Wiring substrate with spring terminal and mounting structure for the same, and socket

A wiring substrate with spring terminal, comprising:

• a wiring substrate including a first face, a second face on an opposite side to the first face, and a wiring layer provided on the first face, and the wiring layer including a plurality of first wiring patterns for a signal transmission and a first ground pattern grounded to a ground potential;
• and
• a plurality of spring terminals connected to the plurality of first wiring patterns of the wiring substrate respectively, the respective spring terminals including a spring part having a curved shape, a junction part formed to an edge part of the spring part and a contact part formed to an opposite edge part of the spring part, wherein the junction part is connected to the first wiring patterns, and the contact part is arranged to an upper area of the junction part,
• wherein the first ground pattern is insulated from the first wiring patterns by a non-variable clearance between the first ground pattern and the entire periphery of the first wiring patterns, and is formed on the first face to surround an entire periphery of respective first wiring patterns, and the spring part of the respective spring terminals extends to an upper area of the first ground pattern surrounding the first wiring patterns,
• wherein a capacitance component is formed between the spring part of the spring terminal and the first ground pattern located in vicinity of the spring part, thereby a characteristic impedance of the spring terminal connected to the first wiring patterns for the signal transmission is adjusted.