ABSTRACT. We have proposed a volumetric 3D display in which cross-sectional images are projected on a rotating spiral screen. One of challenges of this method is an existence of a blind area generated depending on viewpoints. In this research, a new type of screen was fabricated to reduce the blind spot area by trimming off as much of the screen as possible except for the spiral surface. The blind spot area was calculated by ray tracing simulation and compared with that of the screen without the trimmed spiral surface. As a result, the visibility of the left semicircular region was improved when the viewpoint position of the new screen was low.

ABSTRACT. This paper introduces the formation of wiring to the decorative film. The conductive ink ribbon used in this development has a thin thickness of about 0.1 ~ 0.2 μm. Wiring can be formed on a film such as PET by thermal transfer melt printing. In addition, it is possible to form a decorative layer and a wiring layer of various designs By laminate printing in one or two runs. Therefore, it can be expected that a touch function will be added to the back surface of the smartphone by adding wiring to the decorative film.

ABSTRACT. Ag deposition-based Electrochromic (EC) device represents various colors by localized surface plasmon resonance. Four vivid chromatic colors of magenta, cyan, yellow, and green color were represented by precise control of the electrodeposition process of Ag nanoparticles.

ABSTRACT. As examples of a well-known 3D display system, there are 3D films. Observer usually needs to use glasses such as polarized light filter, shutter, etc. Using glasses methods are provided not only in theaters but also in house. However, they are troublesome because the user must put on glass. Therefore, glass-free 3D display systems are receiving attention. Our laboratory develops the 3D display using holographic optical element array screen. However, it is created by hand. Handmade screens are not reproducibility and reality because the screen need too much holographic optical elements and manual adjustment change its performance. The purpose of this study is to automate the process

ABSTRACT. Recently, our society has increased older people. Accordingly, many Universal Design Fonts (UDF) with high legibility for elderly and disabled people have been developed and using various applications. This paper presents a development of legibility evaluation method for fonts based on image processing and the development of a UDF as “Minna no Moji,” and other applications of our legibility evaluation method. We present 2 applications of our legibility evaluation method. One is developing a universal design calendar using “Minna no Moji,” and the other is pictograms for food allergy labeling.

ABSTRACT. Due to the increase in the variation of copier paper brands, the contribution of paper powder to paper feeding problems in MFPs has been increasing. And the demand for the performance of rubber rollers has been increasing. Although it is known that paper powder adhesion affects the performance of paper feeding modules, there are not many reports that quantitatively clarify the effects of paper powder adhesion on the friction and wear of rubber rollers. In this study, we developed an observation method of the rubber roller surface and quantitatively clarified the effects of shape of calcium carbonate particles and paper surface roughness. It was clarified that the relative size of the paper powder particles to the paper surface roughness is related to the friction characteristics.

ABSTRACT. The charge transport equilibrium mechanism proposed by Kurita is useful as an analysis model of development characteristics in two-component development method of electrophotography, and has been applied in many MFP designs. In this model, the traveling distance of the counter charge is treated as a constant, and its value is estimated experimentally. The author tried an iterative calculation of the process of counter charge transport by applying a diffusion model and an electric charge mobility model. In each calculation model, the development characteristics showed a gradual time dependence after a lapse of a predetermined time, and the results obtained that the charge transport equilibrium mechanism was generally supported.

ABSTRACT. We took photoelastic image of the edge of the cleaning blade at high speed. By tracking the fringes showing the internal stress in the obtained high-speed photoelastic video, the vibration of the internal stress was captured as numerical data. It was also confirmed that the vibration value of the internal stress changed when the contact conditions of the cleaning blade were changed. The method for measuring the vibration of the internal stress acting on the blade edge was obtained. In this way, the vibration of the internal stress acting on the edge is measured and an S-N curve is derived. We report the possibility that the fatigue wear of cleaning blades can be explained by the linear cumulative damage rule.

ABSTRACT. An image defect that occurs in development process of electrophotography called starvation is well known, which is decline of image density typically occurring on tail edge of halftone image before solid image. This time, we describe forming mechanism of the starvation by handling newly developed experimental apparatus and image processing method for high-precision visualization analysis of quantitative toner behavior. It was clarified that the starvation is mainly formed by the following three mechanisms; insufficient development by edge effect of electric field while passing at pre-nip, repairing of insufficient development while passing at inside-nip, and electric scavenging while passing at post-nip due to the reverse electric field formed by the carrier with residual countercharges.

ABSTRACT. In the electrophotography development process, various development parameters are optimized to obtain excellent and stable development quality. In addition, various important intermediate characteristics intervene between the development parameters and the development characteristics, and the mutual relationship among them was analyzed. Focusing on the neutralization rate and starvation defect as important development characteristics, we investigated the relationship with the important development parameters. The neutralization rate describes development ability and starvation defect is decline of image density occurring on tail edge of halftone image before solid image. In addition, as intermediate characteristics, the developer density and velocity were analyzed. It was clarified that the neutralization rate and starvation grade vary depending on the developer density and velocity. It is useful that development parameters which optimize these characteristics.

ABSTRACT. Currently, beef-grade-evaluation is determined by visual inspection. It has 3 problems. Its criterion is different from person to person, it can be varied by the inspector’s standard, mood and fatigue. For these reasons, the evaluation is qualitative. Therefore, by performing fractal analysis on beef marbling with fractal characteristics, we aimed to quantify the complexity of beef marbling and to evaluate beef grading quantitatively. The grade evaluation for beef marbling is based on BMS No, an index of beef marbling set by Japan Meat Grading Association. In the experiment, a beef cross-section was taken and fractal analysis was performed from the image. As a result, it was confirmed that there was a correlation between BMS No and fractal dimension, suggesting the effectiveness of the proposed method.

ABSTRACT. Material appearance varies in a mixture of attributes, such as color, gloss, and texture. However much studies only quantified material appearance in a single attribute using image statistics. In this study, we aimed at quantifying an “unified material appearance”. In our previous study, we measured differences in unified material appearance of facial surfaces, and we made prediction models of subjective responses using up-to-third order image statistics. Here, we examined the models for real objects. Plastic corrugated sheets were used as examples of real objects. It was found that the same models worked well with very close standardized partial regression for both types of stimuli.