Method and apparatus for preparing relief image printing plates

Details Method and apparatus for preparing relief image printing plates Method and apparatus for preparing relief image printing plates

G - Physics

03

F

G03F 7/30 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2044024

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 louver which is positioned parallel in its major plane to the negative, and, immediately adjacent to the louver, a radiation source for irradiating the photocurable layer through the louver and the negative and effecting curing thereof. The method and apparatus of the invention are especially useful for the production of improved high resolution half-tone and line relief images.

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