US3876292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reproduction lens system
Assignee: Meopta np
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Filing: 1973-10-18
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Granted: 1975-04-08
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Expires: 1993-10-18
Abstract
Abstract An objective lens system comprising three optical members arranged axially in such a way that the first member nearest to the image plane consists of a single biconvex lens, the middle member a single biconcave lens and the third member consists of two lenses cemented together, namely a biconcave and a biconvex one. The components have the following conditions: f.sub.B <.vertline.f.sub.C .sbsb.1.vertline.<f.sub.A 0.9 F < (f.sub.A + .vertline.F.sub.B .vertline..sup.+.vertline.f.sub.C .sbsb.1.vertline.) r.sub.6 < r.sub.1 <r.sub.7 (m.sub.1 + d.sub.2) < 1.1 d.sub.1 (m.sub.1 + d.sub.2) < 1.1 m.sub.2 Where
Inventors
- 👤 Stanislav Velesik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:21
CPC Classifications
G; G02; G02B; G02B13/00; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
An optical objective lens system comprising three axially arranged optical members, the first member being arranged nearest to the image plane comprises a single biconvex lens, the middle member comprises a single biconcave lens, and the third member comprises a biconcave lens and a biconvex lens cemented together, said system complying with the following conditions:r.sub.1 = + 25.88 n.sub.e .nu. r.sub.2 = - d.sub.1 = 5.06 1.62554 57.87 r.sub.3 = - m.sub.1 = 3.5 air gap r.sub.4 = + d.sub.2 = 1.44 1.57832 41.04 r.sub.5 = - 113.13 m.sub.2 = 5 air gap r.sub.6 = + d.sub.3 = 1.44 1.52875 50.7 r.sub.7 = - d.sub.4 = 6.63 1.64128 55.29 n.sub.e is the refractive index for the spectral line e, and .nu. is the Abbe number.
Claim 2
Dependent Claim
125 words
An optical objective lens system comprising three axially arranged optical members, the first member being arranged nearest to the image plane comprises a single biconvex lens, the middle member comprises a single biconcave lens, and the third member comprises a biconcave lens and a biconvex lens cemented together, said system complying with the following conditions:r.sub.1 = + 25.88 n.sub.e .nu. r.sub.2 = - d.sub.1 = 5.06 1.62554 57.87 r.sub.3 = - m.sub.1 = 3.5 air gap r.sub.4 = + d.sub.2 = 1.44 1.57832 41.04 r.sub.5 = - 113.13 m.sub.2 = 5 air gap r.sub.6 = + d.sub.3 = 1.44 1.52875 50.7 r.sub.7 = - d.sub.4 = 6.63 1.64128 55.29 n.sub.e is the refractive index for the spectral line e, and .nu. is the Abbe number.
Claim 3
Dependent Claim
10 words
The system according to claim 1 having the following values:
References Cited (Backward Citations)
GB474815A
Cited
DE1017381B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |