CN213991239U - Protective shell - Google Patents

Abstract

The utility model relates to a protective housing. The protective shell comprises a back plate and side edges connected with the back plate, wherein the back plate and the side edges enclose a cavity for mounting a protected object; the side has a plurality of limit portions, and adjacent limit portion connects and forms the bight, is provided with the third gasbag in the bight, and the third gasbag is filled with compressed gas. The protective shell has a cavity for mounting a protected object, and the protected object can be an electronic device such as a mobile phone and a tablet computer. The third air bag is arranged in the corner, compressed gas is filled in the third air bag, the compressed gas and the third air bag form the air spring, and when the electronic equipment falls naturally, the electronic equipment can play a role in buffering through the air spring. In addition, because the third air bag is filled with compressed air, the buffer effect of the third air bag is improved, and the falling resistance of protected objects such as mobile phones is improved. In addition, the air spring is used as a buffer piece, so that the weight of the protective shell is reduced, and the protective shell is lighter.

Description

Protective shell

Technical Field

The utility model relates to an accessory technical field of electronic product especially relates to a protective housing.

Background

Electronic devices such as mobile phones and tablet computers have become more and more products that cannot be separated from people in life, and therefore protection of the electronic products is more and more emphasized by people.

For example, a mobile phone as a device with a very high technology integration level has very poor anti-falling performance, and sometimes the mobile phone cannot be repaired due to an inadvertent collision, which is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a protective case for protecting the object.

A protective shell comprises a back plate and side edges connected with the back plate, wherein the back plate and the side edges enclose a cavity for mounting a protected object; the side has a plurality of limit portions, and adjacent limit portion connects and forms the bight, be provided with the third gasbag in the bight, it has compressed gas to fill in the third gasbag.

In one embodiment, the third airbag includes a first extension and a second extension that communicate, the first extension extending into one of the adjacent side portions, and the second extension extending into the other of the adjacent side portions.

In one embodiment, the first extension portion is provided with a spring airbag group along the axial direction of the first extension portion, the spring airbag group comprises a plurality of airbag single bodies which are stacked and communicated along the axial direction of the first extension portion, and each airbag single body has a plurality of groups of radial dimensions with different values along the axial direction of the first extension portion.

In one embodiment, the second extension portion is provided with a spring airbag group along the axial direction of the second extension portion, the spring airbag group comprises a plurality of airbag single bodies which are stacked and communicated along the axial direction of the second extension portion, and each airbag single body has a plurality of groups of radial dimensions with different values along the axial direction of the second extension portion.

In one embodiment, a first air bag is arranged at the joint of the back plate and the side edge, and the first air bag is communicated with the third air bag.

In one embodiment, the first balloon is annular.

In one embodiment, a camera opening is arranged on the back plate, and a second air bag is arranged at the edge of the camera opening.

In one embodiment, the second air bag is communicated with the third air bag.

In one embodiment, the back plate has a first face and a second face disposed opposite to each other, the first face being located within the cavity, and the second face being provided with a fourth air cell.

In one embodiment, the fourth balloon is filled with a compressed gas, and the density of the compressed gas in the fourth balloon is less than the density of the compressed gas in the third balloon.

The protective shell has a cavity for mounting a protected object, and the protected object can be an electronic device such as a mobile phone and a tablet computer. The third air bag is arranged in the corner, compressed gas is filled in the third air bag, the compressed gas and the third air bag form the air spring, and when the electronic equipment falls naturally, the electronic equipment can play a role in buffering through the air spring. In addition, because the third air bag is filled with compressed air, the buffer effect of the third air bag is improved, and the falling resistance of protected objects such as mobile phones is improved. In addition, the air spring is used as a buffer piece, so that the weight of the protective shell is reduced, and the protective shell is lighter.

Drawings

Fig. 1 is a schematic perspective view of a protective shell according to an embodiment of the present invention;

fig. 2 is a front view of the back side of the protective case shown in fig. 1;

fig. 3 is a schematic view of the structure in a corner of the protective shell in an embodiment of the invention;

fig. 4 is a front view of the back side of the protective shell in one embodiment of the invention.

Reference numerals: 110. a back plate; 111. a first side; 112. a second face; 120. a side edge; 130. a cavity; 140. an edge portion; 141. a first edge portion; 142. a second edge portion; 143. a third edge portion; 144. a fourth edge portion; 150. a corner portion; 151. a first corner portion; 152. a second corner portion; 153. a third corner portion; 154. a fourth corner portion; 160. a spring airbag group; 161. an air bag monomer; 210. a first air bag; 220. a second air bag; 221. a camera opening; 230. a third air cell; 231. a first extension portion; 232. a second extension portion; 240. and a fourth air bag.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As shown in fig. 1, fig. 1 is a schematic perspective view of a protective shell according to an embodiment of the present invention. Fig. 2 is a front view of the back side of the protective case shown in fig. 1.

The protective case includes a back plate 110 and a side 120 connecting the back plate 110. For example, the back plate 110 is rectangular and the sides 120 are annular. The annular side 120 is connected to the edge of the back plate 110. The back plate 110 and the side 120 enclose a cavity 130 for mounting a protected object. The protected object can be an electronic device such as a mobile phone and a tablet personal computer. It should be understood that the shape of the cavity 130 of the protective case corresponds to the shape of the protected object, so that the protected object is just installed in the cavity 130. As shown in fig. 1, the cavity 130 has an opening, and the protected object may be installed into the cavity 130 from the opening of the cavity 130. For example, when the protected object is a mobile phone, the mobile phone has a display screen, and when the mobile phone is installed in the cavity 130, the back of the mobile phone can be abutted against the bottom of the cavity 130, and the display screen of the mobile phone is exposed through the opening of the cavity 130 so as to be conveniently viewed through the opening of the cavity 130.

Wherein, the first air bag 210 is disposed at the connection position of the back plate 110 and the side 120.

For example, as shown in fig. 2, the first airbag 210 is specifically disposed on the back plate 110, and the first airbag 210 is disposed on a portion of the back plate 110 near the side 120. The arrangement close to the side 120 is understood here to mean that the first airbag 210 lies almost against the side 120, and that the first airbag 210 has a certain clearance from the side 120, which clearance may be of the order of 1 mm. The specific value is not limited to 1 mm.

For another example, the first airbag 210 is specifically disposed on the side 120, and the first airbag 210 is located at a position of the side 120 close to the back plate 110. Here, the proximity to the back plate 110 still means that the first airbag 210 is almost close to the back plate 110, and also means that the first airbag 210 has a certain gap with the back plate 110, and the gap may be about 1 mm. The specific value is not limited to 1 mm.

For another example, the first bladder 210 may be disposed partially on the side 120 and partially on the back panel 110. Taking fig. 2 as an example, the annular first airbag 210 in fig. 2 may be widened toward the outer periphery of the annular shape such that the inner periphery of the first airbag 210 is disposed on the back plate 110 and the outer periphery of the first airbag 210 is disposed on the side 120.

As shown in fig. 2, the first balloon 210 has a ring shape. For example, when the back plate 110 is rectangular, the first air cells 210 are disposed along a circular path at the outer periphery of the back plate 110, and the circular first air cells 210 also substantially enclose a rectangular area. For example, the first air bag 210 may protrude from the surface of the back plate 110, and when the back of the protective shell is grounded, the first air bag 210 may be grounded first, and the back plate 110 may not directly contact the ground, thereby preventing the back plate 110 from being impacted by the ground.

In one embodiment, first bladder 210 is filled with a fluid medium. Wherein, the solid portion of the first airbag 210 is made of elastic material. The fluid medium can be compressed air or liquid. When the first bladder 210 is filled with compressed air, the first bladder 210 is not actually a vacuum structure. When the first airbag 210 lands on the ground and receives an impact, a solid portion of the first airbag 210 is elastically deformed due to the impact, and a solid portion of the first airbag 210, i.e., a wall of the first airbag 210, since air itself is one of the fluids, the air can be redistributed in the elastically deformed first airbag 210 and always maintain a state of being inflated with the first airbag 210. When the first bladder 210 is filled with compressed air, the pressure of the compressed air is greater than the atmospheric pressure, and the density of the compressed air is greater than that of the air under the atmospheric pressure, so that the compression resistance of the compressed air is weaker than that of the air under the atmospheric pressure, and the elasticity of the compressed air is better.

As shown in fig. 2, a camera opening 221 is formed on the back plate 110, and a second air bag 220 communicating with the first air bag 210 is disposed at an edge of the camera opening 221. In the embodiment shown in fig. 2, the first bladder 210 has a complete ring shape, and the two ends of the second bladder 220 are respectively connected to different portions of the first bladder 210. It is understood that in other embodiments, the second air bag 220 may completely surround the camera opening 221, the first air bag 210 is also completely surrounded, the first air bag 210 is sleeved outside the second air bag 220, and the first air bag 210 is communicated with the second air bag 220. Since the first airbag 210 is in communication with the second airbag 220, the first airbag 210 and the second airbag 220 are both filled with a fluid medium, which may be compressed air or a liquid. It will be appreciated that, since the first balloon 210 is connected to the second balloon 220, the density of the fluid medium in the first balloon 210 is the same as the density of the fluid medium in the second balloon 220. Accordingly, first airbag 210 and second airbag 220 have substantially the same cushioning properties. Specifically, the back plate 110 has a first surface 111 and a second surface 112 disposed opposite to each other, and the first surface 111 is located in the cavity 130. The first and second bladders 210, 220 may each be disposed on the second side 112 of the back plate 110, and the first and second bladders 210, 220 may each protrude from the second side 112 of the back plate 110. Since the second air bag 220 protrudes from the second surface 112 of the back plate 110, when the protective shell is placed on a table, the second air bag 220 can be supported on the table, so that the camera on the protected object is prevented from contacting the table, and the camera is prevented from being worn. In addition, when the protective shell provided with the protected object falls down, the second air bag 220 can prevent the camera of the protected object from contacting the ground, and the camera can be protected. In addition, because the first airbag 210 is communicated with the second airbag 220, when the protective shell is produced, only the first airbag 210 or the second airbag 220 needs to be inflated, and the first airbag 210 and the second airbag 220 do not need to be inflated respectively, so that the production process is simplified.

Both first bladder 210 and second bladder 220 are filled with a fluid medium. When the protective case is dropped, the air cells filled with fluid medium can attenuate the reaction force or impact of the ground. For example, the air bladder can help absorb shocks and vibrations caused when the protective shell is in contact with the ground. The bladder must be strong enough to withstand the above-mentioned impacts. The bladder may be made of a flexible material such as an elastomer or plastic, provided that the material is strong and flexible enough to perform the functions described above. The fluid medium in the air bag can be air or other gas, the air or other gas is lighter than solid material, and the first air bag 210 and the second air bag 220 have the advantages of good elasticity and enough softness.

In one embodiment, as shown in FIG. 2, the side 120 has a plurality of edges 140, with adjacent edges 140 being connected to form corners 150. As shown in fig. 3, fig. 3 is a schematic view of the structure in the corner portion 150 according to an embodiment, and a third air bag 230 is disposed in the corner portion 150. For example, the sides 140 of the protective shell may include a first side 141, a second side 142, a third side 143, and a fourth side 144. The corner portions 150 of the protective shell include a first corner portion 151, a second corner portion 152, a third corner portion 153, and a fourth corner portion 154. The junction of the first and fourth sides 141 and 144 forms a first corner 151, the junction of the first and second sides 141 and 142 forms a second corner 152, the junction of the second and third sides 142 and 143 forms a third corner 153, and the junction of the third and fourth sides 143 and 144 forms a fourth corner 154. The first corner 151, the second corner 152, the third corner 153, and the fourth corner 154 are each provided with a third air bag 230. The third balloon 230 may be filled with a fluid medium.

For example, the fluid medium in the third bladder 230 may be compressed air. That is, the third bladder 230 is not a vacuum structure. When the third airbag 230 lands and receives an impact, the airbag wall of the third airbag 230 is elastically deformed by the impact, so that the compressed air is redistributed in the third airbag 230 and always maintains a state of being inflated in the third airbag 230. The compressed air has a pressure greater than atmospheric pressure and a density greater than that of the air at atmospheric pressure, so that the compressed air has a lower pressure resistance than that of the air at atmospheric pressure and a better elasticity.

For example, the third balloon 230 may be in communication with the first balloon 210. When the protective shell is produced, only the first air bag 210 or the third air bag 230 needs to be inflated, and the first air bag 210 and the third air bag 230 do not need to be inflated respectively, so that the production process is simplified.

In one embodiment, a protective shell is provided, which may be formed of soft or hard rubber. The protective shell has a first bladder 210, a second bladder 220, and a third bladder 230. The first airbag 210, the second airbag 220 and the third airbag 230 are communicated, and the first airbag 210, the second airbag 220 and the third airbag 230 are all filled with fluid medium. The fluid medium may be, for example, compressed air, a liquid, or the like. The protective shell in this embodiment includes a back plate 110 and side edges 120, and the back plate 110 and the side edges 120 enclose a cavity 130 for installing a protected object. The side 120 has a plurality of edges 140, with adjacent edges 140 being joined to form corners 150. The third air bag 230 is disposed in the corner portion 150. A first bladder 210 is disposed at the junction of the back plate 110 and the side 120. The back plate 110 is provided with a camera opening 221, and the second airbag 220 is disposed at an edge of the back plate 110 at the camera opening 221. A protected object such as a cellular phone is mounted in the cavity 130. When the protective shell naturally falls, the falling posture is random, the side 120 may be grounded, the part where the back plate 110 and the side 120 are connected may be grounded, and the camera part of the mobile phone may be grounded. The protective case of this embodiment, when the side 120 lands on the ground, performs the cushioning and shock-absorbing function by the third air cell 230 provided in the corner portion 150; when the connecting part of the back plate 110 and the side 120 is grounded, the first air bag 210 arranged at the connecting part of the back plate 110 and the side 120 plays a role of buffering and shock absorption; when the camera part of the mobile phone is grounded, the second air bag 220 arranged at the edge of the camera opening 221 plays a role of buffering and shock absorption. Therefore, the protective shell can play a role in damping and protecting protected objects such as a mobile phone in multiple angles and multiple directions. And traditional protective housing adopts multilayer materials such as hard plastic, soft plastic or metal to make mostly, need reach certain thickness and just can play and prevent falling the effect, consequently can lead to the protective housing bulky, and weight is big, prevents falling unable balance between nature and the portability. The protective shell in the embodiment is filled with fluid media such as compressed air and the like with light weight and good elasticity, so that the protective shell not only plays a role of comprehensively protecting protected objects such as mobile phones, but also is lighter and lighter.

In one embodiment, as shown in fig. 3, the third air bag 230 includes a first extension 231 and a second extension 232, and the first extension 231 and the second extension 232 communicate. The first extension 231 extends into one of the adjacent side portions 140 and the second extension 232 extends into the other of the adjacent side portions 140. For example, the first extending portion 231 extends along a first direction, the second extending portion 232 extends along a second direction, and an included angle between the first direction and the second direction may be 90 ° or substantially 90 °. Specifically, the corner 150 is actually formed by the intersection of two sides 140. As shown in fig. 3, a first corner 151 is formed at a position where the first side 141 and the fourth side 144 meet, and the first corner 151 is formed by a portion of the first side 141 and a portion of the fourth side 144.

As shown in fig. 3, the first extension 231 is provided with a spring airbag unit 160 along the axial direction thereof, the spring airbag unit 160 includes a plurality of airbag units 161 stacked and communicated along the axial direction of the first extension 231, and each airbag unit 161 has a plurality of sets of radial dimensions with different values along the axial direction of the first extension 231. For example, there are three stacked and connected bladder units 161 along the axial direction of the first extension 231. The cross section of each air cell 161 along the axial direction of the first extension 231 may be an ellipse, that is, the radial dimension of each air cell 161 along the first extension 231 gradually increases and then gradually decreases; for another example, each of the bladder units 161 may first gradually decrease in radial dimension and then gradually increase in radial dimension along the first extension 231. These bladder cells 161 are stacked to form a spring-like structure so that the spring bladder set 160 forms an air spring.

In one embodiment, the second extension 232 is provided with a spring bladder set 160 axially along itself. The spring airbag unit 160 in this embodiment has a structure similar to that of the spring airbag unit 160 in the above-described embodiment, and each includes a plurality of stacked and communicated airbag units 161. Specifically, these bladder cells 161 are stacked in the axial direction of the second extension 232. Each of the balloon cells 161 has a plurality of sets of radial dimensions of different values in the axial direction of the second extension 232. It should be understood that the number of the air bag units 161 in the spring air bag set 160 may not be limited to three in the above-mentioned embodiments, and the number of the air bag units 161 may be flexibly selected according to the size of the protective shell and the requirement of the shock resistance of the protective shell.

Fig. 4 is a front view of the back side of the protective shell in one embodiment, as shown in fig. 4. The protective shell can be made of soft glue or hard glue and the like. The protective case has a first air bag 210, a second air bag 220, a third air bag 230, and a fourth air bag 240, the third air bag 230 not being shown in fig. 4, the third air bag 230 being provided in four corner portions 150 of the protective case, the four corner portions 150 being a first corner portion 151, a second corner portion 152, a third corner portion 153, and a fourth corner portion 154, respectively. The protective shell comprises a back plate 110 and side edges 120, and the back plate 110 and the side edges 120 enclose a cavity 130 for mounting a protected object. The side 120 has a plurality of edges 140, and adjacent edges 140 are joined to form the corner 150. A first bladder 210 is disposed at the junction of the back plate 110 and the side 120. The back plate 110 is provided with a camera opening 221, and the second airbag 220 is disposed at an edge of the back plate 110 at the camera opening 221. A protected object such as a cellular phone is mounted in the cavity 130. The back plate 110 has a first surface 111 and a second surface 112 disposed opposite to each other, and the first surface 111 is located in the cavity 130. The fourth bladder 240 is disposed on the second face 112. The fourth bladder 240 may protrude from the surface of the second face 112.

When the fourth airbag 240 is not communicated with the first airbag 210, the second airbag 220 and the third airbag 230, the first airbag 210, the second airbag 220 and the third airbag 230 may be filled with compressed air, and the fourth airbag 240 may be filled with normal pressure air, that is, the density of the fluid medium in the fourth airbag 240 is less than the density of the fluid medium in the first airbag 210, the second airbag 220 and the third airbag 230. The number of the fourth air cells 240 may be plural, and the plural fourth air cells 240 may not be communicated with each other, or the plural fourth air cells 240 may be communicated with each other. In fig. 4, a plurality of parallel fourth air cells 240 are provided on the second surface 112 of the back plate 110.

Since the process of filling the compressed air is difficult, it is necessary to ensure that the portions, which are likely to collide with the ground when falling, are protected by the air bags filled with the compressed air, i.e., the first air bag 210, the second air bag 220, and the third air bag 230 are filled with the compressed air. Because the power of the back plate 110 landing is low when the back plate falls, the fourth air bag 240 is filled with normal pressure air, and the scheme can reduce the processing difficulty.

When the protective case is manufactured, an opening may be formed in the airbag, and then the airbag may be inflated. After inflation, the opening is sealed.

When the protective case in the above embodiment falls naturally, the falling posture is random, there may be a case where the side 120 lands, a case where the back plate 110 and the side 120 are connected to each other lands, a case where the camera of the mobile phone lands, and a case where the back plate 110 lands. When the side 120 lands, a cushioning and shock-absorbing function is performed by the third air bag 230 provided in the corner 150; when the connecting part of the back plate 110 and the side 120 is grounded, the first air bag 210 arranged at the connecting part of the back plate 110 and the side 120 plays a role of buffering and shock absorption; when the camera part of the mobile phone is grounded, the second air bag 220 arranged at the edge of the camera opening 221 plays a role in buffering and shock absorption; when the backboard 110 lands, the buffering and shock absorption effects are achieved by the fourth air bag 240 provided on the backboard 110.

Therefore, the protective shell can play a role in damping and protecting protected objects such as a mobile phone in multiple angles and multiple directions. And traditional protective housing adopts multilayer materials such as hard plastic, soft plastic or metal to make mostly, need reach certain thickness and just can play and prevent falling the effect, consequently can lead to the protective housing bulky, and weight is big, prevents falling unable balance between nature and the portability. The protective shell in the embodiment is filled with fluid media such as compressed air and the like with light weight and good elasticity, so that the protective shell plays a role in comprehensively protecting protected objects such as mobile phones and the like, and is lighter and more convenient.

It is noted that in some embodiments, the protective shell may include one or more of the first bladder 210, the second bladder 220, the third bladder 230, and the fourth bladder 240. Any two or any three or four of the first, second, third and fourth airbags 210, 220, 230, 240 may be non-communicating.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

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

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A protective case, comprising a back plate (110) and sides (120) connecting the back plate (110), the back plate (110) and the sides (120) enclosing a cavity (130) for mounting a protected object; the side edge (120) is provided with a plurality of side parts (140), adjacent side parts (140) are connected to form a corner part (150), a third air bag (230) is arranged in the corner part (150), and compressed gas is filled in the third air bag (230).

2. A protective case according to claim 1, characterised in that the third bladder (230) comprises a first (231) and a second (232) extension in communication, the first extension (231) extending into one of the adjacent sides (140) and the second extension (232) extending into the other of the adjacent sides (140).

3. The protective case according to claim 2, wherein the first extension portion (231) is provided with a spring airbag set (160) along its own axial direction, the spring airbag set (160) includes a plurality of airbag units (161) stacked and communicated along the axial direction of the first extension portion (231), and each airbag unit (161) has a plurality of sets of radial dimensions of different values along the axial direction of the first extension portion (231).

4. A protective casing according to claim 2 or 3, wherein the second extension (232) is provided with a spring-air-bag set (160) along its own axial direction, the spring-air-bag set (160) comprising a plurality of air-bag single bodies (161) stacked and communicating along the axial direction of the second extension (232), each air-bag single body (161) having a plurality of sets of radial dimensions of different values along the axial direction of the second extension (232).

5. A protective case according to claim 1, characterised in that a first air cell (210) is provided at the junction of the back plate (110) and the side edge (120), the first air cell (210) being in communication with the third air cell (230).

6. A protective casing according to claim 5, characterised in that the first bladder (210) is annular.

7. A protective case according to claim 1, characterised in that a camera opening (221) is provided in the back plate (110), the edge of the camera opening (221) being provided with a second air pocket (220).

8. A protective case according to claim 7, characterised in that the second bladder (220) communicates with the third bladder (230).

9. A protective case according to claim 1, characterised in that the back plate (110) has first (111) and second (112) oppositely disposed faces, the first face (111) being located within the cavity (130), the second face (112) being provided with a fourth bladder (240).

10. A protective casing according to claim 9, characterised in that the fourth air cell (240) is filled with a compressed gas, the density of the compressed gas in the fourth air cell (240) being less than the density of the compressed gas in the third air cell (230).

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