| 摘要 |
<p>The heating of a lamp casing is reduced in that the casing and the bezel are made of a suitably adequately coloured polymer material that absorbs all light in the visible spectral range up to a cut-off wavelength in the border range between the visible and near infrared spectral range and that only partly absorbs the light in the near and middle infrared spectral range from the said cut-off wavelength on. In the headlamp according to the invention, which is provided with a casing and a bezel made of the polymer coloured in the proposed manner the casing temperature is lower by up to 70 K. By the said reduction in the casing temperature during the lamp operation, the use of a less expensive polymer is made possible. The blurring of the optical lamp surfaces due to condensed vapours of the adhesive is decreased.</p> |
