| 摘要 |
A projector having a closed cylindrical body has a cylindrical skin disposed coaxially within the body to form an annular passageway between the body and the skin. A fan is included within the projector circulating air via passages surrounding the mirrors and long support, and the annular passageway in a closed circuit. The outer cylindrical body has projecting cooling fins removing heat from the air as it circulates in the closed system. |
