JP2006112963A - Mounting structure of substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple mounting structure of a substrate that is superior in waterproofness. <P>SOLUTION: In the mounting structure of the substrate, the substrate 11 is fixed to the inner surface 10a of a case 10 made by die casting via an adhesive 12, a connector 30 is mounted to the case 10, and a land of the substrate 11 is electrically connected to a terminal 32 of the connector 30 via a bonding wire 34. The connector 30 is constituted of a connector housing 31, inside which a plurality of terminals 32 are embedded, the connector housing 31 is fastened and fixed to the outer surface 10b of the metal case 10 interposed with a packing material 36 with a fastening means 35, the base ends 32b of the plurality of terminals 32 of the connector housing 31 are arranged near the land of the substrate 11, and the land of the substrate 11 is electrically connected to the base ends 32b of the plurality of terminals 32 via the bonding wire 34. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a substrate mounting structure in which a land of a substrate attached to a metal case and a terminal of a connector are electrically connected via a bonding wire.

  An example of this type of substrate mounting structure is shown in FIG. 5 (see, for example, Patent Document 1). As shown in FIG. 5, the substrate 2 is fixed to the upper surface 1 a of the metal base 1 with an adhesive 3. A protrusion 1b formed on the upper surface 1a of the metal base 1 is joined with a lower groove 4a made of a resin-like frame-like housing 4 by fitting and bonding, and is formed on the metal base 1 in the frame-like housing 4. A substrate 2 is accommodated.

  The pads (not shown) on the substrate 2 and the terminals 6 of the connector portion 5 of the housing 4 are electrically connected via bonding wires 7. still. The housing 4 is covered with a cover 8.

JP-A-6-109508

  However, since the cover 8 is fitted in the upper groove 4b of the housing 4 in the conventional mounting structure of the substrate 2, the housing 4 (connector portion 5) and the metal base 1 and between the housing 4 and the cover 8 are arranged. It was difficult to take measures against waterproofing.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a board mounting structure that is simple in structure and excellent in waterproofness.

  According to the first aspect of the present invention, a substrate is fixed to an inner surface of a metal case with an adhesive, a connector is attached to the metal case, and a land of the substrate and a terminal of the connector are bonded to a bonding wire. In the mounting structure of the board that is electrically connected via the connector, the connector is fixed to the inner surface in the vicinity of one end of the metal case, and a plurality of terminals are integrally formed by resin insert molding. And a connector housing fixed to the outer surface near the other end of the metal case and having a plurality of terminals embedded therein, the connector housing having an opening formed at the other end of the metal case A fitting fixing part fixed to the outer surface near the other end of the case, and around the opening of the metal case. A packing material that seals both between the surface and the connector housing, and the base end portions of the plurality of terminals of the insert molded product and the connector housing are arranged in the vicinity of the land of the substrate, and The land and the base ends of the plurality of terminals are electrically connected via bonding wires.

  As described above, according to the invention of claim 1, the connector attached to the metal case is fixed to the inner surface near one end of the metal case, and a plurality of terminals are integrally formed by resin insert molding. The insert molded product and a connector housing fixed to the outer surface near the other end of the metal case and embedded with a plurality of terminals are formed on the other end of the metal case. A fitting portion to be fitted into the opened opening and a fastening fixing portion to be fixed to the outer surface near the other end of the case, both between the outer surface around the opening of the metal case and the connector housing And a base material of each of a plurality of terminals of the insert molded product and the connector housing, respectively. By placing the board land and the base ends of the plurality of terminals electrically via bonding wires, the case and the connector can be reliably waterproofed with a simple structure. .

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  1 is a perspective view of a case to which the substrate mounting structure of Embodiment 1 of the present invention is applied, FIG. 2 is a bottom view of the case, FIG. 3 is a sectional view of the case, and FIG. 4 is fixed to the inner surface of the case. It is explanatory drawing which shows the adhesion part of the board | substrate.

  As shown in FIGS. 1 to 4, the case 10 is made of a die-cast aluminum alloy or the like and is formed in a box shape. A printed circuit board (substrate) 11 having a substantially rectangular plate shape is formed at the center of the inner surface 10 a. It is fixed via an adhesive 12. The margin N of the adhesive 12 is provided around the center and the back of the printed circuit board 11 as shown by the hatched lines in FIG. Further, both ends of the connector 20 are fastened and fixed to one end side of the inner surface 10a of the case 10 via screws 25, and a rectangular opening for fitting the connector 30 to the other end side of the case 10 is provided. 10d is formed. The case 10 is used as a lid that forms a control part of an actuator for changing the angle of a variable nozzle of a turbocharger of a diesel engine, for example.

  As shown in FIGS. 2 to 4, the connector 20 includes an insert-molded product 21 having an L-shaped cross section in which middle portions of a plurality of terminals (terminals) 22 are integrally formed by synthetic resin insert molding. Fastening and fixing portions 21a and 21a are formed on both sides of each. A screw (fastening means) 25 is passed through the pair of fastening and fixing portions 21a and 21a, and is screwed into a screw hole (not shown) formed in the inner surface 10a of the case 10 made of die-cast. 10 is fastened and fixed to the inner surface 10a.

  Further, the plurality of terminals 22 are bent in an L shape, and their respective tip portions 22 a are exposed so as to protrude upward from the upper surface of the insert molded product 21. Further, a mating connector for a controlled electrical component (not shown) is fitted into each of the tip portions 22a of the plurality of terminals 22, and for example, power and signals are supplied to the motor side. Yes. Further, the base end portions 22b of the plurality of terminals 22 are exposed on the insert molded product 21, and the base end portions 22b and the bonding pads 23 on the lands 11a formed on the printed circuit board 11 are bonded. It is electrically connected via a wire 24. The bonding wire 24 is an aluminum bonding wire containing nickel.

  As shown in FIGS. 1 to 4, the connector 30 includes a connector housing 31 made of a synthetic resin in which middle portions of a plurality of terminals (terminals) 32 are embedded, and the connector housing 31 is fastened and fixed to a hood portion 31 a. A portion 31b and a fitting portion 31c are provided. The bolts (fastening means) 35 are passed through the fastening and fixing portions 31b of the connector housing 31, and screwed into the screw holes 10c formed in the outer surface 10b of the die-cast case 10 for fastening and fixing. The fitting portion 31 c of the connector housing 31 is fitted into the opening 10 d of the case 10. At this time, between the groove-like recess 10e formed around the opening 10d of the outer surface 10b of the case 10 and the bottom surface of the fastening fixing portion 31b of the connector housing 31, liquid packing or silicon-based elastic adhesive is used. A packing material 36 is interposed to seal between the two.

  Further, the plurality of terminals 32 are formed to be bent in a substantially U-shape, and their respective tip portions 32 a are exposed in the hood portion 31 a of the connector housing 31. Further, an unillustrated external power source or a counterpart connector for a communication system is fitted into each of the tip portions 32a of the plurality of terminals 32. For example, a power source or a signal is supplied from the vehicle side. ing. Furthermore, each base end portion 32 b of the plurality of terminals 32 is exposed in contact with the bottom surface of the fitting portion 31 c of the connector housing 31. The base ends 32b of the plurality of terminals 32 are arranged in the vicinity of the lands 11b formed on the printed circuit board 11, and the base ends 32b and the bonding pads 33 on the lands 11b of the printed circuit board 11 are arranged. Are electrically connected via a bonding wire 34. The bonding wire 34 is an aluminum bonding wire containing nickel.

  As described above, according to the mounting structure of the printed circuit board 11 and the connectors 20 and 30 to the case 10 of the first embodiment, the lands 11a and 11b of the printed circuit board 11 and the terminals 22 and 32 of the connectors 20 and 30 are bonded. By being electrically connected via the wires 24 and 34, the printed circuit board 11 is made to the diecast case 10 by a difference in thermal expansion or vibration between the diecast case 10 and the printed circuit board 11. Even if it moves, the movement and vibration of the printed circuit board 11 can be reliably absorbed by the bonding wires 24 and 34. Thereby, a favorable energization state can always be maintained. Further, the vibration and the like can also be absorbed by the adhesive 12 in which the printed circuit board 11 is fixed to the inner surface 10a of the die-cast case 10. As a result, the case 10 having the mounting structure for the printed circuit board 11 having excellent vibration resistance and insulation can be provided with a simple structure and at a low cost.

  In addition, since the connector 20 is configured by the insert molded product 21 in which the plurality of terminals 22 are integrally formed by synthetic resin insert molding, the shape of the connector 20 can be changed easily and at low cost. Depending on the shape of the changed insert molded product, electrical connection to various controlled electrical components such as various motors can be performed easily and at low cost.

  Further, a packing made of a liquid packing or a silicon-based elastic adhesive or the like between the groove-like recess 10e around the opening 10d of the outer surface 10b of the case 10 and the bottom surface of the fastening fixing portion 31b of the connector housing 31 of the connector 30. By interposing the material 36 and fastening the connector housing 31 to the outer surface 10b of the case 10 via the bolts 35, the gap between the case 10 and the connector 30 can be reliably sealed.

  Further, since it is only necessary to fill the recess 10e around the opening 10d of the outer surface 10b of the case 10 with the packing material 36 made of liquid packing or silicon-based elastic adhesive, the waterproof structure can be simplified. .

  In addition, according to the first embodiment, the case of applying to the case of the actuator for driving the variable nozzle has been described, but it goes without saying that the board mounting structure of the first embodiment can be applied to other cases.

It is a perspective view of the case to which the mounting structure of the board | substrate of Example 1 of this invention is applied. It is a bottom view of the case. It is sectional drawing of the said case. It is explanatory drawing which shows the adhesion part of the board | substrate fixed to the inner surface of the said case. It is sectional drawing which shows the attachment structure of the conventional board | substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 10a Inner surface 10b Outer surface 10d Opening 11 Printed circuit board (board | substrate)
11a land 11b land 12 adhesive 20 connector 21 insert molding 22 terminal 22b base end 24 bonding wire 25 screw (fastening means)
30 Connector 31 Connector housing 31b Fastening fixing part 31c Fitting part 32 Terminal 32b Base end part 34 Bonding wire 35 Bolt (fastening means)

Claims (1)

The substrate is fixed to the inner surface of the metal case via an adhesive, and a connector is attached to the metal case, and the land of the substrate and the terminal of the connector are electrically connected via a bonding wire. In the mounting structure of the circuit board,
The connector is fixed to the inner surface in the vicinity of one end of the metal case, an insert molded product in which a plurality of terminals are integrally formed by resin insert molding, and fixed to the outer surface in the vicinity of the other end of the metal case, A connector housing having a plurality of terminals embedded therein, the connector housing being fitted in an opening formed at the other end of the metal case and in the vicinity of the other end of the case Each of the insert-molded product and the connector housing, with a sealing material interposed between the outer surface around the opening of the metal case and the connector housing. The base end portions of the plurality of terminals are arranged in the vicinity of the land of the substrate, and the land of the substrate and the base ends of the plurality of terminals Mounting structure of the substrate, characterized in that the electrically connected through the bonding wire and.

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