CN109361785B

CN109361785B - Noise shielding structure and terminal equipment

Info

Publication number: CN109361785B
Application number: CN201811204138.8A
Authority: CN
Inventors: 肖疆; 张海龙
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2018-10-16
Filing date: 2018-10-16
Publication date: 2021-04-13
Anticipated expiration: 2038-10-16
Also published as: CN109361785A

Abstract

The present disclosure relates to a noise shielding structure and a terminal device, the noise shielding structure including: a plurality of sensing assemblies and electrical conductors; the electric conductor is sheet-shaped and is provided with a hollow part; the plurality of sensing assemblies are overlapped through the electric conductor. According to the noise shielding structure, the hollowed parts are arranged on the electric conductor, so that the stress of the material is relieved, the electric conductor is not tilted, and the connection is firm.

Description

Noise shielding structure and terminal equipment

Technical Field

The present disclosure relates to a wireless terminal device, and more particularly, to a noise shielding structure and a terminal device including the same.

Background

In terminal equipment such as a mobile phone, with the application of a full screen and the improvement of battery capacity, the screen and the battery occupy more space of the equipment, so that the space which can be utilized by an antenna module is reduced. A screen (an LCD screen, an OLED screen, or the like), a camera module, and other functional modules in the terminal device are connected to a PCB main board through an FPC (Flexible Printed Circuit). The antenna module is closer to the active module due to the tight internal space, so that the noise generated by the active module affects the antenna module more badly. Noise is coupled to the antenna and received by the receiver, which degrades the antenna receiving sensitivity and generates a sense (or referred to as a desentization, which refers to a phenomenon in which the noise degrades the receiving sensitivity). The sense directly affects the experience of the user when the user uses multiple functions of the terminal device at the same time, for example, when a call comes, the ring sounds, the screen is also lighted, noise is generated, and the situation that the call cannot be connected or the call is dropped at the moment when the mobile phone is connected is very easy to occur.

The copper foil, the conductive cloth, the conductive foam and the like have good conductivity, so that the electromagnetic shielding performance is realized. In the related art, copper foil, conductive cloth, conductive foam and the like are often used as shielding materials, and different noise modules are shielded or lapped with the ground by using the shielding materials, so that noise radiation interference on nearby antennas is suppressed, and the sense is improved. The sense is reduced by 3dB, which is equivalent to shortening the reliable distance between the mobile phone and the base station by 1 time, and the sense performance can affect the user experience, resulting in the reduction of the competitiveness of the product.

Copper foil has good electromagnetic shielding performance and is often the preferred material for shielding materials. However, when the thickness of the copper foil is smaller than 30 μm, the copper foil is easy to curl after the centrifugal paper is removed, which causes great difficulty in the pasting process by using a machine, difficult operation during manual pasting, time and labor waste, and increased production cost. When the copper foil is thick, for example, more than 30 μm, the two ends of the copper foil may not be easily fixed if there is a height difference or overlap due to the stress of the material and the elasticity of the material during the overlapping. As shown in fig. 1, both ends of the copper foil 30 are lapped on the first unit 10 and the second unit 20 having a height difference, and the copper foil 30 may be warped or curled at the edges of the first unit 10 and the second unit 20, resulting in weak lapping.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides a noise shielding structure, which prevents the copper foil of the lap joint noise module from tilting and ensures a firm connection.

According to a first aspect of embodiments of the present disclosure, there is provided a noise shielding structure, including:

a plurality of sensing assemblies and electrical conductors;

the electric conductor is sheet-shaped and is provided with a hollow part;

the plurality of sensing assemblies are overlapped through the electric conductor.

Preferably, at least one of the plurality of sensing assemblies includes a noise module, and the electrical conductor is used to form a shield or ground reference for the noise module.

Preferably, the plurality of sensing elements form at least part of a noise module, and the electrical conductor is adapted to overlap the plurality of sensing elements of the same noise module.

Preferably, the noise module includes a module body, and an FPC, a chip, and a shield case connected to the module body.

Preferably, the hollowed-out part is a through hole and/or a gap.

Preferably, the length direction of the slit coincides with a direction in which the plurality of sensing members are separated.

Preferably, the hollow portion is located at a middle portion in a length direction of the conductor.

Preferably, an antenna module is arranged beside the noise shielding structure, and the maximum size of the hollow part is smaller than 1/50 of the corresponding wavelength of the highest working frequency of the antenna module.

Preferably, there is a height difference between the surfaces of the sensing components overlapping the conductive body.

Preferably, the conductor is a copper foil, and the thickness of the copper foil is more than 30 μm.

According to a second aspect of the embodiments of the present disclosure, there is provided a terminal device including the noise shielding structure according to any one of the aspects of the present disclosure.

The technical scheme provided by the embodiment of the disclosure can obtain the following beneficial effects: the hollowed parts are arranged on the electric conductor, so that the stress of the material is relieved, the electric conductor is not tilted, and the connection is firm.

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 present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic view illustrating a noise shielding structure according to the related art.

Fig. 2 is a schematic diagram illustrating a noise shielding structure according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating the structure of a conductive body of a noise shielding structure according to an exemplary embodiment.

Fig. 4 is a schematic diagram illustrating the structure of another electrical conductor of the noise shielding structure according to an exemplary embodiment.

Description of the reference numerals

10 first unit 20 second unit 30 copper foil

1 first unit 2 second unit 3 hollowed out part of conductor 31.

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.

The present invention provides a terminal device such as a cellular phone, which is internally mounted with an antenna module and a noise module that may cause interference with the antenna module, the noise module being located beside the antenna module, thereby causing interference with the antenna module. The noise module includes active modules such as a camera module, a touch module, a screen function module, a fingerprint recognition module, a light sensor module, and the like. The active module requires a power supply for its normal operation, and thus may generate electromagnetic noise. It will be appreciated that the noise module may also be a passive module, which is capable of conducting noise and therefore also acts as a noise module. The noise module includes a module body and an FPC (Flexible Printed Circuit), a chip, and a shield case connected to the module body.

As shown in fig. 2, two sensing assemblies are overlapped through the conductive body 3, it is understood that the number of the sensing assemblies is two for illustration only, and more sensing assemblies can be overlapped through the conductive body 3 according to actual needs. The two sensing components are a first unit 1 and a second unit 2 respectively, for example, the first unit 1 can be a touch module FPC in an LCD module, and the second unit 2 can be a functional module FPC in the LCD module, and the first unit 1 and the second unit 2 are connected through a conductor 3 to form a shield for a noise module. In particular, the conductor 3 is connected to the conductive portion of the first unit 1 and the conductive portion of the second unit 2, and the elements of the first unit 1 and the second unit 2, which may be in contact with the conductor 3 and short-circuited, are insulated from being electrically connected to the conductor 3. The conductor 3 is made of a material having a good conductive property, such as copper foil, aluminum foil, conductive cloth, and conductive foam, for example, the conductor 3 may be made of copper foil. Further, the conductor 3 is made of copper foil having a thickness of more than 30 μm.

In one possible embodiment, there is a height difference between the surface of the touch module FPC in the LCD module and the surface of the functional module FPC in the LCD module. Due to the height difference, the conductive body 3 is easily tilted or bent in the lap joint with the touch module FPC in the LCD module and the functional module FPC in the LCD module.

As shown in fig. 3 and 4, the conductor 3 is provided with one or more hollow portions 31, the shape of the hollow portion 31 may be circular, and it is understood that the hollow portion 31 may also be oval, rectangular, triangular, etc.

As shown in fig. 4, the hollowed portion 31 may be a slit formed by cutting a slit in the conductor 3. The direction of the slit (the length direction of the slit) may coincide with the direction in which the first unit 1 and the second unit 2 are separated (the length direction of the conductor 3), and a plurality of slits may be provided in the width direction of the conductor 3. The direction in which the first unit 1 and the second unit 2 are separated is the direction of a straight line connecting the first unit 1 and the second unit 2, and since there may be a height difference between the first unit 1 and the second unit 2, the direction of the slit and the direction in which the first unit 1 and the second unit 2 are separated may not completely coincide. It will be appreciated that the slits may be in other directions, for example substantially perpendicular to the length of the electrical conductor 3, depending on the particular configuration and location of the overlapping first and

second elements

1, 2. The stress of the conductor 3 can be reduced by the hollow portion 31 provided in the conductor 3, and the conductor 3 can be attached flat to the surface of the first unit 1 or the second unit 2.

The maximum size of the hollow portion 31 is smaller than 1/50 of the wavelength corresponding to the highest frequency of the antenna module during operation, for example, the highest frequency of the antenna module during operation is 3GHz, and the corresponding wavelength is 100mm, and then the maximum size of the hollow portion 31 is smaller than 2 mm. It can be understood that the maximum dimension of the hollow portion 31 is the diameter of the circle when the hollow portion 31 is the circle, the maximum dimension of the hollow portion 31 is the diagonal dimension of the rectangle when the hollow portion 31 is the rectangle, and the maximum dimension of the hollow portion 31 is the length of the gap when the hollow portion 31 is the gap.

The hollow portion 31 may be located at a substantially middle portion of the conductor 3, and both ends of the conductor 3 are connected to the first unit 1 and the second unit 2, respectively. It can be understood that the position of the hollow portion 31 can be arranged according to the routing of the FPC or the PCB, so that the hollow portion 31 can avoid the circuit portion of the FPC or the PCB, and the shielding effect is ensured.

It should be understood that the hollowed-out portion 31 may not only be located at a position between the first unit 1 and the second unit 2, but also partially overlap with the first unit 1 and/or the second unit 2. In particular, the hollowed-out portion 31 may be located near an edge position of the first cell 1 and/or near an edge position of the second cell 2.

If the terminal equipment has a good shielding effect, reliable video telephony can be guaranteed, and a plurality of noise modules are required for video call to work simultaneously. For example, when the non-call state is converted into the stable call state, the camera module, the speaker module, the screen and the like can be ensured to work simultaneously, and the video telephone is realized.

Of course, the present disclosure is not limited to the above-described embodiments, and those skilled in the art, having the benefit of the present disclosure, may make various changes and modifications to the above-described embodiments of the present invention without departing from the scope of the present invention

(1) The sensing component described in the above embodiments is a touch module FPC in an LCD module and a functional module FPC in an LCD module, and they are connected by using the electrical conductor 3, however, the present disclosure is not limited thereto, and the sensing component may be a different module (module body). For example, a cell phone typically has multiple camera modules, and the electrical conductor 3 can be used between different camera modules and/or with the camera modules overlapping a shield case to provide shielding or ground reference between the multiple camera modules. The shielding cover is used for shielding the influence of external electromagnetic waves on an internal circuit and the radiation of the electromagnetic waves generated inside to the outside, is common in terminal equipment such as mobile phones and the like, and is not described any more.

(2) The sensing component can also be an FPC of the same noise module, such as a screen FPC, and both ends of the electric conductor 3 are lapped on the FPC of the screen, particularly, the part needing to be bent in the FPC of the screen. Specifically, FPCs using screens of COG (Chip on Glass), COF (Chip on FPC, Chip on flexible circuit board) or COP (Chip on Plastic) technology may use the noise shielding structure of the present disclosure.

(3) In order to isolate the noise module from the antenna module, a copper foil is usually selected to shield or overlap the noise module with the ground, and the noise module may be small in size and may be overlapped by a metal material near the noise module for better overlapping reliability and shielding effect. That is, the first unit and the second unit may be only the first unit as a noise module, and the second unit as a shield case or a member made of other metal materials.

In summary, the module body, the FPC, the shield cover, or other parts made of metal materials in the noise module can be lapped as the sensing assembly through the electrical conductor.

(4) Not only can overlap joint two noise module, can also be with a plurality of different modules, the electric conductor links to each other a plurality of different module overlap joints, can have the difference in height also can be in same height between the different modules.

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 application 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 to be limited only by the terms of the appended claims.

Claims

1. A mobile terminal comprising an antenna module and a noise shielding structure, wherein the noise shielding structure comprises:

a plurality of sensing assemblies and electrical conductors;

the conductor is a sheet copper foil with a thickness of more than 30 mu m and a hollow part, the hollow part is positioned in the middle of the conductor in the length direction, and the maximum size of the hollow part is less than 1/50 of the wavelength corresponding to the highest working frequency of the antenna module;

the sensing assemblies are overlapped through the electric conductor, and the surfaces of the sensing assemblies, which are overlapped with the electric conductor, have height difference.

2. The mobile terminal of claim 1, wherein at least one of the plurality of sensing assemblies comprises a noise module, and wherein the conductive body is configured to shield or reference the noise module.

3. The mobile terminal of claim 1, wherein the plurality of sensing elements form at least a portion of a noise module, and the conductive body is configured to overlap the plurality of sensing elements of the same noise module.

4. A mobile terminal according to claim 2 or 3, wherein the noise module comprises a module body and an FPC, a chip and a shield case connected to the module body.

5. The mobile terminal according to claim 1, wherein the hollowed-out portion is a through hole and/or a slit.

6. The mobile terminal of claim 5, wherein a length direction of the slit coincides with a direction in which the plurality of sensing components are separated.