Circuit board-mounted electrical connector

1. A circuit board-mounted electrical connector comprising:

a circuit board and

an electrical connector which is mounted on a mounting face of said circuit board and to which a counterpart connector component is removably connected such that a front-to-rear direction parallel to said mounting face is a direction of insertion and extraction;

wherein the electrical connector comprises:

a housing which has formed therein a receiving portion that receives, from the rear, the counterpart connector component whose width direction is a direction parallel to the mounting face and perpendicular to the front-to-rear direction, and

terminals, which are retained in place in said housing and which have formed therein contact portions contacting the counterpart connector component inserted into the receiving portion and also have formed therein connection portions connected to the mounting face of the circuit board;

wherein,

within a range of the receiving portion in a plane parallel to the mounting face, the housing further comprises connector-side transmission-permitting portions that permit the transmission of wave signals in the connector-height direction perpendicular to the mounting face;

the circuit board comprises board-side transmission-permitting portions that permit the transmission of wave signals in the connector-height direction at locations corresponding to the connector-side transmission-permitting portions when the electrical connector is mounted; and,

when the counterpart connector component is inserted all the way to a normal position, the transmission of wave signals permitted in the process of insertion of the counterpart connector component becomes blocked by the counterpart connector component, or alternatively, the transmission of wave signals blocked by said counterpart connector component in the process of insertion of the counterpart connector component becomes permissible at the locations of the connector-side transmission-permitting portions and the board-side transmission-permitting portions.

2. The circuit board-mounted electrical connector according to claim 1 , wherein the connector-side transmission-permitting portions are formed as openings passing through the housing in the connector-height direction, and

the board-side transmission-permitting portions are formed as openings passing through the circuit board in the connector-height direction.

3. The circuit board-mounted electrical connector according to claim 1 , wherein the connector-side transmission-permitting portions and the board-side transmission-permitting portions are formed at locations corresponding to the ends of the counterpart connector component in the width direction.

4. The circuit board-mounted electrical connector according to claim 3 , wherein, in a state in which a flat conductor serving as the counterpart connector component, which has formed therein ear portions protruding in the width direction, has been inserted all the way to the normal position, the connector-side transmission-permitting portions and the board-side transmission-permitting portions are formed to be at the same locations as the ear portions, or alternatively, are formed to be at locations to the rear of said ear portions.

5. The circuit board-mounted electrical connector according to claim 1 , wherein the board-side transmission-permitting portions are made larger than the connector-side transmission-permitting portions when viewed in the connector-height direction in a range that includes said connector-side transmission-permitting portions.