Method for preparing relief image printing plates
US5147761A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/2002
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method is provided for producing relief images having improved image fidelity and resolution. The method comprises positioning an image bearing negative transparency closely adjacent and substantially parallel to a layer of a photocurable material; positioning on the other side of the negative from the photocurable material and in substantially parallel relationship thereto at least one louver having a plurality of open cells, each cell extending through the louver along an axis perpendicular to the negative and having reflective side surfaces contoured to reflect and redirect rays of radiant energy incident thereon to a direction more normal to the negative surface; and passing radiant energy which is capable of curing the photocurable material through the louver and the negative and onto and through the photocurable material for a time sufficient to form a latent relief image in the photocurable material. The present invention is further directed to an apparatus for producing a latent relief image using the above method. The apparatus comprises, in sequence, a planar support for the photocurable layer, a negative in substantially parallel relation to the support, at least one l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.