Wide angle lens
Abstract
Abstract A WIDE ANGLE OBJECTIVE LENS HAVING AT LEAST FIVE LENS MEMBERS SEPARATED BY AIR SPACES, OF WHICH TWO CONVERGING LENS MEMBERS, SEPARATED BY A DIAPHRAGM SPACE, ARE FOLLOWED ON THE OBJECT SIDE BY AT LEAST TWO DIVERGING LENS MEMBERS, AND ON THE IMAGE SIDE BY AT LEAST ONE DIVERGING LENS MEMBER, IN WHICH THE AXIAL AIR SPACE BETWEEN THE CONVERGING LENS MEMBER ON THE OBJECT SIDE AND THE PRECEDED DIVERGING MENISCUS LIES BETWEEN 0.002 F AND 0.050 F, AND IN WHICH THE NUMERICAL VALUE OF THE PRODUCT OF THE RATIO OF THE DIFFERENCE BETWEEN THE RADII OF CURVATURE OF THE BOUNDING SURFACES OF THE SAID AIR SPACE TO THE LENGTH OF THE AIR SPACE, AND THE RATIO OF THE RADIUS OF CURVATURE OF THE INNER OF SAID BOUNDING SURFACES TO THE RADIUS OF CURVATURE OF THE CONVEX SURFACE OF THE PAIR OF SURFACES CONCAVE TOWARDS THE DIAPHRAGM IN THE CONVERGING LENS MEMBER ON THE IMAGE SIDE, LIES BETWEEN 1.60 AND 3.9.
Inventors
- 👤 Ludwig Bertele
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |