Patent US3851952A successfully refreshed from Google Patents.
US3851952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Macro-zoom lens system
Assignee: Agfa Gevaert AG
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Filing: 1973-05-07
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Granted: 1974-12-03
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Expires: 1993-05-07
Abstract
Abstract A macro-zoom lens system comprising a fixed base objective and an adjustable portion having four optical elements, focusing means for focusing the portion of one of the four optical elements, and focal length adjusting means for adjusting the position of a second and third of the four optical elements relative to each other and to the fourth stationarily arranged optical element.
Inventors
- 👤 S Werz
- 👤 J Zanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:47
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/22; G02B15/144; G04; G04B; G04B19/00; G04B19/24; G04B19/243; G04B19/247; G04B19/25; G04B27/00; G04C; G04C9/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
233 words
A macro-zoom lens system comprising a fixed base objective and an adjustable portion having four optical elements; focusing means for adjusting the position of a first one of said four optical elements; focal length adjusting means for adjusting the position of a second and third of said optical elements relative to each other and to the fourth of said optical elements which is stationarily arranged, said focal length adjusting means comprising two control discs, one constituting a macro-adjusting means engageable with said second and said third optical element for adjusting the position of said second and said third element in fixed relationship to each other relative to said fourth element from a telephoto position to a close-up range position, said discs being turnable about a common axis, one of said discs being provided with a pair of cam tracks for close-up photography and the other with a pair of varifocal cam tracks, shiftable means including link means connecting said discs movable together in the direction of said axis between two end positions, in one of which said second and said third optical element are connected to the cam tracks of one of said discs while in the other of said end positions said second and said third optical element are connected to the cam track of the other of said discs, and means for coupling said discs for simultaneous rotation about said axis.
Claim 2
Dependent Claim
233 words
A macro-zoom lens system comprising a fixed base objective and an adjustable portion having four optical elements; focusing means for adjusting the position of a first one of said four optical elements; focal length adjusting means for adjusting the position of a second and third of said optical elements relative to each other and to the fourth of said optical elements which is stationarily arranged, said focal length adjusting means comprising two control discs, one constituting a macro-adjusting means engageable with said second and said third optical element for adjusting the position of said second and said third element in fixed relationship to each other relative to said fourth element from a telephoto position to a close-up range position, said discs being turnable about a common axis, one of said discs being provided with a pair of cam tracks for close-up photography and the other with a pair of varifocal cam tracks, shiftable means including link means connecting said discs movable together in the direction of said axis between two end positions, in one of which said second and said third optical element are connected to the cam tracks of one of said discs while in the other of said end positions said second and said third optical element are connected to the cam track of the other of said discs, and means for coupling said discs for simultaneous rotation about said axis.
Claim 3
Dependent Claim
90 words
A macro-zoom lens system as defined in claim 1, wherein said focusing means comprise a focusing ring turnable about said axis and shiftable in axial direction between said two end positions, said focusing ring being connected to one of said discs so as to shift and turn the latter and the other disc connected thereto during shifting and turning of said focusing ring, and including means operatively connected to said focusing ring and cooperating with said first optical element for adjusting the position thereof during turning of said focusing ring.
Claim 4
Dependent Claim
37 words
A macro-zoom lens system as defined in claim 1, and including locking means permitting movement of said shiftable means between said two end positions only when said second and said third elements are in said telephoto position.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |