公开(公告)号：JPS59201863A

公开(公告)日：1984-11-15

申请号：JP7585883

申请日：1983-04-28

Applicant: Canon Inc

Inventor： SAKURADA NOBUAKI ,  KAWAMURA HIDEAKI ,  SASAKI TAKU

IPC: B41J2/52 ,  B41J2/205 ,  B41J2/21 ,  B41M5/00 ,  G03F5/00 ,  H04N1/40 ,  H04N1/405 ,  H04N1/50 ,  H04N1/52

CPC classification number: H04N1/40087 ,  H04N1/502 ,  H04N1/52

Abstract: PURPOSE:To obtain more gradations by selecting a method of enabling a greater number of cells for forming dots when there are two or more kinds of methods of controlling the number of cells for reproducing virtually the same concentration. CONSTITUTION:A head unit 51 has ink jet nozzles 52 in two kinds of density, dark and light, each for black, yellow, magenta and cyan to compose one 3X3 matrix pixel to make the reflectively optical density equal between when four light does are formed for each pixel and when one dense dot is formed for each pixel. Here, for example, the gradation 4 can be expressed by four light dots or one dense dot. But in this manner, when there are more than one methods of controlling the number of cells for reducing virtually the same density, the one of enabling more cells for forming dots, namely, four light dots is selected to drive a printing head. This enables the reproduction of more gradations without increasing the number of cells while eliminating rough looking thereby producing an image of a high quality.

Abstract translation: 目的：通过选择当有两种或多种控制用于再现几乎相同浓度的细胞数量的方法时，能够使更多数量的细胞形成点的方法来获得更多的等级。 构成：头单元51具有两种密度，深和浅两种类型的喷墨嘴52，分别用于黑色，黄色，品红色和青色，以形成一个3×3矩阵像素，以在四个光形成之间使反射光密度相等 对于每个像素，并且当为每个像素形成一个密点时。 这里，例如，灰度4可以由四个点或一个密点表示。 但是以这种方式，当存在控制用于减少几乎相同密度的单元数量的多种方法时，选择使更多的用于形成点的单元（即，四个点）来驱动打印头。 这使得能够在不增加细胞数的同时再现更多的灰度，同时消除粗糙的图像，从而产生高质量的图像。