Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
Volume 69, Issue 5
Displaying 1-9 of 9 articles from this issue
  • Hiroyuki KOBAYASHI
    2006 Volume 69 Issue 5 Pages 299-307
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
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  • Hiroo INOKUCHI
    2006 Volume 69 Issue 5 Pages 309-314
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    There are only 4 types of chemical bonding, covalent bond, ionic bond, metallic bond and molecular bond (van der Waals force). Hybridizations of each 4 bonding enable to create a diversity of chemical compounds, which number increased to nearly a hundred million now. We can select the needed characteristics from this variety of substances, that why we think chemistry is interesting.
    The breakthrough of our discovery of electrical conduction in organic solids issued from the consideration of the characteristics that both polycyclic aromatic compounds and highly electrically-conductive graphite possess many π-electrons in the compounds. We report why and how we were engaged in the study of organic semiconductors and we hope it helps leading to the discovery of new materials.
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  • Shizuo TOKITO
    2006 Volume 69 Issue 5 Pages 315-319
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    This article describes the working mechanism and the improvement in emission efficiency of organic light-emitting diodes. At first, the basic device structures and the representative organic materials are shown, and the working mechanism involving carrier injection and light emission are explained. Finally, the drastic improvement in emission efficiency using phosphorescent materials as light emitting materials is also described.
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  • Satoshi AIHARA
    2006 Volume 69 Issue 5 Pages 320-326
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    We have been studied a new type of solid state image sensor with vertically stacked structures of three organic photoconductive films which are sensitive to only red, green and blue light, with the aim of developing high-resolution compact color cameras without color separation optical systems. In this paper, we describe organic photoconductive films sensitive to each primary color component with changing organic molecules, image pickup using an organic film incorporated into a camera tube, and the operation of a CMOS readout circuit overlaid with an organic film, showing the great potentials for the development of highresolution prism-less color cameras.
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  • Toshihiro YAMANARI, Tetsuya TAIMA, Kohjiro HARA, Kazuhiro SAITO
    2006 Volume 69 Issue 5 Pages 327-331
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    Organic thin-film solar cells have attracted attention as a novel low-cost solar cell. The organic semiconductor based cells have been studied for more than 30years; however, their power conversion efficiencies have not sufficient to date. In recent years, based on the features of organic materials, a unique concept, “bulk heterojunction”, was proposed and high performance cells have been developed since then. In this article, we review the recent trends to develop highly efficient cells, especally the polymer: fullerene bulk heterojunction solar cells based on wet process, and future prospects of them.
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  • Seigo SUGIMOTO
    2006 Volume 69 Issue 5 Pages 332-334
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    EVERPLAY is a digital imaging industry initiative that will allow consumers to easily save, print, playback, and share media assets in ways that have not been accomplished easily or reliably before. EVERPLAY will define how information willbe encoded on the media so that products from all participating companies can understand the information on the media. In this report, we describe the technology overview and the aim of EVERPLAY.
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  • Dependence of the Rate of Photopolymerization on Holographic Properties
    Ken'ichi KOSEKI, Yuko MORI
    2006 Volume 69 Issue 5 Pages 335-339
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    The holographic properties of photopolymerizable composition sensitive to visible laser were investigated in relation with the rate of photopolymerization. The photopolymerizable layer consists of four components: multifunctional acrylate monomer, methacrylate monomer, organic peroxide (3, 3', 4, 4'-tetra (t-butylperoxycarbonyl) benzophenone) and sensitizing dye (3, 3'-carbonyl bis [7-(diethylamino) coumarin]). Photopolymerization profile was measured by IR spectroscopy for photopolymer film exposed to the 488nm light. The rate of photopolymerization was controlled by changing the irradiation intensity of 488nm light. Diffraction efficiency of the hologram recorded by the photopolymer was decreased with increasing thelaser intensity. The diffraction efficiency was also decreased with increasing the rate of photopolymerization. The increase of the rate of photopolymerization brings about a dense polymer network structure, accompanying an increase of the glass transition temperature. Therefore, the diffusion of monomers from the relatively unexposed areas into the exposed areas was limited. Consequently, the sample will retain a small modulation in index of refraction.
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  • Shigeharu URABE, Minoru SATOU
    2006 Volume 69 Issue 5 Pages 340-346
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    Hitherto, photographic emulsion grains have been prepared by introducing the aqueous silver ion solution and the aqueous halide solution into the gelatin protective colloid solution under the vigorous mixing. In case of mono-halide crystal such as silver bromide or silver chloride, no crystal imperfection was generatedin them, but in case of mixed crystals such as silver iodo-bromide or silver bromo-chloride, twin dislocations and edge dislocations were generated in the graingrowth period. These imperfections didn't ever appear when silver halide grains were grown by Ostwald ripening process in which silver ions and halide ions wereadded by ultra fine grains instead of aqueous solutions. Control of imperfections in mixed crystals make it possible to know about their nature and effects uponphotographic properties.
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  • Shigeru SATO, Hiroshi KOMORI, Hiroyuki KOBAYASHI
    2006 Volume 69 Issue 5 Pages 347-351
    Published: October 25, 2006
    Released on J-STAGE: February 17, 2011
    JOURNAL FREE ACCESS
    In this research, we noted the image quality of several visual media which have peculiar characteristic, and investigated their influence on the impressions of the images. From the evaluation experiment by semantic differential method (SDM), we extracted three factors, which influence on the evaluation of the images, and found that the impression of image quality differs between the young people and old people.
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