| 摘要 |
An illumination unit is provided, including: a casing; a plurality of LED boards each including a graphite sheet adjacent to inside of the casing to diffuse heat, a non-conductive layer stacked on the graphite sheet, and a conductive thin-film formed on the non-conductive layer; and a plurality of LEDs that is regularly arranged to receive an electrical drive signal from the conductive thin-film and to emit light. Accordingly, since the illumination unit includes the graphite sheet that is higher in thermal conductivity, lower in production cost, and more flexible than the metal PCB, it is possible to efficiently dissipate heat produced by the LEDs and to prevent the illumination unit from being deteriorated. Further, it is possible to produce it at a lower cost and to achieve a high heat-dissipation efficiency since the graphite sheet has a high thermal conductivity and a high sealing property even though it is directly attached to the casing. |
