CN209882186U - Mobile terminal and circuit board assembly thereof - Google Patents

Abstract

The utility model provides a mobile terminal and circuit board assembly thereof, circuit board assembly include circuit board, ground connection base, lock screw and ground connection piece. The ground connection piece includes conduction portion and transition portion, and conduction portion arranges between circuit board and ground connection base, and the outside at the lock screw double-screw bolt is established to the transition portion cover, and the one end of transition portion is fixed in conduction portion, and the other end extends and the top supports the nut of lock screw along the mounting hole direction of circuit board. Static electricity on the circuit board can be directly guided to the grounding base through the conduction part, can also be guided to the transition part through the conduction part, then is guided to the locking screw through the transition part, and is guided to the grounding base through the locking screw. The circuit board assembly can lead static electricity on the circuit board to the grounding base in time through the two static electricity conducting paths so as to eliminate static electricity interference on the circuit board, so that the mobile terminal can meet the requirements of lightness and thinness and antenna clearance, and meanwhile, the circuit board can be prevented from being interfered by the static electricity, and the integral service performance of the mobile terminal is ensured.

Description

Mobile terminal and circuit board assembly thereof

Technical Field

The utility model relates to an electronic equipment field, in particular to mobile terminal and circuit board assembly thereof.

Background

At present, mobile terminal devices such as mobile phones and the like all comprise various metal components so as to realize different functions of the terminal devices. Metal components and parts receive electrostatic interference easily, in order to prevent the inside electrostatic interference metal components and parts of cell-phone, can be connected to ground connection part through ground conductor with metal components and parts usually on to transmit metal components and parts's static to ground connection part, eliminate electrostatic interference.

However, when the mobile terminal needs to meet the requirements of thickness reduction and internal antenna clearance, the traditional grounding conductor cannot eliminate electrostatic interference on the metal component in time, so that the grounding reliability of the metal component is deteriorated, and the use performance of the mobile terminal is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve prior art mobile terminal, ground conductor's ground connection reliability is relatively poor, can't in time eliminate the interference of static on the metal components and parts, influences the problem of mobile terminal performance.

In order to solve the above technical problem, the present invention provides a circuit board assembly, which includes a circuit board, a ground base, a locking screw and a ground member, wherein mounting holes are formed at corresponding positions of the circuit board and the ground base, and the locking screw is inserted into the mounting holes to fix the circuit board and the ground base; the grounding piece comprises a conducting part and a transition part, the conducting part is arranged between the circuit board and the grounding base, and the conducting part is provided with a through hole for the lock screw to pass through; the transition part is sleeved outside the stud of the lock screw, one end of the transition part is fixed on the conduction part, and the other end of the transition part extends along the direction of the mounting hole of the circuit board and abuts against the nut of the lock screw so as to conduct the static electricity of the circuit board to the grounding base.

The utility model also provides a mobile terminal, including casing and foretell circuit board subassembly, circuit board subassembly sets up the inside of casing.

According to the above technical scheme, the beneficial effects of the utility model are that:

the utility model discloses an among mobile terminal and circuit board assembly thereof, static on the circuit board can be through conduction portion direct guide to the ground connection base on, also can be guided to transition portion by conduction portion, again by transition portion conduction to lock screw to guide to the ground connection base on through locking the screw. The circuit board assembly can lead static electricity on the circuit board to the grounding base in time through the two static electricity conducting paths so as to eliminate static electricity interference on the circuit board, so that the mobile terminal can meet the requirements of lightness and thinness and internal antenna clearance, meanwhile, the circuit board can be prevented from being interfered by the static electricity, the normal use of the circuit board assembly is ensured, and the integral use performance of the mobile terminal is effectively ensured.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the mobile terminal of the present invention;

fig. 2 is a schematic structural diagram of a circuit board assembly in the mobile terminal shown in fig. 1;

fig. 3 is a schematic structural view of a ground member in the circuit board assembly shown in fig. 2.

The reference numerals are explained below: 100. a mobile terminal; 10. a housing; 20. a circuit board assembly; 21. a circuit board; 21a, a first plate surface; 21b, a second plate surface; 22. a ground base; 22a, a metal part; 22b, a plastic part; 221. an accommodating groove; 23. a locking screw; 231. a stud; 232. a nut; 24. a ground member; 241. a conduction part; 2411. a via hole; 242. a transition section; 2421. a butt cap; 2422. a connecting arm; 2422a, a straight section; 2422b, bending sections; 25. mounting holes; 26. an extension member; 261. a connecting hole 30, a sound cavity component; 31. a sound cavity support; 311. and (7) assembling holes.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

The mobile terminal related to the embodiment of the present application may be any device having communication and storage functions, such as: the system comprises intelligent electronic equipment such as a mobile phone, a tablet computer, a notebook computer, an electronic reader, a remote controller, vehicle-mounted equipment, wearable equipment, a network television, a pedometer and the like.

Referring to fig. 1 and 2, an embodiment of the present application provides a mobile terminal 100, where the mobile terminal 100 includes a housing 10 and a circuit board assembly 20, where the circuit board assembly 20 is disposed inside the housing 10.

The circuit board assembly 20 of the present embodiment includes a circuit board 21, a ground base 22, a lock screw 23, and a ground member 24. Wherein, the corresponding position of circuit board 21 and ground base 22 all is equipped with mounting hole 25, and lock screw 23 wears to locate mounting hole 25 to it is fixed with ground base 22 to make circuit board 21.

The ground member 24 includes a conductive portion 241 and a transition portion 242, the conductive portion 241 is disposed between the circuit board 21 and the ground base 22, and the conductive portion 241 is opened with a through hole 2411 for passing the locking screw 23. The transition portion 242 is disposed outside the stud 231 of the lock screw 23, one end of the transition portion 242 is fixed to the conductive portion 241, and the other end of the transition portion extends along the mounting hole 25 of the circuit board 21 and abuts against the nut 232 of the lock screw 23, so as to transmit the static electricity of the circuit board 21 to the ground base 22.

Further, the circuit board assembly 20 may be disposed on the top of the housing 10, and may also be disposed on the bottom of the housing 10. In the present embodiment, the circuit board assembly 20 is disposed at the bottom of the housing 10 and is disposed adjacent to the sound chamber assembly 30 of the mobile terminal 100.

The circuit board 21 of the present embodiment is disposed between the sound cavity assembly 30 and the ground base 22, and the circuit board 21 has a first plate surface 21a and a second plate surface 21b facing away from each other. The first plate 21a faces the sound cavity assembly 30 of the mobile terminal 100, and the second plate 21b faces the ground base 22.

In the mobile terminal 100, the sound chamber assembly 30 includes a sound chamber holder 31, and the sound chamber holder 31 is provided with a fitting hole 311 at a position corresponding to the mounting hole 25 on the circuit board 21. The lock screw 23 is inserted into the mounting hole 311 and the mounting holes 25 of the circuit board 21 and the ground base 22, and the nut 232 of the lock screw 23 abuts against the surface of the sound cavity bracket 31, so that the sound cavity bracket 31 is fixed to the first plate surface 21a of the circuit board 21, and the circuit board 21 and the ground base 22 are fixed.

Further, the ground base 22 of the present embodiment may be a motherboard cover or a middle frame of the mobile terminal 100. Referring to fig. 2, a receiving groove 221 is concavely formed on the surface of the ground base 22 facing the circuit board 21, and the receiving groove 221 is used for receiving the conducting portion 241 of the grounding piece 24.

In the present embodiment, the shape of the receiving groove 221 is matched with the shape of the conducting portion 241, and the depth of the receiving groove 221 is consistent with the thickness of the conducting portion 241. This arrangement enables the circuit board 21, the ground base 22 and the ground element 24 to be arranged more compactly, so as to avoid occupying too much space inside the mobile terminal 100, which is beneficial for the light and thin design of the mobile terminal 100.

In order to avoid metal from affecting signals of the internal antenna of the mobile terminal 100, the ground base 22 may be configured to include a metal portion 22a and a plastic portion 22 b. In the mobile terminal 100, the antenna is disposed on one side of the plastic part 22b of the ground base 22, so that the requirement of the mobile terminal 100 for size such as being thinner and smaller can be ensured, the requirement of antenna clearance can be satisfied, and the antenna signal can be prevented from being interfered by metal, thereby ensuring the normal communication function of the mobile terminal 100.

In the prior art, a grounding elastic sheet is usually disposed between the metal portion 22a of the grounding base 22 and the circuit board 21, and the grounding elastic sheet is fixed on the surface of the circuit board 21 facing the grounding base 22, and the surface of the grounding elastic sheet is in contact with the metal portion 22a of the grounding base 22 to conduct the static electricity of the circuit board 21 to the grounding base 22.

Although the grounding elastic sheet can conduct between the circuit board 21 and the grounding base 22, the grounding reliability is poor, and for the area of the circuit board 21 corresponding to the plastic part 22b of the grounding base 22, the existing grounding elastic sheet cannot lead out static electricity in time, so that a part of the area of the circuit board 21 generates static electricity accumulation, thereby affecting the use performance of the mobile terminal 100.

The grounding member 24 of the present embodiment is a metal member, which can timely conduct the static electricity on the circuit board 21 out and conduct the static electricity to the grounding base 22, so as to improve the grounding reliability of the circuit board 21, and ensure that the mobile terminal 100 can be effectively and normally used.

Referring to fig. 2 and 3, the ground element 24 includes a conductive portion 241 and a transition portion 242. The conducting portion 241 is disposed between the circuit board 21 and the ground base 22, and the transition portion 242 is sleeved outside the stud 231 of the locking screw 23. The transition portion 242 has one end fixed to the ground base 22 and the other end abutting against the nut 232 of the lock screw 23.

Specifically, the conductive portion 241 of the present embodiment is an annular plate structure, and a circular through hole 2411 is opened on the conductive portion 241 for the lock screw 23 to pass through. When the conductive portion 241 is disposed between the circuit board 21 and the ground base 22, surfaces of both sides of the conductive portion 241 are respectively in contact with the second plate surface 21b of the circuit board 21 and the surface of the ground base 22.

When the surface of the conducting part 241 is in contact with the metal part 22a of the ground base 22, the static electricity on the circuit board 21 can be directly guided to the metal part 22a of the ground base 22 through the conducting part 241 to form a direct static electricity conducting path, so that the static electricity accumulated on the circuit board 21 is eliminated. When the surface of the conducting portion 241 contacts the plastic portion 22b of the ground base 22, the static electricity on the circuit board 21 is guided to the transition portion 242 from the conducting portion 241, then is guided to the locking screw 23 from the transition portion 242, and finally is guided to the ground base 22 from the locking screw 23, thereby forming an indirect conducting path for static electricity.

The grounding member 24 of the embodiment can guide the static electricity on the circuit board 21 to the grounding base 22 in time through the combination of the direct static electricity conducting path and the indirect static electricity conducting path, so as to eliminate the static electricity interference on the circuit board 21, thereby enabling the mobile terminal 100 to meet the requirements of lightness, thinness and internal antenna clearance, avoiding the interference of the static electricity on the circuit board 21, ensuring the normal use of the circuit board assembly 20, and effectively ensuring the overall use performance of the mobile terminal 100.

Further, referring to fig. 3, the transition portion 242 of the present embodiment includes an abutment cap 2421 and three connecting arms 2422. The abutment cap 2421 has a ring shape, and three connection arms 2422 are arranged at regular intervals along the circumferential side of the abutment cap 2421. One end of the connecting arm 2422 is connected to the contact cap 2421, and the other end is fixed to the conductive portion 241.

It is understood that the number of the connecting arms 2422 may be two, four, six, etc. instead of three as shown in the present embodiment, as long as the connecting arms 2422 are arranged at intervals on the circumferential side of the abutment cap 2421 and the connection is achieved between the abutment cap 2421 and the conductive part 241.

In the present embodiment, the abutting cap 2421 is sleeved outside the stud 231 of the lock screw 23, and the outer diameter of the abutting cap 2421 is smaller than the inner diameter of the through hole 2411 on the conducting part 241. The end surface of the abutment cap 2421 facing away from the conductive part 241 abuts against the nut 232 of the lock screw 23, and the connecting arm 2422 is disposed outside the stud 231 of the lock screw 23.

When the conducting portion 241 is in contact with the plastic portion 22b of the ground base 22, static electricity on the circuit board 21 can be conducted from the conducting portion 241 to the connecting arm 2422, then conducted from the connecting arm 2422 to the abutting cap 2421, and then conducted from the abutting cap 2421 to the lock screw 23 through the contact between the abutting cap 2421 and the nut 232 of the lock screw 23, and finally conducted from the lock screw 23 to the metal portion 22a of the ground base 22, so as to achieve grounding of the circuit board 21.

Further, the connecting arm 2422 of the present embodiment includes a straight section 2422a and a bent section 2422b formed by bending both ends of the straight section 2422a outward. The bending directions of the two bending sections 2422b are opposite, the end of one bending section 2422b is connected with the abutting cap 2421, and the end of the other bending section 2422b is fixed at the via hole 2411 of the conducting part 241.

The connecting arm 2422 is in transition connection with the conducting part 241 and the abutting cap 2421 through the two bending sections 2422b, and this arrangement enables the transition part 242 to conform to the extension of the mounting hole 25 with smaller size, ensures that the transition part 242 can be accommodated in the mounting hole 25 of the circuit board 21, and ensures the compactness of the arrangement of the grounding piece 24 and the circuit board 21.

In the present embodiment, the connection between the straight section 2422a and the bending section 2422b is in a circular arc transition. The straight section 2422a and the bending section 2422b can be integrally formed or can be formed by welding in sections.

Further, in the ground 24, in addition to the connection arm 2422, the abutment cap 2421 can be connected with the conductive part 241 through a connection column. The two ends of the connecting column are open and the inside of the connecting column is hollow. The interior of the attachment post is adapted to receive the stud 231 of the lock screw 23.

In the present embodiment, one end of the connection post is connected to the via 2411 of the conduction part 241, and the other end is connected to the outside of the abutment cap 2421. When the conductive portion 241 is disposed between the circuit board 21 and the ground base 22, the connection post is disposed in the mounting hole 25 of the circuit board 21 to pass the stud 231 of the lock screw 23.

Further, in addition to the transition portion 242 having the abutment cap 2421 and the connection arm 2422 shown in the present embodiment, the transition portion 242 may be provided as a cylindrical structure open at both ends.

In the present embodiment, the transition portion 242 has a tapered bore in its length direction. The end of the transition part 242 with a larger diameter is connected to the via 2411 of the conduction part 241, and the end face of the end with a smaller diameter is abutted to the nut 232 of the lock screw 23.

It is understood that the transition portion 242 may be provided with a constant caliber in the length direction, and only the connection portion between the transition portion 242 and the conducting portion 241 is provided with a curved portion in a circular transition, so as to ensure that the transition portion 242 extends straight in the mounting hole 25 of the circuit board 21.

Further, as shown in fig. 2, the circuit board assembly 20 of the present embodiment further includes an extension 26, and the extension 26 is disposed on the surface of the ground base 22 and located inside the transition portion 242.

In this embodiment, the extension 26 is disposed corresponding to the mounting hole 25 of the ground base 22, a connection hole 261 is opened on the extension 26 and is communicated with the mounting hole 25 of the ground base 22, and the inner walls of the connection hole 261 and the mounting hole 25 of the ground base 22 are both provided with threads adapted to the lock screw 23.

The extension 26 of the present embodiment is a metal member, and may be integrally extended outward from the ground base 22, or may be separately installed in the installation hole 25 of the ground base 22. When the extension member 26 is separately installed, it is in a cylindrical shape with openings at both ends, and the inner wall is provided with a thread adapted to the lock screw 23. The extension 26 has one end fixed to the mounting hole 25 of the ground base 22 and the other end extending inside the transition portion 242 of the ground member 24.

The circuit board 21 and the ground base 22 are fixed by the engagement of the lock screw 23 with the extension 26 and the screw thread on the mounting hole 25 of the ground base 22. The transition portion 242 of the grounding member 24 extends in the mounting hole 25 of the circuit board 21, so that the end of the extension member 26 can extend outward beyond the surface of the grounding base 22 to increase the fastening depth of the locking screw 23, thereby enhancing the connection strength between the circuit board 21 and the grounding base 22 and improving the structural stability of the whole circuit board assembly 20.

In the embodiment, the end of the extending part 26 far from the grounding base 22 abuts against the end surface of the abutment cap 2421, and this arrangement not only can further increase the fastening depth of the lock screw 23, but also can make the arrangement between the extending part 26 and the grounding part 24 more compact.

For the mobile terminal and the circuit board assembly thereof of the embodiment, the static electricity on the circuit board can be directly guided to the ground base through the conducting portion, or can be guided to the transition portion through the conducting portion, then is guided to the locking screw through the transition portion, and is guided to the ground base through the locking screw. The circuit board assembly can lead static electricity on the circuit board to the grounding base in time through the two static electricity conducting paths so as to eliminate static electricity interference on the circuit board, so that the mobile terminal can meet the requirements of lightness and thinness and internal antenna clearance, meanwhile, the circuit board can be prevented from being interfered by the static electricity, the normal use of the circuit board assembly is ensured, and the integral use performance of the mobile terminal is effectively ensured.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A circuit board assembly is characterized by comprising a circuit board, a grounding base, a locking screw and a grounding piece, wherein mounting holes are formed in corresponding positions of the circuit board and the grounding base, and the locking screw penetrates through the mounting holes so that the circuit board and the grounding base are fixed;

the grounding piece comprises a conducting part and a transition part, the conducting part is arranged between the circuit board and the grounding base, and the conducting part is provided with a through hole for the lock screw to pass through; the transition part is sleeved outside the stud of the lock screw, one end of the transition part is fixed on the conduction part, and the other end of the transition part extends along the direction of the mounting hole of the circuit board and abuts against the nut of the lock screw so as to conduct the static electricity of the circuit board to the grounding base.

2. The circuit board assembly according to claim 1, wherein the transition portion includes a plurality of abutment caps and a plurality of connection arms spaced along a circumferential side of the abutment caps, one ends of the connection arms being connected to the abutment caps, and the other ends of the connection arms being fixed to the conductive portions;

the butt joint cap is annular, and this butt joint cap cover is established the outside of lock screw double-screw bolt, the terminal surface top of butt joint cap supports the nut of lock screw.

3. The circuit board assembly according to claim 2, wherein the connecting arm comprises a straight section and a bent section formed by bending two ends of the straight section outwards, and the bending directions of the two bent sections are opposite; the end part of one bending section is connected with the abutting cap, and the end part of the other bending section is fixed at the opening of the conduction part.

4. The circuit board assembly of claim 3, wherein the connection between the straight section and the bent section is in a circular arc transition.

5. The circuit board assembly of claim 2, wherein the inner diameter of the conductive portion via is greater than the outer diameter of the abutment cap.

6. The circuit board assembly of claim 2, wherein the plurality of connecting arms are evenly spaced along a peripheral side of the abutment cap.

7. The circuit board assembly of claim 1, wherein the transition portion is cylindrical with two open ends, and a cavity for the lock screw to pass through is formed inside the transition portion; one end of the transition part is fixed at the opening of the conduction part, and the end face of the other end abuts against the nut of the locking screw.

8. The circuit board assembly of claim 1, further comprising an extension member that projects above the ground base, the extension member being disposed inside the transition portion;

the extension piece is arranged corresponding to the mounting hole of the grounding base, a connecting hole communicated with the mounting hole of the grounding base is formed in the extension piece, and threads matched with the locking screw are arranged on the inner wall of the connecting hole and the inner wall of the mounting hole of the grounding base.

9. The circuit board assembly of claim 8, wherein an end of the extension member distal from the ground base abuts an end of the transition portion.

10. A mobile terminal comprising a housing, characterized in that the mobile terminal further comprises a circuit board assembly according to any of claims 1-9, the circuit board assembly being arranged inside the housing.