FR838806A - - Google Patents
Info
- Publication number
- FR838806A FR838806A FR838806DA FR838806A FR 838806 A FR838806 A FR 838806A FR 838806D A FR838806D A FR 838806DA FR 838806 A FR838806 A FR 838806A
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0988—Diaphragms, spatial filters, masks for removing or filtering a part of the beam
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/005—Diaphragms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR838806A true FR838806A (sh) | 1939-03-16 |
Family
ID=1554127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR838806D Expired FR838806A (sh) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR838806A (sh) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2639513A (en) * | 1950-02-21 | 1953-05-26 | Sr Willard C Ricord | Means for optically aligning motion-picture projectors |
| DE1131906B (de) * | 1959-10-30 | 1962-06-20 | Pierre Cibie | Anwendung eines Blendensystems aus einer Mehrzahl von untereinander parallelen, duennen undurchsichtigen Lamellen fuer eine optische Visiereinrichtung |
-
0
- FR FR838806D patent/FR838806A/fr not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2639513A (en) * | 1950-02-21 | 1953-05-26 | Sr Willard C Ricord | Means for optically aligning motion-picture projectors |
| DE1131906B (de) * | 1959-10-30 | 1962-06-20 | Pierre Cibie | Anwendung eines Blendensystems aus einer Mehrzahl von untereinander parallelen, duennen undurchsichtigen Lamellen fuer eine optische Visiereinrichtung |