| 摘要 |
An electric incandescent lamp, in particular a halogen incandescent lam p (9) with a rotationally symmetrical lamp bulb (10) and an I.R. radiation reflecting coating (14), has an ellipsoidal partial contour. The ellipsoidal partial contour of the lamp bulb is produced by an elliptical section, the semiaxis of which is oriented vertically to the longitudinal axis, i.e. vertically to the rotational axis of the lamp bulb (10), and is longer than the greatest radiu s R of the lamp bulb. The length of the smallest semiaxis b lies preferably in the range R < b < R + 5 . w r, where R and w r respectively stand for the greate st radius of the lamp bulb (10) and the radius of the rotationally symmetrical luminou s element (15). The lamp (9) is characterized by uniform back reflection of the I.R. radiation onto the luminous element (15) arranged centrically on-ax is inside the lamp bulb (10), and thus by a regular temperature distribution, a s well as by increased lamp efficiency. |
