Patent ID: 7632110

Claim:
An electric junction box comprising: a circuit structure comprising: a circuit board; a circuit element disposed on a first surface of the circuit board; and a plurality of bus bars disposed on a second surface of the circuit board; wherein a portion of each of the plurality of bus bars extends beyond a periphery of the circuit board; and the portion comprises a terminal part; a casing to enclose the circuit structure comprising: a plurality of cavities for accommodating the terminal parts; a heat sink bonded to a bus bar side of the circuit structure; a frame disposed so as to contact said heat sink and surround the circuit structure along the periphery of the circuit board; and a cover attachable to the frame from a side of the circuit structure opposite to the bus bar side; wherein the frame comprises: a first frame member disposed in a first region of the periphery of the circuit board; and a second frame member disposed in a second region of the periphery of the circuit board; wherein the first frame member is attached to the second frame member to substantially encompass the periphery of the circuit board; wherein the first frame member includes a contact surface that the second frame member contacts; wherein the contact surface is located adjacent to a first sealing surface; wherein at least a part of the contact surface comprises a second sealing surface; wherein a sealing agent placed on the first sealing surface is moved during the incorporation of the first member with the second member so as to: (1) seal the second sealing surface, (2) limit an amount of the sealing agent to a small amount and (3) limit an amount of the sealing agent removed by friction when the second sealing surface is sealed with the first sealing surface resulting in a layer of the sealing agent being maintained at a required thickness, thereby achieving an enhanced sealing ability; wherein the first sealing surface is located on the heat sink; and wherein the second sealing surface makes an obtuse angle with the heat sink and the direction of incorporation of the second frame member.