Patent ID: 6801373
Filing Date: 2004-10-05
Classification: G02B

Abstract:
A projection lens having nine lenses bordering to space on both sides, comprising following:u&gE;212.8Â°, 100 mm&lE;LEP&lE;400 mm, &agr; Rba&gE;1Â°, &agr; Rbi&lE;âˆ’14Â°, whereby u is the aperture angle (2u-entire angle) on the illumination side, LEP is the distance of the entrance pupil (on the illumination side) from the object plane (position in the direction of projection from the reference point of the object plane is a positive value), &agr; RBa is the beam's angular tilt with respect to the optical axis in the object space between the object and the first lens surface of the lens delimiting the bundle for the field edge (object's outer field point) towards the exterior (away from the optical axis, axis-remote) and &agr; RBi is the beam's angular tilt with respect to the optical axis in the object space between the object and the first lens surface of the lens, which delimits the bundle for the field edge (object's outer field point) towards the interior (towards the optical axis, axis-close), as well as that angles &agr; RBa and &agr; RBi am positive, if the respective beams intersect the optical axis at a point, which, when seen from the object, lies in the opposite direction of projection and negative, if they intersect the optical axis at a point, which, when seen from the object, lies in the direction of projection, with the following lens positions starting in sequence from the image (blow-up side) towards the object (reduction and illumination side): a first negative, meniscus-shaped lens (1), with the convex surface on the image side, a second negative, meniscus-shaped lens (2), with the convex surface on the image side, a third positive lens (3), with a convex surface on the object side, a fourth positive, meniscus-shaped lens (4), with a convex surface on the image side, a fifth negative lens (5), with a concave surface on the object side, a sixth biconvex lens (6), a seventh biconcave lens (7), an eighth positive lens (8), with a convex surface on the object side, a ninth positive lens (9), with a convex surface on the image side.