Abstract: A manual printing device for printing on a surface of a recording medium when manually scanned in a scanning direction over the recording medium, the manual printing device including: an elongated body to be manually grasped by a user and having an upper tip and a lower tip opposite the upper tip, the lower tip confronting the recording medium when the body is oriented with respect to the recording medium to print on the recording medium; an ink jet print head disposed at the lower tip and capable of printing at a maximum printing width on the surface of the printing medium; a frame disposed at the lower tip and, with respect to the scanning direction, in front of the ink jet print head; a roller rotatably supported on the frame to rotate across the surface of the recording medium when the manual printing device is scanned in the scanning direction over the recording medium; and a protrusion extending from the frame and, when the body is oriented to print on the recording medium, into contact with the recordi

Abstract: A printing sheet is made from a porous resin sheet containing a predetermined amount of carbon grains. In order to manufacture the printing sheet, a mask (which partially shields the infrared rays according to a predetermined pattern) is placed on a transparent plate and the printing sheet is placed on the mask sheet. Flash bulbs irradiate the infrared rays onto the mask sheet. Infrared rays irradiated onto the transparent portion of the mask sheet pass through the mask sheet and reach the printing sheet, causing the carbon grains to heat the resin sheet such that pores in said resin sheet are sealed to form a non-print portion on said porous resin sheet corresponding to said transparent portion.