Holograms having a standard reference color
First Claim
1. A process for identifying a playback position of a diffracting composition, comprisingproviding a diffracting composition comprising a predetermined image and a reference colour produced by overlapping a first and second zone of spectral dispersion wherein the predetermined image is visible when the reference colour is visible;
- andviewing the diffracting composition from a position at which the reference colour is visible.
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Accused Products
Abstract
Holograms and diffraction gratings are described wherein the presence of a "key-colour" (Magenta) permits an observer to identify the position where all the other colours of the hologram in question can be univocally determined. Two set of spectra are provided such that at a predetermined angle a reference beam of incident white-light illuminating the hologram or diffraction grating composition will cause the observer to see the color "Magenta" which is to be used as a reference "key-colour".
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Citations
32 Claims
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1. A process for identifying a playback position of a diffracting composition, comprising
providing a diffracting composition comprising a predetermined image and a reference colour produced by overlapping a first and second zone of spectral dispersion wherein the predetermined image is visible when the reference colour is visible; - and
viewing the diffracting composition from a position at which the reference colour is visible. - View Dependent Claims (2, 3, 4)
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5. A process for confirming the authenticity of a hologram comprising,
providing a hologram comprising a known predetermined colour or image and a reference colour produced by overlapping a first and second zone of spectral dispersion wherein the predetermined colour or image is visible when the reference colour is visible; -
viewing the hologram from a position in which the reference colour is visible; and verifying that at the position at which the reference colour is visible, a colour or image corresponding to the known predetermined colour or image appears. - View Dependent Claims (6, 7, 8, 9)
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10. A process for confirming the authenticity of an article comprising,
providing an article having affixed thereto a hologram comprising a known predetermined colour or image and a reference colour produced by overlapping a first and second zone of spectral dispersion wherein the predetermined colour or image is visible when the reference colour is visible; -
viewing the hologram from a position at which the reference colour is visible; and verifying that at the position in which said reference colour is visible, a colour or image corresponding to the known predetermined colour or image appears. - View Dependent Claims (11, 12, 13, 14, 15)
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- 16. A hologram comprising a predetermined colour or image and a reference colour, wherein the predetermined colour or image is visible when the reference colour is visible, said reference colour being obtained by overlapping a first and a second zone of spectral dispersion.
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23. A process for identifying a playback position of a hologram, comprising
providing a hologram comprising a predetermined image and a reference colour produced by overlapping a first and second zone of spectral dispersion wherein the predetermined image is visible when the reference colour is visible; - and
viewing the hologram from a position at which the reference colour is visible. - View Dependent Claims (24, 25)
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- 26. A diffracting composition comprising a predetermined colour or image and a reference colour, wherein the predetermined colour or image is visible when the reference colour is visible, said reference colour being obtained by overlapping a first and a second zone of spectral dispersion.
Specification