US3790255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens system
Assignee: American Optical Corp
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Filing: 1972-09-11
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Granted: 1974-02-05
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Expires: 1992-09-11
Abstract
Abstract An eight component afocal zoom system is provided characterized by extremely short length considering the zoom range and its field and aperture size. A substantially flat image field is obtained through a zoom range of substantially to 2.54.
Inventors
- 👤 A Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:22
CPC Classifications
G; G02; G02B; G02B15/00; G02B21/00; G02B21/02; G02B21/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
An afocal optical lens system of the zoom type having an extremely short length and a range for use with an infinity correcting microscope system in which the image, as well as being well corrected for chromatic abberations, coma, and astigmatism, has a substantially flat image field through a zoom range of substantially 1 to 2.5X, said system comprised of three sets of lenses, XI, XII, and XIII; XI being comprised of a positive convex doublet consisting of a double convex lens cemented to a concave convex negative lens, and a second concave convex negative lens; XII is comprised of a negative double concave singlet, a convex concavo negative singlet and a negative double concave doublet, said doublet comprised of a concave convex positive element cemented to a double concave lens element; and XIII comprised of a concavo convex positive doublet comprised of two concavo convex singlets cemented to each other, a double convex positive singlet and a double concave negative singlet.
Claim 2
Dependent Claim
162 words
An afocal optical lens system of the zoom type having an extremely short length and a range for use with an infinity correcting microscope system in which the image, as well as being well corrected for chromatic abberations, coma, and astigmatism, has a substantially flat image field through a zoom range of substantially 1 to 2.5X, said system comprised of three sets of lenses, XI, XII, and XIII; XI being comprised of a positive convex doublet consisting of a double convex lens cemented to a concave convex negative lens, and a second concave convex negative lens; XII is comprised of a negative double concave singlet, a convex concavo negative singlet and a negative double concave doublet, said doublet comprised of a concave convex positive element cemented to a double concave lens element; and XIII comprised of a concavo convex positive doublet comprised of two concavo convex singlets cemented to each other, a double convex positive singlet and a double concave negative singlet.
Claim 3
Dependent Claim
198 words
The zoom lens arrangement of claim 1 in which the parameters of lens radii (R), thicknesses (T), and spacings (S) are expressed in millimeters and a negative sign indicates lens radii on centers of curvature on the object side of the lens Radius Thickness Space Refractive Abbe R T S Index Number ND Nu S1 0.0927L R1 0.3154L T1 0.0397L ND1 1.51821 Nu 1 65.10 R2 -0.2636L T2 0.0199L ND2 1.80518 Nu 2 25.43 R3 -0.3885L S2 0.0751L R4 -0.3324L T3 0.199L ND3 1.78847 Nu 3 50.48 R5 -0.8341L (1.0X) S3 0.559L (1.7X) S3 0.1317L (2.5X) S3 0.1664L R6 -1.1806L T4 0.0187L ND4 1.51821 Nu 4 65.10 R7 0.3284L S4 0.0227L R8 0.1644LT5 0.0368L ND5 1.80518 Nu 5 25.43 R9 0.1644L S5 0.0258L R10 -0.4546L T6 0.0275L ND6 1.80518 Nu 6 25.43 R11 -0.1422L T7 0.0205L ND7 1.78847 Nu 7 50.48 R12 0.4384L (1.0X) S6 0.2961L (1.7X) S6 0.1675L (2.5X) S6 0.0203L R13 -7.9799L T8 0.1003L ND8 1.78847 Nu 8 50.48 R14 -0.2443L T9 0.0311L ND9 1.80518 Nu 9 25.43 R15 -0.6294L S7 0.0037L R16 0.3880L T10 0.0572L ND10 1.61772 Nu 10 49.78 R17 -1.7885L S8 0.0247L R18 -1.0210L T11 0.0317L ND11 1.48749 Nu 11 70.45 R19 0.3283L
Claim 4
Dependent Claim
11 words
The zoom system of claim 2 in which L 75.48 millimeters.
References Cited (Backward Citations)
US3030861A
Cited
US3640605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |