Objective lens

Claim 2

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE I E.F. 80 mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 infinity T1 4.0 + OR - 0.2 R2 infinity S1 2.0 + OR - 1.0 2.1.5891 61.24 R3 +32.80 T2 6.0 + OR - 0.1 R4 +75.78 S2 0.20 + OR - 0.02 3.1.6591 50.88 R5 +26.20 T3 6.995 + OR - 0.07 R6 +84.0 4.1.6200 36.34 R7 +84.0 T4 2.50 + OR - 0.07 R8 +16.58 S3 8.55 S4 12.386 5.1.6039 38.02 R9 -16.41 T5 2.00 + OR - 0.07 R10 -741.3 6.1.6591 50.88 R11 -741.3 T6 5.557 + OR - 0.070 R12 -22.85 S5 0.20 + OR - 0.025 7.1.5891 61.24 R13 -345.4 T7 5.50 + OR - 0.10 R14 -39.30 S6 18.057 8.1.5224 59.48 R15 infinity T8 3.81 + OR - 0.10 R16 infinity S7 36.50 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 80 millimeters.

Claim 3

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE II E.F. 912 mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2.1.5892 61.24 R3 +37.2 T2 6.79 + or - 0.10 R4 +85.72 S2 0.230 + or - 0.025 3.1.6591 50.88 R5 +29.6 T3 7.92 + or - 0.07 R6 +95.0 4.1.6200 36.34 R7 +95.0 T4 2.80 + or - 0.07 R8 +18.75 S3 9.67 S4 14.02 5.1.6039 38.02 R9 -18.61 T5 2.26 + or - 0.07 R10 -838.2 6.1.6591 50.88 R11 -838.2 T6 6.29 + or - 0.07 R12 -25.9 S5 0.230 + or - 0.025 7.1.5892 61.24 R13 -393.55 T7 6.20 + or - 0.10 R14 -44.5 S6 26.49 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.10 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 91.2 millimeters.

Claim 4

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE II E.F. 912 mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2.1.5892 61.24 R3 +37.2 T2 6.79 + or - 0.10 R4 +85.72 S2 0.230 + or - 0.025 3.1.6591 50.88 R5 +29.6 T3 7.92 + or - 0.07 R6 +95.0 4.1.6200 36.34 R7 +95.0 T4 2.80 + or - 0.07 R8 +18.75 S3 9.67 S4 14.02 5.1.6039 38.02 R9 -18.61 T5 2.26 + or - 0.07 R10 -838.2 6.1.6591 50.88 R11 -838.2 T6 6.29 + or - 0.07 R12 -25.9 S5 0.230 + or - 0.025 7.1.5892 61.24 R13 -393.55 T7 6.20 + or - 0.10 R14 -44.5 S6 26.49 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.10 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 91.2 millimeters.

Claim 5

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE III E.F. 115mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2.1.5891 61.24 R3 +45.66 T2 5.500 + or - 0.10 R4 +103.10 S2 0.20 + or - 0.025 3.1.6591 50.88 R5 +39.85 T3 11.325 + or - 0.07 R6 +140.0 4.1.6200 36.34 R7 +140.0 T4 3.600 + or - 0.07 R8 +24.87 S3 12.07 S4 18.757 5.1.6039 38.02 R9 -21.90 T5 2.800 + or - 0.07 R10 -256.2 6.1.6591 50.88 R11 -256.2 T6 7.553 + or - 0.07 R12 -30.90 S5 0.20 + or -0.025 7.1.5891 61.24 R13 -370.0 T7 6.500 + or - 0.10 R14 -53.60 S6 47.27 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.1 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 115 millimeters.

Claim 6

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE III E.F. 115mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2.1.5891 61.24 R3 +45.66 T2 5.500 + or - 0.10 R4 +103.10 S2 0.20 + or - 0.025 3.1.6591 50.88 R5 +39.85 T3 11.325 + or - 0.07 R6 +140.0 4.1.6200 36.34 R7 +140.0 T4 3.600 + or - 0.07 R8 +24.87 S3 12.07 S4 18.757 5.1.6039 38.02 R9 -21.90 T5 2.800 + or - 0.07 R10 -256.2 6.1.6591 50.88 R11 -256.2 T6 7.553 + or - 0.07 R12 -30.90 S5 0.20 + or -0.025 7.1.5891 61.24 R13 -370.0 T7 6.500 + or - 0.10 R14 -53.60 S6 47.27 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.1 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 115 millimeters.

Claim 7

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE IV E.F. 125 mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2. 1.5892 61.24 R3 +48.83 T2 5.90 + or - 0.10 R4 +110.60 S2 0.215 + or - 0.025 3.1.6591 50.88 R5 +42.75 T3 12.15 + or - 0.07 R6 +150.50 4.1.6200 36.34 R7 +150.50 T4 3.86 + or - 0.07 R8 +26.70 S3 12.95 S4 20.13 5.1.6039 38.02 R9 -23.50 T5 3.0 + or - 0.07 R10 -275.0 6.1.6591 50.88 R11 -275.0 T6 8.10 + or - 0.07 R12 -33.18 S5 0.215 + or - 0.025 7.1.5892 61.24 R13 -398.0 T7 6.97 + or - 0.10 R14 -57.54 S6 54.11 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.1 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 125 millimeters.

Claim 8

A microphotographic objective lens for providing reduced microfilm images and comprising eight elements numbered consecutively from object toward the image, front to rear, the first element being a filter, the second element being a first positive meniscus lens, the third element being a second positive meniscus lens, the fourth element being a first negative meniscus lens having a convex surface cemented to the concave surface of said second positive meniscus lens, the fifth element being a second negative meniscus lens, the sixth element being a third positive meniscus lens with a concave surface cemented to the convex surface of said second negative meniscus lens, the seventh element being a fourth positive meniscus lens, and the eighth element being a spaced transparent glass plate, the glass plate being an integral part of the optical system, said lens system having a relative aperture of F./6.0, and wherein the characteristics of said eight elements and their spatial relationship to each other are substantially in the proportions described in the following table: TABLE IV E.F. 125 mm. Element ND V Radii Thickness and mm. Spacing mm. 1.Schott GG-395 R1 Infinity T1 4.0 + or - 0.2 R2 Infinity S1 2.0 + or - 1.0 2. 1.5892 61.24 R3 +48.83 T2 5.90 + or - 0.10 R4 +110.60 S2 0.215 + or - 0.025 3.1.6591 50.88 R5 +42.75 T3 12.15 + or - 0.07 R6 +150.50 4.1.6200 36.34 R7 +150.50 T4 3.86 + or - 0.07 R8 +26.70 S3 12.95 S4 20.13 5.1.6039 38.02 R9 -23.50 T5 3.0 + or - 0.07 R10 -275.0 6.1.6591 50.88 R11 -275.0 T6 8.10 + or - 0.07 R12 -33.18 S5 0.215 + or - 0.025 7.1.5892 61.24 R13 -398.0 T7 6.97 + or - 0.10 R14 -57.54 S6 54.11 8.1.5224 59.48 R15 Infinity T8 3.81 + or - 0.1 R16 Infinity S7 36.5 to image plane wherein the respective lens elements are numbered in order from front to rear in the first column, the corresponding refractive indices N for the D line of the spectrum are given in the second column, the corresponding dispersive indices V are given in the third column, the radii of curvature R of the lens surfaces are given in the fourth column, the respective surfaces being numbered in order from front to rear and being respectively identified by a subscript numeral used with each R, mating cemented surfaces being counted as a single surface in numbering them, plus and minus values of R indicating surfaces which are respectively convex and concave toward the front of the lens, the axial thicknesses S of the air spaces between lens elements being given in the fifth column, the respective lens element thicknesses and air spaces being separately numbered from front to rear and being respectively identified by numeral subscripts used with each T and S, the quantities R, T, and S being expressed in millimeters for a lens having an equivalent focal length of substantially 125 millimeters.