Thermal printer
Thermal printers are used increasingly in retail, warehouse, and other locations to generate adhesive labels for marking goods to facilitate identification, tracking, and pricing. Thermal imaging or thermography is a recording process wherein images are generated by the use of imagewise modulated thermal energy. A thermal printer record images on a recording paper by using a thermal head having a line of a plurality of heating elements (resistors). Thermal printers may be classified into thermal transfer printers and thermosensitive type printers (direct thermal printer). A thermal transfer printer transfers the ink of the ink ribbon to the recording paper by putting the ink ribbon on the recording paper and heating the rear face of the ink ribbon by means of the heating elements. The thermosensitive type printers heat a thermosensitive recording medium directly to record an image thereon. A color thermal printer is used with color thermosensitive recording paper, and produces full-color prints. Such a color thermal printer uses a color thermosensitive recording paper in which at least three kinds of thermosensitive coloring layers are stacked on a base in order. The color thermal recording paper includes yellow, magenta, and cyan thermosensitive coloring layers overlaid on a support in sequence. These three coloring layers have different thermosensitivities such that the coloring of them may be selectively made. The respective coloring layers are stacked in an order of yellow, magenta and cyan from the uppermost layer. A thermal head is incorporated in the thermal printer, is constituted by a heating element array of numerous heating elements arranged in a main scan direction. The thermal head pressurizes the recording material, and applies heat to the same, to develop color at a desired density. In order to obtain a high quality image, the temperature of the thermal head needs to be kept appropriately.
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