CN209981458U

CN209981458U - NFC antenna

Info

Publication number: CN209981458U
Application number: CN201920675715.5U
Authority: CN
Inventors: 宋俊; 赵享平
Original assignee: Hunan Hanshun Electronic Technology Co Ltd
Current assignee: Hunan Hanshun Electronic Technology Co Ltd
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2020-01-21
Anticipated expiration: 2029-05-13

Abstract

The utility model discloses a NFC antenna belongs to antenna technical field. The device is including ferrite layer, coil pack and the FPC subassembly that the stromatolite set up in proper order, and the coil pack includes the PET substrate layer and sets up the aluminum coil on the substrate layer, and the both ends of aluminum coil are provided with the coil contact. The FPC assembly comprises a double-sided FPC board and two connecting wires arranged on the FPC board, wherein two ends of the two connecting wires are respectively provided with an inner contact point connected with the aluminum coil and an outer contact point connected with an external circuit, and the main body of the structure of the FPC board is a square structure taking the two inner contact points as diagonal points. The utility model discloses the size of FPC board has been reduced to the material on coil layer is aluminium coil, makes NFC antenna device's manufacturing cost reduce.

Description

NFC antenna

Technical Field

The utility model relates to an antenna technology field specifically is a NFC antenna.

Background

A conventional NFC (Near Field Communication) antenna is generally formed by bonding a ferrite layer and a double-sided FPC Board (Flexible Printed Circuit Board), wherein the double-sided FPC Board is formed by laminating insulating cover films on both sides of a double-sided substrate after a coil pattern is formed by etching, the size of the used double-sided FPC Board is large and almost equal to that of the ferrite layer, and the coil layer is a copper or silver coil, which results in high production cost.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at solving current technical problem, provides a lower, the structure optimization's of cost NFC antenna.

In order to achieve the above object, an aspect of the present invention provides an NFC antenna, including a ferrite layer, a coil assembly and an FPC assembly stacked in sequence from bottom to top, where the coil assembly includes a substrate layer and an aluminum coil disposed on the substrate layer, coil contacts are disposed at two ends of the aluminum coil, and the ferrite layer is bonded to a side of the substrate layer where the aluminum coil is not disposed; the FPC assembly comprises an FPC board and two connecting wires arranged on the FPC board, the FPC board is a double-sided FPC board, two ends of the two connecting wires are respectively provided with an inner contact point connected with the aluminum coil and an outer contact point connected with an external circuit, the inner contact point is connected with the coil contact, and an insulating cover film is pasted on the outer layer of the FPC board provided with the two connecting wires.

Further, the aluminum coil is disposed on the base material layer in a square spiral shape with a side length gradually reduced.

Furthermore, coil contacts at two ends of the aluminum coil are located at the same angle close to the substrate layer.

Further, the main structure of the FPC board is a square structure with two inner contact points as diagonal points.

Furthermore, one corner of the square structure of the main body of the FPC board is aligned with the corner of the substrate layer where the coil contact is located, and the side length of the square structure of the main body of the FPC board is smaller than one half of the length of the short side of the substrate layer.

Further, the material of the substrate layer is PET (Polyethylene terephthalate).

Further, conductive glue is coated between the inner contact and the coil contact.

Due to the adoption of the technical scheme, the utility model discloses reach following technological effect:

the utility model discloses a structure of FPC board that NFC antenna used is for using two interior contact point is the square structure of diagonal point, and the length of a side of the square structure of the main part of FPC board is less than the half of the minor face length of substrate layer makes the size of FPC board obviously be less than the size of substrate layer to the material on coil layer is aluminium coil, makes NFC antenna device's manufacturing cost reduce.

Drawings

Fig. 1 is an exploded view of the structure of an NFC antenna.

Fig. 2 is a schematic structural view of the FPC assembly.

Fig. 3 is a front view of the NFC antenna.

In the drawings: 1-ferrite layer, 2-coil component, 21-base material layer, 22-aluminum coil, 23-coil contact, 3-FPC component, 31-FPC board, 32-connecting lead, 33-inner contact, 34-outer contact, 35-insulating covering film and 4-double-sided adhesive tape.

Detailed Description

Embodiments of the present invention are further described below with reference to the accompanying drawings.

Referring to fig. 1 to 3, in one aspect, an NFC antenna is provided, which includes a ferrite layer 1, a coil component 2, and an FPC component 3 stacked in this order from bottom to top. The coil assembly 2 includes a base material layer 21 and an aluminum coil 22 provided on the base material layer 21, and the aluminum coil 22 is provided on the base material layer 21 in a square spiral shape with a side length gradually reduced. Coil contacts 23 are arranged at two ends of the aluminum coil 22, and the two coil contacts 23 are positioned at the same corner close to the substrate layer 21.

In this embodiment, the material of the base material layer 21 is PET, the ferrite layer 1 is ferrite, and the ferrite layer 1 is bonded to the side of the base material layer 21 where the aluminum coil 22 is not provided.

The FPC assembly 3 includes an FPC board 31 and two connecting wires 32 provided on the FPC board 31, and both ends of the two connecting wires 32 are provided with an inner contact 33 connected to the aluminum coil 22 and an outer contact 34 connected to an external circuit, respectively. The FPC board 31 is a double-sided FPC board 31, the main body structure of the FPC board 31 is a square structure, the side length of the square structure is smaller than one half of the length of the short side of the base material layer, the inner contact points 33 are arranged at a pair of corners of the square structure of the main body of the FPC board 31, and a protruding portion is further arranged at the upper portion of the square structure of the main body of the FPC board 31 and used for arranging the outer contact points 34. One corner of the square structure of the main body of the FPC board 31 is aligned with the corner of the base material layer 21 where the coil contact 23 is located. Conductive glue (not shown) is coated between the inner contact point 33 and the coil contact 23, and an insulating cover film 35 is attached to the FPC board 31 at the outer layer where the two connecting wires 32 are provided.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. An NFC antenna is characterized by comprising a ferrite layer, a coil assembly and an FPC assembly which are sequentially stacked from bottom to top, wherein the coil assembly comprises a substrate layer and an aluminum coil arranged on the substrate layer, coil contacts are arranged at two ends of the aluminum coil, and the ferrite layer is bonded with one side, not provided with the aluminum coil, of the substrate layer; the FPC assembly comprises an FPC board and two connecting wires arranged on the FPC board, the FPC board is a double-sided FPC board, two ends of the two connecting wires are respectively provided with an inner contact point connected with the aluminum coil and an outer contact point connected with an external circuit, the inner contact point is connected with the coil contact, and an insulating cover film is pasted on the outer layer of the FPC board provided with the two connecting wires.

2. An NFC antenna according to claim 1, wherein said aluminum coil is disposed on said substrate layer in a spiral shape having a side length decreasing in a square shape.

3. An NFC antenna according to claim 1 or 2, wherein the coil contacts at the two ends of the aluminum coil are located at the same corner near the substrate layer.

4. The NFC antenna according to claim 1, wherein the main structure of the FPC board is a square structure with two inner contact points as diagonal points.

5. The NFC antenna according to claim 4, wherein one corner of the square structure of the FPC board body is aligned with the corner of the substrate layer where the coil contact is located, and the side length of the square structure of the FPC board body is less than half of the length of the short side of the substrate layer.

6. The NFC antenna according to claim 1, wherein the substrate layer is made of PET.

7. An NFC antenna according to claim 1, wherein said inner contact and said coil contact are further coated with a conductive glue therebetween.