Patent US3623792A successfully refreshed from Google Patents.
US3623792A
Expired / Lapsed
US
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Objective lens for a microscope
Assignee: Olympus Corp
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Filing: 1970-02-11
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Granted: 1971-11-30
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Expires: 1990-02-11
Abstract
Abstract Objective lens for a microscope of dry system high magnification having a leading lens element or group of which the lens element forming the air contacting surface at the image side is made of a glass having a high refractive index equal to or higher than 1.72 and a low index of dispersion equal to or higher than 50, the refracting surface at the object side of the lens element or group immediately succeeding the leading lens element or group being made convex toward the object while the amount of the airgap between the rearmost lens element or group and the lens element or group immediately preceding the rearmost than element or group is made equal to or greater than 0.7 times the focal length of the entire optical system of the objective lens, so that the various aberrations particularly the astigmatism and the curvature of field are widely compensated for.
Inventors
- 👤 Toshifumi Uetake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:04
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
358 words
Objective lens for a microscope comprised of a leading lens component, a lens component immediately succeeding said leading lens component with an airgap provided therebetween and a rearmost lens component with an airgap provided between the same and a lens component immediately preceding said rearmost lens component, wherein the improvement comprises the fact that the air-contacting surface of said leading lens component at the image side thereof is formed by a lens element of said leading lens component which is made of a glass material having a high refractive index and a low index of dispersion satisfying the following requirements: nd 1.72 Nu d 50 where nd and Nu d designate the refractive index and the index of dispersion, respectively, the refracting surface at the object side of said lens component immediately succeeding said leading lens component being made convex toward the direction of the object, the amount D of the airgap between said rearmost lens component and said lens component immediately preceding said rearmost lens component satisfying the following requirement: 0.7F D where F designates the focal length of the entire optical system of said objective lens, said lens having the following numerical data: gamma d nd Nu d 1 infinity 0.669 1.523 60.0 2 - 24.1 1.7 1.0 3 - 9.25 1.9 1.699 30.0 4 3.54 0.25 1.789 51.0 5 + 12.4 0.67 1.0 6 + 5.32 1.70 1.785 26.0 7 - 7.02 4.30 1.486 82.0 8 + 20.7 0.99 1.0 9 + 5.85 1.99 1.717 48.0 10 - 12.5 1.488 70.0 1.0 Thickness of Cover Glass S1 -0.17 Magnification B -40.0X Numerical Aperture N.A. 0.65 where gamma and d designate the radius of curvature of the lens elements including cover glass and the thickness of the lens elements or the amount of the airgap between the adjacent two lens elements including cover glass, respectively, and nd and Nu d designate the refractive index and the index of dispersion of the lens elements including cover glass, respectively, while the numerals at the leftmost column designate the order of the arrangement of the lens elements including cover glass beginning at the side of the leading lens element.
Claim 2
Dependent Claim
358 words
Objective lens for a microscope comprised of a leading lens component, a lens component immediately succeeding said leading lens component with an airgap provided therebetween and a rearmost lens component with an airgap provided between the same and a lens component immediately preceding said rearmost lens component, wherein the improvement comprises the fact that the air-contacting surface of said leading lens component at the image side thereof is formed by a lens element of said leading lens component which is made of a glass material having a high refractive index and a low index of dispersion satisfying the following requirements: nd 1.72 Nu d 50 where nd and Nu d designate the refractive index and the index of dispersion, respectively, the refracting surface at the object side of said lens component immediately succeeding said leading lens component being made convex toward the direction of the object, the amount D of the airgap between said rearmost lens component and said lens component immediately preceding said rearmost lens component satisfying the following requirement: 0.7F D where F designates the focal length of the entire optical system of said objective lens, said lens having the following numerical data: gamma d nd Nu d 1 infinity 0.669 1.523 60.0 2 - 24.1 1.7 1.0 3 - 9.25 1.9 1.699 30.0 4 3.54 0.25 1.789 51.0 5 + 12.4 0.67 1.0 6 + 5.32 1.70 1.785 26.0 7 - 7.02 4.30 1.486 82.0 8 + 20.7 0.99 1.0 9 + 5.85 1.99 1.717 48.0 10 - 12.5 1.488 70.0 1.0 Thickness of Cover Glass S1 -0.17 Magnification B -40.0X Numerical Aperture N.A. 0.65 where gamma and d designate the radius of curvature of the lens elements including cover glass and the thickness of the lens elements or the amount of the airgap between the adjacent two lens elements including cover glass, respectively, and nd and Nu d designate the refractive index and the index of dispersion of the lens elements including cover glass, respectively, while the numerals at the leftmost column designate the order of the arrangement of the lens elements including cover glass beginning at the side of the leading lens element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |