EP0506338A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Color-corrected telecentric scan lens
Assignee: 3M Co
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Filing: 1992-03-24
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Granted: —
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Expires: 2012-03-24
Abstract
Abstract A f/6.0, 71.0 mm focal length telecentric scan lens includes, in succession from a side of incident light: a first negative meniscus lens element (1), concave toward the incident light side; a second positive meniscus lens element (2), concave toward the incident light side; a first plano-convex lens element (3), convex away from the incident light side; a second plano-convex lens element (4), convex toward the incident light side; a first cemented doublet (5,6) including bi-concave and plano-convex lens elements, the cemented surface convex toward the incident light side; and a second cemented doublet (7,8) including plano-concave and plano-convex lens elements, the cemented surface convex toward the incident light side.
Inventors
- 👤 John J. C/O Minnesota Mining And Simbal
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:10
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/14; G02B13/146; G02B13/0005; G02B13/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
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 2
Dependent Claim
167 words
The scan lens of claim 1 wherein the lens is an f/6.0 lens with numerical characteristics substantially as follows: Lens Element & Spacing Surface Radius (mm) Thickness & Distance (mm) N d V d R₁ -27.309 1 3.76 1.80518 25.4 R₂ -118.949 d₂ 3.78 R₃ -44.651 2 8.98 1.77250 49.7 R₄ -35.608 d₃ 0.51 R₅ plano 3 8.13 1.74950 35.3 R₆ -55.189 d₄ 0.25 R₇ 74.844 4 13.53 1.74100 52.7 R₈ plano d₅ 8.65 R₉ -175.668 5 5.39 1.80518 25.4 R₁₀ 40.287 6 9.20 1.74100 52.7 R₁₁ 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 -R₁₁ 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 3
Dependent Claim
128 words
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 Element & Spacing Surface Radius (mm) Thickness & Distance (mm) N d V d d₆ 3.01 R₁₂ plano 7 4.60 1.76182 26.5 R₁₃ 91.740 8 4.70 1.74100 52.7 R₁₄ 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 R₁₂-R₁₄ refer to the surfaces of the lens elements in succession from the incident light side.
Claim 4
Dependent Claim
43 words
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 5
Dependent Claim
18 words
The scan lens of claim 1 wherein the first meniscus lens element is a negative meniscus lens element.
Claim 6
Dependent Claim
18 words
The scan lens of claim 1 wherein the second meniscus lens element is a positive meniscus lens element.
Claim 7
Dependent Claim
161 words
The scan lens of claim 1 wherein the lens is an f/6.0 lens with numerical characteristics substantially as follows: Lens Element & Spacing Surface Radius (mm) Thickness & Distance N d V d R₁₀₁ -27.087 101 4.10 1.80518 25.4 R₁₀₂ -116.937 d₁₀₂ 3.81 R₁₀₃ -44.651 102 9.04 1.77250 49.7 R₁₀₄ -35.608 d₁₀₃ 0.40 R₁₀₅ plano 103 8.00 1.74950 35.3 R₁₀₆ -55.189 d₁₀₄ 0.26 R₁₀₇ 74.844 104 10.32 1.74100 52.7 R₁₀₈ plano d₁₀₅ 8.74 R₁₀₉ -175.668 105 5.48 1.80518 25.4 R₁₁₀ 42.520 106 9.20 1.74100 52.7 R₁₁₁ plano wherein: numbers 101-106 refer to the lens elements in succession from the side of incident light; spacings d₁₀₂-d₁₀₅ refer to the distances between lens elements 101-105; surfaces R₁₀₁-R₁₁₁ 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 8
Dependent Claim
127 words
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 Element & Spacing Surface Radius (mm) Thickness & Distance (mm) N d V d d₁₀₆ 0.25 R₁₁₂ plano 107 4.60 1.76182 26.5 R₁₁₃ 93.003 108 4.70 1.74100 52.7 R₁₁₄ plano wherein: numbers 107 and 108 refer to the lens elements in succession from the side of incident light; spacing d₁₀₆ is the distance between lens elements 106 and 107; and surfaces R₁₁₂-R₁₁₄ refer to the surfaces of the lens elements in succession from the incident light side.
References Cited (Backward Citations)
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