申请人:XEROX CORPORATION
公开号:EP0985538A2
公开(公告)日:2000-03-15
A process comprising (a) incorporating into an ink jet printing apparatus (1) a developing composition comprising a liquid vehicle and a color developer; (2) an oxidizing composition comprising a liquid vehicle and an oxidizing agent; (3) a coloring composition comprising a liquid vehicle and a dye coupler; and (4) a fixing composition comprising a liquid vehicle and a fixative; (b) causing droplets of the developing composition to be ejected in an imagewise pattern onto the substrate; (c) causing droplets of the oxidizing composition to be ejected in an imagewise pattern onto the substrate; (d) causing droplets of the coloring composition to be ejected in an imagewise pattern onto the substrate; and (e) causing droplets of the fixing composition to be ejected in an imagewise pattern onto the substrate; wherein the process results in at least some portions of the substrate bearing images comprising all four of the developing composition, the oxidizing composition, the coloring composition, and the fixing composition, said portions forming a printed image. Specific embodiments of the present invention are directed to the realization of continuous tone and gray scale in images by (1) control of the time at which color forming reactions are quenched by controlling the time period between deposition of the color forming liquids and deposition of the fixing liquid; (2) control of the extent of color forming reactions by limitation of the quantity of one of the color forming liquids; or (3) control of pixel size by drop placement control over the overlap areas of drops of color forming liquids.
一种工艺,包括(a)在喷墨打印设备中加入(1)显影组合物,该组合物包括液体载体和显色剂;(2)氧化组合物,该组合物包括液体载体和氧化剂;(3)着色组合物,该组合物包括液体载体和染料耦合剂;以及(4)定影组合物,该组合物包括液体载体和定影剂;(b)使显影组合物的液滴按图像方向喷射到基底上;(c) 使氧化组合物的液滴以图像方向的模式喷射到基底上; (d) 使着色组合物的液滴以图像方向的模式喷射到基底上;以及 (e) 使定影组合物的液滴以图像方向的模式喷射到基底上;其中,该过程的结果是基底的至少某些部分带有包含显影组合物、氧化组合物、着色组合物和定影组合物所有四种组合物的图像,所述部分形成印刷图像。本发明的具体实施方案是通过以下方法实现图像的连续色调和灰度:(1) 通过控制成色液的沉积和定影液的沉积之间的时间段来控制成色反应的淬灭时间;(2) 通过限制其中一种成色液的数量来控制成色反应的程度;或 (3) 通过控制成色液滴的重叠区域来控制像素大小。