NL232999A - - Google Patents
Info
- Publication number
- NL232999A NL232999A NL232999DA NL232999A NL 232999 A NL232999 A NL 232999A NL 232999D A NL232999D A NL 232999DA NL 232999 A NL232999 A NL 232999A
- Authority
- NL
- Netherlands
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
-
- 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 +-+
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18134/58A GB899635A (en) | 1958-06-06 | 1958-06-06 | Improvements in or relating to control devices for optical objectives of variable focal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL232999A true NL232999A (en) |
Family
ID=10107230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL232999D NL232999A (en) | 1958-06-06 |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH367642A (en) |
| FR (1) | FR1213899A (en) |
| GB (1) | GB899635A (en) |
| NL (1) | NL232999A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1136131B (en) * | 1960-06-18 | 1962-09-06 | Elbe Kamera Gmbh | Lens with variable focal length |
| US4156933A (en) * | 1977-07-28 | 1979-05-29 | Pandres Dave Jr | Ratio preserving control system |
| WO1979000072A1 (en) * | 1977-07-28 | 1979-02-22 | D Pandres | Ratio preserving control system |
| JPS5952402B2 (en) * | 1980-02-18 | 1984-12-19 | 株式会社三協精機製作所 | zoom lens barrel |
| GB2237406B (en) * | 1989-10-27 | 1993-11-03 | Asahi Optical Co Ltd | Zoom lens barrel |
-
0
- NL NL232999D patent/NL232999A/xx unknown
-
1958
- 1958-06-06 GB GB18134/58A patent/GB899635A/en not_active Expired
- 1958-11-03 CH CH6573058A patent/CH367642A/en unknown
- 1958-11-03 FR FR1213899D patent/FR1213899A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1213899A (en) | 1960-04-05 |
| CH367642A (en) | 1963-02-28 |
| GB899635A (en) | 1962-06-27 |