| 摘要 |
PURPOSE:To enable an enlarged image having an efficient picture quality to be quickly displayed on a surface of a blackboard, by arranging a non-impact type recording head like an ink jet opposite to a surface of a writing medium as an enlarging display means. CONSTITUTION:An ink jet 28 is so constructed that ink is jetted to a surface of a writing medium 5 from a nozzle 32 by generating high pressure wave by impressing pulse voltage to an electrostrictive element 31 in contact with an outer periphery of a glass cylinder 30 in which an ink chamber 29 is provided. In the case where it is desirous to display materials or the like on hand by enlargement on the writing medium 5, when they are inserted into an image scanner 4 from a charge opening 7, images of character, graphic, etc. on the faces of materials are read with a second read element in the image scanner 4, sent to the ink jet 28, and enlarged to be recorded on the writing medium 5 via ink to be jetted from respective nozzles 32, 32.... Then, this enlarged recorded image appears on the surface of the blackboard due to sending the writing medium 5 by driving a motor 18. |
