이중반사형 LED 등명기의 외함설계 및 standing bar를 적용한 중형 LED 등명기의 광학설계

Abstract

A navigational aid is 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 or sea fog, the marine lantern was developed in various ways through the invention of the LED and the development of the chip. There is a problem which is vulnerable to sealing because domestic commercial LED marine lanterns consist of many components and complex assembly. For prevention of rainwater and seawater encroachments, the bolt is fastened from bottom to up, resulting that bolt fastening leads to be uncomfortable position of workers. In order to solve these problems, thread fastening was adopted in the double reflective marine lantern instead of bolt fastening. And the height and width of the housing were reduced to 45% and 44% by integration of many components and complex assembly, respectively. It is not suitable to use many LED chips in middle size marine lantern because initially developed double reflective marine lanterns are optimized for small size marine lantern used in 8 NM with narrow reflective area. To overcome this limitation, a standing bar is applied in double reflective marine lanterns. The light distribution simulation was carried out for various conditions such as shape of standing bar, number of LED chips and power consumption of LED chips. As a result, marine lantern using twelve 18 W LED chips with 4 layers and hexagonal shaped standing bar showed the lowest power consumption of 282.24 W and met KS. Therefore, the light distribution simulation of double reflection middle size marine lantern using standing bar is expected to be applicable to middle size marine lantern for 15 NM.