CN210724936U

CN210724936U - Mobile device protective housing

Info

Publication number: CN210724936U
Application number: CN201921070430.5U
Authority: CN
Inventors: 杨杰; 沙振华
Original assignee: Beijing Apollo Ding Rong Solar Technology Co Ltd
Current assignee: Shanghai zuqiang Energy Co.,Ltd.
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-06-09
Anticipated expiration: 2029-07-09

Abstract

The utility model relates to a daily utensil technical field, concretely relates to mobile device protective housing. The mobile equipment protection shell comprises a body and a photovoltaic assembly, wherein the body is provided with a containing surface and an exposed surface, the containing surface and the exposed surface are oppositely arranged, and the containing surface is used for wrapping the outside of the mobile equipment; photovoltaic module set up in on the exposed surface, photovoltaic module has first crease and second crease, first crease with the second crease is crossing. The utility model provides a mobile device protective housing can cooperate the mobile device to use, and portable can produce the electric energy under the illumination condition to can carry the electric energy to the mobile device in, prevent that the user from under the condition that can not normally charge such as open air, can not acquire and send information because of mobile device electric quantity such as cell-phone is low, can facilitate for people's life.

Description

Mobile device protective housing

Technical Field

The utility model relates to a daily utensil technical field, concretely relates to mobile device protective housing.

Background

With the gradual advance of the intelligent era, devices such as smart phones and the like become indispensable parts in the work and life of people. However, because the battery capacity of the smart phone is limited, and because the current rechargeable battery is relatively heavy, not easy to carry and has a priority on electric quantity, the situation that the electric quantity of the smart phone is low or even the smart phone is powered off may occur during the outgoing process of people, so that people can acquire or receive information through the smart phone, and the life and safety of people are adversely affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses (one) the technical problem that solve is: at present, when people go out, the situation that information cannot be acquired and received due to low power off of a mobile phone easily occurs, and adverse effects are generated on life and safety of people.

(II) technical scheme

In order to achieve the above technical problem, the present invention provides a mobile device protection case, which includes a body, wherein the body has a containing surface and an exposed surface, the containing surface and the exposed surface are oppositely disposed, and the containing surface is used for wrapping the mobile device;

photovoltaic module, photovoltaic module set up in on the exposed surface, photovoltaic module has first crease and second crease, first crease with the second crease is crossing.

Optionally, the first fold and the second fold form an included angle α between them, 0 ° < α <90 °, or 90 ° < α <180 °.

Optionally, the first crease and the second crease are provided with a plurality of, and a plurality of the first creases are parallel to each other, and are located two arbitrary and a plurality of between the first creases the second creases are parallel to each other.

Optionally, the photovoltaic module is folded in a three-pump folding method.

Optionally, an output interface is arranged on the body, a connection position of the output interface and the photovoltaic module is located in the body, and the output interface is used for being electrically connected with the mobile device.

Optionally, the body has a charging avoidance opening, the charging avoidance opening is arranged opposite to a charging interface of the mobile device, the charging avoidance opening is provided with a sealing cover, and the sealing cover is movably connected with the body.

Optionally, an output plug is arranged on the body, an input end of the output plug is connected with the photovoltaic module, and the output plug is used for being in plug-in fit with a charging interface of the mobile device.

Optionally, the output plug is provided with an input interface, the input interface is arranged on the body, and the input interface is used for being connected with an input device.

Optionally, the utility model provides a mobile device protective housing still includes the portion of accomodating, the portion of accomodating with body swing joint, and be formed with the accommodation space between the two, photovoltaic module accomodate in the accommodation space.

Optionally, the accommodating part comprises a cover plate and a first magnetic part connected with the cover plate, the cover plate is rotatably connected with the body, a second magnetic part is arranged on the body, and the first magnetic part and the second magnetic part are attracted with each other.

(III) advantageous effects

The utility model provides a mobile device protection shell, which can be installed outside mobile devices such as mobile phones and comprises a photovoltaic module, so that when the mobile device is in a low-power state, the mobile device can generate electricity under the illumination condition by virtue of the photovoltaic module, transmit electric energy into the mobile device and charge the mobile device, and under the bright condition, the photovoltaic module can generate electric energy, thereby avoiding the mobile devices such as mobile phones and the like from being in a low-power state to a certain extent; meanwhile, the photovoltaic module is provided with the first crease and the second crease, so that the photovoltaic module can be configured in a folding mode, does not occupy larger space, and is convenient for a user to carry.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a mobile device protection shell according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a photovoltaic module in a mobile device protection shell according to an embodiment of the present invention;

fig. 3 is an expanded view of a photovoltaic module in a mobile device protection shell according to an embodiment of the present invention.

Reference numerals

1-body;

11-a charging avoidance opening;

12-a pressing structure;

13-a containing surface;

2-a photovoltaic module;

21-a first fold;

22-a second fold;

3-a storage section;

31-a cover plate;

32-first magnetic part.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

As shown in fig. 1, fig. 2 and fig. 3, the utility model provides a mobile device protective housing, it includes body 1 and photovoltaic module 2, body 1 has containing face 13 and exposed face (not shown in the figure), and containing face and exposed face set up relatively, and at the in-process that uses this mobile device protective housing, can install body 1 outside the mobile device, live mobile device parcel with the help of containing face 13, and this can make whole mobile device protective housing and mobile device form a whole, portable. The photovoltaic module 2 is connected with the body 1, the photovoltaic module 2 is arranged outside the body 1, and the photovoltaic module 2 is specifically connected to the exposed surface, so that the photovoltaic module 2 can be ensured to be capable of converting light energy into electric energy by absorbing the light energy in a working state; meanwhile, in the use process of the mobile device protection shell, the photovoltaic module 2 can be connected with the mobile device, so that electric energy generated by the photovoltaic module 2 is transmitted into the mobile device, the purpose of supplying power to the mobile device by means of the photovoltaic module 2 is achieved, and the situation that a user cannot acquire and receive information in an area which cannot be charged due to low electric quantity of mobile devices such as mobile phones is prevented. And, in order to reduce the space that whole mobile device protective housing, especially photovoltaic module 2 occupy, the utility model provides a photovoltaic module 2 has first crease 21 and second crease 22, and first crease 21 and second crease 22 are crossing, and then makes photovoltaic module 2 can fold the setting under the non-operating condition, and this can reduce the shared space of whole photovoltaic module 2. When the photovoltaic module 2 is in the folded state, it is also possible to prevent itself from being damaged to some extent.

The photovoltaic module 2 is substantially rectangular, having long sides and short sides. In one embodiment, the photovoltaic module 2 includes a flexible substrate X and a plurality of solar cell chips Y. The plurality of solar cell chips Y are tiled and connected on the flexible substrate X regularly, and a preset interval is reserved between the adjacent solar cell chips Y. The flexible substrate is foldable, on the one hand, it can play a role of supporting and fixing the solar cell chip Y, and on the other hand, after the photovoltaic module 2 is completed, the whole photovoltaic module 2 can be folded by folding the flexible substrate X, and in this state, the first fold 21 and the second fold 22 are formed on the flexible substrate X.

In another embodiment, the photovoltaic module 2 may be a solar power generation paper, which may be foldable and capable of generating power by itself, and fig. 3 shows an unfolded state diagram of the photovoltaic module 2 under an operating condition. The photovoltaic module 2 has a first fold 21 and a second fold 22, and the first fold 21 and the second fold 22 intersect with each other, so that the photovoltaic module 2 has a foldable function.

Specifically, the body 1 may be formed of any one of materials such as PC (Polycarbonate), leather, silicone, cloth, rigid plastic, flexible plastic, metal, or tempered glass, and of course, the body 1 may be formed of several of the above materials; alternatively, the body 1 may be formed of other materials, which are not particularly limited herein; the shape of the body 1 can be correspondingly designed according to an application scene, and the shape and the size of the body 1 can be correspondingly designed according to different types of mobile equipment, and the body can be specifically divided into a tablet personal computer type, a mobile phone type, other electronic equipment and the like; meanwhile, the mobile phone can be further divided according to different models or specifications in the same type of product, such as a 4.7-inch mobile phone, a 5.5-inch mobile phone and the like, and the text is not described in detail in consideration of conciseness; in addition, the connection structure between the main body 1 and the mobile device may be various, as shown in fig. 1, the main body 1 may be a full-package protective shell, and the main body 1 with such a structure may be provided with a pressing structure 12 corresponding to a volume key, a power-on key, or other keys, so that a user can control the corresponding key by pressing the pressing structure 12; or, the body 1 can also adopt a half-pack structure, and after the body 1 with the structure is sleeved on the mobile equipment, keys such as a volume key, a start key and the like on the mobile equipment are exposed, so that a corresponding structure does not need to be arranged for the keys; certainly, in some cases, the body 1 and the mobile device may be connected into a whole by other methods such as magnetic attraction or adhesion, and those skilled in the art may select the connection according to actual situations, which will not be described in detail herein.

The photovoltaic module 2 can be made of CIGS (copper indium gallium selenide), silicon-based thin films or CdTe (cadmium telluride) and other materials; moreover, an output plug can be provided for the photovoltaic module 2, the input end of the output plug is connected with the photovoltaic module 2, and the output plug can be plugged into a charging port of the mobile device under the condition that the mobile device needs to be charged, so that the electric energy generated by the photovoltaic module 2 under the illumination condition can be transmitted into the mobile device; more specifically, the photovoltaic module 2 may be provided with a DC-DC integrated chip inside, so as to process the electric energy generated by the photovoltaic module 2 by means of the chip, and then transmit the electric energy to the mobile device, which may improve the protection effect on the battery in the mobile device. Of course, the photovoltaic module 2 can also transmit the generated electrical energy into the mobile device by means of other connecting lines. In addition, the thickness of the photovoltaic module 2 can be determined according to actual requirements, and preferably, the thickness of the photovoltaic module 2 can be made as thin as possible under the condition that the photovoltaic module has a good power generation function, so that the whole mobile device protection shell is further convenient to carry and use; simultaneously, photovoltaic module 2's length and width can be selected according to the concrete size correspondence of body 1 to carry out folding operation to photovoltaic module 2 through the settlement mode, so that the space of the shared utensil of whole photovoltaic module 2 is less relatively, portable.

The first fold 21 and the second fold 22 can each be provided with one, as shown in fig. 3, at an angle of α, optionally 0 ° < α <90 °, or 90 ° < α <180 °, preferably, the first fold 21 and the second fold 22 can each be provided with a plurality of folds, in which case the area of the whole photovoltaic module 2 in the unfolded state is relatively large, and the space occupied by the folded state is not increased too much, and the yield of the photovoltaic module 2 in this structural form is relatively large.

Specifically, the number of the first fold 21 and the second fold 22 may be determined according to actual requirements, for example, two, three or more may be provided for each; meanwhile, the arrangement direction of the first creases 21 may be the transverse direction of the body 1, or the longitudinal direction of the body 1, and accordingly, the arrangement direction of the second creases 22 may be determined according to the arrangement direction of the first creases 21. In addition, the intervals between the plurality of first creases 21 may be the same or different; alternatively, the intervals between the plurality of first creases 21 may be the same, in which case, the total area of the entire photovoltaic module 2 when unfolded is relatively large, which may improve the power generation efficiency of the photovoltaic module 2; accordingly, the intervals between the plurality of second creases 22 may also be made the same. Further, as shown in fig. 3, in the case where the plurality of first creases 21 are parallel to each other, a plurality of second creases located between any two first creases 21 may be made parallel to each other. Thus, during the process of folding the photovoltaic module 2, a plurality of first creases 21 may be formed first, and then a plurality of second creases 22 may be formed, each second crease 22 being inclined with respect to the first creases 21.

Preferably, as shown in fig. 2, the photovoltaic module 2 in the protective case of the mobile device provided by the present invention can be folded by a three-pump folding method, and the photovoltaic module 2 is folded by this method, so that when the photovoltaic module 2 needs to be opened, a user only needs to stretch along the axial direction of the photovoltaic module 2, and the whole structure can be unfolded conveniently and quickly; correspondingly, when folding photovoltaic module 2 is drawn in to needs, also only need with photovoltaic module 2 to with aforementioned tensile opposite direction one push away can, this greatly reduced whole photovoltaic module 2 the degree of difficulty that opens and shuts, promote user experience. Specifically, in the process of designing and producing the photovoltaic module 2, the folding ratio of the photovoltaic module 2 may be determined according to actual requirements, and optionally, the folding ratio may be 25: 1, and may also be 81: 1.

Further, an output interface (not shown) may be disposed on the body 1 to transmit the electric energy generated by the photovoltaic module 2 to the mobile device through the output interface. For example, the charging port and the output interface of the mobile device may be connected together by a transmission medium such as a data line, so as to achieve the purpose that the photovoltaic module 2 charges the mobile device. In addition, in the assembling process of the mobile device protection shell, the photovoltaic module 2 and the output interface need to be connected together, and preferably, the connection part of the photovoltaic module 2 and the output interface can be arranged inside the body 1, so that on one hand, the protection effect on the connection part of the photovoltaic module and the output interface can be improved, the connection part is prevented from being damaged due to an exposed state, and a user can be prevented from being injured due to touching the connection part; on the other hand, through building in photovoltaic module 2 and the junction of output interface, and add output interface, can also prevent because of frequently expandeing with folding photovoltaic module 2, and increase the damage probability of devices such as connecting wires between photovoltaic module 2 and the mobile device to promote the life of whole mobile device protective housing.

Specifically, the output interface may be disposed at a position such as a top, a side, or a bottom of the body 1, considering that a charging hole and an audio input-output hole of the mobile device are generally disposed at the bottom of the mobile device; optionally, the output interface may be disposed at the top of the body 1, and since the mobile device is generally of an approximately rectangular parallelepiped structure, the length of the top is generally smaller than that of the side portion, so that by disposing the output interface at the top of the body 1, the size of the side of the body 1 may be relatively smaller, which may also reduce the overall size of the mobile device protection case to some extent, thereby making the mobile device protection case easier to carry. The output interface can be a USB (Universal Serial Bus) interface, and the output interface with such a structure has high adaptability and is convenient to use. Of course, the output interface may have other types of structures, and the output interface and the charging port of the mobile device may be connected by other types of cables or devices, which will not be described in detail herein.

Optionally, the body 1 may be provided with a charging avoidance opening 11, and after the mobile device protection shell is mounted on the mobile device, the charging avoidance opening 11 is arranged opposite to a charging port of the mobile device, so as to avoid the charging port of the mobile device and prevent the mobile device protection shell from blocking the charging port of the body 1; in addition, in order to improve the protection effect on the charging port of the mobile device, a sealing cover (not shown in the figure) may be disposed at the charging avoidance opening 11, and the sealing cover may seal the charging avoidance opening 11, so as to prevent foreign matters such as external dust or particles from entering the charging port of the mobile device, and improve the service life of the mobile device.

Specifically, the structure and the size of the charging avoidance opening 11 can be correspondingly designed according to the structure and the size of a charging port of the mobile equipment to be installed, and the charging avoidance opening 11 can be integrally formed along with the formation of the body 1; the cover and the body 1 can be formed in a split manner, or under certain conditions, the cover and the body 1 can be formed in an integrated manner, the cover and the body 1 are movably connected, for example, the cover and the body can be connected in a sliding connection manner or a rolling connection manner, or the cover and the body can be connected through a flexible connecting belt, the cover can be opened under the condition that the mobile equipment needs to be charged, and the cover cannot be separated from the body 1 under the action of the flexible connecting belt; accordingly, after the charging work is completed, the cover is mounted to the body 1 again to close the charging avoidance opening 11.

Further, the utility model provides a can also be provided with output plug (not shown in the figure) on the mobile device protective housing to after mobile device installs in the mobile device protective housing, be connected to together photovoltaic module 2 with the charging mouth of mobile device with the help of this output plug, in order to carry the produced electric energy of photovoltaic module 2 to the mobile device. Specifically, the output plug can be integrally formed with the body 1, and the connecting wire between the output plug and the photovoltaic module 2 can also be internally arranged in the body 1, the specific structure of the output plug can be correspondingly selected according to the mobile device required to be configured, and the position of the output plug can be correspondingly selected according to the mobile device required to be configured, so that after the mobile device is installed in the body 1, the output plug can be directly inserted into the charging port of the mobile device. Obviously, in the case of the mobile device protection shell adopting the above structure, the photovoltaic module 2 and the mobile device can be directly connected together, so that an intermediate transition device is omitted, which can further improve the convenience of the mobile device protection shell.

Further, in order to make the user need not to take off this mobile device protective housing, can carry out normal operation of charging to the mobile device, preferably, the utility model provides a still be provided with input interface (not shown in the figure) on the mobile device protective housing, input interface cooperatees with output plug to at the in-process that needs charge and data transmission for the mobile device, directly with data line or charging wire connection to input interface can, this can greatly promote the convenience in use of this mobile device protective housing.

Specifically, the input interface may be provided on the body 1, and more specifically, the input interface may be provided at the tail of the output plug, which may save the installation space on the body; in addition, the transmission distance between the input interface and the output plug can be shortened, so that energy loss is reduced, and the transmission speed can be increased to a certain extent.

Further, the utility model provides a mobile device protective housing can also include containing portion 3, and makes containing portion 3 swing joint on the casing, is formed with accommodation space between containing portion 3 and the casing to accomodate photovoltaic module 2 with the help of this accommodation space, and provide certain guard action to photovoltaic module 2.

Specifically, the receiving portion 3 may have a square structure, and a movable connection relationship such as a rotational connection or a sliding connection may be formed between the receiving portion 3 and the body 1, for example, a slide may be provided between the body 1 and the receiving portion 3, so that a reliable movable connection relationship is formed between the receiving portion 3 and the body 1 by the connection function of the slide; or, the receiving portion 3 and the body 1 can be rotatably connected by a rotating shaft or a flexible material, and the receiving portion 3 can be moved relative to the body 1 to expose the photovoltaic module 2 to generate power through the photovoltaic module 2 when the photovoltaic module 2 needs to be opened; accordingly, under the condition that the photovoltaic module 2 does not need to be used continuously, the photovoltaic module 2 can be folded well, and then the photovoltaic module 2 can be accommodated in the accommodating space between the accommodating part 3 and the body 1 by restoring the accommodating part 3 to the original position.

More specifically, body 1 and storage portion 3 all can adopt flexible material such as silica gel to make, and under this condition, the two can adopt integrated into one piece's mode to form, and can be formed with between body 1 and the storage portion 3 and rotate the relation of connection, and the user of being convenient for uses, and can reduce the component of whole mobile device protective housing, reduces the processing degree of difficulty, promotes production efficiency. The direction of the rotation shaft when the housing portion 3 and the main body 1 are relatively rotated may be various, and for example, the rotation shaft may extend in the longitudinal direction of the main body 1 or in the width direction of the main body 1, and is not particularly limited herein. Moreover, the free ends of the body 1 and the accommodating part 3 can form a fixed connection relationship in a clamping manner, an adhesion manner or the like, so that the accommodating part 3 and the body 1 can form a reliable fixed connection relationship under the condition that the photovoltaic module 2 is not needed, the accommodating part 3 is prevented from being automatically opened, and the photovoltaic module 2 can be opened or even damaged.

Further, as shown in fig. 1, the receiving portion 3 may include a cover plate 31 and a first magnetic portion 32, a rotational connection relationship is formed between the cover plate 31 and the body 1, the first magnetic portion 32 is connected to the cover plate 31, a second magnetic portion (not shown in the figure) is disposed on the body 1, the first magnetic portion 32 and the second magnetic portion attract each other, and further, the receiving portion 3 may be fixed to the body 1 in a manner that the first magnetic portion 32 and the second magnetic portion attract each other without using the photovoltaic module 2.

Specifically, the cover plate 31 may have a rectangular structure, and in order to ensure that a storage space meeting the requirement is formed between the storage portion 3 and the body 1, optionally, both ends of the cover plate 31 may be formed with an extending structure to one side of the cover plate 31, so as to form a gap of a certain size between the cover plate 31 and the body 1, in this case, one of the two extending structures may be movably connected to the body 1, specifically, may be rotatably connected to the other, and the other may be connected to the first magnetic portion 32, and accordingly, the second magnetic portion may be installed at a corresponding position on the body 1, so as to attract the first magnetic portion 32 to the second magnetic portion under the condition that the storage portion 3 and the body 1 are required to be fixed. The first magnetic part 32 and the second magnetic part can be both natural magnets, and the first magnetic part and the second magnetic part can be respectively embedded in the cover plate 31 and the body 1 in an integrated injection molding mode, so that the processing convenience is improved.

Further, the other two sides of the cover plate 31 may be provided with a blocking structure (not shown in the figure), the blocking structure is arranged between the two extending structures, the size of the blocking structure can be determined according to actual conditions, and a gap is arranged between the blocking structure and the extending structure, so as to ensure that the cover plate 31 can normally act relative to the body 1.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A mobile device protective housing is applied to mobile device, its characterized in that includes:

the mobile equipment comprises a body (1), wherein the body (1) is provided with a containing surface (13) and an exposed surface, the containing surface (13) and the exposed surface are oppositely arranged, and the containing surface (13) is used for wrapping the mobile equipment;

photovoltaic module (2), photovoltaic module (2) set up in on the exposed surface, photovoltaic module (2) have first crease (21) and second crease (22), first crease (21) with second crease (22) are crossing.

2. The protective case of claim 1, wherein the first fold (21) and the second fold (22) form an included angle α between them, 0 ° < α <90 °, or 90 ° < α <180 °.

3. The protective case according to claim 1, wherein the first fold (21) and the second fold (22) are each provided in plurality, the first folds (21) are parallel to each other, and the second folds (22) between any two of the first folds (21) are parallel to each other.

4. The protective case of claim 1, wherein the photovoltaic module (2) is folded in a three-pump fold configuration.

5. The protective case of mobile equipment according to any one of claims 1 to 4, wherein an output interface is arranged on the body (1), and the connection position of the output interface and the photovoltaic module (2) is located in the body (1), and the output interface is used for electrically connecting with the mobile equipment.

6. The protective case of a mobile device according to claim 5, wherein the body (1) has a charging bypass opening (11), the charging bypass opening (11) is disposed opposite to a charging interface of the mobile device, and the charging bypass opening (11) is provided with a cover movably connected to the body (1).

7. The protective case of a mobile device according to any one of claims 1 to 4, wherein an output plug is arranged on the body (1), an input end of the output plug is connected with the photovoltaic module (2), and the output plug is used for being in plug-in fit with a charging interface of the mobile device.

8. A protective case for a mobile device according to claim 7, characterised in that the output plug is provided with an input interface arranged on the body (1) for connection with an input device.

9. The protective case of any one of claims 1 to 4, further comprising a receiving portion (3), wherein the receiving portion (3) is movably connected with the body (1) and forms a receiving space therebetween, and the photovoltaic module (2) is received in the receiving space.

10. The protective case of claim 9, wherein the receiving portion (3) comprises a cover plate (31) and a first magnetic portion (32) connected to the cover plate (31), the cover plate (31) is rotatably connected to the body (1), and a second magnetic portion is disposed on the body (1), and the first magnetic portion (32) and the second magnetic portion attract each other.