Multicolor holgraphic replication by masking
AssigneeE. I. Du Pont de Nemours and Company
InventorsBrett Ronald Nelson, Michael G. Fickes
Life of this patent
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Abstract
A multicolor hologram (e.g., a two-color hologram) is replicated (copied) into a photosensitive layer by masking to produce a copy (replicate) of the hologram in a manner such that the copy is an accurate and true replication of the hologram (e.g., master hologram) and the copy is characterized to possess a high brightness level and color fidelity comparable to that of the multicolor hologram that was replicated. Both flood and scan modes can be employed in the replication.
Claims17
A method for replicating a volume reflection master hologram comprising, in sequence as listed below:
- a) providing a photosensitive layer having a side and an opposing side,
- b) placing the side of the photosensitive layer in contact with or proximate to the master hologram;
- c) placing a first mask in contact with or proximate to the opposing side of the photosensitive layer masking at least one area of the photosensitive layer;
- d) exposing the photosensitive layer through the first mask with coherent actinic radiation of a first wavelength λ1 resulting in a first wavelength exposed layer;
- e) removing the first mask;
- f) placing a second mask in contact with or proximate to the opposing side of the photosensitive layer that is now the first wavelength exposed layer masking at least one area of the first wavelength exposed layer;
- g) exposing the first wavelength exposed layer with coherent actinic radiation of a second wavelength λ2 resulting in a first and second wavelength exposed layer;
- h) removing the second mask;
- and
- i) exposing the first and second wavelength exposed layer with coherent actinic radiation of a third wavelength λ3 resulting in a first, second and third wavelength exposed layer, wherein the first, second and third wavelength exposed layer is a replicate of the volume reflection master hologram.
A method for replicating a volume reflection master hologram comprising:
- a) providing a photosensitive layer having a side and an opposing side;
- b) placing the side of the photosensitive layer in contact with or proximate to the master hologram;
- c) placing a first mask in contact with or proximate to the opposing side of the photosensitive layer masking at least one area of the photosensitive layer;
- d) exposing the photosensitive layer through the first mask with coherent actinic radiation of a first wavelength λ1 resulting in a first wavelength exposed layer;
- e) removing the first mask;
- f) placing a second mask in contact with or proximate to the opposing side of the photosensitive layer that is now the first wavelength exposed layer masking at least one area of the first wavelength exposed layer;
- g) exposing the first wavelength exposed layer with coherent actinic radiation of a second wavelength λ2 resulting in a first and second wavelength exposed layer;
- h) removing the second mask;
- i) placing a third mask in contact with or proximate to the opposing side of the photosensitive layer that is now the first and second wavelength exposed layer masking at least one area of the photosensitive layer;
- j) exposing the first and second wavelength exposed layer with coherent actinic radiation of a third wavelength λ3 resulting in a first, second and third wavelength exposed layer;
- and
- k) removing the third mask;
- wherein the first, second, and third wavelength exposed layer is a replicate of the volume reflection master hologram.
Dependencies are inferred from the claim text.