Abstract: A handheld electronic device is provided, which includes a body and a key layout. The body has a base surface. The key layout is disposed on the base surface of the body and includes a plurality of keys. The key layout is a QWERTY key layout and the keys are adapted for users to press with their left or right thumb while holding the body in single hand or both hands. Each key has a curved surface protruded from the base surface and each curved surface has an inflection point. A distance between two inflection points of the curved surfaces of any two adjacent keys is greater than a distance between two figure centers of the orthogonal projections on the base surface of the curved surfaces of the two adjacent keys.

Abstract: A handheld electronic device including a first body, a second body, a stand, and a transmission module is provided. The second body is slidably connected to the first body. The stand is pivoted to the first body. The transmission module connects between the first body and the second body. When the second body slides relative to the first body, the second body drives the transmission module to move the stand so that the stand is opened and closed relative to the first body.

Abstract: A handheld electronic device including a body and a QWERTY key layout is provided. The body has a case. The QWERTY key layout has a plurality of keys disposed on the case, wherein a fillet is disposed on a corner of each key, and there is a distance of the case between any two adjacent the keys. All the keys are adapted to users to press with their left or right thumb in single hand or both hands while using the handheld electronic device, and a heat conductivity of one of the keys is different from a heat conductivity of another one of the keys.

Abstract: A handheld electronic device is provided, which includes a body and a key layout. The body has a base surface. The key layout is disposed on the base surface of the body and includes a plurality of keys. The key layout is a QWERTY key layout and the keys are adapted for users to press with their left or right thumb while holding the body in single hand or both hands. Each key has a curved surface protruded from the base surface and each curved surface has an inflection point. A distance between two inflection points of the curved surfaces of any two adjacent keys is greater than a distance between two figure centres of the orthogonal projections on the base surface of the curved surfaces of the two adjacent keys.

Abstract: An electronic device is provided, including a first module, a second module, a control module, and a torsion hinge. The second module is rotatably disposed on the first module between a first position and a second position. The control module is slidably disposed on the first module between a third position and a fourth position. When the control module is in the third position, the second module is restricted to rotate with respect to the first module. When the control module is in the fourth position, the second module is released by the control module and rotatable with respect to the first module.

Abstract: A handheld electronic device including a first body, a second body, a stand, and a transmission module is provided. The second body is slidably connected to the first body. The stand is pivoted to the first body. The transmission module connects between the first body and the second body. When the second body slides relative to the first body, the second body drives the transmission module to move the stand so that the stand is opened and closed relative to the first body.

Abstract: A key structure including at least two protruding keys and a key frame is provided. The at least two protruding keys are arrayed adjacently. Each of the at least two protruding keys has a first side edge, a second side edge and a protrusion. The second side edge is opposite to the first side edge. The protrusion has a curved-convex surface, a first side surface and a second side surface. The curved-convex surface is getting protruding inwardly from the first side edge and the second side edge. The top end of the curved-convex surface has a crest line. The first side surface passes through the end points of the first side edge, the second side edge and the crest line in the same side. The second side surface is opposite to the first side surface. The key frame is used for carrying the at least two protruding keys.

Abstract: An electronic device is provided, including a first module, a second module, a control module, and a torsion hinge. The second module is rotatably disposed on the first module between a first position and a second position. The control module is slidably disposed on the first module between a third position and a fourth position. When the control module is in the third position, the second module is restricted to rotate with respect to the first module. When the control module is in the fourth position, the second module is released by the control module and rotatable with respect to the first module.

Abstract: A key structure including at least two protruding keys and a key frame is provided. The at least two protruding keys are arrayed adjacently. Each of the at least two protruding keys has a first side edge, a second side edge and a protrusion. The second side edge is opposite to the first side edge. The protrusion has a curved-convex surface, a first side surface and a second side surface. The curved-convex surface is getting protruding inwardly from the first side edge and the second side edge. The top end of the curved-convex surface has a crest line. The first side surface passes through the end points of the first side edge, the second side edge and the crest line in the same side. The second side surface is opposite to the first side surface. The key frame is used for carrying the at least two protruding keys.