Spatial frequency carrier and process of preparing same
US4017158A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1975 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4294
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A transparency for reproducing preselected area delineations in colors and intensities thereof variable at will is formed by using an interference pattern formed holographically by the interference of a split laser beam. The transparency has a plurality of mutually exclusive areas each individual area representing a variable color wherein the area or areas representing a particular variable color contains spatial frequency carriers which are oriented differently from the spatial frequency carriers of the other areas. The holographic process of preparing the transparency by separately exposing each area in a different orientation to the interference of the two said laser beams is also disclosed. The process and apparatus for utilizing the separation transparency to form predetermined images wherein the color of the individual areas and the intensity thereof forming such image may be varied at will is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.