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Volume 43 (1980)
- Issue 6 Pages 327-
- Issue 5 Pages 273-
- Issue 4 Pages 221-
- Issue 3 Pages 157-
- Issue 2 Pages 83-
- Issue 1 Pages 5-
Volume 43, Issue 6
Displaying 1-6 of 6 articles from this issue
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Takezo ONO, Mineo WATANABE, Hiroshi IINO1980 Volume 43 Issue 6 Pages 327-334
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSNew process to recycle spent developer waste for black and white photographic films was investigated.
The principle of the process resides in (I) removal of halide ions by means of electrodialysis with anion-exchange membrane, (II) simultaneous electrolytic reduction of oxidized components at cathode and (III) subsequent addition of chemical ingredients before re-use.
This process has been successfully applied in commercial scale to the developer waste for fine grain black and white film for years. More than ten times of re-use indicates no significant problems in grey scale control. Introduction of this process has reduced not only reagent cost but also pollution or waste treatment cost substantially. It was also found that this process is applicable to recycling developer waste for color film or paper.View full abstractDownload PDF (3060K) -
Tadaaki TANI1980 Volume 43 Issue 6 Pages 335-346
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDiscussions are made on the possibility and area of research for the increase in photographic sensitivity, on the basis of the analysis of the factors which limit photographic sensitivity of spectrally unsensitized and sensitized emulsions. The mesured values of quantum sensitivities of most emulsions are smaller than the ultimate limit. Especially there is still significant room for the increase in sensitivity of large emulsion grains. Discussions are made on dispersion of latent images, recombination, and diffusion length of photoelectrons, as the causes for the inefficiency of latent image formation. It is shown from many experimental results that there is little room for the increase in photographic sensitivity by improving φγ in practical emulsions. However, studies by many groups of workers indicate that there is large room for the increase in sensitivity by depressing dye desensitization and improving incomplete light absorption by dyes.View full abstractDownload PDF (1486K) -
Kiyonari FUKUE, Haruhisa SHIMODA, Toshibumi SAKATA1980 Volume 43 Issue 6 Pages 347-357
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSCharacteristics of the three radiometric correction algorithms, i.e., cosn θ correction, Fourier filtering, and polynomial approximation were studied. A variety of radiometric distortion observed in aerial photographys, e.g., relative illumination decrease in the edge of the image due to cos4 law and/or vignetting, reflection or scattering in the camera body, sun spot, etc. can be classified into the following three categories 1) additive radiometric distortion, 2) multiplicative radiometric distortion, 3) both of 1) and 2).
In this report, the principles and characteristics of the above three radiometric correction algorithms were clarified according to the three radiometric distortion categories. Furthermore, simulation of radiometric corrections were carried out to examine correction accuracies and processing times of each algorithms.
As a result, the best correction algorithm for conditions of radiometric distortion were decided.View full abstractDownload PDF (9591K) -
Principle of the New Imaging SystemSeiji HONMA, Eiichi INOUE1980 Volume 43 Issue 6 Pages 358-364
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA new peel apart imaging system based on decarboxylation reaction was studied. A polymer layer which contained carbon black and organic carboxylic acid was sandwiched between a cover film and a substrate film. When it was imagewisely exposed to a flash light either through the cover film or through the substrate film, gaseous carbon dioxide evolved and the polymer layer became detachable from the film through which illumination was performed. Therefore, a visible image was obtained by peeling the cover film off.
Organic carboxylic acids with the thermal decomposition temperature below 120°C gave good results when used in this system.
For imge formation, the exposure had to be done through the cover film or through the substrate film to which the polymer layer adhered stronger. The adhesive force depends on the polymers used for the photo-thermal sensitive layers, the cover films and the substrate film.
In one example, a solid solution of acetonedicarboxylic acid in polymethyl methacrylate matrix with dispersed carbon black was coated as an photo-thermal sensitive layer between a polyethylene terephthalate substrate and a transparent cover film with adhesive layer. By imagewise flash exposure through the substrate film, a positive and a negative image was formed on the substrate and the cover film, respectively.
The image of this system showed a high contrast and a resolving power of 2 lps/mm.View full abstractDownload PDF (4288K) -
1980 Volume 43 Issue 6 Pages 365-385
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (3179K) -
1980 Volume 43 Issue 6 Pages 392-399
Published: December 30, 1980
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (1016K)
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