| 摘要 |
A method of forming a latent image portion on an overcoat layer by a difference in surface brilliance, at the time of layering an overcoat layer on a thermal transfer subject sheet by a heat transfer method, includes the steps of: setting at least two types of applied energy from the thermal head wherein a plurality of thermal elements are arrayed in line form, and layering the overcoat layer on the thermal transfer subject sheet; forming a difference in surface brilliance made up of a region of relatively high degree of brilliance and a region of relatively low degree of brilliance, based on the difference in the applied energy, to form a line pattern with a plurality of lines; and forming the lines by shifting a phase of a line pattern of the latent image portion and the line pattern of a background portion excluding the latent image portion.
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