US3192829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Varifocal lens system of wide varifocal range
Assignee: Individual
•
Filing: 1961-06-16
•
Granted: 1965-07-06
•
Expires: 1981-06-16
Abstract
No abstract record available.
Inventors
- 👤 Yamaji Keizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/145; G02B15/1451; G02B15/145121
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
6T3<1/2(T2+T4)<0.9T3
Claim 2
Dependent Claim
1 words
8$F3$<D24<3.2$F3$
Claim 3
Dependent Claim
206 words
A VARIFOCAL LENS SYSTEM HAVING A MOVABLE AND A FIXED PORTION ARRANGED ON A COMMON OPTICAL AXIS, THE MOVABLE PORTION COMPRISING THREE AXIALLY SPACED LENS COMPONENTS, EACH OF THE OUTER TWO COMPONENTS OF THE MOVABLE PORTION HAVING A REFRACTIVE POWER OF THE SAME SIGN AND EQUAL TO THE OTHER IN MAGNITUDE, EACH OF THE OUTER COMPONENTS OF THE MOVABLE PORTION ALSO BEING MOVABLE AN AMOUNT DIRECTLY PROPORTIONAL TO THE AMOUNT THE INNER COMPONENT OF THE MOVABLE PORTION IS MOVED AT ALL STAGES OF COMPONENT MOVEMENT, THE INNER COMPONENT HAVING A REFRACTIVE POWER OF SIGN OPPOSITE TO THAT OF EACH OUTER COMPONENT, THE FIXED PORTION COMPRISES TWO LENS COMPONENTS OF WHICH ONE IS IN FRONT OF AND THE OTHER IS TO THE REAR OF THE MOVABLE PORTION, THE FOCAL LENGTH OF THE FIXED FRONT LENS COMPONENT BEING EQUAL TO THAT OF THE FIXED REAR LENS COMPONENT, THE FIXED FRONT LENS COMPONENT HAVING A REFRACTIVE POWER OF THE SAME SIGN AS THE INNER MOVABLE COMPONENTS, MECHANICAL MEANS COUPLING THE OUTER MOVABLE COMPONENTS TO EACH OTHER AT A FIXED DISTANCE FROM EACH OTHER, THE FOCAL LENGTH F2, F3 AND F4 OF, RESPECTIVELY, THE FRONT OUTER MOVABLE, THE INNER MOVABLE AND THE REAR OUTER MOVABLE COMPONENTS MEETING THE CONDITIONS THAT:
Claim 4
Dependent Claim
1 words
2$F3$<1/2(T2+T4)<1.8$F3$
References Cited (Backward Citations)
US2741155A
Cited
US2782684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |