| CPC H05K 7/20336 (2013.01) [G06F 1/1656 (2013.01); G06F 1/203 (2013.01); G06F 1/206 (2013.01); H05K 7/2039 (2013.01); H05K 9/0007 (2013.01)] | 10 Claims |

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1. A handheld electronic device, comprising:
a screen;
a back cover;
a frame, arranged between the screen and the back cover, wherein the frame and the back cover define a space;
a main board, arranged in the space, and comprising a front surface and a back surface, wherein the front surface faces the screen, and the front surface comprises a heat source; and
a heat conduction structure, extending from the front surface to the back surface, and comprising a first end and a second end opposite to each other, wherein the first end is arranged at the heat source, and the second end extends to the back cover,
wherein the frame comprises a side wall and a supporting portion, the supporting portion extends inward from the side wall, the supporting portion comprises a first opening, and the first end is embedded into the first opening.
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