FR1311131A - Improvements to variable focal length lenses - Google Patents
Improvements to variable focal length lensesInfo
- Publication number
- FR1311131A FR1311131A FR857439A FR857439A FR1311131A FR 1311131 A FR1311131 A FR 1311131A FR 857439 A FR857439 A FR 857439A FR 857439 A FR857439 A FR 857439A FR 1311131 A FR1311131 A FR 1311131A
- Authority
- FR
- France
- Prior art keywords
- focal length
- variable focal
- length lenses
- lenses
- variable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Telescopes (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR857439A FR1311131A (en) | 1961-03-31 | 1961-03-31 | Improvements to variable focal length lenses |
GB11421/62A GB945652A (en) | 1961-03-31 | 1962-03-26 | Improvements in or relating to variable focal length or variable magnification lens systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR857439A FR1311131A (en) | 1961-03-31 | 1961-03-31 | Improvements to variable focal length lenses |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1311131A true FR1311131A (en) | 1962-12-07 |
Family
ID=8752140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR857439A Expired FR1311131A (en) | 1961-03-31 | 1961-03-31 | Improvements to variable focal length lenses |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1311131A (en) |
GB (1) | GB945652A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3346320A (en) * | 1963-07-17 | 1967-10-10 | Schneider Co Optische Werke | High-speed varifocal objective |
DE2125352A1 (en) * | 1970-05-21 | 1971-12-02 | Kabushiki Kaisha Ricoh, Tokio | Afocal lens system with continuously variable magnification or focal length |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6032849B2 (en) * | 1977-06-28 | 1985-07-30 | キヤノン株式会社 | telescope lens |
-
1961
- 1961-03-31 FR FR857439A patent/FR1311131A/en not_active Expired
-
1962
- 1962-03-26 GB GB11421/62A patent/GB945652A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3346320A (en) * | 1963-07-17 | 1967-10-10 | Schneider Co Optische Werke | High-speed varifocal objective |
DE2125352A1 (en) * | 1970-05-21 | 1971-12-02 | Kabushiki Kaisha Ricoh, Tokio | Afocal lens system with continuously variable magnification or focal length |
Also Published As
Publication number | Publication date |
---|---|
GB945652A (en) | 1964-01-08 |
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