NL238193A - - Google Patents
Info
- Publication number
- NL238193A NL238193A NL238193DA NL238193A NL 238193 A NL238193 A NL 238193A NL 238193D A NL238193D A NL 238193DA NL 238193 A NL238193 A NL 238193A
- Authority
- NL
- Netherlands
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
- G02B15/1445—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 negative
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH6614758 | 1958-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL238193A true NL238193A (xx) |
Family
ID=4526924
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL238193D NL238193A (xx) | 1958-11-13 | ||
| NL112929D NL112929C (xx) | 1958-11-13 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL112929D NL112929C (xx) | 1958-11-13 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3034404A (xx) |
| CH (1) | CH347650A (xx) |
| DE (1) | DE1152833B (xx) |
| GB (1) | GB915221A (xx) |
| NL (2) | NL112929C (xx) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1537687A (fr) * | 1967-01-30 | 1968-09-07 | Commissariat Energie Atomique | Perfectionnements aux objectifs de reproduction |
| JP2780309B2 (ja) * | 1989-02-28 | 1998-07-30 | ミノルタ株式会社 | コンパクトなズームレンズ系 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1947669A (en) * | 1931-09-28 | 1934-02-20 | Bell & Howell Co | Lens of variable equivalent focal length |
| GB440397A (en) * | 1934-03-26 | 1935-12-30 | Henri Chretien | Improvements in optical systems |
| US2159394A (en) * | 1936-06-09 | 1939-05-23 | Paramount Productions Inc | Variable equivalent focal length lens |
| FR1120271A (fr) * | 1955-01-24 | 1956-07-03 | Objectif à longueur focale variable |
-
0
- NL NL238193D patent/NL238193A/xx unknown
- NL NL112929D patent/NL112929C/xx active
-
1958
- 1958-11-13 CH CH347650D patent/CH347650A/fr unknown
-
1959
- 1959-04-10 DE DEP22567A patent/DE1152833B/de active Pending
- 1959-05-19 US US814262A patent/US3034404A/en not_active Expired - Lifetime
- 1959-05-20 GB GB17085/59A patent/GB915221A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB915221A (en) | 1963-01-09 |
| NL112929C (xx) | |
| US3034404A (en) | 1962-05-15 |
| CH347650A (fr) | 1960-07-15 |
| DE1152833B (de) | 1963-08-14 |