US5005960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay lens system with four optical elements in symmetrical arrangement
Assignee: MED INVENTIO AG SEESTRASSE 359 CH-8036 ZURICH
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Filing: 1988-03-17
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Granted: 1991-04-09
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Expires: 2008-03-17
Abstract
Abstract What is described here is a relay lens system, specifically for endoscopes or the like, comprising two rod-type lens elements and two further optical elements in symmetrical arrangement relative to the center plane of the object plane and the image plane. The relay lens system according to the present invention is characterized by the fact that the rod-type lens elements are individual convex/concave optical elements and the further elements are individual bi-convex optical elements, and that one rod-type lens and one further lens, respectively, are bonded to each other. This structure according to the present invention contributes to an enhanced compensation, specifically of the field curvature and astigmatism, while furnishing a brighter image.
Inventors
- 👤 Hans J. Heimbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:48
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2407; G02B23/2446
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
Relay lens system for endoscopes, comprising two rod-type lens elements and two further optical elements therebetween in symmetrical arrangement relative to a center plane of symmetry between the two rod-type lens elements and two further optical elements, wherein the rod-type lens elements are individual convex/concave lens elements with concave surfaces which face the center plane, while the two further optical elements are individual bi-convex lens elements, one of said two rod-type lens elements and one of said two further optical elements being bonded to each other.
Claim 2
Dependent Claim
86 words
Relay lens system for endoscopes, comprising two rod-type lens elements and two further optical elements therebetween in symmetrical arrangement relative to a center plane of symmetry between the two rod-type lens elements and two further optical elements, wherein the rod-type lens elements are individual convex/concave lens elements with concave surfaces which face the center plane, while the two further optical elements are individual bi-convex lens elements, one of said two rod-type lens elements and one of said two further optical elements being bonded to each other.
Claim 3
Dependent Claim
35 words
Lens system according to claim 1, wherein the following relationship applies for the Abbe number v ds of the rod-type lens elements and the Abbe number v dw of the further lens: v.sub.dw -v.sub.ds >6.
Claim 4
Dependent Claim
21 words
Lens system according to claim 1, wherein the further lenses rest upon each other in the area of their surface vertex.
Claim 5
Dependent Claim
34 words
Lens system according to claim 1, wherein an optical flat is provided in the area of the center plane of the lens system, the surface apeces of said further lenses resting upon said flat.
Claim 6
Dependent Claim
73 words
Lens system according to claim 1, wherein the following condition is satisfied: f'*(Θ.sub.2 +Θ.sub.3 +Θ.sub.4)>1 wherein: Θ 2 =refractive power of the concave surface of the rod-type lens, Θ 3 =refractive power of the surface of the further lens, which is bonded to the concave surface, Θ 4 =refractive power of the surface of the further lens, which faces the center plane, and f'=focal distance of the system composed of these three surfaces.
Claim 7
Dependent Claim
32 words
Lens system according to claim 1 wherein the following condition is satisfied: n.sub.w <n.sub.s wherein: n w =refractive index of the further lens, and n s =refractive index of the rod-type lens.
Claim 8
Dependent Claim
13 words
Lens system according to claim 6, wherein the following relationship applies: 0.01<(n.sub.s -n.sub.w)<0.06.
Claim 9
Dependent Claim
47 words
Lens system according to claim 1, characterized by the following data: ______________________________________
Refractive
Abbe
Surface Radius Thickness Index Number
______________________________________
1 13.3 26.66 1.85 23.8
2 8.04 2.3 1.81 31.6
3 -14.4 0 1
4 14.4 2.3 1.81 31.6
5 -8.04 26.66 1.85 23.8
6 -13.3
______________________________________
Claim 10
Dependent Claim
47 words
Lens system according to claim 1, characterized by the following data: ______________________________________
Refractive
Abbe
Surface Radius Thickness Index Number
______________________________________
1 12.38 25.95 1.74 28.2
2 7.6 3.1 1.70 38.6
3 -13.0 0 1
4 13.0 3.1 1.70 38.6
5 -7.6 25.95 1.74 28.2
6 -12.38
______________________________________
Claim 11
Dependent Claim
47 words
Lens system according to claim 1, characterized by the following data: ______________________________________
Refractive
Abbe
Surface Radius Thickness Index Number
______________________________________
1 11.1 24.5 1.62 36.3
2 4.2 4.5 1.61 46.4
3 -12.5 0 1
4 12.5 4.5 1.61 46.4
5 -4.2 24.5 1.62 36.3
6 -11.1
______________________________________
Claim 12
Dependent Claim
47 words
Lens system according to claim 1, characterized by the following data: ______________________________________
Refractive
Abbe
Surface Radius Thickness Index Number
______________________________________
1 11.1 28.1 1.62 36.3
2 6.9 0.9 1.59 48.4
3 -11.6 0.01 1
4 11.6 0.9 1.59 48.4
5 -6.9 28.1 1.62 36.3
6 -11.1
______________________________________
Claim 13
Dependent Claim
35 words
Lens system according to claim 1, wherein the following relationship applies for the Abbe number v ds of the rod-type lens elements and the Abbe number v dw of the further lenses: v.sub.dw -v.sub.ds >10.
Claim 14
Dependent Claim
17 words
Lens system according to claim 1, wherein the further lenses are mutually spaced by an air gap.
References Cited (Backward Citations)
GB1443150A
Cited
US4693568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |