Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
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Showing 1-10 articles out of 10 articles from the selected issue
Special Topics: Image Stability
Exposition
Original Paper
  • Ken’ichi Kuge, Takahiro Adachi, Hidetaka Tomimatsu
    2018 Volume 81 Issue 1 Pages 41-47
    Published: 2018
    Released: March 01, 2019
    JOURNALS FREE ACCESS

    Effects of silver-halide base to the preparation of gold nanoparticles by gold-deposition development were analyzed by postfixation development on lonely latent image specks after the removal of silver halide or carbon-replica observation of silver-halide grains with depositing gold particles. Results of the postfixation development suggested that the acceleration of development rate by addition of ascorbic acid (AA) in the developer was due to the direct reduction of Au (I) ions by AA. Gold particles formed on silver halide surface at high concentration of AA had many fine protrusions, and participation of silver filaments formed by reduction of silver halide with AA was suggested. This acceleration by AA was more remarkable on octahedral grains than on cubic grains, and was due to the difference of latent image formation process. Effects of the crystal faces on silver-halide grain to the gold-deposition development process itself were not so significant.

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  • Tomoaki Imamura, Hideyuki Nakano
    2018 Volume 81 Issue 1 Pages 48-52
    Published: 2018
    Released: March 01, 2019
    JOURNALS FREE ACCESS

    It is known to be the optimum caliber for a pinhole camera. In this study, first, the existence of the optimum caliber was verified using digital pinhole cameras. Next, the relationship between the focus length and the resolving power was experimentally clarified. In addition, a pinhole camera with more than 4m of projection distance was developed to take a picture of the lunar craters, and we actually succeeded in filming the craters.

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  • Tadaaki Tani, Tatsuhiro Naka
    2018 Volume 81 Issue 1 Pages 53-64
    Published: 2018
    Released: March 01, 2019
    JOURNALS FREE ACCESS

    The enhancement of the efficiency of latent image formation is essentially important for high-speed silver halide (AgX) emulsions including current nuclear emulsions. However, it is necessary to depress the efficiency of latent image formation for the detection of dark matters (DMs), since DMs create as many as 〜1000 electron-hole pairs/ grain with diameter of 〜40 nm. For this purpose, the guiding principles for the nuclear emulsion to detect DMs have been proposed by applying to it for the first time the concept of the detective quantum efficiency with three requisites (efficiency of latent image formation, gradation, and noise). Some experimental results of the examination of the proposed guiding principles are described for the present by use of nuclear emulsions with 〜40 nm AgX grains.

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  • Hitoshi Yajima, Maiko Sasaki, Keiko Takahashi, Kazuyuki Hiraoka, Masat ...
    2018 Volume 81 Issue 1 Pages 65-69
    Published: 2018
    Released: March 01, 2019
    JOURNALS FREE ACCESS

    Safflower red pigment was extracted from a dried flower cake “BENIMOCHI” produced in Yamagata Prefecture by a traditional method. Green metallic luster was observed from the pigment film immobilized on the black base. A reflection maximum around the wavelength of 550 nm was found on the measured spectrum, which corresponded to a green color. There was no angle dependence on the wavelength for the reflection maximum. It was found that the metallic luster occured at the air/film or glass/film interface, and contained poor linearly polarized components. Therefore, these results suggested that the green metallic luster is similar to the reflection of real metallic materials.

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