Lens having high resolving power

Claim 2

A lens system having a high resolving power and object and image ends, comprising, in order from the object end, a first double convex lens, a second negative meniscus lens having its concave surface facing the object and a third positive lens having its convex surface facing the object end, the lens system satisfying the relation: - 0.18/F < 1/Rb < 0.18/F - 0.6/f < (na-1/Ra) < - 0.4/F wherein Ra is the radius of curvature of the surface of said second negative meniscus lens on the image end of the lens system, Rb the radius of curvature of the surface of said third positive lens on the image end, F the focal distance of the total lens system and Na the refractive index of said second meniscus lens.

Claim 3

A lens system having a high resolving power and object and image ends, comprising: a first positive lens group including two positive meniscus lenses having their convex surfaces facing to the object end, a second negative meniscus lens having its concave surface facing to the object end and a third positive lens having its convex surface facing to the object end, all in order from the object end, the lens system satisfying the following relation: - 0.18/F < 1/Rb < 0.18/F - 0.25/f < (na-1/Ra) <- 0.2/F wherein Ra represents the radius of curvature of the surface of said second negative meniscus lens on the image end of the lens system, Rb the radius of curvature of the surface of said third positive lens on the image end, F the focal distance of the total lens system and Na the refractive index of said second meniscus lens.

Claim 4

A lens system having a high resolving power and object and image ends, comprising: a first positive lens group including two positive meniscus lenses having their convex surfaces facing to the object end, a second negative meniscus lens having its concave surface facing to the object end and a third positive lens having its convex surface facing to the object end, all in order from the object end, the lens system satisfying the following relation: - 0.18/F < 1/Rb < 0.18/F - 0.25/f < (na-1/Ra) <- 0.2/F wherein Ra represents the radius of curvature of the surface of said second negative meniscus lens on the image end of the lens system, Rb the radius of curvature of the surface of said third positive lens on the image end, F the focal distance of the total lens system and Na the refractive index of said second meniscus lens.

Claim 5

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Ra is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane side is concave relative to the image plane, and the following data are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 4.0986 ______________________________________ R1 = 19.33297 D1 = 3.54922 N1 = 1.80024 R2 = -106.00698 l1 = 1.13716 R3 = -12.05644 D2 = 1.12640 N2 = 1.51385 R4 = -18.59293 l2 = 5.08022 R5 = 8.01846 D3 = 4.67280 N3 = 1.80024 R6 = 124.02474 ##STR13## ##STR14## ##STR15## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 6

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Ra is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane side is concave relative to the image plane, and the following data are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 4.0986 ______________________________________ R1 = 19.33297 D1 = 3.54922 N1 = 1.80024 R2 = -106.00698 l1 = 1.13716 R3 = -12.05644 D2 = 1.12640 N2 = 1.51385 R4 = -18.59293 l2 = 5.08022 R5 = 8.01846 D3 = 4.67280 N3 = 1.80024 R6 = 124.02474 ##STR13## ##STR14## ##STR15## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 7

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the objct end, wherein 0.8 < R/L, and - 0.18/F - 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said thrd positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane end is concave relative to the image plane and the following data are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 2.75038 ______________________________________ R1 = 18.28320 D1 = 7.5 N1 = 1.79609 R2 = -84.05195 l1 = 1.74615 R3 = -10.46215 D2 = 2.5 N2 = 1.51385 R4 = -14.70660 l2 = 3.4916 R5 = 7.06950 D3 = 5. N3 = 1.79609 R6 = 62.92920 ##STR16## ##STR17## ##STR18## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 8

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the objct end, wherein 0.8 < R/L, and - 0.18/F - 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said thrd positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane end is concave relative to the image plane and the following data are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 2.75038 ______________________________________ R1 = 18.28320 D1 = 7.5 N1 = 1.79609 R2 = -84.05195 l1 = 1.74615 R3 = -10.46215 D2 = 2.5 N2 = 1.51385 R4 = -14.70660 l2 = 3.4916 R5 = 7.06950 D3 = 5. N3 = 1.79609 R6 = 62.92920 ##STR16## ##STR17## ##STR18## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 9

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane end is concave relative to the image plane, and the following data are satisfied: ______________________________________ F = 10, NA = 0.5 bf = 2.92267 ______________________________________ R1 = 17.44775 D1 = 7.5 N1 = 1.79609 R2 = -47.46225 l1 = 2.15675 R3 = -9.40820 D2 = 2.5 N2 = 1.51385 R4 = -14.64175 l2 = 1.90520 R5 = 8.6255 D3 = 5. N3 = 1.79609 R6 = -63.77835 ##STR19## ##STR20## ##STR21## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 10

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens consisting of a one-piece double convex lens, and the inequality, - 0.6/F < (Na-1/Ra) <- 0.4/F is satisfied when the radius of curvature of said second negative lens at an image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane end is concave relative to the image plane, and the following data are satisfied: ______________________________________ F = 10, NA = 0.5 bf = 2.92267 ______________________________________ R1 = 17.44775 D1 = 7.5 N1 = 1.79609 R2 = -47.46225 l1 = 2.15675 R3 = -9.40820 D2 = 2.5 N2 = 1.51385 R4 = -14.64175 l2 = 1.90520 R5 = 8.6255 D3 = 5. N3 = 1.79609 R6 = -63.77835 ##STR19## ##STR20## ##STR21## ______________________________________ wherein R1, R2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, NA the number of lens apertures and F the focal length of the whole system.

Claim 11

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens group having two positive meniscus lenses having their convex surfaces facing the object end, and an inequality, - 0.25/F < (Na-1/Ra) < - 0.2/F, is satisfied when the radius of the second negative lens at the image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane side is concave relative to the image plane, and the following date are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 3.11167 ______________________________________ R'1 = 21.422 D1 = 1.49 N1 = 1.80024 R'2 = 202.96 l1 = 0.1 R'3 = 15.39 D2 = 1.18 N2 = 1.80024 R'4 = 67.615 l2 = 0.57 R'5 = -27.283 D3 = 0.73 N3 = 1.61974 R'6 = -95.897 l3 = 7.95 R'7 = 6.718 D4 = 1.2 N4 = 1.80024 R'8 = 57.145 ##STR22## ##STR23## ##STR24## ______________________________________ wherein R'1, R'2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, Na the number of lens apertures and F the focal length of the whole system.

Claim 12

A high resolving power lens system with an object end and an image end, comprising a first positive lens group including a positive lens, a second negative lens which is a negative meniscus lens having its concave surface facing the object end and a third positive lens having its convex surface facing the object end all positioned in order from the object end, said system having an air space L on optical axis between said second negative lens and said third positive lens and a radius of curvature R of the surface of the third positive lens from the object end, wherein 0.8 < R/L, and - 0.18/F < 1/Rb < 0.18/F, and wherein Rd is the radius of curvature of the surface of said third positive lens at the image end and F the focal distance of the total system, said first positive lens group having two positive meniscus lenses having their convex surfaces facing the object end, and an inequality, - 0.25/F < (Na-1/Ra) < - 0.2/F, is satisfied when the radius of the second negative lens at the image plane side is represented by Ra and the refractive index of the second negative lens is represented by Na, in which the surface of said third positive lens at the image plane side is concave relative to the image plane, and the following date are satisfied: ______________________________________ F = 10, NA = 0.5, bf = 3.11167 ______________________________________ R'1 = 21.422 D1 = 1.49 N1 = 1.80024 R'2 = 202.96 l1 = 0.1 R'3 = 15.39 D2 = 1.18 N2 = 1.80024 R'4 = 67.615 l2 = 0.57 R'5 = -27.283 D3 = 0.73 N3 = 1.61974 R'6 = -95.897 l3 = 7.95 R'7 = 6.718 D4 = 1.2 N4 = 1.80024 R'8 = 57.145 ##STR22## ##STR23## ##STR24## ______________________________________ wherein R'1, R'2, . . . are the successive radii of curvature from the object end, D1, D2, the successive axial lens thickness from the object end, l 1 , l 2 , . . . the successive lens spacings from the object end, N1, N2, . . . the successive refractive indexes of the lenses from the object end, bf the back focus of the lens system, Na the number of lens apertures and F the focal length of the whole system.