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A pivoting apparatus with a shielding function rotatably connects a main body and a folder of a foldable device. The pivoting apparatus includes a flexible printed circuit board (FPCB), a first metal sleeve, and a second metal sleeve. The first metal sleeve is disposed around the FPCB for fixing the

A pivoting apparatus with a shielding function rotatably connects a main body and a folder of a foldable device. The pivoting apparatus includes a flexible printed circuit board (FPCB), a first metal sleeve, and a second metal sleeve. The first metal sleeve is disposed around the FPCB for fixing the first end of FPCB on the main body. The second metal sleeve is disposed around the FPCB for fixing the second end of FPCB on the folder. The first and second metal sleeves are rotatably connected for receiving the FPCB. When the folder is rotated relatively to the main body, the second metal sleeve twists the second end of FPCB relative to the first end of FPCB.

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What is claimed is: 1. A pivoting apparatus with a shielding function for rotatably connecting a main body and a folder of a foldable electronic device, wherein the main body includes a first printed circuit board (first PCB), and the folder includes a second printed circuit board (second PCB), at

What is claimed is: 1. A pivoting apparatus with a shielding function for rotatably connecting a main body and a folder of a foldable electronic device, wherein the main body includes a first printed circuit board (first PCB), and the folder includes a second printed circuit board (second PCB), at least one of the first and second PCBs having a grounding surface, the pivoting apparatus comprises: a flexible printed circuit board (FPCB) for connecting the first PCB and the second PCB; a first metal sleeve for fixing a first end of the FPCB, the first metal sleeve being a curved metal plate and having two openings, the two openings being bounded by the curved metal plate and located at two opposite ends of the first metal sleeve, the first metal sleeve having an annular groove, a first inner surface, a first outer surface, a first sidewall, and a first protruding plate, the first protruding plate disposed on the first sidewall, the first sidewall having a first slit communicating with the two openings; and a second metal sleeve for fixing the second end of the FPCB, the second metal sleeve being a curved metal plate and having two openings, the two openings being bounded by the curved metal plate and located at two opposite ends of the second metal sleeve, the second metal sleeve comprising a second sidewall, a second protruding plate, and a joint ring having a gap, the second protruding plate being disposed on the second sidewall, the second sidewall having a second slit extended from the gap, the two openings communicating through the second slit and the gap, the joint ring having a second inner surface and a second outer surface, the joint ring being alterable in shape to allow the joint ring altered in diameter to enclose or insert into the annular groove, wherein the inner surface of the joint ring contacts with a part of the outer surface of the first metal sleeve on which the annular groove is formed, or the outer surface of the joint ring contacts with a part of the inner surface of the first metal sleeve on which the annular groove is formed, so as to allow the second metal sleeve and the first metal sleeve to be rotatably connected for receiving the FPCB; wherein at least one of the first and second protruding plates connects to the grounding surface, so as allow both first and second metal sleeves to be grounded when being rotatably connected to each other; whereby when the folder is rotated relatively to the main body, the second metal sleeve twists the second end of the FPCB relatively to the first end of the FPCB. 2. The pivoting apparatus according to claim 1, wherein the FPCB is passed through the first slit to be connected with the first PCB. 3. The pivoting apparatus according to claim 1, wherein the second end of the FPCB is passed through the second slit to be connected with the second PCB. 4. The pivoting apparatus according to claim 1, wherein the foldable electronic device is a mobile phone. 5. The pivoting apparatus according to claim 1, wherein the foldable electronic device is a notebook computer. 6. The pivoting apparatus according to claim 1, wherein the foldable electronic device is a digital camera. 7. The pivoting apparatus according to claim 1, wherein the second metal sleeve has smaller thickness than the first metal sleeve. 8. The pivoting apparatus according to claim 2, wherein the first protruding plate and the first side wall are formed a non-circular structure which enables the first metal sleeve to be fixed on the main body when the first metal sleeve rotates relatively to the main body. 9. The pivoting apparatus according to claim 3, wherein the second protruding plate and the second side wall are formed a non-circular structure which enables the second metal sleeve to be fixed on the folder when the second metal sleeve rotates relatively to the folder. 10. The pivoting apparatus according to claim 8, wherein the first protruding plate is adjacent to the first slit and formed monolithically with the first side wall. 11. The pivoting apparatus according to claim 9, wherein the second protruding plate is adjacent to the second slit and formed monolithically with the second side wall. 12. A foldable electronic device, comprising: a main body, including a first printed circuit board (first PCB) and a protruding portion with a non-circular chamber; a folder, including a second printed circuit board (second PCB); and a pivoting apparatus with a shielding function for rotatably connecting the main body and the folder, the pivoting apparatus comprising: a flexible printed circuit board (FPCB) for connecting the first PCB and the second PCB; a first metal sleeve being a curved metal plate and having two openings, the two openings being bounded by the curved metal plate and located at two opposite ends of the first metal sleeve, the first metal sleeve being disposed around the FPCB for holding a first end of the FPCB, the first metal sleeve comprising a first sidewall and a first protruding plate disposed thereon, the first sidewall having a first slit communicating with the two openings, the first protruding plate connecting to a grounding surface of the first PCB, the first protruding plate and the first side wall forming a non-circular structure and being inserted into the non-circular chamber, enabling the first metal sleeve to be fixed on the main body when the folder rotates relatively to the main body; and a second metal sleeve being a curved metal plate and having two openings, the two openings being bounded by the curved metal plate and located at two opposite ends of the second metal sleeve, the second metal sleeve comprising a second side wall having a second slit communicating the two openings, the second metal sleeve being disposed around the FPCB for holding the second end of the FPCB, wherein the second metal sleeve and the first metal sleeve are rotatably connected for receiving the FPCB; whereby when the folder is rotated relatively to the main body, the second metal sleeve twists the second end of the FPCB relatively to the first end of the FPCB. 13. The foldable electronic device according to claim 12, wherein the second metal sleeve comprises a joint ring having a gap, the joint ring is expandable in diameter for enclosing the first metal sleeve. 14. The foldable electronic device according to claim 12, wherein the FPCB is passed through the first slit to be connected with the first PCB. 15. The foldable electronic device according to claim 12, wherein the first protruding plate is adjacent to the first slit and formed monolithically with the first side wall. 16. The foldable electronic device according to claim 12, wherein the second end of the FPCB is passed through the second slit to be connected with the second PCB. 17. The foldable electronic device according to claim 12, wherein the foldable electronic device is a mobile phone. 18. The foldable electronic device according to claim 12, wherein the foldable electronic device is a notebook computer. 19. The foldable electronic device according to claim 12, wherein the foldable electronic device is a digital camera. 20. The foldable electronic device according to claim 13, wherein the first metal sleeve comprises an annular groove for receiving the joint ring. 21. The foldable electronic device according to claim 16, wherein the second metal sleeve further comprises a second protruding plate disposed on the second side wall, and the second protruding plate and the second side wall are formed a non-circular structure which enables the second metal sleeve to be fixed on the folder when the second metal sleeve rotates relatively to the folder. 22. The foldable electronic device according to claim 12, wherein the second protruding plate disposed along the second slit and formed monolithically with the second sidewall.