Abstract: A liquid electrophotographic color image forming apparatus includes a main charger for charging a surface of a photoreceptor web to a predetermined charging electric potential, an optical scanning unit for scanning light onto the photoreceptor web to form an electrostatic latent image, and developing rollers for yellow, cyan, magenta and black colors, sequentially installed in a direction that the photoreceptor web circulates, for developing the electrostatic latent image using developer for each color. Further included are auxiliary chargers for cyan, magenta and black colors, installed downstream of each of the developing rollers, for additionally charging the photoreceptor web, the electric potential of which is lowered after development for each of yellow, cyan and magenta colors.

Abstract: An ink for a liquid electrophotographic color printing system is optimized to reduce the lowering of image density due to wash-off, to obtain a stable over-toned color, and to have a wide reproducible color gamut. The ink includes a plurality of toners for yellow (Y), magenta (M) and cyan (C), each toner being provided in a respective one of a plurality of developing devices, and each toner having a pigment (p) for forming an image having a predetermined color, a binder (b) for binding the pigment on printing paper, a charge controller for imparting electrical properties on the toners, and a stabilizer. A carrier transfers the toners from the developing devices to a photoreceptor belt during development. The blending ratio (b/p) of the binder (b) to the pigment (p) of each toner for yellow (Y), magenta (M) and cyan (C) satisfies the following expressions: b/pyellow(Y)=5±1; b/pmagenta(M)=7±1; and b/pcyan(C)=8±1.

Abstract: A liquid electrophotographic color image forming apparatus includes a main charger for charging a surface of a photoreceptor web to a predetermined charging electric potential, an optical scanning unit for scanning light onto the photoreceptor web to form an electrostatic latent image, and developing rollers for yellow, cyan, magenta and black colors, sequentially installed in a direction that the photoreceptor web circulates, for developing the electrostatic latent image using developer for each color. Further included are auxiliary chargers for cyan, magenta and black colors, installed downstream of each of the developing rollers, for additionally charging the photoreceptor web, the electric potential of which is lowered after development for each of yellow, cyan and magenta colors.

Abstract: An electrophotographic printer including: a photosensitive belt moving along a circular path and supported by a plurality of rollers; a main corona device for increasing an electrical charge potential on a surface of the photosensitive belt to a predetermined level for development; first, second, third and fourth laser scanning units for forming an electrostatic latent image on the photosensitive belt by color; first, second, third and fourth developing units for individually developing the electrostatic latent image using first, second, third and fourth developing solutions of different colors; a drying roller pressing the photosensitive belt for removing carrier from the developing solutions developed on the photosensitive belt, the drying roller being frictionally charged positively through contact with the photosensitive belt; an eraser for removing an electrostatic charge remaining on the photosensitive belt after development to uniformly electrify the surface of the photosensitive belt with exposing cha

Abstract: An image forming apparatus includes a plurality of image forming units having photoconductive devices for forming a latent image and developing devices for developing the latent image, an exposing device for selectively moving to and exposing the respective photoconductive devices, an endless transfer belt for conveying a sheet of paper with respect to the photoconductive devices, and transfer chargers. The apparatus is compact because only the light and small exposing device shifts, thereby enhancing picture quality and performing high-speed printing in stable driving.