Projected image alignment method and apparatus
US4997270A · kind A · utility
9Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1989 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Jun 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B35/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Projected image misalignment in a 3-D motion picture projector is corrected by shifting one of the projection lenses in accordance with a predetermined program during presentation of the motion picture. In one embodiment, manually initiated control signals for adjusting the lens shift are recorded in a memory and can be subsequently retrieved for automatically controlling lens shift. In another embodiment, lens shift is controlled by reading predetermined witness marks on the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.