Abstract: A connector system (1) is provided with a cable-side connector (10) to be connected to an end part of a cable (11) and a plurality of types of board-side connectors (110, 210) to be connected to a circuit board. The cable-side connector (10) includes a cable-side inner conductor (12), a cable-side outer conductor (13) and a cable-side connector housing (14). Each of the plurality of types of board-side connectors (110, 210) includes a board-side inner conductor (113, 213), a board-side outer conductor (111, 211) and a board-side connector housing (114, 214). The plurality of types of board-side connectors (110, 210) include mutually different board-side outer conductors (111, 211). One board-side connector selected from the plurality of types of board-side connectors (110, 210) is connected to the cable-side connector (10).

Abstract: Lateral cross-sections of first guiding grooves provided in the inner wall surface of an outer cup are formed in a circular arc shape for one point contact with balls, and lateral cross-sections of second guiding grooves provided in the outer wall surface of an inner ring are formed in an elliptic arc shape for two-point contact with the balls. The diameter of a ball and an offset amount between a first and a second groove is set to satisfy the expression of 0.12?V?0.14 with V being the ratio of the two values.

Abstract: Lateral cross-sections of first guiding grooves provided in the inner wall surface of an outer cup are formed in a circular arc shape for one point contact with balls, and lateral cross-sections of second guiding grooves provided in the outer wall surface of an inner ring are formed in an elliptic arc shape for two-point contact with the balls. The diameter of a ball and an offset amount between a first and a second groove is set to satisfy the expression of 0.12?V?0.14 with V being the ratio of the two values.