Claims
- 1. 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. A process according to claim 1 wherein said base layer contacts at least one of electrically conductive surface regions in which said electrically conductive layer of the planar rigid base is subdivided, said electrically conductive surface region being grounded at the start and during the electrostatic charging of said photoconductive thermoplastic recording layer.
- 3. A process according to claim 1 including charging said thermoplastic photoconductive layer in locally bounded regions for recording of partical relief images and forming said partial relief images by applying voltages during the exposure on said electrically conductive surface regions on said planar rigid base, whereby said surface regions correspond to said bounded regions, the polarity of said voltages being equal or opposite to a polarity of a voltage for charging said thermoplastic photoconductive layer.
- 4. A process according to claim 1 wherein the recording material faces with its thermoplastic photoconductive layer the intermediate layer positioned on said rigid base during the recording of a deformation image.
- 5. A process according to claim 4 wherein the intermediate layer is a dielectric liquid layer spread between said photoconductive thermoplastic layer and said rigid base by capillary action.
- 6. A process according to claim 1 including bringing said recording material into a uniformly planar physical contact free of air bubbles with said rigid base by electrostatic attraction between the said recording material and said rigid base, said attraction being effected at the start of the electrical charging of said recording material by a corona device moved slowly over said recording material and applying an electrostatic contact pressure on said rigid base.
Priority Claims (1)
Number |
Date |
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2212968 |
Mar 1972 |
DEX |
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Parent Case Info
This is a continuation, of application Ser. No. 588,564, filed June 19, 1975, now abandoned in turn, a continuation of Ser. No. 341,335, filed Mar. 15, 1973, now abandoned.
US Referenced Citations (7)
Non-Patent Literature Citations (2)
Entry |
Lorant, British Journal of Photography, 9/64, vol. III, #5435, pp. 752, 753, 766. |
Sullivan et al., Photographic Science and Engineering, vol. 8, #4, 7/64, pp. 206-211. |
Continuations (2)
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Number |
Date |
Country |
Parent |
588564 |
Jun 1975 |
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Parent |
341335 |
Mar 1973 |
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