Lighting device, has projection display unit which modulates light from lighting device according to given image information via light valve

摘要

A lighting device comprises a group of light sources with light source sections each formed from a luminous element or filament and a parabolic reflector. An integrator section is formed from at least two integrator plates in order to homogenize a light quanta emitted from the group of light sources in a section orthogonal to the optical axis, in which the integrated section is arranged in the direction of the optical axis. A parallel light flux-approximation-optical system is provided with a number of lens groups which largely correspond individually to the number of light source sections in the light source group. At least two lens groups are arranged downstream of the focal point in order to emit the light fluxes from the light-source group as a mainly parallel light flux to the integrator section. The first lens group forms a pair mainly parallel to one another and satisfies a Boolean expression Saxis Faxis, where Saxis is the distance between the optical axis of the complete lighting device and the optical axis of the light source section and Faxis is the spacing between the optical axis of the complete lighting device and the optical axis of the first lens group. An Independent claim is given for a projection display device.