日本写真学会誌
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
40 巻, 1 号
選択された号の論文の5件中1~5を表示しています
  • 久保 走一, 秋葉 斉
    1977 年 40 巻 1 号 p. 3-6
    発行日: 1977/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    The purpose of this paper is to obtain information on the temperature dependence of the information capacity of B/W film developed by ordinary fine grain developers.
    The results of the experiments show that the light spread function of photographic layer is much improved as the temperature of development increases. The reason is considered that, at the higher temperatures, diffusion is rate controlling, the developed silver appeares in the upper portion of the emulsion layer, thus light spread function which increases along the depth of emulsion layer would be improve as the diffusion is rate controlling state.
    While, RMS granularity of the emulsion layer is deteriorated as the temperature increases. Since the information capacity is much depend upon the light spread function than distinguishable exposure levesl, the values calculated from the equation defining the information capacity are improved as the temperature of development increases.
  • 三宅 洋一, 辻内 順平
    1977 年 40 巻 1 号 p. 7-14
    発行日: 1977/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    Color informations such as congestion of a mucous membrane and a skin, complexion and blood shot eye are important factors to make a diagonosis of illness.
    This paper describes a method to make a diagonosis of periodontities by the use of color information on color film. The chromaticity values uv of reversal color film (Ektachrome-X) are introduced in order to diagonose of gums. About eighty percent of samples (fifty peopole's oral cavities) were classified correctly into two groups, normal or abnormal gums by the use of linear discrimination function.
    A computer processing of the oral cavities photographed by color film is also described.
  • 杉本 忠夫, 柳田 博明
    1977 年 40 巻 1 号 p. 15-21
    発行日: 1977/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    Exchange of bromide ions between solid and solution during aging of a silver bromide hydrosol was investigated by use of radioactive 82Br-. The exchange was found to proceed in the same way as that of silver chloride via two essential steps; the first an instantaneous surface exchange, and the second a relatively slow process due to recrystallization (Ostwald ripening). The thickness of the surface layer in equilibrium with solution was calculated to be 3.2 atmic layers. Also, drastic contact recrystallization was observed in the AgBr hydrosol. About six times as much amount of 4-hydroxy-6-methyl-1, 3, 3a, 7-tetraazaindene per unit surface for AgBr as for AgCI were necessary for stopping the recrystallization and the exchange of halide ions.
    From the relationship between the change in the degree of exchange and the change in average particle volume were clearly distinguished the mechanisms of particle growth in silver bromide hydrosols, such as Ostwald ripening, contact recrystallization, and coagulation. When Pb++ ions were added to AgBr hydrosol, the particle underwent coagulation followed by contact recrystallization, while addition of ammonia gave rise only to acceleration of Ostwald ripening. These conclusions were led from the analysis of the curves of the degree of exchange versus average particle volume. Namely, the curves for the control and the sol with ammonia entirely coincided with each other, while the curve of the sol with Pb++ was greatly separated downward from them.
  • 藤原 光人
    1977 年 40 巻 1 号 p. 22-28
    発行日: 1977/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    The current topics of couplers employed in color development are reviewed. The reacent progress of active methine or methylen group substituted couplers are described in detail. An additional description is given on the compounds which react in a similar manner as the coupler, e. g. D. I. R. compounds.
  • 1977 年 40 巻 1 号 p. 45-52
    発行日: 1977/01/31
    公開日: 2011/08/11
    ジャーナル フリー
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