| 摘要 |
PROBLEM TO BE SOLVED: To attain LED sign panel that can be designed in a thin-type showing a high radiation effect as well as a high waterproof effect.SOLUTION: There is provided LED sign panel comprising a light guide plate for guiding light of LED light source incident from one side toward an opposing side, a reflection means arranged at a rear surface of the light guide plate so as to reflect light from the side of LED light source toward a front-side direction, and an advertisement display area at the front surface of the light guide plate lighted up by the reflection light of the reflection means. This LED sign panel comprises a concave groove part formed in an area out of a projected plane in the advertisement display area at the rear surface of the light guide plate out of the advertisement display area, a heat sink part including an inserting part inserted into this concave groove and an abutting surface part covering the concave groove and abutting against the rear surface of the light guide plate, a plurality of LED light sources arranged side-by-side at the inserting part of this heat sink part and a sealing means for sealing a clearance between the abutting surface part and the rear surface of the light guide plate, and the abutting surface part of the heat sink part is formed to cover a projected plane of the advertisement display area. |
