Method for replicating holographic optical elements
AssigneeE. I. Du Pont de Nemours and Company
InventorFelix P. Shvartsman
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Abstract
A method for making an optical image element having a high aspect ratio relief hologram comprising the sequential steps of (a) applying a dry photohardenable film to a surface of a transparent dimensionally stable substrate; (b) embossing the exposed surface of the photohardenable film with the holographic image by applying thereto under pressure a stamper containing a reverse relief image of the hologram having an aspect ratio of at least 3:1; (c) passing actinic radiation through the transparent substrate and the photohardenable film to effect hardening of the photohardenable film while it is in contact with the stamper; and (d) separating the stamper die from the embossed photohardened film.
Claims17
A method for replicating an optical element having a surface relief hologram comprising the sequential steps of:
- (a) laminating a dry photohardenable film to a surface of a dimensionally stable optically transparent substrate, the film capable of being embossed at room temperature to form a relief holographic image having an aspect ratio of at least 10:1;
- (b) embossing a relief holographic image in the photohardenable film at room temperature by applying thereto under pressure a stamper containing a reverse relief image of the hologram having an aspect ratio of at least 10:1;
- (c) passing actinic radiation through the transparent substrate and the unheated photohardenable film to effect hardening of the photohardenable film while maintaining embedded contact between the stamper and the photohardenable film;
- and
- (d) separating the stamper from the photohardened film containing the surface relief hologram having an aspect ratio of at least 10:1.
A method for replicating an optical element having a surface relief hologram, comprising:
- (a) embossing a relief holographic image having an aspect ratio of at least 10:1 in a dry photohardenable film at room temperature by applying thereto under pressure a stamper containing a reverse relief image of the relief image having an aspect ratio of at least 10:1, wherein the dry photohardenable film is supported by a dimensionally stable, optically transparent substrate;
- (b) passing actinic radiation through the transparent substrate and the embossed dry photohardenable film while maintaining embedded contacted between the stamper and the photohardenable film;
- and
- (c) separating the stamper from the film containing the surface relief hologram having the aspect ratio of at least 10:1,
- wherein the dry photohardenable film consists essentially of an admixture of 5-50% liquid ethylenically unsaturated monomer or monomers, 0.1-10% initiator system, 25-75% solid polymeric binder or binders, 0-25% plasticizer or plasticizers, and 0-5% other ingredients, wherein the percentages are percents by weight.
Dependencies are inferred from the claim text.