TW202231003A - Miniaturized near-field communication device and wearable device thereof capable of enhancing coupling capability between NFC tag and NFC reader and further miniaturizing antenna size of passive NFC tag - Google Patents

Abstract

The invention discloses a miniaturized near-field communication device and a wearable device applying the same. The miniaturized near-field communication device comprises: a shell, an isolation member, a sensing antenna and a near-field communication module, wherein the sensing antenna is disposed in a receiving chamber of the shell and the isolation member is disposed in the receiving chamber. In which, the wall of the shell includes two through holes communicated to the receiving chamber, and both ends of the isolation member are respectively communicated with the corresponding through holes. Thus, the near-field communication device may realize the purpose of miniaturization and may be applied to a wearable device.

Description

Miniaturized near field communication device and wearable device thereof

The present invention relates to a near field communication device and its application, and more particularly, to a miniaturized near field communication device and a wearable device thereof.

With the development of near-field communication (NFC) technology, passive passive NFC tags can be resonated in the alternating magnetic field of the NFC reader, which is equivalent to the antenna connected to the NFC reader. A resistor on the loop, and the change in the resistance value of this resistor can be caused by the antenna load on the passive NFC tag, which in turn can generate a current change on the antenna resonant circuit of the NFC reader, and based on this, the NFC reader Decodes messages sent by passive NFC tags.

However, when the antenna size of the passive NFC tag is smaller, it will affect the coupling state between the NFC reader and the antenna of the passive NFC tag. When the antenna of the passive NFC tag cannot be in the antenna resonant circuit of the NFC reader When there is a sufficient current change on the NFC reader, the message sent by the passive NFC tag will not be able to be interpreted.

One of the objectives of the present invention is to improve the coupling ability between the NFC tag and the NFC reader, and to further miniaturize the size of the antenna of the passively induced passive NFC tag.

Another object of the present invention is to enable passively induced passive NFC tags to be applied to wearable devices.

In order to achieve the above object and other objects, the present invention provides a miniaturized near field communication device, comprising: a casing, an induction antenna and a near field communication module. An accommodating cavity is defined inside the shell. The induction antenna is disposed in the accommodating cavity and is spirally stacked around an axis in a direction defined as near-field induction, wherein the induction antenna defines a first plane in the middle of the height of the stack. The near field communication module is disposed in the accommodating cavity and coupled to the sensing antenna, wherein the near field communication module is located at the axis, and a second plane is defined in the middle of the height of the substrate of the near field communication module, The second plane is offset from the first plane.

In an embodiment of the present invention, the height of the stack of sensing antennas is H, and the second plane may be deviated from the first plane by a distance of at least H/4 or at least H/2.

In one embodiment of the present invention, the near field communication module includes a safety element on the substrate and a matching circuit, and the matching circuit has a first matching capacitor connected in series with the safety element and a first matching capacitor connected in parallel with the safety element. The second matching capacitor. The capacitance value of the second matching capacitor may be 2-3 times the capacitance value of the first matching capacitor. The equivalent inductance value of the induction antenna can be 5uH~6uH.

In an embodiment of the present invention, the surrounding area of the inductive antennas stacked in a spiral manner on the first plane may range from 1.1 to 2.3 square centimeters.

In an embodiment of the present invention, it further includes: a spacer. The spacer is disposed in the accommodating cavity, wherein the wall surface of the housing includes two through holes communicating with the accommodating cavity, and two ends of the spacer are respectively connected with the corresponding two through holes.

In an embodiment of the present invention, the spacer can be a hollow tube.

In one embodiment of the present invention, a part of the sensing antenna may be helically stacked under the spacer, and the rest of the inductive antenna correspondingly has a concave part adjacent to the spacer that circumvents the lower edge of the spacer. Wherein, the induction antenna is recessed downward toward the axis side at each of the concave portions to form a notch.

In an embodiment of the present invention, the surrounding area of the sensing antenna on the first plane may be between 1.13 and 1.54 cm2, and the concave depth of each of the recesses may be between 0.115 and 0.125 cm. In addition, the height of the sensing antenna stack can be between 0.25 and 0.35 cm;

In an embodiment of the present invention, the lower edge of the spacer has a leading R angle, wherein the leading R angle is such that the lower edge of the spacer can be arranged in the upper notch with a width of 0.25 cm and the lower concave of the notch. In this notch with a mouth width of 0.15 cm.

In an embodiment of the present invention, the near field communication module may be disposed below the isolation element and the sensing antenna. The inner wall of the casing has a groove, and the two ends of the induction antenna are arranged in the groove, so as to extend downward to be coupled to the near field communication module.

In order to achieve the above object and other objects, the present invention further proposes a wearable device for wearing on the neck or wrist, comprising: the aforementioned miniaturized near field communication device and a serial connection unit. The outer shape of the casing of the miniaturized near field communication device is cross-shaped, and the accommodating cavity of the miniaturized near field communication device defines a rectangular cavity by the shell wall of the casing. The induction antenna of the communication device surrounds an axis along the shell wall of the casing. The serial unit passes through one end of the cross-shaped casing, wherein the upper and lower sides of the near field communication module in the miniaturized near field communication device are both directions of near field sensing.

In an embodiment of the present invention, the rectangular cavity may further include two isolation blocks protruding from the shell wall, and the middle of the two isolation blocks is configured for the near field communication of the miniaturized near field communication device. In the module, the induction antenna is spirally surrounded between the two isolation blocks and the shell wall.

In order to achieve the above object and other objects, the present invention further proposes a wearable device for wearing on the neck or wrist, comprising: the aforementioned miniaturized near field communication device, a plurality of beads and a serial connection unit. The outer shape of the casing of the miniaturized near field communication device is a sphere. Each of the beads has a perforation therethrough. The serial connection unit passes through the two through holes of the accommodating cavity of the miniaturized near field communication device and through the through holes of each of the beads, wherein the lower part of the near field communication module in the miniature near field communication device is is the direction of near-field sensing.

In an embodiment of the present invention, the inductive antennas in the miniaturized near field communication device, which are helically stacked around the axis, may have 16-17 turns. The stacking height of the sensing antenna is about 3 mm, and the wire diameter of the sensing antenna is about 0.15 mm.

In an embodiment of the present invention, the sphere of the miniaturized near field communication device having a spherical shape has a diameter of about 1.5 cm, and the surrounding area of the sensing antenna in the miniaturized near field communication device on the first plane is equal to About 1.3 square centimeters.

In this way, through the combination of the stacking arrangement of the sensing antennas and the configuration relationship with the near field communication module, the coupling ability between the miniaturized near field communication device and the NFC reader can be improved, and the sensing performance can be improved. The combination of the circuit and the configuration of the sensing antenna corresponding to the size of the cavity allow the near-field communication device to maintain a stable frequency point, and at the same time improve the sensing performance, and further enable passive sensing of passive NFC tags. applied to wearable devices.

In order to fully understand the purpose, features and effects of the present invention, hereby, the present invention is described in detail by the following specific embodiments and in conjunction with the accompanying drawings, and the description is as follows:

In miniaturized near field communication devices, the usable space is usually crowded, narrow or cramped. Therefore, in order to make the near field communication device that obtains operation capability through induction method, it can have sufficient communication capability to read and read with NFC. Data transmission between devices, in an embodiment of the present invention, the specific arrangement of the sensing antenna in structure and the configuration relationship with the near field communication module (or NFC IC) are used to improve the communication with the NFC reader. ability.

Please refer to FIG. 1 , which is a schematic diagram of a configuration relationship between a sensing antenna and a near field communication module according to an embodiment of the present invention. The example of FIG. 1 shows that the sensing antennas 200 surround the axis Z, are vertically stacked upward in a spiral stacking manner, and have a stacking height H. As shown in FIG. Both ends of the sensing antenna 200 are coupled to the near field communication module 300 , and the near field communication module 300 is disposed at the axis Z.

The helical-stacked sensing antenna 200 presents a three-dimensional antenna pattern, wherein the sensing antenna 200 can also be arranged along the wall of the accommodating cavity in the configured miniaturized near-field communication device, that is, the helical-stacked The sensing antennas 200 are not necessarily stacked vertically upward, and can be stacked according to the wall surface of the accommodating cavity to present other shapes (eg, tapering, tapering, or a mixture of wide and narrow shapes). However, the manner of stacking the sensing antennas 200 vertically upwards (the same diameter or a vertical winding stacking manner symmetrical to the axis Z) helps to improve the communication capability with the NFC reader.

In a miniaturized near-field communication device, the helically stacked induction antenna 200 preferably surrounds an area of at least 1.1 square centimeters on a plane in a narrow accommodating cavity. In general wearable devices, it can be configured to surround an area of 1.1-2.3 cm2 (refer to the area A marked in FIG. 2 ) to help the sensing capability of the sensing antenna 200 .

Next, please refer to FIG. 2 , which is a schematic diagram of the arrangement relationship of the sensing antenna and the near field communication module in the vertical direction according to another embodiment of the present invention. The inductive antenna 200 illustrated in FIG. 2 is another inductive antenna 200 of a helical stacking type, the one illustrated in FIG. 1 is surrounded by a circle, and the one illustrated in FIG. 2 is surrounded by a rectangle. In order to facilitate the description of the configuration relationship between the sensing antenna 200 and the near field communication module 300 in the vertical direction, FIG. 2 shows the sensing antenna 200 and the near field communication module 300 respectively, and the near field communication module 300 is not shown in the The middle part (at the axis) of the induction antenna 200 and the induction antenna 200 surrounding the induction antenna 200 in a rectangular shape are schematically shown.

2 is to illustrate that the sensing antenna 200 can define a first plane P1 in the middle of the stack height H, and the second plane P2 can be defined in the middle of the height of the substrate of the near field communication module 300 . The second plane P2 is deviated from the first plane P1, and the degree of deviation D can be at least H/4 or at least H/2 distance, which can further reduce interference, make the frequency point (13.56MHZ) stable and not easy to drift, and help improve the compatibility with Communication capability between NFC readers. Wherein, the deviation degree D is preferably a distance of at least H/2 when the area surrounded by the sensing antenna 200 is less than 1.5 square centimeters.

Next, please refer to FIG. 3 , which is an equivalent circuit diagram of a near field communication module and a sensing antenna according to an embodiment of the present invention. The equivalent circuit diagram includes a safety element 310 and a matching circuit. The matching circuit has a first matching capacitor 321 connected in series with the safety element 310 and a second matching capacitor 322 connected in parallel with the safety element 310 . In order to further enable the miniaturized near field communication device to achieve better impedance matching effect with various NFC readers on the market, the capacitance value of the second matching capacitor 322 is 2.3-2.9 of the capacitance value of the first matching capacitor 321 . In addition, the inductance value corresponding to the coil L of the induction antenna can be 5uH~6uH. Among them, the Security Element (SE) is used to store important user information (such as credit card information, user information, etc.), which can be used in the verification procedure of the near-end wireless payment.

Next, please refer to FIG. 4 , which is a schematic diagram of an exploded structure of a miniaturized near field communication device according to an embodiment of the present invention. FIG. 4 takes the case of the miniaturized near field communication device as a sphere as an example, and at the same time, the top part of the case is omitted as shown in FIG. 4 . Miniaturized Near Field Communication Device In this embodiment, in addition to the casing 100 , the sensing antenna 200 , and the near field communication module 300 , a spacer 400 is further included in the accommodating cavity defined by the casing 100 . , and two through holes 110 are included on the wall surface of the casing 100 , and the two through holes 110 communicate with the accommodating cavity.

The two ends of the spacer 400 are respectively connected to the corresponding through holes 110 , so that the external series connection unit 500 can pass through the two through holes 110 and the spacer 400 smoothly into the housing 100 from one through hole 110 , and pass through the other through the casing 100 smoothly. The hole 110 penetrates out of the casing 100 . At the same time, by the spacer 400 , the serial unit 500 can be guided to pass through the casing 100 , and the serial unit 500 can also be separated from the sensing antenna 200 .

As shown in FIG. 4 , the spacer 400 is a hollow pipe body. In other embodiments, the spacer 400 may also be other structures that can guide the series-connected units 500 to pass through. Below the spacer 400 , where the near field communication module 300 is disposed, the housing 100 can be formed as a spacer wall 140 adapted to the chip size of the near field communication module 300 , so that the sensing antenna 200 can be disposed between the outer wall of the housing 100 and the partition wall 140 .

In the aspect illustrated in FIG. 4 , the direction of near-field sensing is downward, the sensing antenna 200 may be partially spirally stacked below the spacer 400 , and the rest has a recess 210 adjacent to the spacer 400 . The concave portion 210 is used to circumvent the lower edge of the spacer 400 . Wherein, the near field communication module 300 may be disposed below the isolation member 400 and the sensing antenna 200 .

Next, please refer to FIG. 4 and FIG. 5 . FIG. 5 is a schematic structural diagram of an induction antenna according to an embodiment of the present invention. The sensing antenna 200 has the aforementioned concave portion 210 , the concave portion 210 has a notch, and the notch is concave downward toward the axis side (ie, the surrounding central axis), that is, the two recesses of the sensing antenna 200 The portion 210 is concave in a direction opposite to the wall surface of the adjacent accommodating cavity. The size of the sensing antenna 200 in the miniaturized near-field communication device, in one embodiment, the concave depth dp of each of the notch (also refer to FIG. 6 ) is between 0.115 and 0.125 cm. The sensing antenna 200 is stacked. The height H is between 0.25-0.35 cm, and in this state, the surrounding area of the sensing antenna 200 on the first plane P1 (refer to FIG. 1 ) is between 1.13-1.54 cm2. Wherein, the wire body of the induction antenna 200 may be an enameled wire insulated single-core wire or other wires.

As shown in FIG. 4 , the inner wall of the housing 200 has a groove 220 which is concave downward. Both ends of the sensing antenna 200 are disposed in the grooves 220 , so as to help the two ends of the sensing antenna 200 to extend downward to be coupled to the field communication module 300 .

Next, please refer to FIG. 6 , which is a schematic diagram of the configuration relationship between the lower edge of the spacer and the sensing antenna according to an embodiment of the present invention. The lower edge of the spacer 400 may have a leading R angle 410, and the leading R angle of the leading R angle 410 is such that the lower edge of the spacer 400 can be arranged in the notch of the recessed portion 210, wherein, please refer to FIG. 5, the The upper notch width W1 of the notch is 0.25 cm, and the lower notch width W2 of the notch is 0.15 cm.

Next, please refer to FIG. 7 , which is a schematic diagram of a wearable device applied to a miniaturized near field communication device having a cross shape according to an embodiment of the present invention. FIG. 7 illustrates a wearable device for wearing on the neck or wrist, including a miniaturized near field communication device with a cross shape and a serial connection unit 500 . The accommodating cavity of the miniaturized near field communication device can define a rectangular cavity by the shell wall of the casing 100 , and the sensing antenna 200 surrounds a central axis along the shell wall of the casing 100 .

The rectangular cavity accommodates the spirally stacked sensing antenna 200 and the near field communication module 300, and further includes two isolation blocks 120 protruding from the shell wall, wherein the near field communication module 300 is configured In the middle portion of the two isolation blocks 120, in the groove between the two isolation blocks 120 and the shell wall, the induction antenna 200 is helically stacked. In the example of FIG. 7 , the directions ( Z1 and Z2 ) of the near-field sensing can be both above and below the near-field communication module 300 , and the area A (refer to FIG. 2 ) surrounded by the sensing antenna on a plane can be configured as Between 1.8~2.2 square centimeters, to help improve communication capabilities.

Next, please refer to FIG. 8 , which is a schematic diagram of a wearable device applied to a miniaturized near field communication device having a spherical shape according to an embodiment of the present invention. FIG. 8 illustrates a wearable device to be worn on the neck or wrist, including: a miniaturized near field communication device in the shape of a spherical casing 100 , a plurality of beads 130 , and a serial connection unit 500 . 4 to 6 , the accommodating cavity of the miniaturized near field communication device can define a spherical cavity by the shell wall of the casing 100 , and the sensing antenna 200 is surrounded along the shell wall of the casing 100 . The bottom of the near field communication module in the miniaturized near field communication device is the direction of near field sensing. The stacking height H of the sensing antennas 200 can be configured to be about 3 mm, and the wire diameter of the sensing antennas 200 is about 0.15 mm.

In the example of FIG. 8 , the sphere of the miniaturized near field communication device has a diameter of about 1.5 cm, the surrounding area of the induction antenna in the miniaturized near field communication device on a plane is about 1.3 cm2, and the spirally stacked The inductive antenna may then be configured to have a number of turns of at least 15 turns. In addition, a mark 150 can also be printed on the outside of the casing 100 to mark the near-field sensing direction (refer to the axis Z in FIG. 4 at the same time), so as to guide the user to conduct sensing on this side.

The "about" refers to a configuration that has a degree of difference within 2% of the stated value, and is within the range of "+2% to -2%".

In view of the above, the embodiments of the present invention illustrate configurations that can be performed in a miniaturized near-field communication device. The sensing performance can be improved by the configuration relationship of the sensing antenna, the near-field communication module, and the arrangement of the sensing antenna structure. Further, passive sensing of passive NFC tags can be applied to wearable devices.

The present invention has been disclosed above with preferred embodiments, but those skilled in the art should understand that the embodiments are only used to describe the present invention, and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to this embodiment should be considered to be included within the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the patent application.

100: Shell 110: Through hole 120: Isolation Block 130: beads 140: Separation Wall 150:mark 200: Induction Antenna 210: Depression 220: Groove 300: Near Field Communication Module 400: Spacer 410: Lead R angle 500: tandem unit A: The area surrounded by the induction antenna on a plane D: degree of deviation dp: concave depth H: The stacking height of the sensing antenna L: Coil of induction antenna P1: first plane P2: Second plane Z: axis Z1: axis Z2: axis W1: Upper notch width W2: lower notch width

FIG. 1 is a schematic diagram of the configuration relationship between the sensing antenna and the near field communication module according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the arrangement relationship between the sensing antenna and the near field communication module in the vertical direction according to another embodiment of the present invention. 3 is an equivalent circuit diagram of a near field communication module and a sensing antenna according to an embodiment of the present invention. 4 is a schematic diagram of an exploded structure of a miniaturized near field communication device according to an embodiment of the present invention. 5 is a schematic structural diagram of an induction antenna according to an embodiment of the present invention. FIG. 6 is a schematic diagram of the configuration relationship between the lower edge of the spacer and the sensing antenna according to an embodiment of the present invention. 7 is a schematic diagram of a wearable device applied to a miniaturized near field communication device having a cross shape according to an embodiment of the present invention. 8 is a schematic diagram of a wearable device applied to a miniaturized near field communication device having a spherical shape according to an embodiment of the present invention.

100: Shell

110: Through hole

140: Separation Wall

200: Induction Antenna

210: Depression

300: Near Field Communication Module

400: Spacer

500: tandem unit

Z: axis

Claims (17)

A miniaturized near field communication device, which is passed through by a series connection unit, comprising: a casing, an accommodating cavity is defined inside the casing, and the wall surface of the casing includes two through holes communicating with the accommodating cavity; A spacer is disposed in the accommodating cavity, and two ends of the spacer are respectively connected to the corresponding two through holes, and the spacer is used to guide the two through holes that pass through the casing. connecting units in series to pass through the casing through the other of the two through holes; an induction antenna disposed in the accommodating cavity; and A near field communication module is disposed in the accommodating cavity and coupled to the sensing antenna. The miniaturized near-field communication device as claimed in claim 1, wherein the sensing antenna is correspondingly formed with a concave portion that bypasses the spacer near the spacer. The miniaturized near-field communication device as claimed in claim 2, wherein each of the recessed portions of the sensing antenna has a recess extending in a direction away from the wall surface of the housing and recessed downward to form a recess around the lower edge of the spacer mouth. The miniaturized near field communication device according to claim 3, wherein the concave depth of each of the notches is between 0.115 and 0.125 cm. The miniaturized near-field communication device according to claim 4, wherein the sensing antennas are helically stacked in the accommodating cavity, and the stacking height is between 0.25 and 0.35 cm. The miniaturized near field communication device according to any one of claims 1 to 5, wherein the spacer is a hollow tube. The miniaturized near field communication device as claimed in claim 6, wherein a leading R angle is provided at the lower edge of the spacer adjacent to the sensing antenna. The miniaturized near field communication device as claimed in claim 7, wherein the leading R angle is used to make the lower edge of the spacer be arranged in each of the recesses with an upper notch width of 0.25 cm and a lower notch width of 0.15 cm in the mouth. The miniaturized near field communication device as claimed in claim 6, wherein the near field communication module is disposed below the spacer and the sensing antenna. The miniaturized near field communication device as claimed in claim 6, wherein the accommodating cavity has a partition wall adapted to the size of the near field communication module, and the partition wall and the wall surface of the casing are connected with each other. Configuration for this induction antenna. The miniaturized near field communication device as claimed in claim 6, wherein the inner wall of the casing has a groove, and both ends of the sensing antenna are disposed in the groove to extend to couple with the near field communication module. A wearable device comprising: A miniaturized near field communication device as claimed in any one of claims 1 to 11; a plurality of beads, each having a perforation therethrough; and A serial connection unit passes through the two through holes of the accommodating cavity of the miniaturized near field communication device and through the through holes of each of the beads. The wearable device according to claim 12, wherein a near field sensing direction is located below the near field communication module in the miniaturized near field communication device. The wearable device of claim 12, wherein the helically stacked inductive antenna in the miniaturized near field communication device has at least 15 turns. The wearable device of claim 14, wherein the stacking height of the sensing antenna is about 3 mm, and the wire diameter of the sensing antenna is about 0.15 mm. The wearable device according to any one of claims 12 to 15, wherein the outer shape of the casing of the miniaturized near field communication device is a sphere. The wearable device of claim 16, wherein the miniaturized near field communication device having a spherical shape has a diameter of about 1.5 cm.

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