| 摘要 |
A method for preparing a color laser marked article using three infrared lasers L-1, L-2 and L-3 having respectively a laser emission wavelength of »(L-1), »(L-2) and »(L-3) and comprising the steps of:
- laser marking with the infrared laser L-1 a first color laser markable layer including an infrared dye IR-1 having an absorption maximum in the infrared region » max (IR-1);
- laser marking with the infrared laser L-2 a second color laser markable layer including an infrared dye IR-2 having an absorption maximum in the infrared region » max (IR-2);
- laser marking with the infrared laser L-3 a third color laser markable layer including an infrared dye IR-3 having an absorption maximum in the infrared region » max (IR-3); and
- at least partially exposing the color laser markable article to light having a wavelength between 520 nm and 700 nm,
wherein, the laser emission wavelengths satisfy the condition of:
the infrared dye absorption maxima satisfy the condition of:
and
the light emitted by the infrared laser L-1 passes, in order, through the third and second color laser markable layer before exposing the first color laser markable layer. |
