JP2007103630A - Electronic circuit unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent circuit boards from being broken due to stress on the circuit boards by contraction when a resin is hardened, concerning an electronic circuit unit to be obtained by storing an electronic circuit configuration body which is configured by attaching electronic components and connectors to the circuit boards, inside a case and casting the resin in the case. <P>SOLUTION: The electronic components required to configure an electronic circuit are attached by division to the plurality of circuit boards 2A, 2B. Connectors 3A, 3B to be directly mounted on the boards are attached to one side of each circuit board. A flexible wiring member 8 electrically connects the circuit boards. Each one side of the circuit boards 2A, 2B is fixed to one of the side walls of the case 6 via the connectors 3A, 3B. The other three sides of each circuit board are not fixed to the side walls of the case 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic circuit unit having a structure in which a circuit board on which electronic components constituting an electronic circuit are mounted is accommodated in a case and resin is cast in the case.

  As an electronic circuit unit constituting a control unit (ECU) for controlling an engine or the like, a box-shaped case is used for the exterior of the unit, and a connector is attached to the side wall of the case.

  In this type of electronic circuit unit, an electronic component necessary for configuring an electronic circuit and a board direct-connecting connector to which a mating connector is connected when the electronic circuit is connected to an external circuit are connected to a printed circuit board or the like. The electronic circuit component is assembled by being attached to the circuit board, and the electronic circuit component is accommodated in a box-shaped case made of synthetic resin.

  In this case, the electronic circuit component is housed in the case in a state in which the board-mounted connector is fixed to the side wall of the case and led out to the outside. In order to give weather resistance to the unit, a resin mold part is formed by casting resin in the case, and a mold required part (a part that needs to be molded) of the electronic circuit component is molded by this resin mold part. I am doing so.

  This type of electronic circuit unit is shown, for example, in FIG. An example of an electronic circuit unit configured by the prior art described in Patent Document 1 is shown in FIGS. 12 is a top view of the unit before resin casting, FIG. 13 is a front view of the unit, FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 12, and FIG. It is the side view which notched and showed the state which carried out.

  In the electronic circuit unit shown in FIGS. 12 to 15, electronic components 1a to 1e and the like necessary for constituting an electronic circuit are attached to a single circuit board 2 'formed in a rectangular shape. In addition, board-direct-connecting connectors 3A 'and 3B' to which a mating connector is connected when an electronic circuit is connected to an external circuit are attached to the circuit board 2 '.

  The board-mounted connector is a connector that is directly attached to a circuit board, and is also called a direct coupler. Each of the board-mounted connectors includes, for example, a connector housing 301 ′ having a portion to which the mating connector is connected on the front surface 301a ′ side, and a plurality of contacts (not shown) accommodated in the connector housing 301 ′. And a plurality of L-shaped lead terminals 302 ′ connected to the plurality of contacts and projecting outward from the back surface 301 b ′ of the connector housing 301 ′. The end portion is placed on a portion near the end portion on one side of the circuit board 2 ′, and the respective leading ends of the plurality of lead terminal portions 303 ′ are inserted into through holes provided in the circuit board 2 ′ to thereby form electrodes on the circuit board. It is attached to the circuit board 2 'by soldering to the part.

  The circuit board 2 ', the electronic components 1a to 1e attached to the circuit board 2', and the connectors 3A 'and 3B' constitute an electronic circuit component 4 '. The electronic circuit component 4 'is accommodated in a box-shaped case 6' having four side walls 601 'to 604' and a bottom wall portion 605 '. Arm portions 606 ′ and 607 ′ are provided on the outer sides of the opposite side walls 601 ′ and 602 ′ of the case 6 ′, which are fastened to the attachment locations by bolts when the electronic circuit unit is attached to the predetermined attachment locations. .

  In the illustrated example, notches 608A 'and 608B' are provided in one side wall 603 'of the case 6', and are provided on the side surfaces of the respective housings 301 'of the board-mounted connectors 3A' and 3B '. The circuit board 2 to which the electronic components and the connector are attached in a state where the edges of the notches 608A ′ and 608B ′ are inserted into the grooves and the connectors 3A ′ and 3B ′ are fitted into the notches 608A ′ and 608B ′. 'Is accommodated in the case 6'.

  As a result, the electronic circuit component 4 'exposes the front surface (portion to which the mating connector is connected) 301a' of the housing 301 'of the connectors 3A' and 3B 'to the outside of the case 6' and the side wall of the case 6 '. The connectors 3A 'and 3B' are fixed to the case 604 'and housed in the case. The dimensions of the case 6 ′ are such that a gap g (see FIGS. 12 and 14) is formed between the circuit board 2 ′ and the inner surface of the case 6 ′ with the circuit board 2 ′ inserted into the case. Is set.

Then, as shown in FIG. 15, resin is poured (cast) into the case 6 'and cured to form a resin mold portion 7' in the case 6 '. The required mold part (portion that needs to be molded) of the circuit component 4 'is molded. In the example shown in the drawing, a tall component (for example, a capacitor) 1d attached to the circuit board is covered with a waterproof exterior among the elements constituting the electronic circuit structure, and the end portion is not necessarily molded. Since it is not necessary, in order to save the mold resin, the resin mold portion 7 'is formed so that the end portion of the component 1d away from the substrate is exposed to the outside.
JP 2004-92598 A (FIG. 3)

  As described above, with the board-mounted connector attached to the end of the circuit board fixed to the side wall of the case and led out to the outside, the electronic circuit component is accommodated in the case and poured into the case. In the electronic circuit unit in which the required mold part of the electronic circuit component is molded with the molded resin, the resin shrinks when the resin is cast and cured in the case, so that the case sinks (shrinks) The side wall of the case is displaced inward. Therefore, if the connector attached to the circuit board is fixed to the side wall of the case, a force acts on the circuit board from the side wall of the case through the connector when sink marks occur in the case.

  When the connector is attached to only one side of the circuit board 2 'and fixed to one side wall 603' of the case 6 'as in the example shown in FIGS. Even if the resin casted in ′ is cured when sinking occurs in the case 6 ′ and a force acts on the circuit board 2 ′ from the side wall 604 ′ of the case 6 ′, the circuit board 2 ′ escapes to the side wall 604 ′ side. Therefore, there is no possibility that the circuit board is damaged.

  On the other hand, a connector is also attached to the other side of the circuit board 2 ', for example, the side opposite to the side where the connectors 3A' and 3B 'are attached in the above example, and the side walls 603' and 604 of the case 6 'are attached. If the connector is fixed to both sides of the circuit board 2 'when the resin cast in the case is cured, the case 6' sinks and the side walls 603 'and 604' are displaced toward each other. Since a compressive force is applied along the plate surface to apply a large stress to the circuit board, the circuit board may be damaged.

  In addition, when the case 6 'is formed of a metal material such as aluminum, there is almost no sink in the case when the resin cast in the case is cured, but in this case as well, two or more sides of the circuit board 2' If the connector is attached to the circuit board, when the circuit board expands and contracts as the temperature changes, a large stress is applied to the circuit board, and the circuit board may be damaged in the same manner as described above.

  Therefore, in this type of conventional unit, when it is necessary to attach a connector only to one side wall of the case and to lead out the wiring to connect to the external circuit from the other side wall of the case, do not use the connector. The cord connected to the circuit board is directly pulled out through the grommet attached to the case.

  However, when the circuit board is accommodated in the case, it is troublesome to pull out the cord through the grommet attached to the case, so that the connector attached to the circuit board can be led out through two or more side walls of the case. It is hoped that. In particular, in an engine control unit, as the number of controlled objects increases, the number of signal lines drawn from the unit tends to increase. Therefore, it is necessary to make it possible to lead out connectors from a plurality of side walls of the unit case. desirable. Although it is conceivable to derive a large number of connectors from one side wall of the case, such a configuration is not preferable because the case becomes large.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic circuit unit in which an electronic circuit component formed by attaching electronic components and connectors to a circuit board is housed in a case and resin is cast in the case. An object of the present invention is to allow the shaped connector to be led out through two or more side walls of the case.

  The present invention provides a circuit board on which electronic components necessary for constituting an electronic circuit are attached, and a plurality of connectors to which a counterpart connector is connected when an electronic circuit is connected to an external circuit attached to an end of the circuit board. The present invention relates to an electronic circuit unit including an electronic circuit component having a board direct-connecting connector and a box-shaped case containing the electronic circuit component. In the electronic circuit unit to which the present invention is directed, the electronic circuit component is housed in the case in a state where each of the board-mounted connectors is fixed to the side wall of the case and led out to the outside. The required mold part of the electronic circuit component is molded by a resin mold part formed of the resin formed.

  In the present invention, two or more circuit boards are provided, and electronic components necessary for constituting an electronic circuit are separately attached to the two or more circuit boards. Among the circuit boards to which electronic components are attached, two or more circuit boards are used as connector mounting circuit boards, and at least one board-mounted connector is attached to one side of each connector mounting circuit board.

  In addition, at least two side walls of the case are used as connector lead-out side walls, a board direct-attached connector attached to one of the connector mounting circuit boards is led out from each connector lead-out side wall, and resin is cast into the case. The dimensions of the case are set such that a gap is formed between the other side of each connector mounting circuit board other than the one side and the side wall of the case in a state before the connection.

  That is, a connector is attached to only one side of each connector mounting circuit board, and each side of the connector mounting circuit board to which the connector is attached is fixed to the side wall of the case via the connector.

  As described above, the electronic components necessary for configuring the electronic circuit are divided and attached to two or more circuit boards, and the wiring member having flexibility between the circuits respectively formed on the two or more circuit boards And at least two circuit boards are used as connector mounting circuit boards, and a board-mounted connector is attached to only one side of each connector mounting circuit board, and one side of each connector mounting board is attached. If only the connector is fixed to the side wall of the case via the connector, the other side other than the side to which the connector of each circuit board to which the connector is attached is not directly fixed to the side wall of the case. When the resin cast in the case hardens, the case shrinks as the resin shrinks, or when the circuit board expands and contracts due to a temperature change. Great stress from the scan side wall of each circuit board can be prevented according to the. Therefore, if comprised as mentioned above, a connector can be derived | led-out from the several side wall of a case, without producing a possibility of damaging a circuit board.

  The plurality of circuit boards can be arranged in a state in which the respective plate surfaces face each other in a direction perpendicular to the bottom surface of the case.

  The plurality of circuit boards can also be arranged in a state of being planarly arranged along a plane parallel to the bottom surface of the case.

  In a preferred aspect of the present invention, two circuit boards are provided, and each of the two circuit boards is a connector mounting circuit board. Further, the board direct-connecting connector includes a connector housing having a portion to which a mating connector is connected on the front side, a plurality of contacts accommodated in the connector housing, and a connector housing connected to the plurality of contacts, respectively. A plurality of L-shaped lead terminals projecting outward from the back surface of the board, the connector housing being mounted on a portion near the end of the corresponding circuit board, and the tip of the plurality of lead terminal sections being attached to the corresponding connector It is attached to the corresponding connector mounting circuit board in a state of being soldered to the circuit board. In this case, the two circuit boards for mounting the connector are arranged in a state in which the surface on which the respective board direct-mounting connectors are mounted faces the opening side of the case. The two side walls of the case are used as connector lead-out side walls, and a notch for fitting a part of the connector housing of the board direct-attached connector to be led out into each of the two connector lead-out side walls. It is formed in an open state in the opening direction.

  The board direct-attached connectors respectively attached to the two connector mounting circuit boards are connected to the case 2 in a state in which a part of each connector housing is fitted into the notches provided in the two side walls of the case. Fixed to two side walls. Also, the resin mold part is parallel to the bottom wall part of the case at a position where it can completely cover the lead terminals of the board-mounted connector attached to the circuit board for connector attachment arranged on the side close to the bottom wall part of the case. A first mold portion having a smooth resin surface and a connector mounting circuit board formed so as to have a resin surface inclined with respect to the bottom wall portion of the case and disposed on the side close to the opening of the case And a second mold portion that covers a portion of the lead terminal of the directly mounted board connector that is not covered by the first mold portion.

  When the two circuit boards are arranged with their positions shifted in the opening direction of the case, the connectors attached to the respective circuit boards are arranged at different positions from the bottom surface of the case. In this case, holding the case in a horizontal state and trying to inject resin into the case until it completely covers the lead terminals of the connector with the higher height from the bottom of the case, the height from the bottom of the case Because the resin leaks from the notch where the lower connector is fitted, attach a member to the case that closes the notch where the lower connector from the bottom of the case is fitted. Is necessary and cumbersome.

  On the other hand, as described above, the resin mold portion, the first mold portion provided to completely cover the lead terminal of the connector attached to the circuit board on the side close to the bottom wall portion of the case, The first mold part of the lead terminal of the board direct-connecting connector formed on the circuit board disposed on the side close to the opening of the case, which is formed to have a resin surface inclined with respect to the bottom wall part of the case When the resin mold part is constituted by the second mold part covering the part not covered with the case, the case is held in a horizontal state and the resin is injected into the case to form the first mold part. Since the resin mold part can be formed simply by injecting resin into the case in a tilted state to form the second mold part, the resin can be formed without taking measures to close the notch in the case. Rudo portion can be formed easily.

  As the wiring member, a flexible printed board in which a wiring conductor is provided on a flexible substrate material, or a wiring material such as a flexible (flexible) lead wire can be used. In order to reduce the number of points, simplify the configuration, and facilitate wiring automation, it is preferable to use a flexible printed circuit board.

  As described above, according to the present invention, since each circuit board to which the connector is attached is fixed to only one side wall of the case via the connector, the resin cast in the case is cured. If the case shrinks due to resin shrinkage, or if the circuit board expands or shrinks due to temperature change, it can prevent the circuit board from being subjected to great stress from the side wall of the case. it can. Therefore, the connector can be led out from the plurality of side walls of the case without causing the possibility of damaging the circuit board.

  Further, according to the present invention, since the connector can be attached to a plurality of side walls of the case, if the number of connectors is the same, the size of the case can be reduced as compared with the conventional case and the unit can be miniaturized.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 to FIG. 8 show a first embodiment of the present invention. FIG. 1 is a plan view showing a state before the resin casting of the first embodiment of the electronic circuit unit according to the present invention. 2 is a front view of the electronic circuit unit shown in FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIG. 4 is a bottom view showing a state in which resin is cast in the case of the unit in FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view for explaining a method of forming the second mold portion in the case of the unit of FIG. 1, and FIG. 7 is a diagram showing a connector, a wiring member, FIG. 8 is a side view showing a state in which an electronic circuit is attached to the circuit board shown in FIG. 7 and then the circuit board is divided into two and bent.

  In the electronic circuit unit of this embodiment, as shown in FIGS. 1 to 3, two rectangular circuit boards 2A and 2B having a sufficient thickness to maintain self-supporting properties are provided. The electronic components 1a to 1g and the like necessary for configuring the electronic circuit are attached to the two circuit boards 2A and 2B. In addition, board-direct-connecting connectors 3A and 3B to which mating connectors are connected when an electronic circuit is connected to an external circuit are attached to each side of the circuit boards 2A and 2B. The circuit boards 2A and 2B are obtained by forming wiring patterns and terminal electrodes on one side or both sides of a board made of an insulating material, and printed circuit boards can be used as these circuit boards. In the present embodiment, both circuit boards 2A and 2B are used as connector mounting boards.

  Each board direct-attached connector is the same as that used in the prior art, and is housed in a connector housing 301 having a portion to which the mating connector is connected on the front surface 301a side, and the connector housing 301. It has a plurality of contacts (not shown) and a plurality of L-shaped lead terminals 302 connected to the plurality of contacts and projecting outward from the back surface 301 b of the connector housing 301. In the present embodiment, the connector 3A is configured to be larger than the connector 3B.

  The connectors 3A and 3B are arranged in a state in which a base portion 301c formed at an end portion on the back side of each connector housing 301 is placed on a portion near the end portion on each side of the circuit boards 2A and 2B, respectively. The base portion 301c of the connector housing is fastened to the circuit boards 2A and 2B with screws or the like, and the leading ends of the lead terminal portions 302 provided respectively are inserted into predetermined through holes provided in the circuit boards 2A and 2B. The circuit boards 2A and 2B are attached to one side of each of the circuit boards 2A and 2B by being soldered to the electrode portions of the circuit boards 2A and 2B.

  The circuits formed on the two circuit boards 2 </ b> A and 2 </ b> B are connected to each other through the flexible wiring member 8. The illustrated wiring member 8 is a flexible printed board in which a necessary number of wiring conductor patterns extending parallel to each other are provided on a flexible board by printing or the like, and one end of the series of wiring conductor patterns of the wiring member 8 is the circuit board 2A. The other end of the series of wiring conductor patterns of the wiring member 8 is soldered to the electrode portion formed at the end of the back surface of the circuit board 2B.

  The circuit boards 2A and 2B, the electronic components 1a to 1g attached separately to these circuit boards, the connectors 3A and 3B attached to the circuit boards 2A and 2B, and the circuit boards 2A and 2B, respectively. The electronic circuit component 4 is constituted by the wiring member 8 for connecting the formed circuits.

  The electronic circuit component 4 is accommodated in a box-shaped case 6 having four side walls 601 to 604 and a bottom wall portion 605. Arms 606 and 607 that are fastened to the attachment locations by bolts when the electronic circuit unit is attached to a predetermined attachment location are provided on the outside of the opposite side walls 601 and 602 of the case 6. The case 6 is made of, for example, PBT (polybutylene terephthalate).

  In the illustrated example, two opposite side walls 603 and 604 of the case 6 are used as connector lead-out side walls, and the connector housings of the connectors 3A and 3B to be led out are connected to the two connector lead-out side walls 603 and 604, respectively. Notches 608A and 608B for fitting a part of 301 are formed in a state of penetrating through the side walls 603 and 604 of the case and opening in the opening direction of the case 6. In this example, the notch 608A is formed deeper than the notch 608B, and the bottom 608B1 of the notch 608B is disposed at a position closer to the opening side of the case 6 than the bottom 608A1 of the notch 608A.

  The circuit boards 2A and 2B are accommodated in the case 6 with their plate surfaces facing each other in a direction perpendicular to the bottom surface of the case 6, and connectors 3A and 3B attached to the circuit boards 2A and 2B, respectively. The connectors 3A and 3B are fixed to the two side walls 603 and 604 of the case 6 with the edges of the notches 608A and 608B inserted in the grooves provided on the side surfaces of the respective housings 301.

  In the illustrated example, the circuit board 2A arranged on the side close to the bottom wall portion 605 of the case has one end to which the connector 3A is attached fixed to the side wall 603 of the case via the connector 3A, and the connector 3A An end opposite to the attached end is held in a state of being placed on a support protrusion 610 (see FIG. 3) integrally formed on the bottom of the case.

  The circuit board 2B disposed on the side away from the bottom wall 605 of the case 6 (side close to the opening of the case) is attached to the circuit board 2A with a predetermined gap (circuit boards 2A and 2B, respectively). It is arranged in a state where a gap that can prevent the parts from contacting each other is interposed, and is supported by the side wall 604 of the case in a cantilever manner via the connector 3B. Before the resin is cast into the case, the side walls 603 and 604 of the circuit board 2A and 2B are fixed to the side walls 603 and 604, respectively, to prevent the sides from being restrained by the side walls of the case. In this state, the dimensions of the case 6 are set so that a gap g is formed between the three sides other than the one side to which the connector of each circuit board is attached and the side wall of the case.

  As described above, also in the present invention, the electronic circuit component 4 exposes the front surface (portion to which the mating connector is connected) 301a of the housing 301 of each of the connectors 3A and 3B to the outside of the case 6, and the case 6 The side walls 603 and 604 are housed in the case with the connectors 3A and 3B fixed thereto.

  When component parts of an electronic circuit are mounted separately on the two circuit boards (connector mounting circuit boards) 2A and 2B, necessary parts are attached to the circuit board in which the circuit boards 2A and 2B are integrated. It is preferable to take a method of separating both circuit boards later.

  For example, as shown in FIG. 7, first, a circuit board 2 in a form in which circuit boards 2A and 2B are first integrally connected by connecting portions 201 and 202 is prepared, and electronic circuit components 4 are respectively attached to the circuit boards 2A and 2B. Predetermined electronic components and connectors 3A and 3B necessary for constructing are attached. The circuits formed on the circuit boards 2A and 2B are connected to each other through a wiring member 8 made of a flexible printed board.

  The circuit board 2 shown in FIG. 7 is a rigid board (having hardness) having a surface to be the surface of the circuit board 2A and a surface to be the back surface of the circuit board 2B on the same plane. An electrode portion 203 for soldering one end of the wiring member 8 is formed at the end of the portion constituting the circuit board 2B side. Further, an electrode portion 204 for soldering the other end of the wiring member 8 is formed at an end portion on the circuit board 2A side of a portion constituting the circuit board 2B.

  Necessary components are attached to the circuit boards 2A and 2B, and the circuit boards are electrically connected to each other through the wiring member 8. Then, the connecting portions 201 and 202 that connect the circuit boards are connected at the cutting line 205. The circuit boards 2A and 2B are separated by separating from the boards 2A and 2B. Thereafter, as shown in FIG. 8, the wiring member 8 is folded and the circuit boards 2 </ b> A and 2 </ b> B are opposed to each other to form the electronic circuit component 4, and the electronic circuit component 4 is inserted into the case.

  7 and 8, illustration of electronic components attached to the circuit boards 2A and 2B, respectively, is omitted.

  As described above, when necessary electronic components are attached to a single circuit board 2, and then the circuit board 2 is divided into two circuit boards 2A and 2B, the electronic components are individually attached to the two circuit boards. Electronic components can be attached more efficiently than in the case.

  In the example shown in FIG. 7, the electrode portions 203 provided on the circuit boards 2 </ b> A and 2 </ b> B, respectively, using the rigid substrate 2 having a structure in which the circuit board 2 </ b> A and the circuit board 2 </ b> B are connected by the connecting portions 201 and 202. And 204 are connected by a wiring member made of a flexible substrate, but the present invention is not limited to the case where an electronic circuit component is configured by such a method.

  For example, a circuit board (rigid flexible board) having a structure in which a plurality of rigid circuit boards and a flexible board provided so as to connect these circuit boards are integrated from the beginning is used. An electronic circuit component may be configured by attaching necessary electronic components. When such a circuit board is used, the connecting portions 201 and 202 and the electrode portions 203 and 204 shown in FIG. 7 are not necessary.

  In other words, in the present invention, the flexible board constituting the wiring member for connecting the plurality of circuit boards may be provided separately from the plurality of circuit boards, and in a state of being integrated with the plurality of circuit boards. It may be provided. The wiring member may not be a flexible substrate, and may be composed of a plurality of lead wires, a flat cable in which a large number of electric wires are arranged and integrated, or the like.

  After the electronic circuit component 4 is inserted into the case 6 as described above, resin is cast into the case 6 to form the resin mold portion 7. The resin mold portion 7 of the present embodiment has a case in a position where the lead terminal 302 of the board direct-connecting connector 3A attached to the circuit board 2A disposed on the side close to the bottom wall portion 605 of the case 6 can be completely covered The first mold part 7A having a resin surface 701 parallel to the bottom wall part 6 of the battery 6 and the resin surface 702 inclined with respect to the bottom wall part 605 of the case 6 are formed and close to the opening part of the case 6. And a second mold part 7B that covers a portion of the lead terminal 302 of the board direct-connecting connector 3B that is attached to the circuit board 2B disposed on the side that is not covered by the first mold part 7A. . For example, a urethane resin can be used as the resin constituting the first mold part 7A and the second mold part 7B.

  As described above, when the two circuit boards 2A and 2B are arranged so as to be shifted in the opening direction of the case 6, the connectors 3A and 3B respectively attached to the circuit boards 2A and 2B The height from the bottom surface is arranged at a different position. In this case, if the case 6 is held in a horizontal state and resin is to be injected into the case until the lead terminal 302 of the connector 3B having a higher height from the bottom surface of the case 6 is completely covered, The resin leaks out from the notch 608A in which the connector 3A arranged at a position close to the bottom wall portion is fitted. In order to prevent this, a member that closes the notch 608A into which the connector 3A on the side close to the bottom wall portion of the case 6 is fitted may be attached to the case. However, providing such a member increases the number of parts. It is not preferable.

  On the other hand, when the resin mold part 7 is formed by the first mold part 7A and the second mold part 7B as in the present embodiment, the case 6 is first held in a horizontal state, After the resin is injected into the first mold portion 7A, the case 6 is placed on a jig 9 having an inclined surface 9a on the upper surface as shown in FIG. 6, and the connector 3B is placed below the connector 3A. The resin mold part 7 can be formed simply by injecting a resin into the case 6 and forming the second mold part 7B in a state where the case 6 is inclined so as to be positioned at the position.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, three circuit boards 2A to 2C are provided, and electronic components necessary for configuring an electronic circuit are separately attached to these three circuit boards. The circuit boards 2A to 2C are used as connector mounting circuit boards, and the board direct-attached connectors 3A to 3C are attached to the respective sides of the circuit boards 2A to 2C. The circuit formed on the circuit board 2A and the circuit formed on the circuit board 2B are connected via a wiring member 8a made of a flexible printed board, and the circuit formed on the circuit board 2B and the circuit board 2C are formed. Are connected to each other through a wiring member 8b made of a flexible printed circuit board. An electronic circuit component 4 is composed of the circuit boards 2A to 2C and the electronic components and connectors attached to these circuit boards.

  Further, the side walls 603 and 604 of the case 6 are used as connector drawing-out side walls, and notches 608A and 608B are formed at opposite positions near the side wall 602, respectively. A notch 608C is formed in the portion.

  In this example, three circuit boards 2A to 2C are accommodated in the case 6 in a state where they are arranged in a plane along a plane parallel to the bottom surface of the case. More specifically, the circuit boards 2A and 2B have a width dimension smaller than 1/2 of the interval between the side walls 603 and 604 of the case 6 and 1/2 of the interval between the side walls 601 and 602 of the case 6. The circuit board 2C has a length dimension slightly smaller than the distance between the side walls 603 and 604 of the case and between the side walls 601 and 602 of the case 6. It is formed so as to have a width dimension corresponding to approximately ½ of the interval.

  The circuit boards 2A and 2B to which electronic components and connectors are attached are arranged side by side between the portions of the side walls 603 and 604 of the case 6 where the cutouts 608A and 608B are formed, and the connectors 3A and 3B are cut out. It is fitted to 608A and 608B.

  The circuit board 2C to which the electronic components and the connector 3C are attached is disposed between the circuit boards 2A and 2B and the side wall 601 of the case, and the connector 3C is fitted into the notch 608C of the side wall 603 of the case. . The dimensions of the case 6 are set such that a gap g is formed between the circuit board 2 and the inner surface of the case 6 in a state where the circuit boards 2A to 2C are inserted into the case 6.

  Resin is cast into a case 6 in which circuit boards 2A to 2C to which electronic components are attached are inserted, and a resin mold portion 7 is formed as shown in FIG. 11, and the electronic circuit component 4 is formed by the resin mold portion. The required mold part is molded.

  In the above embodiment, the board direct-attached connector is attached to all of the plurality of circuit boards to which the electronic parts necessary for the configuration of the electronic circuit are attached. However, some of the circuit boards are used only for attaching the electronic parts. It may be. For example, in FIG. 9, the circuit board 2C may be used only for attaching electronic components. In that case, the circuit board 2C to which no connector is attached is located above the connector mounting circuit boards 2A and 2B (on the opening side of the case from the circuit boards 2A and 2B) or below (on the bottom wall side of the case from the circuit boards 2A and 2B). If it arrange | positions to, case 6 can be comprised compactly.

  In each of the above embodiments, only the two opposite side walls 603 and 604 of the case are used as connector leading side walls, and the connector is attached only to these side walls. However, the three side walls or four side walls of the case are connected to the connector. It can also be used as a side wall. In that case, at least the number of connector mounting circuit boards is provided as many as the number of connector deriving side walls, and the connector attached to one of the connector mounting circuit boards is fixed to each connector deriving side wall. A gap is formed between the other three sides other than the one to which the connector of each connector mounting circuit board is attached and the side wall of the case before the resin is cast into the case. deep.

It is the top view which showed the state before resin casting of 1st Embodiment of the electronic circuit unit concerning this invention. It is a front view of the electronic circuit unit shown in FIG. It is the III-III sectional view taken on the line of FIG. It is a bottom view which shows the state which cast resin in the case of the unit of FIG. It is the VV sectional view taken on the line of FIG. It is sectional drawing explaining the method of forming a 2nd mold part in the case of the unit of FIG. It is the top view which showed the circuit board with which the connector and the wiring member were connected in the process which comprises the electronic circuit structure used with the unit of FIG. FIG. 8 is a side view illustrating a state where an electronic circuit is attached to the circuit board illustrated in FIG. It is the top view which showed the state before resin casting of 2nd Embodiment of the electronic circuit unit concerning this invention. FIG. 10 is a sectional view taken along line XX in FIG. 9. FIG. 10 is a side view showing a state in which a resin is cast into the case of the unit of FIG. It is a top view in the state before resin casting of the conventional electronic circuit unit. It is a front view of the unit. It is the XIV-XIV sectional view taken on the line of FIG. It is the side view which notched and showed the state which poured resin in the case of the unit.

Explanation of symbols

1a to 1g Electronic components 2A, 2B Circuit board 3A, 3B, 3C Board direct connector 4 Electronic circuit component 6 Case 7 Resin mold part

Claims (5)

A circuit board on which electronic components necessary for configuring an electronic circuit are mounted, and a plurality of boards directly connected to an opposite circuit when the electronic circuit is connected to an external circuit attached to an end of the circuit board. An electronic circuit component having a mounting connector, and a box-shaped case containing the electronic circuit component, wherein the electronic circuit component is configured to fix each board direct mounting connector to a side wall of the case. In the electronic circuit unit in which the required mold part of the electronic circuit component is molded by the resin mold part that is accommodated in the case in a state led out to the outside and formed by resin cast in the case,
Two or more circuit boards are provided, and electronic components necessary for configuring the electronic circuit are attached to the two or more circuit boards,
The circuits formed on the two or more circuit boards are electrically connected by a flexible wiring member,
Among the circuit boards to which the electronic components are attached, two or more circuit boards are used as connector mounting circuit boards, and at least one board-mounted connector is attached to one side of each connector mounting circuit board,
At least two side walls of the case are used as connector deriving side walls, and a board direct-attached connector attached to any connector mounting circuit board is derived from each connector deriving side wall,
The dimensions of the case are such that a gap is formed between the other side of each connector mounting circuit board and the side wall of the case before the resin is cast into the case. That it is configured,
Electronic circuit unit characterized by   2. The electronic circuit unit according to claim 1, wherein the two or more circuit boards are arranged in a state where their plate surfaces are opposed to each other in a direction perpendicular to the bottom surface of the case.   2. The electronic circuit unit according to claim 1, wherein the two or more circuit boards are arranged in a plane along a plane parallel to the bottom surface of the case. Two circuit boards are provided, and each of the two circuit boards serves as the connector mounting circuit board,
The board direct-attached connector includes a connector housing on the front side to which a mating connector is connected, a plurality of contacts accommodated in the connector housing, and a plurality of contacts connected to the plurality of contacts, respectively. A plurality of L-shaped lead terminals protruding outward from the back surface of the connector housing, the connector housing being mounted on a portion near the end of the corresponding circuit board, and the tips of the plurality of lead terminal portions being It is attached to the corresponding connector mounting circuit board in the state soldered to the corresponding connector mounting circuit board,
The two connector mounting circuit boards are arranged in a state where the surface on which the respective board direct mounting connectors are attached faces the opening side of the case,
Two side walls of the case are used as the connector lead-out side walls, and the notches for fitting a part of the connector housing of the board-mounted connector to be led out into each of the two connector lead-out side walls are described above. It is formed in an open state in the opening direction of the case,
The board direct-attached connectors respectively attached to the two connector-attaching circuit boards are configured so that a part of each connector housing is fitted in a notch provided in each of two side walls of the case. Fixed to the two side walls of the case,
The resin mold portion has a bottom wall portion of the case at a position where it can completely cover the lead terminals of the board-mounted connector attached to the circuit board for connector attachment arranged on the side close to the bottom wall portion of the case. A connector mounting circuit board formed so as to have a first mold part having a parallel resin surface and a resin surface inclined with respect to the bottom wall part of the case and disposed on the side close to the opening of the case A second mold part that covers a portion of the lead terminal of the board direct-attached connector that is attached to the part that is not covered by the first mold part,
The electronic circuit unit according to claim 2.   5. The electronic circuit unit according to claim 1, wherein the wiring member is made of a flexible printed board in which a wiring conductor is formed on a flexible substrate material.

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