阅读说明：本技术 球形nfc天线装置和智能卡 (Spherical NFC antenna device and smart card ) 是由 杨广新 薄秀虎 卢勇 翁照荣 单国辉 龚志远 吴思强 于 2020-07-13 设计创作，主要内容包括：本发明提供一种球形NFC天线装置和智能卡,球形NFC天线装置包括芯片和至少三个圆环状的天线,多个天线两两相交且共球心设置,芯片与天线电连接,芯片设置在多个天线所围成的球体内侧。该球形NFC天线装置结构紧凑、装配容易且无论以任何方向接近读卡器均能保证读卡能量和信号强度。(The invention provides a spherical NFC antenna device and an intelligent card, wherein the spherical NFC antenna device comprises a chip and at least three annular antennas, the antennas are intersected pairwise and arranged in a concentric manner, the chip is electrically connected with the antennas, and the chip is arranged on the inner side of a sphere formed by the antennas in a surrounding manner. The spherical NFC antenna device has the advantages of compact structure, easiness in assembly and capability of ensuring card reading energy and signal intensity no matter the spherical NFC antenna device approaches a card reader in any direction.)

1. Spherical NFC antenna device, its characterized in that includes chip and at least three ring form antenna, and is a plurality of two liang of crossing and the common centre of sphere setting of antenna, the chip with the antenna electricity is connected, the chip sets up and is a plurality of the spheroid inboard that the antenna encloses.

2. The spherical NFC antenna device according to claim 1, wherein:

the antenna comprises a circuit board, wherein the circuit board comprises a substrate and an antenna coil, and the antenna coil is arranged on the substrate.

3. The spherical NFC antenna device according to claim 1, wherein:

the plurality of antennas comprise a first antenna, a second antenna and a third antenna, and the plane where the first antenna is located, the plane where the second antenna is located and the plane where the third antenna is located are perpendicular to each other in pairs.

4. The spherical NFC antenna device according to claim 3, wherein:

the first antenna comprises a circular first circuit board, the first circuit board comprises a first substrate and a first antenna coil, and the first antenna coil is arranged on the first substrate;

the second antenna comprises two semicircular second circuit boards, each second circuit board comprises a second substrate and a plurality of semicircular first wires which are arranged concentrically, the two second substrates are fixedly connected into a circular ring shape, the end parts of the two second circuit boards are fixedly connected with the first circuit board, and the first wires are correspondingly connected to form a circular second antenna coil;

the third antenna comprises four third circuit boards which are sequentially connected end to end, the third circuit boards are all in a quarter circular arc shape, each third circuit board comprises a third base plate and a plurality of semicircular second wires which are arranged in a concentric mode, the third base plates are sequentially fixedly connected into a circular ring shape, two ends of each third circuit board are respectively fixedly connected with the first circuit board and the second circuit board, and the second wires on the third circuit boards are correspondingly connected to form a circular ring-shaped third antenna coil.

5. The spherical NFC antenna device according to claim 4, wherein:

and a chip mounting plate is arranged on one of the third circuit boards, the chip mounting plate extends from one end of the third circuit board to the central axis of the third antenna along the radial direction of the third antenna, and the chip is mounted on the chip mounting plate and is electrically connected with the third circuit board.

6. Spherical NFC antenna device according to one of the claims 1 to 5, characterized in that:

a plurality of the antennas are connected in series.

7. Smart card characterized in that it comprises a spherical NFC antenna device according to any of claims 1 to 6.

Technical Field

The invention relates to the technical field of smart cards, in particular to a spherical NFC antenna device and a smart card.

Background

At present, the application of the non-contact smart card is rapidly increased, and the non-contact smart card is widely applied to various fields in daily life. The NFC antenna used by the existing non-contact smart card requires planar card reading, and when the planar card reading is carried out, the NFC antenna can cut magnetic lines of force emitted by an antenna coil of the card reader along with the fact that the non-contact smart card is continuously close to the card reader, so that current is generated, and the chip of the NFC antenna works and is identified by the card reader. However, if the card is held upright for reading the card, the NFC antenna does not cut the magnetic lines emitted by the antenna coil of the card reader, induction is not generated, the chip does not work, and the card reader cannot recognize the magnetic lines.

The NFC antenna that is the triangular pyramid has all arranged an antenna coil for every face of triangular pyramid, though can solve above-mentioned problem to a certain extent, but the antenna coil that adopts is more and arranges into the degree of difficulty of three-dimensional shape with a plurality of interconnect's antenna coil great, and difficult equipment also can't guarantee simultaneously no matter the NFC antenna is close the card reader homoenergetic in any direction and obtains the biggest card energy of reading.

Disclosure of Invention

A first object of the present invention is to provide a spherical NFC antenna device which is compact in structure, easy to assemble, and capable of securing card reading power and signal strength regardless of approach of a card reader in any direction.

It is a second object of the present invention to provide a smart card having the above-described spherical NFC antenna device.

In order to achieve the first object, the present invention provides a spherical NFC antenna device, which includes a chip and at least three circular antennas, wherein the antennas are intersected with each other and arranged concentrically, the chip is electrically connected to the antennas, and the chip is arranged inside a sphere surrounded by the antennas.

According to the scheme, the NFC antenna device is spherical as a whole through the intersection of the at least three antennas, so that the NFC antenna device can be sensed no matter which angle the NFC antenna device approaches the card reader. Meanwhile, the spherical NFC antenna device is compact in overall structure and beneficial to miniaturization due to the fact that the spherical NFC antenna device is arranged in a spherical mode. And no matter which angle the card reader is approached to, at least one antenna can be ensured to cut the magnetic force lines emitted by the coil of the card reader, so that the card reading energy and the signal intensity are ensured, and the chip is awakened to work.

In a preferred embodiment, the antenna comprises a circuit board, the circuit board comprises a substrate and an antenna coil, and the antenna coil is arranged on the substrate.

Therefore, compared with the prior art in which an enameled wire coil is wound to form an antenna coil, the circuit board has the advantages that the circuit board does not generate the drift of inductance and resonant frequency due to the change of the line type, the enameled wire is soft and easy to drift, the circuit board is hard, the circuit board can keep the distance between two adjacent wires, the inductance is kept unchanged, and the drift of the resonant frequency can be avoided.

Preferably, the plurality of antennas include a first antenna, a second antenna and a third antenna, and the plane where the first antenna is located, the plane where the second antenna is located and the plane where the third antenna is located are perpendicular to each other in pairs.

Therefore, when each antenna cuts magnetic lines of force, the spherical NFC antenna device can obtain the maximum induction signal no matter in which direction the spherical NFC antenna device approaches the card reader, and therefore the working stability of the chip is guaranteed. And the three antennas are connected into a sphere according to three axial directions of XYZ, so that the coverage angle is large, and the energy distribution is more uniform.

The first antenna comprises a circular first circuit board, the first circuit board comprises a first substrate and a first antenna coil, and the first antenna coil is arranged on the first substrate. The second antenna comprises two semicircular second circuit boards, each second circuit board comprises a second substrate and a plurality of semicircular first wires arranged in a concentric mode, the two second substrates are fixedly connected into a circular ring shape, the end portions of the two second circuit boards are fixedly connected with the first circuit boards, and the first wires are correspondingly connected to form a circular second antenna coil. The third antenna comprises four third circuit boards which are sequentially connected end to end, the four third circuit boards are all in a quarter arc shape, each third circuit board comprises a third base plate and a plurality of semicircular second wires which are arranged in a concentric mode, the four third base plates are sequentially fixedly connected into a circular ring shape, two ends of each third circuit board are respectively fixedly connected with the first circuit board and the second circuit board, and the second wires on the four third circuit boards are correspondingly connected to form a circular third antenna coil.

Still further, a chip mounting plate is arranged on one of the third circuit boards, the chip mounting plate extends from one end of the third circuit board to a central axis of the third antenna along a radial direction of the third antenna, and the chip is mounted on the chip mounting plate and electrically connected with the third circuit board.

In a preferred embodiment, the plurality of antennas are connected in series.

It follows that a series connection can achieve a higher voltage than a parallel connection at the same energy, while a parallel connection can achieve a higher current than a series connection. The trigger condition of the chip is voltage trigger, and the current needs to be very weak, so the serial connection can obtain the voltage capable of triggering the chip under the condition that the signal is very weak, the communication is more sensitive, and the chip is more easily sensed by the card reader.

To achieve the second objective, the present invention provides a smart card, which includes the spherical NFC antenna device.

Drawings

Fig. 1 is a perspective view of an embodiment of a spherical NFC antenna device of the present invention.

Fig. 2 is a front view of an embodiment of the spherical NFC antenna device of the present invention.

Fig. 3 is a schematic structural diagram of a second circuit board in the embodiment of the spherical NFC antenna device according to the present invention.

Fig. 4 is a schematic structural diagram of a third circuit board in the spherical NFC antenna device according to the embodiment of the present invention.

Fig. 5 is a circuit diagram of a chip connected in series with each coil in a spherical NFC antenna device embodiment of the invention.

Fig. 6 is a schematic structural diagram of the spherical NFC antenna device according to the embodiment of the present invention, which cuts magnetic lines of force emitted by the antenna coil of the card reader.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

The smart card comprises a card base and a spherical NFC antenna device, wherein the spherical NFC antenna device is arranged in the card base, and the shape of the card base is of a three-dimensional structure.

Referring to fig. 1 and 2, the spherical NFC antenna device includes a chip 4 and three circular antennas, the three antennas are intersected in pairs and arranged concentrically, the chip 4 is electrically connected to the antennas, the chip 4 is arranged on the inner side of a sphere surrounded by the three antennas, and the chip 4 is a non-contact IC chip.

The three antennas are respectively a first antenna 1, a second antenna 2 and a third antenna 3, and the plane where the first antenna 1 is located, the plane where the second antenna 2 is located and the plane where the third antenna 3 is located are mutually perpendicular in pairs.

The first antenna 1 includes a first circuit board 10 having a circular ring shape, the first circuit board 10 includes a first substrate 11 and a first antenna coil 12, and the first antenna coil 12 is disposed on the first substrate 11.

The second antenna 2 includes two semicircular second circuit boards 20, as shown in fig. 3, the second circuit board 20 includes a second substrate 21 and a plurality of semicircular first wires 221 disposed concentrically, the two second substrates 21 are fixedly connected into a circular ring, the end portion 201 and the end portion 201 of the second circuit board 20 are both fixedly connected with the first circuit board 10, and the first wires 221 are correspondingly connected to form a circular second antenna coil 22.

The third antenna 3 includes four third circuit boards 30 connected end to end in sequence, the four third circuit boards 30 are all in a quarter circular arc shape, as shown in fig. 4, the third circuit board 30 includes a third substrate 31 and a plurality of semicircular second wires 321 arranged concentrically, the four third substrates 31 are fixedly connected in sequence into a circular ring shape, two ends of the third circuit board 30 are fixedly connected with the first circuit board 10 and the second circuit board 20 respectively, and the second wires 321 on the four third circuit boards 30 are correspondingly connected to form a circular third antenna coil 32.

A first relief groove (not shown) penetrating the first substrate 11 in the thickness direction is formed at a position intersecting the second substrate 21 on the first substrate 11, the second antenna coil 22 passes through the first relief groove, a second relief groove (not shown) penetrating the first substrate 11 in the thickness direction is formed at a position intersecting the third substrate 31 on the first substrate 11, the third antenna coil 32 passes through the second relief groove, a third relief groove 211 penetrating the second substrate 21 in the thickness direction is formed at a position intersecting the first substrate 11 on the second substrate 21, the first antenna coil 12 passes through the third relief groove 211, a fourth relief groove 212 penetrating the second substrate 21 in the thickness direction is formed at a position intersecting the third substrate 31 on the second substrate 21, the third antenna coil 32 passes through the fourth relief groove 212, a fifth relief groove 311 penetrating the third substrate 31 in the thickness direction is formed at a position intersecting the first substrate 11 on the third substrate 31, the first antenna coil 12 passes through the fifth recess 311, a sixth recess 312 penetrating the third substrate 31 in the thickness direction is formed at a position on the third substrate 31 intersecting the second substrate 21, and the second antenna coil 22 passes through the sixth recess 312.

One of the third circuit boards 30 is provided with a chip mounting board 301, the chip mounting board 301 extends from one end of the third circuit board 30 to a central axis of the third antenna 3 along a radial direction of the third antenna 3, and the chip 4 is mounted on the chip mounting board 301 and electrically connected to the third circuit board 30.

Referring to fig. 5 and 6, the first antenna coil 12, the second antenna coil 22 and the third antenna coil 32 are connected in series. A series connection can achieve a higher voltage than a parallel connection at the same energy, while a parallel connection can achieve a higher current than a series connection. The trigger condition of the chip 4 is voltage trigger, and the current needs to be very weak, so the serial connection can obtain the voltage capable of triggering the chip 4 under the condition that the signal is very weak, the communication is more sensitive, and the chip 4 is more easily sensed by the card reader 5.

From top to bottom, through two liang of crossings of three antenna for the whole globular that is of NFC antenna device, no matter be from which angle approach the card reader like this, the homoenergetic is responded to. Meanwhile, the spherical NFC antenna device is compact in overall structure and beneficial to miniaturization due to the fact that the spherical NFC antenna device is arranged in a spherical mode. And no matter which angle the card reader is approached to, at least one antenna can be ensured to cut the magnetic force lines emitted by the coil of the card reader, so that the card reading energy and the signal intensity are ensured, and the chip is awakened to work. Two liang of verticals of three antenna, when each antenna cutting magnetic line of force, spherical NFC antenna device all can guarantee to obtain the biggest response signal no matter when being close to the card reader with any direction to guarantee the stability of chip work. And the three antennas are vertically connected in pairs into a sphere, so that the coverage angle is large, and the energy distribution is more uniform.

In addition, the antenna coil can also be formed by winding enameled wires. The three antenna coils may also be connected in parallel or in series-parallel. The number of the antenna coils may be three or more. The first antenna may have the same structure as the second antenna, that is, may be formed of two semicircular first circuit boards. The above-described modifications also achieve the object of the present invention.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.