Color laser marking
US9604490B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2013 |
| Grant date | Mar 28, 2017 |
| Priority date | — |
| Expiry date | Oct 10, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24835
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
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 λ(L-1), λ(L-2) and λ(L-3) includes 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 λmax(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 λmax(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 λmax(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: λ(L-1)>λ(L-2)>λ(L-3); the infrared red dye absorption maxima satisfy the condition of: λmax(IR-1)>λmax(IR-2)>λmax(IR-3); 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.