Projection lens
AssigneesDr.-Ing. Wolfgang Reinecke Ingenieurburo fur Optik-Entwicklung, Optische Systeme Gottingen ISCO-Optic GmbH
InventorsWolfgang Reinecke, Horst Linge
Life of this patent
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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, αRba greater than or equal to about 1°, and αRbi 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.
Claims5
A projection lens having nine lenses bordering to space on both sides, characterized by the following:
- u≧12.8°,
- 100 mm≦LEP≦400 mm,
- αRba≧1°,
- αRbi≦−14°,
- whereby u is the aperture angle (2 u-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),
- αRBa 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
- αRBi 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 αRBa and αRBi are 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.
Dependencies are inferred from the claim text.