OPTICAL ELEMENT AND CARD

PROBLEM TO BE SOLVED: To prevent spark generation, prevent a fire and damage of a machine in manufacturing, and improve the visibility of a hologram in the hologram having a light reflecting layer comprising a metal deposited thin film or a card such as a magnetic card including the hologram on a ma...

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Bibliographische Detailangaben
Hauptverfasser:	SHINDO NAOAKI, NAKASHIBA MICHIYA
Format:	Patent
Sprache:	eng
Schlagworte:	BOOK COVERS BOOKBINDING DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR FILES LOOSE LEAVES MOVABLE-STRIP WRITING OR READING APPARATUS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PERFORMING OPERATIONS PHYSICS PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR SPECIAL PRINTED MATTER TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent spark generation, prevent a fire and damage of a machine in manufacturing, and improve the visibility of a hologram in the hologram having a light reflecting layer comprising a metal deposited thin film or a card such as a magnetic card including the hologram on a magnetic layer.SOLUTION: This optical element comprises a hologram layer 3 including a hologram forming layer 4 and a reflecting layer 5. The hologram forming layer includes a diffraction structure formed of microscopic asperities. The reflecting layer includes: a first reflecting layer 6 having a sea-island structure in which an island part comprises a metal material with an average diameter of 80-120 μm, and an interval between the island parts is 30-60 μm; and a second reflecting layer 7 covering the first reflecting layer and having the sea-island structure in which the island part comprises a metal material with an average diameter of 0.02-1 μm and an interval between the island parts is 0.01-0.5 μm.