Method and apparatus for producing and fixing a visible image on

Details Method and apparatus for producing and fixing a visible image on Method and apparatus for producing and fixing a visible image on

1975-12-01

1978-04-04

Shoop, William M.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 9, G03G 1500

Patent

active

040824411

ABSTRACT:
In a system especially suited to holography a transparent photoconductive material comprises a glass substrate, an electroconductive heating layer formed on the substrate, a photoconductive layer formed on the electroconductive layer and a thermoplastic layer formed on the photoconductive layer. The photoconductive material is electrostatically charged and radiated with a coherent light image to produce an electrostatic image across the thermoplastic layer. An electric voltage is applied to the electroconductive heating layer to produce heat which softens the thermoplastic layer. The electrostatic force of the electrostatic image across the thermoplastic layer causes the same to deform and produce a diffraction pattern which constitutes a holographic representation of the light image. A photosensor is disposed in a position to sense the intensity of light which is diffracted by the diffraction pattern which is in the process of being formed. A differentiating circuit differentiates the output of the photosensor and produces an output signal to terminate application of the electric voltage to the electroconductive heating layer to thereby terminate heating of the photoconductive material when the first derivative of the photosensor output reaches a value of zero. This corresponds to the maxima of the photosensor output which occurs when the formation of the diffraction pattern is maximum and further application of heat would cause the diffraction pattern to dissolve. The thermoplastic layer has fast thermal response so that it solidifies quickly when heat is removed and the diffraction pattern is formed to a maximum extent.

REFERENCES:
patent: 3730621 (1973-05-01), Sullivan
patent: 3795514 (1974-03-01), Jvirblis et al.

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