Color-corrected telecentric scan lens

Claim 2

A multiple element telecentric scan lens comprising, in succession from a side of incident light: a first meniscus lens element, concave toward the incident light side; a second meniscus lens element, concave toward the incident light side; a first plano-convex lens element, convex away from the incident light side; a second plano-convex lens element, convex toward the incident light side; and a first cemented doublet including bi-concave and plano-convex lens elements, the cemented surface convex toward the incident light side.

Claim 3

The scan lens of claim 1 wherein the lens is an f/6.0 lens with numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ R.sub.1 -27.309 1 3.76 1.80518 25.4 R.sub.2 -118.949 .sup. d.sub.2 3.78 R.sub.3 -44.651 2 8.98 1.77250 49.7 R.sub.4 -35.608 .sup. d.sub.3 0.51 R.sub.5 plano 3 8.13 1.74950 35.3 R.sub.6 -55.189 .sup. d.sub.4 0.25 R.sub.7 74.844 4 13.53 1.74100 52.7 R.sub.8 plano .sup. d.sub.5 8.65 R.sub.9 -175.668 5 5.39 1.80518 25.4 .sup. R.sub.10 40.287 6 9.20 1.74100 52.7 .sup. R.sub.11 plano ______________________________________ wherein: numbers 1-6 refer to the lens elements in succession from the side of incident light; spacings d 2 -d 5 refer to the distances between lens elements 1-5; surfaces R 1 -R 11 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.

Claim 4

The scan lens of claim 2 and further comprising a second cemented doublet opposite the first cemented doublet from the incident light side, the second cemented doublet including plano-concave and plano-convex lens elements with the cemented surface convex toward the incident light side, with numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ .sup. d.sub.6 3.01 R.sub.12 plano 7 4.60 1.76182 26.5 R.sub.13 91.740 8 4.70 1.74100 52.7 R.sub.14 plano ______________________________________ wherein: numbers 7 and 8 refer to the lens elements in succession from the side of incident light; spacing d 6 is the distance between lens elements 6 and 7; and surfaces R 12 -R 14 refer to the surfaces of the lens elements in succession from the incident light side.

Claim 5

The scan lens of claim 1 and further comprising a second cemented doublet opposite the first cemented doublet from the incident light side, the second cemented doublet including plano-concave and plano-convex lens elements with the cemented surface convex toward the incident light side.

Claim 6

The scan lens of claim 1 wherein the first meniscus lens element is a negative meniscus lens element.

Claim 7

The scan lens of claim 1 wherein the second meniscus lens element is a positive meniscus lens element.

Claim 8

The scan lens of claim 1 wherein the lens is an f/6.0 lens with numerical characteristics substantially as follows: ______________________________________ Lens Element & Radius Thickness Spacing Surface (mm) & Distance N.sub.d V.sub.d ______________________________________ R.sub.101 -27.087 101 4.10 1.80518 25.4 R.sub.102 -116.937 d.sub.102 3.81 R.sub.103 -44.651 102 9.04 1.77250 49.7 R.sub.104 -35.608 d.sub.103 0.40 R.sub.105 plano 103 8.00 1.74950 35.3 R.sub.106 -55.189 d.sub.104 0.26 R.sub.107 74.844 104 10.32 1.74100 52.7 R.sub.108 plano d.sub.105 8.74 R.sub.109 -175.668 105 5.48 1.80518 25.4 R.sub.110 42.520 106 9.20 1.74100 52.7 R.sub.111 plano ______________________________________ wherein: numbers 101-106 refer to the lens elements in succession from the side of incident light; spacings d 102 -d 105 refer to the distances between lens elements 101-105; surfaces R 101 -R 111 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the Sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.

Claim 9

The scan lens of claim 7 and further comprising a second cemented doublet opposite the first cemented doublet from the incident light side, the second cemented doublet including plano-concave and plano-convex lens elements with the cemented surface convex toward the incident light side, with numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ d.sub.106 0.25 R.sub.112 plano 107 4.60 1.76182 26.5 R.sub.113 93.003 108 4.70 1.74100 52.7 R.sub.114 plano ______________________________________ wherein: numbers 107 and 108 refer to the lens elements in succession from the side of incident light; spacing d 106 is the distance between lens elements 106 and 107; and surfaces R 112 -R 114 refer to the surfaces of the lens elements in succession from the incident light side.

Claim 10

An eight lens element 71.009 mm focal length f/6.0 telecentric scan lens having numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ R.sub.1 -27.309 1 3.76 1.80518 25.4 R.sub.2 -118.949 .sup. d.sub.2 3.78 R.sub.3 -44.651 2 8.98 1.77250 49.7 R.sub.4 -35.608 .sup. d.sub.3 0.51 R.sub.5 plano 3 8.13 1.74950 35.3 R.sub.6 -55.189 .sup. d.sub.4 0.25 R.sub.7 74.844 4 13.53 1.74100 52.7 R.sub.8 plano .sup. d.sub.5 8.65 R.sub.9 -175.668 5 5.39 1.80518 25.4 .sup. R.sub.10 40.287 6 9.20 1.74100 52.7 .sup. R.sub.11 plano .sup. d.sub.6 3.01 .sup. R.sub.12 plano 7 4.60 1.76182 26.5 .sup. R.sub.13 91.740 8 4.70 1.74100 52.7 .sup. R.sub.14 plano ______________________________________ wherein: numbers 1-8 refer to the lens elements in succession from an incident light side; spacings d 2 -d 6 refer to the distances between lens elements 1-5 and 6 and 7, respectively; surfaces R 1 -R 14 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the Sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.

Claim 11

An eight lens element 71.009 mm focal length f/6.0 telecentric scan lens having numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ R.sub.1 -27.309 1 3.76 1.80518 25.4 R.sub.2 -118.949 .sup. d.sub.2 3.78 R.sub.3 -44.651 2 8.98 1.77250 49.7 R.sub.4 -35.608 .sup. d.sub.3 0.51 R.sub.5 plano 3 8.13 1.74950 35.3 R.sub.6 -55.189 .sup. d.sub.4 0.25 R.sub.7 74.844 4 13.53 1.74100 52.7 R.sub.8 plano .sup. d.sub.5 8.65 R.sub.9 -175.668 5 5.39 1.80518 25.4 .sup. R.sub.10 40.287 6 9.20 1.74100 52.7 .sup. R.sub.11 plano .sup. d.sub.6 3.01 .sup. R.sub.12 plano 7 4.60 1.76182 26.5 .sup. R.sub.13 91.740 8 4.70 1.74100 52.7 .sup. R.sub.14 plano ______________________________________ wherein: numbers 1-8 refer to the lens elements in succession from an incident light side; spacings d 2 -d 6 refer to the distances between lens elements 1-5 and 6 and 7, respectively; surfaces R 1 -R 14 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the Sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.

Claim 12

An eight element 71.004 mm f/6.0 telecentric scan lens having numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ R.sub.101 -27.087 101 4.10 1.80518 25.4 R.sub.102 -116.937 d.sub.102 3.81 R.sub.103 -44.651 102 9.04 1.77250 49.7 R.sub.104 -35.608 d.sub.103 0.40 R.sub.105 plano 103 8.00 1.74950 35.3 R.sub.106 -55.189 d.sub.104 0.26 R.sub.107 74.844 104 10.32 1.74100 52.7 R.sub.108 plano d.sub.105 8.74 R.sub.109 -175.668 105 5.48 1.80518 25.4 R.sub.110 42.520 106 9.20 1.74100 52.7 R.sub.111 plano d.sub.106 0.25 R.sub.112 plano 107 4.60 1.76182 26.5 R.sub.113 93.003 108 4.70 1.74100 52.7 R.sub.114 plano ______________________________________ wherein: numbers 101-108 refer to the lens elements in succession from an incident light side; spacings d 102 -d 106 refer to the distances between lens elements 101-105 and 106 and 107, respectively; surfaces R 101 -R 114 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the Sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.

Claim 13

An eight element 71.004 mm f/6.0 telecentric scan lens having numerical characteristics substantially as follows: ______________________________________ Lens Thickness Element & Radius & Distance Spacing Surface (mm) (mm) N.sub.d V.sub.d ______________________________________ R.sub.101 -27.087 101 4.10 1.80518 25.4 R.sub.102 -116.937 d.sub.102 3.81 R.sub.103 -44.651 102 9.04 1.77250 49.7 R.sub.104 -35.608 d.sub.103 0.40 R.sub.105 plano 103 8.00 1.74950 35.3 R.sub.106 -55.189 d.sub.104 0.26 R.sub.107 74.844 104 10.32 1.74100 52.7 R.sub.108 plano d.sub.105 8.74 R.sub.109 -175.668 105 5.48 1.80518 25.4 R.sub.110 42.520 106 9.20 1.74100 52.7 R.sub.111 plano d.sub.106 0.25 R.sub.112 plano 107 4.60 1.76182 26.5 R.sub.113 93.003 108 4.70 1.74100 52.7 R.sub.114 plano ______________________________________ wherein: numbers 101-108 refer to the lens elements in succession from an incident light side; spacings d 102 -d 106 refer to the distances between lens elements 101-105 and 106 and 107, respectively; surfaces R 101 -R 114 refer to the surfaces of the lens elements in succession from the incident light side; N d refers to the refractive indices of the lens elements at the Sodium d line; and V d refers to the Abbe numbers of the materials of the lens elements.