CN104953239B - A kind of NFC antenna applied to mobile terminal - Google Patents

Abstract

The present invention relates to a kind of antenna assembly, more particularly to a kind of NFC antenna applied to mobile terminal.A kind of NFC antenna applied to mobile terminal, the mobile terminal includes a plastic rubber bracket and an at least metal insert, and the plastic rubber bracket includes an outside and an inner side, the inside lateral bend of plastic rubber bracket, metal insert fills the outside for being affixed on the plastic rubber bracket, it is characterised in that：The NFC antenna includes a FPC and an at least ferrite, and the FPC dress is affixed on side of the metal insert away from plastic rubber bracket, and the ferrite is located on the inside of plastic rubber bracket relative to the relevant position of FPC.It saves space, easy for installation.

Description

A kind of NFC antenna applied to mobile terminal

Technical field:

The invention relates to an antenna device, in particular to an NFC antenna applied to a mobile terminal.

Background technique:

With the diversification of functions of mobile terminals and the vigorous development of the mobile payment industry, more and more mobile terminals have added a near field communication (Near Field Communication, NFC for short) function.

Since NFC belongs to wireless communication, it needs to complete the signal transmission through the antenna. According to the communication protocol, the communication frequency of NFC falls at 13.56MHz. Since its wavelength is very long and the reading and writing distance is very short, the suitable coupling method is magnetic field coupling. is the best coupling method.

According to the current design requirements of mobile terminals, the antenna is generally built-in. Since the conventional clearance area is usually reserved for communication antennas and positioning antennas, most NFC antennas can only be placed on the battery or in areas with more metal. Since the antenna will generate eddy currents on the surface of the conductor that weaken the magnetic field of the antenna, in order to reduce the generation of eddy currents, ferrite is generally used in the industry to weaken the eddy currents. However, with the metallization and ultra-thinning of mobile terminals, and the increase in the application frequency band of mobile terminals, the compactness of antenna layout has made the layout and debugging of NFC more and more difficult.

For the design of the NFC antenna on the current mobile terminal, it is often necessary to avoid metal parts, avoid eddy currents, and generate a magnetic field for reverse cancellation. Therefore, it is usually necessary to add a layer of ferrite between the NFC trace and the metal part. At the same time, in order to ensure the performance of the NFC, it is often necessary to expand the area of the NFC antenna as much as possible, which puts a certain pressure on the manufacturing cost of the NFC antenna. At the same time, it is difficult to make the thickness of the ferrite that reduces the eddy current to meet the ultra-thin design, and the addition of the NFC antenna contradicts the design trend of the mobile terminal.

Take the existing NFC antenna shown in Figure 1 as an example, it includes a flexible circuit board 01, a ferrite 02 and colloid 03 on both sides of the ferrite, if installed on a flexible circuit board 01 as shown in Figure 2 and Figure 3 On this kind of mobile terminal, due to the tight layout of metal battery cover 04, camera 05, diversity antenna 06, fixing screw 07, wifi antenna 08, GPS antenna 09, speaker module 010 and short circuit device 011, there are many metal parts, so it is difficult to realize The large-area mounting of the NFC antenna seriously affects the performance of the NFC antenna.

Invention content:

The object of the present invention is to provide an NFC antenna applied to a mobile terminal. It saves space and is easy to install.

A kind of technical scheme applied to the NFC antenna of the mobile terminal described in the present invention is realized like this:

An NFC antenna applied to a mobile terminal, the mobile terminal includes a plastic bracket and at least one metal insert, the plastic bracket includes an outer side and an inner side, the plastic bracket is bent inward, and the metal insert is attached to the The outer side of the plastic bracket is characterized in that the NFC antenna includes a flexible circuit board and at least one ferrite, the flexible circuit board is mounted on the side of the metal insert away from the plastic bracket, and the ferrite is located on the plastic The corresponding position of the inside of the bracket relative to the flexible circuit board.

Compared with the prior art, a kind of NFC antenna applied to mobile terminals of the present invention has the following advantages:

1. The existing completely independent NFC antenna is disassembled and combined with the original plastic bracket and metal insert of the mobile terminal to form the NFC antenna of the present invention, and the flexible circuit board and ferrite are mounted respectively so that the The above NFC antenna has more options for mounting, and at the same time, the plastic bracket and metal insert effectively improve the structural strength of the NFC antenna;

2. Existing mobile terminals are usually equipped with a display screen, and the plastic bracket (such as the back cover of the mobile terminal) is usually arranged behind the display screen and bent toward the inside of the plastic bracket where the display screen is located. The bending of the plastic bracket provides ferrite The installation space allows the ferrite to be mounted without occupying the thickness of the mobile terminal. The thickness of the traditional NFC antenna becomes the thickness of a flexible circuit board, which effectively reduces the overall thickness of the mobile terminal;

3. When there are multiple metal inserts, the separate metal inserts can be connected to form a larger usable area of the NFC antenna device, further improving the performance of the NFC antenna.

The above-mentioned mobile terminal has one metal insert, and the flexible circuit board is mounted on the metal insert and is located on the side of the metal insert away from the plastic bracket.

There are multiple metal inserts in the above-mentioned mobile terminal, and the flexible circuit board is attached to at least one metal insert and is located on a side of the metal insert away from the plastic support.

The shape of the above-mentioned flexible circuit board and all metal inserts attached to it is the same or similar, or the shape of all ferrite is the same or similar to that of all metal inserts attached to the flexible circuit board.

Description of drawings:

Below in conjunction with accompanying drawing, the present invention is described in detail:

FIG. 1 is a schematic structural diagram of an existing NFC antenna;

FIG. 2 is a schematic structural diagram of a conventional mobile terminal;

Figure 3 is a partially enlarged view of Figure 2;

FIG. 4 is a front perspective view of Embodiment 1 of an NFC antenna applied to a mobile terminal according to the present invention;

FIG. 5 is a perspective view of the back side of Embodiment 1 of an NFC antenna applied to a mobile terminal according to the present invention;

FIG. 6 is a schematic diagram of the assembly of the first embodiment of an NFC antenna applied to a mobile terminal according to the present invention and the mobile terminal;

7 is a front perspective view of Embodiment 2 of an NFC antenna applied to a mobile terminal according to the present invention;

FIG. 8 is a perspective view of the back side of Embodiment 2 of an NFC antenna applied to a mobile terminal according to the present invention;

FIG. 9 is a front perspective view of Embodiment 3 of an NFC antenna applied to a mobile terminal according to the present invention;

FIG. 10 is a perspective view of the back side of Embodiment 3 of an NFC antenna applied to a mobile terminal according to the present invention.

detailed description:

As shown in Fig. 4, Fig. 5 and Fig. 6, it is a kind of NFC antenna embodiment 1 applied to the mobile terminal according to the present invention:

An NFC antenna applied to a mobile terminal, the mobile terminal includes a plastic bracket 3 and at least one metal insert 4, the plastic bracket 3 includes an outer side and an inner side, the plastic bracket 3 is bent inward, and the metal insert 4 Attached to the outside of the plastic bracket 3, the NFC antenna includes a flexible circuit board 1 and at least one ferrite 2, the flexible circuit board 1 is attached to the side of the metal insert 4 away from the plastic bracket 3, The ferrite 2 is located at a corresponding position inside the plastic bracket 3 relative to the flexible circuit board 1 .

The flexible circuit board 1 is mounted on the metal insert 4, and is located on the side of the metal insert 4 away from the plastic bracket 3. In this embodiment, the metal insert 4 attached to the flexible circuit board is a mobile The terminal is originally used to increase the structural strength of the metal insert. In order to realize the similar shape to the flexible circuit board, according to the inner structure of the plastic bracket and the arrangement of the mobile terminal structure, it is separated and punched into several small pieces of iron. Oxygen body to maximize the use of the internal space of the mobile terminal and reduce the generation of eddy currents.

In this embodiment, the metal insert 4 is embedded into the plastic bracket 3 by hot melting or injection molding; between the ferrite 2 and the plastic bracket 3, between the flexible circuit board 1 and the metal insert 4, through glue mount.

FIG. 7 and FIG. 8 are schematic structural diagrams of Embodiment 2 of an NFC antenna applied to a mobile terminal according to the present invention;

The difference from the first embodiment is that the second embodiment uses the metal insert 41 originally belonging to the speaker device and the metal insert 42 used to increase the structural strength as the entire metal insert, and the plastic corresponding to the metal insert 41 of the speaker device Ferrite is also added to the inner side of the bracket, so that the overall shape composed of several ferrites is similar to the shape of the metal insert.

By using the metal insert 41 of the speaker device as a part of the metal insert, a larger usable area of the NFC antenna device is formed, and the function of the NFC antenna device is further improved.

FIG. 9 and FIG. 10 are schematic structural diagrams of Embodiment 3 of an NFC antenna applied to a mobile terminal according to the present invention;

Different from Embodiment 1, the metal insert of the NFC antenna in Embodiment 3 includes the metal insert 42 originally used to increase the structural strength of the mobile terminal and the metal ring 43 for the decoration of the camera. The shape of the integral metal insert composed of the piece 42 and the metal ring 43 for the decoration of the camera is similar to that of the flexible circuit board 1 .

By using the decorative metal ring 43 of the camera as a part of the metal insert, a larger usable area of the NFC antenna device is formed, and the function of the NFC antenna device is further improved.

The above content is a further detailed description of the present invention in conjunction with specific examples, and it cannot be considered that the specific implementation is limited to these descriptions. For example: the metal insert is not limited to one or a combination of the metal insert used to increase the structural strength, the metal insert of the speaker device, and the decorative metal ring for the camera; the plastic bracket is not limited to the back cover of the mobile terminal The installation method between the metal insert and the plastic bracket is not limited to hot-melt or injection molding; between the ferrite and the plastic bracket, between the flexible circuit board and the metal insert is not limited to colloid mounting and the like. For those skilled in the technical field to which the present invention belongs, on the premise of not departing from the concept of the present invention, the specific embodiments of the present invention are not limited to the above examples. In the specific implementation process of the present invention, the specific embodiments can also be made Several deduction or optimization, these deduction or optimization should be regarded as belonging to the protection scope of the present invention.

Claims (4)

1. a kind of NFC antenna applied to mobile terminal, the mobile terminal includes a plastic rubber bracket and an at least metal insert, The plastic rubber bracket includes an outside and an inner side, the inside lateral bend of plastic rubber bracket, and metal insert dress is affixed on the plastic rubber bracket Outside, it is characterised in that：The NFC antenna includes a FPC and an at least ferrite, the FPC dress Side of the metal insert away from plastic rubber bracket is affixed on, the ferrite is located on the inside of plastic rubber bracket relative to the phase of FPC Answer position.

A kind of 2. NFC antenna applied to mobile terminal according to claim 1, it is characterised in that：The mobile terminal Metal insert quantity be one, FPC dress be affixed on the metal insert, and positioned at metal insert away from plastic cement The side of support.

A kind of 3. NFC antenna applied to mobile terminal according to claim 1, it is characterised in that：The mobile terminal Metal insert quantity to be multiple, FPC dress is affixed at least one metal insert, and remote positioned at metal insert The side of plastic rubber bracket.

A kind of 4. NFC antenna applied to mobile terminal according to claim 1, it is characterised in that：The flexible circuitry Plate and the shape formed by all metal inserts of its dress patch are same or like, or the shape and flexible of all ferrites composition The shape of all metal inserts composition of wiring board dress patch is same or like.