Patent US5253117A successfully refreshed from Google Patents.
US5253117A
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Reflecting objective system
Assignee: Olympus Corp
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Filing: 1992-08-31
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Granted: 1993-10-12
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Expires: 2012-08-31
Abstract
Abstract A reflecting objective system comprising three or more spherical reflecting mirrors arranged symmetrically with regard to an optical axis common thereto and has spherical aberration corrected very favorably. By using a single or plural aspherical surfaces, this reflecting objective system can be modified so as to comprise two or more reflecting mirrors and correct not only the spherical aberration but also the offaxial aberrations.
Inventors
- 👤 Shingo Kashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:58
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0626; G02B17/0631; G02B17/0605; G02B17/061; G02B17/0647; G02B17/0652; G02B21/00; G02B21/02; G02B21/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A reflecting objective system comprising, in the travelling order of light incident from the object side: a first spherical reflecting mirror; a second spherical reflecting mirror; and a third spherical reflecting mirror disposed symmetrically with respect to an optical axis common thereto; said first spherical reflecting mirror and said second spherical reflecting mirror having positive optical powers; said third spherical reflecting mirror having a negative optical power; said reflecting objective system satisfying the following condition (1): ≦| r.sub.2 /r.sub.3 |·(f/L.sub.23)≦9 (1) wherein the reference symbol r 2 represents the radius of curvature on said second spherical reflecting mirror, the reference symbol r 3 designates the radius of curvature on said third spherical reflecting mirror, the reference symbol f denotes the focal length of the reflecting objective system and the reference symbol L 23 represents the optical distance between the second reflecting mirror and the third reflecting mirror.
Claim 2
Dependent Claim
147 words
A reflecting objective system comprising, in the travelling order of light incident from the object side: a first spherical reflecting mirror; a second spherical reflecting mirror; and a third spherical reflecting mirror disposed symmetrically with respect to an optical axis common thereto; said first spherical reflecting mirror and said second spherical reflecting mirror having positive optical powers; said third spherical reflecting mirror having a negative optical power; said reflecting objective system satisfying the following condition (1): ≦| r.sub.2 /r.sub.3 |·(f/L.sub.23)≦9 (1) wherein the reference symbol r 2 represents the radius of curvature on said second spherical reflecting mirror, the reference symbol r 3 designates the radius of curvature on said third spherical reflecting mirror, the reference symbol f denotes the focal length of the reflecting objective system and the reference symbol L 23 represents the optical distance between the second reflecting mirror and the third reflecting mirror.
Claim 3
Dependent Claim
76 words
A reflecting objective system comprising, in the travelling order of light incident from the object side: a first spherical reflecting mirror; a second spherical reflecting mirror; and a third spherical reflecting mirror disposed symmetrically with respect to an optical axis common thereto; said first spherical reflecting mirror and said second spherical reflecting mirror having positive optical powers; said third spherical reflecting mirror having a negative optical power; said reflecting objective system satisfying the following condition (2):
Claim 4
Dependent Claim
76 words
A reflecting objective system comprising, in the travelling order of light incident from the object side: a first spherical reflecting mirror; a second spherical reflecting mirror; and a third spherical reflecting mirror disposed symmetrically with respect to an optical axis common thereto; said first spherical reflecting mirror and said second spherical reflecting mirror having positive optical powers; said third spherical reflecting mirror having a negative optical power; said reflecting objective system satisfying the following condition (2):
Claim 5
Dependent Claim
60 words
02≦|2/r 1 |·(L 23 2 /f)≦0.3 (2) wherein the reference symbol r 1 represents the radius of curvature on said first spherical reflecting mirror, the reference symbol f designates the focal length of the reflecting objective system as a whole, and the reference symbol L 23 denotes the optical distance between the second reflecting mirror and the third reflecting mirror.
Claim 6
Dependent Claim
60 words
02≦|2/r 1 |·(L 23 2 /f)≦0.3 (2) wherein the reference symbol r 1 represents the radius of curvature on said first spherical reflecting mirror, the reference symbol f designates the focal length of the reflecting objective system as a whole, and the reference symbol L 23 denotes the optical distance between the second reflecting mirror and the third reflecting mirror.
Claim 7
Dependent Claim
50 words
A reflecting objective system according to claim 1 wherein the light coming from an object is reflected by said first spherical reflecting mirror, the second spherical reflecting mirror, the first spherical reflecting mirror and the third spherical reflecting mirror in this order, and then emerges from said reflecting objective system.
Claim 8
Dependent Claim
50 words
A reflecting objective system according to claim 2 wherein the light coming from an object is reflected by said first spherical reflecting mirror, the second spherical reflecting mirror, the first spherical reflecting mirror and the third spherical reflecting mirror in this order, and then emerges from said reflecting objective system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |