| 摘要 |
<p>@ An incandescent lamp, which emits infra-red radiation, comprises a tubular quartz envelope (1), within which a tungsten filament (2) is supported. To reflect radiation, which is emitted in a downward direction from the filament (2), back in an upward direction to an item to be heated, a substantially pure aluminium oxide coating (6) is bonded in a substantially permanent manner to the surface of the envelope (1). The coating (6) extends substantially along the length of the lamp and around approximately half of the cross-sectional circumference thereof. The coating (6) is applied to the envelope (1) by a spray gun technique, wherein finely divided aluminium powder is blown through an oxygenated flame, which is directed towards an area of the envelope (1) to be coated.</p> |
