US4930880A
Expired / Lapsed
US
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Graded refractive index lens
Assignee: Olympus Corp
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Filing: 1989-10-06
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Granted: 1990-06-05
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Expires: 2009-10-06
Abstract
Abstract A graded refractive index lens having refractive index distribution in the direction along the optical axis, a meniscus shape and a capability to correct aberrations, especially chromatic aberration.
Inventors
- 👤 Yuji Miyauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0087
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, and so designed as to satisfy the following conditions (1) and (2): (1) -1.5<(f p γ p +f n γ n )/(γ p +γ n )d<4.5 (2) |f p /f n >0.6 wherein the reference symbol f p represents an inverse number of the power at the vertex of the convex surface of said lens, the reference symbol f n designates an inverse number of the power at the vertex of the concave surface of said lens, the reference symbol γ p denotes Abbe's number at the vertex of the convex surface of said lens, the reference symbol γ n represents Abbe's number at the vertex of the concave surface of said lens and the reference symbol d designates thickness of said lens.
Claim 2
Dependent Claim
139 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, and so designed as to satisfy the following conditions (1) and (2): (1) -1.5<(f p γ p +f n γ n )/(γ p +γ n )d<4.5 (2) |f p /f n >0.6 wherein the reference symbol f p represents an inverse number of the power at the vertex of the convex surface of said lens, the reference symbol f n designates an inverse number of the power at the vertex of the concave surface of said lens, the reference symbol γ p denotes Abbe's number at the vertex of the convex surface of said lens, the reference symbol γ n represents Abbe's number at the vertex of the concave surface of said lens and the reference symbol d designates thickness of said lens.
Claim 3
Dependent Claim
31 words
A graded refractive index lens according to claim 1 further satisfying the following conditions (3) through (5): (3) γ p -γ n >7 (4) γ p <100 (5) γ n >20
Claim 4
Dependent Claim
21 words
A graded refractive index lens according to claim 2 further satisfying the following condition (6): (6) γ p γ n <50.
Claim 5
Dependent Claim
84 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, having a meniscus shape, and so designed as to satisfy the following conditions (3) through (5): (3) γ p -γ n >7 (4) γ p <100 (5) γ n >20 wherein the reference symbol γ p represent Abbe's number at the vertex of the convex surface of said lens and the reference symbol γ n designates Abbe's number at the vertex of the concave surface of said lens.
Claim 6
Dependent Claim
84 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, having a meniscus shape, and so designed as to satisfy the following conditions (3) through (5): (3) γ p -γ n >7 (4) γ p <100 (5) γ n >20 wherein the reference symbol γ p represent Abbe's number at the vertex of the convex surface of said lens and the reference symbol γ n designates Abbe's number at the vertex of the concave surface of said lens.
Claim 7
Dependent Claim
134 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, having a meniscus shape, and so designed as to satisfy the following conditions (2), (3) and (6): (2) f p /f n >0.6 (3) γ p -γ n >7 (6) 50 >γ p -γ n , wherein the refrence symbol f p represents an inverse number of the power at the vertex of the convex surface of said lens, the reference symbol f n designates an inverse number of the power at the vertex of the concave surface of said lens, the reference symbol γ p denotes Abbe's number at the vertex of the convex surface of said lens and the reference symbol γ n represents Abbe's number at the vertex of the concave surface of said lens.
Claim 8
Dependent Claim
134 words
A graded refractive index lens having refractive index distribution in the direction along the optical axis, having a meniscus shape, and so designed as to satisfy the following conditions (2), (3) and (6): (2) f p /f n >0.6 (3) γ p -γ n >7 (6) 50 >γ p -γ n , wherein the refrence symbol f p represents an inverse number of the power at the vertex of the convex surface of said lens, the reference symbol f n designates an inverse number of the power at the vertex of the concave surface of said lens, the reference symbol γ p denotes Abbe's number at the vertex of the convex surface of said lens and the reference symbol γ n represents Abbe's number at the vertex of the concave surface of said lens.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |