Heat-dissipation device and electronic device thereon

摘要

A heat dissipation device is used for a circuit board, and plural electronic components are mounted on a surface of the circuit board. The heat dissipation device includes a heat dissipation plate that is made of metal. Once the heat dissipation plate shields above a surface of the circuit board, a distance exists between the heat dissipation plate and the surface so as to form an air flow passage to increase the heat dissipation performance.