| 摘要 |
A lamp unit with a light control function for the light emitted from this lamp unit, for which a high pressure mercury lamp is used which is filled with at least 0.15 mg/mm<3> mercury and which has a hermetically enclosing arrangement, an essentially hermetically enclosing arrangement or an arrangement in which there is a flow path for actively flowing cooling air within. The lamp unit for a projector has a high pressure mercury lamp of the short arc type with a wall load of at least 1 W/mm<2> which is filled with at least 0.15 mg/mm<3> mercury, a concave reflector which surrounds this mercury lamp, a front cover which covers the front opening of this concave reflector, a cooling arrangement which can be controlled with respect to its cooling intensity for cooling of the concave reflector and/or the mercury lamp and a control device by which the power of the mercury lamp can be changed, the cooling and the control device being made such that, by controlling the two, a value in the range of 1 < (W x G/V) can be set, where V (in cm<3>) is the inside volume of the concave reflector, W (in W) is the rated power of the mercury lamp and G (in W/mm<2>) is the wall load. Furthermore, a process for light controlling such a lamp unit is given. <IMAGE> |
