著者
原田 保之助 高間 繁
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.12, no.3, pp.168-177, 1928

本文は最近開通せる本邦最初の地下鐵道の照明に就き調査せる結果である。大膿の照度は床上80糎の照面に於て, 停車場及プラットホーム25乃至50米燭, 電車丙37米燭であつた。
著者
Tomohiro Yako Yoshiki Kuse Shinsuke Nakamura Masamitsu Shimazawa Takashi Motomura Hideaki Hara
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.42, pp.29-32, 2019-03-27 (Released:2019-04-01)
参考文献数
12

Blue light emitting diode (LED) light is being used various devices for recent decades. Blue LED light has the 450–500 nm wavelengths, and high photon energy compared with green or red LED light. It is known that the exposure to blue LED light causes retinal photoreceptor cells damage. It is unknown whether the blue LED light cut particle containing lens has a protective effect against blue LED light-induced cell damage although the absorbance by colored lens shows a protective effect. Thus, the purpose of this study was to reveal that the protective effect of blue LED light cutting particle containing lens against photoreceptor and corneal epithelial cell damage induced by blue LED light exposure. We irradiated blue LED light to the mouse photoreceptor cells and human cornea epithelial cells with or without lens. The lens containing about one third blue LED light cutting particle (TECHPOLYMER) decreased production of reactive oxygen species and improved cell death rate and cell viability rate. These findings show that TECHPOLYMER containing lens may protect photoreceptor and cornea cells by reducing of reactive oxygen species.
著者
Tomohiro Jishi Kazuhiro Fujiwara Kyohei Nishino Akira Yano
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.36, no.3, pp.88-93, 2012-12-01 (Released:2013-03-04)
参考文献数
9
被引用文献数
3 7

The CO2 uptake rate (CUR) of the aerial part of cos lettuce (Lactuca sativa) was measured in pulsed and continuous light at an average photosynthetic (wavelength range: 400–700 nm) photon flux density (PPFD) of 100 μmol m-2 s-1 from white light-emitting diodes (LEDs). Three duty ratios of 25, 50, and 75%, combined variously with eight frequencies of 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, and 12.8 kHz were used for pulsed light irradiation. The CURs were significantly lower at a duty ratio of 50% for frequencies of 0.1–0.8 kHz and at a duty ratio of 25% for all frequencies than those in continuous light although the average PPFD was unchanged. These results indicate that pulsed light at lower duty ratios, combined with lower frequencies, makes CUR of cos lettuce lower than that attained in continuous light. We infer, based on a PPFD-CUR curve obtained with cos lettuce plant used in the experiment, that when greater PPFD is provided, pulsed light at lower duty ratios with lower frequencies is less advantageous than continuous light for photosynthesis.
著者
Joshua J Gooley
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.41, pp.69-76, 2018-03-20 (Released:2018-03-26)
参考文献数
46
被引用文献数
1

Light is the most important environmental signal for synchronizing human circadian rhythms. The circadian system is normally synchronized with the solar day, ensuring that the sleep–wake cycle and endocrine rhythms are timed appropriately. However, exposure to electrical lighting can also reset circadian rhythms. In this short review, we discuss properties of light stimuli that are important for resetting the human circadian system. The direction and magnitude of light resetting are circadian phase-dependent, with exposure to light in the early biological night resulting in a phase-delay shift of circadian rhythms, and exposure to light in the late biological night and early morning resulting in a phase-advance shift. Circadian resetting responses can be enhanced by increasing the irradiance or duration of the light stimulus, or by using short-wavelength blue light to activate intrinsically photosensitive retinal ganglion cells that express the photopigment melanopsin. This knowledge can potentially be applied to improve light therapy for circadian rhythm sleep disorders, and to help reset circadian rhythms in individuals exposed to shift work or jet lag.
著者
John D. BULLOUGH Ramesh RAGHAVAN Richard M. PYSAR Yukio AKASHI
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Light & Visual Environment (ISSN:03878805)
巻号頁・発行日
vol.31, no.1, pp.19-24, 2007 (Released:2007-06-08)
参考文献数
18
被引用文献数
1

Temporal characteristics of fluorescent lighting systems during starting might affect their acceptance in commercial and residential lighting. The immediate, full onset of light is usually experienced when switching on incandescent lamp systems. For certain systems using fluorescent lamps, delayed onset or initially low light levels might be experienced. Such characteristics could make them unwelcome additions to commercial and residential settings. The results of a study to investigate subjective and behavioral responses to lighting systems having different temporal characteristics upon start-up are presented.
著者
Ken-ichiro Suehara Takaharu Kameoka Atsushi Hashimoto
出版者
The Illuminating Engineering Institute of Japan
雑誌
Journal of Science and Technology in Lighting (ISSN:24323225)
巻号頁・発行日
vol.41, pp.12-21, 2018-03-20 (Released:2018-03-26)
参考文献数
33
被引用文献数
2

To construct a simple optical sensor for measurement of the sugar content in an aqueous solution, a bent optical fiber was used as the sensor. The attenuation ratio, i.e., the differences in the light intensity through the bent optical fiber when the sensitive part (bent part) was soaked in a reference material and sample solution, was closely related of the solute content in the samples. However, slightly difference in the light intensity were observed in the practical application because the sugar content in foods and other bio-systems was much lower than that in the tested samples. Therefore, we constructed a sensor system using a light emitting diode (LED), photo diode (PD) and simple electronic circuit as a differential amplifier. As a result, measurement of the sugar content ranging from 0 to 30 g/dm3 was successful and excellent agreement between the FT-IR method as the conventional method and the sensor method using an operational amplifier (OP-amp) was observed. In addition, the time courses of the sugar content and the uptake rate of plant cells were able to be calculated during the cultivation process. The process monitoring for the fermentation process management will be possible by using this sensor. These results suggested that the developed sensor using a bent optical fiber is applicable as a simple and disposable optical sensor.
著者
阿佐 宏一郎 小田 浩一
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会誌 (ISSN:00192341)
巻号頁・発行日
vol.94, no.5, pp.283-288, 2010-05-01
被引用文献数
1

The estimation of optimal print size for reading is often essential in clinical treatment and/or universal design; however, it is not known how to calculate the proper letter size for reading with maximum efficiency. Psychophysics studies have revealed psychometric functions of reading that exhibit a hill-like shape with a plateau of maximum speed and a downfall beyond Critical Print Size (CPS). To control the magnification rate of visual aids for patients with visual impairments, CPS that can indicate the boundary of maximum efficiency is now becoming a noteworthy index to determine optimal letter size. In addition to reading, word searching is also an important task for our living. However, the CPS of word search tasks has not been examined yet. We estimated the CPS of word search from the results of two experiments focused on searching for words in Chinese characters and Japanese alphabet (Katakana: square forms) in Japanese. The functions of the searching tasks showed a hill-like shape almost identical to the reading tasks but with elevated speed, and the CPS were stable around 0 logMAR in both the reading and the searching tasks. Hence, CPS is unsusceptible to tasks and can function as a robust marker for the smallest print size with maximum speed. This finding indicates that CPS is the threshold of proficiency (maximum/reduced) beyond the threshold of vision (visible/invisible). CPS can be a meaningful index to achieve the appropriate control of print size and subsequently help people with visual problems.
著者
西澤 勇志智
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.13, no.6, pp.303-315, 1929

本篇は照明學會東京支部の講演にして花火の發達由來を述べ, 績いて花火の化學的組成並に其諸種の應用殊に近代最新武器としての利用に就て読きたるものなり。
著者
橘 弘作
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.9, no.1, pp.17-32_10, 1925

In those days, the electricity has come to so close connection with our household that, when we think of the question of how to live, we are impossible to do it, without touching the problem of electricity. If the indication of the national power be made by some measure based upon the unit of a household. we must say that the home electricity, which is now being practiced, is the greatest work that will influence strong revolution upon our history of civilization.<BR>When the practical application of electricity is made for industrial use, the advantage or disadvantage can easily understood by such kind of the consumers from the point of amount of fee of electricity charged to them. But in case of home electricity, its advisability can not be judged merely from the above mentioned point, which will cause to make it difficult to see the universal diffusion of such electrification.<BR>Even if we let the things slide their course, it is evident that some time in future the home electricity will be practiced, but according to the present management of business of scientific organization, we must plan, under the positive policy, to shorten this age of transition to the largest degree with the highest efficiency. This is the reason for the necessity of establishing proper policy.<BR>There may be many means of leading things from the age of propaganda to the age of realization, such as distribution of printed matters, lecture meetings, demonstration, exposition, etc., all of which, however, can not be of absolute effect. But, the studies of the advanced nations worked out a very effectual means which involves all the strong points of the above said old means, and fills the defects thereof. This means is the opening of the electric home, and is being practiced in the Unite States so frequently and so successfully as almost 200 electric homes have already been opened since and as 35, 000 earnest observers have been attracted to each opening in advance.<BR>The first trial of this electric home show in Japan is the one that was opened in Chofu in the last October, of which I am going the following informations hereunder.<BR>1) Strong point of Electric Home as propagander for home electricity.<BR>2) Scheme of Electric Home.<BR>4) Ratio of electric equipment expense and the construction cost.<BR>5 Selection of wiring and accessories.<BR>6) Guide of Electric Home.<BR>7) Session and close hour.<BR>8) Adjustment of visitors.<BR>9) Treatment of visitors in party.<BR>10) Method of propaganda.<BR>11) Conclusion.
著者
溝尻 房藏
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.8, no.4, pp.317-363, 1924

従來探照燈用反射鏡は比較的光學的能率 (Optical Efficiency) の方面を八ヶ間敷く見て製造されて居たものである。それを換言ずれば曲面の性質を幾何學的に八ヶ間敷く云ふ事になる。從來列國の反射鏡製造會社はそれに力を入れて居た。故に各會杜とも相當の品を作り出す様になる迄には製造工場としての相當長年月の経験を練つて來たものである。則ち一夜作りの工場では斯る反射鏡は製造し得ないと云ふ課になるのである。則ち第一章及第二章では其事實を明白にした。故にそれを製出する工場は製作技能を低下させぬ様に、軍用として今差常り必要の無い品物でも不噺に製造を綾けて居なければならない事になるのだ。それがもし軍用以外に用途のない品物であるとすれば、斯る不漸の製造は随分不経濟な話である。然るに外國製造會杜從來の製造方法は斯る精密工業に窺するものであるに拘らず、産出した反射鏡は軍用以外に用途がない。故に著者は先づ第四章に於て、果して斯る光學的能率檜進のみに走る事が探照燈用反射拾としての性能の上より見て必要訣くべからざるものなるや否や銀明削にする爲めに探照燈用反射拾としての性能を論じた。両して其結果として反射拾の光學的能率上斯る僅小なる進歩が探照燈用反射鏡としての照射能力の上に影響する所極めて微細なるものである事を論じ、更に將來に残れる光學的能率上の進歩の拾地が探照燈用としての照射能力増進の上に殆んど影響せざるものである事を明白にした。一方に於て者者は大氣の光吸牧の影響と光波の波長との關係を論究し、それによつて鏡面を光の波長の上より特種の性質を持たしめるならば優に人間の網膜に感じ得る程度の照射能力の差異を與へ得るもので、りる事を確め、それによつて將來の進歩の蝕地が硝子鏡よりも寧ろ金屬鏡の方にある事を結論した。則ち著者は探照燈用反射鏡製造方法研究上の將來の望みを、長波長光線を射出し得る金艦鏡の上に置き夫れが製造方法研究問題として<BR>1.) 「例へ光學的能率が探照燈用ごしての照射能力の上に影響を及ぼさざる程度にまで低下するも、これが爲めに特種精密工業みしての不噺の訓練を要せず、寧ろ不用意の中に一朝の有事に際して直ちに生産し得る方法」てう問題は今日の如き軍和時代に於て國家経濟上極めて重要なる研究問題である事を述べ、2.) 「反射鏡製造が從來列國製造働出く於て保守せらるる如き特種精密工業に馬し其技能をして低下せしめざる爲めに、職箏の有無に拘らず不筋の製造緩績を要ずるものみせば、それに仍て産出せらるる反射鏡は軍用以外今一段の精密を要する用途に適するものたらしむる製造方法」に向つて研究すべきである事を論述した。然るに此<BR>1.) 及び<BR>2.) の要求に應じ得る製造方法をして從來列國反射鏡會社が保守し來れるものの中に登見せんとするも、それは不可能であつてそれは一つに著者の発見に拘る反射鏡製造方法中第本章に示す方法が 2) 、の要求に應じ得るものであり第六章に示す方法が 1) 、の要求に適するものである事を明白にしたものである。
著者
井上 学 野口 公喜 戴 倩穎 下村 義弘 岩永 光一 勝浦 哲夫
出版者
The Illuminating Engineering Institute of Japan
雑誌
照明学会 全国大会講演論文集
巻号頁・発行日
pp.113, 2002 (Released:2003-07-17)

前回の実験により, 被験者の主観的選択から求められたオフィス照明の最適な色温度は自然光に近似した変化を示すことが分かった. 今回は, 求められた色温度変動カーブによるアンビエント照明の制御と一般的な5000K一定の照明要件とを比較して心理·生理的影響の違いを評価した. 机上面照度はいずれも900lx一定とした. 実験は, 調色可能な照明器具が天井に埋設された無窓の部屋を使用した. 実験測定時間は07:30∼12:30及び13:30∼17:30の合計9時間とし, 主観評価, 生理データ(脳波, 心拍変動, 血圧等)を測定した. その結果, 自然光の色温度変化に近似した色温度変動照明要件は一般的な5000K一定の照明要件と比較し, 疲労感や眠気, 精神的な緊張の軽減をもたらす効果のあることが示唆された.