Abstract: Thermoplastic recording member in which a thermoplastic film recording layer is formed on a conductive support with the optional provision of an intermediate photoconductive layer, the resin film containing from 0.1 to 10% by weight of a silicone, fluorocarbon or chlorofluorocarbon oil, based on the weight of the film.

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.

Abstract: A holographic recording process uses a thermoplastic photosensitive member in which charging on the member and exposing the same to light having holographic information are carried out simultaneously, and an unevenness image corresponding to the information is ultimately formed on the member through a heating and a cooling step. The charging rate, charging-exposing time interval, light intensity and other factors are chosen to assure a high quality recording and hence a favorable image reproduction. In particular, the charging rate is chosen from those which lie in a region of characteristic curves above the line corresponding to 7 dB S/N ratio, the characteristic curves representing the relationship between the S/N ratio of the reproduced holographic image and the charging rate with parameters of the light intensity and the charging-exposing time interval. Further, if 15 dB S/N ratio is used as the limiting line, more than 30 times repeated use of the thermoplastic member is possible.

Abstract: A phase mask for use in a holographic apparatus comprising a combination of phase mask and data mask and being so devised that an illuminant beam transmitting these masks is irradiated on a Fourier transform plane together with a reference beam coherent with said illuminant bean, said phase mask being composed of a transparent plate and random undulations formed on the surface of said transparent plate by coating a solution of high molecular weight compound by means of a spin coater.