JP5569096B2 - Electronic circuit unit with external connection - Google Patents

Description

  The present invention relates to an electronic circuit unit which is mounted on a vehicle such as an automobile and can be connected to an external circuit via a plurality of electric wires.

  2. Description of the Related Art Conventionally, an electronic circuit unit mounted on a vehicle includes a circuit board in which an electronic circuit is incorporated, and a board connector for connecting an external connection wire to a connection conductor on the circuit board. Many are known. Furthermore, as the board connector, a so-called card edge type connector that is mounted on the edge of the circuit board is known.

  For example, in the following Patent Document 1, as shown in FIG. 13, a terminal 92 provided at each end of a plurality of electric wires, a terminal side housing 94 that holds these terminals 92, and an edge of a circuit board 96 are fixed. A connector having a board-side housing 98 is disclosed.

  Each of the terminals 92 has an elastic contact piece 93 that can be elastically displaced in the thickness direction of the circuit board 96. When the elastic contact piece 93 comes into contact with the surface of the circuit board 96, the elastic contact piece 93 is elastically displaced by receiving a reaction force from the surface, and is brought into pressure contact with the connection conductor on the surface by the elastic return force.

  The terminal-side housing 94 is arranged so that the elastic contact pieces 93 of the terminals 92 sandwich the circuit board 96 from both the front and back sides, and a plurality of terminals 92 are arranged along the width direction of the circuit board 96. These terminals 92 are held. The board-side housing 98 has a shape capable of receiving the terminal-side housing 94, and the terminal-side housing 94 is placed at a position where the elastic contact piece 93 of each terminal 92 contacts the connecting conductor of the circuit board 96. Lock.

JP 2008-112682 A

  In the electronic circuit unit using the connector 90, it is difficult to reduce the overall size and the structure. Specifically, the connector 90 requires a terminal side housing 94 for holding a plurality of terminals 92 and a board side housing 98 for locking the terminal side housing 94 to the circuit board 96 side. Further, the circuit board is accommodated in a predetermined case. This case must accommodate the connector 90 attached to the circuit board 96 in addition to the circuit board 96, and the case is enlarged accordingly. .

  An object of the present invention is to provide an electronic circuit unit including a circuit board, a case for housing the circuit board, and a plurality of terminals for external connection, in order to solve the above-described problems. To provide what is possible.

The present invention provides an electronic circuit unit capable of solving the above problems. The electronic circuit unit includes a circuit board having an edge and a plurality of connection conductors provided on the surface thereof, a case for housing the circuit board, and a plurality of connection conductors to be connected to the connection conductors of the circuit board. A plurality of terminals each having a board contact portion that can be brought into contact with a corresponding connecting conductor, and the case holds the circuit board at a specific board holding position. A board holding part for accommodating the terminal, and a terminal holding part for holding the terminals; and the terminal holding part includes a plurality of terminal accommodating chambers into which the terminals can be inserted from the outside to the inside of the case; the terminal inserted into each terminal receiving chamber to have a plurality of terminal locking portions for the substrate contact portion of the terminals are respectively locking the position where it is in contact with the corresponding connection conductors of the connecting conductor. The board holding part of the case is opened to the side opposite to the terminal holding part, and the circuit board is in a direction perpendicular to the plate thickness direction of the circuit board from the opening with the edge as the head. A main body having a shape that allows insertion in the substrate insertion direction, which is a direction toward the holding portion, and a lid that is detachably attached to the main body so as to close the opening of the main body. The main body includes a top wall and a bottom wall that respectively cover the front and back surfaces of the circuit board, and is connected to the top wall and the bottom wall so as to be integrated with the top wall and the bottom wall, and the circuit board is connected to the board. A pair of side walls for holding the circuit board from both sides in the plate thickness direction while guiding the board in the insertion direction, and these side walls respectively guide the board from the opening of the main body part in the board insertion direction. And a guide groove for reaching the substrate holding position. Terminal holding portion of the case will have a substrate restraining portion for holding the circuit board in the board holding position by sandwiching the circuit board from both sides of the board insertion direction between said lid portion.

  In this electronic circuit unit, it is not necessary to use a terminal-side housing and a board-side housing together as in the prior art, and the contact between the board contact portion of each terminal and the connection conductor of the circuit board has a simple structure using a case. Guaranteed. Specifically, a terminal is inserted and locked in each terminal accommodating chamber in the terminal holding portion of the case, and the circuit board is held in the substrate holding position in the substrate holding portion of the same case. Contact between each connection conductor of the circuit board and the board contact portion of each terminal is achieved and held. Therefore, it is not necessary to provide a dedicated housing for holding the terminals as in the prior art.

Furthermore, it is easy to set the circuit board in the board holding section. Specifically, with the lid part removed from the opening, the circuit board is inserted from the opening in the board insertion direction with the edge thereof at the top, and is guided by guide grooves provided on both side walls. after reaching to the substrate restraining portion of the terminal holding portion while being, the lid need be attached to the main body portion so as to close the opening. Thereby, the circuit board is stably held at the board holding position between the lid part and the board restraining part.

  Here, it is more preferable that the connection conductor is provided on both front and back surfaces of the edge of the circuit board. In this case, the terminal holding portion is interposed between a group of terminals that respectively contact the connection conductor on one surface of the circuit board and a group of terminals that contact the connection conductor on the other surface. And a front end portion of the intermediate wall is located at a position retracted from the board contact portion of each terminal so as to restrain the edge portion of the circuit board interposed between the two terminal groups. Moreover, what constitutes the substrate restraining portion is suitable.

  In this electronic circuit unit, it is preferable that the circuit board is prevented from being inserted into the board holding portion in the reverse direction. This prevention is provided, for example, in a reverse insertion prevention member fixed on the surface so as to protrude from one surface of the circuit board, and in the case, and the circuit board holding portion in the reverse direction. This is achieved with a simple structure by a combination with an insertion preventing portion that prevents complete insertion of the circuit board by contacting the reverse insertion preventing member only when it is inserted into the circuit board.

  As described above, the present invention provides an electronic circuit unit that can be miniaturized and simplified in structure by using a case that accommodates and holds a circuit board and holding each terminal in the case.

It is a cross-sectional perspective view showing a circuit board, a state where the case and the terminals are assembled electronic circuit unit according to the implementation of the embodiment of the present invention. It is a cross-sectional perspective view which shows the state before inserting each terminal in each terminal accommodating chamber of the terminal holding part of the case in the said electronic circuit unit. It is a cross-sectional perspective view which shows the stage which the retainer for terminal double latching exists in a temporary latching position in the said terminal holding part. It is a cross-sectional perspective view which shows the process of inserting the said circuit board in the board | substrate holding part of the said case. It is a cross-sectional perspective view which shows the process of attaching a cover part to the main-body part of the said board | substrate holding part in which the said circuit board was inserted. It is a cross-sectional perspective view which shows the detail of the said board | substrate holding part. The implementation of the embodiment of the present invention is a cross-sectional perspective view showing a state before coalesces both case members to each other in an electronic circuit unit according to another first embodiment. It is a cross-sectional perspective view which shows the state which united the said case members. It is a perspective view which shows the internal structure of one case member of the said both case members. It is a perspective view showing a state where the half body is inserted in the circuit board to the second case member according to another second embodiment is the implementation of the embodiment of the present invention. It is a cross-sectional perspective view which shows the state of FIG. It is an enlarged view of the XII part of FIG. It is sectional drawing which shows the example of the conventional card edge type connector.

The implementation of the embodiment of the present invention will be described with reference to FIGS.

  The electronic circuit unit according to this embodiment includes a circuit board 10, a case CS that accommodates the circuit board 10, and a plurality of terminals 30 for connecting a plurality of electric wires W to the circuit board 10.

  The circuit board 10 is made of, for example, a printed circuit board, and a conductor pattern for circuit configuration is disposed on both the front and back surfaces of the circuit board 10 and electronic components constituting the circuit are mounted. The circuit board 10 according to this embodiment has a rectangular shape. A plurality of thin plate-like connecting conductors 14 are provided on the front side surface and the back side surface of one edge portion (left side edge portion in FIGS. 1 and 4) 12. These connecting conductors 14 are arranged along the edge 12.

  The case CS is formed of an insulating material such as plastic and has a substrate holding part 20 and a terminal holding part 40.

  The substrate holding part 20 has a main body part 28 having an opening 21 that is a substantially rectangular parallelepiped and opened in a specific direction (left direction in FIGS. 1 and 4), and a lid part 26 that is detachably attached to the main body part. The circuit board 10 has a shape that allows the circuit board 10 to be inserted in the board insertion direction (the left direction in FIGS. 1 and 4 in this embodiment) perpendicular to the thickness direction.

Specifically, the main body 28 has a top wall 22, a bottom wall 23, and a pair of left and right side walls 24. The top wall 22 and the bottom wall 23 are arranged vertically in a posture parallel to each other. Both side walls 24 are disposed between the top wall 22 and the bottom wall 23, and form a rectangular cylinder together with the top wall 22 and the bottom wall 23. And the said cover part 26 is detachably mounted | worn with the peripheral part of the said opening 21 so that the said opening 21 which is the opening of the one side of the said square cylinder body may be blocked.

  A guide groove 25 is formed on the inner side surface of each side wall 24. Each guide groove 25 extends in the board insertion direction and has a width that allows the left and right edges of the circuit board 10 to be inserted into the guide groove 25. By inserting the circuit board 10 into the board holding part 20 with this insertion, the right and left edge parts of the circuit board 10 are held from both front and back sides (upper and lower sides in this embodiment) by the side walls 24, that is, the circuit A state in which the substrate 10 is sandwiched from both sides in the thickness direction is formed.

  Each terminal 30 is attached to the terminal of the corresponding electric wire W. Each electric wire W consists of a conductor (not shown) and an insulating coating covering the conductor. At the end of the electric wire W, the insulating coating is partially removed to expose the conductor.

  Each terminal 30 is formed of a metal plate that is a conductor, and is attached to the end of the corresponding electric wire W. Specifically, each terminal 30 has a substrate contact portion 31 and a wire connection portion 32 at the front and rear. The electric wire connection part 32 has the left and right conductor barrels 33 and the left and right insulation barrels 34 at the front and rear. Both conductor barrels 33 are crimped to the conductors so as to embrace the exposed conductors of the ends of the electric wires W, thereby conducting to the conductors. Both insulation barrels 34 are crimped to the electric wire W so as to embrace a portion of the insulating coating located behind the exposed portion of the conductor.

  As shown in FIG. 6, the substrate contact portion 31 includes a box-shaped main body portion 35 extending in the terminal axis direction, and an elastic contact piece 36 having a shape bulging from the main body portion 35 in a direction perpendicular to the terminal axis direction. Have The main body portion 35 is formed integrally with the electric wire connection portion 32, and a part of the metal plate constituting the electric wire connection portion 32 is formed in a rectangular tube shape. A window 35 a penetrating through one of the four walls constituting the main body 35 is formed. The elastic contact piece 36 bulges out from the inside of the main body 35 to the outside of the main body 35 through the window 35a. However, when the elastic contact piece 36 comes into contact with the connection conductor 14 of the edge 12 of the circuit board 10, the elastic contact piece 36 is immersed in the window 35a due to the reaction force from the edge 12. In this way, it bends and displaces and presses against the connecting conductor 14 with its elastic force.

  The terminal holding part 40 is located on the side opposite to the opening 21 with respect to the board holding part 20 and is formed integrally with the main body part 28 of the board holding part 20. The terminals 30 are held together in such an arrangement that the elastic contact pieces 36 of the terminals 30 are in contact with the connection conductors 14 on both sides of the edge 12 of the circuit board 10 at the same time.

  Specifically, the terminal holding portion 40 includes a pair of upper and lower top walls 41 and a bottom wall 42 extending in parallel to each other, an intermediate wall 44 positioned between the top wall 41 and the bottom wall 42, and a pair of left and right side walls 46. (Only one side wall 46 is shown in FIG. 6), and a plurality of lines arranged in the left-right direction between the top wall 41 and the intermediate wall 44 and between the bottom wall 42 and the intermediate wall 44, respectively. Terminal housing chamber 45 is formed. Each terminal accommodating chamber 45 has a shape that allows the corresponding terminal 30 to be inserted from the outside to the inside of the case CS so that the elastic contact piece 36 faces the substrate holding part 20.

The intermediate wall 44 is at the same height as the guide groove 25. The front end (right end in FIG. 1) 44a of the intermediate wall 44 is positioned behind the front ends of the top wall 41 and the bottom wall 42, and the edge of the circuit board 10 is positioned in front of the front end 44a of the intermediate wall 44. A board insertion space into which the portion 12 can be inserted is secured. Each terminal 30 is held by the terminal holding part 40 so that the elastic contact piece 36 of each terminal 30 faces the board insertion space.

  That is, the terminals 30 (the upper row of terminals 30) accommodated in the terminal accommodating chamber between the top wall 41 and the intermediate wall 44 are held by the terminal holding portion 40 so that the elastic contact pieces 36 face downward. The terminal 30 (the terminal 30 in the lower row) accommodated in the terminal accommodating chamber between the bottom wall 42 and the intermediate wall 44 is connected to the terminal holding portion 40 so that the elastic contact piece 36 faces upward. Retained. The intermediate wall 44 is interposed between the group of upper terminals 30 and the group of lower terminals 30.

  The terminal holding position of each terminal 30 in the terminal holding portion 40 is such that the edge 12 of the circuit board 10 is completely inserted into the board insertion space, and the end surface of the edge 12 abuts against the front end 44 a of the intermediate wall 44. The elastic contact pieces 36 of the respective terminals 30 are set so as to simultaneously contact the respective connection conductors 14 of the circuit board 10 at the positions. That is, the front end 44 a of the intermediate wall 44 constitutes a “board restraint portion” that restrains the circuit board 10 along the board insertion direction, and the circuit board between the front end 44 a and the lid portion 26 attached to the main body portion 28. 10 is sandwiched from both sides in the substrate insertion direction. This sandwiched position corresponds to a regular “substrate holding position”. In other words, the dimension of the circuit board 10 along the board insertion direction is substantially equal to the distance between the front end 44a of the intermediate wall 44 and the inner surface of the lid part 26 attached to the main body part 28. Is set.

  The terminal holding part 40 has a plurality of lances (terminal locking parts) 43 for holding the terminals 30. Each lance 43 is deflected and displaced in a direction to retract from the terminal 30 when the terminal 30 is inserted into the terminal accommodating chamber 45 from the outside of the case CS (from the left side in FIGS. 1 to 4). When the insertion of 30 is completed, the terminal 30 is locked in place by elastic recovery. In this embodiment, a locking projection 43 a as shown in FIG. 6 is formed at the end of the lance 43, while the main body portion 35 of the board contact portion 31 of the terminal 30 is opposite to the elastic contact piece 36. A wall 35b to be locked is formed in the wall, and the locking protrusion 43a is fitted into the hole 35b to be locked.

  In this embodiment, a pair of upper and lower retainers 50 </ b> A and 50 </ b> B are added to the terminal holding portion 40. These retainers 50A, 50B are for performing double locking (locking in addition to locking by the lance 43) of the terminals 30 arranged on the upper side and the lower side of the intermediate wall 44, respectively. Each is attached to the top wall 41 and the bottom wall 42 of the terminal holding part 40. As shown in FIG. 3, each of the retainers 50 </ b> A and 50 </ b> B has an outer wall 52 extending in a direction parallel to the arrangement direction of the terminals 30 (connector width direction), and a plurality projecting from the outer wall 52 into each terminal accommodating chamber. , And a pair of left and right side walls 56.

  On the other hand, the top wall 41 and the bottom wall 42 are respectively formed with retainer mounting holes 41a and 42a that pass through them in the thickness direction and cross in the width direction. And, in a state where each terminal 30 is inserted into each terminal accommodating chamber 45, the outer walls 52 of the retainers 50A, 50B are respectively fitted from the outside into the retainer mounting holes 41a, 42a. The locking wall 54 is positioned behind the substrate contact portion 31 and prevents its removal.

  These retainers 50A and 50B are not essential in the present invention. Further, the connecting conductors 14 do not necessarily have to be disposed on both the front and back surfaces of the circuit board 10 and may be disposed only on one surface thereof. In that case, the terminals 30 need only be arranged in a row in the terminal holding part 40.

  Next, the assembly procedure of this electronic circuit unit will be described.

1) Inserting the terminal 30 into the terminal holding part 40 (FIGS. 2 and 6)
The retainers 50A and 50B are fitted in the retainer mounting holes 41a and 42a of the top wall 41 and the bottom wall 42 of the terminal holding part 40, and are in the temporary locking positions, and each terminal accommodating chamber 45 of the terminal holding part 40 is provided. Each terminal 30 is inserted into the case CS from the outside to the inside. A lance 43 in the terminal holding portion 40 is engaged with the inserted terminal 30 to lock the terminal 30 (primary locking). Thereby, each terminal 30 is arranged in the upper and lower two stages, and each terminal 30 is held in the common terminal holding part 40 in a posture in which the elastic contact piece 36 of each terminal 30 faces inward.

2) Double locking by retainers 50A and 50B (Fig. 3)
The retainers 50 </ b> A and 50 </ b> B are pushed from the temporary locking position into the main locking position inside the terminal holding portion 40. As a result, the retainers 50A and 50B double-lock each terminal 30.

3) Inserting the circuit board 10 into the board holding part 20 (FIG. 4)
In parallel with or before and after 1) and 2), the circuit board 10 is inserted through the opening 21 into the main body 28 of the board holding part 20 in the case CS. This insertion is performed with the lid portion 26 removed from the main body portion 28. The circuit board 10 is accurately inserted along the board insertion direction while being guided by the guide groove 25 of the side wall 24, and the edge 12 on the front side of the insertion contacts the front end 44a of the intermediate wall 44 on the terminal holding part 40 side. That is, it reaches the substrate holding position. As a result, a state is formed in which the connection conductors 14 provided on both surfaces of the edge 12 are simultaneously in contact with the elastic contact pieces 36 of the terminals 30.

4) Mounting the lid 26 (FIG. 5)
A lid portion 26 is attached to the main body portion 28 so as to close the opening 21. At the time of mounting, the lid portion 26 abuts on or very close to the edge portion 16 of the circuit board 10 opposite to the edge portion 12. As a result, the position of the circuit board 10 is determined as the board holding position. That is, the circuit board 10 is sandwiched between the lid part 26 and the front end 44a of the intermediate wall 44 of the terminal holding part 40 in the board insertion direction, and is held by the left and right side walls 24 in the plate thickness direction. As a result, the position of the circuit board 10 is fixed at the board holding position. Therefore, the contact between each connection conductor 14 of the circuit board 10 in the board holding position and the elastic contact piece 36 of each terminal 30 held by the terminal holding part 40 is ensured.

  Thus, in this electronic circuit unit, the terminal holding portion 40 is formed in the case CS, that is, by using the case CS as a connector housing for holding the terminal 30, the terminal side housing and High connection reliability can be ensured while achieving a reduction in size and simplification of the structure as compared with a unit in which a substrate side housing must be used together.

  In this embodiment, since the circuit board 10 is sandwiched between the lid portion 26 and the intermediate wall 44 and is fixed to the board holding position, the case CS has a mechanism for locking the circuit board 10 in particular. I don't need it. However, in the present invention, the case CS may have a mechanism for positively locking the position of the circuit board 10. In that case, the terminal holding part 40 does not necessarily have a board restraining part that abuts against the edge part 12, and each terminal 30 and the circuit board 10 are located at a position where the terminal holding part 40 is locked to the case CS. It is only necessary to ensure contact with each connection conductor 14.

  Further, in the assembly procedure described above, the terminals 30 may be inserted into the terminal accommodating chambers 45 in a state where the circuit board 10 is previously held in the board holding unit 20.

Next, a first embodiment different from the embodiment of the present invention will be described with reference mainly to FIGS.

Electronic circuit unit according to the shape condition of this includes a circuit board 10, and a case CS to accommodate this, the first terminal 30A and the second terminal 30B for connecting a plurality of electric wires W to the circuit board 10.

The circuit board 10 is made of, for example, a printed circuit board, and a conductor pattern for circuit configuration is disposed on both the front and back surfaces of the circuit board 10 and electronic components constituting the circuit are mounted. Circuit board 10 according to the shape condition of this is a rectangular shape. A plurality of thin plate-like first connection conductors on the front side and the back side of the first edge 12A and the second edge 12B on both sides in the specific direction (the left and right edges in FIGS. 11 to 13). 14A and a second connection conductor 14B are provided. These connection conductors 14A and 14B are arranged along the edge portions 12A and 12B.

The case CS has been molded by an insulating material such as plastic, in the form status of this, the first case member CS1 for containing said first edge portion 12A side of the circuit board 10, the first It is divided into a second case member CS2 for accommodating the two edge portions 12B side. The first case member CS1 has a first substrate holding part 20A and a first terminal holding part 40A, and the second case member CS2 has a second substrate holding part 20B and a second terminal holding part 40B.

  Each of the substrate holding portions 20A and 20B has a shape that opens toward the other substrate holding portion, and the corresponding half of the circuit board 10 is inserted in the substrate insertion direction perpendicular to the plate thickness direction. It has a shape that allows it to be done. Specifically, in the example shown in FIG. 7, the first substrate holding unit 20A accepts insertion of the left half of the circuit board 10 (half on the first edge 12A side), and the second substrate holding unit 20B is the circuit board. 10 insertion of the right half (half on the second edge 12B side) is accepted.

  The first substrate holding unit 20A has a top wall 22A, a bottom wall 23A, and a pair of left and right side walls 24A. Similarly, the second substrate holding unit 20B has a top wall 22B, a bottom wall 23B, and a pair of left and right side walls 24B. Have The top walls 22A and 22B and the bottom walls 23A and 23B are arranged vertically in parallel postures. Both side walls 24A are disposed between the top wall 22A and the bottom wall 23A to form a rectangular cylinder together with the top wall 22A and the bottom wall 23A. Similarly, the side walls 24B are formed between the top wall 22B and the bottom wall 23B. A square cylinder is formed together with the top wall 22B and the bottom wall 23B.

  As shown in FIG. 9, the upper and lower edge portions on the opening side of the respective substrate holding portions 20 </ b> A and 20 </ b> B are provided with an engagement protrusion 26 protruding outward from the edge portion, and an engagement hole 27 penetrating the edge portion Are arranged side by side. Each of the engagement protrusions 26 has a shape that can be engaged with and engaged with the engagement hole 27 of the other substrate holding portion. Then, the engagement protrusions 26 and the engagement holes 27 on the first substrate holding part 20A side and the engagement holes 27 and the engagement protrusions 26 on the second substrate holding part 20B side are engaged with each other, whereby both cases The combined state (FIG. 8) of the members CS1 and CS2 is maintained.

Guide grooves 25A and 25B are formed on the inner side surfaces of the side walls 24A and 24B at the same height. Each guide groove 25A, 25B extends in the board insertion direction, and has a width that allows the right and left edges of the circuit board 10 to be inserted into the guide grooves 25A, 25B. Substrate holding portion 20A with the plug, the insertion of the circuit board 10 into the 20B, the state the right and left edges of the circuit board 10 is held by (upper and lower sides in this form status) front and back sides by the side walls 24, That is, a state in which the circuit board 10 is sandwiched from both sides in the thickness direction is formed.

The first terminals 30A and the second terminals 30B are attached to the terminals of the corresponding electric wires W, respectively. Since the shape and structure of these terminals 30A and 30B are the same as the shape and structure of the terminal 30 according to the above- described embodiment of the present invention , description thereof will be omitted.

  The first terminal holding part 40A is located on the side opposite to the opening with respect to the first substrate holding part 20A, and is formed integrally with the first substrate holding part 20A. The first terminals 30A are collectively arranged in such an arrangement that the elastic contact pieces 36 of the first terminals 30A are in contact with the first connection conductors 14A on both surfaces of the first edge 12A of the circuit board 10 respectively. Hold. Similarly, the second terminal holding part 40B is located on the side opposite to the opening with respect to the second substrate holding part 20B, and is formed integrally with the second substrate holding part 20B. The second terminals 30B are collectively arranged in such an arrangement that the elastic contact pieces 36 of the second terminals 30B are in contact with the second connection conductors 14B on both surfaces of the second edge 12B of the circuit board 10 respectively. Hold.

  Specifically, each of the terminal holding portions 40A and 40B includes a pair of upper and lower top walls 41 and a bottom wall 42 extending in parallel with each other, an intermediate wall 44 positioned between the top wall 41 and the bottom wall 42, and a pair of left and right sides. And a plurality of terminal accommodating chambers 45 arranged in the left-right direction between the top wall 41 and the intermediate wall 44 and between the bottom wall 42 and the intermediate wall 44, respectively. It is formed. Each terminal accommodating chamber 45 has a shape that allows the corresponding terminal 30 to be inserted from the outside to the inside of the case CS so that the elastic contact piece 36 faces the substrate holding part 20.

  The intermediate walls 44 are at the same height as the guide grooves 25A and 25B. A front end (a left end in the first terminal holding portion 40A and a right end in the second terminal holding portion 40B in FIG. 7) 44a of the intermediate wall 44 is located behind the front ends of the top wall 41 and the bottom wall 42. A board insertion space into which each edge 12A, 12B of the circuit board 10 can be inserted is secured on the front side of the front end 44a of the intermediate wall 44. The terminals 30A and 30B are held by the terminal holding portions 40A and 40B so that the elastic contact pieces 36 of the terminals 30A and 30B face the board insertion space.

  That is, the terminals 30 (the upper row of terminals 30) accommodated in the terminal accommodating chamber between the top wall 41 and the intermediate wall 44 are held by the terminal holding portion 40 so that the elastic contact pieces 36 face downward. The terminals 30A and 30B (the lower row terminals 30A and 30B) accommodated in the terminal accommodating chamber between the bottom wall 42 and the intermediate wall 44 are arranged such that the elastic contact piece 36 faces upward. It hold | maintains at holding | maintenance part 40A, 40B. Therefore, the intermediate wall 44 is interposed between the group of the upper terminals 30A and 30B and the group of the lower terminals 30A and 30B.

  When the case members CS1 and CS2 are combined, the edge portions 12A and 12B of the circuit board 10 are completely inserted into the respective board insertion spaces, and the end surfaces of the edge portions 12A and 12B are the intermediate walls 44. The dimensions of the case members CS1 and CS2 are set so as to abut against the front end 44a of the circuit board. At this time, the elastic contact pieces 36 of the terminals 30A and 30B contact the connection conductors 14A and 14B of the circuit board 10, respectively. The holding positions of the terminals 30A and 30B in the terminal holding portions 40A and 40B are set so as to be in contact with each other at the same time.

  That is, the front end 44a of the intermediate wall 44 of the both terminal holding portions 40A and 40B sandwiches the circuit board 10 from both sides in the board insertion direction between the front ends 44a, and this sandwiched position is a normal “substrate holding position”. Is equivalent to. In other words, the dimension of the circuit board 10 along the board insertion direction is set to be approximately equal to the distance between the front ends 44a of the intermediate walls 44 when the case members CS1 and CS2 are combined. Accordingly, the front end 44a of the intermediate wall 44 in each of the terminal holding portions 40A and 40B constitutes a “first substrate restraining portion” and a “second substrate restraining portion”, respectively.

Each of the terminal holding portions 40A and 40B has a plurality of lances (terminal locking portions) 43 for holding the terminals 30A and 30B, respectively, and further double-locks the terminals 30A and 30B. Retainers 50A and 50B are added to each. Since the structures of the lance 43 and the retainers 50A and 50B are the same as those of the above-described embodiment of the present invention , the description thereof is omitted.

For even form state of this, the retainer 50A, 50B is not essential. Further, the connecting conductors 14A and 14B are not necessarily arranged on both the front and back surfaces of the circuit board 10, and may be arranged only on one surface thereof.

In the form status of this, for cost reduction, and the shape and structure of the first case member CS1, the shape and structure of the second case member CS2 is set equal to one another. However, they may be different from each other.

  Next, the assembly procedure of this electronic circuit unit will be described.

1) The terminals 30A and 30B are inserted into the terminal holding portions 40A and 40B, and the terminals 30A and 30B are double-locked by the retainers 50A and 50B. Since these are equivalent to the insertion of the terminal 30 into the terminal holding portion 40 and the double locking of the terminal 30 by the retainers 50A and 50B in the embodiment of the present invention , description thereof is omitted.

2) Insertion of the circuit board 10 into the first substrate holding part 20A (FIG. 7)
In parallel with or before and after 1) and 2), the circuit board 10 is inserted into the first substrate holding portion 20A of the first case member CS1 from the opening thereof with the first edge portion 12A at the top. Specifically, the circuit board 10 is accurately inserted along the board insertion direction while receiving the guidance of the guide groove 25A of the side wall 24A on the first board holding part 20A side, and the first edge 12A at the head is the first edge 12A. It reaches a position where it abuts against the front end 44a of the intermediate wall 44 on the one-terminal holding portion 40A side. As a result, a state is formed in which the first connection conductors 14A provided on both surfaces of the first edge portion 12A simultaneously contact the elastic contact pieces 36 of the first terminals 30A.

3) Combining of case members CS1 and CS2 with insertion of the circuit board 10 into the second board holding part 20B (FIG. 8)
In the same manner as described above, the circuit board 10 is inserted into the second substrate holding portion 20B of the second case member CS2 from the opening with the second edge portion 12B at the top. While accompanying this insertion, the case members CS1 and CS2 are combined. This united state is maintained by the engagement of the engagement protrusion 26 and the engagement hole 27 on the first case member CS1 side, and the engagement hole 27 and the engagement protrusion 26 on the case member CS2 side in cross section. By this combination, the circuit board 10 is sandwiched between the front ends 44a of the intermediate walls 44 in the both terminal holding portions 40A and 40B in the board insertion direction, and the position, that is, the board holding position is determined. As a result, contact between the connecting conductors 14A and 14B at the respective edge portions 12A and 12B and the elastic contact pieces 36 of the terminals 30A and 30B held by the terminal holding portions 40A and 40B is simultaneously ensured.

In the form status of this, both edge portions 12A of the circuit board 10, the connection conductor 14A to 12B, 14B is provided, since the first terminal 30A and the second terminal 30B is in contact respectively thereto, to the circuit board 10 The number of electric wires W that can be connected is doubled as compared with the embodiment of the present invention . Moreover, since the board holding position of the circuit board 10 can be determined without requiring the “lid portion 26” according to this embodiment, the number of wires that can be connected with a reasonable structure can be increased.

Also in the shape condition of this, the case member CS1, CS2 coalesce together with those of the substrate holding portion 20A, in a state in which prestores circuit board 10 in 20B, the terminal housing of the terminal holding portion 40A, 40B later Insertion of the terminals 30 </ b> A and 30 </ b> B into the chamber 45 may be performed.

In the present invention, it is prevented that the circuit board 10 is housed in the substrate holding part 20 (in the second embodiment, the first board holding part 20A and the second board holding part 20B) in the reverse direction. preferable. This prevention may be achieved by, for example, a reverse insertion preventing member fixed on the surface so as to protrude from one surface of the circuit board 10 and a case CS (in the second embodiment, the first case member CS1 and the The circuit board 10 is provided on the second case member CS2 (the case member on the side accommodating the reverse insertion prevention member) and comes into contact with the reverse insertion prevention member only when the circuit board 10 is in the reverse direction. This is achieved with a simple structure by the combination with the insertion preventing portion that prevents the complete insertion of the two (in the second embodiment, prevents the combination of the two case members CS1 and CS2).

This combination will be described as a second embodiment different from the embodiment of the present invention with reference to FIGS. 10 to 12 by taking the electronic circuit unit of the same type as the first embodiment as an example.

  In the circuit board 10 shown in the figure, the reverse insertion preventing piece 19 is fixed on the surface facing upward when the circuit board 10 is in a normal posture, for example, by means of soldering. The fixed position is a position close to the second edge 12B and is set on either the left or right edge.

  On the other hand, of the side wall 24B of the second case member CS2, the insertion allowing recess 29A and the insertion blocking wall 29B are arranged side by side on the side wall 24B on the reverse insertion preventing piece 18 side. The insertion allowing recess 29A is located immediately above the guide groove 25B on the side wall 24B, and when the circuit board 10 is inserted into the guide groove 25A in a normal posture, the reverse insertion preventing piece 19 on the circuit board 10 is inserted. Is received (allowing the insertion of the reverse insertion preventing piece 18 into the insertion allowing recess 29A), the complete insertion of the circuit board 10 into the second case member CS2 side and the combination of both case members CS1 and CS2 are performed. Allow. On the other hand, the insertion prevention wall 29B is positioned directly below the guide groove 25B, and when the circuit board 10 is inserted into the guide groove 25B in an upside down (reversed front and back) posture, the reverse of the circuit board 10 side is reversed. By abutting against the insertion preventing piece 19, the complete insertion of the circuit board 10 to the second case member CS2 side and the combination of both case members CS1 and CS2 are prevented.

This reverse insertion prevention structure can be similarly applied to the above- described embodiment of the present invention . For example, the reverse insertion preventing piece 19 protrudes at a position near the edge 12 of the circuit board 10 shown in FIG. 4, and an insertion preventing part is provided in the board holding part 20 of FIG. However, when the circuit board 10 is inserted face down, the insertion blocking portion may be set to a position where it abuts against the reverse insertion preventing piece 19 before the edge portion 12 is completely inserted. .

CS case CS1 first case member CS2 second case member W electric wire 10 circuit board 12 edge portion 12A first edge portion 12B second edge portion 14 connecting conductor 14A first connecting conductor 14B second connecting conductor 19 reverse insertion prevention Piece 20 Substrate holding portion 20A First substrate holding portion 20B Second substrate holding portion 21 Opening 24, 24A, 24B Side wall 25, 25A, 25B Guide groove 26 Lid portion 28 Body portion 29A Insertion-allowing recess 29B Insertion prevention wall 30 Terminal 30A First 1 terminal 30B 2nd terminal 31 board contact part 32 electric wire connection part 36 elastic contact piece 40 terminal holding part 40A 1st terminal holding part 40B 2nd terminal holding part 43 lance (terminal locking part)
44 Intermediate wall 44a Front end of the intermediate wall (substrate restraint part)
45 Terminal compartment

Claims (3)

An electronic circuit unit,
A circuit board having an edge and a plurality of connecting conductors provided on the surface;
A case for housing the circuit board;
A plurality of terminals respectively provided on the ends of a plurality of electric wires to be connected to each connection conductor of the circuit board and having a substrate contact portion that can contact the corresponding connection conductor;
The case has a substrate holding part that holds the circuit board while holding the circuit board at a specific board holding position, and a terminal holding part that holds the terminals. The terminal holding part includes a case where each terminal is a case. A plurality of terminal accommodating chambers that can be inserted from the outside to the inside, and terminals inserted into the terminal accommodating chambers at positions where the board contact portions of the terminals contact the corresponding connecting conductors among the connecting conductors. have a plurality of terminal locking portions for respectively locking,
The board holding part of the case is opened to the side opposite to the terminal holding part, and the circuit board is in a direction perpendicular to the plate thickness direction of the circuit board from the opening with the edge as the head. A main body having a shape that allows insertion in the substrate insertion direction, which is a direction toward the holding portion, and a lid that is detachably attached to the main body so as to close the opening of the main body,
The main body includes a top wall and a bottom wall that respectively cover the front and back surfaces of the circuit board, and is connected to the top wall and the bottom wall so as to be integrated with the top wall and the bottom wall, and the circuit board is connected to the board. A pair of side walls for holding the circuit board from both sides in the plate thickness direction while guiding the board in the insertion direction, and these side walls respectively guide the board from the opening of the main body part in the board insertion direction. And having a guide groove to reach the substrate holding position,
To have a substrate restraining portion for holding the circuit board by sandwiching the circuit board from both sides of the board insertion direction between the terminal holding portion of the case and the lid to the substrate holding position, the electronic circuit unit. The electronic circuit unit according to claim 1 ,
The connection conductor is provided on both front and back sides of the edge of the circuit board, and the terminal holding portion is a group of terminals that contact a connection conductor on one side of the circuit board and a connection on the other side, respectively. An intermediate wall interposed between a group of terminals in contact with the conductor for conductor, and the front end of the intermediate wall is in a position retracted from the board contact portion of each terminal, An electronic circuit unit that constitutes the board restraining portion so as to restrain the edge portion of the circuit board interposed therebetween. 3. The electronic circuit unit according to claim 1, further comprising a reverse insertion preventing member fixed on the surface so as to protrude from one surface of the circuit board, and the circuit board provided in the case. An electronic circuit unit comprising: an insertion preventing portion that prevents complete insertion of the circuit board by contacting the reverse insertion preventing member only when inserted into the substrate holding portion in a reverse direction.