US3744880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision copying lens
Assignee: Individual
•
Filing: 1972-02-10
•
Granted: 1973-07-10
•
Expires: 1992-02-10
Abstract
Abstract The precision copying lens comprises a first to a seventh lens component beginning at the object side, the first and the second lens component forming the first part of the lens and the third and the fourth lens component forming the second part spaced a distance from the first part, while the fifth to the seventh lens component form the third part spaced a distance from the second part. The first lens component consists of three lens elements cemented to each other and the second lens component is in the form of meniscus arranged closely adjacent to the first lens component. At least one of the third and the fourth lens component consists of two lens elements cemented to each other. Each of the fifth and the sixth lens components consists of two lens elements cemented to each other, while the seventh lens component is in the form of a meniscus having a large width. The copying lens satisfies the following conditions:
Inventors
- 👤 K Yuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:52
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
281 words
In a precision copying lens having a first, a second and a third part arranged in order and spaced a distance from each other with said first part located at the object side, said first part having a first lens component consisting of three lens elements cemented to each other and a second lens component in the form of a meniscus located closely adjacent to said first lens component, said second part having a third and a fourth lens component at least one of said third and fourth lens components consisting of two lens elements cemented to each other, said third part having a fifth, a sixth and a seventh lens component, each of said fifth and sixth lens components consisting of two lens elements cemented to each other while said seventh lens component is in the form Of a meniscus having a large thickness and is arranged closely adjacent to said sixth lens component, the improvement wherein said fifth lens component is a doublet and said copying lens satisfies the following conditions: 0.8f < r3 < 1.2f 0.6f <r15< 0.8f 1.0f< r13 < 1.5f 25 < Nu 14 - Nu 13 where: r3 radius of curvature of the cemented surfaces in the first lens component at the image side, r15 radius of curvature of the air interface of the sixth lens component at the object side, Nu 13 Abbe number of the lens element in the fifth lens component at the object side, Nu 14 Abbe number of the lens element in the fifth component at the image side, r13 radius of curvature of the cemented surfaces in the fifth lens group, and f focal length of the entire system.
Claim 2
Dependent Claim
281 words
In a precision copying lens having a first, a second and a third part arranged in order and spaced a distance from each other with said first part located at the object side, said first part having a first lens component consisting of three lens elements cemented to each other and a second lens component in the form of a meniscus located closely adjacent to said first lens component, said second part having a third and a fourth lens component at least one of said third and fourth lens components consisting of two lens elements cemented to each other, said third part having a fifth, a sixth and a seventh lens component, each of said fifth and sixth lens components consisting of two lens elements cemented to each other while said seventh lens component is in the form Of a meniscus having a large thickness and is arranged closely adjacent to said sixth lens component, the improvement wherein said fifth lens component is a doublet and said copying lens satisfies the following conditions: 0.8f < r3 < 1.2f 0.6f <r15< 0.8f 1.0f< r13 < 1.5f 25 < Nu 14 - Nu 13 where: r3 radius of curvature of the cemented surfaces in the first lens component at the image side, r15 radius of curvature of the air interface of the sixth lens component at the object side, Nu 13 Abbe number of the lens element in the fifth lens component at the object side, Nu 14 Abbe number of the lens element in the fifth component at the image side, r13 radius of curvature of the cemented surfaces in the fifth lens group, and f focal length of the entire system.
Claim 3
Dependent Claim
21 words
Precision copying lens according to claim 1, wherein said seventh lens component consists of two lens elements cemented to each other.
Claim 4
Dependent Claim
111 words
Precision copying lens according to claim 2 and satisfying the following numerical data: (f 50) (S'' 5.35)krkdknk Nu k1917.855.531. 253.67012.301.6530662.85 3-42.9985.531.5199166.83 4-181.201.231.6530662.85 572.23412.301. 674.345129.111.6363458.65 7445.876.151. 8122.149.341.6844659.16 9-178.970.611.5814257.57 10107.167.381. 11607.0022.941.6844659.16 12220.079.001. 13-69.5015.501.6530662.85 14287.180.301.6724831.98 1535.0529.841. 16226.414.921.4959375.03 1777.8940.611.6724831.98 1835.9966.001. 1921.41927.201.6724831.98 2017.4711.4959375.031. where: S'' working distance at the image side K 1, 2, - - - 20 indicating the location in order beginning at the object side, rk radius of curvature of the respective surfaces each of the lens elements, dk thickness each of the lens elements and the distance between the adjacent lens elements, nk refractive index each of the lens elements and air, and Nu k Abbe number each of the lens elements.
Claim 5
Dependent Claim
112 words
Precision copying lens according to claim 2 and satisfying the following numerical data: (f 50) (S'' 5.3)krkdknk Nu k1863.435.51. 253.59214.01.6529056.43 3-43.5175.51.5199166.83 4-179.561.21.6530662.85 572.33212.31. 673.163129.11.6530662.85 7397.66.21. 8144.409.31.6844659.16 9-178.470.61.5752663.42 10110.127.41. 11590.4422.91.6844659.16 12227.039.01. 13-68.4075.51.6530662.85 14289.290.31.6724831.98 1535.0839.91. 16240.014.91.4959375.03 1778.1510.61.6724831.98 1835.8206.01. 1921.46227.21.6724831.98 2017.5051.4959375.03 1. where: S'' working distance at the image side, k 1, 2, - - - 20 indicating the location in order beginning at the object side, rk radius of curvature of the respective surfaces each of the lens elements, dk thickness each of the lens elements and the distance between the adjacent lens elements, nk refractive index each of the lens elements and air, and Nu k Abbe number each of the lens elements.
Claim 6
Dependent Claim
77 words
Precision copying lens according to claim 1 and satisfying the following numerical data: (f 50) (S'' 4.7) k rk dk nk Nu k 1 862.80 5.5 1. 2 57.874 14.0 1.57976 66.41 3 -48.839 5.6 1.52163 62.17 4 -169.57 1.2 1.72934 55.72 5 96.448 12.3 1. 6 102.56 129.1 1.65306 62.85 7 239.36 6.2 1. 8 93.737 9.3 1.67248 31.98 9 -182.34 0.6 1.58504 51.14 10 134.08 7.4 1. 11 267.36 23.0 1.68446 59.16 12 456.70 9.0
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |