CN115134439A

CN115134439A - Mobile terminal

Info

Publication number: CN115134439A
Application number: CN202110326884.XA
Authority: CN
Inventors: 温晓雷; 毛朝辉; 吴长火; 陈超; 王隐
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2022-09-30

Abstract

The disclosure provides a mobile terminal, and belongs to the field of mobile terminals. The mobile terminal comprises a flexible circuit board, side keys and a limiting piece; the flexible circuit board is provided with a first part, a second part and a bent part, wherein the first part is opposite to the second part, and the bent part is connected with the first part and the second part; the side key is positioned on one side of the first part, which is far away from the second part, and is connected with the first part; the limiting piece is provided with a protrusion, the protrusion is positioned on one side of the first part, which is far away from the second part, and is close to the bending part, and the protrusion is abutted against the first part under the state that the side key is bounced. The first part of the flexible circuit board can be propped against the bulge, so that the elastic force generated by the flexible circuit board acts on the bulge but not acts on the side edge key, and the side edge key is prevented from being inclined.

Description

Mobile terminal

Technical Field

The present disclosure relates to the field of mobile terminals, and more particularly, to a mobile terminal.

Background

Common fingerprint technologies of a mobile terminal include an under-screen fingerprint technology, a post-fingerprint technology, and a side-fingerprint technology. The under-screen fingerprint technology has requirements on the display screen type of the mobile terminal, and has great limitation. The integrity of the rear cover of the mobile terminal can be damaged by the rear fingerprint technology, and the use is inconvenient. The side fingerprint technology avoids the defects of the under-screen fingerprint technology and the post-fingerprint technology, and has good application prospect.

In the mobile terminal applying the side fingerprint technology, the side keys are structurally connected with a printed circuit board and the like inside the mobile terminal through a flexible circuit board. Because one part of the flexible circuit board is in a bent state, the elasticity of the bent part can push the side keys, so that the side keys are easy to be inclined.

Disclosure of Invention

The embodiment of the disclosure provides a mobile terminal, which can avoid the deflection of side keys of the mobile terminal. The technical scheme is as follows:

the embodiment of the disclosure provides a mobile terminal, which comprises a flexible circuit board, a side key and a limiting piece;

the flexible circuit board is provided with a first part, a second part and a bent part, wherein the first part is opposite to the second part, and the bent part is connected with the first part and the second part;

the side key is positioned on one side of the first part, which is far away from the second part, and is connected with the first part;

the limiting piece is provided with a protrusion, the protrusion is located on one side, far away from the second portion, of the first portion and close to the bent portion, and the protrusion abuts against the first portion in the state that the side key is bounced.

In a possible implementation manner of the embodiment of the present disclosure, in a state where the side key bounces, a surface of the protrusion close to the first portion is flush with a surface of the side key close to the first portion.

In one possible implementation of the embodiment of the present disclosure, the distance from the protrusion to both sides in the width direction of the first portion is equal.

In a possible implementation manner of the embodiment of the present disclosure, the first portion includes a flexible body and a reinforcing member, the reinforcing member is located on one side of the flexible body and connected to the flexible body, the reinforcing member is close to the protrusion, and the protrusion abuts against the reinforcing member.

In one possible implementation of the disclosed embodiment, the protrusion is formed by stamping.

Optionally, the mobile terminal further includes a middle frame, the middle frame has a receiving groove and a side key mounting hole, the receiving groove has a first sidewall and a second sidewall, the first sidewall is close to an outer side of the middle frame, the second sidewall is close to an inner side of the middle frame, and the side key mounting hole is located on the first sidewall;

the first part, the second part and the bent part are positioned in the accommodating groove, a gap is formed between the first part and the first side wall, and the second part is attached to the second side wall;

the side keys are movably inserted into the side key mounting holes, and part of the side keys are positioned in the accommodating grooves;

the locating part with the inside wall of holding tank pastes, the arch is located in the clearance.

In a possible implementation manner of the embodiment of the present disclosure, the side key has a limiting jack, and the limiting jack extends along a depth direction of the accommodating groove;

the limiting part is provided with a first attaching part, a second attaching part, a limiting part and a connecting part, the first attaching part is connected with one end of the connecting part, the second attaching part is connected with the other end of the connecting part, and the limiting part is positioned between the first attaching part and the second attaching part and is connected with the connecting part;

the first attaching portion and the second attaching portion are located on two opposite sides of the side key, the connecting portion is located on one side, away from the side key, of the groove bottom of the accommodating groove, and the limiting portion is inserted into the limiting insertion hole.

In a possible implementation manner of the embodiment of the disclosure, one end of the limiting portion, which is far away from the connecting portion, extends out of the limiting jack, and a portion of the limiting portion, which extends out of the limiting jack, is bent towards a direction far away from the first side wall.

Optionally, the position-limiting member further has a supporting portion, and the supporting portion is connected to the connecting portion and extends toward the second sidewall.

Optionally, the second side wall has a boss located on one side of the support portion near the bottom of the receiving groove, the boss contacting one surface of the support portion near the bottom of the receiving groove.

Optionally, there are two bosses, and the two bosses are distributed at intervals and both contact with the support part;

the supporting part is provided with a notch, and the notch is positioned between the two bosses.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

because the limiting piece is provided with a bulge, the bulge is positioned on one side of the first part of the flexible circuit board, which is far away from the second part, and is close to the bent part of the flexible circuit board, the first part of the flexible circuit board can be propped against the bulge, and the elastic force generated by the flexible circuit board acts on the bulge and does not act on the side keys, thereby preventing the side keys from being skewed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a middle frame of a mobile terminal in the related art;

fig. 2 is an exploded view of a mobile terminal in the related art;

fig. 3 is a partial structural diagram of a mobile terminal in the related art;

fig. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure;

fig. 5 is an exploded view of a mobile terminal according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating an assembly process of a mobile terminal according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an assembly process of a mobile terminal according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of an assembly of a side key and a flexible circuit board according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of an assembly process of the position limiting member, the side button and the flexible circuit board;

fig. 10 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the present disclosure;

fig. 11 is a schematic view illustrating a matching between a limiting member and a flexible circuit board according to an embodiment of the disclosure;

fig. 12 is a schematic structural diagram of a limiting element according to an embodiment of the disclosure;

fig. 13 is a schematic view illustrating a position limiting element and a side key according to an embodiment of the disclosure;

FIG. 14 is a cross-sectional view taken at I-I of FIG. 10;

fig. 15 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the present disclosure;

fig. 16 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item appearing in front of the word "comprising" or "comprises" includes the element or item listed after the word "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

The middle frame 10 is a part of a housing of the mobile terminal. Taking a mobile phone as an example, the middle frame 10 forms a sidewall of the mobile phone, and the middle frame 10 has some through holes for installing corresponding structures, such as a volume key, a power key, a charging interface, and the like. Fig. 1 is a schematic structural diagram of a middle frame of a mobile terminal in the related art. As shown in fig. 1, the middle frame 10 has a receiving groove 101 and a side key mounting hole 102, the receiving groove 101 has a first side wall 101a and a second side wall 101b, and the side key mounting hole 102 is located on the first side wall 101 a.

A mobile terminal employing a side fingerprint technique in the related art includes a middle frame 10 shown in fig. 1. Fig. 2 is an exploded view of a mobile terminal in the related art. Fig. 2 shows a structure in the vicinity of the accommodation groove 101 of the middle frame 10. As shown in fig. 2, the mobile terminal further includes a side key 20, a flexible circuit board 30 and a stopper 40. Fig. 3 is a partial structural diagram of a mobile terminal in the related art. The left drawing in fig. 3 is a state before the limiting member 40 is mounted to the receiving groove 101, and the right drawing in fig. 3 is a state after the limiting member 40 is mounted to the receiving groove 101.

The side key 20 is inserted into the side key mounting hole 102, and a portion thereof extends into the receiving groove 101. The flexible circuit board 30 is partially disposed in the receiving groove 101, partially disposed outside the receiving groove 101, and the portion disposed in the receiving groove 101 is connected to the side key 20, and the portion disposed outside the receiving groove 101 is configured to be connected to a printed circuit board inside the mobile terminal.

The side keys 20 have a fingerprint module integrated therein. When the side key 20 is pressed, the side key 20 triggers the switch device 50 located in the receiving cavity 101. This switching device 50 is used for controlling the fingerprint module, and when switching device 50 was triggered, fingerprint module work, side button 20 when playing, fingerprint module stop work. The position-limiting element 40 is used to cooperate with the portion of the side key 20 extending into the receiving groove 101 to limit the displacement range of the side key 20 and prevent the side key 20 from falling off from the side key mounting hole 102.

As shown in the dashed line frame of fig. 3, in the receiving groove 101, the flexible circuit board 30 is bent into a U shape, having a first portion 31, a second portion 32 and a bent portion 33, which causes the flexible circuit board 30 to apply a force to the side key 20, the force pushing out the portion of the side key 20 close to the bent area of the flexible circuit board 30 in the direction of the arrow, resulting in the side key 20 being skewed.

Fig. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure. The mobile terminal can be, but is not limited to, a mobile phone or a tablet computer. Taking a mobile phone as an example in the embodiment of the present disclosure, as shown in fig. 4, the mobile terminal includes a side key 20, a flexible circuit board 30 and a limiting member 40.

Fig. 5 is an exploded schematic structure diagram of a mobile terminal according to an embodiment of the present disclosure. The side key 20, the flexible circuit board 30 and the stopper 40 are all located in the middle frame 10 of the mobile terminal. A portion of the middle frame 10 at the rectangular frame in fig. 4 is shown in fig. 5. As shown in fig. 5, the middle frame 10 has a receiving groove 101 and a side key mounting hole 102. The receiving groove 101 has a first sidewall 101a and a second sidewall 101b, the first sidewall 101a is near the outer side of the middle frame 10, the second sidewall 101b is near the inner side of the middle frame 10, and the side key mounting hole 102 is located on the first sidewall 101 a. Fig. 6 and 7 are schematic views illustrating an assembly process of a mobile terminal according to an embodiment of the present disclosure, in which fig. 6 illustrates a state in which the flexible circuit board 30 is mounted on the middle frame 10, and fig. 7 illustrates a state in which the middle frame 10, the side key 20, the flexible circuit board 30, and the stopper 40 are assembled. As shown in fig. 7, the side key 20 is movably inserted into the side key mounting hole 102, and the position-limiting member 40 is located in the receiving groove 101 and attached to the inner wall of the receiving groove 101. The limiting member 40 is configured to cooperate with the side button 20 to limit a displacement range of the side button 20 in the pressing direction. Fig. 8 is a schematic view illustrating an assembly of a side key and a flexible circuit board according to an embodiment of the disclosure. In fig. 8, in order to show the relationship between the side key 20 and the receiving groove 101 and the relationship between the flexible circuit board 30 and the receiving groove 101, the first side wall 101a and the second side wall 101b of the receiving groove 101 are shown by dotted lines. As shown in fig. 8, the flexible circuit board 30 has a first portion 31, a second portion 32, and a bent portion 33, and the first portion 31, the second portion 32, and the bent portion 33 are located in the receiving groove 101. The first portion 31 of the flexible circuit board 30 has a gap a with the first sidewall 101a, and the second portion 32 is attached to the second sidewall 101 b. The flexible circuit board 30 further has a third portion 34, the third portion 34 is connected to the second portion 32, the third portion 34 is located outside the receiving groove 101, and the third portion 34 is used for connecting with other devices in the mobile terminal, such as a printed circuit board.

The first portion 31 and the second portion 32 of the flexible circuit board 30 are opposed, and the bent portion 33 is connected to the first portion 31 and the second portion 32. The side key 20 is located on a side of the first portion 31 away from the second portion 32, and is connected to the first portion 31, and the side key 20 is partially located in the receiving groove 101.

Fig. 9 is a schematic view of an assembly process of the position limiting member, the side key and the flexible circuit board. As shown in fig. 9, the position-limiting member 40 has a protrusion 401, and the protrusion 401 is located on a side of the first portion 31 away from the second portion 32 and close to the bent portion 33. Fig. 10 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the present disclosure. In order to show the engagement of the protrusion 401 with the flexible circuit board 30, the protrusion 401 of the position limiting member 40 is shown in dotted lines in fig. 10. As shown in fig. 10, in the state where the side key 20 is sprung up, the protrusion 401 abuts against the first portion 31 of the flexible circuit board 30.

The first portion 31 of the flexible circuit board 30 is attached to a surface of the side key 20 close to the second sidewall 101b of the receiving groove 101, and the bent portion 33 of the flexible circuit board 30 is bent toward the second sidewall 101b of the receiving groove 101, so that the first portion 31, the second portion 32 and the bent portion 33 form a U-shaped structure. The protrusion 401 of the position-limiting element 40 abuts against the first portion 31 at a position close to the bent portion 33, and the elastic force generated by the bent portion 33 of the flexible circuit board 30 directly acts on the protrusion 401 without affecting the side key 20.

One side of the side key 20 close to the second side wall 101b of the accommodating groove 101 has a protruding nail 201, the first portion 31 of the flexible circuit board 30 has a positioning hole 30a, and the protruding nail 201 is inserted into the positioning hole 30a to limit the flexible circuit board 30 and prevent the flexible circuit board 30 from loosening.

As shown in fig. 10, an elastic pad 60 is connected to a surface of the first portion 31 of the flexible circuit board 30 away from the side key 20, and the elastic pad 60 can provide an elastic force for resetting the side key 20. When the edge key 20 is pressed, the elastic pad 60 contacts with the second sidewall 101b of the receiving groove 101, and is pressed and deformed, and when the edge key 20 is released, the elastic pad 60 is restored, thereby pushing the edge key 20 to bounce.

Illustratively, the material of the elastic pad 60 is at least one of rubber, foam, and aerogel.

As shown in fig. 10, the first portion 31 of the flexible circuit board 30 includes a flexible body 301 and a reinforcing member 302. The reinforcing member 302 is disposed on one side of the flexible body 301 and connected to the flexible body 301. The stiffener 302 is adjacent to the protrusion 401, and the protrusion 401 abuts against the stiffener 302.

The flexible body 301 is relatively flexible, and the reinforcing member 302 is used to increase the strength of the flexible circuit board 30 locally. The protrusion 401 abuts on the reinforcing member 302 to prevent the protrusion 401 from causing local deformation of the flexible circuit board 30, such as ejecting a pit on the surface of the flexible circuit board 30.

As shown in fig. 10, in the state where the side key 20 is sprung up, the surface of the protrusion 401 near the first portion 31 is flush with the surface 20a of the side key 20 near the first portion 31.

The first portion 31 of the flexible circuit board 30 is connected to the side button 20, and abuts against the protrusion 401 when the side button 20 is in the sprung state, and the first portion 31 of the flexible circuit board 30 is parallel to the first sidewall 101a of the receiving groove 101 and is just perpendicular to the pressing direction of the side button 20, so that the side button 20 is kept stable. If the protrusion 401 is too protruded, the first portion 31 of the flexible circuit board 30 may be inclined, and the side key 20 may be pulled toward the second sidewall 101b of the receiving groove 101, and the upper end of the side key 20 in fig. 10 may be pulled toward the second sidewall 101b of the receiving groove 101, so that the side key 20 may be inclined, and therefore, the surface of the protrusion 401 close to the second sidewall 101b of the receiving groove 101 may be flush with the surface of the side key 20 close to the second sidewall 101b in the state that the side key 20 is bounced, and the stability of the side key 20 may be further improved.

Fig. 11 is a schematic view illustrating a matching between a limiting member and a flexible circuit board according to an embodiment of the disclosure. Fig. 11 corresponds to the left side view in fig. 10. As shown in fig. 11, the projections 401 are equidistant from both sides in the width direction of the first portion 31. I.e., the distance d from the protrusion 401 to the side of the first portion 31 near the bottom of the receiving groove 101 ₁ A distance d from the projection 401 to a side of the first portion 31 away from the bottom of the receiving groove 101 ₂ And are equal. The force of the protrusion 401 on the flexible circuit board 30 acts on the middle position of the flexible circuit board 30, which is the middle position in the depth direction of the accommodating groove 101, so that the flexible circuit board 30 can be prevented from being twisted and deformed. For example, if the protrusion 401 is closer to the side of the first portion 31 away from the bottom of the receiving groove 101, the distance d is set ₂ Less than distance d ₁ After the protrusion 401 abuts against the first portion 31 of the flexible circuit board 30, the first portion 31 of the flexible circuit board 30 is torsionally deformed by the elasticity of the flexible circuit board 30, and the side edge of the first portion 31 close to the bottom of the accommodating groove 101 is closer to the first side wall 101a of the accommodating groove 101.

Referring to fig. 10, the side key 20 has a limiting insertion hole 20b, and the limiting insertion hole 20b extends along the depth direction of the receiving groove 101. The position limiting insertion hole 20b is partially located in the receiving groove 101 and partially located in the side key installation hole 102. As the side key 20 is pressed, a portion of the limiting insertion hole 20b located in the side key installation hole 102 gradually enters into the receiving groove 101. The limiting insertion hole 20b is used for being matched with the limiting piece 40 to limit the displacement range of the side key 20 and prevent the side key 20 from falling off from the side key mounting hole 102.

As an example, in the embodiment of the present disclosure, the side key 20 has two position-limiting insertion holes 20b, and the two position-limiting insertion holes 20b are respectively matched with the position-limiting members 40.

Fig. 12 is a schematic structural diagram of a limiting member according to an embodiment of the disclosure. As shown in fig. 12, the stopper 40 includes a first bonded portion 41, a second bonded portion 42, a stopper portion 43, and a connecting portion 44. The first attaching portion 41 is connected to one end of the connecting portion 44, and the second attaching portion 42 is connected to the other end of the connecting portion 44. The stopper 43 is located between the first attaching portion 41 and the second attaching portion 42, and is connected to the connecting portion 44.

The first attaching portion 41 of the limiting member 40 is U-shaped, one portion is attached to the first sidewall 101a of the accommodating groove 101, the other portion is attached to the second sidewall 101b of the accommodating groove 101, the first attaching portion 41 is close to the bending portion 33 of the flexible circuit board 30, and the protrusion 401 is located at the first attaching portion 41. The second attaching portion 42 of the limiting member 40 is also U-shaped, and a portion of the second attaching portion is attached to the first sidewall 101a of the accommodating groove 101, and another portion of the second attaching portion is attached to the second sidewall 101b of the accommodating groove 101. The two attaching portions are bent to form a U shape, have certain elasticity, and can be attached to the first side wall 101a and the second side wall 101b of the accommodating groove 101, so that the limiting member 40 is kept stable.

Fig. 13 is a schematic view illustrating a matching between a position limiting element and a side key according to an embodiment of the disclosure. As shown in fig. 13, the first attaching portion 41 and the second attaching portion 42 are located on opposite sides of the side key 20. The connecting portion 44 is located on a side of the side key 20 away from the groove bottom of the accommodating groove 101, and the limiting portion 43 is inserted into the limiting insertion hole 20 b.

When the side key 20 is in the bounce state, the inner wall of the limiting jack 20b is attached to one surface of the limiting part 43 close to the second side wall 101b of the accommodating groove 101, and under the matching of the limiting jack 20b and the limiting part 43, the maximum displacement of the side key 20 bouncing towards the outside of the side key mounting hole 102 is limited, and the side key 20 is prevented from being separated from the side key mounting hole 102.

Exemplarily, in the embodiment of the present disclosure, the limiting member 40 has two limiting portions 43, the two limiting portions 43 correspond to the two limiting insertion holes 20b one by one, and the two limiting portions 43 and the two limiting insertion holes 20b are respectively matched to make the side key 20 more stable.

Fig. 14 is a cross-sectional view taken at i-i of fig. 10. Also shown in fig. 14 is a stop 40. As shown in fig. 14, an end of the limiting portion 43 of the limiting member 40 away from the connecting portion 44 extends out of the limiting insertion hole 20b, and a portion of the limiting portion 43 extending out of the limiting insertion hole 20b is bent in a direction away from the first sidewall 101a of the accommodating groove 101.

When the limiting member 40 is mounted, the limiting member 40 is placed into the receiving groove 101 in the depth direction of the receiving groove 101. The position-limiting portion 43 of the position-limiting member 40 firstly slides to the bottom of the receiving slot 101 along the first sidewall 101a of the receiving slot 101, and then continues to slide to the bottom of the receiving slot 101 along the first sidewall 101a of the receiving slot 101 after the position-limiting portion 43 passes through the position-limiting insertion hole 20b of the side key 20. During the installation process, if the limiting member 40 is slightly inclined, the limiting portion 43 may extend into the side key installation hole 102 after passing through the side key 20, so that the limiting portion 43 may be deformed by pushing against the inner sidewall of the side key installation hole 102, which may affect the normal installation of the limiting member 40. The portion of the limiting portion 43 extending out of the limiting insertion hole 20b is bent, so that the possibility that the limiting portion 43 extends into the side key installation hole 102 can be reduced, and the limiting member 40 can be conveniently installed.

As shown in fig. 14, an end of the limiting part 43 away from the connecting part 44 abuts against a groove bottom of the accommodating groove 101, so that the limiting part 40 is limited in the depth direction of the accommodating groove 101 by the limiting part 43, and the limiting part 40 is more smoothly mounted in the accommodating groove 101.

Optionally, the limiting member 40 is a stamping member, integrally formed by stamping, suitable for mass production, low in cost and high in production efficiency. The projection 401 is formed by punching. When the stopper 40 is punched, a recess is punched in a portion where the first attaching portion 41 is connected to the connecting portion 44, so that a protrusion 401 is formed on the other surface.

Illustratively, a steel sheet is stamped to produce the stop 40. The steel sheet has higher intensity and toughness, and first laminating portion 41 and second laminating portion 42 can produce great elasticity and paste the inner wall of tight holding tank 101, avoid locating part 40 not hard up.

As shown in fig. 14, the stopper 40 further has a support portion 45. The support portion 45 is connected to the connection portion 44 and extends toward the second side wall 101 b.

Fig. 15 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the present disclosure. As shown in fig. 15, the housing groove 101 is generally sealed with a gasket 70 when the mobile terminal is assembled. After sealing, the surface of the gasket 70 is flush with the outer surface of the center frame 10. In the related art, the gasket 70 is easily sunk into the receiving groove 101 by the external force due to the lack of support of the gasket 70 in the receiving groove 101, and if the gasket 70 sunk into the receiving groove 101 is caught between the side button 20 and the second sidewall 101b of the receiving groove 101, the normal pressing of the side button 20 is affected. In the embodiment of the disclosure, the supporting portion 45 of the limiting member 40 can support the gasket 70 to be mounted subsequently, so as to prevent the gasket 70 from sinking into the accommodating groove 101, and prevent the gasket 70 from being jammed between the side key 20 and the second side wall 101b of the accommodating groove 101.

Illustratively, the seal 70 is a silicone seal.

Fig. 16 is a schematic partial structure diagram of a mobile terminal according to an embodiment of the disclosure, and the limiting element 40 is omitted in fig. 16. As shown in fig. 16, the second side wall 101b of the receiving groove 101 has a boss 1011. Referring to fig. 13, the boss 1011 is located on the side of the support portion 45 close to the bottom of the receiving groove 101, and the boss 1011 contacts the surface of the support portion 45 close to the bottom of the receiving groove 101.

The boss 1011 of the second sidewall 101b of the receiving groove 101 supports the end of the supporting portion 45 away from the connecting portion 44, so that the installation of the limiting member 40 is more stable, and the limiting member 40 is prevented from being inclined when the sealing gasket 70 is pressed by an external force.

In addition, the boss 1011 serves to contact the elastic pad 60. The elastic pad 60 on the flexible circuit board 30 faces the boss 1011, and when the side key 20 is pressed, the elastic pad 60 deforms after contacting the boss 1011. The projection 1011 also limits the maximum displacement of the side key 20 when it is depressed. When the side key 20 is pressed, the side key 20 may be pressed only until the first portion 31 of the flexible circuit board 30 comes into contact with the boss 1011 even if the thickness of the elastic pad 60 that is pressed to be deformed is ignored.

As shown in fig. 16, there are two bosses 1011, and the two bosses 1011 are spaced apart and are in contact with the support portion 45. The support is provided by two spaced bosses 1011 to make the support 45 more stable.

Correspondingly, two elastic pads 60 are correspondingly connected to the flexible circuit board 30, and the two elastic pads 60 correspond to the two bosses 1011 one by one.

As shown in fig. 15, the support portion 45 has a notch 45a, and the notch 45a is located between the two bosses 1011. When assembling the mobile terminal, the other components in the housing tank 101 are usually mounted, and then the stopper 40 is mounted, and finally the gasket 70 is mounted. When the limiting member 40 is installed, the side button 20 generally needs to be pressed, so that the limiting portion 43 of the limiting member 40 can be conveniently inserted into the limiting insertion hole 20b of the side button 20, and after the limiting member 40 is installed in place, the side button 20 is released, and the gap 45a can be used for observing the components between the side button 20 and the second side wall 101b of the accommodating groove 101, so as to ensure that the assembly relationship between the components meets the design requirement.

As shown in fig. 16, the accommodating groove 101 further accommodates the switching device 50 therein, and the switching device 50 is located on the surface of the first portion 31 of the flexible circuit board 30 close to the second side wall 101 b. In the process of pressing the side key 20, the switch device 50 gradually approaches the second sidewall 101b of the accommodating groove 101 under the action of the side key 20, and after contacting the second sidewall 101b of the accommodating groove 101, the switch device 50 is pressed to be triggered, when the side key 20 is released, the side key 20 rebounds, the switch device 50 is separated from the second sidewall 101b of the accommodating groove 101, and the switch device 50 is turned off. In order to accurately trigger the switch device 50 when the side key 20 is pressed, and not to damage the switch device 50 due to excessive pressure, a gap between the switch device 50 and the second sidewall 101b of the accommodating groove 101 needs to satisfy a certain design requirement when the side key 20 is in the bounce state. The gap 45a on the supporting portion 45 can be easily observed to be the size of the gap between the switch device 50 and the second sidewall 101b of the accommodating groove 101 when the side key 20 is in the bounced state.

Optionally, a flexible gasket 80 is connected to the second side wall 101b of the receiving groove 101. When the switching device 50 is in direct contact with the second side wall 101b of the accommodating groove 101, the material of the middle frame 10 is hard, which may damage the switching device 50. Through setting up flexible gasket 80, when pressing side button 20, switching device 50 passes through flexible gasket 80 and indirect and the contact of the second lateral wall 101b of holding tank 101, and direct contact not, and flexible gasket 80 plays the effect of buffering to can reduce the impaired possibility of switching device 50, be favorable to prolonging switching device 50's life. After the flexible pad 80 is disposed, the gap 45a on the supporting portion 45 can facilitate observation of the size of the gap between the switch device 50 and the flexible pad 80 in the state that the side key 20 is bounced.

Illustratively, the flexible gasket 80 is made of a thermoplastic polyurethane elastomer rubber.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A mobile terminal is characterized by comprising a flexible circuit board (30), a side key (20) and a limiting piece (40);

the flexible circuit board (30) is provided with a first part (31), a second part (32) and a bent part (33), wherein the first part (31) is opposite to the second part (32), and the bent part (33) is connected with the first part (31) and the second part (32);

the side key (20) is positioned on one side of the first part (31) far away from the second part (32) and is connected with the first part (31);

the limiting piece (40) is provided with a protrusion (401), the protrusion (401) is located on one side, away from the second portion (32), of the first portion (31) and close to the bent portion (33), and the protrusion (401) abuts against the first portion (31) in the state that the side key (20) is bounced.

2. A mobile terminal according to claim 1, characterized in that in the sprung state of the side key (20), the surface of the protrusion (401) adjacent to the first portion (31) is flush with the surface of the side key (20) adjacent to the first portion (31).

3. A mobile terminal according to claim 1, characterized in that the distance of the projection (401) to both sides in the width direction of the first portion (31) is equal.

4. A mobile terminal according to claim 1, wherein the first portion (31) comprises a flexible body (301) and a reinforcement (302), the reinforcement (302) being located on one side of the flexible body (301) and being connected to the flexible body (301), the reinforcement (302) being located close to the protrusion (401), the protrusion (401) being located against the reinforcement (302).

5. A mobile terminal according to any of claims 1 to 4, wherein the protrusion (401) is formed by stamping.

6. The mobile terminal according to any one of claims 1 to 4, further comprising a middle frame (10), wherein the middle frame (10) has a receiving groove (101) and a side key mounting hole (102), the receiving groove (101) has a first side wall (101a) and a second side wall (101b), the first side wall (101a) is close to the outer side of the middle frame (10), the second side wall (101b) is close to the inner side of the middle frame (10), and the side key mounting hole (102) is located on the first side wall (101 a);

the first part (31), the second part (32) and the bent part (33) are positioned in the accommodating groove (101), the first part (31) has a gap (A) with the first side wall (101a), and the second part (32) is attached to the second side wall (101 b);

the side keys (20) are movably inserted into the side key mounting holes (102) and are partially positioned in the accommodating grooves (101);

the limiting piece (40) is attached to the inner side wall of the accommodating groove (101), and the protrusion (401) is located in the gap (A).

7. The mobile terminal according to claim 6, wherein the side key (20) has a position limiting insertion hole (20b), and the position limiting insertion hole (20b) extends along a depth direction of the receiving groove (101);

the limiting piece (40) is provided with a first attaching portion (41), a second attaching portion (42), a limiting portion (43) and a connecting portion (44), the first attaching portion (41) is connected with one end of the connecting portion (44), the second attaching portion (42) is connected with the other end of the connecting portion (44), and the limiting portion (43) is located between the first attaching portion (41) and the second attaching portion (42) and connected with the connecting portion (44);

first laminating portion (41) with second laminating portion (42) are located the opposite both sides of side button (20), connecting portion (44) are located side button (20) keep away from one side of the tank bottom of holding tank (101), spacing portion (43) are inserted and are established in spacing jack (20 b).

8. The mobile terminal according to claim 7, wherein an end of the position-limiting portion (43) away from the connecting portion (44) extends out of the position-limiting insertion hole (20b), and a portion of the position-limiting portion (43) extending out of the position-limiting insertion hole (20b) is bent away from the first side wall (101 a).

9. The mobile terminal according to claim 7, wherein the stopper (40) further has a support portion (45), and the support portion (45) is connected to the connecting portion (44) and extends toward the second sidewall (101 b).

10. The mobile terminal of claim 9, wherein the second side wall (101b) has a boss (1011), the boss (1011) being located on a side of the support (45) near the bottom of the receiving groove (101), the boss (1011) being in contact with a face of the support (45) near the bottom of the receiving groove (101).

11. The mobile terminal of claim 10, wherein there are two of the bosses (1011), and the two bosses (1011) are spaced apart and are in contact with the support portion (45);

the support part (45) is provided with a notch (45a), and the notch (45a) is positioned between the two bosses (1011).