CN210668176U - Key module and mobile terminal - Google Patents

Abstract

The present disclosure relates to a key module and a mobile terminal, the key module includes: the key board comprises a key board, wherein the first surface of the key board is used for detecting key operation; the key body is fixedly arranged on the second surface of the key board, wherein the key body can be used for generating module interaction of key signals, and the second surface is the opposite surface of the first surface; the limiting body is arranged on the second surface of the key board, and the end part of the limiting body is provided with a first form and a second form generated under the action of external force; in the first form, the end of the spacing body has a first size, and in the second form, the end of the spacing body has a second size, the second size being smaller than the first size. So, can realize the joint of button module through the morphological change of spacing body tip, need not additionally to set up spacing support, simplify the part quantity and the installation flow among the mobile terminal, the cost is reduced.

Description

Key module and mobile terminal

Technical Field

The present disclosure relates to the field of □ □ from □, and more particularly to a □ key module and shift □ □.

Background

In the related art, the key module may be installed from the inside of the housing of the mobile terminal to the outside of the housing. When the key module is used, a larger accommodating space needs to be reserved in the mobile terminal shell, so that the available space in the mobile terminal shell is reduced, and the layout of other elements is limited.

In the related art, the key module may be further installed from the outside of the housing of the mobile terminal to the inside of the housing. To this kind of button module, need utilize parts such as pin, steel sheet fixed button module in the mobile terminal casing when the assembly, the assembly process is loaded down with trivial details, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

The disclosure provides a key module and a mobile terminal.

According to a first aspect of the embodiments of the present disclosure, a key module is provided, which includes:

the key board comprises a key board, wherein the first surface of the key board is used for detecting key operation;

the key body is fixedly arranged on the second surface of the key plate; the key body can be used for interacting with a key signal generation module, and the second surface is the opposite surface of the first surface;

the limiting body is arranged on the second surface of the key board, and the end part of the limiting body is provided with a first shape and a second shape generated when external force acts; in the first form, the end of the spacing body has a first dimension, and in the second form, the end of the spacing body has a second dimension; wherein the second size is smaller than the first size.

Optionally, the end of the spacing body comprises:

an elastic member; wherein the elastic member switches from the first form to the second form when an external force acts thereon; the resilient member also returns from the second configuration to the first configuration upon removal of the external force.

Optionally, the end of the spacing body comprises:

at least one notch; wherein, in the first configuration, the notch has a third size; in the second state, the indentation has a fourth dimension; the fourth dimension is less than the third dimension.

Optionally, the end of the spacing body further comprises:

a movable portion and a body; wherein the gap is at least located between the movable portion and the body;

the movable part is used for moving towards a first preset direction under the action of external force so as to enable the end part of the limiting body to generate the second shape; the movable part is also used for moving towards a second preset direction after the action of the external force is cancelled so as to restore the end part of the limiting body from the second shape to the first shape; wherein the first preset direction is opposite to the second preset direction.

Optionally, the shape of the end in the first configuration comprises at least one of:

mushroom head shape;

umbrella shape;

a circular truncated cone shape;

conical shape.

Optionally, when the key module includes a plurality of limiting bodies, the limiting bodies are symmetrically distributed at two ends of the second surface of the key plate.

Optionally, the end of the limiting body is made of an insulator.

According to a second aspect of the embodiments of the present disclosure, there is provided a mobile terminal, including:

the key module of the first aspect;

a first frame body having a first opening and a second opening; the first opening is used for installing a key body of the key module; the second opening is used for installing the limiting body; wherein the second opening has a size between the first size and the second size.

Optionally, the mobile terminal further includes:

the second frame body is positioned on the outer side of the first frame body and is provided with a through hole matched with the key board;

the key plate covers the through hole, the key body penetrates through the through hole and the first opening, and the limiting body penetrates through the through hole and the second opening.

Optionally, the first frame further includes:

the accommodating area is positioned on the inner side of the first frame body and is provided with a concave area matched with the end part of the limiting body;

the end part of the limiting body is positioned in the concave area, so that the limiting body is clamped with the first frame body.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the key body and the limiting body are arranged on the same surface of the key board, and the end part of the limiting body is provided with a first form and a second form generated under the action of external force; the end part of the limiting body has a first size in the first state, and has a second size in the second state, wherein the second size is smaller than the first size, so that the installation and clamping of the key module can be completed through the size change of the end part of the limiting body, a limiting support does not need to be additionally arranged in the mobile terminal, the number of parts in the mobile terminal is simplified, the available space in the shell of the mobile terminal is increased, the installation process is simplified, and the cost is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a block diagram illustrating a key module in accordance with an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating a key module according to an exemplary embodiment;

FIG. 3 is a schematic view of an end of a spacing body according to an exemplary embodiment;

FIG. 4 is a partial schematic view of a mobile terminal;

FIG. 5 is a first schematic view illustrating an installation process of a key module;

FIG. 6 is a schematic view illustrating an installation process of a key module;

FIG. 7 is a third schematic view illustrating an installation process of a key module;

FIG. 8 is a diagram of a mobile terminal;

FIG. 9 is a block diagram illustrating a mobile terminal in accordance with an exemplary embodiment;

FIG. 10 is a schematic diagram illustrating an installation process of a key module according to an exemplary embodiment;

FIG. 11 is a partial schematic diagram illustrating a mobile terminal in accordance with an exemplary embodiment;

FIG. 12 is a diagram illustrating a partial structure of a mobile terminal in accordance with one exemplary embodiment;

FIG. 13 is a block diagram illustrating an apparatus in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Fig. 1 is a block diagram illustrating a key module 100 according to an exemplary embodiment. Referring to fig. 1, the key module includes:

a key sheet 110, wherein a first surface of the key sheet is used for detecting key operations;

a key body 120 fixedly disposed on the second surface of the key sheet 110; the key body 120 can be used for interacting with a key signal generating module, and the second surface is opposite to the first surface;

at least one position limiting body 130, which is arranged on the second surface of the key board 110, and the end part of the position limiting body 130 has a first shape and a second shape generated when external force acts; in the first configuration, the end of the spacing body 130 has a first dimension, and in the second configuration, the end of the spacing body has a second dimension; wherein the second size is smaller than the first size.

In an embodiment of the disclosure, the key module 120 may include: any key of the mobile terminal. For example, side keys of the mobile terminal, etc. may be included. When the key module is a touch switch, the key signal generating module may include: conductive contacts (Dome contacts) and Flexible Printed Circuit (FPC) boards.

Illustratively, the key body 120 and the at least one position limiting body 130 are juxtaposed on the second surface of the key sheet 110.

Illustratively, when the key module 100 is assembled, the end of the position-limiting body 130 is compressed from the periphery to the middle by an external force, so that the end of the position-limiting body 130 is reduced from a first size to a second size, and the end of the position-limiting body 130 can pass through an opening on the mobile terminal housing for installing the key module 100.

After the external force action is cancelled, the end part of the limiting body 130 is switched from the second size to the first size, and the end part of the limiting body in the first shape is clamped with the shell of the mobile terminal, so that the installation of the key module can be realized.

The key module 100 of the embodiment is easy and quick to assemble, the assembly efficiency is improved, a limiting support does not need to be additionally arranged in the shell of the mobile terminal, parts in the mobile terminal are simplified, the space in the shell of the mobile terminal is saved, and the cost is reduced.

In one embodiment, the end of the spacing body 130 includes:

an elastic member that switches from a first form to a second form when an external force acts; the resilient member also returns from the second configuration to the first configuration upon removal of the external force.

Illustratively, the elastic member may include: silica gel, elastomeric polymers, and the like.

In the embodiment of the disclosure, by arranging the end of the limiting body 130 having the elastic component, the end of the limiting body 130 can pass through the opening on the mobile terminal housing in the second state, so that the key module 100 is clamped with the mobile terminal housing, the key module 100 is convenient and fast to install, and the assembly efficiency of the key module 100 is improved.

In one embodiment, the end of the spacing body 130 includes:

at least one notch; wherein, in the first form, the notch has a third size; in the second state, the indentation has a fourth size; the fourth dimension is less than the third dimension.

Illustratively, the shape of the notch may be triangular, scalloped, or the like.

In the embodiment of the disclosure, the notch is arranged at the end part of the limiting body, and under the action of external force, the end part of the limiting body is extruded, so that the size of the notch is reduced, the end part of the limiting body can pass through the opening in the mobile terminal shell in the second form, the installation of the key module is convenient and quick, and the assembly efficiency of the key module is improved.

In one embodiment, as shown in FIG. 3, the end of the spacing body 130 further comprises:

a movable portion 131 and a body 132; wherein, the gap 133 is at least located between the movable portion 131 and the body 132;

the movable part 131 is used for moving towards a first preset direction under the action of external force so as to enable the end part of the limiting body 130 to generate a second shape; the movable part 131 is further used for moving towards a second preset direction after the external force action is cancelled, so that the end part of the limiting body 130 is restored to the first shape from the second shape; the first preset direction is opposite to the second preset direction.

For example, the first preset direction may be a direction directed from the movable portion to the body portion, and the second preset direction may be a direction directed from the body portion to the movable portion.

Fig. 2 shows a schematic diagram of a key module 100. The ends of the spacing body 130 are marked with dashed lines in fig. 2. FIG. 3 shows an enlarged view of the end of the spacing body 130 of FIG. 2.

Referring to fig. 3, the movable portion 131 moves toward the body portion 132 by an external force, so that the end of the stopper 130 can pass through the opening of the mobile terminal case in the second state; after the external force is removed, the movable portion 131 moves in the direction away from the body portion 132, so that the end of the position-limiting body returns to the first shape and is clamped at the corresponding opening of the mobile terminal housing.

In the embodiment of the disclosure, the movable part which can move along the preset first direction and the second direction is arranged, so that the installation of the key module is convenient and quick, and the assembly and maintenance efficiency of the product is improved.

In one embodiment, the shape of the end of the spacing body 130 in the first configuration includes at least one of:

mushroom head shape;

umbrella shape;

a circular truncated cone shape;

conical shape.

In the present exemplary embodiment, the shape of the end of the spacing body 130 in the first form may include an irregular shape, such as a mushroom head, an umbrella, or the like. The shape of the end of the spacing body in the first form may also include regular shapes, such as a cone, a truncated cone, and the like.

Illustratively, as shown in FIG. 3, the end of the spacing body 130 is shaped like a mushroom head in the first configuration.

When the key module is installed through the opening on the mobile terminal shell, when the mushroom-head-shaped end is ready to pass through the opening, the size of the top area of the mushroom-head-shaped end is smaller than that of the opening, and the mushroom-head-shaped end can pass through the opening easily; the bottom area of the mushroom-head-shaped end is larger in size than the opening, and therefore the bottom area of the mushroom-head-shaped end needs to be deformed to pass through the opening.

When the top area and the bottom area of the mushroom-head-shaped end part sequentially pass through the opening, the area with the size larger than that of the opening in the mushroom-head-shaped end part is extruded, so that the mushroom-head-shaped end part is deformed, and the position of the mushroom-head-shaped end part, which is in contact with the opening, shrinks towards the middle, so that the limiting body generates a second shape.

When the mushroom head-shaped end passes through the opening, the external force is removed, and the end returns to the mushroom head shape. At this time, the size of the contact position of the end of the position limiting body and the opening is larger than that of the opening, so that the end of the position limiting body is clamped in the shell of the mobile terminal.

In the embodiment of the disclosure, the end part of the limiting body is designed to be mushroom-head-shaped, umbrella-shaped, circular truncated cone-shaped or conical in the first form, so that the assembly is simple, and the clamping relation between the end part of the limiting body and the shell of the mobile terminal can be more stable.

In an embodiment, when the key module 100 includes a plurality of position-limiting bodies 130, the position-limiting bodies 130 are symmetrically distributed at two ends of the second surface of the key sheet.

Referring to fig. 2, when the key module includes two position-limiting bodies, the two position-limiting bodies and the key body are located on the second surface of the key plate and symmetrically distributed on the second surface of the key plate.

In the disclosed example, a plurality of limiting bodies are symmetrically arranged on two sides of the key body, so that the assembly stability between the key module and the mobile terminal shell can be further improved.

In one embodiment, the end of the position-limiting body 130 is made of an insulator.

The key switch of the mobile terminal comprises a mechanical pressing type, and the pressing force of the user finger on the key is conducted by contacting the key module with the user finger, so that the conductive contact is conducted to realize the control of related functions or the state switching. For example, power-on control, power-off control, or volume adjustment of the mobile terminal, etc. for the mobile terminal. The key module is made of the same material (metal, plastic, etc.) as the battery cover of the mobile terminal, and is structurally matched with the battery cover tightly to realize the function.

According to the assembling mode of the key module, the key module can be divided into an internally-installed key module and an externally-installed key module. The built-in key module is assembled from the inner side and the outer side of the mobile terminal shell and then fixed by soft glue; the external key module is fixed on the inner side of the mobile terminal shell through limiting key bodies such as pins, steel sheets and plastic strips, and the clamping stability between the key module and the mobile terminal shell is guaranteed.

Fig. 4 shows a partial schematic view of a mobile terminal having a built-in key module. The built-in key module is mainly applied to a shell manufactured by adopting an integral forming process (Unibody). Referring to fig. 4, the mobile terminal includes: the keypad 110, the housing 310, the soft key body 320, the housing detent 330, the conductive contact 230, and the flexible circuit board (FPC) assembly 240.

As shown in fig. 4, before the key module is installed, a hole needs to be dug in the housing, and the shape of the hole is matched with the shape of the metal key body of the key module. Typically, the aperture is elongate in shape. After the holes are dug in the shell, the shell is easy to deform. In addition, when the key module is installed in a built-in mode, the Dome contact is easy to scrape, and the key function is damaged. Due to the fact that the Dome contact and the built-in key module are long in size chain length, idle stroke is easy to generate, when a user presses a key board, the Dome contact cannot be conducted, namely, the corresponding function of the key module cannot be normally triggered, and user experience is affected; or cause the problem of overvoltage Dome contact, damage the key module. In addition, the problem of uneven appearance of the mounted key module is easy to occur.

Fig. 5 to 7 are schematic views showing an installation flow of the mobile terminal using the exterior key module, respectively. Fig. 5 shows a schematic view of fixing the exterior key module using a plastic strip stopper structure. Fig. 6 shows a schematic view of fixing the exterior key module using a steel sheet stopper structure. Fig. 7 shows a schematic view of fixing the exterior key module using a pin stopper structure.

The adoption adorns the button module outward can save mobile terminal internal assembly stroke space, and not fragile Dome contact. However, the elastic wall (baffle) of the externally-mounted key module is separated from the keycap of the key, so that a virtual position of the key is easily generated, and therefore, when a user presses the keycap of the key, the Dome contact cannot be conducted, that is, the corresponding function of the key module cannot be normally triggered, and user experience is affected; or the problem of key overvoltage is generated, and the key module is damaged. And when adopting the mode installation button module of adorning outward, the baffle assembly is loaded down with trivial details, and the cost is higher.

As shown in fig. 8, in the related art, when the key module is mounted in an exterior manner, a numerical control lathe (CNC) technique is required, a hole 400 having a large size is formed in the middle frame of the mobile terminal corresponding to a position where the key is disposed, and the mobile terminal has a weak strength at the hole 400. When bending and pressing tests are performed, the hole 400 is prone to fracture and deformation, and the yield of the mobile terminal is reduced.

Fig. 9 is a block diagram illustrating a mobile terminal 200 according to an example embodiment. Referring to fig. 9, the mobile terminal includes:

a key module 100;

a first frame 210 having a first opening 211 and a second opening 212; the first opening 211 is used for installing the key body 120 of the key module 100; a second opening 212 for mounting the spacing body 130; wherein the second opening 212 is sized between the first size and the second size.

The mobile terminal may comprise a mobile or portable wireless communication terminal. Specifically, the mobile terminal may include: mobile phones, smart phones, portable gaming devices, portable multimedia players, laptops, personal digital assistants, portable internet devices, music players and data storage devices, wearable devices, printers, portable medical devices, and digital cameras, among others.

Fig. 10 shows a schematic flow chart of installing the key module of the present disclosure. Fig. 11 and 12 respectively show a partial schematic view of a mobile terminal of the present disclosure. Referring to fig. 12, the mobile terminal further includes a conductive contact 230, a flexible circuit board assembly 240.

When assembling above-mentioned button module, can adopt tools such as tweezers to make the tip of spacing body take place to deform, then pack the second opening into with the spacing body, the tip of spacing body resumes first form can the joint in first framework.

In the embodiment of the disclosure, the first frame body is provided with the first openings for installing the limiting bodies, and the size of the first openings is between the first size and the second size, so that the end parts of the limiting bodies can be reduced from the first size to the second size under the action of external force.

Compared with a built-in key module, the key module disclosed by the invention has the advantages that the size of the second opening in the first frame body is reduced without arranging the opening with the size larger than the first size in the first frame body, the strength of the first frame body at the position of the second opening is improved, the condition that the first frame body is broken and deformed at the position of the second opening can be reduced, and the yield of the mobile terminal is improved.

Compared with an externally-installed key module, the key module disclosed by the invention can be clamped between the key module and the first frame body of the mobile terminal without arranging a limiting support inside the mobile terminal, so that the number of parts and the assembly process are simplified, the manufacturing and assembling cost can be effectively saved, and the manufacturing efficiency is improved.

In one embodiment, as shown in fig. 11, the mobile terminal 200 further includes:

the second frame body 220 is positioned outside the first frame body and is provided with a through hole matched with the key board;

the key board covers on the through-hole, and the button body passes through-hole and first opening, and the spacing body passes through-hole and second opening.

In one embodiment, as shown in fig. 12, the first frame body 210 further includes:

the accommodating area is positioned on the inner side of the first frame body and is provided with a concave area 250 matched with the end part of the limiting body;

the end of the spacing body is located in the recessed area 250 so that the spacing body is clamped with the first frame body.

In the embodiment of the disclosure, the concave area matched with the end part of the limiting body is arranged on the inner side of the first frame body, so that the stability of clamping the end part of the limiting body and the first frame body can be further improved.

Fig. 13 is a block diagram illustrating an apparatus 800 according to an example embodiment. For example, the apparatus 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 13, the apparatus 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.

The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operation at the device 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power component 806 provides power to the various components of device 800. The power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 800.

The multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed state of the device 800, the relative positioning of the components, such as a display and keypad of the apparatus 800, the sensor assembly 814 may also detect a change in position of the apparatus 800 or a component of the apparatus 800, the presence or absence of user contact with the apparatus 800, orientation or acceleration/deceleration of the apparatus 800, and a change in temperature of the apparatus 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, communications component 816 further includes a Near Field Communications (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The key module is characterized in that the key module comprises:

a key sheet; the first surface of the key board is used for detecting key operation;

the key body is fixedly arranged on the second surface of the key plate; the key body can be used for interacting with a key signal generation module, and the second surface is the opposite surface of the first surface;

the limiting body is arranged on the second surface of the key board, and the end part of the limiting body is provided with a first shape and a second shape generated when external force acts; in the first form, the end of the spacing body has a first dimension, and in the second form, the end of the spacing body has a second dimension; wherein the second size is smaller than the first size.

2. The key module of claim 1, wherein the end of the retainer comprises:

an elastic member; wherein the elastic member switches from the first form to the second form when an external force acts thereon; the resilient member also returns from the second configuration to the first configuration upon removal of the external force.

3. The key module of claim 1, wherein the end of the retainer comprises:

at least one notch; wherein, in the first configuration, the notch has a third size; in the second state, the indentation has a fourth dimension; the fourth dimension is less than the third dimension.

4. The key module of claim 3, wherein the end of the retainer further comprises:

a movable portion and a body; wherein the gap is at least located between the movable portion and the body;

the movable part is used for moving towards a first preset direction under the action of external force so as to enable the end part of the limiting body to generate the second shape; the movable part is also used for moving towards a second preset direction after the action of the external force is cancelled so as to restore the end part of the limiting body from the second shape to the first shape; wherein the first preset direction is opposite to the second preset direction.

5. The key module of claim 1, wherein the shape of the end portion in the first configuration comprises at least one of:

mushroom head shape;

umbrella shape;

a circular truncated cone shape;

conical shape.

6. The key module of claim 1,

when the key module comprises a plurality of limiting bodies, the limiting bodies are symmetrically distributed at two ends of the second surface of the key board.

7. The key module of claim 1,

the end part of the limiting body is made of an insulator.

8. A mobile terminal, characterized in that the mobile terminal comprises:

the key module of any one of claims 1 to 7;

a first frame body having a first opening and a second opening; the first opening is used for installing a key body of the key module; the second opening is used for installing the limiting body; wherein the second opening has a size between the first size and the second size.

9. The mobile terminal of claim 8, wherein the mobile terminal further comprises:

the second frame body is positioned on the outer side of the first frame body and is provided with a through hole matched with the key board;

the key plate covers the through hole, the key body penetrates through the through hole and the first opening, and the limiting body penetrates through the through hole and the second opening.

10. The mobile terminal according to claim 9, wherein the first frame body further comprises:

the accommodating area is positioned on the inner side of the first frame body and is provided with a concave area matched with the end part of the limiting body;

the end part of the limiting body is positioned in the concave area, so that the limiting body is clamped with the first frame body.

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