GB825684A - Optical projection apparatus - Google Patents
Optical projection apparatusInfo
- Publication number
- GB825684A GB825684A GB22674/57A GB2267457A GB825684A GB 825684 A GB825684 A GB 825684A GB 22674/57 A GB22674/57 A GB 22674/57A GB 2267457 A GB2267457 A GB 2267457A GB 825684 A GB825684 A GB 825684A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- apertures
- july
- light
- pattern
- Prior art date
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
825,684. Optical-projection systems. ASKANIA-WERKE A. G. July 17, 1957 [July 26, 1956], No. 22674/57. Class 97(1) A system for projecting a pattern of reference lines including one or more circles, comprises a diaphragm having a corresponding pattern of light transmitting apertures smaller in area than the. opaque portions, an optical element having toroidal zones to focus light in the vicinity of the apertures and a lens to project an image of the diaphragm. In the form shown the diaphragm 4 has a central aperture 4<SP>1</SP> with concentric circular slits 4<SP>11</SP>, 4<SP>111</SP> and the condenser system comprises a member 3 having a spherical portion 3<SP>1</SP> with concentric toric portions 3<SP>11</SP>, 3<SP>111</SP>, for concentrating light from the source 1 into these apertures. The member 3 may be replaced by an opaque plate having apertures in a configuration corresponding to those in the diaphragm 4, each aperture having a reflecting, part-paraboloidal crosssection.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE825684X | 1956-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB825684A true GB825684A (en) | 1959-12-16 |
Family
ID=6747595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22674/57A Expired GB825684A (en) | 1956-07-26 | 1957-07-17 | Optical projection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB825684A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2179484A (en) * | 1985-07-18 | 1987-03-04 | Asahi Optical Co Ltd | Projection type liquid-crystal video display device using a fresnel lens |
| DE4138020A1 (en) * | 1991-11-19 | 1992-04-16 | Burkhard Dr Neumann | Microscope system for increasing light transmission through grid - has lens raster projecting congruent light source raster in intermediate image raster to improve contrast |
-
1957
- 1957-07-17 GB GB22674/57A patent/GB825684A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2179484A (en) * | 1985-07-18 | 1987-03-04 | Asahi Optical Co Ltd | Projection type liquid-crystal video display device using a fresnel lens |
| GB2179484B (en) * | 1985-07-18 | 1990-03-28 | Asahi Optical Co Ltd | Projection type liquid-crystal video display device using a fresnel lens |
| DE4138020A1 (en) * | 1991-11-19 | 1992-04-16 | Burkhard Dr Neumann | Microscope system for increasing light transmission through grid - has lens raster projecting congruent light source raster in intermediate image raster to improve contrast |
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