Patent ID: 7619894
Filing Date: 2009-11-17
Classification: F04D,H05K

Abstract:
1. A heat dissipation device, electrically connected to an intermittent power source, for dissipating heat generated by at least one heat-generating element on a circuit board, the heat dissipation device comprising: at least one coil for receiving the intermittent power source to produce a magnetic field; a support block disposed on the circuit board; and at least one vibrating sheet, having a fixed portion, a movable portion extending from the fixed portion, and a flexible portion jointing between the fixed portion and the movable portion, wherein the fixed portion is fixed on the support block disposed on the circuit board, and the movable portion is suspended over the coil via the flexible portion so that the movable portion flutters periodically under the magnetic force of the magnetic field, so as to produce an airflow, and wherein an area of cross section of the flexible portion is smaller than that of the fixed portion.