Projecting electrode structure having a double-layer conductive layer

A projecting electrode structure, comprising:

• an electrode provided on a substrate;
• a first conductive layer provided on said electrode;
• an insulating projection provided at a center of an upper surface of said first conductive layer within a surface area range of said first conductive layer;
• and
• a second conductive layer covering the surface of said insulating projection, said second conductive layer having a peripheral portion piled upon said first conductive layer in a direction of thickness of said peripheral portion of said second conductive layer so that said second conductive layer is electrically coupled to said first conductive layer, and said second conductive layer including a first layer and a second layer, said first layer of said second conductive layer being made of one of chromium (Cr) and titanium (Ti) and said second layer of said second conductive layer being made of gold (Au).

A projecting electrode structure, comprising:

• an electrode provided on a substrate;
• a first conductive layer provided on said electrode;
• an insulating projection provided at a center of an upper surface of said first conductive layer within a surface area range of said first conductive layer;
• and
• a second conductive layer covering the surface of said insulating projection, said second conductive layer having a peripheral portion piled upon said first conductive layer in a direction of thickness of said peripheral portion of said second conductive layer so that said second conductive layer is electrically coupled to said first conductive layer, and said second conductive layer being plural-layered,
• wherein a periphery of said second conductive layer coincides with a periphery of said first conductive layer.