Projection lens assembly

Claim 2

A projection lens assembly along an optical axis from front to rear comprising a double convex element, a first positive meniscus element convex to the front, a negative meniscus element convex to the front, a double concave element, a plano-concave element, a second positive meniscus element concave to the front, a third positive meniscus element concave to the front, and a double convex element.

Claim 3

A projection lens assembly made substantially according to the following chart of constructional data ______________________________________ Lens Radius Thickness Spacing Glass ______________________________________ 10 R.sub.1 = 7.3265 t.sub.1 = 0.355 S.sub.0 = 70,3844 Quartz R.sub.2 = -22.4810 S.sub.1 = 0.0100 12 R.sub.3 = 3.5895 t.sub.2 = 0.2964 Quartz R.sub.4 = 6.5000 S.sub.2 = 0.0142 14 R.sub.5 = 2.9760 t.sub.3 = 0.4958 Quartz R.sub.6 = 2.3935 S.sub.3 = 0.3919 16 R.sub.7 = -15.4387 t.sub.4 = 0.2000 LF5 R.sub.8 = 4.7949 S.sub.4 = 0.3939 18 R.sub.9 = -3.3488 t.sub.5 = 0.1500 Quartz R.sub.10 = Infinite(Plano) S.sub.5 = 0.0728 20 R.sub.11 = -5.5690 t.sub.6 = 0.4560 Quartz R.sub.12 = -4.3117 S.sub.6 = 0.0100 22 R.sub.13 -10.5652 t.sub.7 = 0.2322 Quartz R.sub.14 = -5.3070 S.sub.7 = 0.0100 24 R.sub.15 = 12.1492 t.sub.8 = 0.3522 Quartz R.sub.16 = -5.1078 S.sub.8 = 16.1812 ______________________________________ Note: F.O.V. = 41/2 × 6" at object plane 8 F/Number = f/9.0 Magnification = 4 EFL = 14.4 Aperture Stop Position 0.1036 from in front surface of element 18 Index of Refraction at 365 nanometers (i line): Quartz: 1.474553; LF5 1.619080 All dimensions in inches.

Claim 4

A projection lens assembly made substantially according to the following chart of constructional data ______________________________________ Lens Radius Thickness Spacing Glass ______________________________________ 10 R.sub.1 = 7.3265 t.sub.1 = 0.355 S.sub.0 = 70,3844 Quartz R.sub.2 = -22.4810 S.sub.1 = 0.0100 12 R.sub.3 = 3.5895 t.sub.2 = 0.2964 Quartz R.sub.4 = 6.5000 S.sub.2 = 0.0142 14 R.sub.5 = 2.9760 t.sub.3 = 0.4958 Quartz R.sub.6 = 2.3935 S.sub.3 = 0.3919 16 R.sub.7 = -15.4387 t.sub.4 = 0.2000 LF5 R.sub.8 = 4.7949 S.sub.4 = 0.3939 18 R.sub.9 = -3.3488 t.sub.5 = 0.1500 Quartz R.sub.10 = Infinite(Plano) S.sub.5 = 0.0728 20 R.sub.11 = -5.5690 t.sub.6 = 0.4560 Quartz R.sub.12 = -4.3117 S.sub.6 = 0.0100 22 R.sub.13 -10.5652 t.sub.7 = 0.2322 Quartz R.sub.14 = -5.3070 S.sub.7 = 0.0100 24 R.sub.15 = 12.1492 t.sub.8 = 0.3522 Quartz R.sub.16 = -5.1078 S.sub.8 = 16.1812 ______________________________________ Note: F.O.V. = 41/2 × 6" at object plane 8 F/Number = f/9.0 Magnification = 4 EFL = 14.4 Aperture Stop Position 0.1036 from in front surface of element 18 Index of Refraction at 365 nanometers (i line): Quartz: 1.474553; LF5 1.619080 All dimensions in inches.

Claim 5

The projection lens assembly as defined in claim 1 further including means for moving said plano-concave element along a predetermined plane perpendicular to the optical axis whereby image distortion produced by said projection lens assembly is minimized.

Claim 6

The projection lens assembly as defined in claim 3 wherein the plano surface of said plano-concave element bears against a flat surface of said second positive meniscus element outside the clear aperture thereof.

Claim 7

The projection lens assembly as defined in claim 3 wherein said moving means comprises micrometer adjustment means on one edge of said plano-concave element, spring load means on the opposite side of the plano-concave element on the edge thereof to oppose the opposing force of said micrometer adjustment means, wherein adjustment of said micrometer adjustment means causes the plano-concave element to move in said predetermined plane.

Claim 8

The apparatus as set forth in claim 5 wherein said micrometer adjustment means and opposing spring load means include a first micrometer and first opposing spring load for moving said plano-concave element along a first axis and a second micrometer and second opposing spring load means for moving said plano-concave element along a second axis, said first axis and second axis defining said predetermined plane and are displaced by ninety degrees.