Patent ID: 7994616

Claim:
A semiconductor light-emitting device comprising: a package that includes a cover made of a transparent resin and a base made of an insulating resin whose refractive index is different from a refractive index of the cover; a lead including an inner part enclosed in the package and an outer part that is outside the package; and a semiconductor light-emitting element mounted on the inner part of the lead, wherein: an outermost coating of the inner part of the lead includes a first area and a second area, the first area including a silver or silver-alloy and the second area including a gold or gold-alloy, the cover is in contact with the first area but not in contact with the second area, and an outermost coating of the outer part is a gold or gold-alloy coating, the lead includes a nickel or nickel-alloy coating and a palladium or palladium ally coating, the nickel or nickel-alloy coating the palladium or palladium-alloy coating, and the silver or silver-alloy coating substantially entire cover the lead, in the fist area the nickel or nickel-alloy coating, the palladium or palladium alloy coating and the silver or silver-alloy are applied in the stated order, and in the second area the nickel or nickel-alloy coating, the palladium or palladium-alloy coating, the silver or silver-alloy coating and the gold or gold-alloy are applied in the stated order.