| 摘要 |
<p>THERMAL TRANSFER PRINTING APPARATUS In a thermal transfer printing apparatus in which a thermal head having a series of selectively energized heating elements arranged substantially along a straight line is pressed against a platen roller with a sheet or ribbon carrying thermally transferable dye material and printing paper interposed therebetween for the selective transfer of the dye material to the printing paper in dependence on the selective energization of the heating elements, the platen roller and thermal head are arranged for shifting relative to each other in the direction of the straight line along which the heating elements are arranged so as to permit improved resolution of the printed image. More particularly, in printing a full color image composed of various different color components including a black component, the platen roller and thermal head are shifted relative to each other, as aforesaid, by one-half the pitch between the heating elements of the thermal head when printing the black component of the printed image so that the black dye material will be transferred to the printing paper at interstices between the transferred dye materials constituting the other color components of the printed image.</p> |
