Abstract: An image to be printed in a CRT or video color printer is sensed to generate red, blue and green signals respectively representing a characteristic of the image in red, blue and green. The signals are processed in a matrix circuit to generate a luminance signal. The red and blue signals are subtracted from the luminance signal in operational amplifiers to obtain unadjusted difference signals. Each of the unadjusted difference signals is multiplied by an adjusting factor which is established using variable resistors and functions to provide level adjustment. The adjusted difference signals obtained in this manner are subtracted from the luminnce signal in respective operational amplifiers to yield modified red and blue signals. The modified red and blue signals are processed together with the luminanace signal in a second matrix circuit to generate a modified green signal.

Abstract: For improving the electrical contact between an insulating image carrier and a conductive support during development of an electrostatic charge image in electrographic recording processes a gas permeable support is used through which gas ions are brought to the back of the carrier while development takes place on the image side.

Abstract: Apparatus for developing latent electrostatic images on dielectric carrier sheets has a rotary cylinder whose periphery supports a carrier sheet with a latent image thereon, and a metallic block having a concave surface which constitutes a grounded electrode and defines with the exposed side of the carrier sheet on the cylinder a narrow gap of constant or gradually decreasing width, as considered in the direction of rotation of the cylinder. The block has alternating fluid-admitting and fluid-evacuating orifices which communicate with the gap and extend transversely of the path of movement of the carrier sheet. Each fluid-admitting orifice is nearer to the preceding than to the next-following fluid-evacuating orifice, and the width of the fluid-evacuating orifices exceeds the width of the fluid-admitting orifices. The block is located below the cylinder and the fluid-evacuating orifices communicate with a collecting tank into which spent developing fluid flows by gravity.

Abstract: In a process for the transfer printing of charge images the carrier of a primary charge image is covered with an insulating film the backside of which is electrically charged by means of a corona discharge under concentrated gaseous nitrogen, and the film now carrying the secondary charge image is subsequently removed from the carrier of the primary charge image.

Abstract: In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprises a heating arrangement at the fixing station for fixing an image on a sheet, and a conveyor arrangement for advancing the sheet through the station at a predetermined speed sufficient to permit the heating arrangement to fix the image on the sheet. An automatic de-actuating timing switch is employed to prevent charring of the sheet in the event that the latter is advanced through the fixing station at a speed lower than said predetermined speed.

Abstract: In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprises a heating device at the fixing station for fixing an image on a sheet, and a conveyor device for moving the heating device relative to a sheet located in the fixing station at a predetermined speed sufficient to permit the heating device to fix the image on the sheet and also to prevent charring of the latter. A sheet-advancing device advances a sheet through the fixing station in direction opposite to the direction of movement of the conveyor device so as to increase the relative speed between the heating device and the advancing sheet. The movement of the heating device relative to the sheet prevents charring or burning of the sheet in the event that the sheet-advancing device malfunctions and advances a sheet at speeds lower than its normally rated speed, including zero speed, i.e.

Abstract: For reproduction on a television receiver, movie film is moved continuously past a scanning region. Each image is scanned three times in direction opposite to film motion, the starting point of each scan being displaced one-third of image height in direction of motion of film.

Abstract: An electric charge is created on a moving reproduction carrier by each of a plurality of electrodes extending in a line perpendicular to the direction of transport of the reproduction carrier. Each of the signals applied to the electrodes has an amplitude corresponding to the density of the corresponding point of the original. The charge created by the electrode has undesirable variations resulting from differences in the electrode characteristics and from differences in the amplifiers amplifying the signal before application to each electrode. After each charge distribution from a copy has been created, a test signal is supplied to the inputs of all amplifiers. This creates a test charge distribution on the reproduction carrier. After developing of the reproduction carrier the test line created by developing of the test charge distribution is scanned photoelectrically.

Abstract: A color copying apparatus wherein a copy carrier sheet is attracted by the suction chamber of a carriage which is reciprocable along a horizontal path past an exposure station and along a battery of aligned developing units. After each exposure with a different filter, the sheet is moved into register with a different developing unit. The carriage is moved by an endless belt which has a pin receivable in one of two vertical slots on a plate-like female coupling member of the carriage. Guide rollers automatically disengage the pin from the coupling member when the carriage reaches the exposure station. The suction chamber is then attracted by electromagnets so that two sockets of the suction chamber move downwardly and receive stationary centering pins which hold the carrier in a predetermined position during each of a series of exposures. This insures accurage register of successively projected and developed images in the three basic colors.

Abstract: An electrophotographic copying machine wherein electrostatic images at the periphery of a rotary cylindrical printing base are transported below a grounded developing electrode having in its concave underside a series of shallow grooves each receiving fresh liquid toner through one or more inclined supply ports at the upstream end and each discharging spent liquid toner into one or more inclined evacuating ports at the downstream end thereof. The flow of liquid toner in the grooves is laminar, and the speed of liquid flow in the grooves equals or approximates the speed of movement of the printing base relative to the electrode. The electrode carries several distancing rolls which extend beyond its underside and the electrode is biased by springs so that the distancing rolls bear against and roll along the periphery of the printing base.

Abstract: An original bears a pictorial image, or the like. The original is illuminated with first and second light and the image on the original is projected onto a copy carrier. The spatial variation of the intensity of the first light after the first light has been modulated in intensity by the image on the original is detected. The contrast of the image projected onto the copy carrier compared to the contrast of the image on the original is changed by changing the spatial variation of the second light in dependence upon the detected spatial variation of the intensity of the modulated first light.

Abstract: For reproduction on a television receiver, movie film is moved continuously past a scanning region. Each image is scanned three times in direction opposite to film motion, the starting point of each scan being displaced one-third of image height in direction of motion of film.

Abstract: A method and optical arrangement for recording on a light-sensitive surface utilizing a laterally moving lenticular grating. The method aims at achieving gradual tonal or tint variations on the recording medium.