Optical: systems and elements – Holographic system or element – Authentication
Patent
1996-12-11
1999-12-21
Henry, Jon
Optical: systems and elements
Holographic system or element
Authentication
359572, 359576, 359 33, 430 1, 382210, 235457, 235487, 356 71, 902 25, 283 86, 283109, 283901, 283904, G03H 100, G02B 518, B42D 1510
Patent
active
060056916
ABSTRACT:
The hologram card generates a hologram image in response to an illumination light beam. The hologram card comprises a substrate of a first plastic material having a first refractive index. The substrate has a contoured surface. The contoured surface is formed to include localized topological features constituting a diffractive optical element. The diffractive optical element is structured to generate a hologram image when illuminated by the illumination light beam. The hologram card also comprises a protective layer of a second plastic material having a second refractive index that differs from the first refractive index by less than 0.2. The protective layer covers the contoured surface of the substrate. The protective layer is chemically bonded to, and directly contacts, at least the topological features constituting the diffractive optical element.
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Grot Annette C.
Hoch John S.
Taber Robert C.
Hardcastle Ian
Henry Jon
Hewlett--Packard Company
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