| 摘要 |
<p>PURPOSE:To effect printing at a high speed without a high-speed driving of an image-formation lens by a method wherein an image-formation plate is made into the form of a curved surface conforming with the side face of a circular cylinder produced with its center at the axis extending through the scan center of a scan laser beam and intersecting perpendicularly the optical path of the scan laser beam. CONSTITUTION:Although a laser beam is imaged by an image-formation lens 5 focused on an ink ribon 13 on an image-formation plate 10, it is necessary for the image-formation plate 10 to be made into the form of a curved surface extending along the side face of a circular cylinder produced with its center at the rotating axis O of a galvanomirror 6. For this reason, once the image- formation lens 5 has been focused, the laser beam is always in focus on the ink ribbon 13 on the image-formation plate 10. Therefore, since the image- formation plate 10 is made into the form of the curved surface extending along the side face of the circular cylinder produced with its center at the rotating axis 0 of the mirror 6, an accurate printing is possible, there is no need for a driving device to keep the image-formation lens 5 always in focus as in the conventional way and a high-speed printing can be easily effected.</p> |
