日本写真学会誌
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
35 巻, 5 号
選択された号の論文の5件中1~5を表示しています
  • 藤沢 信
    1972 年 35 巻 5 号 p. 255-271
    発行日: 1972/09/30
    公開日: 2011/08/11
    ジャーナル フリー
    A review on the progress of photography in foreign countries in the year 1971. Scientific and technical subjects are selected from publications in 1971 covering the following fields: general view, cameras, lenses and accesories, light sources, silver halide sensitive materials, non silver sensitive materials, color photography, photographic sensitivity, processing, sensitometry, motion picture, scientific photography and graphic arts.
  • 谷 忠昭
    1972 年 35 巻 5 号 p. 272-278
    発行日: 1972/09/30
    公開日: 2011/08/11
    ジャーナル フリー
    Cations of Cu, Pb and Cd were added to tabular AgBr emulsions when the emulsions were coated. Although Pb++ and Cd++ did not show significant desensitization, Cu++ and Cu+ caused considerable decrease of both surface and internal speeds of the emulsions. Since the desensitization caused by Cu++ was in competition with that caused by phenosafranine which is known to act as electron trape, it has been suggested that Cu++ also act as electron traps at the grain surface. It has been suggested that the desensitization observed when Cu+ was added to the emulsions result from the formation of Cu++ as a result of oxidation of Cu+ in the emulsions. By introducing Cu++ to the emulsions before or after exposure by bathing the coated emulsions in Cu++ solutions, it has been found that the desensitization caused by Cu++ arises from its retardations of both development and latent image formation. The action of Cu++ as electron traps is supported by the fact that the redox potential of Cu++ is the most positive among Cu++, Cd++ and Pb++.
  • SCN--S2O-3-系定着剤の組成の変化による現像過程の相違
    三位 信夫, 笹井 明, 武藤 義一
    1972 年 35 巻 5 号 p. 279-287
    発行日: 1972/09/30
    公開日: 2011/08/11
    ジャーナル フリー
    Effects of the composition variations of thiocyanate and thiosulfate as fixing agents in a P-Q monobath on the development curve and the distribution of image in depth were investigated.
    At the same mixing ratio or the same thiocyanate content, when the total concentration of fixing agents was raised to increase the rate of fixing, the initiation and the rate of development were slow down and the period of silver growth was reduced. From the observation of cross sections of processed films, nothing image developed at the top of the emulsion layer from the monobath process, and this phenomenon apeared more remarkably when the total concentration of fixing agents was increased.
    When thiocyanate was added from 0 to 0.5 mole/l in the thiosulfate-monobath (thiosulfate content was 0.2 mole/l), an increase in added thiocyanate led to a shorter period of silver growth, but the initiation of development was unchanged and the rate of development was increased in spite of an increase in the rate of fixing. There were little difference between cross sections from the variation of added thiocyanate.
    In view of above facts, it can be presumed that fixing agents in a monobath react with exposed grains faster than developing agents, and that thiocyanate acts not only as a fixing agent, but also as an effective accelerator for both the direct and solution-physical development. Effects of the composition variations of fixing agents on the mechanism of development and fixation in the monobath process are discussed.
  • 田中 秀明
    1972 年 35 巻 5 号 p. 288-292
    発行日: 1972/09/30
    公開日: 2011/08/11
    ジャーナル フリー
    Polyvinylesters of p-methoxy α-cyano cinnamic acid and p-azide α-cyano cinnamic acid were synthesized and their photosensitivities were investigated.
    Introduction of cyano group, an electron accepter, lowers the energy level of intramolecular charge transfer band of these molecules in cooperation with electro donating groups at para position of the benzene ring. Although the wavelength of the absorption maximum is shifted to longer wavelength at ca 340mμ, their photosensitivities are smaller than the corresponding cinnamic acid derivatives having no substitution at α position. Photosesitivity of polyvinylester of α-methyl cinnamic acid is also smaller than poly (vinyl cinnamate). Spectral sensitization of these photosensitive polymers by the usual triplet sensitizers seemed to be inefficient.
    Stuart models of these α substituted cinnamic acid derivatives reveal that these molecules are not Plliketrans cinnamic acid, but twisted. The molecular twisting will cause the low photosensitivities of these photosensitive polymers in spite of the fact that they have absorption band in longer wavelength.
  • 水平 敏知
    1972 年 35 巻 5 号 p. 293-318
    発行日: 1972/09/30
    公開日: 2011/08/11
    ジャーナル フリー
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