External device of mobile terminal

[0017] Embodiment 1. In order to solve the above-mentioned pin connection problem between the NFC chip and the SIM card, in specific implementation, the inventor considers that the SIM card tray of the mobile terminal (such as Iphone5) needs to be improved, such as figure 2 As shown, the external device of the mobile terminal in this embodiment includes: a SIM card holder 22 that can carry a SIM card 21 of the mobile terminal and can be inserted into the SIM card slot of the mobile terminal, an NFC chip 23, and an NFC antenna 24; among them, the SIM The card tray 22 leads the C1 pin 211, C5 pin 212 and C6 pin 213 of the SIM card 21 of the mobile terminal to the outer wall of the SIM card tray 22, and forms corresponding three internal contacts respectively 221, 222, 223, that is, C1 pin 211 corresponds to internal contact 221, C5 pin 212 corresponds to internal contact 222, C6 pin 213 corresponds to internal contact 223; C1 pin 211, C5 pin 212 and C6 pin 213 pass the corresponding The internal contact is connected to the NFC chip 23, and the NFC antenna 24 is connected to the NFC chip 23.

[0018] Embodiment 2. In order to facilitate the pin connection of the NFC chip and the SIM card, see image 3 As shown, this embodiment is optimized on the basis of embodiment 1, which includes: a SIM card holder 32 that can carry a SIM card 31 of a mobile terminal and can be inserted into the SIM card slot of the mobile terminal, an NFC chip 33, and NFC Antenna 34; Among them, the NFC chip 33 and the NFC antenna 34 are integrated on a housing 35 that matches the mobile terminal, and the housing 35 is also provided with three external contacts connected to the NFC chip 33, namely 351, 352, and 353. The SIM card tray 32 leads the C1 pin 311, C5 pin 312, and C6 pin 313 of the mobile terminal SIM card 31 to the outer wall of the SIM card tray 32, and forms corresponding three internal contacts 321 and 322 respectively. , 323, that is, the C1 pin 311 corresponds to the internal contact 321, the C5 pin 312 corresponds to the internal contact 322, and the C6 pin 313 corresponds to the internal contact 323. Since the shell 35 matches the mobile terminal, in this embodiment, the three external contacts are designed to correspond to the three internal contacts. When the mobile terminal is connected to the shell 5, the external contacts and the corresponding internal contacts are respectively Connected, that is, the external contact 351 is in contact with the internal contact 321, the external contact 352 is in contact with the internal contact 322, and the external contact 353 is in contact with the internal contact 323. In a specific process, the housing 5 may include: a flexible PCB board 354 and a dielectric housing 355. Wherein, the upper and lower sides of the flexible PCB 354 are provided with copper-laid areas 356, and the three external contacts and the NFC antenna 34 are connected to the NFC chip 33 through printed copper wires or FPC lines in the copper-laid areas 356. The copper-plated area 356 of the flexible PCB 354 is etched as the NFC antenna 34, which can enhance the signal strength and save components. Finally, the flexible PCB board 354 is pressed in the middle of the dielectric housing 355. Using the housing 35 (such as a mobile phone protective shell) and the modified SIM card tray 32 of this embodiment, a mobile terminal without NFC function can realize the function of the NFC-SWP technical solution.