著者

田中 克 堺 俊克 岡本 信治 清水 康夫

出版者

一般社団法人 映像情報メディア学会

雑誌

映像情報メディア学会年次大会講演予稿集 2010 (ISSN:13431846)

巻号頁・発行日

pp.6-11-1-_6-11-2_, 2010-08-31 (Released:2017-05-24)

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We have developed the compact high resolution CRT for HDTV viewfinder. By using phosphor thin-films, the horizontal resolution of 900 TV lines was obtained by optimizing the device structure of CRTs and the growth condition of phosphor thin-films.

著者

大野 智史 清水 康夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.81, no.830, pp.15-00123, 2015 (Released:2015-10-25)

参考文献数

6

被引用文献数

1 1

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The research discussed in this paper proposed a control method that imparts equivalent friction to electronic power steering (EPS) systems in order to improve the steering feel. In order to impart friction stably, the proposed method uses motor torque rather than mechanical elements to impart friction. First, the effect of friction on the steering system was considered theoretically using simple harmonic motion models, and it was demonstrated theoretically that steering responsiveness could be increased by imparting appropriate friction force to the steering system. Based on the results of this analysis, a target value for equivalent friction force to be imparted by means of EPS control system was formulated. A method of linear approximation of the friction force necessary to realize equivalent friction force based on this target value was proposed. The method was applied in an actual vehicle, and the EPS system configuration necessary for the desired effect to be obtained was examined. It was considered that a system configuration incorporating a steering torque sensor with high torsional rigidity would be necessary, and a control method for imparting equivalent friction force was proposed. Finally, the effectiveness of the proposed method was verified in simulations using a vehicle model and in tests involving an actual vehicle. The vehicle model simulations demonstrated that the application of the proposed method increased steering responsiveness. The vehicle tests verified that the proposed method made it possible to obtain a stable steering feel, and was also effective in improving steering feel.

著者

清水 康夫 金井 智良

出版者

一般社団法人 映像情報メディア学会

雑誌

テレビジョン学会誌 (ISSN:03866831)

巻号頁・発行日

vol.50, no.9, pp.1397-1402, 1996-09-20 (Released:2011-03-14)

参考文献数

4

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Hi-Vision products have become very popular as the technology has been developed. Consequently, there is a growing demand for a Hi-Vision video camera View-Finder. We have developed a monochrome CRT that can be used as a Hi-Vision View-Finder. In this paper, we will discuss the key technologies of this CRT.(1) Steps taken to improve resolution.(a) Improved glass bulb which can take a high voltage.(b) Improved phosphor screen.(c) Improved electron gun.(2) Steps taken to improve circuitry. We have developed : (a) A wide band video circuit, a stable deflection circuit, and a high-voltage circuit.(b) A precision beam correction method based on a unique digital circuit.We have achieved our target specification for this prototype and have confirmed that the CRT can be used for Hi-Vision View-Finder applications.

著者

瀧下 謙一 米田 篤彦 清水 康夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.81, no.827, pp.15-00101-15-00101, 2015 (Released:2015-07-25)

参考文献数

4

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In this paper, we focused on the fact that the ease of driving changed according to torsional rigidity of the electric power steering system for the purpose of the improvement in control performance of vehicle. First, the influence on transfer characteristics from a steering angle(steering wheel) to front wheel angle(front tires) by torsional rigidity was considered theoretically. As a result, it turned out that a front wheel angle was determined by not only a steering angle but also the influence of the dynamic state of vehicle, and it was shown that the influence of the dynamic state of vehicle can be shut by making steering torsional rigidity into high torsional rigidity. Next, the validity of a theoretical verification was confirmed through numerical simulation of steering correction at the time of a disturbance input. Finally, the lower limit value of torsional rigidity for practical use of a high torsional rigidity steering was determined.

著者

田中 陽介 清水 康夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.79, no.804, pp.2874-2883, 2013 (Released:2013-08-25)

参考文献数

8

被引用文献数

1 1

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We have been investigating small and high-strengthened single threaded worm gear. Previous our studies have shown that reducing thickness of worm tooth on addendum face enlarges elastic deformation of worm wheel. This proposed profile has advantages on improving contact ratio, gear efficiency, strength against impact force and fluctuation in torque. Though we have modified the profile of worm, we have not reported on a profile of worm wheel. In this paper, we propose the MUB theory that new profile of worm wheel improve contact ratio without increasing tip diameter of worm wheel. At first, we focused on meshing under base circle of worm wheel, and investigated geometrical shape on dedendum face manufactured by hob cutter. As a result, we derived formula of new profile of worm wheel for meshing under base circle. In addition, the MUB theory was verified by the experiment that used an actual worm wheel with MUB profile. It was shown that we obtained a new finding by the process of this research.