Thermal transfer sheet, thermal transfer sheet set, and...

Details Thermal transfer sheet, thermal transfer sheet set, and... Thermal transfer sheet, thermal transfer sheet set, and...

2009-01-27

2011-10-11

Huffman, Julian (Department: 2853)

Incremental printing of symbolic information

Thermal marking apparatus or processes

Multicolor

C347S172000, C347S171000

Reexamination Certificate

active

08035670

ABSTRACT:
A thermal transfer sheet includes coloring material layers D1, D2, and D3. Transferred images respectively formed by the coloring material layers D1, D2, and D3have a value C defined by mathematical formula 1 of less than 12, and colorimetric values P (a*, b*) defined by mathematical formulae 2 and 3 different from one another:in-line-formulae description="In-line Formulae" end="lead"?C=([a*]2+[b*]2)0.5  (mathematical formula 1)in-line-formulae description="In-line Formulae" end="tail"?where C represents chroma and a* and b* each represent a colorimetric value equivalent to L*=38,in-line-formulae description="In-line Formulae" end="lead"?[a*]=(ay−ax)/(Ly−Lx)*(38−Lx)+ax  (mathematical formula 2), andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?[b*]=(by−bx)/(Ly−Lx)*(38−Lx)+bx  (mathematical formula 3)in-line-formulae description="In-line Formulae" end="tail"?where Lx, ax, bx, Ly, ay, and by represent colorimetric values at adjacent step Sx and step Sy near L*=38 when a stairstep image is formed by transfer.

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