| 摘要 |
The electric incandescent lamp has a quartz glass lamp vessel (1) or envelope (4') around the lamp vessel, which has a red coloured dope in the area at the side of the incandescent body (3). The quartz glass with red dope contains samarium<II> oxide, aluminium oxide and silicon dioxide, the analysis of the glass in its oxidised form being Sm2O3 1 to 3 % by weight, Al2O3 up to 3 % by weight, rest SiO2, the molar ratio Al/Sm being at least 2. |
