Patent ID: 7977806
Filing Date: 2011-07-12
Classification: H02K

Abstract:
1. A portable electronic device comprising: a case; a revolution body rotatable with respect to the case, a center of gravity of the revolution body being eccentric from an axis of rotation of the revolution body; an electric generator to convert rotational kinetic energy of the revolution body due to a rotation of the revolution body relative to the case into electrical energy; a gear assembly connecting the electric generator and the revolution body to transfer a rotational force due to the rotation of the revolution body to the electric generator, and comprising at least one gear; and a secondary cell to store the electrical energy generated by the electric generator, wherein the revolution body includes a first revolution body member and a second revolution body member that are coupled to each other on opposite sides of the case, respectively, and the gear assembly, the electric generator and the secondary cell are disposed in the case.