프레넬 렌즈를 사용하지 않는 초소형 고효율 LED-200HI 등명기 연구개발

Abstract

Navigation aids to support the safe navigation of ships, which has been expanded with the increase of maritime traffic in the offshore and population of marine activities. In order to secure the safe operation of the ship at night, the marine lantern was developed in various ways through the invention of the LED and the development of the chip. The most commonly used marine lanterns in the market are the LED-200 and LED-200HI products, which account for two-thirds of the inspected quantity. They exhibited the same diameter but differ in the required light travel distance. In order to satisfy the required candela of LED-200HI, the manufacturers using a structure to laminate the modular LED on the existing LED-200 model or a method of manufacturing the separate LED-200HI product. However, the stacked type LED marine lanterns possess some problems such as low efficiency due to lot of power consumption and difficulty in replacement of all LEDs in the internal lanterns. In addition, existing marine lanterns use a Fresnel lens to emit light in parallel, which is a main reason in increasing the manufacturing cost. In this study, we implemented the LED-200HI product which meets the standard specification through optical design with double reflection structure without Fresnel lens. Moreover, we developed a Flasher Circuit equipped with an automatic current device, and developed the product to be compatible with LED-200 and LED-200HI in the same model. The white-light intensity of the LED-200HI was measured as 797 cd, this value exceeding 11.86% compared to the required intensity of common LED-200HI. The power consumption was 31.3% of minimum power, 31.1% of rated power and 42.8% of maximum power, indicating that the efficiency is greatly improved. The measured vertical divergence angle was found to be between 0.4 and 2.8° and the chromaticity coordinates were x = 0.334 and y = 0.351, which appeared within the allowable range of LED-200HI. We designed marine lantern with the double reflective structure without Fresnel lens by using only a single high power LED chip. As a result, we realized a compact size with 44.67% of the light-lifter and reduction from 51.93 cm to 23.20 cm compared to existing products. The weight of the product is only 36% of the existing products. Therefore, these results suggest that the convenience of workers is not only greatly increased but also manufacturing cost and port maintenance budget decreased dramatically for the installation, dismantling and transportation of the lanterns with double refractive structure.