US4938573A
Expired / Lapsed
US
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Objective lens system
Assignee: Olympus Corp
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Filing: 1989-07-03
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Granted: 1990-07-03
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Expires: 2009-07-03
Abstract
Abstract An objective lens system consisting of a single lens component, comprising at least one aspherical surface and having aberrations corrected favorably within a range up to relatively high image height.
Inventors
- 👤 Yoshiharu Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:12
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
An objective lens system consisting of a single lens component of a cemented doublet, comprising a first surface concave on the object side, a second surface convex on the object side and a third surface convex on the image side arranged in the order from the object side, said first surface and said second surface being designed as aspherical surfaces, and so designed as to satisfy the following condition (1): -0.2>r.sub.3 /f>-0.8 (1) wherein the reference symbol r 3 represents radius of curvature on the third surface and the reference symbol f designates focal length of the objective lens system as a whole.
Claim 2
Dependent Claim
103 words
An objective lens system consisting of a single lens component of a cemented doublet, comprising a first surface concave on the object side, a second surface convex on the object side and a third surface convex on the image side arranged in the order from the object side, said first surface and said second surface being designed as aspherical surfaces, and so designed as to satisfy the following condition (1): -0.2>r.sub.3 /f>-0.8 (1) wherein the reference symbol r 3 represents radius of curvature on the third surface and the reference symbol f designates focal length of the objective lens system as a whole.
Claim 3
Dependent Claim
68 words
An objective lens system according to claim 1 further satisfying the following conditions (3) and (4): ##EQU4## wherein the reference symbols r 1 and r 2 represent radii of curvature on the first surface and the second surface respectively, and the reference symbols ν 1 and ν 2 designates Abbe's numbers of the object side lens element and the image side lens element respectively of the cemented doublet.
Claim 4
Dependent Claim
90 words
An objective lens system consisting of a single lens component of a cemented doublet, comprising a first surface convex on the object side, a second surface convex on the object side and a third surface designed as an aspherical surface, and so designed as to satisfy the following condition (2): one of r.sub.3 /f<-2 and 0<r.sub.3 /f (2) wherein the reference symbol r 3 radius of curvature at the vertex of the third surface and the reference symbol f designates focal length of the objective lens system as a whole.
Claim 5
Dependent Claim
90 words
An objective lens system consisting of a single lens component of a cemented doublet, comprising a first surface convex on the object side, a second surface convex on the object side and a third surface designed as an aspherical surface, and so designed as to satisfy the following condition (2): one of r.sub.3 /f<-2 and 0<r.sub.3 /f (2) wherein the reference symbol r 3 radius of curvature at the vertex of the third surface and the reference symbol f designates focal length of the objective lens system as a whole.
Claim 6
Dependent Claim
72 words
An objective lens system according to claim 3 further satisfying the following conditions (5), (6) and (7): ##EQU5## wherein the reference symbols r 1 and r 2 represent radii of curvature on the first surface and the second surface respectively (radius of curvature at the vertex when the surface is designed as an aspherical surface), and the reference symbol D designates distance as measured from the object surface to the first surface.
Claim 7
Dependent Claim
18 words
An objective lens system according to claim 4 wherein the first surface is designed as an aspherical surface.
Claim 8
Dependent Claim
18 words
An objective lens system according to claim 4 wherein the second surface is designed as an aspherical surface.
References Cited (Backward Citations)
GB191503020A
Cited
JPS613110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |