Stereoscopic motion picture large scale scanning reproduction method and apparatus
US4176923A · kind A · utility
Inventor
Key dates
| Filing date | Oct 10, 1978 |
| Grant date | Dec 4, 1979 |
| Priority date | — |
| Expiry date | Oct 10, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/302
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention involves theatre size stereoscopic motion pictures without glasses and without restricted viewing zones and which can be photographed with a standard motion picture camera. Relative lateral motion is required between the camera and the scene. The film is run horizontally through a scan projector in which a given scene on the screen is constructed from several adjacent scenes on the film. The scanned stereoscopic picture can be viewed from different perspectives. A central 3-facet scanning projector of small mass and radius projects over a 120.degree. sector onto triangular elemental mirror scanners causing the node of the image of the projection lens to sweep a large radius about the projector center. From the scanner the sweeping optical axis of the projector passes through the rotation axis where the picture is imaged onto a concentric semi-specular screen. Three vertical concentrically moving aerial viewing slits are generated 120.degree. apart and at one-third screen radius and rotate in the same direction as the scanning projector node image giving a picture repetition rate of 48 Hz. The audience views the stereoscopic picture as constructed of vertical slices of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.