Fuji Photo Film Company, Limited

Fujifilm Corporation

Chikashi Ohishi

Hidefumi Sera

Keisuke Shiba

Hiroshi Takahashi

Keiichi Adachi

Sho Nakao

Chiaki Kawamoto

Takao Nakayama

Kenji Kunichika

Koji Furukawa

Tetsuro Fuchizawa

Ikuo Kawauchi

Hiroyuki Sasayama

Hiroyuki Tamaki

Yasuzi Asao

Kiyoshi Iwamoto

Akira Hasegawa

Hisao Kanzaki

Yoshikatsu Kagawa

Hiromi Yazawa

Masato Iwai

The ink jet recording apparatus includes an ejection head for ejecting ink droplets toward a recording medium by exerting electrostatic force onto ink containing charged colorant particles, an ink tank for reserving the ink to be supplied to the ejection head, a circulation path for circulating the ink between the ejection head and the ink tank, and a cleaning mechanism for cleaning the ejection head and the circulation path using cleaning liquid. The cleaning liquid circulated through the circulation path at a time of cleaning by the cleaning mechanism is obtained by adding a charge control agent to an ink dispersion medium.

Ink jet recording apparatus

An ink jet recording apparatus has an ink jet head for ejecting ink. The ink jet recording apparatus includes a main tank for reserving the ink; a supply sub-tank for reserving the ink supplied from the main tank and supplying the ink to the ink jet head with a static pressure method; an ink circulation system including a first supply piping for connecting the main tank and the supply sub-tank to each other; and a filter provided on an ink circulation path of the ink circulation system on an ink jet head side with respect to a gas-liquid interface of the supply sub-tank at a time of ink circulation. The ink circulation system circulates the ink among the main tank, the supply sub-tank and the ink jet head. The ink circulation system is constructed so that at least a part of the ink passed through the first supply piping is directly ejected to one of a surface of the filter on an ink jet head side and a surface of the filter on a gas-liquid interface side.

The improved transporting apparatus for scanning exposure of a recording material as it is fixed on an exposure mount which is moved by means of a screw transmission mechanism is characterized in that the exposure mount for transporting the recording material is composed of a platen for carrying the recording material and a transport plate that holds the platen and which engages the screw transmission mechanism, with the platen and the transport plate being designed to be capable of relative displacement by small amounts, preferably in a non-contact relationship. Optionally, urging members may be provided to combine with the platen and the transport plate to form a vibration system that composes a vibration filter. The apparatus effectively absorbs not only vibrations that originate from the drive system to be transmitted to the exposure mount via the travelling nut of the screw transmission mechanism, as exemplified by erratic rotation or vibrations of the motor and the screw shaft of the screw transmission mechanism, but also vibrations due to externally applied forces and, hence, highly precise scanned transport of the recording material can be accomplished while suffering from very small levels of unevenness in the speed of its transport that will occur on account of those unwanted vibrations.

Transporting apparatus for scanning exposure

A sheet-like material processing apparatus in which while a sheet-like material is interposed between and conveyed by a pair of rollers, excess processing solution is squeezed out from the sheet-like material, and the sheet-like material is processed. A solution supplying portion is provided at an upstream side of the pair of rollers and drips the processing solution. A blade-like member is provided at the upstream side of the pair of rollers. Movement of the processing solution is limited by the pair of rollers and the blade-like member.

Sheet-like material processing apparatus

A liquid electrophotographic developing device for developing a charged and exposed photoconductive material which includes a photoconductive layer formed on one surface of a conductive layer. The liquid electrophotographic developing device is comprised of developing section, a developing solution tank provided in a housing and filled with a developing solution, conveying rollers for conveying the photoconductive materials, a developing electrode and a back electrode which are disposed parallel along a conveying path of the photoconductive material in the developing section, and a developing solution supplying device disposed above the developing electrode. The developing electrode is spaced part from the photoconductive layer, and the back electrode is disposed to come into contact with the back surface of the photoconductive material. Upon directly connecting the electrodes, toner particles contained in the developing solution adhere to the photoconductive layer to achieve development. The developing electrode does not touch the photoconductive layer to make a developed image free from soiling. The housing is covered with a lid to prevent the vaporizing of the developing solution. The developing solution is circulated through the developing section by a circulating device.

Liquid electrophotographic developing device and method thereof

A liquid electrophotographic developing device for developing a photoconductive material charged and exposed and which has a photoconductive layer formed on one surface of a conductive layer comprises a developing tank filled with a developing solution in which a developing electrode and a back electrode are disposed. The electrodes are immersed in the developing solution and disposed on either side of the photoconductive material in conveyance. The back electrode comes into contact with the back surface of the photoconductive material, whereas the developing electrode is spaced part from the photoconductive layer. Upon directly connecting the electrodes, toner particles contained in the developing solution adhere to the photoconductive layer to achieve development. The developing electrode does not touch the photoconductive layer, making a developed image free from soiling, the electrodes are immersed in the developing solution, preventing the drying and solidifying of the solution around the electrodes, and the developing tank is covered with a lid, preventing the vaporizing of the developing solution.

Liquid electrophotographic developing device

A liquid electrophotographic development method where electrodes are arranged only on the side of the photosensitive layer of a master, developing liquid is supplied between the master and the electrodes, and conductors are made to come into contact with the base of the master so that an electric field is generated between the photosensitive plane and the electrodes for development. The electrode to be used for the electrophotographic development method includes conductive wires of a plural number which are arranged in the direction perpendicular to the traveling direction of the material so as to come into contact with the conductive base thereof. If the electrodes are utilized, a main electrode needs to be arranged only on the side of the photosensitive layer of the master, and developing liquid is supplied therebetween. The electrode is adapted to come into contact with the conductive base of the master, to thereby generate an electric field between the main electrode and the electrode. Therefore, the master can be directly injected with electrons instead of indirect injection, and adhesion of toner scum which often was caused in the prior art can be avoided. This further eliminates the trouble of cleaning the electrodes to improve maintenance.

Liquid developing method and apparatus for electrophotography, and

An electrophotographic lithographic printing plate precursor which is suitable for not only the ordinary developing methods but also the developing methods of direct electron injection system and which after developing, can readily be wound and fixed, as a lithographic printing plate, around a drum of a printing machine without any slippage after winding is provided. This precursor comprise a base of paper coated, on both surfaces thereof, with .alpha.-polyolefin laminated layers each having a volume resistivity of at most 1.times.10.sup.10 .OMEGA. and being further provided, on one side thereof, with a photoconductive layer and on the other side thereof, with an over back layer having a surface resistivity of at most 1.times.10.sup.10 .OMEGA. and a larger friction coefficient than the .alpha.-polyolefin laminated layer.

Electrophotographic lithographic printing plate precursor with over back

An electrophotographic lithographic printing plate precursor capable of giving a good image free from pinholes is provided which comprises an electrically conductive base coated, on one side thereof, with an undercoated layer and a photoconductive layer containing zinc oxide as a predominant component in order and on the opposite side thereof, with a back layer, said undercoated layer having a surface resistivity of 1.times.10.sup.8 to 1.times.10.sup.14 .OMEGA. and said back layer having a surface resistivity of at most 1.times.10.sup.10 .OMEGA..

Electrophotographic lithographic printing plate precursor and a method

An electrophotographic lithographic printing plate is described, comprising an electrically conductive support and a photoconductive layer on the support, said layer being made mainly of a photoconductive zinc oxide and a resin binder, wherein in the surface of the photoconductive layer, the degree of exposure of photoconductive zinc oxide is from 10% to 70%.

Electrophotographic lithographic printing plate

A process for producing a light-sensitive lithographic plate requiring no dampening solution comprising (1) carrying out corona discharge treatment on the surface of a silicone rubber layer of a light-sensitive lithographic plate requiring no dampening solution wherein the silicone rubber layer is the top layer, (2) spraying a solution or dispersion containing a non-volatile solid component on said silicone rubber layer, and (3) drying to provide fine projection patterns on said silicone rubber layer.

Process for producing light sensitive lithographic plate requiring no

An electrophotographic photoreceptor having on a conductive support an interlayer and a photoconductive photoreceptive layer in that order, with the interlayer containing at least one colloidal substance selected from colloidal silica and colloidal alumina, and an organic solvent soluble resin which is composed of

Electrophotographic photoreceptor

An electrophotographic plate making material comprising a substrate comprising a paper support and a polyolefin laminate layer on at least one surface thereof and having a volume resistance of 10.sup.10 ohms or less, and a photoconductive layer on the substrate.

Process for preparing a lithographic printing plate

An electrophotographic lithographic printing material comprised of a conductive support, an interlayer, and a photoconductive layer is disclosed. The conductive support is comprised of a conductive paper laminated with carbon-containing polyethylene on both surfaces thereof using, as the interlayer, a polymer having the constructing units shown by following formulae and an acid value of 10 to 100; ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group, R.sub.2 represents a hydrogen atom, a methyl group, or an ethyl group; and n is an integer of 1 to 10, ##STR2## wherein R.sub.3 represents a hydrogen atom or a methyl group.

Electrophotographic element with copolymer interlayer

A process for producing a printing plate and a printing plate making machine are disclosed. The process involves providing an electrophotographic plate making material which includes a base having a low conductive layer thereon. The material is electrically charged and imagewise exposed. The imagewise exposed material is subjected to liquid toner development with a toner containing a solvent. The solvent is then substantially removed by heating the material to a temperature sufficient to cause the evaporation of the solvent. The material is then moved to a substantially isolated fixing area and again heated in order to fix a toner image on the plate making material. The process can be quickly and easily carried out and eliminates the danger of the explosion of solvent vapors.

Growing community of inventors

Shizuoka, Japan

Chikashi Ohishi