Copying lens

Claim 2

In a lens system of five groups of five lens elements in which a front group of two lens elements and a back group of two lens elements are symmetrically arranged with a biconvex lens installed therebetween in the center of the lens system, a copying lens characterised in that each of the lens elements is constituted in sequence from the object by the first lens of a positive meniscus lens with its convex surface directed toward the object, the second lens of a biconcave lens, the third lens of a biconvex lens, the fourth lens of a biconcave lens, and the fifth lens of a positive meniscus lens with its convex surface being directed toward the image and in which the condition 0.2 f<f.sub.3 <0.7 f (1) where, f: overall focal length, f 3 : focal length of the third lens, and the condition 0.01 f<d.sub.4 and d.sub.6 <0.09 f (2) where, d 1 , d 2 , d 3 , . . . d 9 : thickness of the lenses and air gaps counted in sequence from the object, are fulfilled.

Claim 3

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° Y = 160 ______________________________________ r.sub.1 = 42.701 d.sub.1 = 7.08 n.sub.1 = 1.69680 ν.sub.1 = 55.5 r.sub.2 = 102.239 d.sub.2 = 2.50 r.sub.3 = -421.315 d.sub.3 = 2.00 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 43.423 d.sub.4 = 5.57 r.sub.5 = 93.836 d.sub.5 = 5.11 n.sub.3 = 1.74400 ν.sub.3 = 44.7 r.sub.6 = -93.836 d.sub.6 = 5.57 r.sub.7 = -43.423 d.sub.7 = 2.00 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 421.315 d.sub.8 = 2.50 r.sub.9 = -102.239 d.sub.9 = 7.08 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = -42.701 ______________________________________ f.sub.3 = 63.80 total length of the lens: 39.41 value of the condition (1): 0.425 f value of the condition (2): 0.037 f value of the condition (3): 5.13 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : thickness of the lenses and air gaps counted in sequence from the object, n 1 , n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object. ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 4

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 45.468 d.sub.1 = 6.75 n.sub.1 = 1.69680 ν.sub.1 = 55.5 r.sub.2 = 139.884 d.sub.2 = 2.60 r.sub.3 = -297.525 d.sub.3 = 2.00 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 46.294 d.sub.4 = 10.00 r.sub.5 = 108.311 d.sub.5 = 5.93 n.sub.3 = 1.74400 ν.sub.3 = 44.7 r.sub.6 = -108.311 d.sub.6 = 10.00 r.sub.7 = -46.294 d.sub.7 = 2.00 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 297.525 d.sub.8 = 2.60 r.sub.9 = -139.884 d.sub.9 = 6.75 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = -45.468 ______________________________________ f.sub.3 = 73.65 total length of the lens: 48.63 value of the condition (1): 0.491 f value of the condition (2): 0.066 f value of the condition (3): 5.13 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 , ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 5

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 46.556 d.sub.1 = 9.23 n.sub.1 = 1.69680 ν.sub.1 = 55.5 r.sub.2 = 114.585 d.sub.2 = 2.40 r.sub.3 = -296.458 d.sub.3 = 2.00 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 46.524 d.sub.4 = 4.50 r.sub.5 = 89.963 d.sub.5 = 3.60 n.sub.3 = 1.74400 ν.sub.3 = 44.7 r.sub.6 = -89.963 d.sub.6 = 4.50 r.sub.7 = -46.524 d.sub.7 = 2.00 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 296.458 d.sub.8 = 2.40 r.sub.9 = -114.583 d.sub.9 = 9.23 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = -46.556 ______________________________________ f.sub.3 = 60.98 total length of the lens: 39.86 value of the condition (1): 0.406 f value of the condition (2): 0.030 f value of the condition (3): 5.13 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 6

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 49.814 d.sub.1 = 9.99 n.sub.1 = 1.69680 ν.sub.1 = 55.5 r.sub.2 = 90.792 d.sub.2 = 2.99 r.sub.3 = -352.325 d.sub.3 = 4.00 n.sub.2 = 1.59270 ν.sub.2 = 35.3 r.sub.4 = 48.764 d.sub.4 = 2.86 r.sub.5 = 80.000 d.sub.5 = 10.00 n.sub.3 = 1.80610 ν.sub.3 = 40.9 r.sub.6 = -80.000 d.sub.6 = 2.86 r.sub.7 = -48.764 d.sub.7 = 4.00 n.sub.4 = 1.59270 ν.sub.4 = 35.3 r.sub.8 = 352.325 d.sub.8 = 2.99 r.sub.9 = -90.792 d.sub.9 = 9.99 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = -49.814 ______________________________________ f.sub.3 = 51.05 total length of the lens: 49.68 value of the condition (1): 0.340 f value of the condition (2): 0.019 f value of the condition (3): 5.20 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 7

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 48.845 d.sub.1 = 9.98 n.sub.1 = 1.71300 ν.sub.1 = 53.9 r.sub.2 = 132.597 d.sub.2 = 2.31 r.sub.3 = -342.627 d.sub.3 = 2.95 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 48.015 d.sub.4 = 6.60 r.sub.5 = 102.299 d.sub.5 = 4.08 n.sub.3 = 1.74320 ν.sub.3 = 49.4 r.sub.6 = -102.299 d.sub.6 = 6.60 r.sub.7 = -48.015 d.sub.7 = 2.95 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 342.627 d.sub.8 = 2.31 r.sub.9 = -132.597 d.sub.9 = 9.98 n.sub.5 = 1.71300 ν.sub.5 = 53.9 r.sub.10 = -48.845 ______________________________________ f.sub.3 = 69.41 total length of the lens: 47.76 value of the condition (1): 0.463 f value of the condition (2): 0.044 f value of the condition (3): 5.17 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a referactive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 8

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 43.999 d.sub.1 = 8.21 n.sub.1 = 1.69680 ν.sub.1 = 55.5 r.sub.2 = 92.383 d.sub.2 = 2.50 r.sub.3 = -324.664 d.sub.3 = 2.00 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 44.322 d.sub.4 = 3.49 r.sub.5 = 80.000 d.sub.5 = 3.72 n.sub.3 = 1.74400 ν.sub.3 = 44.7 r.sub.6 = -80.000 d.sub.6 = 3.49 r.sub.7 = -44.322 d.sub.7 = 2.00 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 324.664 d.sub.8 = 2.50 r.sub.9 = -92.383 d.sub.9 = 8.21 n.sub.5 = 1.69680 ν.sub.5 = 55.5 r.sub.10 = -43.999 ______________________________________ f.sub. 3 = 54.30 total length of the lens: 36.12 value of the condition (1): 0.362 f value of the condition (2): 0.023 f value of the condition (3): 5.14 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 9

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° ______________________________________ r.sub.1 = 42.980 d.sub.1 = 6.92 n.sub.1 = 1.69350 ν.sub.1 = 53.2 r.sub.2 = 137.183 d.sub.2 = 2.60 r.sub.3 = -1047.028 d.sub.3 = 2.17 n.sub.2 = 1.59551 ν.sub.2 = 39.2 r.sub.4 = 42.060 d.sub.4 = 8.91 r.sub.5 = 120.000 d.sub.5 = 5.70 n.sub.3 = 1.71700 ν.sub.3 = 47.9 r.sub.6 = -120.000 d.sub.6 = 8.91 r.sub.7 = -42.060 d.sub.7 = 2.17 n.sub.4 = 1.59551 ν.sub.4 = 39.2 r.sub.8 = 1047.028 d.sub.8 = 2.60 r.sub.9 = -137.183 d.sub.9 = 6.92 n.sub.5 = 1.69350 ν.sub.5 = 53.2 r.sub.10 = -42.980 ______________________________________ f.sub.3 = 84.52 total length of the lens: 46.90 value of the condition (1): 0.563 f value of the condition (2): 0.059 f value of the condition (3): 5.10 3.19 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.

Claim 10

Copying lens as set forth in claim 1 constructed according to the constructional data given herebelow, ______________________________________ f = 150 F 4.5 2ω = 56° Y = 160 ______________________________________ r.sub.1 = 41.291 d.sub.1 = 6.36 n.sub.1 = 1.65160 ν.sub.1 = 58.6 r.sub.2 = 116.153 d.sub.2 = 2.40 r.sub.3 = -290.421 d.sub.3 = 1.90 n.sub.2 = 1.58144 ν.sub.2 = 40.7 r.sub.4 = 42.946 d.sub.4 = 7.00 r.sub.5 = 96.499 d.sub.5 = 4.00 n.sub.3 = 1.74400 ν.sub.3 = 44.7 r.sub.6 = -96.499 d.sub.6 = 7.00 r.sub.7 = -42.946 d.sub.7 = 1.90 n.sub.4 = 1.58144 ν.sub.4 = 40.7 r.sub.8 = 290.421 d.sub.8 = 2.40 r.sub.9 = -116.153 d.sub.9 = 6.36 n.sub.5 = 1.65160 ν.sub.5 = 58.6 r.sub.10 = -41.291 ______________________________________ f.sub.3 = 65.43 total length of the lens: 39.32 value of the condition (1): 0.436 f value of the condition (2): 0.047 f value of the condition (3): 5.04 3.16 where, f: a composite focal length of the objective, F: F number, 2ω: field angle, Y: image height, r 1 ,r 2 , . . . r 10 : a radius of curvature of lens surface counted in sequence from the object, d 1 ,d 2 , . . . d 9 : a thickness of the lenses and air gaps counted in sequence from the object, n 1 ,n 2 , . . . n 5 : a refractive index with respect to a line d of the lens counted in sequence from the object, ν 1 ,ν 2 , . . . ν 5 : Abbe number of the lens counted in sequence from the object.