| 摘要 |
<p>A low-pressure discharge lamp according to the invention is provided with a radiation-transmitting discharge vessel (10) which encloses a discharge space (12) containing an ionizable filling in a gastight manner, and electrodes (20a, 20b) arranged in the discharge space (12) between which a discharge path extends. At least one of the electrodes (20a, 20b) comprises a sintered mixture of metal (23) and ceramic material (22, 24), the proportional quantity of metal (23) in the mixture being small compared with the proportional quantity of ceramic material (22, 24). The sintered mixture comprises smaller ceramic particles (22) with a modal diameter D1 and larger ceramic particles (24) with a modal diameter D2, the ratio D2/D1 being at least 3, while the proportional volume of the smaller ceramic particles (22) is small compared with that of the larger ceramic particles (24). In the lamp according to the invention, the electrodes (20a, 20b) have a comparatively high resistance to temperature variations in spite of the small proportional volume of metal particles.</p> |
