layer comprises：

One second main part, covers described first main part；And

One second tears hand, connects described second main part, and described second tears hand and cover described first and tear hand.

4. backlight module component according to claim 3 is it is characterised in that described mould release membrance comprises：

One the 3rd main part, is covered in partly described second main part；

One the 3rd tears hand, is covered in and partly described second tears hand；And

One connecting portion, connects described 3rd main part and the described 3rd along a longitudinal direction and tears hand.

5. backlight module component according to claim 4 is it is characterised in that described connecting portion comprises：

One first connection sub-portion, connects the described 3rd and tears hand, and described first connects sub-portion along across described longitudinal direction One horizontal direction has one first width；And

One second connection sub-portion, connects described first and connects sub-portion and described 3rd main part, and described second connection sub-portion edge Described horizontal direction has one second width, and described first width is more than described second width.

6. backlight module component according to claim 5 is it is characterised in that be exposed to the described viscose glue outside described mould release membrance Layer comprises：

One viscose glue surrounding area, around at least part of described 3rd main part, an inner edge of described viscose glue surrounding area is adjacent described 3rd main part, an outer rim of the relatively described inner edge in described viscose glue surrounding area is peripheral edge, described viscose glue surrounding area described One the 3rd width is defined between outer rim and described inner edge；And

One viscose glue Nei Shen area, is connected to one end of described viscose glue surrounding area, and described viscose glue Nei Shen area may extend to the described 3rd Main part is connected between sub-portion with described first, is wherein connected the institute between sub-portion with described first positioned at described 3rd main part State viscose glue Nei Shen area, in described longitudinal direction, there is one the 4th width, described 4th width is less than described 3rd width.

7. backlight module component according to claim 5 is it is characterised in that described first connection sub-portion is torn with the described 3rd There is between hand at least one lead angle.

8. a kind of protecting film combines it is characterised in that comprising：

One protecting film, has the base material being layered on top of each other and an adhesive-layer；

One mould release membrance, is attached on the described adhesive-layer of part, and described mould release membrance comprises along on a longitudinal direction, by described One the 3rd main part that one end of adhesive-layer sequentially connects to the other end, one second connect sub-portion, one first connection sub-portion and 3rd tears hand；And

One removes portion, is attached on the described adhesive-layer of part, and at least partially surrounding described mould release membrance；

Wherein, described second connection sub-portion has one second width on a horizontal direction, and described first connects sub-portion in institute State and one first width is had on horizontal direction, and described first width is more than described second width, described horizontal direction is then substantially On be orthogonal to described longitudinal direction.

9. protecting film combination according to claim 8 is it is characterised in that described mould release membrance and the described portion of removing are arranged on together One horizontal plane, and described mould release membrance and described removing can be kept completely separate between portion or be partially separated.

10. protecting film combination according to claim 8 is it is characterised in that described first connection sub-portion is torn with the described 3rd There is between hand at least one lead angle.