A test method for estimating the life expectancy of a high density rewritable optical media, such as DVD (Digital Versatile Disc), storing digital information has been discussed. In this report, a test method was examined by using an Eyring acceleration model and statistics techniques. Statistical distribution of life data for the optical disc assumed lognormal distribution, and an analysis of statistics techniques based on the ISO standard proposed as a life expectancy presumption method of the CD-R.

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Triphenyl-pararosaniline (TPPR) and n-propyl gallate (PG) are charge-control agents (CCA)of the positive and negative type, respectively. Suganami et al. reported that a 1:2 complex of TPPR and PG (colored deep blue) is a powerful CCA of the positive type due to the formation of a charge-transfer (CT) complex. The electronic structure of the complex has been studied in the present investigation in solution and in the solid state in order to clarify the charge-transfer mechanism. Quite contrary to our expectation, the blue color is found to arise from protonation of TPPR by means of PG, not due to a CT transition between TPPR and PG. The charge-control ability of the 1:2 complex is then attributed to the property of protonated TPPR.

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3,5-Di-tert-butyl-2-hydroxybenzoic acid (TBS) and 3,5-di-tert-butylsalicylate zinc complex (SZC) are charge-control agents of the negative type used in electrophotography. Structure analysis of TBS and SZC has been carried out on single crystals recrystallized from solution in ethanol, acetonitrile, dimethylsulfoxide (DMSO) and dimethylacetamide (DMA). In TBS, there are two independent molecules A and B in the asymmetric unit. The molecules form centrosymmetric dimers A-A and B-B via pair of O-H…O hydrogen bonds between the two carboxyl groups. On the other hand, a variety of solvated SZC have been isolated: SZC/(ethanol)₂, acetonitrile-solvated Zn-complex of TBS, SZC/(DMSO)₂, SZC/(H₂O)₃(DMA)₃ and SZC/(H₂O)₂(DMA)₃. In these complexes, TBS molecules are coordinated to the central Zn as mono or bidentate ligands, depending on the recrystallization solvent as well as recrystallization conditions. These results suggest that the structural changes can also occur in the toner preparation process, resulting in scattered characteristics of the charge-control ability.

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n-Propyl gallate (PG) is a charge-control agent (CCA) of the negative type used for toners in the electrophotographic process. Suganami et al. found that PG enhances greatly the charge-control power of triphenyl-pararosaniline (TPPR: an electron donor due to amino groups) used as the positive type, where PG works as an electron acceptor (i.e. acid) due to three phenolic hydroxides to form a 1:2 charge-transfer complex of TPPR/PG. However, judging from the 1:2 ratio of the complex and the number of hydroxides in PG, the effective acidity of PG seems to be quite weak. For this reason, the present structure analysis has been carried out in order to characterize the acidity of PG from the structural point of view. Three kinds of solvated single crystals are isolated from solution in dichloromethane, chloroform and acetonitrile. In all crystals, there observed strong OH…O intramolecular as well as intermolecular hydrogen bond network throughout the crystal. These results lead us to conclude that the formation of OH…O intramolecular hydrogen bonds weakens considerably the acidity of PG toward surroundings.

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Digital halftoning, which is a technology used to reproduce continuous-tone images approximately on physically bi-level printing devices, has been studied extensively, and several techniques, such as error diffusion, have been proposed. Previously, the size and pitch of each dot has been assumed to be equal. In the case of ink-jet printers, however, the dot position can be controlled, for example by electrostatic deflection, to a greater precision than the dot size, even though the dot size is fixed. This enables the image quality to be improved without changing the dot size, since dots can be more uniformly spaced. A number of algorithms have already been proposed in which the position of each dot is continuously variable. However, the present paper introduces another solution, in which the position of each black dot is digital, but can be controlled to a greater precision than the dot size. The algorithm is an extension of conventional error diffusion. In order to obtain better halftone images, a scalable error filter has also been proposed, in which an error filter of arbitrary size can be generated by simply supplying a parameter. Through subjective evaluation image quality was shown to be considerably improved. This is thought to be a result of the increased freedom of dot position.

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While the color printing in offices advances in recent years, the demand of to output monochrome and a color for the same printing speed has increased, and a tandem color printer has been accepted in a market. In order to urge it spread in office, a low price, installation area, realization of a low running cost, and the high quality of image as a color printer are further demanded by the user. Our company realized enhancement of high color quality of image and reduction of printing cost by new device development. Furthermore, the color tandem printer of the class smallest in the world by compact design has been developed.

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The Multi Function Peripherals, combining the functions of a copier, printer, facsimile, scanner, and filing equipment, are widely used in offices. Recently, the needs for energy saving to adapt to various environmental standards have increased. To come up to user's expectation, our company has paid its attention to the fusing system which consumes the 70% of whole system energy. We have used the Induction Heating for this system at the first time in the world. As a result, we have improved the equipment with shorter warming up time, and have saved a great energy by cutting the consumption energy on standby. Continuously, we have improved the fixing device of Induction Heating Technology by using Multi-Coils, and we have applied it to the high speed digital copier and the digital color copier. We have achieved highly energy saving to apply Multi-Coils system which enables to optimize energy consumption.

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Oil-less color toner heralded the evolution of fusing technology for color laser printers, which has since been materialized by the newly developed fuser member with minimized heat capacity. With its background technology of the monochromatic on-demand fusing, Color IH fusing technology, a top runner in the field of energy saving, realized highly efficient fusing system utilizing induction heating. Its core technology consists of (1)induction core/coil, (2)fusing sleeve, (3)high frequency power source, all of which required breakthrough works to fix a number of difficulties. As a result, a big energy reduction (ca. 70%) has been achieved as compared to conventional color fusing technology.

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In the current consumer market of the inkjet printer which is mainly based on the digital photographs, in addition to the further improvement of speed and quality of the printing, the improvement of photo image permanece is progressing quickly. Moreover, the challenge to an office market has also started by the development of a high-speed printing technologies with a plain paper. On the other hand, the application range is expanding especially an industrial inkjet field by innovation of ink technology. In this document, I'll survey some typical technologies of the latest inkjet and look around the features and the future deployment.

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GELJET Printer IPSiO G707/G505 are the latest type of inkjet printers to create business documents on plain papers in high-speed and high-quality printing as well as duplex printing, which had been considered as very difficult to be achieved. Three newly-developed GELJET technologies overcome the difficulties to exercise these perfomance. The major features of the products are as follows:
  1) Pigment ink with high viscosity and penetoration improves image quality on plain papers. (GELJET Viscus Ink)
  2) Newly-developed print-head of 1.27 inch width enables high-speed printing. (GELJET Wide Print-head)
  3) Belt transportation system utilizing electrostatic attractive force can feed papers stably in high speed with a high degree of accuracy. (GELJET BT System)

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A novel thermal type inkjet printer equipped with A4 page-wide head block has been developed. The new printer is called LineShot Printer and 4 inks based with 600dpi nozzle pitch; hence 5,120 nozzles per color or 20,480 nozzles per head are involved. An innovation employed in the LineShot printer is a technology, which controls a droplet discharge angle from each nozzle, called “Lateral Deflection Shot”, which has enabled to averaging errors in disposing droplets and help reduce micro-stripes of a picture in a one-path print system.

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In the ink-jet pigment ink (the PX-P ink) until the year before last, the gloss of the output thing was insufficient. Therefore, we developed the ink-jet pigment ink (the PX-G ink) that improved this performance. That gloss improves, by the technology that we do the surface of the drying membrane of ink-jet pigment ink evenly was found out. An author explains about the consistency of gloss and emission color first of all, with, this manuscript and explain about optimal color material paint to stand together granulation and color reappearance nature besides gloss, next.

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The principle behind inkjet technology is very simple; the firing of droplets from nozzles at a target. In recent years, ink-jet printing technology has been applied to various fields, including home and office printers, all the way to digital printers used in the industrial applications. In this paper the technical trends in inkjet printheads for industrial applications are explained. Special emphasis is directed to the shear-mode/shear wall principle and droplet formation of grayscale operation (multi-drop operation). Moreover, the interactions of droplet size with the performance are discussed.

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Recently the applications of inkjet technologies have been expanded to the industrial fields. It is important requirement that wide variety of usable inks and media can be used and that high productivity is achieved for industrial applications. A shear-mode piezo inkjet head has the most highly integrated nozzles among piezo heads which are hardly limited on the choice of usable inks. In this report the computational simulation analysis of fluid flow dynamics and drop formation process of the shear-mode piezo head are described. And features of shear-mode piezo head are introduced briefly.

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