NL259582A - - Google Patents
Info
- Publication number
- NL259582A NL259582A NL259582DA NL259582A NL 259582 A NL259582 A NL 259582A NL 259582D A NL259582D A NL 259582DA NL 259582 A NL259582 A NL 259582A
- Authority
- NL
- Netherlands
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- 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
- G02B15/143—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 three groups only
- G02B15/1431—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 three groups only the first group being positive
- G02B15/143105—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 three groups only the first group being positive arranged +-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB61/60A GB953866A (en) | 1960-01-01 | 1960-01-01 | Improvements in or relating to optical systems of variable equivalent focal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL259582A true NL259582A (fr) |
Family
ID=9697707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL259582D NL259582A (fr) | 1960-01-01 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3164664A (fr) |
| CH (1) | CH383029A (fr) |
| DE (1) | DE1301590B (fr) |
| GB (1) | GB953866A (fr) |
| NL (1) | NL259582A (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3961845A (en) * | 1973-08-17 | 1976-06-08 | Fuji Photo Optical Co., Ltd. | Zoom lens system |
| JP4305503B2 (ja) * | 2006-12-01 | 2009-07-29 | カシオ計算機株式会社 | レンズ系及びそれを用いたプロジェクタ装置 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2324057A (en) * | 1941-09-03 | 1943-07-13 | Eastman Kodak Co | Lens attachment |
| US2507164A (en) * | 1948-12-17 | 1950-05-09 | Eastman Kodak Co | Reverse telephoto lens for enlargers |
| US2582085A (en) * | 1950-09-01 | 1952-01-08 | Eastman Kodak Co | Wide-angle lens attachment with front element of high index glass |
| US2821110A (en) * | 1953-06-10 | 1958-01-28 | Taylor Taylor & Hobson Ltd | Anamorphotic attachments for optical objectives |
| US2752821A (en) * | 1954-02-05 | 1956-07-03 | Taylor Taylor & Hobson Ltd | Wide angle anamorphotic attachments for optical objectives |
| US2913957A (en) * | 1958-06-27 | 1959-11-24 | Frank G Back | Varifocal lens assembly |
-
0
- NL NL259582D patent/NL259582A/xx unknown
-
1960
- 1960-01-01 GB GB61/60A patent/GB953866A/en not_active Expired
- 1960-12-27 US US78744A patent/US3164664A/en not_active Expired - Lifetime
- 1960-12-29 CH CH1455960A patent/CH383029A/fr unknown
- 1960-12-30 DE DER29377A patent/DE1301590B/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1301590B (de) | 1969-08-21 |
| GB953866A (en) | 1964-04-02 |
| US3164664A (en) | 1965-01-05 |
| CH383029A (fr) | 1964-10-15 |