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US 2006/0269878 A1Published application
Protection of transient documents using a photochromic protective layer
AssigneeXerox Corporation
InventorsNaveen Chopra, Hadi Mahabadi, Peter Kazmaier, Gabriel Iftime
Life of this patent
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Abstract
A protective, switchable layer adapted for use in transient imageable documents is disclosed. The protective layer can be disposed on an underlying photochromic layer and enables writing or imaging the underlying layer. The protective layer prevents unintentional writing on the photochromic layer, such as can otherwise occur from exposure to certain wavelengths of light.
Claims20
A selectively imageable and protected member having an imaging state and a reading state, the member comprising:
- a display layer, the display layer imageable upon exposure to light of a first wavelength and comprising a photochromic display material;
- a protective layer disposed on the display layer, the protective layer being (i) at least substantially transparent to and non-absorbing of light of the first wavelength when the member is in the imaging state, and (ii) substantially non-transparent to and absorbing of light of the first wavelength when the member is in the reading state.
A protected imageable member comprising:
- a display layer imageable upon exposure to light of a first wavelength and comprising a photochromic display material;
- and
- a protective layer disposed on the display layer, the protective layer transforming from a first state in which the protective layer is substantially non-transparent to and absorbing of light of the first wavelength to a second state in which the protective layer is substantially transparent to and non-absorbing of light of the first wavelength upon exposure to light of the first wavelength, and after a period of time, reverting to the first state.
A protected imageable member comprising:
- a display layer imageable upon exposure to light of a first wavelength and comprising a photochromic display material;
- and
- a protective layer disposed on the display layer, the protective layer comprising at least one agent selected from the group consisting of chromenes (napthopyrans), diaryperfluorocyclopentenes, azobenzene derivatives, and combinations thereof.
Dependencies are inferred from the claim text.