Plain paper reproduction process

A light sensitive photographic process for producing a permanent record on plain paper of a light image which comprises:

• (a) exposing to said image the surface of a photodielectric recording medium supported on a plastic belt, said photodielectric medium comprising a layer of a homogeneous intimate mixture of photodielectric pigments dispersed in a binder which exhibits a change of dielectric constant and dielectric loss factor in those areas of said photodielectric recording medium exposed to said light image and forming as a result of exposure to said image a latent image in terms of local variations of dielectric constant and dielectric loss factor in said photodielectric recording medium;
• (b) contacting the surface of said exposed photodielectric recording medium with the surface of a plain paper image receiving sheet backed with a plastic substrate coated with an image forming medium comprising a dispersion of sublimable dyes in a binder, the surface of said image forming medium being in contact with said plain paper image receiving sheet;
• (c) impressing a high frequency electric field through said photodielectric recording medium, plain paper image receiving sheet and image forming medium to provide the sublimation of the sublimable dyes of said image forming medium in selected areas corresponding to said light image onto said plain paper receiving sheet by selective generation of heat due to dielectric losses in said photodielectric recording medium, said heat generation in said photodielectric recording medium being substantially proportional to the change in dielectric constant and dielectric loss factor in said photodielectric recording medium according to the previous exposure of said medium to said radiation image, thereby producing a photographic record of the image made of sublimed dyes from said image forming medium onto said plain paper image receiving sheet.