Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
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Volume 54, Issue 5
Displaying 1-9 of 9 articles from this issue
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  • Trends in the Multimedia Imaging Systems towards the 21st Century (Part 2)
    Eiichi MIZUKI
    1991 Volume 54 Issue 5 Pages 548-554
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.548
    JOURNAL FREE ACCESS
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  • Effects of Toner Size and Toner Surface-Charge Density on the Quality of Electrophotographic Images
    Satoshi TAKAHASHI, Nobuaki KOBAYASHI, Toshinori YAMAZAKI
    1991 Volume 54 Issue 5 Pages 555-562
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.555
    JOURNAL FREE ACCESS
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    Effects of tener size (d50) and toner surface-charge density (q/st) on electrophotographic imagequality factors (i.e. image density for solid area, resolution of line images and reproduction of dot images) have been analyzed by varying the toner surface-area median size (d50) from 6.8 to 13.5 μm and the carrier surface-area median size (D50) from 43 to 106 μm in two-component development systems employing the toner and the insulative carrier.
    As regards the optical density of toner image for solid area, development efficiency is determined by the toner surface-charge density (q/st), independently of the toner size (d50) and the carrier size (D50), not by the toner charge-to-mass ratio (q/m) as suggested by Schein and by others. As regards the resolution of line images produced in the rotating direction of the photoreceptor drum, the width of a line broadens by four particles of the toner, ΔΓ=4·d50. The resultant resolution for lines is determined by the reciprocal of the broadening width (ΔΓ).
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  • 3D Recovery of the Object with Plane Symmetry from Single View Image
    Kazuhiko OHNUMA, Hironobu KITAOKA, Yoshizumi YASUDA, XIUWAI Zhao, Yasu ...
    1991 Volume 54 Issue 5 Pages 563-568
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.563
    JOURNAL FREE ACCESS
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    A new method that can recover 3D information of an object with plane symmetry from single view image is shown here. This method is available for perspective images; camera images and sketches. From the perspective relation of an image and symmetric points, 2 or 3 vanishing points, camera position, and symmetric plane are derived. And the 3D positions of all the symmetric points are decided by using the geometrical relation of the vanishing points, the camera position and the symmetrical plane. Here, the process for hiden points is also shown.
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  • Inorganic Particles Related with Imaging Materials
    Yoshiro YONEZAWA, Seiichi SUMI
    1991 Volume 54 Issue 5 Pages 569
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.569
    JOURNAL FREE ACCESS
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  • Fine Particles of Silver Halides
    Toshio TANAKA
    1991 Volume 54 Issue 5 Pages 570-579
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.570
    JOURNAL FREE ACCESS
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    A review is made of recent studies on the quantum size effects and the kinetics of formation of silver halide fine particles, as well as on the growth and characterization of photographic emulsion. grains. The stopped-flow and the multichannel spectrophotometry are powerful tools for in-situ observation of size-and time-dependent optical properties of silver halide particles. Works of the present author in this field are summarized, and some new developments by other researchers are introduced. The least soluble silver iodide exhibits the most remarkable quantum size effect. Silver halide particle formation is a multistage process, the initial ionic reaction being the fastest and followed by primary aggregation of ion pairs or complex ions. Interests of photographic emulsion scientists are presently focussed on enhanced understanding of the structure and growth mechanism of tabular twin grains, in the hope to better control their growth and prepare photographic emulsions of higher performance.
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  • Photochemical Properties of Semiconductor Microcrystals
    Hiroshi YONEYAMA, Hiroyuki UCHIDA
    1991 Volume 54 Issue 5 Pages 580-587
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.580
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    Quantum-size effects that arise from the confinement of charge carriers in semiconductor microcrystals have gained popularities in recent years from the viewpoints of fundamental science and potential applications. Nanometer-sized crystallites that contain only about ten to several thousand molecules eNhibit unique properties which are intermediates between the molecules and bulk crystals. The preparation, characterization and unique properties of the microcrystals are reviewed in this paper. The high photocatalytic activities of some microcrystalline semiconductors are discussed in terms of difference in energy diagrams and their surface conditions. Several topics including synthesis of IIIV microcrystals, preparation of mono-dispersed particles and application of semiconductor microcrystals to novel optical devices are also described.
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  • Physical Chemistry of Ultrasmall Particles of Semiconductor and Silver
    Yoshio NOSAKA
    1991 Volume 54 Issue 5 Pages 588-595
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.588
    JOURNAL FREE ACCESS
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    Recent literatures concerning theoretical investigations for electronic states of ultrasmall semiconductor particles and experimental kinetic studies for the trapping and transfer of photoinduced charges are reviewed. The kinetic studies involve electron transfer from irradiated ultrasmall semiconductor powders to adsorbed molecules and that from excited dye to semiconductor powders. Radiationchemical investigations for silver clusters are also reviewed.
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  • Magnetic Particles and its Dispersion Properties
    Masataka OZAKI
    1991 Volume 54 Issue 5 Pages 596-605
    Published: October 28, 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.596
    JOURNAL FREE ACCESS
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    Particulate materials are still mainly employed for magnetic recording materials. In the past twenty years, efforts were successfully made for the improvements of the magnetic properties of the particles. The particles were improved with the demands for higher recording densities having high credibility for video recordings and computer memeries. The magnetic materials used are mainly iron oxide particles or iron oxide particles modified by cobalt ferrite with small amounts of metal films. Recently much interests are towards perpendicular recordings for achieving higher recording densities using plate-like barium ferrite particles.
    It is shown that the dispersion phenomena of magnetic particles can well be demonstrated by using weakly magnetized coarse hematite particles dispersed in aqueous solutions.
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  • Erratum to : The Proceedings of KIKUCHI SYPOSIUM (Part II)
    1991 Volume 54 Issue 5 Pages 619
    Published: 1991
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.54.5_619
    JOURNAL FREE ACCESS
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