Abstract: A high performance light valve for optimizing the switching of a liquid crystal on an area basis. The light valve uses a transparent charge separation layer to allow for the accumulation of photo-generated charges. The light valve concentrates the light absorption in a narrow charge generation region where high electric fields are present from the junction of dissimilar semiconductor materials. The light valve has a switching characteristic dominated by the light and dark carrier densities in a narrow reversed biased region.

Abstract: An electrophotographic camera is disclosed. The camera employs a novel photoconductive plate, the composition of which is disclosed together with the method of making same. In the camera, a photo image to be recorded is focused thrugh an optically transparent substrate and transparent electrode onto the back surface of a photoconductive layer. The charge-retentive surface of an electrographic recording paper is disposed adjacent the photoconductive layer and the conductive backing of the paper is connected to an electrode for impressing a charge transfer potential across the photoconductor layer and the charge-retentive layer of the paper. When the potential is impressed across the photoconductor, electrons liberated in the photoconductor by the photon image to be recorded are transferred to the charge-retentive surface of the recording paper to form a charge image of the object to be recorded. The charge image is subsequently developed by applying charged toner particles to the image for developing same.

Abstract: In an electrophotographic camera, a photon image to be recorded is focused through an optically transparent substrate and transparent electrode onto the back surface of a photoconductive layer. The charge-retentive surface of an electrographic recording paper is disposed adjacent the photoconductive layer and the conductive backing of the paper is connected to an electrode for impressing a charge transfer potential across the photoconductor layer and the charge-retentive layer of the paper. When the potential is impressed across the photoconductor, increased conduction caused in the photoconductor by the photon image to be recorded are establish a charge transfer to the charge-retentive surface of the recording paper to form a charge image of the object to be recorded. The charge image is subsequently developed by applying charged toner particles to the image for developing same.