NIHON GAZO GAKKAISHI (Journal of the Imaging Society of Japan)
Online ISSN : 1880-4675
Print ISSN : 1344-4425
ISSN-L : 1344-4425
Volume 45, Issue 5
Displaying 1-8 of 8 articles from this issue
Original Papers
  • Takahiro WATANABE
    2006 Volume 45 Issue 5 Pages 424-428
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    A new particle simulator to analyze the behavior of carrier beads around a magnet roll in a two-component developer unit in electrophotography has been developed. The simulator, which is based on Discrete Element Method, including the magnetic interaction force among particles in a magnetic field, adopts parallel processing with MPI and/or OpenMP. Parallel processing of the particle simulator with several processors provides excellent performance to simulate the behavior of a realistic amount of particles in a practical time. The simulation results obtained for tens of thousands of carrier beads reveals not only realistic particle behavior around a magnet roll but also the quantitative relation between the stress on the carrier and the amount of carrier beads that passes through a gap between the doctor blade and the magnet roll. These are very important parameters to obtain high-quality images in a two-component developer unit.
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  • Takashi NAKAMURA, Daigorou OOKUBO, Tetsuya KAWAKAMI, Masamitsu SASAHAR ...
    2006 Volume 45 Issue 5 Pages 429-432
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    We developed a new DC plasma CVD layer deposition process for a-Si photoreceptor drums instead of the ordinary high f-requency 13.56 MHz plasma process. This has made the layer deposition process speed 2 times faster, minimized by-produ-ct powder generation and improved the surface smoothness of the a-Si drum. Through these improvements, we realized pro-duction cost reduction. This makes it easier to offer smalldiameter a-Si drums for tandem color printers, where growth in demand is predicted.
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Imaging Today
  • Takashi DENO
    2006 Volume 45 Issue 5 Pages 434-443
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Micronized organic pigments have attracted much interest in wide range of applications in recent years. In order to get the optimum performance of the micronized pigments in the application, it is necessary to disperse the pigments down to primary particles and to stabilize the resultant dispersions. This article presents an outline of micronization and surface treatment of organic pigments as well as the latest technology in making stable dispersions of the micronized pigments.
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  • Hiroko HAYASHI
    2006 Volume 45 Issue 5 Pages 444-450
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Significant improvements in inkjet print quality have been attained in no small part due to micro-droplet-based low granularity, advanced image processing algorithms, ink-matched print media, and through a better understanding of the ink droplet spreading mechanisms. As a result, photo-quality inkjet prints fully comparable with silver-halide prints have been achieved. Nevertheless, there remain areas for further improvement, especially in regard to the durability of prints obtained from dye-based inks. Our general approach for obtaining remarkable improvements in print durability has been focused on pigment-based inks. Although falling short of complete satisfaction, through improvements in pigments, dispersants, and ink formulations, an overall high level of market acceptance and consumer satisfaction for pigment-based inks has been achieved. For high quality output focused on plain-paper media, the PX-V ink has been developed. For photo quality output on glossy specialty media, the PX-G and PX-P/K3 inks have been developed. Depending on the user, be it the general consumer, the high-level amateur, or the professional, there is a pigment-based ink that meets their special needs.
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  • Takehiro TSUTSUMI
    2006 Volume 45 Issue 5 Pages 451-456
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Dye based ink is widely used for inkjet application, but suffers low durability and slow color stability. Recently pigmented inkjet ink is very interested in for print durability and high optical density. To apply the pigment dispersion for inkjet ink, many physical requirements has to be managed. Comparing several types of pigment dispersion, the encapsulated pigment is thought suitable for inkjet application. In this document the performance of encapsulated pigment are described comparing with other type of pigment dispersions.
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  • Jin MIZUGUCHI
    2006 Volume 45 Issue 5 Pages 457-465
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Hydrogen gas sensor utilizing a high proton affinity of 1, 4-diketo-3, 6-bis-(4'-pyridyl)-pyrrolo-[3, 4-c]-pyrrole known as a red pigment has been reviewed. The present sensor is derived from an originally proton sensor (i.e. acid sensor) based upon the proton acceptor of the pyridyl ring in view of the advent of the fuel cell in the near future. Special attention has been paid to the correlation between H2 sensitivity and crystal structure. The sensor is characterized by a high H2 sensitivity, reversible operation at room temperature and scarcely influenced by ambient gases, such as CO, CO2, NO, CH4, SO2, CH3OH, C2H5 OH as well as water moisture. Similar H2 sensors based upon dipyridylperylene-imides or tetrapyridylcopperphthalocyanine have also been presented.
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  • Tomoji OHISHI
    2006 Volume 45 Issue 5 Pages 466-470
    Published: 2006
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Organic-inorganic hybrid flexible substrate and formation method of color filter by ink-jet printing (IJP) using latent pigment ink have been investigated for flexible displays. Organic-inorganic hybrid flexible substrate, which consists of ultra thin glass and organic film, has flexibility, high-strength and good gas barrier. Color filters were formed on the flexible substrate by IJP using solvent-soluble trichromatic latent pigment ink. Color filter patterning and color mixture are possible by this simple method. The color filter has good transparency and flexibility.
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Lectures in Science
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