Abstract: An electronic device includes a first body, a second body and a hinge structure. The hinge structure includes a shaft, a bracket, a torsion assembly and a first washer. The shaft is fixed to the first body. The bracket is fixed to the second body and rotatably connected to the shaft. The bracket includes two assembling portions fixed to each other. The torsion assembly is disposed on the shaft and provides torsion to the hinge structure. The first washer is fixed to the shaft and located between the two assembling portions. Two sides of the first washer contact the two assembling portions respectively to increase the torsion of the hinge structure through the frictional force between the first washer and the two assembling portions.

Abstract: A housing with ball-joints includes a rotatable member, a main body and two ball-joints. Each of the ball-joints includes a ball head and a corresponding shaft hole. The ball-joints are received in the shaft holes correspondingly. Each ball head is formed by two hemispherical elements. One of the hemispherical elements is smaller than the other, and a bottom of the smaller hemispherical element is connected to a top portion of the larger hemispherical element, Where the hemispherical elements meet, a ring-shaped intersection line is formed.