SPECTRAL REFLECTANCE VARIABLE ALLOY AND RECORDING MATERIAL

PURPOSE:To enable the adaptation to a material capable of recording and erasing information, by preparing an alloy, which takes different spectral reflectances on the basis of the change in a crystal structure due to quenching and heating, by compounding Au and Al being main components in a specific...

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Bibliographische Detailangaben
Hauptverfasser:	MINEMURA TETSUO, WATANABE RIYUUJI, SHIMIZU SEIKI, IKUTA ISAO, ANDOU HISASHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COLOUR PRINTING DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LINING MACHINES METALLURGY PERFORMING OPERATIONS PHYSICS POWDER METALLURGY PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS TYPEWRITERS
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Beschreibung
Zusammenfassung:	PURPOSE:To enable the adaptation to a material capable of recording and erasing information, by preparing an alloy, which takes different spectral reflectances on the basis of the change in a crystal structure due to quenching and heating, by compounding Au and Al being main components in a specific ratio. CONSTITUTION:An Au-Al alloy containing 2.5-4.0wt% of Al is formed into a foil shape. This foil shows a light golden color and changes to a silver white color upon heating and air-cooling. When this silver white foil is scanned by laser beam, a golden color line can be drawn on a silver white substrate. When this golden color part is irradiated with low output laser beam, the light golden color changes to the original silver white color. That is, this alloy has different crystal structures between first temp. higher than room temp. and second temp. lower than room temp. and takes different spectral reflectances. This change in the reflectance can be discriminated in a wavelength region excepting the vicinity of about 550nm. The recording material using this alloy is enabled in the recording and erasion of information and the operation thereof can be performed repeatedly.