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ID 42777
フルテキストURL
Thumnail 68_2345.pdf 2.6 MB
タイトル(別表記)
Artificial Lighting by Fluorescent Lamps Part III. Fundamental Study Effects of fluorescent lamps on the speed of vision and moving object
著者
成瀬 龍城 岡山大学医学部衛生学教室
抄録
The author has, ever since 1950, been in the comparative study of fluorescent lamps and incandescent lamps as artificial light-sources by making quantitative and qualitative experiments to prove which is superior from the viewpoint of eye-hygiene and illumination engineering. This time, the author conducted comparative experiments with both types of light-sources in relation to speed of vision with fixed test types, and discernible velocity with moving objects, coming to the following conclusion. A. Fixed Test Types (1) Of all types of light-sources, irrespective of white or colored, time of exposure drastically lessens for the range from 1 H. Lux to 30 H. Lux, and the minimum is reached at about 50 H. Lux. Then gradual decrease in time of exposure continues up until 100 H. Lux. The speed of vision is proportional to logarithm of intensity of illumination. (2) White light is usually superior in speed of vision to any colored light, namely, de luxe daylight fluorescent lamp is best, and then daylight fluorescent lamp and white fluorescent lamp come next slight differences. Then the incandescent lamp, blue-white fluorescent lamp, green fluorescent lamp, and pink fluorescent lamp follow in the order. (3) The rate of the increase in speed of vision to the increase in intensity of illumination is greater in low intensity of illumination, and it grows smaller as intensity of illumnation rises up. B. Moving Object (4) Discernible velocity varies even with the same regularly spaced black and white stripe-patterns in accordance with the angle to face the direction of movement. Discernible velocity is at the minimum in case of the angle of ±45°, and as getting farther off from this angle, it grows the greater. (5) The broader the space is between the black and white stripes, the greater will be the discernible velocity. (6) In case the size of test type remains unchanged, discernible velocity suddenly grows greater until the intensity of illumination on the surface of test type is as large as 3050 H. Lux, and thence up to 500 H. Lux, it continues to increase but gradually. Discernible velocity is proportional. to logarithm of intensity of illumination. (7) In case intensity of illumination is constant, discernible velocity gets heightened, as the test type grows larger in area. A lineal relation is established between the two factors. (8) In case the bright and dark faces of the moving object continue to alternate, the illumination by fluorescent lamps is found inferior to that of incandescent lamps in low intensity of illumination up to 100 H. Lux. In cases other than the above, no significant difference is noticed between the two light-sources, irrespective of moving object or intensity of illumination.
発行日
1956-12-31
出版物タイトル
岡山医学会雑誌
出版物タイトル(別表記)
Journal of Okayama Medical Association
68巻
12号
出版者
岡山医学会
出版者(別表記)
Okayama Medical Association
開始ページ
2345
終了ページ
2359
ISSN
0030-1558
NCID
AN00032489
資料タイプ
学術雑誌論文
オフィシャル URL
https://www.jstage.jst.go.jp/article/joma1947/68/12/68_12_2345/_article/-char/ja/
関連URL
http://www.okayama-u.ac.jp/user/oma/
言語
Japanese
OAI-PMH Set
岡山大学
著作権者
岡山医学会
論文のバージョン
publisher
査読
有り
Sort Key
15
Eprints Journal Name
joma