CN215731402U

CN215731402U - Keycap, key assembly and mobile terminal

Info

Publication number: CN215731402U
Application number: CN202121316326.7U
Authority: CN
Inventors: 谭雄
Original assignee: Shenzhen Ucloudlink New Technology Co Ltd
Current assignee: Shenzhen Ucloudlink New Technology Co Ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-02-01
Anticipated expiration: 2031-06-11

Abstract

The utility model provides a keycap, a key assembly and a mobile terminal, and belongs to the technical field of electronic equipment, wherein the keycap is connected with a shell, the shell is provided with a keycap hole, and the inner wall surface of the shell at the periphery of the keycap hole is provided with a demoulding inclination angle compared with the central axis of the keycap hole; the key cap comprises a cap main body and a flanging body, and the cap main body is inserted into the key cap hole; the flanging body is connected to one end of the cap main body and is coaxially arranged with the cap main body, the flanging body protrudes out of the periphery of the cap main body and is provided with a flanging matching surface facing the cap main body, the flanging matching surface is provided with a matching inclination angle compared with the central axis of the cap main body, and the matching inclination angle is approximately the same as the demoulding inclination angle of the inner wall surface of the shell, so that when the cap main body is inserted into the keycap hole, the flanging matching surface is approximately parallel to the inner wall surface of the shell; the key assembly comprises the keycap; the mobile terminal comprises the key assembly. The utility model aims to solve the technical problem that the key part of the mobile terminal is easy to shake in the shell in the prior art.

Description

Keycap, key assembly and mobile terminal

Technical Field

The utility model belongs to the technical field of electronic equipment, and particularly relates to a keycap, a key assembly and a mobile terminal.

Background

With the continuous development of electronic technology, portable mobile terminals such as mobile phones and palm computers have become the most common communication tools in daily life. The key structure is an important component of electronic equipment such as a portable mobile terminal, and man-machine interaction between a user and the electronic equipment can be realized by pressing the key structure.

In order to enable the housing to be demolded well in the manufacturing process of the housing of the mobile terminal, a certain demolding inclination is generally designed for the housing, that is, an inner wall surface of the housing needs to have a demolding inclination angle. In the prior art, after the button structure is installed on the shell, because the inner wall of the shell has a demoulding inclination angle, a large gap exists between the common button structure and the inner wall of the shell, and a concentrated stress point is easy to exist, so that the button structure is easy to shake or clamp keys in the shell, and the user experience is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a keycap, a key assembly and a mobile terminal, and aims to solve the technical problem that in the prior art, a key part of the mobile terminal is easy to shake in a shell due to an overlarge gap between the keycap and the inner wall surface of the shell.

The first purpose of the utility model is to provide a keycap, which is used for being connected with a shell, wherein the shell is provided with a keycap hole, and the inner wall surface of the shell at the periphery of the keycap hole is provided with a demoulding inclination angle compared with the central axis of the keycap hole; the key cap includes:

the cap main body is inserted into the keycap hole and can be coaxial with the keycap hole; and

the turn-ups body, connect in the one end of cap main part and with the coaxial setting of cap main part, turn-ups body protrusion in the periphery of cap main part sets up to have the orientation the turn-ups fitting surface of cap main part, the turn-ups fitting surface have compare in the cooperation inclination of the axis of cap main part, the cooperation inclination with the shells inner wall face has the drawing of patterns inclination is roughly the same, so that the cap main part peg graft in when the key cap is downthehole, the turn-ups fitting surface with shells inner wall face is roughly parallel.

Further, the matching inclination angle is 85-89 degrees.

Furthermore, the flanging body is an annular cylinder, and the flanging matching surface is positioned at one end, close to the cap main body, of the cylinder.

Furthermore, the end face of the cap main body, which is far away from one end of the flanging body, is parallel to the end face of the flanging body, which is far away from one end of the cap main body, and the two end faces are perpendicular to the central axis of the cap main body.

Furthermore, an arc-shaped groove is formed in the flanging matching surface, is located on the flanging matching surface, is close to the side wall of the cap body and is connected with the side wall of the cap body, and is coaxially arranged with the cap body.

Furthermore, a first matching surface and a second matching surface which are connected are arranged on the outer surface of the cap main body along the axial direction, the first matching surface and the second matching surface are annular surfaces which are concentrically arranged, and the first matching surface is far away from the flanging body; the first matching surface has a first inclination angle compared with the central axis of the cap body, the second matching surface has a second inclination angle compared with the central axis of the cap body, and the first inclination angle is larger than the second inclination angle.

Further, the first inclination angle is 2.0-5 degrees, and the second inclination angle is 0.3-1.5 degrees.

Compared with the prior art, the utility model has the beneficial effects that: compared with the prior art, the flanging matching surface of the key cap is parallel to the inner wall surface of the shell, so that after the cap main body is inserted into the key cap hole, a smaller parallel gap exists between the flanging matching surface and the inner wall surface of the shell, or the flanging matching surface and the inner wall surface of the shell form surface-to-surface fit, so that the gap between the flanging body of the key cap and the inner wall surface of the shell is reduced, the cap main body slides more stably in the key cap hole, and the problems of shaking and key clamping are not easy to generate; in addition, the surface-to-surface contact connection is beneficial to increasing the contact area and reducing stress concentration points, so that the keycap is more uniformly stressed, and the service life of the keycap is prolonged.

The second purpose of the utility model is to provide a key assembly, which comprises a key and the keycap; the key comprises a key body, a first cantilever arranged on one side of the key body and a second cantilever arranged on the other side of the key body and corresponding to the first cantilever; the middle part of the cap main body is provided with a key hole, and the key body is inserted in the key hole.

Furthermore, one end of the first cantilever, which is far away from the key body, is provided with a first hook, one end of the second cantilever, which is far away from the key body, is provided with a second hook, and the first hook and the second hook are different in size or shape.

Compared with the prior art, the utility model has the beneficial effects that: compared with the prior art, the key assembly adopts a split structure, so that the key body is inserted into the key hole, the key body, the first cantilever and the second cantilever are made of silica gel, force is mainly applied to the key body when a user touches the key, the key body slides in the key hole, and the hand feeling of the user is improved; in addition, the key assembly can slide more stably in the key hole, and the problems of shaking and key clamping are not easy to generate.

The third objective of the present invention is to provide a mobile terminal, which includes a casing and the key assembly, wherein the key assembly is connected to an inner surface of the casing, the casing is provided with a key cap hole, and the cap body is inserted into the key cap hole.

Compared with the prior art, the utility model has the beneficial effects that: compared with the prior art, the mobile terminal adopts the design that the flanging matching surface is parallel to the inner wall surface of the shell, when the cap main body is inserted into the key cap hole, a smaller parallel gap exists between the flanging matching surface and the inner wall surface of the shell, or the flanging matching surface and the inner wall surface of the shell are attached, so that the gap between the flanging body of the key cap and the inner wall surface of the shell is reduced, the cap main body slides more stably in the key cap hole, and the problems of shaking and key clamping are not easy to generate; in addition, the surface-to-surface contact connection is beneficial to increasing the contact area and reducing stress concentration points, so that the keycap is stressed more uniformly, and the service life of the keycap is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of a key cap according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a key cap according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the key cap of FIG. 2 in cooperation with the inner wall of the housing;

FIG. 4 is a schematic structural view of the surface of the cap body of FIG. 2;

fig. 5 is an exploded view of a key assembly provided by an embodiment of the present invention;

fig. 6 is a schematic structural view of the key assembly of fig. 5 connected to the housing;

fig. 7 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

Description of reference numerals: 1. a keycap; 101. a cap body; 1011. a first mating surface; 1012. a second mating surface; 1013. a keycap aperture; 102. a flanging body; 1021. a flanging matching surface; 1022. an arc-shaped slot; 1023. an arm slot; 2. a housing; 201. a key hole; 202. an inner wall surface of the housing; 3. pressing a key; 301. a key body; 302. a first cantilever; 303. a second cantilever; 304. a first hook; 305. a second hook; 4. a limiting member; a. matching the inclination angle; b. a first inclination angle; c. a second inclination angle; beta, demolding inclination angle.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "upward", "vertical", "horizontal", "bottom", "inner", "outer", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", etc. 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

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

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

At present, in order to enable the shell to be demolded well in the manufacturing process of the shell of the mobile terminal, a certain demolding inclination is generally designed on the shell, that is, the inner surface (the inner wall surface of the shell) of the shell has a certain demolding inclination angle compared with the central axis of the keycap hole, specifically, in the embodiment, the inner surface of the shell specifically refers to the inner surface of the side wall of the shell. Among the prior art, do not carry out the optimal design to the key cap, because the casing internal face has the drawing of patterns inclination, ordinary key cap install the downthehole back of key cap that is equipped with on the casing, lead to the key cap with have great clearance between the internal surface of casing internal surface complex surface and casing, and then lead to the key cap and even whole key subassembly in the downthehole easy emergence of key cap of casing rock or card key scheduling problem, easily reduce user's experience and feel. In addition, after the common keycap is arranged in a keycap hole formed in the shell, a point contact position exists between the keycap and the inner wall surface (inner surface) of the shell, so that a concentrated stress point exists between the keycap and the shell, and the keycap and even the whole key assembly are easily damaged.

Therefore, in order to solve the technical problems in the prior art that the gap between the keycap and the inner surface of the casing is too large, and the keycap and even the whole key assembly are prone to shaking or key clamping in the keycap hole of the casing, and in order to improve the service life of the keycap, the key assembly and even the mobile terminal and improve the experience of a user, a first object of the embodiment of the present invention is to provide a keycap, please refer to fig. 1-3, wherein the keycap 1 is used for being connected with the casing 2, the casing 2 is provided with a keycap hole 1013, and the inner wall surface 202 of the casing around the keycap hole 1013 has a demolding inclination angle β compared with the central axis of the keycap hole 1013; the keycap 1 comprises a cap main body 101 and a flanging body 102; the cap main body 101 is inserted into the key cap hole 1013 and is coaxial with the key cap hole 1013, the cap main body 101 is a cylinder, preferably a cylinder, and the corresponding key cap hole 1013 is preferably a cylindrical hole; the middle part of the cap main body 101 is provided with a through hole for installing a keycap; the flanging body 102 is connected to one end of the cap main body 101 and is arranged coaxially with the cap main body 101, the flanging body 102 protrudes out of the periphery of the cap main body 101 and is provided with a flanging matching surface 1021 for matching with the inner wall surface 202 of the shell, preferably, the flanging body 102 is a cylinder arranged coaxially with the cap main body 101, and the flanging body 102 can be a cylinder or a cylinder with an irregular cross section, which is not limited herein; the cross-sectional dimension of the flanging body 102 is larger than that of the cap main body 101, so that the flanging body 102 forms a flanging matching surface 1021 which protrudes out of the periphery of the cap main body 101; the flange fitting surface 1021 has a fitting inclination angle a compared with the central axis of the cap body 101, the fitting inclination angle a is substantially the same as the mold release inclination angle β of the inner wall surface of the housing, so that when the cap body 101 is inserted into the key cap hole 1013, the flange fitting surface 1021 is substantially parallel to the inner wall surface of the housing 2, preferably, the fitting inclination angle a is the same as the mold release inclination angle β, and when the cap body 101 is inserted into the key cap hole 1013, the flange fitting surface 1021 is parallel to the inner surface of the housing 2, in this embodiment, the key cap hole 1013 is opened on the side housing wall of the housing 2, so that the key cap 1 is connected to the side housing wall of the housing 2.

In this embodiment, it is preferable that the cap main body 101 and the flange body 102 are two cylinders coaxially connected, a diameter of the flange body 102 is greater than a diameter of the cap main body 101, an end surface of the flange body 102 connected to the cap main body 101 is a flange mating surface 1021, the flange mating surface 1021 is an inclined surface inclined with respect to the end surface, an inclination angle of the inclined surface with respect to a central axis of the cap main body 101 is a mating inclination angle a, that is, an included angle between the flange mating surface 1021 and the central axis of the cap main body 101 is a, and the mating inclination angle a of the flange mating surface 1021 is the same as a de-molding inclination angle of the housing 2 connected to the key cap 1, so that when the cap main body 101 is connected to the key cap hole 1013, the flange mating surface 1021 and the inner surface of the housing 2 at the connection position are parallel to each other.

The beneficial effect of this embodiment lies in: compared with the prior art, the flanging matching surface 1021 of the key cap is parallel to the inner wall surface 202 of the shell, so that after the cap main body 101 is inserted into the key cap hole 1013, a smaller parallel gap exists between the flanging matching surface 1021 and the inner wall surface 202 of the shell, or the flanging matching surface 1021 and the inner wall surface 202 of the shell are attached face to face, so that the gap between the flanging body 102 of the key cap and the inner wall surface 202 of the shell is reduced, the cap main body 101 slides more stably in the key cap hole 1013, and the problems of shaking and key clamping are not easy to occur; in addition, the surface-to-surface contact connection is beneficial to increasing the contact area and reducing stress concentration points, so that the keycap is more uniformly stressed, and the service life of the keycap is prolonged.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 2 and 3, the fitting inclination angle a is 85 ° to 89 °, that is, the angle between the flange fitting surface 1021 and the central axis of the cap main body 101 is 85 ° to 89 °; correspondingly, the mold release inclination angle β of the inner wall surface 202 of the housing at the mounting position of the key cap 1 is kept the same as the fitting inclination angle a.

In the present embodiment, setting the shell 2 at the die-release inclination β of 85 ° to 89 °, the shell 2 is easily released from the die, and the outer shape of the shell 2 is protected; the cooperation inclination angle a should keep unanimous with drawing of patterns inclination beta and be favorable to reducing the clearance between key cap 1 and the casing inner wall 202, make cap main part 101 slide more steadily in key cap hole 1013, difficult production is rocked and the card key, improves user's experience and feels.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 1 and 2, the flange body 102 is a cylinder having a ring shape, and the flange mating surface 1021 is located at one end of the cylinder close to the cap main body 101.

In this embodiment, the flanging body 102 is an annular cylinder protruding out of the cap main body 101, preferably an annular cylinder, and the flanging fitting surface 1021 of the flanging body 102 protruding out of the cap main body 101 is mainly used for fitting with the inner wall surface 202 of the case body, when the key cap 1 is installed, after the cap main body 101 is inserted into the key cap hole 1013, the flanging body 102 abuts against the inner wall surface 202 of the case body, the cap main body 101 is rotated to enable the flanging fitting surface 1021 and the inner wall surface 202 of the case body to be in a parallel position, so that the gap between the flanging body 102 and the inner wall surface 202 of the case body is in a minimum state, the cap main body 101 slides more stably in the key cap hole 1013, shaking and key clamping are not easy to generate, and the experience of a user is improved.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 2, an end surface of the cap main body 101 at an end away from the flanging body 102 is parallel to an end surface of the flanging body 102 at an end away from the cap main body 101, and both end surfaces are perpendicular to the central axis of the cap main body 101; that is to say, the key cap 1 is a step-shaped cylinder, the step surface is the flange matching surface 1021, and since the flange matching surface 1021 has a matching inclination, it can be seen that the thickness (height) of the flange body 102 is variable, and the longitudinal section of the flange body 102 passing through the thinnest position and the thickest position is trapezoidal.

Further, as a preferred embodiment of this embodiment, as shown in fig. 1, an arc-shaped slot 1022 is disposed on the flange mating surface 1021, the arc-shaped slot 1022 is located on the flange mating surface 1021 and is close to the sidewall of the cap main body 101 and is connected to the sidewall of the cap main body 101, the arc-shaped slot 1022 is located on the flange mating surface 1021 connecting the sidewall of the cap main body 101, and the arc-shaped slot 1022 is disposed coaxially with the cap main body 101; when the flanging body 102 is an annular cylinder, the arc-shaped groove 1022 is an annular groove body, the arc-shaped groove 1022 is located at the root position where the cap main body 101 is connected with the flanging body 102, a boss is formed on the outer side of the arc-shaped groove 1022, and the surface of the boss abuts against the inner wall surface 202 of the shell.

In the prior art, in the manufacturing process of the key cap hole 1013, due to the reason of the manufacturing process, burrs are easily generated at the bottom end of the hole wall of the key cap hole 1013, so that the outer surface of the key cap 1 is easily scratched and the key is stuck in the process that the key cap 1 slides in the key cap hole 1013, and therefore in the present embodiment, an arc-shaped groove 1022 is designed at the root position of the arc-shaped groove 1022, where the cap main body 101 is connected with the flanging body 102, and the protruding burrs of the burrs can be accommodated in the arc-shaped groove 1022, so that the burrs are not easily scratched and hit the outer wall of the cap main body 101, thereby maximally reducing the occurrence of the key sticking problem and improving the hand feeling of the key; in addition, the bosses on the two sides are abutted to the inner wall surface 202 of the shell, so that when the key is pressed, the keycap and the key assembly are not easy to shake, and the key is more stable.

Further, as a preferred embodiment of this embodiment, as shown in fig. 4, the cap main body 101 is provided with a first mating surface 1011 and a second mating surface 1012 connected along the axial direction, the first mating surface 1011 and the second mating surface 1012 are circular surfaces concentrically arranged, the first mating surface 1011 is arranged far away from the flanging body 102, and the first mating surface 1011 is arranged far away from the flanging body 102; the first mating surface 1011 has a first inclination angle b compared with the central axis of the cap body 101, the second mating surface 1012 has a second inclination angle c compared with the central axis of the cap body 101, and the first inclination angle b is greater than the second inclination angle c; specifically, the first inclination angle b is 2.0-5 degrees, and the second inclination angle c is 0.3-1.5 degrees.

In this embodiment, a first mating surface 1011 and a second mating surface 1012 are respectively disposed on the side surface of the cap body 101 in the circumferential direction, the first mating surface 1011 is a transition surface connecting the side surface and the end surface of the cap body 101, after the cap body 101 is inserted into the key cap hole 1013, the first mating surface 1011 is not attached to the inner wall of the key cap hole 1013 and is exposed to the outside visually, the first mating surface 1011 is an appearance surface and can be painted, and therefore, the first inclination angle b needs to be greater than the second inclination angle c; the second fitting surface 1012 is mainly located in the key cap hole 1013 and fits with the inner wall of the key cap hole 1013, so the second inclination angle c is smaller than the first inclination angle b, and is mainly used for reducing the gap between the second fitting surface 1012 and the inner wall of the key cap hole 1013, so that the key cap is not easy to shake during the sliding process. In addition, the first inclination angle b and the second inclination angle c are designed to make the gradient difference between the first matching surface 1011 and the second matching surface 1012 smaller, which is beneficial to reducing the gap between the cap main body 101 and the keycap hole 1013.

A second object of the present application is to provide a key assembly, as shown in fig. 5, comprising a key 3 and the above-mentioned key cap 1; the key 3 comprises a key body 301, a first cantilever 302 arranged on one side of the key body 301, and a second cantilever 303 arranged on the other side of the key body 301 and corresponding to the first cantilever 302; the middle part of the cap main body 101 is provided with a key hole 201, the key body 301 is a cylinder, the corresponding key hole 201 is a cylinder hole, the key body 301 is inserted in the key hole 201, the first cantilever 302 and the second cantilever 303 are positioned outside the key hole 201, and the arm length directions of the first cantilever 302 and the second cantilever 303 are perpendicular to the central axis of the key body 301; the end face of the flanging body 102 far away from the cap main body 101 is provided with an arm groove 1023, the arm groove 1023 has a certain depth along the height direction of the flanging body 102, and part of the arm bodies of the first cantilever arm 302 and the second cantilever arm 303 are positioned in the arm groove 1023.

The beneficial effect of this embodiment lies in: compared with the prior art, the case component adopts a split structure, so that the key body 301 is inserted in the key hole 201, the key body 301, the first cantilever 302 and the second cantilever 303 are made of silica gel, when a user touches the key, force is mainly applied to the key body 301, so that the key body 301 slides in the key hole 201, and the hand feeling of the user is improved; in addition, the key assembly slides more stably in the key hole 201, and the problems of shaking and key clamping are not easy to occur.

Further, as a preferred embodiment of this embodiment, as shown in fig. 5, a first hook 304 is disposed at an end of the first cantilever 302 away from the key body 301, a second hook 305 is disposed at an end of the second cantilever 303 away from the key body 301, and the first hook 304 and the second hook 305 are different in size or shape.

In this embodiment, the first hook 304 and the second hook 305 are protrusions protruding from the surfaces of the first cantilever 302 and the second cantilever 303, the first hook 304 and the second hook 305 are mainly used for being connected with a hanging plate or a limiting member 4 or a housing 2 inside the mobile terminal, the protrusions are designed to have different sizes and shapes, and the fool-proof effect is mainly achieved, so that the left and right positions are prevented from being exchanged during installation, and the use is prevented from being affected.

A third objective of the present application is to provide a mobile terminal, which includes a housing 2 and the key assembly, the key assembly is connected to an inner surface of the housing 2, the housing 2 is provided with a key cap hole 1013, and the cap main body 101 is inserted into the key cap hole 1013. Specifically, the mobile terminal can be a card swiping machine.

The beneficial effect of this embodiment lies in: compared with the prior art, the mobile terminal adopts the design that the flanging matching surface 1021 is parallel to the inner wall surface 202 of the shell, after the cap main body 101 is inserted into the key cap hole 1013, a smaller parallel gap exists between the flanging matching surface 1021 and the inner wall surface 202 of the shell, or the flanging matching surface 1021 and the inner wall surface 202 of the shell are attached, so that the gap between the flanging body 102 of the key cap 1 and the inner wall surface 202 of the shell is reduced, the cap main body 101 slides more stably in the key cap hole 1013, and the problems of shaking and key clamping are not easy to generate; in addition, the surface-to-surface contact connection is beneficial to increasing the contact area and reducing stress concentration points, so that the keycap is stressed more uniformly, and the service life of the keycap is prolonged.

The foregoing is considered as illustrative only of the preferred embodiments of the utility model, and is presented merely for purposes of illustration and description of the principles of the utility model and is not intended to limit the scope of the utility model in any way. Any modifications, equivalents and improvements made within the spirit and principles of the utility model and other embodiments of the utility model without the creative effort of those skilled in the art are included in the protection scope of the utility model based on the explanation here.

Claims

1. A key cap is used for being connected with a shell, the shell is provided with a key cap hole, and the inner wall surface of the shell at the periphery of the key cap hole is provided with a demoulding inclination angle compared with the central axis of the key cap hole; characterized in that, the key cap includes:

2. A key cap according to claim 1, wherein the mating inclination is 85 ° to 89 °.

3. The key cap of claim 2, wherein the flanging body is an annular cylinder, and the flanging matching surface is located at one end of the cylinder close to the cap body.

4. A key cap according to any one of claims 1 to 3, wherein the end surface of the cap body remote from the end of the flanging body is parallel to the end surface of the flanging body remote from the end of the cap body, and both end surfaces are perpendicular to the central axis of the cap body.

5. The key cap of claim 1, wherein the flange mating surface is provided with an arc-shaped groove, the arc-shaped groove is located on the flange mating surface, is close to the side wall of the cap body and is connected with the side wall of the cap body, and the arc-shaped groove is coaxially arranged with the cap body.

6. The key cap of claim 1, wherein the outer surface of the cap body is provided with a first matching surface and a second matching surface which are connected along the axial direction, the first matching surface and the second matching surface are concentrically arranged circular rings, and the first matching surface is arranged far away from the flanging body; the first matching surface has a first inclination angle compared with the central axis of the cap body, the second matching surface has a second inclination angle compared with the central axis of the cap body, and the first inclination angle is larger than the second inclination angle.

7. A key cap according to claim 6, wherein the first angle of inclination is from 2.0 ° to 5 ° and the second angle of inclination is from 0.3 ° to 1.5 °.

8. A key assembly comprising a key and a key cap according to any of claims 1-7; the key comprises a key body, a first cantilever arranged on one side of the key body and a second cantilever arranged on the other side of the key body and corresponding to the first cantilever; the middle part of the cap main body is provided with a key hole, and the key body is inserted in the key hole.

9. The key assembly of claim 8, wherein a first hook is disposed at an end of the first cantilever away from the key body, and a second hook is disposed at an end of the second cantilever away from the key body, and the first hook and the second hook have different sizes or shapes.

10. A mobile terminal, comprising a housing and a key assembly according to claim 8 or 9, the key assembly being attached to an inner surface of the housing, the housing being provided with a key cap hole, the cap body being inserted into the key cap hole.