US3614207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic objective with continuously variable focal length
Assignee: Carl Zeiss AG
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Filing: 1970-05-18
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Granted: 1971-10-19
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Expires: 1990-05-18
Abstract
Abstract A photographic objective of variable focal length consisting of four axially aligned optical members, a first collective member, a second dispersive member, a third dispersive member and a fourth collective member, with an iris diaphragm between the third and fourth member and in which for the purpose of varying the focal length the second and third members are axially adjustable relatively to each other and to the collective member. The second axially adjustable member comprises a single dispersive lens standing along by itself. A predominantly chromatically effective cemented face is provided in the dispersive third member while the dispersive second member comprises a single lens.
Inventors
- 👤 Heinrich Basista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:55
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/144109
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A photographic objective with continuously variable focal length having four axially aligned optical members, a first collective member, a second dispersive member, a third dispersive member and a fourth collective member, in which the change of the focal length is effected by axially displacing the two dispersive members relatively to each other and relatively to said two collective members, wherein the improvement comprises that said second dispersive member consists of a single lens standing by itself, that said third dispersive member contains a predominantly chromatically effective cemented face, that the variable air space (d8) between the third and fourth member in the wide angle positiOn with reference to the other focal length positions is the largest and that the finished data of the objective comply substantially with the data given in the following table.
Claim 2
Dependent Claim
134 words
A photographic objective with continuously variable focal length having four axially aligned optical members, a first collective member, a second dispersive member, a third dispersive member and a fourth collective member, in which the change of the focal length is effected by axially displacing the two dispersive members relatively to each other and relatively to said two collective members, wherein the improvement comprises that said second dispersive member consists of a single lens standing by itself, that said third dispersive member contains a predominantly chromatically effective cemented face, that the variable air space (d8) between the third and fourth member in the wide angle positiOn with reference to the other focal length positions is the largest and that the finished data of the objective comply substantially with the data given in the following table.
Claim 3
Dependent Claim
134 words
A photographic objective with continuously variable focal length having four axially aligned optical members, a first collective member, a second dispersive member, a third dispersive member and a fourth collective member, in which the change of the focal length is effected by axially displacing the two dispersive members relatively to each other and relatively to said two collective members, wherein the improvement comprises that said second dispersive member consists of a single lens standing by itself, that said third dispersive member contains a predominantly chromatically effective cemented face, that the variable air space (d8) between the third and fourth member in the wide angle position with reference to the other focal length positions is the largest and that the finished data of the objective comply substantially with the data given in the following table.
Claim 4
Dependent Claim
134 words
A photographic objective with continuously variable focal length having four axially aligned optical members, a first collective member, a second dispersive member, a third dispersive member and a fourth collective member, in which the change of the focal length is effected by axially displacing the two dispersive members relatively to each other and relatively to said two collective members, wherein the improvement comprises that said second dispersive member consists of a single lens standing by itself, that said third dispersive member contains a predominantly chromatically effective cemented face, that the variable air space (d8) between the third and fourth member in the wide angle position with reference to the other focal length positions is the largest and that the finished data of the objective comply substantially with the data given in the following table.
References Cited (Backward Citations)
US3457003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |