BE402148A - - Google Patents
Info
- Publication number
- BE402148A BE402148A BE402148DA BE402148A BE 402148 A BE402148 A BE 402148A BE 402148D A BE402148D A BE 402148DA BE 402148 A BE402148 A BE 402148A
- Authority
- BE
- Belgium
- Prior art keywords
- systems
- divergent
- focal length
- objectives
- converging
- Prior art date
Links
- 230000004075 alteration Effects 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 206010010071 Coma Diseases 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 description 8
- 201000009310 astigmatism Diseases 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 208000001644 thecoma Diseases 0.000 description 1
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
- G02B15/1435—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 negative
- G02B15/143507—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 negative arranged -++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE402148A true BE402148A (enrdf_load_stackoverflow) |
Family
ID=67961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE402148D BE402148A (enrdf_load_stackoverflow) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE402148A (enrdf_load_stackoverflow) |
-
0
- BE BE402148D patent/BE402148A/fr unknown
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