Unidirectional RFID antenna module and thermal printer

Abstract

The RFID antenna module comprises a shell, a metal shielding shell, a transmitting antenna, a cover plate and aluminum foil paper, a first mounting groove is formed in the upper portion of the shell in the width direction of the paper, a second mounting groove is formed in the upper surface of the metal shielding shell in the width direction of the paper, the metal shielding shell is mounted in the first mounting groove, and the transmitting antenna is mounted in the second mounting groove. The transmitting antenna is mounted in the second mounting groove, the cover plate is made of a non-metal material, covers the first mounting groove and is located on the outer side of the transmitting antenna, the aluminum-foil paper is attached to the inner end face of the cover plate, a through hole is formed in the aluminum-foil paper in a penetrating mode in the paper width direction, and the through hole is opposite to the transmitting antenna. According to the scheme, three-face metal shielding is utilized, the one-way emission performance of the antenna is improved, the antenna is suitable for ultra-near-field RFID identification, the anti-collision capacity of the tag is greatly improved, and the antenna has good one-way directivity.

Description

Technical Field

[0001] The utility model relates to the field of thermal printing, in particular to a unidirectional RFID antenna module and a thermal printer. Background Art

[0002] With the popularization of thermal printers, they are not only used in bank ATMs, supermarket cash registers and e-commerce delivery offices, but are also widely used in the textile field or product labeling field, especially labels with RFID antennas. Labels with RFID antennas can print product information through thermal printers while using the antenna to write information at the same time.

[0003] The antenna in the prior art is directly placed on the plastic housing without limiting the shielding or direction of the antenna. Since the antenna has a wide divergence and instability, it is easy to cause confusion in the reading and writing of tag information when reading and writing RFID tags, affecting the reading and writing stability of the tag. Utility Model Content

[0004] The first object of the utility model is to provide a unidirectional RFID antenna module.

[0005] The second object of the utility model is to provide a thermal printer having the above RFID antenna module.

[0006] In order to achieve the first purpose of the utility model, the utility model provides a unidirectional RFID antenna module, including a shell, a metal shielding shell, a transmitting antenna, a cover plate and aluminum foil paper, a first installation groove is arranged on the top of the shell along the paper width direction, a second installation groove is arranged on the upper surface of the metal shielding shell along the paper width direction, the metal shielding shell is installed in the first installation groove, the transmitting antenna is installed in the second installation groove, the cover plate is made of non-metallic material, the cover plate covers the outside of the first installation groove and is located on the outside of the transmitting antenna, the aluminum foil paper is attached to the inner end surface of the cover plate, and the aluminum foil paper is provided with a through hole along the paper width direction, and the through hole is opposite to the transmitting antenna.

[0007] A further solution is that the edge of the aluminum foil is located outside the transmitting antenna.

[0008] A further solution is that the area of ​​the through hole is smaller than the area of ​​the transmitting antenna.

[0009] A further solution is that the housing is provided with saw teeth on the front side of the first mounting slot based on the paper output direction.

[0010] A further solution is that the shell is provided with a grounding hole, and the metal shielding shell is connected to the grounding hole through a grounding wire.

[0011] A further solution is that the housing is provided with a control circuit board, and the control circuit board is connected to the transmitting antenna via a data line.

[0012] A further solution is that a first through slot is provided at the end of the first installation slot in the paper width direction, and a second through slot is provided at the end of the second installation slot in the paper width direction, the first through slot is connected to the second through slot, and the data line passes through the first through slot and the second through slot to be connected to the transmitting antenna.

[0013] In order to achieve the second purpose of the utility model, the utility model provides a thermal printer, including a rubber roller and a thermal sheet, the thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, a paper outlet is arranged at the front end of the paper feeding channel, the thermal printer also includes an RFID antenna module as described above, and a cover plate is arranged at the front side of the paper outlet and is arranged upward.

[0014] The beneficial effect of the utility model is that the metal shielding shell and aluminum foil paper surround the antenna, so that the electromagnetic wave signal emitted by the antenna can only be emitted from the through hole position, so that the electromagnetic wave signal divergence area and direction can be accurately controlled, so that data can be read and written only for the RFID tag on the current surface. This case uses three-sided metal shielding to improve the unidirectional emission performance of the antenna, and is suitable for ultra-near-field RFID identification, greatly improving the anti-collision ability of the tag, and has good unidirectional directivity to improve the near-field identification ability. The first through slot and the second through slot located at the end of the paper width direction are used to connect the data line to reduce interference with the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of an embodiment of a thermal printer of the utility model.

[0016] Figure 2 It is a structural diagram of an embodiment of the RFID antenna module of the utility model.

[0017] Figure 3 It is an exploded view of an embodiment of the RFID antenna module of the utility model.

[0018] Figure 4 It is a schematic diagram of the coordination of the antenna module of the thermal printer embodiment of the utility model.

[0019] Figure 5 It is the antenna radiation pattern of the transmitting antenna in the RFID antenna module of the utility model in an unshielded state.

[0020] Figure 6 It is the antenna radiation pattern of the transmitting antenna in the RFID antenna module of the utility model in the shielded state.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0022] Reference Figures 1 to 4 The thermal printer 11 includes a rubber roller 12, a thermal film 13, a baffle 14 and an RFID antenna module 2. The thermal film 13 and the rubber roller 12 are opposite to each other and form a paper feeding channel. A paper outlet 15 is provided at the front end of the paper feeding channel. The RFID antenna module 2 is arranged at the front end of the paper outlet 15 in the paper feeding direction X, and the baffle 14 covers the outer side of the RFID antenna module 2.

[0023] The RFID antenna module 2 includes a shell 21, a metal shielding shell 22, a transmitting antenna 23, a cover plate 25 and an aluminum foil paper 24. A first mounting groove 211 is arranged above the shell 21 along the paper width direction Y. The first mounting groove 211 is arranged in a T-shape. A first through groove 212 is arranged at the end of the first mounting groove 211 in the paper width direction Y. The shell 21 is provided with a serration 242 on the front side of the first mounting groove 211 based on the paper output direction X.

[0024] A second mounting groove 221 is provided on the upper surface of the metal shielding shell 22 along the paper width direction Y. The second mounting groove 221 is arranged flatly. A second through groove 222 is provided at the end of the second mounting groove 221 in the paper width direction Y. The metal shielding shell 22 is installed in the first mounting groove 211, and the transmitting antenna 23 is arranged horizontally and installed in the second mounting groove 221.

[0025] The cover plate 25 is made of non-metallic material. The cover plate 25 covers the outside of the first installation groove 211 and is located on the outside of the transmitting antenna 23. The aluminum foil 24 is attached to the inner end surface of the cover plate 25. The aluminum foil 24 is penetrated by a through hole 241 along the paper width direction Y. The through hole 241 is opposite to the transmitting antenna 23. The edge of the aluminum foil 24 is located on the outside of the transmitting antenna 23. The area of ​​the through hole 241 is smaller than the area of ​​the transmitting antenna 23.

[0026] The shell 21 is provided with a grounding hole 216, and the metal shielding shell 22 is connected to the grounding hole 216 through a grounding wire 213. The shell 21 is provided with a control circuit board 214, and the first through slot 212 is communicated with the second through slot 222. The data line 215 passes through the first through slot 212 and the second through slot 222 and is connected to the transmitting antenna 23. The cover plate 25 is arranged at the front side of the paper outlet 15 and arranged upward, so that the antenna transmitting antenna 23 is surrounded by a shielding arrangement, and the electromagnetic wave signal emitted by the antenna can only be diverged from the position of the through hole 241, so that the divergence area and direction of the electromagnetic wave signal can be accurately controlled.

[0027] Reference Figure 5 , Figure 5 The antenna radiation pattern of the transmitting antenna 23 in the unshielded state is shown as a divergent state with high uncertainty. Figure 6 , Figure 6It is the antenna radiation pattern of the transmitting antenna 23 in the shielded state, that is, the transmitting antenna 23 is installed in the metal shielding shell 22, and the aluminum foil 24 is arranged on the outside. By using the three-sided metal shielding, most of the electromagnetic wave signals of the antenna 23 are diverged from the position of the through hole 241, thereby improving the unidirectional transmission performance of the antenna.

[0028] As can be seen from the above, by using the metal shielding shell and aluminum foil to surround the antenna, the electromagnetic wave signal emitted by the antenna can only be emitted from the through hole position, so that the electromagnetic wave signal divergence area and direction can be accurately controlled, so that data can be read and written only for the RFID tag on the current surface. This case uses three-sided metal shielding to improve the unidirectional emission performance of the antenna, and is suitable for ultra-near-field RFID identification, greatly improving the anti-collision ability of the tag, and has good unidirectional directivity to improve the near-field identification ability. The first through slot and the second through slot located at the end of the paper width direction are used to connect the data line to reduce interference with the signal.

Claims

1. A unidirectional RFID antenna module, characterized in that: include: A housing, wherein a first mounting groove is provided on the upper side of the housing along the paper width direction; A metal shielding shell, wherein the upper surface of the metal shielding shell is provided with a second mounting groove along the paper width direction, and the metal shielding shell is mounted in the first mounting groove; a transmitting antenna, wherein the transmitting antenna is installed in the second installation groove; A cover plate and aluminum foil, wherein the cover plate is made of non-metallic material, the cover plate covers the outside of the first mounting groove and is located on the outside of the transmitting antenna, the aluminum foil is attached to the inner end surface of the cover plate, and the aluminum foil is provided with through holes along the width direction of the paper, and the through holes are opposite to the transmitting antenna.

2. The RFID antenna module according to claim 1, characterized in that: The edge of the aluminum foil is located outside the transmitting antenna.

3. The RFID antenna module according to claim 2, characterized in that: The area of ​​the through hole is smaller than the area of ​​the transmitting antenna.

4. The RFID antenna module according to claim 1, characterized in that: The housing is provided with saw teeth at a front side of the first mounting groove based on a paper output direction.

5. The RFID antenna module according to claim 1, characterized in that: The shell body is provided with a grounding hole, and the metal shielding shell is connected to the grounding hole through a grounding wire.

6. The RFID antenna module according to any one of claims 1 to 5, characterized in that: The housing is provided with a control circuit board, and the control circuit board is connected to the transmitting antenna via a data line.

7. The RFID antenna module according to claim 6, characterized in that: The first installation slot is provided with a first through slot at the end in the paper width direction, and the second installation slot is provided with a second through slot at the end in the paper width direction. The first through slot is connected to the second through slot, and the data line passes through the first through slot and the second through slot to be connected to the transmitting antenna.

8. A thermal printer, comprising a rubber roller and a thermal sheet, wherein the thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, and a paper outlet is provided at the front end of the paper feeding channel, characterized in that: The thermal printer further comprises an RFID antenna module as claimed in any one of claims 1 to 7, and the cover plate is arranged at the front side of the paper outlet and faces upward.

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