Assembly of a circuit board and a flexible flat cable, circuit board, and assembling method for a flexible flat cable

A circuit board suitable for assembling with a flexible flat cable, the flexible flat cable including a cable main body and a connection unit extending from one end of the cable main body, the cable main body having a width, the circuit board comprising:

• a board body including a top face, a bottom face, and a side face connected between the top face and the bottom face, the board body being formed with a positioning slot that is formed through the top face and the bottom face and that is spaced apart from the side face, and an opening that extends from the side face to the positioning slot and that is in spatial communication with the positioning slot, the positioning slot being elongated and having a first length, the opening being formed through the top face and the bottom face and having a second length shorter than the first length, the width of the cable main body being greater than the second length, the cable main body being able to pass through the opening to extend through and be positioned in the positioning slot;
• and
• a connection module disposed on the top face of the board body and configured to fix the connection unit and to connect electrically to the connection unit;
• and
• the positioning slot of the board body being disposed between the connection module and the side face, the board body further including a long side that defines one side of the positioning slot adjacent to the connection module, the long side facing toward the opening;
• wherein the board body includes at least one stop arm that faces toward the long side and that is spaced apart from the long side, the stop arm being configured to stop the cable main body;
• and
• wherein the stop arm includes a guiding inclined face that is connected to the side face and that extends slantwise in a direction from the side face toward the long side, the guiding inclined face facing away from the positioning slot for abutting against the cable main body and for guiding entry of the cable main body through the opening.