| 摘要 |
A lamp includes a housing, a heat sink, a light emitter, a fan and a blocking ring. The housing has an air inlet portion and an air outlet portion formed in a wall of the housing. The heat sink includes a base plate and a plurality of fins surrounding the base plate to define a compartment. Each of the fins have a first end facing the air inlet portion of the housing and a second end connecting with the base plate. The light emitter is fixed to the base plate of the heat sink. The fan is fixed inside the compartment of the heat sink. The blocking ring is mounted between the air inlet portion and the heat sink. Accordingly, the blocking ring blocks part of the heated airflow from flowing back to the air inlet portion and turbulence is avoided effectively. Therefore, the airflow inside the housing can flow smoothly through the air outlet to transfer heat to the environment and heat dissipating efficiency is enhanced. |
