JPS641987A - Projection type display apparatus for ppi radar image - Google Patents
Projection type display apparatus for ppi radar imageInfo
- Publication number
- JPS641987A JPS641987A JP15530987A JP15530987A JPS641987A JP S641987 A JPS641987 A JP S641987A JP 15530987 A JP15530987 A JP 15530987A JP 15530987 A JP15530987 A JP 15530987A JP S641987 A JPS641987 A JP S641987A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- ppi radar
- mirror scanner
- radar image
- scanner
- 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.)
- Pending
Links
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
PURPOSE: To prevent two projected images from being superposed on each other near the center point of a screen and obtain a clear rotary projected image by providing a second optical system constituted by a variable curvature conical lens between a polygonal mirror scanner and a dub prism.
CONSTITUTION: A second optical system 31 constituted by a variable curvature conical lens is provided between a polygonal mirror scanner 2 and a dub prism 3. Light from a laser light source 7 is intensity-modulated by a video signal determined by the intensity of the received echo of a PPI radar instrument in an AOM 8 and falls upon the mirror scanner 2. The incident light is reflected from the scanner 2 and deflected in a direction R. When a reflected beam falls upon the second optical system 31, an incident point is different depending on the distance of a PPI radar image. As a result, the width of the light beam is narrow when the distance is small and wide when large. Accordingly, two projected images with an address (n) in a direction θ and with the subsequent address n+1 are not unnecessarily superposed on each other near a center point.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15530987A JPS641987A (en) | 1987-06-24 | 1987-06-24 | Projection type display apparatus for ppi radar image |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15530987A JPS641987A (en) | 1987-06-24 | 1987-06-24 | Projection type display apparatus for ppi radar image |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH011987A JPH011987A (en) | 1989-01-06 |
JPS641987A true JPS641987A (en) | 1989-01-06 |
Family
ID=15603075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15530987A Pending JPS641987A (en) | 1987-06-24 | 1987-06-24 | Projection type display apparatus for ppi radar image |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS641987A (en) |
-
1987
- 1987-06-24 JP JP15530987A patent/JPS641987A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2096120A1 (en) | Scene Projector | |
CA2247884A1 (en) | Image display apparatus | |
CA2309930A1 (en) | De-centered lens group for use in an off-axis projector | |
DE69428716D1 (en) | PROJECTION SYSTEM FOR MOVING IMAGES | |
US3576945A (en) | Apparatus for optically insetting one image into another image | |
US5146365A (en) | Screen and image display apparatus which minimizes the effects of re-reflected incident light | |
JPS56164312A (en) | Optical deflecting device | |
GB1328128A (en) | Optical mechanical raster scanning apparatus | |
GB1324323A (en) | Automatic focusing of an optical image | |
US3656828A (en) | Light signal apparatus | |
US3495036A (en) | Line-illuminating apparatus and method for television | |
GB1350013A (en) | Automatic focussing apparatus for use in oculometers | |
EP0374793A3 (en) | Display apparatus | |
GB1179273A (en) | Apparatus for Receiving a Multicolour Television Picture. | |
US4200786A (en) | Electrooptical focusing apparatus for photographic cameras | |
US5997143A (en) | Optical projection devices including a lens plate integrator | |
JPS641987A (en) | Projection type display apparatus for ppi radar image | |
GB1477625A (en) | Focussing of optical systems | |
GB1290937A (en) | ||
US4171896A (en) | Photographic camera with an information indicating finder | |
GB1507626A (en) | Telecine equipment comprising an arrangement for projecting images of markers on to a photosensitive surface | |
TW377400B (en) | Active video apparatus using deflection lenses | |
JPS57128325A (en) | Optical finder for video camera | |
JPS55113015A (en) | Radiating device | |
JPS5629223A (en) | Projector |