Abstract: The invention relates to a projection objective with fixed focal length for digital projection, characterized by the following features: a first optical subassembly of several lenses seated in a first objective housing; a second optical subassembly of several lenses seated in a second objective housing; and a third objective housing that, in the region of one end, accepts the first objective housing, and in the region of the other end, accepts the second objective housing. Such an objective is designed to be structurally simple and makes possible a simple and precise assembly.

Abstract: The invention relates to a projection objective with fixed focal length for digital projection, characterized by the following features: a first optical subassembly of several lenses seated in a first objective housing; a second optical subassembly of several lenses seated in a second objective housing; and a third objective housing that, in the region of one end, accepts the first objective housing, and in the region of the other end, accepts the second objective housing. Such an objective is designed to be structurally simple and makes possible a simple and precise assembly.

Abstract: A lens assembly comprising nine lenses. Each lens includes u greater than or equal to about 12.8°, LEP equal to or from about 100 mm to about 400 mm, &agr; Rba greater than or equal to about 1°, and &agr; Rbi less than or equal to about −14°. The outward ray angle tilt and the inward ray angle tilt are positive if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in an opposite direction to projection. The outward ray angle tilt and the inward ray angle tilt are negative if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in the direction of projection.

Abstract: A lens assembly comprising seven lenses. Each lens includes u greater than or equal to about 12.8°, LEP equal to or from about 100 mm to about 400 mm, &sgr;Rba greater than or equal to about 1°, and &sgr;Rbi less than or equal to about −14°. The outward ray angle slopes and the inward ray angle slopes are positive if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in an opposite direction to projection. The outward ray angle slopes and the inward ray angle slopes are negative if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in an opposite direction to projection.

Abstract: A lens assembly comprising nine lenses. Each lens includes u greater than or equal to about 12.8°, LEP equal to or from about 100 mm to about 400 mm, &agr;Rba greater than or equal to about 1°, and &agr;Rbi less than or equal to about −14°. The outward ray angle tilt and the inward ray angle tilt are positive if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in an opposite direction to projection. The outward ray angle tilt and the inward ray angle tilt are negative if the outward ray and the inward ray intersect the optical axis at a location which, when seen from the object, is in the direction of projection.

Abstract: The invention relates to a projection objective which consists of at least seven lenses that are adjacent to air on both sides. The inventive projection objective meets the criteria of the following equations in its totality: u≧12.8°; 100 mm≦LEP≦400 mm; &sgr;RBa≧1°; &sgr;RBi≦−14°, whereby u is the aperture angle (2u-entire angle) on the illumination side; LEP is the distance from the entrance pupil (on the illumination side) to the object level (the position in the direction of projection from the reference point: object level corresponds to a positive value); &sgr;RBa is the angle inclination of the beam in relation to the optical axis in the object space between the object and the 1.