| 摘要 |
PURPOSE: A short-arc lamp having a xenon fill is provided to permit optimum focusing of the light onto small cross sections of between 10 and 25 mm, corresponding to the diagonals of the integrators that are used in digital projection technologies. CONSTITUTION: A cathode(6) is composed of a conical end section(6a), which faces an anode(8), and an end section(6b) which faces an electrode rod(5) and has a circular-cylindrical subsection as well as a frustoconical subsection, a section(6c) of smaller diameter, which is likewise circular-cylindrical and is referred to as a heat damming groove being located between these two sections(6a,6b). The tip of the conical end section(6a), which faces the anode(8) and has a vertex angle of 40 degree, is designed as a hemisphere with a radius of 0.6 mm. The anode(8) consists of a circular-cylindrical middle section(8a) with a diameter(D) of 22 mm and two frustoconical end sections(8b,8c), which respectively face the cathode(6) and the electrode rod(7). The frustoconical end section(8c) that faces the cathode(6) has a plateau(AP) with a diameter of 6 mm. All the sections of the two electrodes(6,8) are made of tungsten. |
