著者

本郷 一隆 宮内 真人 林 健太郎 興梠 政広 秋永 良典 芹川 聖一

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.99, no.11, pp.589-593, 2015-11-01 (Released:2016-02-01)

参考文献数

6

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Blue LEDs are now mass-produced, and road traffic signal heads using LED systems are being used. LED signal heads have advantages such as energy savings and a long life. However, newly proposed LED signal heads have difficulty reducing problems such as the washout phenomenon. In this paper, we have proposed reducing the washout phenomenon of LED signal heads by using LED element 192 and the low-reflection black plate called a“phantom board”on a blank area between the elements. On the basis of light intensity distribution and luminance uniformity measurements, it was confirmed that the LED signal head we proposed satisfies the conditions described in the traffic signal lighting specifications of the National Police Agency. The visibility of the signal head was improved, as apparent from the before and after improvement pictures taken in the morning and the evening when the sun was at a low altitude and as a result of the phantom ratio.

著者

宮内 真人 下村 輝夫 興梠 政広 進藤 直行

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.82, no.11, pp.917-920, 1998-11-01 (Released:2011-07-19)

参考文献数

8

著者

宮内 真人 下村 輝夫 興梠 政広 原 真二 遠藤 剛

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.84, no.11, pp.832-837, 2000-11-01 (Released:2011-07-19)

参考文献数

12

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The National Police Agency has yet to propose detailed specifications for preventing signal head phantoms; they are currently being examined by the agency. The pedestrian signal head developed by our project satisfies the standard for the luminous intensity distribution specified by the agency. With this film type of pedestrian signal head, the ratio of signal light to sun phantom was found to be three times as that of much as current pedestrian signal heads.