Fixing structure of cable to wiring substrate, and cable, and manufacturing method of cable
A transmission line includes an insulator as a base member, a transmission conductor, and a ground layer. A connector is provided at a wiring substrate to fix the transmission line. The transmission line includes a signal columnar conductor having a solid columnar shape integrated with the transmission conductor, and ground columnar conductors having solid columnar shapes integrated with the ground layer. The connector has a through hole corresponding to the signal columnar conductor, and through holes corresponding to the ground columnar conductors. Conductive films are respectively provided on the inner peripheral surfaces of the through holes. The signal columnar conductor is inserted into the through hole, and the ground columnar conductors are respectively inserted into the through holes.
1. A fixing structure configured to fix a cable to a wiring substrate, the fixing structure comprising:
a cable including a first insulating sheet defining a base member, an elongated transmission conductor configured to transmit a signal, a ground conductor, and a connection conductor; and
a fixing portion provided at the wiring substrate and configured to fix the cable; wherein
the wiring substrate includes at least one land;
the fixing portion includes a plurality of second insulating sheets and at least one conductor;
the plurality of second insulating sheets are connected to the wiring substrate by a conductive joining material;
the connection conductor of the cable is electrically connected with the fixing portion, and the connection conductor of the cable is electrically connected to the at least one land by the at least one conductor of the fixing portion;
the ground conductor is provided closer to the fixing portion side of the base member than the transmission conductor;
the ground conductor includes a ring portion that surrounds a perimeter of the connection conductor when the cable is viewed in a planar view;
the connection conductor and the at least one conductor overlap the at least one land when the plurality of second insulating sheets are viewed in the planar view; and
at least one of the connection conductor of the cable and the at least one conductor of the fixing portion includes at least one protrusion-shaped connection conductor that protrudes from the corresponding one of the cable and the fixing portion and is inserted into the other one of the cable and the fixing portion.
2. The fixing structure according to claim 1 , wherein
the at least one conductor of the fixing portion includes a first interlayer connection conductor connecting to the elongated transmission conductor and a plurality of second interlayer connection conductors connecting to the ground conductor; and
the first interlayer connection conductor is surrounded by the plurality of second interlayer connection conductors when the plurality of second insulating sheets are viewed in the planar view.
3. The fixing structure according to claim 1 , wherein
the first insulating sheet is a thermoplastic resin sheet.
4. The fixing structure according to claim 1 , wherein
the plurality of second insulating sheets are thermoplastic resin sheets.