| 摘要 |
<p>An electric heater (10) includes at least one heater element (12) which is adapted to emit electromagnetic radiation (30) having a first wavelength. A reflector (16) adjacent the heater element reflects radiation from the element, the reflected radiation (32) also having the first wavelength. A portion of the emitted and reflected radiation intersects a heater cover (26), which re-emits that radiation such that the re-emitted radiation (36) has a second wavelength different to the first wavelength. The cover has a plurality of apertures (28) which allow passage of another portion of the incident electromagnetic radiation through the cover, that portion having the first wavelength.</p> |
