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US 4,233,380 AGranted
Process for shaping a thermoplastic layer
AssigneeHoechst Aktiengesellschaft
InventorsRoland Moraw, Gunther Schadlich
Life of this patent
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Abstract
This invention relates to a process for shaping a recording produced on a material including a photoconductive, thermoplastic layer disposed on a carrier by electrostatic charging and exposure to light, which process comprises disposing the said material on a rigid base, at least one surface region of which is electrically conductive, and heating it.
Claims6
A process for recording a phase hologram in the form of a relief structure of an optical image on a recording material composed of a photoconductive thermoplastic recording layer and an electrically non-conductive transparent flexible base layer comprising
- placing the flexible recording material which is separated by an intermediate layer on a planar, transparent, rigid base on the surface of which latter is disposed an electrically conductive layer, which is grounded,
- electrostatically charging the photoconductive thermoplastic layer, whereby said flexible recording material is firmly and immovably electrostatically attracted onto said rigid base, the electrostatic attraction being effected by said electrostatic charging;
- holographically exposing the charged flexible recording material on the rigid base with interference patterns of light of said optical image;
- and
- softening by heat at least the surface of the charged and exposed flexible recording material on said rigid base by application of a voltage to opposite edges of the electrically conductive layer of said rigid base to thereby deform said photoconductive thermoplastic recording layer to said relief structure.
2 more elements
Dependencies are inferred from the claim text.