US4002406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope condenser
Assignee: American Optical Corp
•
Filing: 1975-12-08
•
Granted: 1977-01-11
•
Expires: 1995-12-08
Abstract
Abstract A microscope condenser of the Abbe type has the optical characteristics of the biconvex singlet followed by the convex-plano singlet improved by making the first surface of the biconvex singlet aspherical. The aspherical surface substantially reduces spherical aberration and coma as well as pupillary aberration of the condenser.
Inventors
- 👤 Milton H. Sussman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:10
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/086; G02B9/00; G02B9/04; G02B9/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
173 words
An improved microscope condenser having a front focal plane external to the glass comprising, in sequence, a bioconvex positive singlet I and a convex-plano positive singlet II aligned along an optical axis, which singlets have parameters of lens radii (R), and minus sign (-) indicates center of curvature on the pupil side of the lens, thickness (T), spacing (S), index of refraction (ND and Abbe number (ν) as follows: ______________________________________
Index of
Abbe
Lens Radius Thickness
Spacing
Refraction
Number
______________________________________
S.sub.0 =
0.5828X
R.sub.1 =
1.4794X
I T.sub.1 = 1.522<ND.sub.1
ν.sub.1 ≅58
0.7869X <1.524
R.sub.2 =
-6.5954X
S.sub.1 =
0.0095X
R.sub.3 =
0.7313X
II T.sub.2 = 1.522<ND.sub.2
ν.sub.2 ≅58
1.0618X <1.524
R = ∞
S.sub.2 =
0.0381X
______________________________________ wherein X is 9 to 11mm, the surface having radius R 1 is axially symmetrical aspherical with a conic coefficient (k) of -1.sup.. 0 and deformation coefficients d of +0.229394.sup.. 10 - 6 , e of -0.906333.sup.. 10 - 7 , f of +0.105699 .sup.. 10 - 8 and g of -0.139724.sup.. 10 - 10
Claim 2
Dependent Claim
173 words
An improved microscope condenser having a front focal plane external to the glass comprising, in sequence, a bioconvex positive singlet I and a convex-plano positive singlet II aligned along an optical axis, which singlets have parameters of lens radii (R), and minus sign (-) indicates center of curvature on the pupil side of the lens, thickness (T), spacing (S), index of refraction (ND and Abbe number (ν) as follows: ______________________________________
Index of
Abbe
Lens Radius Thickness
Spacing
Refraction
Number
______________________________________
S.sub.0 =
0.5828X
R.sub.1 =
1.4794X
I T.sub.1 = 1.522<ND.sub.1
ν.sub.1 ≅58
0.7869X <1.524
R.sub.2 =
-6.5954X
S.sub.1 =
0.0095X
R.sub.3 =
0.7313X
II T.sub.2 = 1.522<ND.sub.2
ν.sub.2 ≅58
1.0618X <1.524
R = ∞
S.sub.2 =
0.0381X
______________________________________ wherein X is 9 to 11mm, the surface having radius R 1 is axially symmetrical aspherical with a conic coefficient (k) of -1.sup.. 0 and deformation coefficients d of +0.229394.sup.. 10 - 6 , e of -0.906333.sup.. 10 - 7 , f of +0.105699 .sup.. 10 - 8 and g of -0.139724.sup.. 10 - 10
Claim 3
Dependent Claim
26 words
The condenser of claim 1 wherein X is 10.5mm, ND 1 is 1.523, ND 2 is 1.523, ν 1 is 58.6 and ν 2 is 58.6.
References Cited (Backward Citations)
US3355234A
Cited
US3598474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |