Incandescent lamp with reflection coating

H - Electricity – 01 – K

Patent

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Details

H01K 1/28 (2006.01)

Patent

CA 2249720

An electric filament incandescent in lamp, in particular a halogen incandescent lamp (9) with a rotationally symmetrical lamp bulb (10) and 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 large semiaxis, and, consequently focal axis of which is oriented vertically to the longitudinal axis, i.e. vertically to the rotational axis of the lamp bulb (10). The length of the large semiaxis (a) lies preferably in the range R < a < R + 5.w r, wherein R and w r respectively stand for the greatest radius of the lamp bulb (10) and the radius of the cylindrical luminous element (15). The lamp (9) is characterized by uniform back reflection of the I.R. radiation onto the cylindrical luminous element (15) arranged centrically on-axis inside the lamp bulb (10), and thus by a regular temperature distribution, as well as by increased lamp efficiency.

Une lampe à incandescence, en particulier une lampe à halogène (9) comprenant une ampoule (10) symétrique en rotation et un revêtement (14) réfléchissant le rayonnement IR, présente un profil partiellement ellipsoïdal. Le profil partiel ellipsoïdal de l'ampoule est obtenu par une section en ellipse, dont le grand demi-axe et, par conséquent, son axe focal, est perpendiculaire à l'axe longitudinal, c'est-à-dire est orienté perpendiculairement à l'axe de rotation de l'ampoule (10). De préférence, la longueur du grand demi-axe a se situe dans la plage R < a < R + 5.wr, où R et wr désignent, respectivement, le plus grand rayon de l'ampoule (10) et, le rayon de l'élément lumineux cylindrique (15). En plus d'un accroissement du rendement, la lampe (9) est caractérisée par une rétroréflexion uniforme du rayonnement IR sur l'élément lumineux cylindrique (15) disposé au centre, axialement, à l'intérieur de l'ampoule (10) et, de ce fait, par une répartition uniforme de la température.

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