公开(公告)号：US06460958B2

公开(公告)日：2002-10-08

申请号：US09793636

申请日：2001-02-27

申请人： Naoki Kubo ,  Jun Koreishi ,  Hideaki Nakanishi ,  Koji Yamamoto

发明人： Naoki Kubo ,  Jun Koreishi ,  Hideaki Nakanishi ,  Koji Yamamoto

IPC分类号： B41J300

CPC分类号： B41J2/01 ,  B41J3/00 ,  B41J3/4073

摘要： Ejection nozzles (152a-152g) are located in a nozzle surface (153) of an ejection head (150). A distance (H: Ha-Hg) between each of the ejection nozzles (152a-152g) and a printing object (109) is obtained and compared with a permissible distance (H0) which is determined by the required level of print quality. The ejection nozzles (152a-152d) whose distances (H) from the printing object (109) are not more than the permissible distance (H0) are enabled for ink ejection, while the ejection nozzles (152e-152g) whose distances (H) are greater than the permissible distance (H0) are disabled for ink ejection. The surface of a printing object (228) is divided into a plurality of target areas (205), each of which is then approximated by a projective plane (206). Then, image data about a projected image (208) which is obtained by orthogonal projection of a print image (207) onto the projective planes (206), is obtained from print image data about an image to be printed on the surface of the printing object (228). According to the projected image data obtained, printing is performed on the target area (205) while moving a ink-jet printhead (210) in parallel with the projective planes (206). This inhibits image degradation during printing on a three-dimensional printing object and also facilitates control of the inclination and position of the ejection head relative to the printing object, thereby permitting high-speed printing.

摘要翻译： 喷射喷嘴（152a-152g）位于喷射头（150）的喷嘴表面（153）中。 获得每个喷嘴（152a-152g）和打印对象（109）之间的距离（H：Ha-Hg），并将其与由所需的打印质量水平确定的允许距离（H0）进行比较。 喷墨嘴（152e-152g）的距离（H）从打印对象（109）不大于允许距离（H0）的喷墨口能够进行喷墨，而距离（H） 大于墨水喷射的允许距离（H0）被禁用。 打印对象（228）的表面被划分成多个目标区域（205），然后每个目标区域由投影平面（206）近似。 然后，通过打印图像（207）的正投影到投影平面（206）上获得的关于投影图像（208）的图像数据从关于待印刷的图像的打印图像数据获得，打印图像数据 物体（228）。 根据获得的投影图像数据，在与投影平面（206）平行移动喷墨打印头（210）的同时，在目标区域（205）上进行打印。 这就抑制了打印在三维打印对象上的图像劣化，并且还有助于控制喷头相对于打印对象的倾斜度和位置，从而允许高速打印。

公开(公告)号：US06360656B1

公开(公告)日：2002-03-26

申请号：US09793761

申请日：2001-02-27

申请人： Naoki Kubo ,  Jun Koreishi ,  Hideaki Nakanishi

发明人： Naoki Kubo ,  Jun Koreishi ,  Hideaki Nakanishi

IPC分类号： B41F1700

摘要： A three-dimensional object printing apparatus according to the present invention comprises: a shape recognition section for obtaining three-dimensional shape data about a surface shape of a three-dimensional object by measurement or the like; an ejection section for ejecting ink toward the three-dimensional object; a scanning section for causing the ejection section to scan relative to the three-dimensional object; and a control section for controlling an operation of the ejection section and/or the scanning section in accordance with information about inclination of the surface of the three-dimensional object, the information being indicated in the data obtained by the shape recognition section. The printing apparatus performs printing in accordance with the information obtained by measurement on the surface inclination of the object to achieve a high-quality printing process. More specifically, a mode of operation is determined for each of a main scanning direction and a sub-scanning direction in accordance with an inclination angle of an inclined surface with respect to each of the main scanning direction and the sub-scanning direction. The printing operation is performed based on the mode of operation.