TWI782543B - Radio-frequency identification (rfid) device thereof - Google Patents

Abstract

The present invention disclosed a radio-frequency identification (RFID) device. The RFID device comprises a protective casing and a RFID circuit unit situated inside the protective casing. The RFID circuit unit comprises a substrate, a microchip disposed on the substrate, and an antenna. A front surface of the substrate faces a top surface of the protective casing; a back surface of the substrate faces a bottom surface of the protective casing. The antenna comprises a first side surface and a second side surface opposing each other, the first side surface faces the top surface of the protective casing, and the second side surface faces the front surface of the substrate. When the protective casing is inserted into an opening of a metal object and having its top surface facing the opening, the sensitivity of the electronic signal can be increased from having the first side surface of the antenna facing the top surface of the protective casing.

Description

radio frequency identification device

The invention relates to a radio frequency identification device, in particular to a radio frequency identification device suitable for being installed on metal objects.

One of the issues faced when placing a radio frequency identification tag (RFID Tag) on a metal object is how to reduce metal interference, or how to improve the electromagnetic signal induction or transceiving capability of the radio frequency identification tag. In response to this subject, the inventor has previously proposed a radio frequency identification device applicable to metal objects, such as Taiwan I685287 patent and Taiwan Publication No. 202009796 patent. , has always been the inventor's pursuit.

The invention provides a radio frequency identification device, which includes a protective body and a radio frequency identification circuit unit located in the protective body. The radio frequency identification circuit unit includes a circuit board, and a radio frequency identification chip and an induction coil (which can be regarded as an antenna) arranged on the circuit board. The circuit board has a front side, a back side and a first side and a second side opposite to each other. The front side of the circuit board faces the top surface of the protection body, the back side of the circuit board faces the bottom surface of the protection body, and the first side and the second side of the circuit board are respectively exposed to the protection body the cylinder. The cylindrical surface of the protective body further includes a fracture surface, the fracture surface is located above the second side of the circuit board and adjacent to the second side.

In one embodiment, the induction coil is located on the front side of the circuit board, the induction coil has a first side and a second side opposite to each other, and the first side faces the top surface of the protective body, and the first side faces the top surface of the protection body. The two sides face the front side of the circuit board.

Preferably, the distance between the first side and the top surface of the protective body is less than or equal to 1 mm, preferably less than or equal to 0.5 mm.

In one embodiment, the protection body of the radio frequency identification device of the present invention includes an inner protection body covering the radio frequency identification chip and an outer protection body covering the inner protection body, the circuit board and the induction coil, and The material of the inner protection body is insulating protective glue, and the material of the outer protection body is plastic material or rubber material.

In one embodiment, the radio frequency identification circuit unit of the radio frequency identification device of the present invention includes an iron core fixed on the front side of the circuit board, the iron core includes an intermediate connecting column and two sides respectively connected to the two ends of the intermediate connecting column block, the induction coil is located between the two side blocks and surrounds the middle connecting column, and the two ends of the induction coil are respectively connected to the solder on the two side blocks, and the iron core is welded to the circuit board by the solder The front.

In one embodiment, the induction coil of the radio frequency identification device of the present invention has a third side and a fourth side opposite to each other, the third side is adjacent to the first side, and the second side is adjacent to the third side and is located at Opposite to the first side, the fourth side is adjacent to the second side and opposite to the third side, the third side and the fourth side are respectively facing the cylindrical surface of the protective body, wherein the first The side is wider than the third side.

FIG. 1 and FIG. 2 show a preferred embodiment of the radio frequency identification device of the present invention, which includes a protective body 3 and a radio frequency identification circuit unit 2 inside the protective body 3 . The protective body 3 has a bottom surface 30 , a top surface 31 , and a cylindrical surface 32 located between the bottom surface 30 and the top surface 31 . In this embodiment, the diameter of the bottom surface 30 of the protection body 3 is smaller than the diameter of the top surface 31 of the protection body 3 , and the portion of the protection body 3 close to the bottom surface 30 tapers downward to form a conical section.

As shown in FIGS. 3 to 5 , the radio frequency identification circuit unit 2 includes a circuit board 12 and an induction coil 21 . The circuit board 12 has a front side 121 , a back side 122 , and a first side 123 and a second side 124 opposite to each other.

The induction coil 21 (which can be regarded as an antenna) is disposed on the front surface 121 of the circuit board 12, and the induction coil 21 has a first side 211 and a second side 212 opposite to each other, and a third side 213 and a fourth side 214 opposite to each other. . The third side 213 is adjacent to the first side 211 . The second side 212 is adjacent to the third side 213 and opposite to the first side 211 . The fourth side 214 is adjacent to the second side 212 and opposite to the third side 213 . Wherein, the first side 211 of the induction coil 21 faces the same direction as the front side 121 of the circuit board 12, the third side 213 faces the same direction as the first side 123 of the circuit board 12, and the second side 212 faces the front side of the circuit board 12 121 , the fourth side 214 faces the same direction as the second side 124 of the circuit board 12 . In this embodiment, the length and width of the first side 211 are equal to the second side 212, the length and width of the third side 213 are equal to the fourth side 214, the third side 213 has the same length as the first side 211, and the third side The width of 213 is smaller than that of the first side 211 , in other words, the first side 211 of the induction coil 21 is wider than the third side 213 and wider than the fourth side 214 .

In this embodiment, as shown in FIG. 3 , the RFID circuit unit 2 includes an RFID chip 22 disposed on the back surface 122 of the circuit board 12 . In addition, the radio frequency identification circuit unit 2 may further include an iron core 23 , and as shown in FIG. 2 , the iron core 23 is disposed on the front surface 121 of the circuit board 12 , and the induction coil 21 surrounds the iron core 23 . Among them, the radio frequency identification chip 22 is a radio frequency identification chip in the middle and high frequency bands, and high frequency radio frequency identification chips such as NXP's I-Code-SLI, NTag213, NTag215, NTag216, Mifare, or STMicroelectronics (ST) can be selected. ST25TV512, ST25TV02K, ST25TV16k and other high-frequency radio frequency identification chips, or Temic company's T5777, T5778 and other low-frequency radio frequency identification chips, EM company's EM4102, EM4200, EM4069 and other low-frequency radio frequency identification chips, in this embodiment, select the 13.56MHz frequency band high frequency radio frequency identification chips.

In this embodiment, as shown in FIG. 6 , the protection body 3 further includes an inner protection body 300 covering the RFID chip 22 and an outer protection body 302 covering the inner protection body 300 . The material of the inner protective body 300 is insulating protective glue. The outer protective body 302 is made of non-conductive material, preferably made of plastic material or rubber material, such as injection molding of plastic material with a heat resistance of about 200 degrees Celsius. In this embodiment, the material of the outer protective body 302 can be selected from plastic materials such as ABS, PP, PE, PPN, polyamide with glass fiber added (such as PA6 GF30), etc.

As shown in Figure 6 again, the front side 121 of the circuit board 12 faces the top surface 31 of the protection body 3, the back side 122 of the circuit board 12 faces the bottom surface 30 of the protection body 3, and the first side 123 of the circuit board 12 faces the protection body. The cylindrical surface 32 of the body 3, the first side 211 of the induction coil 21 faces the top surface 31 of the protection body 3, the second side 212 of the induction coil 21 faces the front 121 of the circuit board 12, and the third side 213 of the induction coil 21 and the fourth side 214 respectively face the cylindrical surface 32 of the protective body 3 . Since the RFID circuit unit 2 can be placed horizontally or obliquely in the protective body 3, the "facing" is not limited to the situation shown in the figure, and also includes "facing obliquely".

As shown in Figures 7 and 8, the radio frequency identification device of the present invention is inserted into a cavity 51 of an article 5 during actual use. The article may have a metallic surface or be a metal body, but Not limited thereto, for example, wooden or plastic items may also be used. In this way, the first side 211 of the induction coil 21 is facing the opening 510 of the recess 51, or the first side 211 of the induction coil 21 is facing the outside of the article 5, so that an RFID induction host 6 is easy to read by induction. Take the radio frequency identification chip 22. In this embodiment, the first side 211 of the induction coil 21 is the widest and faces outward, which will improve the induction ability (or the ability to send and receive) of the induction coil 21 to electromagnetic wave signals. In the case that the article 5 has a metal surface or the article 5 is a metal body, the improvement of the induction ability of the induction coil 21 is equivalent to the reduction of metal interference, which can ensure the normal reading of the radio frequency identification chip 22 by the radio frequency identification sensing host 6 and reduce the reading rate. Can not get or read the wrong situation.

As shown in FIG. 9 , a plurality of radio frequency identification circuit units 2 of the present invention protrude from two opposite sides of a substrate 1 . The circuit board 12 of each radio frequency identification circuit unit 2 is a part of the substrate 1, and the substrate 1 is manufactured by a printed circuit board process. After each circuit board 12 in the figure is soldered with the radio frequency identification chip 22 and the iron core 23 (the induction coil 21 has been wound), the substrate 1 shown in FIG. 9 is obtained. Next, perform a packaging operation, that is: cover the insulating protective glue on the RFID chip 22 to form the above-mentioned inner protection body 300, and then make each RFID circuit unit 2 be covered by plastic material by plastic injection. The above-mentioned outer protection body 302 is formed, so that each radio frequency identification circuit unit 2 on the substrate 1 is respectively covered by the above-mentioned protection body 3, and as shown in FIG. 10 , the cylindrical surface 32 of each protection body 3 is Connect to substrate 1. Then, the circuit board 12 of each protective body 3 is disconnected from the substrate 1 to obtain a plurality of radio frequency identification devices as shown in Figures 1 and 6, and the second side of the circuit board 12 of each radio frequency identification device The edges 124 are all exposed to the cylindrical surface 32 of the outer protective body 302 of the protective body 3 .

In this embodiment, the iron core 23 is an I-shaped iron core, and as shown in FIG. Between the two side blocks 232 and around the middle connecting column 231 , two ends of the induction coil 21 are respectively connected to the solder 233 on the two side blocks 232 . The iron core 23 is welded to two pads (not shown) on the front surface 121 of the circuit board 12 by these solders 233, so that the iron core 23 is fixed on the front surface 121 of the circuit board 12, and the induction coil 21 is electrically connected to the RFID chip 22 .

12 to 14 show another preferred embodiment of the radio frequency identification device of the present invention, which is substantially the same as the above-mentioned embodiment, except that the second side 124 of the circuit board 12 is exposed to the post of the protective body 3 In addition to the surface 32, the first side 123 of the circuit board 12 is also exposed to the cylindrical surface 32 of the protective body 3, which is mainly because the substrate 1a used in this another preferred embodiment is different from the result of the above-mentioned embodiment. . More specifically, as shown in FIG. 15 and FIG. 16 , the substrate 1 a is manufactured by a printed circuit board process, and the circuit board 12 of each RFID circuit unit 2 is a part of the substrate 1 . Wherein, the base plate 1a includes a middle board 111a, two side boards 112a respectively located on the two phase sides of the middle board 111a, a plurality of first connecting rods 113a connecting the middle board 111a and one side board 112a, and a plurality of connecting rods 113a connecting the middle board 111a and the other side boards. Each of the first connecting rods 113a of the second connecting rods 114a of the side plate 112a has a wider portion serving as the circuit board 12 , and each of the second connecting rods 114a also has a wider portion serving as the circuit board 12 . The front and back of each circuit board 12 are respectively provided with a core 23 and a radio frequency identification chip 22 , and each core 23 is wound with an induction coil 21 . In this way, each circuit board 12 and the induction coil 21 , the RFID chip 22 and the core 23 on the circuit board 12 constitute a radio frequency identification circuit unit 2 . Next, each radio frequency identification chip 22 is covered with insulating protective glue to form the above-mentioned inner protection body 300, and then, each radio frequency identification circuit unit 2 is respectively covered by plastic material by plastic injection to form the above-mentioned outer protection body 302. In this way, each radio frequency identification circuit unit 2 on the substrate 1a is respectively covered by the above-mentioned protection body 3, and as shown in FIG. 17 , the cylinder surface 32 of each protection body 3 is connected to the substrate 1a. Then, each circuit board 12 is disconnected from the substrate 1a to obtain a plurality of radio frequency identification devices as shown in FIGS. The second sides 124 are all exposed to the cylindrical surface 32 of the protective body 3 .

In this another embodiment, when each outer protective body 302 is injection-molded, a frame 303 is also molded from the plastic material, so that each outer protective body 302 is connected to the frame 303 . When each circuit board 12 is disconnected from the substrate 1a, each outer protective body 302 is also disconnected from the skeleton 303, so that a fracture surface 304 is left on each protective body 3, and the fracture surface 304 is located on the side of the circuit board 12. Above and adjacent to the second side 214 .

The above-mentioned configuration of the substrate 1a can ensure that the circuit board 12 will not be skewed during the above-mentioned injection molding process, and it will be explained as follows: the substrate 1a configured with the above-mentioned radio frequency identification circuit unit 2 is put into a plastic injection mold (not shown in the figure) ), the middle plate 111a and the side plates 112a will be clamped by the upper module and the lower module after the plastic injection mold is closed, so the base plate 1a is stably kept in a horizontal state at this time. After the molten plastic material is injected into the plastic injection mold, the molten plastic material will enter from the through hole 305 of the substrate 1a, and flow into each mold cavity along the internal flow channel of the plastic injection mold, and each mold cavity It is used to form the shape of each outer protective body 302 correspondingly. After the aforementioned plastic injection procedure is completed, the substrate 1a connected with multiple protective bodies 3 can be taken out from the plastic injection mold, as shown in Figure 17, wherein the shape of each skeleton 303 is determined by the internal flow of the plastic injection mold Road, and each frame 303 is connected to four protective bodies 3, but not limited thereto.

In addition, in order to allow the induction coil 21 to have better electromagnetic wave induction capability (or signal transceiving capability), the distance G between the first side 211 (that is, the top surface) of the induction coil 21 and the top surface 31 of the protection body 3 is less than Or equal to 1mm, preferably less than or equal to 0.5mm.

1: Substrate 12: Circuit board 121: front 122: back 123: First side 124: second side 2: RFID circuit unit 21: induction coil 22: RFID chip 23: iron core 211: first side 212: second side 213: The third side 214: The fourth side 231: Intermediate connecting column 232: side block 233: Solder 3: Protector 30: bottom surface 300: inner protective body 302: Outer protective body 303: skeleton 304: fracture surface 305: through hole 31: top surface 32: Cylinder 5: Items 51: pit 510: hole 6: RFID sensing host 1a: Substrate 111a: middle plate 112a: side panel 113a: the first connecting rod 114a: the second connecting rod

Fig. 1 shows a perspective view of a preferred embodiment of the radio frequency identification device of the present invention. Figure 2 shows a top view of the preferred embodiment of the present invention. FIG. 3 shows a perspective view of the radio frequency identification circuit unit of the preferred embodiment of the present invention. FIG. 4 shows the rear view of the radio frequency identification circuit unit of the present invention. Fig. 5 shows another perspective view of the radio frequency identification circuit unit of the present invention Fig. 6 shows the A-A sectional view of the preferred embodiment of the present invention. FIG. 7 and FIG. 8 show the application of the preferred embodiment of the present invention to a metal object. 9 and 10 show a substrate used to fabricate the preferred embodiment of the present invention and its state before and after a packaging operation. Fig. 11 shows a bottom view of the iron core and the induction coil of the preferred embodiment of the present invention. FIG. 12 shows a perspective view of another preferred embodiment of the radio frequency identification device of the present invention. Fig. 13 shows a top view of another preferred embodiment of the present invention. Fig. 14 shows a B-B sectional view of another preferred embodiment of the present invention. 15 to 17 are used to illustrate the manufacturing process of this other preferred embodiment.

12: Circuit board

121: front

123: First side

124: second side

2: RFID circuit unit

3: Protector

30: bottom surface

31: top surface

Claims (10)

A radio frequency identification device, comprising: a protection body having a top surface, a bottom surface, and a cylinder between the top surface and the bottom surface; and a radio frequency identification circuit unit located in the protection body and including a circuit board , and a radio frequency identification chip and an antenna arranged on the circuit board, the circuit board has a front side, a back side and an opposite first side and a second side, the front side of the circuit board faces the The top surface of the protection body, the back surface of the circuit board faces the bottom surface of the protection body, the first side and the second side of the circuit board are respectively exposed to the cylindrical surface of the protection body; wherein, the The antenna is an induction coil, the induction coil is located on the front side of the circuit board, the induction coil has a first side and a second side opposite to each other, and the first side faces the top surface of the protective body, the The second side faces the front side of the circuit board; the cylindrical surface of the protective body further includes a fracture surface, the fracture surface is located above the second side of the circuit board and adjacent to the second side. The radio frequency identification device as claimed in claim 1, wherein the induction coil also has a third side and a fourth side opposite to each other, the third side is adjacent to the first side, and the second side is adjacent to the third side and is located at Opposite to the first side, the fourth side is adjacent to the second side and opposite to the third side, the third side and the fourth side are respectively facing the cylindrical surface of the protective body, wherein the first The side is wider than the third side. The radio frequency identification device as claimed in claim 1, wherein the distance between the first side surface of the induction coil and the top surface of the protection body is less than or equal to 1mm. The radio frequency identification device as claimed in claim 1, wherein the distance between the first side surface of the induction coil and the top surface of the protection body is less than or equal to 0.5mm. The radio frequency identification device as claimed in claim 1, wherein the protection body includes an inner protection body covering the radio frequency identification chip and an outer protection body covering the inner protection body, the circuit board and the antenna, and the inner protection body The material of the protective body is insulating protective glue, and the material of the outer protective body is plastic material or rubber material. The radio frequency identification device as described in any one of claims 1 to 5, wherein the radio frequency identification circuit unit includes an iron core fixed on the front side of the circuit board, the iron core includes an intermediate connecting column and is respectively connected to the intermediate connecting column Two side blocks at both ends, the induction coil is located between the two side blocks and surrounds the middle connecting column, and the two ends of the induction coil are respectively connected to the solder on the two side blocks, and the iron core is welded to the the front side of the circuit board. The radio frequency identification device as claimed in claims 1 to 5, wherein the radio frequency identification circuit unit includes an iron core fixed on the front surface of the circuit board, and the induction coil surrounds the iron core. The radio frequency identification device as claimed in claim 1, wherein the diameter of the bottom surface of the protection body is smaller than the diameter of the top surface of the protection body, and the protection body The portion close to the bottom surface tapers downward to form a conical section, and the radio frequency identification circuit unit is all located above the conical section. A radio frequency identification device, comprising: a protective body having a bottom surface, a top surface, and a cylindrical surface between the bottom surface and the top surface, when the protective body is inserted into a cavity of an article, The top surface of the protective body is exposed at an opening of the concave cavity, and the bottom surface and the cylindrical surface of the protective body are buried in the concave cavity; an iron core is located in the protective body, and the iron core The area of the surface facing the top surface is larger than the area of the surface of the iron core facing the cylindrical surface; and an antenna is located in the protection body and surrounds the iron core. The radio frequency identification device as claimed in item 9, wherein the antenna is an induction coil, the induction coil has a first side facing the top surface of the protective body, and a second side opposite to the first side , a third side facing the cylindrical surface of the protective body, and a fourth side opposite to the third side, the area of the first side is larger than the area of the third side.

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