FR2469728B3 - - Google Patents
Info
- Publication number
- FR2469728B3 FR2469728B3 FR7927661A FR7927661A FR2469728B3 FR 2469728 B3 FR2469728 B3 FR 2469728B3 FR 7927661 A FR7927661 A FR 7927661A FR 7927661 A FR7927661 A FR 7927661A FR 2469728 B3 FR2469728 B3 FR 2469728B3
- Authority
- FR
- France
- 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
- G02B15/143—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)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7927661A FR2469728A3 (fr) | 1979-11-09 | 1979-11-09 | Objectif de projection a distance focale reglable par echelons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7927661A FR2469728A3 (fr) | 1979-11-09 | 1979-11-09 | Objectif de projection a distance focale reglable par echelons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2469728A3 FR2469728A3 (fr) | 1981-05-22 |
| FR2469728B3 true FR2469728B3 (enExample) | 1981-10-16 |
Family
ID=9231488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7927661A Granted FR2469728A3 (fr) | 1979-11-09 | 1979-11-09 | Objectif de projection a distance focale reglable par echelons |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2469728A3 (enExample) |
-
1979
- 1979-11-09 FR FR7927661A patent/FR2469728A3/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2469728A3 (fr) | 1981-05-22 |