Abstract: The present invention provides an inkjet ink which is excellent in image quality and high-speed printing on plain paper, in storage stability and in ejection stability and gives less load on a maintenance device for an inkjet recording apparatus; and an ink cartridge, an inkjet recording apparatus, and an inkjet recording method, using the inkjet ink. An inkjet ink containing a water dispersion of pigment-containing water-insoluble vinyl polymer particles; a water-soluble organic solvent; and water, wherein an ink residue from the inkjet ink has a viscosity of 3,000 mPa·s or less, the ink residue is obtained by leaving the inkjet ink to stand at a temperature of 25° C. and a humidity of 15% until substantially no mass change occurs, and wherein the inkjet ink, pH of which is adjusted to 7 with an acid, has a viscosity of 500 mPa·s or more.

Abstract: A liquid jetting device treatment liquid containing no colorant including a N-alkyl-2-pyrrolidone represented by the following General Formula 1: General Formula 1 where R represents an alkyl group having 8 to 11 carbon atoms.

Abstract: To provide an aqueous ink for a liquid jetting device, containing: (A) a fluorosurfactant; and (B) N-alkyl-2-pyrrolidone, wherein an alkyl group contained in the (B) N-alkyl-2-pyrrolidone is a C4-10 alkyl group.

Abstract: To provide an image forming method, which contains: treating a surface of a recording medium with acid, an oxazoline group-containing polymer, and adipic acid dihydrazide.

Abstract: The present invention provides an inkjet ink which is excellent in image quality and high-speed printing on plain paper, in storage stability and in ejection stability and gives less load on a maintenance device for an inkjet recording apparatus; and an ink cartridge, an inkjet recording apparatus, and an inkjet recording method, using the inkjet ink. An inkjet ink containing a water dispersion of pigment-containing water-insoluble vinyl polymer particles; a water-soluble organic solvent; and water, wherein an ink residue from the inkjet ink has a viscosity of 3,000 mPa·s or less, the ink residue is obtained by leaving the inkjet ink to stand at a temperature of 25° C. and a humidity of 15% until substantially no mass change occurs, and wherein the inkjet ink, pH of which is adjusted to 7 with an acid, has a viscosity of 500 mPa·s or more.

Abstract: A semiconductor integrated circuit constructed on a single chip. Either one of a signal inputted to a clock signal input terminal and a signal obtained by dividing the frequency of the clock signal inputted to the clock signal input terminal is selected by a selecting circuit responsive to a selection signal supplied from the exterior of the chip to be supplied to a control circuit. Consequently, the frequency dividing circuit can be bypassed in response to the selecting circuit. Accordingly, it is possible to easily provide operation at a high frequency exceeding the maximum operating frequency of component devices forming the semiconductor integrated circuit. This can be done by connecting an external circuit having the same function as that of the circuit bypassed and capable of higher-speed operation.

Abstract: An ink ribbon cassette is constructed such that it is unnecessary to wind off an ink ribbon at the start of every line printing process. The cassette includes two pairs of reels, each pair including an ink ribbon-winding off reel and an ink ribbon-winding up reel. The pairs of rails are rotatably mounted one above the other on a cassette casing which is detachably mounted on a carriage of a printer. The casing is provided with a driving shaft which is rotated in normal and reverse directions in response to reciprocal movement of the carriage. The driving shaft being provided with two one-way clutches transmitting the rotation of the shaft in opposite directions. Conveying members separately convey the ink ribbons for the respective pairs of reels and are driven by respective to the one-way clutches.