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Volume 39 (1976)
- Issue 6 Pages 337-
- Issue 5 Pages 261-
- Issue 4 Pages 194-
- Issue 3 Pages 123-
- Issue 2 Pages 73-
- Issue 1 Pages 5-
Volume 39, Issue 5
Displaying 1-6 of 6 articles from this issue
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Eiichi MIZUKI1976 Volume 39 Issue 5 Pages 261-281
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA world progress report of photographic science and technology. Subjects are selected from reports and news in foreign periodicals issued in this period. Items are as follows: A) general view, silver halide photographic materials, color photography, electrophotography, non-silver sensitive materials, B) theory of the latent image, theory of development, image quality and color reproduction, C) photographic processing, D) motion picture, graphic arts, radiography, E) photographic systems including camera, lenses, light sources and image recording.View full abstractDownload PDF (3404K) -
Eiichi INOUE, Kouichi CHATANI1976 Volume 39 Issue 5 Pages 282-288
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe imaging process using Ag-chalcogenide glass sensor consists of two image conversion processes as “ conversion 1”-from a light energy image to a photo-doped Ag image-and “ 2”-from the photodoped Ag image to the optical image-. The imaging characteristics of the sensor are mainly varied by some effective factors on “conversion 1 ”, since the density of doped Ag can be linerly related to the optical density image (optical density) in “ conversion 2”.
The effective light absorption efficiency, the quantum yield and the successive diffusion rate of silver into the glasses are important factors in the photo-doping process. The quantum yield of -0.5 was obtained for Ag-As2S3 sensor in the initial photo-doping step. The amount of doped Ag was roughly proportional to the exposed light energy and was independent on the intensity of light.
After the Ag layer of more than 80 Å thick was photo-doped into the glasses, it was found that the rate of the successive photo-doping depended upon the diffusion process of the doped Ag and the optical absorption change.
The effective light absorption of Ag doping at the initial stage was estimated to occur in the chalcogenides of about 260 Å at the interface.A roughly linear relationship was observed in the D-E curves for Ag-chalcogenide sensors.View full abstractDownload PDF (804K) -
Takao ABE, Mitsunori SUKIGARA, Kenichi HONDA1976 Volume 39 Issue 5 Pages 289-294
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe effect of allylthiourea on the spectral sensitization of silver chloride in the electrochemical system has been studied. The following electrochemical cell was constructed with a thin crystal of silver chloride: Pt (I)/electrolyte (I), dye/AgCl/electrolyte (II)/Pt (II). When allylthiourea was added into the electrolyte solution (I) containing 1, 1'-diethyl-2, 2'-quinocyanine chloride as a spectral sensitizer, the sensitized photocurrent by the dye decreased, whereas in the case of the addition of allylthiourea into the electrolyte solution (II), the sensitized photocurrent increased. These phenomena were interpreted in terms of the formation of silver sulfide, which was expected to introduce a deep electron trap, on the surface of the silver chloride crystal.View full abstractDownload PDF (740K) -
Reduction of Unexposed Silver Helide GrainsHiroshi HAMANO1976 Volume 39 Issue 5 Pages 295-301
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe growth and the decay of latent-image specks Agn+ in redox buffers are discussed, based on the assumption that the specific rates of growth and decay of Agn+ are proportional to the distribution of electrons in the lowest unoccupied level of Agn+ and to the distribution of electron vacancies in the highest occupied level of Agn+, respectively. The mechanisms of the reduction of unexposed silver halide grains and of the development are also suggested.
Conclusion;(1) The larger specks than a certain size cannot be distinguished clearly from others by the redox buffer.(2) “ The redox potential of the latent-image” is not same in nature as the thermodynamically defined potential, but its nature approaches to the thermodynamical one with increase of the size of the speck.(3) It is barely possible to obtain approximate values of quasi-Fermi levels of the specks by the measurements using the redox buffers, but the discrete level of the small specks could not be found by refinements in technique.(4) Ag+ at kink site cannot decay and has an only probability to grow to Ag2+, and a metallic silver is most stable in the redox buffer. These lead to further growth to Ag3+, Ag4+, Ag5+ and so on. Therefore, if the redox potential of a reducing solution is more negative than the silver potential in the same solution, the pure, unexposed silver halide grains can be reduced to metallic silvers.(5) The lowest unoccupied levels of Ag+ (kink), Ag2+ and Ag3+ lie so high from Fermi level of the developer that their rates of growth are very slow. Once the speck grow up to provide an unoccupied level as high as Fermi level of the developer, the speck can grow very rapidly. Latent-image speck provides such level on the surface of the silver halide grain.View full abstractDownload PDF (856K) -
[in Japanese], [in Japanese]1976 Volume 39 Issue 5 Pages 302-307
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (741K) -
1976 Volume 39 Issue 5 Pages 308-315
Published: September 25, 1976
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (1121K)
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