Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
Volume 43, Issue 3
Displaying 1-5 of 5 articles from this issue
  • Masao INUI
    1980 Volume 43 Issue 3 Pages 157-162
    Published: June 20, 1980
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    An abridged method for calculating the detective quantum efficiency (DQE) by using mathematical models was developed. The mathematical models which employed in this study express (1) the photographic characteristic curve, (2) the relationship between diffuse and specular densities, and (3) the relationship between diffuse density and corresponding diffuse root-mean spuare granularity.
    In this paper mathematical bases of this abridged method and application of the method to calculate DQE on a black-and-white negative film are described. The numerical values of parameters which are used in the mathematical models were obtained by experimental work. The numerical values of DQE were calculated by using the mathematical models.
    It is proved that the method has an advantage in obtaining DQE, especially in maximum, of photographic material without a tedious and time-consuming procedure.
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  • Shinichi KIKUCHI, Masanobu OGUCHI, Toshio MIYAGAWA, Hiroshi TABE, Masa ...
    1980 Volume 43 Issue 3 Pages 163-168
    Published: June 20, 1980
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    The authors investigated on determining sensitivity of phototypesetting films and papers, based on the exposure condition which the line-width of character could be correctly reproduced under.
    The line-width is faithfully reproduced under the following conditions;
    Film: The exposure to cause 2.0+ΔD density units.
    Paper: Three times exposure to cause 0.7+ΔD density units.(ΔD is fog-plus-base density)
    Finally, the authors propose to determine the sensitivity as follows;
    Film: Sf=100/E (E: lux·Esec at D=2.0+ΔD)
    Paper: Sp=100/3E (E: lux·Esec at D=0.7+ΔD)
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  • Takashi SHIRAKAWA
    1980 Volume 43 Issue 3 Pages 169-179
    Published: June 20, 1980
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    In relation to the electron beam recording (EBR) of television films, the free radical sensitive materials, which consist of polyhalogen compounds and arylamines, were studied.
    The experimental results indicate the sensitivity of 10-7c/cm2 on electrons. But this is still insufficient for EBR.
    The optical development process, whereby red-light uniformly irradiates on the sensitive film after the image exposure, was applied to the composition of leuco malachite green (LMG)/carbon tetrabromide (CTB) system. Consequently, the sensitivity of 10-10c/cm2 was obtained, which was nearly 1, 000 times as high.
    Based on this result, a 16 mm film was test-produced and electron beam TV recording was done on it, and it was found that the film was capable of being recorded at TV-rate. This, in fact, was done for the first time with non-silver salts.
    However, this LMG/CTB system does not match well with the blue light of flying spot scanning reproduction because of its being of green color. And also, in the optical development, since the sensitive materials showing other colors must be irradiated with light of shorter wavelength than red, the fog is caused in the non-image areas. This is the essential difficulty.
    As a result of the studies we have succeeded, by using fluoran compounds as a color former, in sensitizing the materials that show red-violet and various other colors by approximately 1, 000 times as much.
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  • Effect of the Potassium Iodide and 1-Phenyl-5-mercaptotetrazole upon the Development Rate and its Dependence on Complexing Agents
    Hiroyuki KOBAYASHI, Akira SASAI, Shinya MIZUSAWA, Nobuo MII
    1980 Volume 43 Issue 3 Pages 180-183
    Published: June 20, 1980
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    In order to explain the role of the adsorption of complexing agents, silver complexes and developing agents on the silver nucleus, the effect of potassium iodide and 1-phenyl-5-mercaptotetrazole (PMT) upon the development rate of two different physical developers, which include thiocyanate and thiosulfate as complexing agents respectively, was investigated. Potassium iodide and PMT are known to be adsorbed on the silver nucleus under the formation of insoluble silver salts. N-2-(4-amino-N-ethyl-m-toluidino) ethyl-methanesulfonamide sesquisulf ate hydrate (Kodak CD-3), N-methyl-p-aminophenol hemisulfate (Metol) and hydroquinone were used as developing agents. The following results were observed: The effect of potassium iodide was largely dependent on the complexing agents. The developer including thiosulfate showed a very long induction period, especially in the hydroquinone developer. Potassium iodide accelerated the development in this period to reach the rate in the developer including thiocyanate. The development rate in the thiocyanate developer was hardly affected by the addition of potassium iodide. The mechanism f or this acceleration could be ref ered to the competitive adsorption of iodide with thiosulfate, which is restraining the development, on the surface of the silver nucleus. Iodide could be adsorbed more stronger than thiosulfate, removing it from that surface. The addition of PMT restrained not only the development of the thiosulfate developer but also that of the thiocyanate developer.
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  • 1980 Volume 43 Issue 3 Pages 193-200
    Published: June 20, 1980
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
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