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US 5,688,737 AGranted
Thermal transfer recording medium
AssigneeSony Corporation
InventorsTetsuya Abe, Toshio Fukuda, Yoshio Fujiwara
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AssigneeSony Corporation
InventorsTetsuya Abe, Toshio Fukuda, Yoshio Fujiwara
Estimating the term…
A thermal transfer recording medium comprises a substrate and an ink layer formed on the substrate. The ink layer comprises a first dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 420 to 500 nm and a half-value width of at least 100 nm, and a second dye having a light absorption peak which which has a maximum absorption wavelength, .lambda..sub.max, of 570 to 650 nm and a half-value width of at least 100 nm. The ink layer may further comprise a third dye having a light absorption peak whose maximum absorption wavelength, .lambda..sub.max, of 500 to 550 nm and/or a fourth dye having a light absorption peak whose maximum absorption wavelength, .lambda..sub.max, of 620 to 680 nm. When a density-graded indication is made using the thermal transfer recording medium, there can be obtained images whose black hue shift is small in all the density range.
A thermal transfer recording medium which comprises a substrate and an ink layer formed on the substrate, the ink layer comprising a first dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 420 to 500 nm and a half-value width of at least 100 nm and a second dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 570 to 650 nm and a half-value width of at least 100 nm and wherein a black color image produced from the medium has a substantially constant hue in a density-graded indication.
A thermal transfer recording medium which comprises a substrate and an ink layer formed on the substrate, the ink layer comprising a first dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 420 to 500 nm and a half-value width of at least 100 nm, a second dye having a light absorption peak which which has a maximum absorption wavelength, .lambda..sub.max, of 570 to 650 nm and a half-value width of at least 100 nm, and at least one member selected from a third dye having a light absorption peak whose maximum absorption wavelength, .lambda..sub.max, ranges 500 to 550 nm and a fourth dye having a light absorption peak whose maximum absorption wavelength, .lambda..sub.max, ranges 620 to 680 nm.
A thermal transfer recording medium which comprises a substrate and an ink layer formed on the substrate, the ink layer comprising:
A thermal transfer recording medium which comprises a substrate and an ink layer formed on the substrate, the ink layer comprising a first dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 420 to 500 nm and a half-value width of at least 100 nm and a second dye having a light absorption peak which has a maximum absorption wavelength, .lambda..sub.max, of 570 to 650 nm and a half-value width of at least 100 nm and wherein a black density-graded image produced by the medium has a substantially constant hue with -10.ltoreq.a*.ltoreq.10 and -5.ltoreq.b*.ltoreq.5, according to the CIE (1976) L*a*b* Colorimetric system.
Dependencies are inferred from the claim text.