| 摘要 |
PURPOSE: To locally remove a first color layer by providing at least second color layer at least partly thermally decomposable by an influence of a laser beam light under the first layer for transmitting the beam. CONSTITUTION: A recording with a laser beam light is conducted perpendicularly on a flat surface of an ID card at a position 4. An energy of the light 1 is substantially not absorbed by a material of a first color layer 3 in an area 5. However, part of the light L is absorbed by a pigment contained in a second color layer 2. As a result, the material of the layer 2 is decomposed (evaporated, sublimated or the like) in an area 6. The layer 3 disposed thereon is blown out by a pressure generated as the result, but the blown area is limited to a relatively narrow place 4 to which the light L is emitted. Recording parameters such as a thickness, decomposing characteristics, laser beam light intensity and the like of the layer 2 are partly removed in the color layer, and regulated to one another so as to be observed with eyes comparatively to the first layer. |
