High-collimation high-efficiency LED warning light
Xu Chaoqin 1, Chen Qizhen 2, Lu Mingxin 3
1Department of Mechanical Engineering, National Central University, No. 300, Zhongda Road, No. 2, Wuquanli, Zhongli City, Taoyuan County, Taiwan, (03) 4263392, .tw
2 Professor, Department of Mechanical Engineering, National Central University
3 General Manager of Dongyu Industrial Co., Ltd.
Abstract: Design a high-collimation high-efficiency LED warning light. Using an LED lampshade, according to the definition of FWHM, the light source can be distributed within three degrees of positive and negative, and then use a mirror surface to match the lampshade design of the LED light source. The vertical outgoing light is distributed between zero and six degrees, and the horizontal direction uses a cylindrical mirror to disperse the horizontal outgoing light, which has achieved uniformity.
Keywords: warning light, LED, high collimation, high performance
Foreword
Highly professional warning lights are widely used in high-rise buildings, navigation, aviation and other places where safety is required. Take Taiwan as an example. As the height of buildings increases, many buildings and chimneys must be equipped with obstacle lights to maintain flight safety. In addition, the sea and the airport must have warning lights as the source of light source for the navigation channel, so there is more and more demand in the market; but the current market is also due to the general technical bottleneck on the island to produce general warning lights. Lord, there are few companies that can produce high-level warning lights such as aviation and navigation, so that the warning lights used in Taiwan often have to be purchased overseas. For example, Taipei 101 and Taiwan high-speed rail all spend high funds to purchase warning lights from abroad, so hope and With technological breakthroughs, it is possible to create products of extremely high value.
1. Principle architecture and method
The program of ray tracing and statistical and simulation data is mainly used by the optical simulation software ASAP.
1.1 LED light source shade
First, we use a collimated LED lamp designed by the laboratory chief as shown in Figure 1. The result can be as shown in Figure 2, the divergence angle is between -3 and 3 degrees, and its uniformity can reach 83.6%. Show
1.2 Internal structure of warning lights
1. Mirror surface:
Using the law of reflection: the angle of incidence is equal to the angle of reflection, and when the incident ray is constant, the angle of the mirror is changed, and the reflection line is changed to the angle plane mirror image.
We use this mirror surface to reflect the light in all directions because the target vertical emission angle: 0 ~ 6 °, and the collimated LED lamp divergence angle is -3 ~ 3 degrees, so the reflected light needs to rotate 3 degrees, the mirror only needs to rotate 1.5 degrees Therefore, the angle between the mirror surface and the horizontal is 45+1.5=46.5 degrees, and its design is shown in Fig. 4.
After the light of a single collimated LED lamp passes upward through the reflecting surface, the upward collimated light is reflected to the horizontal direction, and the vertical divergence angle of the light can be measured between 0 and 6 degrees, and the horizontal divergence is half the strong angle at -8. ～8 degrees, the illuminance uniformity in the horizontal direction is only 36%, as shown in Figure 6; Figure 5 is a schematic diagram of the surface to be detected, because the illuminance distribution will be circularly symmetric, so the illuminance distribution map of Figure 7 only draws 0 to 30 degrees. Range
2. Columnar mirror:
Because the uniformity in the horizontal direction is not very ideal, only 36%, so we use the characteristics of light refraction, design a cylindrical mirror to make the distribution of light in the horizontal direction more uniform, the light path diagram shown in Figure 8.
Thus, the cylindrical mirror is used to make the horizontal direction a divergent light, as shown in FIG. 9 and FIG.
After the light passing through the mirror surface passes through the refracting hood, the vertical divergence angle of the light can be measured to be between 0 and 6 degrees, but the horizontal divergence half-strong angle has been dispersed to between about -25 and 25 degrees, and the horizontal illuminance. The uniformity is increased to 63%, as shown in FIG. 12 and FIG. 13; FIG. 11 is a schematic diagram of the surface to be detected.
3. Results
The lampshade, the mirror surface and the columnar mirror of the LED light source are combined. The overall structure diagram is shown in Fig. 14. As the light distribution control of the whole system, the ASAP optical simulation software is used to place the surface to be inspected eight kilometers away, as shown in Fig. 15. Figure 16 shows.
The measured intensity distribution is shown in Figure 17. The red line represents the vertical light intensity distribution. The target vertical emission angle is 0-6°. The illuminance distribution is shown in Figure 18. The illumination uniformity is 50. %
4 Conclusion
In the design of the LED warning light in this study, the final result of the optical system is simulated in the whole system of the collimated and uniform LED lampshade, reflector and refracting photo. It is found that the vertical emission angle of the light on the detection surface is about 0 km away. -6°, while the overall (6 LEDs) output effective light uniformity is about 50%; since the environment in which such products are applied is a safe and high-demand place, the light intensity of the lamp will be determined according to different places (cd /m2), visual distance and angle, etc., and the above results have reached the relevant specifications.
references
1. Green; David R, Russell; L. Brock, "Light assembly", United States Patent, 5782552, 1998.
2. H. Kanayama, M. Maeda, T. Miwa, T. Ikeda, H. Murata, and K. Chihara, “Ultra Small Projector with High Efficiency Illumination System,†Consumer Electronics, ICCE Digest of Technical Papers, pp. 127-128, (2006).
3. HM Keuper, G. Harbers, and S. Paolini, "RGB LED Illuminator for Pocket-Sized Projectors," SID Symposium Digest of Technical Papers, Vol. 35, pp. 943-945, (2004).
4. MP Krijn, BA Salters, and OH Willemsen “LED-based mini-projectors,†SPIE vol. 6196, 619602, (2006)
(This article is from the 2008 China Optoelectronic Industry High-level Forum Proceedings)
Electronic Transformer,Single Phase Transformer ,Step Up Transformer ,Auto Transformer
Power Adaptor Co., Ltd. , http://www.nbadapter.com