NL253794A - - Google Patents
Info
- Publication number
- NL253794A NL253794A NL253794DA NL253794A NL 253794 A NL253794 A NL 253794A NL 253794D A NL253794D A NL 253794DA NL 253794 A NL253794 A NL 253794A
- 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
- G02B15/142—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 two groups only
- G02B15/1425—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 two groups only the first group being negative
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB24156/59A GB953863A (en) | 1959-07-14 | 1959-07-14 | Improvements in or relating to optical objectives of variable focal length |
| GB1412/60A GB953867A (en) | 1959-07-14 | 1960-01-14 | Improvements in or relating to camera arrangements, for example for television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL253794A true NL253794A (US07351834-20080401-C00087.png) |
Family
ID=33312327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL253794D NL253794A (US07351834-20080401-C00087.png) | 1959-07-14 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3207841A (US07351834-20080401-C00087.png) |
| DE (1) | DE1254456B (US07351834-20080401-C00087.png) |
| GB (1) | GB953867A (US07351834-20080401-C00087.png) |
| NL (1) | NL253794A (US07351834-20080401-C00087.png) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293357A (en) * | 1963-07-30 | 1966-12-20 | Fuji Photo Optical Co Ltd | Internal focusing color television camera |
| US3523719A (en) * | 1968-03-29 | 1970-08-11 | Frank G Back | Macro objective for single lens reflex camera with focal plane shutter |
| 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 |
|---|---|---|---|---|
| US2757232A (en) * | 1952-04-21 | 1956-07-31 | Rca Corp | Light intensity controlling optical system |
| US2854885A (en) * | 1955-02-28 | 1958-10-07 | Camera Vision Productions Inc | Composite electronic and film camera |
| US2854901A (en) * | 1955-04-26 | 1958-10-07 | Thompson Prod Inc | Camera and mirror arrangement |
| GB879527A (en) * | 1956-12-04 | 1961-10-11 | Pye Ltd | Improvements in or relating to television cameras incorporating lenses of variable focal length |
| GB886016A (en) * | 1957-03-22 | 1962-01-03 | Emi Ltd | Improvements relating to colour television cameras |
| US2971051A (en) * | 1958-12-08 | 1961-02-07 | Frank G Back | Varifocal, long back-focal lens for color television |
-
0
- NL NL253794D patent/NL253794A/xx unknown
-
1960
- 1960-01-14 GB GB1412/60A patent/GB953867A/en not_active Expired
- 1960-07-13 DE DER28331A patent/DE1254456B/de active Pending
- 1960-07-14 US US42847A patent/US3207841A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3207841A (en) | 1965-09-21 |
| DE1254456B (de) | 1967-11-16 |
| GB953867A (en) | 1964-04-02 |
