| 摘要 |
The invention relates to a contact exposure device for a printing screen (202), preferably for use in silk screen printing, offset printing, pad printing, flexographic printing or the like. Said device comprises means for receiving a light-sensitive printing screen (202), means for receiving a film carrying the pattern, and a light source (206), constituted of light-emitting diodes. Said light source (206) emits a substantially linear light and the light source (206) can be displaced along the printing screen (202). The aim of the invention is to provide a contact exposure device which allows sufficient exposure of the light-sensitive emulsion on the printing screen despite the use of low-energy light-emitting diodes (116). The invention is characterized in that a plurality of light fields is configured in the light source (206), every light field having a plurality of light-emitting diodes and the light fields being juxtaposed in a row. Two to six, preferably four, different groups of light-emitting diodes are provided in a light field (110), light-emitting diodes of the same wavelength emitting an approximately monochrome light in every group of light-emitting diodes. |
