JP6251565B2 - Electronic circuit unit and manufacturing method thereof - Google Patents

Description

  The present invention relates to an electronic circuit unit applied to, for example, an electronic control unit (ECU) of an automobile and a manufacturing method thereof.

  When modularizing a circuit board (printed wiring board, busbar wiring board, etc.) with electronic components as a single electronic circuit unit equipped with connectors, etc., conventionally, it is generally used as a separately molded resin hard case. An electronic circuit unit was obtained by incorporating a circuit board (see Patent Document 1).

JP 2000-134766 A

  However, when the connector terminal provided on the circuit board side is combined with a separately molded hard case connector housing, the adhesion between the connector terminal and the connector housing is not sufficient. For this reason, the fixing support strength of the connector terminal is weakened, and if a strong twisting force is applied when the mating connector is fitted, the support portion of the connector terminal may be damaged. In particular, when a solderless press-fit terminal is used as a connector terminal, there is a problem that the connector becomes vulnerable to bending.

  The present invention has been made in view of the circumstances described above, and an object of the present invention is to securely hold and fix a connector terminal with an outer case, thereby providing an electronic circuit unit having a connector that is resistant to twisting. It is in providing the manufacturing method.

In order to achieve the above-described object, an electric circuit unit according to the present invention is characterized by the following (1) to (3).
(1) The mating space of the mating connector so that the base end portion of the connector terminal is joined to the conductor wiring pattern of the circuit board covered with the outer case formed of the mold resin and surrounds the connector terminal. Is an electronic circuit unit formed integrally with the exterior case,
A back wall portion through which the connector terminal penetrates and is fixed to the base end portion of the connector terminal is integrally formed with the mold resin as a part of the exterior case in the back portion of the fitting space of the connector housing. An electronic circuit unit characterized by comprising:
(2) The connector terminal is a press-fit terminal that is electrically connected to a conductor wiring pattern of the circuit board by press-fitting a base end portion into the circuit board. Electronic circuit unit.
(3) in the circuit board of the base end portion of the connector terminal and the front Kishirube body wiring pattern is bonded portion, and the connector terminal side of the surface, a rear surface opposite to the surface, and the surface the The electronic circuit unit according to (1) or (2) , wherein a side surface connecting the back surface is continuously covered with a mold resin constituting the exterior case.

According to the electronic circuit unit having the above configuration (1), the back wall portion of the connector housing, which is integrally formed of the mold resin as a part of the outer case, is fixed to the connector terminal. The connector terminal can be held and fixed more firmly. Accordingly, even when the mating connector is fitted and an excessive twisting force is applied, the connector terminal can be reliably protected, and damage to the support portion of the connector terminal can be prevented.
According to the electronic circuit unit having the configuration (2), even when a press-fit terminal is used as the connector terminal, the connector terminal can be securely held and fixed, and damage to the support portion of the connector terminal can be prevented. it can.
According to the electronic circuit unit configured as described in (3) above, since the portion where the base end portion of the connector terminal and the circuit board are joined is surrounded by the mold resin, the base end portion of the connector terminal is more firmly fixed. This can more reliably prevent damage to the support portion of the connector terminal.

In order to achieve the above-described object, the method for manufacturing an electric circuit unit according to the present invention is characterized by the following (4).
(4) Bonding the base end portion of the connector terminal extending in the direction intersecting the circuit board to the conductor wiring pattern of the circuit board;
Set the circuit board in the mold,
A method of manufacturing an electronic circuit unit in which an outer case is insert-molded so as to cover the circuit board by filling a cavity in the mold with a molten resin,
When the insert molding is performed, a connector housing having a mating connector fitting space inside is formed integrally with the outer case so as to surround the connector terminal, and at the back of the fitting space of the connector housing, A method of manufacturing an electronic circuit unit, wherein a back wall portion that penetrates the connector terminal and is fixed to a proximal end portion of the connector terminal is integrally formed with the molding resin as a part of the exterior case.

  According to the manufacturing method of the electronic circuit unit having the configuration of (4) above, since the base end portion of the connector terminal is supported by the back wall portion of the connector housing of the exterior case, a solderless prefit terminal is used as the connector terminal. Even in this case, the connector terminal can be more firmly held and fixed by improving the adhesion between the resin and the terminal. Accordingly, even when the mating connector is fitted and an excessive twisting force is applied, the connector terminal can be reliably protected, and damage to the support portion of the connector terminal can be prevented.

  According to the present invention, the back wall portion of the connector housing, which is integrally formed of the mold resin as a part of the outer case, is fixed to the connector terminal, so that the adhesion between the resin and the terminal is improved and the connector terminal is made stronger. Can be held and fixed. Accordingly, even when the mating connector is fitted and an excessive twisting force is applied, the connector terminal can be reliably protected, and damage to the support portion of the connector terminal can be prevented.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is an external perspective view of an electronic circuit unit according to an embodiment of the present invention. 2 (a) to 2 (c) are configuration diagrams of the electronic circuit unit. FIG. 2 (a) is a top view, FIG. 2 (b) is a side view, and FIG. 2 (c) is a bottom view. . 3 is a cross-sectional view taken along arrow III-III in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of the electronic circuit unit of the embodiment, FIGS. 2A to 2C are configuration diagrams of the electronic circuit unit, FIG. 2A is a top view, and FIG. 2 is a side view, FIG. 2C is a bottom view, and FIG. 3 is a cross-sectional view taken along arrow III-III in FIG.

  As shown in FIGS. 1 and 2 (a), 2 (b), and 2 (c), the electronic circuit unit 1 of the present embodiment is mounted with an electronic component 11 and is entirely covered with an outer case 20 made of mold resin. An electronic circuit unit in which a part of the plate surface of the rectangular circuit board 10 is provided with a mold exclusion portion 10A that is exposed from the outer case 20 without being covered with the mold resin, although the back side is covered with the mold resin. It is. As the mold resin, for example, polybutylene terephthalate (PBT), which is an engineering plastic that can exhibit high toughness and heat resistance as an industrial product and is available at low cost, is used. Other engineering plastics can of course be used.

  A cylindrical connector housing 23 constituting a female connector is formed integrally with the outer case 20 of the electronic circuit unit 1. The connector housing 23 protrudes from the surface side of the circuit board 10 in a direction perpendicular to the circuit board 10. In addition, a lid 30 is integrally formed on the outer case 20 so as to be openable and closable so as to integrally cover the mold exclusion portion 10A via a thin hinge 31 positioned at a position far from the connector 2.

  The mold excluding portion 10A of the circuit board 10 collects electronic parts (for example, an electrolytic capacitor, an oscillator, a filter, etc.) 11 that cannot withstand the pressure of the resin during molding when the outer case 20 is injection molded. 10 is a part arranged at one place on the surface side, and is arranged at a position close to the lid 30. The mold exclusion portion 10A is exposed to the outside from the opening 20A provided in the exterior case 20 at the product stage, and the peripheral portion of the opening 20A covers the surface side of the circuit board 10 and the inner surface of the lid body 30. It is formed as a fitting frame portion 22 into which the convex frame portion 32 is fitted.

  Further, as shown in FIG. 1 to FIG. 2C, when the opening 20 </ b> A is closed by the lid 30 at appropriate locations around the opening 20 </ b> A of the exterior case 20, An engagement portion 28 that engages with the lock portion 38 to lock the lid 30 in the closed position is provided. In addition, the lid 30 is provided with a component accommodating portion 35 that can accommodate the head portion when the tall electronic component 11 is mounted on the circuit board 10, for example, so that the mounting height of the entire lid 30 is reduced. It can be done.

  Further, as shown in FIG. 3, the inner layer of the circuit board 10 (including the surface layer of the board as necessary) is made of a plurality of copper foil layers (two layers are schematically shown in FIG. 3 but any number of layers may be used). ) Conductor wiring pattern 12 is provided. In addition, terminals of electronic components (one of which is denoted by reference numeral 11) mounted on the front side or the back side of the circuit board 10 are electrically connected to predetermined conductor wiring patterns 12, respectively.

  Further, at a predetermined portion of the circuit board 10, a base end portion of the connector terminal 15 extending in a direction intersecting with the circuit board 10 (surface side of the circuit board 10) is bonded to the predetermined conductor wiring pattern 12. In this case, as the connector terminal 15, for example, a press-fit terminal that can be easily electrically connected to the conductor wiring pattern 12 by being press-fitted into the circuit board 10 is used.

  As shown in FIG. 3, the connector housing 23 is formed integrally with the outer case so as to surround the connector terminal 15. Thereby, the connector 2 is comprised by the connector housing 23 which has the fitting space 2A of the other party connector inside, and the connector terminal 15 accommodated in the inside. In addition, the connector terminal 15 penetrates into the inner space of the mating connector 2A of the connector housing 23 (the deepest portion in the depth direction of the mating space 2A) and is fixed to the base end of the connector terminal 15. The rear wall portion 24 is integrally formed of mold resin as a part of the outer case 20. Further, the entire portion S where the base end portion of the connector terminal 15 and the circuit board 10 are joined is surrounded by the mold resin constituting the exterior case.

  As described above, the rear wall portion 24 of the connector housing 23 integrally formed of the mold resin as a part of the outer case 20 is fixed to the connector terminal 15 whose base end portion is connected to the circuit board 10. For this reason, the adhesiveness of resin and a terminal can be improved and the connector terminal 15 can be hold | maintained firmly. In addition, since the entire portion S where the base end portion of the connector terminal 15 and the circuit board 10 are joined is surrounded by the mold resin, the connector terminal 15 can be held and fixed more firmly. Therefore, even when the mating connector is fitted and an excessive twisting force is applied, the connector terminal 15 can be reliably protected, and damage to the support portion of the connector terminal 15 can be prevented.

  In particular, when a press-fit terminal is used as the connector terminal 15, the support portion of the connector terminal 15 is fragile because it is solderless, but even in that case, the connector terminal 15 can be securely held and fixed. Therefore, damage to the support portion of the connector terminal 15 can be prevented.

Next, a method for manufacturing the electronic circuit unit 1 (particularly a method for forming the outer case 20) will be described.
When the exterior case 20 of the electronic circuit unit 1 is molded, the connector terminal 15 is mounted in advance on a predetermined portion of the circuit board 10, and the circuit board 10 is placed in the mold 100 indicated by a two-dot chain line in FIG. set. At that time, the mold exclusion portion 10A is exposed from the opening 100A of the mold 100 to the outside (or even in the mold 100, a non-cavity space secured under a condition not filled with resin). Then, molten resin is filled into the cavity (the space filled with the resin constituting the outer case 20 in FIG. 3) in the mold 100, and the outer case 20 is insert-molded.

  By doing so, the back wall portion 24 of the connector housing 23 that holds and fixes the base end portion of the connector terminal 15 is integrally formed, and the entire portion S where the base end portion of the connector terminal 15 and the circuit board 10 are joined is provided. Can be molded, and the electronic circuit unit 1 in which the circuit board 10 is covered with the exterior case 20 can be obtained.

  In addition, since the back side of the mold exclusion part 10A is to be covered with a resin, the cavity forming this part (the back wall 20B of the mold exclusion part) is also filled with the molten resin. The excluded portion 10A is not filled with molten resin.

  Therefore, the force acting on the front surface side and the back surface side of the circuit board 10 becomes unbalanced, so that when the molten resin is filled, the circuit board 10 of the mold excluding portion 10A has the surface side from the back surface side by the pressure of the resin. The force toward is applied. If this force acts excessively, the circuit board 10 may be deformed, and the conductor wiring pattern 12 on the inner layer of the circuit board 10 may be damaged.

  When there is such a possibility, as a countermeasure, for example, a method of suppressing the deformation of the circuit board 10 by pressing the surface side of the circuit board 10 of the mold exclusion portion 10A with a pressing member at the time of injection molding is adopted. Can do. Moreover, the method of reinforcing the weak part of the conductor wiring pattern 12 of the inner layer of the mold exclusion part 10A so that the elastic coefficient becomes a certain value or more can be adopted. Or the method of shape | molding the back wall of the exterior case 20 of the back side of the mold exclusion part 10A with resin with higher fluidity than another part can be taken. By taking such a measure, it is possible to prevent the conductor wiring pattern 12 from being damaged by suppressing the deformation of the circuit board 10 of the mold exclusion portion 10A during the injection molding.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

Here, the features of the embodiments of the electronic circuit unit and the manufacturing method thereof according to the present invention described above are briefly summarized and listed in the following (1) to (4), respectively.
(1) A base end portion of a connector terminal (15) is joined to a conductor wiring pattern (12) of a circuit board (10) covered with an outer case (20) formed of a mold resin, and the connector terminal A connector housing (23) having a mating connector fitting space (2A) inside so as to surround the electronic connector unit (1) formed integrally with the outer case,
A back wall portion (24) through which the connector terminal penetrates and is fixed to the base end portion of the connector terminal is integrally formed with the mold resin as a part of the exterior case in the back portion of the fitting space of the connector housing. An electronic circuit unit characterized by being formed.
(2) The connector terminal is a press-fit terminal that is electrically connected to a conductor wiring pattern of the circuit board by press-fitting a base end portion into the circuit board. Electronic circuit unit.
(3) The portion (S) where the base end portion of the connector terminal and the conductor wiring pattern of the circuit board are joined is surrounded by a mold resin constituting the exterior case (1) Or an electronic circuit unit according to (2).
(4) The base end of the connector terminal (15) extending in the direction intersecting the circuit board (10) is joined to the conductor wiring pattern (12) of the circuit board,
Set the circuit board in the mold (100),
A method of manufacturing an electronic circuit unit in which an outer case (20) is insert-molded so as to cover the circuit board by filling a molten resin in a cavity in the mold,
When insert molding is performed, a connector housing (23) having a mating connector fitting space (2A) inside is formed integrally with the outer case so as to surround the connector terminal, and the connector housing is fitted. A back wall portion (24), which penetrates the connector terminal and is fixed to a base end portion of the connector terminal, is formed integrally with the molding resin as a part of the exterior case. Manufacturing method of electronic circuit unit.

DESCRIPTION OF SYMBOLS 1 Electronic circuit unit 2 Connector 2A Fitting space 10 Circuit board 15 Connector terminal 20 Exterior case 23 Connector housing 24 Back wall part 100 Mold S The part where the base end part of the connector terminal and the circuit board were joined

Claims (4)

The base end of the connector terminal is joined to the conductor wiring pattern of the circuit board covered with the exterior case formed of the mold resin, and the mating space of the mating connector is set inside so as to surround the connector terminal. A connector housing having an electronic circuit unit formed integrally with the outer case,
A back wall portion through which the connector terminal penetrates and is fixed to the base end portion of the connector terminal is integrally formed with the mold resin as a part of the exterior case in the back portion of the fitting space of the connector housing. An electronic circuit unit characterized by comprising: 2. The electronic circuit unit according to claim 1, wherein the connector terminal is a press-fit terminal that is electrically connected to a conductor wiring pattern of the circuit board by press-fitting a base end portion into the circuit board. 3. . In the circuit board portion where the base end portion of the connector terminal and the front Kishirube body wiring pattern is joined, and the connector terminal side of the surface, a rear surface opposite to the surface, and the back and the surface The electronic circuit unit according to claim 1 , wherein the connecting side surfaces are continuously covered with a mold resin that constitutes the exterior case. Bonding the base end of the connector terminal extending in the direction intersecting the circuit board to the conductor wiring pattern of the circuit board,
Set the circuit board in the mold,
A method of manufacturing an electronic circuit unit in which an outer case is insert-molded so as to cover the circuit board by filling a cavity in the mold with a molten resin,
When the insert molding is performed, a connector housing having a mating connector fitting space inside is formed integrally with the outer case so as to surround the connector terminal, and at the back of the fitting space of the connector housing, A method of manufacturing an electronic circuit unit, wherein a back wall portion that penetrates the connector terminal and is fixed to a proximal end portion of the connector terminal is integrally formed with the molding resin as a part of the exterior case.

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