Patent US3227042A successfully refreshed from Google Patents.
US3227042A
Expired / Lapsed
US
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Projection objective of continuously variable focal length
Assignee: Meopta np
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Filing: 1962-10-12
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Granted: 1966-01-04
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Expires: 1982-10-12
Abstract
No abstract record available.
Inventors
- 👤 Smejkal Vilem
- 👤 Pospisil Ladislav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/143; G02B15/1435; G02B15/143507
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
218 words
A PROJECTION LENS SYSTEM OF CONTINUOUSLY VARIABLE FOCAL LENGTH COMPRISING, IN COMBINATION: (A) A FIXED NEGATIVE FRONT COMPONENT, (1) SAID FRONT COMPONENT BEING AN AIR SPACED DOUBLET INCLUDING A DIVERGENT LENS AS A FRONT ELEMENT AND A CONVERGENT LENS, (2) THE REFRACTIVE INDEX ND OF SAID DIVERGENT LENS BEING SMALLER THAN THE CORRESPONDING REFRACTIVE INDEX OF SAID CONVERGENT LENS BY AT LEAST 0.12, (3) THE FIRST RADIUS OF CURVATURE OF SAID DIVERGENT LENS BEING SMALLER THAN 0.6 TIMES THE NUMERICAL VALUE OF THE FOCAL LENGTH OF SAID FRONT COMPONENT; (B) A FIXED POSITIVE REAR COMPONENT AXIALLY SPACED FROM SAID FRONT COMPONENT, (1) SAID REAR COMPONENT HAVING TWO CONVERGENT OUTER LENSES AND A DIVERGENT LENS INTERPOSED BETWEEN SAID OUTER LENSES, SAID LENSES OF SAID REAR COMPONENT BEING AIR SPACED ELEMENTS; AND (C) AN ACHROMATIC POSITIVE COMPONENT COAXIALLY MOVABLY INTERPOSED BETWEEN SAID FRONT AND REAR COMPONENTS, (1) SAID ACHROMATIC COMPONENT BEING A CEMENTED DOUBLET HAVING DIVERGENT FRONT ELEMENT AND A CONVERGENT REAR ELEMENT, (2) THE NUMERICAL VALUE OF THE FOCAL LENGTH OF SAID FRONT COMPONENT BEING GREATER THAN THE FOCAL LENGTH OF SAID REAR COMPONENT AND GREATER THAN THE FOCAL LENGTH OF SAID ACHROMATIC COMPONENT, AND (3) THE RATIO OF THE FOCAL LENGTH OF SAID ACHROMATIC COMPONENT TO THE FOCAL LENGTH OF SAID REAR COMPONENT BEING BETWEEN 1.8 AND 0.8.
Claim 2
Dependent Claim
218 words
A PROJECTION LENS SYSTEM OF CONTINUOUSLY VARIABLE FOCAL LENGTH COMPRISING, IN COMBINATION: (A) A FIXED NEGATIVE FRONT COMPONENT, (1) SAID FRONT COMPONENT BEING AN AIR SPACED DOUBLET INCLUDING A DIVERGENT LENS AS A FRONT ELEMENT AND A CONVERGENT LENS, (2) THE REFRACTIVE INDEX ND OF SAID DIVERGENT LENS BEING SMALLER THAN THE CORRESPONDING REFRACTIVE INDEX OF SAID CONVERGENT LENS BY AT LEAST 0.12, (3) THE FIRST RADIUS OF CURVATURE OF SAID DIVERGENT LENS BEING SMALLER THAN 0.6 TIMES THE NUMERICAL VALUE OF THE FOCAL LENGTH OF SAID FRONT COMPONENT; (B) A FIXED POSITIVE REAR COMPONENT AXIALLY SPACED FROM SAID FRONT COMPONENT, (1) SAID REAR COMPONENT HAVING TWO CONVERGENT OUTER LENSES AND A DIVERGENT LENS INTERPOSED BETWEEN SAID OUTER LENSES, SAID LENSES OF SAID REAR COMPONENT BEING AIR SPACED ELEMENTS; AND (C) AN ACHROMATIC POSITIVE COMPONENT COAXIALLY MOVABLY INTERPOSED BETWEEN SAID FRONT AND REAR COMPONENTS, (1) SAID ACHROMATIC COMPONENT BEING A CEMENTED DOUBLET HAVING DIVERGENT FRONT ELEMENT AND A CONVERGENT REAR ELEMENT, (2) THE NUMERICAL VALUE OF THE FOCAL LENGTH OF SAID FRONT COMPONENT BEING GREATER THAN THE FOCAL LENGTH OF SAID REAR COMPONENT AND GREATER THAN THE FOCAL LENGTH OF SAID ACHROMATIC COMPONENT, AND (3) THE RATIO OF THE FOCAL LENGTH OF SAID ACHROMATIC COMPONENT TO THE FOCAL LENGTH OF SAID REAR COMPONENT BEING BETWEEN 1.8 AND 0.8.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |