Patent US4472023A successfully refreshed from Google Patents.
US4472023A
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High resolution image forming optical system
Assignee: Olympus Corp
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Filing: 1982-06-29
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Granted: 1984-09-18
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Expires: 2002-06-29
Abstract
Abstract A high resolution image forming optical system provided with an annular aperture stop arranged near the front side focal plane of a condenser lens and an annular filter arranged in a position conjugate with the annular aperture stop with respect to the optical system including the condenser lens and an objective in order to improve the image-forming performance.
Inventors
- 👤 Kimiaki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:05
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/58; G02B21/00; G02B21/06; G02B21/08; G02B21/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A high resolution optical system comprising a condenser lens, an annular aperture stop arranged near the front side focal plane of said condenser lens, an objective arranged on the opposite side of said annular aperture stop with respect to said condenser lens, and an annular filter arranged in a position conjugate with said annular aperture stop with respect to the optical system including said condenser lens and objective, said annular filter being formed so as to absorb a part of the zero order diffracted light and to give a phase advance of θ≦(π)/6 to other diffracted light than the zero order light.
Claim 2
Dependent Claim
102 words
A high resolution optical system comprising a condenser lens, an annular aperture stop arranged near the front side focal plane of said condenser lens, an objective arranged on the opposite side of said annular aperture stop with respect to said condenser lens, and an annular filter arranged in a position conjugate with said annular aperture stop with respect to the optical system including said condenser lens and objective, said annular filter being formed so as to absorb a part of the zero order diffracted light and to give a phase advance of θ≦(π)/6 to other diffracted light than the zero order light.
References Cited (Backward Citations)
US3476457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |