| 摘要 |
An illuminator ( 1 ) comprises a substrate ( 2 ) supporting light source dies ( 4 ) driven via wire bonds ( 5 ). The substrate ( 2 ) comprises a silicon strip ( 20 ) in direct contact with a brass heat sink ( 3 ), thus providing for excellent heat transfer away from the die ( 4 ). Pads ( 10, 11, 12 ) of Ni, Ti, and Ag sub-layers support the die ( 4 ) and the wire bonds ( 5 ). These both provide electrical connections for the die ( 4 ) and also light reflection upwardly because the Ag sub-layers of the pads ( 10, 11, 12 ) are evaporated over a thermally grown oxide layer ( 21 ) on the Si ( 20 ). The oxide has a very high dielectric strength, thus maintaining excellent electrical insulating properties over a large voltage range. |
