Abstract: An electrostatic image recording device in which an image is projected by an optical projecting system upon a charged, supported electrophotographic member to form a latent image on the photoconductive surface thereof. A container of toner in liquid suspension is provided with a spongelike member interior thereof and which has a relatively rigid foraminous wall, the remaining walls being flexible. The container and the supporting structure are moved one relative the other with the foraminous wall proximate the surface carrying the latent image and the toner suspension is pumped onto the said surface flooding same. The pumping is performed by temporarily collapsing the flexible said walls of the container with excess toner sucked up by return of the container to its normal condition.

Abstract: An electrostatic imaging method wherein the photoconductive coating of an electrophotograhic film is charged simultaneously with its exposure to a scene to be recorded, the charging step ceasing when a level of charge has been reached which is optimum for the light condition of the scene and with toning being commenced immediately subsequent to the cessation of the charging. Light from the scene is cut off immediately prior to commencement of toning. The film utilized is capable of accepting a charge at a rate faster than the light of a scene to be recorded discharges the film.The method is preferably practiced utilizing a camera which includes projecting means for prjecting a scene onto the film, a corona generating system, a toning system, means for measuring the light coming through the projector, means for measuring the surface potential of a dark area of the flm while it is being charged and an electronic control circuit which operates the charging system in response to the measured light.

Abstract: A method for charging an electrophotographic member which includes rotating a number of elongate corona electrodes, which are positioned parallel to and a predetermined distance from a central axis, about the central axis while simultaneously applying a corona voltage to each of the electrodes whereby each develops a corona, so that a substantially uniform corona charge is applied to the entire electrophotographic member. An additional step, performed simultaneously with production of the corona and rotation of the electrodes, can be the movement of one of the rotating electrodes and the electrophotographic member relative to the other with a predetermined distance being maintained between the member and central axis. Apparatus employed to perform this method also is disclosed.

Abstract: Strip film of the conventional silver halide emulsion type is duplicated by optically projecting the images onto a high speed electrophotographic film in a system comprising a flow type camera having the original film and the electrophotographic film travelling at the identical film speed. The first station for the electrophotographic film is a charging station, followed by the projection slit, a toning station and a toner fixing station.The background density of the original film is measured by photometric means and compared with preset density standards, the resulting information being used to enhance the image produced on the electrophotographic film by varying the charge voltage level. Charge level will control the amount of toner which adheres for a given time of toning.

Abstract: An electrophotographic film member is exposed to an image source, such as a cathode ray tube display unit, and the latent image toned to form a temporary visible image on said film member at a first station. The film member carrying the temporary visible image is stepwise translated to a projection station where it is projected in an enlarged display upon a suitable receptor surface. Thereafter, the film member is stepwise translated to an erase station where the toner is removed and the film member made ready for reuse to receive another image. The first station includes suitable structure for charging the film member, a selectively operable blind or shutter for exposing the charged film member to the image source and an applicator for applying suitable toner from a toner source to the exposed film member. The toner particles adhere tenaceously but removably to the exposed film member without any fixing or fusing process and hence, the toner can be removed from the film member afer projection.