Photographic copier
US6341008B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1999 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Aug 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a photographic copier apparatus for projecting a photographic original onto a light sensitive copy material. The photographic copier has the following: (a) a light source for emitting light for the projection, (b) a number of optical, light guiding elements for guiding the light along a light path from the light source to the copy material as well as for the projecting of the original onto the light sensitive copy material, and (c) a liquid crystal matrix through which the light is guided by way of the light guiding elements, before it exposes the copy material. According to the present invention, the liquid crystal matrix has a plurality of elements, the transmission of which can be individually changed. The change in transmission of each element of the liquid crystal matrix is achieved by scattering of the light passing through the element, whereby the degree of the scattering is controllable by application of a voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.