| 摘要 |
PURPOSE:To decrease light absorption factor of a substrate and also to improve radiation by a method wherein an almite layer on an Al base is subjected to mirror finish, and LED is provided on a printed circuit formed through a transparent insulating film. CONSTITUTION:An Al base 2 is oxidized to form almite layers 3, 4. The surface of the layer 4 is subjected to mirror finish, a transparent insulating layer 5 in epoxy resin is provided, and a printed circuit layer 6 in copper foil is placed thereon. LED 7 is mounted and connected 8 on the circuit layer 6, and a reflecting frame 9 in resin is mounted thereon. According to this constitution, radiation and reflectivity are given in good condition, and a high luminance can be displayed. The constitution is therefore effective particularly for using a green LED and for pulse driving. |
