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Volume 42 (1979)
- Issue 6 Pages 339-
- Issue 5 Pages 309-
- Issue 4 Pages 227-
- Issue 3 Pages 161-
- Issue 2 Pages 91-
- Issue 1 Pages 5-
Volume 42, Issue 4
Displaying 1-6 of 6 articles from this issue
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Eiichi MIZUKI1979 Volume 42 Issue 4 Pages 227-245
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA world progress report of photographic science and technology in 1978. Articles are selected from scientific reports and news items in journals and periodical publications of the world in 1978.Items are as follows: A) general view, silver halide photographic materials, color photography, electrophotography, non-silver photographic materials, B) photographic theory, image quality and color reproduction, C) photographic processing and image processing, D) applications of photography including motion picture, graphic arts and radiography, E) photographic systems including cameras and new imaging systems.View full abstractDownload PDF (3068K) -
On Photoprimary ProcessTakuji MIWA, Masaru Koizumi, Hidesaburo GENDA1979 Volume 42 Issue 4 Pages 246-256
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn order to elucidate the photoprimary process of photochemical reaction of free radical photosensitive materials, the following investigations are made on N-phenyl-1-naphthylamine, diphenylaminetetrabromomethane, tribromomethane, dibromomethane systems by flash photolytic technique and fluoroandphosphori-metry; 1) the effect of dissolved oxygen on the fluorescence, phosphorescence and cationradical of the amine, 2) the relationship between the yield of the amine cation radical and the concentration of bromoalkane, 3) the relationship between the yield of the cation radical and the light intensity of flash, 4) the quenching effect of bromoalkane on the fluorescence of N-phenyl-l-naphthylamine, 5) etc. According to the results of these investigations, it is confirmed that the cation radicals are made by one photon process and from excited singlet species. Also it is concluded that the photoprimary process is exciplex formation between excited singlet state aromatic amine and ground state halogenated compound, charge separation in the complex and dissociation to amine cation radical and anion radical of halogenated compound.View full abstractDownload PDF (1260K) -
Dark Fading TestTeruaki HISANAGA, Etsuo FUJII, Toshio MIYAGAWA, Kazuo ISHIKAWA1979 Volume 42 Issue 4 Pages 257-262
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAn accelerated test method for evaluating image stability of color photographic paper was described, and estimation of fading rate of color image was discussed.
Yellow, magenta and cyan patches having densities of 0.5, 1.0 and 1.5 respectively were prepared, and were storaged at 50°-80°C-75% R.H. in an incubator. The degree of fading refers to the time required for say 10% change in each color density. The lifetime of image was estimated approximately by the extrapolation from Arrhenius Plot for the time taken for dye image to fade by 10% at 13°C and 75% R.H.(yearly mean in Japan).
From the experimental results, it was clarified that the temperature above 50°C was necessary for the accelerated dark fading test, and that the relation between logarithmic fading rate and inverse temperature (1/K) showed linearity up to 80°C (353 K). The lifetime of cyan dye image having 1.0 in the initial density was estimated as 10-20 years by Arrhenius Plot.
In the fading test, the lifetime of cyan dye image was estimated more accurately than the others, because of large temperature-dependence and less affection by yellow stain.
Although the ANSI Standard specifies 60°C (140°F) at 70% R.H. as testing condition, higher temperature than 70°C at 75% R.H. is preferable to obtain 10% fading within 1 or 2 weeks for cyan patches prepared with today's paper products.View full abstractDownload PDF (745K) -
Some New Forms (Dendrite) of Developed SilverHiroshi HARA1979 Volume 42 Issue 4 Pages 263-274
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSSome new forms of developed silver known as Dendrite were discovered in some electron micrographs, when a study of the characteristics of radiography with an electron microscope was carried out.
The production of the dendrite, to which emulsion types of photographic films and development conditions have no relation, is affected by only the sorts and energies of nuclear radiations. The production is more frequent in the cases of radiations with higher energy and incident particles with larger mass, and the growth of dendrite begins suddenly and ceases instantaneously in the initial stage of development.
Developed silver of dendrite form is originated from the mammoth development centers and the origination is due to the radiation damage in the silver halide crystals.View full abstractDownload PDF (31275K) -
Objective Tone Reproduction CurvesMasao INUI1979 Volume 42 Issue 4 Pages 275-280
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIn the usual manner objective tone reproduction curves are obtained graphically from flare curves, photographic characteristic curves of negative films and photographic papers. The author attempted to obtain these curves calculatively by using mathematical models.
Mathematical models for the flare curve, the photographic characteristic curves of the negative film and the photographic paper were established. After numerical analyses on parameters employed in mathematical models from experimental data, density values of prints were calculated from values of parameters by using mathematical models. Caluculated density values of prints were compared with experimental ones. Consequently it was found that good fitness was shown in highlight and midtone regions.View full abstractDownload PDF (608K) -
[in Japanese]1979 Volume 42 Issue 4 Pages 281-287
Published: August 30, 1979
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (937K)
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