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US 4,995,685 AGranted
Method and system for making a reflection hologram
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark L. Armstrong, Daniel J. Mickish
Life of this patent
Estimating the term…
Abstract
The invention relates to a method and system for making reflection holograms and, more specifically, for making reflection holograms from a cylindrical surface of a master. Means are provided to direct substantially monochromatic actinic radiation through a recording medium sensitive to such radiation coupled to the cylindrical surface of the master such that the angle of incidence of the radiation on the master is substantially constant.
Claims25
A system for making a reflection hologram comprising:
- an at least partially reflective or diffractive master having a cylindrical surface symmetric about an axis;
- a holographic recording medium coupled to the master cylindrical surface;
- and
- means for directing a reference beam of substantially coherent radiation through the recording medium to the master cylindrical surface, the directing means including means for focusing the radiation so that the angle of incidence of the radiation on the master is substantially constant,
- such that when the directing means directs the reference beam through the recording medium, an object beam reflects off the master and passes back through the recording medium interfering with the reference beams forming a reflection hologram in the recording medium.
2 more elements
A method of making a reflection hologram comprising the steps of:
- coupling a holographic recording medium to a cylindrical surface of an at least partially reflective or diffractive master;
- and
- directing a reference beam of substantially coherent radiation through the holographic recording medium to the cylindrical surface of the master so that the angles of incidence of the radiation on the master are substantially constant to expose the recording medium by the reference beam and by an object beam which is the reference beam reflected or diffracted from the master.
Dependencies are inferred from the claim text.