NIHON GAZO GAKKAISHI (Journal of the Imaging Society of Japan)
Online ISSN : 1880-4675
Print ISSN : 1344-4425
ISSN-L : 1344-4425
Volume 57 , Issue 4
Showing 1-17 articles out of 17 articles from the selected issue
Regular Paper
  • Shigeki TAKAHASHI, Takahiro YOSHIKAWA
    2018 Volume 57 Issue 4 Pages 385-396
    Published: August 10, 2018
    Released: August 13, 2018

    The inkjet printing system has expanded its application to commercial and ledger sheets, recently labels and packages, with the advantages of broad printing, high density and continuous productivity due to the advance of line type print heads. According to this study, it was found that the ink performance including the O/W type emulsion greatly depends on the characteristics of the emulsion.

    The image quality after printing the emulsion-containing ink on paper was found to be decreased as the amount of emulsion in the ink, that is, the number of particles in the droplet was larger, or as the particle size was increased. On the other, the image quality was higher when Tg of emulsion was higher. In addition, it was found that the product of the spreading area of ink droplets indicating the interaction with paper and the glossiness was a new index for predicting image density.

    The abrasion resistance was improved when the film formability of the emulsion was good, and it was considered that the addition amount of the emulsion and the glass transition temperature were related to the film forming property. Regarding the fixing property, it was found that when the amount of emulsion was the same as or larger than that of colorant, the entanglement of the polymer landed on the paper was thought to be improved and the fixing property was enhanced.

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  • Yuji TOYOTA, Hideji MIZUTANI
    2018 Volume 57 Issue 4 Pages 397-402
    Published: August 10, 2018
    Released: August 13, 2018

    As for the beam deflector device of the laser scanning system used for laser printer and MFP, the most are polygon motors. A MEMS actuator is examined as a beam deflector to take place of polygon motor for a long time, but there are few results, and there is not a true example particularly in color printer/MFP. The increase of the spot size of the scanning domain edge where the MEMS as the beam deflector includes some problems, but faults are caused by an angular velocity turn in that by the optical system because cannot solve it, it is in a big bottleneck. We report an examination result about compensation of the spot size by the luminescence control of the laser.

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  • Riki KUDO, Motoi IWATA, Masakazu IWAMURA, Koichi KISE
    2018 Volume 57 Issue 4 Pages 403-412
    Published: August 10, 2018
    Released: August 13, 2018

    The trademark examination is a task of confirming whether there is a similar trademark within the registered trademarks. In this task, searchers narrow down the similar trademarks to be compared by using keyword search, and they make judgement visually. However, this process is labor intensive and it is unavoidable to miss some similar trademarks. In particular, visual similarity is the most fundamental which covers many cases. Thus, we consider that solving the above problem with respect to visual similarity is an important step towards full automation. The most important point is to reduce output of dissimilar trademarks while keeping similar trademarks in the output. In addition, the computational cost must be small enough. In this paper, we focus on image matching methods used for specific object recognition to fulfill the requirements. From the experimental evaluation using images and queries, we have obtained recall 100%, precision 62.5%, processing time 8.2 seconds. This indicates that the proposed method can reduce the workload of trademark examiners.

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    2018 Volume 57 Issue 4 Pages 413-421
    Published: August 10, 2018
    Released: August 13, 2018

    In inkjet printers, misregistration caused by reciprocal scanning of the head causes a great deterioration of graininess, the average image quality of the product was lowered, and it became the biggest factor to increase variations among products. In this research, we aimed to develop a new concept of halftone technology that minimizes graininess degradation due to misregistration. By finding that improving the dispersibility of both the dots formed by the forward scan and the dots formed by the backward scan makes it possible to greatly suppress the graininess deterioration due to misregistration, successfully developed halftone technology with little graininess deterioration and excellent robustness. In addition, it was shown that by improving the dot dispersibility for each head scan, it is possible to reduce bleeding of the ink and suppress bleeding unevenness caused by high speed printing.

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Rapid Communication
  • Kazuhiko IMANO
    2018 Volume 57 Issue 4 Pages 422-425
    Published: August 10, 2018
    Released: August 13, 2018

    Constant voltage excitation and its selection of voltage waveform and optical method are introduced into the imaging system for evaluating the thin sample such as electronic device. Information of surface vibration velocity on the piezoelectric transducer and sample are effectively used. Rectangular pulse having the time width of resonance period of transducer was adopted to cancel the mechanical ringing. Exciting efficiency of transducer was improved by lager than 20 dB compared to our previous study. Imaging for the thin brass plate with etched “3” character is clearly imaged using time difference mode. As the result of experiment, possibilities as a tool for evaluating the thin plate like solid sample around several tens of μm such as electronic devices are revealed.

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Feature articles on the 60th Anniversary of ISJ's establishment
Imaging Today
  • Jun HITOSUGI, Tadashi OGAWA, Tetsuya OHFUCHI, Kentaro MIKUNIYA, Yuuki ...
    2018 Volume 57 Issue 4 Pages 439-444
    Published: August 10, 2018
    Released: August 13, 2018

    RICOH Pro C7210S/C7200S inherits Pro C7110S/C7100S strengthening the lineup of Ricoh's production printers. It is a digital full-color printer that responds to a wide variety of POD market needs including multifarious, small lot, short delivery time, variegate printing paper and expressive power by decorative effect. The main features are as follows.

    1) High productivity : 95ppm (C7210S) /85ppm (C7200S) for both color and monochrome.

    2) High image quality stabilization : Main / sub scanning density deviation correction technology.

    3) Image position accuracy : Real time registration by IQCT, mechanical registration adjustment.

    4) High-value-added Printing : Special Color Lineup, Installing White Toner Printing Mechanism

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  • Masaru HIBINO, Mitsuhiro OTA
    2018 Volume 57 Issue 4 Pages 445-449
    Published: August 10, 2018
    Released: August 13, 2018

    The imagePRESS C10000VP is the digital production printing system of the dry process electronograph method with 100 pages per minute (A4 conversion) print speed, released in 2015.

    We have improved not only image quality, productivity, reliability enough for POD (Print on Demand) market requirement, but also wide range paper handling and total productivity of customer workflows, since imagePRESS C7000VP was provided into the market in 2007

    In this report, we introduce both the general explanation of the product and the advanced key technology of image quality and performance enhancements.

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  • Masaru TAKAHASHI, Shuji SATO, Akihiro IIZUKA
    2018 Volume 57 Issue 4 Pages 450-455
    Published: August 10, 2018
    Released: August 13, 2018

    In recent years, metallic printing that can reflect light has been growing in popularity for its versatility and ability to create a dramatic impression, and it is used for various purposes in the printing industry such as for printing greeting cards, book covers, labels, and packages. At Fuji Xerox, we have made it possible to use a reflective metallic pigment by adapting the conventional emulsion aggregation (EA) method used to produce toner, thereby succeeding in developing gold and silver toner that is capable of the energy-efficient, low-temperature fusing achievable with EA-Eco toner while having a high sheen.

    With the conventional pulverization method, it was only possible to produce unevenly shaped toner particles whose reflective pigment particles were not oriented consistently. Also, the conventional toner particles had pigment particles that were not completely contained within the toner particles and protruded outside, resulting in image defects due to insufficient charging and transfer defects from electricity leakage caused by the protruding pigment. Therefore, it was difficult for this toner to be used with the xerographic system. To address this, Fuji Xerox utilized and adapted the EA method to orient the flat reflective pigment particles in the same direction, thereby developing an ellipsoid-shaped toner particle that can fully contain the pigment particles. This new method allows the toner to meet both the basic performance requirements for toner as well as the performance requirements for metallic printing. In this way, this toner can be used with the xerographic system.

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  • Toshiyuki MIZUTANI, Kenichirou HIRAMOTO, Toshiyuki TAKABAYASHI, Toyoak ...
    2018 Volume 57 Issue 4 Pages 456-461
    Published: August 10, 2018
    Released: August 13, 2018

    Recently commercial printing market has changed, because of expansion of IT technologies and consciousness of environment. In order to enter into the commercial printing market, we have developed a digital inkjet press Accuriojet KM-1 which can meet these market demands.

    We defined 5 points to be achieved in the commercial printing market.

    1. Paper transportation stability as same as offset

    2. Printing media range as wide as the offset

    3. Connectable to existing finishing devices

    4. High productivity as high as the offset

    5. High image quality and high reliability as excellent as the offset

    At this technology report, we are going to explain about UV curable inkjet ink and image processing technologies for forming high-quality image with high productivity.

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  • Takamasa ITO
    2018 Volume 57 Issue 4 Pages 462-469
    Published: August 10, 2018
    Released: August 13, 2018

    The rapid progress of the IJ printing technology achieved high image quality and increased printing speed. Accordingly, the quality required for the IJ photo paper has also changed. In recent years, the trend of product development of our IJ photo paper is roughly classified into two categories. The first is “product development” aiming to improve the primary quality such as ink absorption and optical density in order to keep up with the advances in printer technology. The second is “product development” to obtain features that haven't existed before. There is a high demand for IJ photo paper that can precisely reproduce the expressive and creative images among photographers and creators. In order to reproduce the softness, tone, depth and smoothness of the photo, we aim to develop the IJ photo paper with features, that appeal to the human senses such as the touch and texture. In this paper, we introduce our primary quality and the distinctive products developed by our company.

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Imaging Highlight
Lectures in Science