Motion picture optical system
US4152052A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1976 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Dec 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B41/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system for the intermittent immobilization of motion picture images on a continuously moving film strip passing through a film gate. The image path of the system includes a ring-shaped optical element rotatably driven about its central axis. Rotation of this "optical cam" is synchronized with the continuous feed motion of the film strip through the film gate so as to cause the image to be immobilized for the period of the cam's rotation, after which the cycle is repeated. Three fixed optical elements comprising a film gate corrector, an aperture corrector, and a focal plane corrector are interposed in the image path for compensation of optical aberrations caused by the variation of optical cam scan angle and tangential slope over the intercepted area of the optical aperture, and by the compound "Euler" angle changes with optical cam rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.