Metal member-equipped circuit board, circuit assembly, and electrical junction box

Abstract

A metal member-equipped circuit board includes: a printed circuit board including a through hole; a metal member including a shaft portion that is inserted into the through hole, and a head portion that is arranged outside the through hole, the head portion having a diameter larger than a diameter of the through hole, and a conductive bonding material for bonding the shaft portion and an inner wall of the through hole to each other.

1 . A metal member-equipped circuit board comprising:
 a printed circuit board including a through hole;   a metal member including a shaft portion that is inserted into the through hole, and a head portion that is arranged outside the through hole, the head portion having a diameter larger than a diameter of the through hole, and   a conductive bonding material for bonding the shaft portion and an inner wall of the through hole to each other.   
     
     
         2 . The metal member-equipped circuit board according to  claim 1 , wherein in a state where the shaft portion has been inserted into the through hole, an end face of the shaft portion on the opposite side of the head portion is formed at the same height as a surface of a conductive path on which an electric component of the printed circuit board is mounted. 
     
     
         3 . The metal member-equipped circuit board according to  claim 1 , wherein the bonding material bonds a face of the printed circuit board that is opposed to the head portion and the head portion of the metal member to each other. 
     
     
         4 . The metal member-equipped circuit board according to  claim 1 , wherein an outer circumference of the shaft portion includes:
 a press-fitting portion that is press-fitted into the hole wall of the through hole, and   a non-press-fitting portion that faces the hole wall of the through hole and that is not press-fitted into the hole wall.   
     
     
         5 . A circuit assembly comprising:
 the metal member-equipped circuit board according to  claim 1 ;   an electric component connected to an end face of the shaft portion that is on the opposite side of the head portion;   a heat dissipation member placed on the metal member-equipped circuit board, and   a spacer portion that keeps a space between the printed circuit board and the heat dissipation member.   
     
     
         6 . The circuit assembly according to  claim 5 , wherein the spacer portion is provided in one piece with the heat dissipation member. 
     
     
         7 . An electrical junction box comprising:
 a metal member-equipped circuit board, the metal member-equipped circuit board comprising:
 a printed circuit board including a through hole; 
 a metal member including a shaft portion that is inserted into the through hole, and a head portion that is arranged outside the through hole, the head portion having a diameter larger than a diameter of the through hole, and 
 a conductive bonding material for bonding the shaft portion and an inner wall of the through hole to each other, and 
   a case configured to cover the metal member-equipped circuit board.