Thermal transfer color-variable ribbons for peripheral printers
US6143398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jul 15, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A thermal transfer color-variable ribbon is disclosed, the color appearance of which depends on the variation of viewing angle, which includes a substrate, a releasing agent formed on the substrate, a functional coating, which can be a multilayer thin-film stack of reflection mode or transmission mode, formed on the releasing agent, and an adhering layer formed on the functional coating. The functional coating is designed based on the general theory that describes the thin-film interference phenomena. The functional coating can be formed by alternately stacking dielectrics having high and low refractive indices or dielectric and metal layers. The construction parameters of the all-dielectric stack and the metal/dielectric stack can be chosen in similar way to how parameters are chosen when manufacturing selective band-pass filters, which are designed based on the thin-film interference theory. The color appearance of the printed document, either in reflection mode or in transmission mode, can be selected and optimized as for the filter design. The effect of varying incident angle on color appearance of the functional coating in either mode can also be optimized during the design. F…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.