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AssigneeSony Corporation
InventorsHisanori Tsuboi, Kenichi Kurihara, Noriyuki Kishii
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A reversible multicolor thermal recording medium capable of recording and erasing repeatedly high-contrast clear images free of color fogging without causing color deterioration and a method for recording on the recording medium. The reversible multicolor recording medium includes recording layers numbered from the first to the nth, which are formed on a supporting substrate separately and independently in sequential order, the recording layers each containing a reversible thermal color developing composition differing from one another in the hue of the developed color and further containing a light-heat converting composition which generates heat upon absorption of near infrared rays with a wavelength in different ranges, and the recording layers having respectively the absorption peak wavelengths λ max 1, λ max 2, . . . , λ max n, in the near infrared region such that 1500 nm>λ max 1>λ max 2> . . . >λ max n>750 nm.
1-22. (canceled)
A reversible multicolor recording medium comprising a plurality of recording layers numbered from a first to a nth layer, which are formed on a supporting substrate side separately and independently in sequential order, said recording layers each containing a reversible thermal color developing composition differing from one another in hue of a developed color and further containing a light-heat converting composition which generates heat upon absorption of near infrared rays with a wavelength in different ranges, and said recording layers having respectively absorption peak wavelengths λ max 1, λ max 2, . . . , λ max n, in a near infrared region such that 1500 nm>λ max 1>λ max 2> . . . >λ max n>750 nm.
A method for recording on a reversible multicolor recording medium, the method comprising irradiation with arbitrary selected laser beams having oscillation center wavelengths (λ1, λ2, . . . , λn) that range from 750 nm to 1500 nm, wherein said reversible multicolor recording medium has recording layers numbered from a first to a nth, which are formed on a supporting substrate side separately and independently in sequential order, wherein said recording layers each contain a reversible thermal color developing composition differing from one another in hue associated with a developed color and further containing a light-heat converting composition which generates heat upon absorption of near infrared rays with a wavelength in different ranges, and wherein said recording layers having respectively an absorption peak wavelengths λ max 1, λ max 2, . . . , λ max n, in an near infrared region such that 1500 nm>λ max 1>λ max 2> . . . >λ max n>750 nm.
Dependencies are inferred from the claim text.