| 摘要 |
Cooling means 2 for a lamp 1 comprising a recess to receive a planar lamp 1, a plenum chamber 28 extending generally parallel and spaced from the rear face of the lamp 11 with a plurality of gas outlet orifices 25 situated on its forward wall arranged such that cooling gas emerges through said orifices as jets impinging on the rear face 11 of the lamp. The impinging jets are at an angle to promote efficient heat transfer and may be normal to the rear face of the lamp. The rear face of the lamp may be roughened to break up the boundary layer of air over the its surface. An electrical heating 12 element is supplied warm the lamp initially. Cooling gas is supplied to the plenum chamber via an inlet 23 connected via an air hose to a fan, impeller etc. |
