JP2007329049A - Mounting structure for connector and mounting method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a connector and a mounting method therefor which enable higher connection reliability. <P>SOLUTION: The mounting structure for a connector 130 is provided in which a surface-mounting type connector 130 having a plurality of terminals 131 provided in a housing 132 is mounted on the surface of a substrate 120 with a plurality of lands 121b provided thereon. A fastening means 140 made from metal and having a portion attached to the housing 132 holds the substrate 120 only in the thickness direction of the substrate 120, whereby the housing 132 is fixed to the substrate 120. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connector mounting structure in which a surface mount type connector is mounted on a substrate, and a mounting method thereof.

  In recent years, surface-mounted connectors that are mounted on the surface of a substrate have been used in place of insertion-type connectors that insert terminals into a substrate from the viewpoints of higher density, smaller size, and more efficient mounting (patents) Reference 1).

Patent Document 1 discloses a structure and a mounting method for mounting a surface mount type connector on a substrate. Specifically, the housing is supported by the first molten solder interposed between the connector housing and the board in a floating state on the board, and the housing in this supported state is supported between the terminal and the land. Positioning is performed so that the terminal comes to the center of the land by the action of the surface tension of the second molten solder interposed. Then, in a state where the first and second molten solders are solidified by cooling, the through holes provided in the substrate are inserted into the screw holes provided in the housing, and the screws are screwed (fastened), and the housing Is mechanically fixed on the substrate.
JP 2004-206924 A

  By the way, at the time of reflow, due to the influence of the weight of the connector, a downward convex warp occurs in the connector arrangement region of the board. In particular, when the number of terminals of the connector increases, the amount of warpage increases, making it difficult to ensure the connection between all the terminals and the corresponding lands.

  In Patent Document 1, before the molten solder is cooled and solidified, the terminals are positioned on the corresponding lands in the plane direction of the substrate by the self-alignment effect by the second molten solder. Further, in the thickness direction of the substrate, that is, the height direction with respect to the substrate surface, the terminal is not positioned on the corresponding land and is in a free state. Therefore, in the state where the first and second molten solders are melted, if the board warps due to the influence of the weight of the connector, the distance between the terminal and the board surface varies.

  In addition, since the first and second molten solders are fastened in a cooled and solidified state, the life of the solder joint portion is reduced by the stress at the time of fastening. In particular, since the first molten solder is clamped between the screw head and the housing by fastening, the life is likely to be reduced.

  Moreover, the screw hole which comprises a fastening means is provided in the housing which consists of synthetic resins, and the screw is comprised from the metal. Therefore, when placed in a cold environment (for example, a vehicle mounting environment) after mounting, there is a problem that fastening is loosened due to a difference in linear expansion coefficient between members constituting the fastening means or creep deformation of the housing provided with the screw holes. Thus, in patent document 1, there exists a problem that the connection reliability between a land and a terminal falls.

  In view of the above problems, an object of the present invention is to provide a connector mounting structure and a mounting method capable of improving connection reliability.

  In order to achieve the above object, the invention according to claim 1 is a connector in which a surface mount type connector having a plurality of terminals disposed on a housing is mounted on a substrate having a plurality of lands on the surface. A mounting structure, in which one end of a plurality of terminals exposed from a housing is connected to a corresponding land and a solder, respectively, and a part of the metal is attached to the housing, so that only the substrate has a thickness. The housing is fixed in the direction, and the housing is fixed to the substrate.

  Thus, according to the present invention, since a part of the fastening means is attached to the housing, the housing can be fixed to the board by sandwiching the board by the fastening means. And since a fastening means consists of metal, the loosening of the fastening by the linear expansion coefficient difference of the member which comprises a fastening means can be reduced rather than before. Therefore, connection reliability can be improved.

  Further, only the substrate is clamped by the fastening means (in other words, only the substrate is disposed between the fastening means). Therefore, for example, the amount of creep deformation of the member sandwiched between the fastening means can be reduced by the amount of the housing as compared with the configuration in which the housing made of synthetic resin is sandwiched by the fastening means together with the substrate. Therefore, connection reliability can be improved.

  It is to be noted that the portion between the opposing portions of the fastening means disposed on the connector mounting surface and the back surface of the substrate is sandwiched.

  Preferably, the fastening means fixes the housing to the substrate in a state before melting the solder. In this case, since soldering is performed before the solder is melted and cooled and solidified (before the terminals and lands are electrically connected via the solder), it is possible to suppress a decrease in the life of the solder joint due to stress at the time of fastening. it can. Further, since the substrate is clamped by the fastening means before the solder is melted and the substrate is fixed to the rigid, the deformation of the substrate at the time of melting can be reduced. That is, connection reliability can be further improved.

  For example, as described in claim 3, the fastening means may include a bolt and a nut, and either the bolt or the nut may be attached to the housing or the substrate. The attachment to the housing or the substrate may be direct or may be through another member. In addition, rivets or the like can be employed as the fastening means.

  Specifically, as described in claim 4, the nut is attached to the housing, and the bolt is inserted into the through-hole provided in the board so that the head is locked to the back surface of the connector mounting surface of the board. The structure fastened with the nut can be employed. In this case, one end surface (seat surface) of the nut in the penetrating direction is exposed from the surface on the substrate side of the housing so as to sandwich only the substrate, and may be configured to contact the connector mounting surface of the substrate. According to a fifth aspect of the present invention, a cylindrical member is included as a fastening means, and at least one opening end portion is in contact with a connector mounting surface of the board with respect to a hole provided in the housing and opening to the board side. It is good also as a structure by which the cylindrical member is arrange | positioned by the form and the nut is arrange | positioned in contact with the other opening edge part of the cylindrical member. In this way, by using the cylindrical member (so-called metal collar), it is possible to hold only the substrate by the fastening means while the one end surface of the nut in the penetrating direction is not exposed from the surface on the substrate side of the housing. .

  According to a sixth aspect of the present invention, the fastening means includes a fixing member attached to the housing and in contact with the connector mounting surface of the board in a state where the housing is fixed to the board, and the nut is attached to the housing via the fixing member. It is good also as the structure comprised. As described above, even if the fixing member made of metal is attached to the housing and the nut is attached to the fixing member, only the substrate can be held by the fastening means. Since the fixing member is made of metal and constitutes a fastening means, only the substrate may be arranged between the bolt head and the nut in the fastening state, or the fixing member is arranged together with the substrate. May be.

  According to a seventh aspect of the present invention, the fastening means includes a fixing member that is attached to the housing and is in contact with the connector mounting surface of the substrate in a state where the housing is fixed to the substrate, and the nut is provided on the back surface of the connector mounting surface of the substrate. It is also possible to adopt a configuration in which the bolt is attached and inserted into a through hole provided in the fixing member and the substrate, and the head is locked to the fixing member. Even with such a configuration, only the substrate can be held by the fastening means.

  Further, as described in claim 8, the fastening means includes a bolt and a fixing member attached to the housing and in contact with the connector mounting surface of the board in a state where the housing is fixed to the board. A screw hole is provided corresponding to the bolt, and the bolt is inserted into a through hole provided in the board so that its head is locked to the back surface of the connector mounting surface of the board, and is fastened to the screw hole of the fixing member. It is good also as a composition. Thus, even if a screw hole is directly provided in a fixing member made of metal instead of a nut, only the substrate can be clamped by the fastening means.

  In addition, as described in claim 9, in the configuration in which the fixing member is attached to the housing by press-fitting, the press-fitting direction is preferably opposite to the fitting direction of the external connector to the connector. If comprised in this way, even if the stress of a fitting direction acts, such as a fitting with an external connector or the vibration of the harness connected to an external connector, it prevents that a fixing member remove | deviates from a housing (an attachment state is cancelled | released). be able to.

  As described in the tenth aspect, it is preferable that a plurality of portions to be held by the fastening means are plural. Thereby, a board | substrate can be fixed more rigidly and a deformation | transformation of a board | substrate can be suppressed. Also, the stress transmitted through the connector can be distributed. That is, connection reliability can be further improved.

  Specifically, as described in claim 11, the plurality of terminals are arranged along the longitudinal direction of the housing, and the plurality of sandwiching portions are provided in a staggered manner with respect to the longitudinal direction in the plane direction of the substrate. It is good also as the structure comprised. According to a twelfth aspect of the present invention, the plurality of terminals are arranged along the longitudinal direction of the housing, and in the plane direction of the substrate, the plurality of clamping portions are arranged in the longitudinal direction at the center in the short direction of the housing. It is good also as a structure provided along.

  Next, the invention according to claim 13 is a connector mounting method for mounting a surface mount type connector having a plurality of terminals arranged on a housing on a substrate having a plurality of lands on the surface, The solder is melted, cooled and solidified in a state where the housing is fixed to the board, and one end of a plurality of terminals exposed from the housing is electrically connected to the corresponding land respectively. And a reflow process.

  As described above, according to the present invention, the housing is fixed to the board before the solder is melted and cooled and solidified (before the terminals and lands are electrically connected via the solder). It is possible to suppress a decrease in the life of the joint. Further, since the housing is fixed to the substrate before the solder is melted (in other words, the substrate is fixed to the rigid), the deformation of the substrate at the time of melting can be reduced. That is, connection reliability can be further improved.

  In addition, as described in claim 14, in the fixing step, it is preferable that only the substrate is sandwiched in the thickness direction by fastening means made of metal partially attached to the housing. In this case, since the fastening means is made of metal, it is possible to reduce the looseness of fastening due to the difference in linear expansion coefficient of the members constituting the fastening means as compared with the conventional case. Therefore, connection reliability can be improved.

  Further, only the substrate is sandwiched by the fastening means (in other words, only the substrate is disposed between the fastening means). Therefore, for example, the amount of creep deformation of the member held by the fastening means can be reduced by the amount of the housing as compared with a configuration in which the housing made of synthetic resin is sandwiched by the fastening means together with the substrate. Therefore, connection reliability can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an exploded view showing a schematic configuration of an electronic apparatus that employs a connector mounting structure and a connector mounting method according to a first embodiment of the present invention. 2A and 2B are plan views of the vicinity of the connector mounting, where FIG. 2A is a view from the mounting surface side, and FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2A for explaining the connector mounting structure. 4A and 4B are diagrams showing a schematic configuration of the fixing member of the fastening means, wherein FIG. 4A is a plan view seen from above the mounting surface of the substrate, and FIG. 4B is a plan view seen from the plane direction of the substrate. . In Fig.2 (a), the press-fit part to a housing is shown with the broken line among the fixing members.

  As shown in FIG. 1, the electronic device 100 includes a housing 110, a substrate 120 accommodated in the housing 110, and a connector 130 mounted on the substrate 120. In addition, such an electronic device 100 is employ | adopted as an apparatus which comprises engine ECU (Electric Control Unit) of a vehicle, for example.

  The casing 110 is made of, for example, a metal material such as aluminum or iron, or a synthetic resin material, and has a box-shaped case 111 that is open on one side, and a shallow cover 112 having a substantially rectangular plate shape that closes the open surface of the case 111. It consists of. Then, by assembling the case 111 and the cover 112, the housing 110 having an internal space for accommodating the substrate 120 is configured. In the present embodiment, the casing 110 is configured by screwing the peripheral edge of the case 111 and the peripheral edge of the cover 112 both made of aluminum. Note that the housing 110 is not limited to one constituted by two members, the case 111 and the cover 112. It may be composed of one member or may be composed of three or more members.

  The board 120 is a circuit board in which an electronic component 122 such as a microcomputer, a resistor, and a capacitor is mounted on a printed board 121 in which a wiring pattern and a via hole for connecting the wiring patterns are formed on a base material. In addition, the material of the base material which comprises the printed circuit board 121 is not specifically limited. For example, a known material such as a thermoplastic resin, a thermosetting resin, a ceramic, a composite of glass (for example, glass cloth) and a resin, or the like can be used. In the present embodiment, the printed circuit board 121 is configured by arranging wiring patterns in multiple layers on glass epoxy resin equivalent to FR-5.

  The connector 130 is made of a conductive material (in this embodiment, brass is gold-plated). One end of the connector 130 is connected to the substrate 120 and the other end is connected to an external connector. This is a surface mount type connector (male connector in this embodiment) formed by arranging a plurality of housings 132 made of (in this embodiment, synthetic resin). Specifically, the housing 110 (in this embodiment, the case 111) is provided with a connector opening (not shown) corresponding to the housing 132 of the connector 130, and the case 111 so as to accommodate the substrate 120. In a state where the cover 112 and the cover 112 are screwed together, a part of the connector 130 (a portion used for connection with an external connector) is exposed outside the housing 110.

  Some of the plurality of terminals 131 are fixed to the housing 132 so as not to interfere with each other. The end of the terminal 131 on the side mounted on the substrate 120 extends from one side surface of the housing 132 and is bent so that the tip end portion thereof is substantially parallel to the printed circuit board 121. The part is configured as a connection part 131 a with a land provided on the printed circuit board 121. In the present embodiment, two rows of terminals 131 are arranged along the longitudinal direction of the housing 132, and an end portion on the side mounted on the printed circuit board 121 and an end portion on the side connected to the external connector are arranged. The connector 130 is used in a manner extending from the opposing side surfaces of the housing 132. However, the aspect of the connector 130 is not limited to the above example. It is at least a surface-mount type connector 130, and a plurality of terminals 131 may be arranged along the longitudinal direction of the housing 132. For example, it is also possible to employ a connector 130 including terminals 131 in a form in which an end portion on the side mounted on the printed circuit board 121 and an end portion on the side connected to the external connector are respectively extended from the same surface of the housing 132. it can.

  1 is a fitting protrusion provided on the outer peripheral surface of the housing 132, and the fitting protrusion 132a is fitted into a groove provided in the external connector, so that the connector 130 and the external connector are provided. Can be fixed. Reference numeral 132b denotes a sealing concave portion provided on the outer peripheral surface of the housing 132, and the peripheral portion of the connector opening of the housing 110 is inserted into the concave portion 132b via a known sealing member (not shown). By arranging, the space configured in the housing 110 can be a waterproof space. Although the waterproof connector 130 is shown in the present embodiment, a non-waterproof structure may be used.

  The electronic device 100 configured as described above further includes fastening means 140 made of metal. The fastening means 140 is for fixing the housing 132 of the connector 130 to the substrate 120, and a part thereof is attached to the housing 132. Further, only the substrate 120 is held by the fastening means 140 in the thickness direction of the substrate 120.

  As shown in FIGS. 1 to 4, the fastening means 140 according to the present embodiment is attached to a bolt 141, a nut 142 that is paired with the bolt 141, and a housing 132, and the housing 132 is fixed to the substrate 120. The fixing member 143 is in contact with the connector mounting surface of the substrate 120. As each constituent material, at least a metal, preferably a material having substantially the same linear expansion coefficient, more preferably the same material may be employed.

  As shown in FIG. 3, the bolt 141 includes a head 141 a that is engaged (contacted) with the back surface of the connector mounting surface of the board 120 in a state of being screwed with the nut 142, and a planar direction of the board 120 from the head 141 a. And a pillar portion 141b that is screwed into a nut 142 through a through hole 121a provided in the substrate 120 (printed circuit board 121) corresponding to the bolt 141. The column portion 141b is threaded within a predetermined range from the insertion tip, and is configured to be screwed with the nut 142.

  As shown in FIG. 3, the nut 142 includes a cylindrical fixing portion 142a that is press-fitted into a fixing through hole 143c provided in the fixing member 143 along the thickness direction of the substrate 120, a fixing portion 142a, And a positioning portion 142b that has an inner diameter that is the same as that of the fixing portion 142a, an outer diameter that is larger than that of the fixing portion 142a, and that abuts against a peripheral portion of the fixing through-hole on the back surface of the substrate contact surface of the fixing member 143. The In addition, the screw | thread screwed together with the screw provided in the pillar part 141b is cut in the internal peripheral surface of the fixing | fixed part 142a and the positioning part 142b. One end of the fixing portion 142a is exposed from the substrate contact surface of the fixing member 143, and the fixing portion 142a is in a state where the positioning portion 142b is in contact with the peripheral portion of the fixing through hole on the back surface of the substrate contacting surface of the fixing member 143. Is configured such that one end thereof contacts the board 120 on the connector mounting surface (that is, a seating surface). In the present embodiment, the seating surface of the fixing portion 142a and the board contact surface of the fixing member 143 are flush with each other, and both are configured to contact the connector mounting surface of the board 120 in the fastened state. In the present embodiment, the head portion 141a of the bolt 141 and the fixing portion 142a of the nut 142 are configured to substantially overlap in the planar direction of the substrate 120. That is, the facing portion (the sandwiched portion) between the bolt 141 and the nut 142 is determined by the head portion 141a of the bolt 141 and the fixing portion 142a of the nut 142.

  As shown in FIG. 3 and FIGS. 4A and 4B, the fixing member 143 is attached to the housing 132 and a contact portion that is connected to the attachment portion 143 a and contacts the connector mounting surface of the board 120. 143b. A fixing through-hole 143c is provided in the contact portion 143b corresponding to the bolt 141. The fixing member 143 according to the present embodiment is configured such that a metal plate is bent in an L shape, and the attachment portion 143 a is press-fitted and fixed to the housing 132. More specifically, as shown in FIGS. 2, 3, and 4 (b), the attachment portion 143 a has a fitting direction between the connector 130 and the external connector (along the connector mounting surface of the board 120, and A press-fitting direction (the arrow direction shown in FIGS. 2A and 4B) opposite to the arrow direction shown in FIG. 2A is provided in a corresponding recess (not shown) provided in the housing 132. It is configured to be press-fitted and fixed. In this way, when the press-fitting direction is opposite to the fitting direction of the connector 130 and the external connector, the fitting with the external connector or the vibration of the harness connected to the external connector, etc., while having a simple configuration called press-fitting, is performed. When the directional stress acts on the connector 130, the fixing member 143 can be prevented from being detached from the housing 132 (the attached state is released). Further, the contact portion 143b protrudes from the lower surface of the housing 132 (the surface facing the connector mounting surface of the substrate 120) toward the substrate side, and the contact portion 143b contacts the connector mounting surface of the substrate 120, so The position of the connector 130 with respect to (the position of the connecting portion 131a with respect to the land) is determined.

  As shown in FIG. 3, the fastening means 140 configured as described above has a nut 142 press-fitted and fixed in a fixing through hole 143 c of the fixing member 143 in a state where the fixing member 143 is press-fitted and fixed to the housing 132. . In this fixed state, the connector 130 is positioned on the connector mounting surface of the substrate 120. The column 141b of the bolt 141 is inserted through the through hole 121a of the board 120 and screwed with the nut 142. In this screwed state, the head 141a of the bolt 141 is locked to the back surface of the connector mounting surface of the board 120. (Contact). That is, the substrate 120 is sandwiched between the head 141a of the bolt 141 and the press-fit fixing portion 142a of the nut 142. Further, the contact portion 143 b of the fixing member 143 is sandwiched between the positioning portion 142 b of the nut 142 and the substrate 120.

  As described above, in the mounting structure of the connector 130 according to this embodiment (and the electronic device 100 to which the mounting structure is applied), a part of the fastening means 140 is attached to the housing 132, and only the substrate 120 is attached by the fastening means 140. The housing 132 can be fixed to the substrate 120. And since the fastening means 140 which clamps only the board | substrate 120 consists of metal, the loosening of the fastening by the linear expansion coefficient difference of the member which comprises the fastening means 140 can be reduced rather than before. Therefore, connection reliability can be improved.

  In addition, since only the substrate 120 is clamped by the fastening means 140 (in other words, only the substrate 120 is disposed between the fastening means 140), the housing 132 made of a material having a linear expansion coefficient different from that of the fastening means 140 is provided in the substrate 120. At the same time, the amount of creep deformation of the member sandwiched between the fastening means 140 can be reduced by the amount of the housing 132 as compared with the configuration sandwiched by the fastening means 140. Therefore, connection reliability can be further improved.

  In this embodiment, the fastening means 140 composed of one bolt 141, nut 142, and fixing member 143 is provided at both ends in the longitudinal direction of the housing 132 as shown in FIGS. 2 (a) and 2 (b). Each is provided. As described above, when a plurality of portions of the substrate 120 are clamped by the fastening means 140, the substrate 120 is more rigidly fixed, and for example, warpage of the substrate 120 that occurs during reflow can be reduced. Further, the stress transmitted through the connector 130 can be distributed by the plurality of fastening means 140. That is, connection reliability can be further improved. 2B is an area corresponding to the arrangement area of the connector 130 on the back surface of the connector mounting surface of the board 120. In FIG. In particular, in this embodiment, the contact portion 143b of the fixing member 143 contacts the connector mounting surface of the substrate 120, and is clamped by the substrate 120 facing the positioning portion 142b of the nut 142 in the fastened state. That is, the substrate 120 is rigidly fixed over a wider range by the fixing member 143. Therefore, for example, warpage of the substrate 120 that occurs during reflow can be further reduced.

  Next, a mounting method for realizing the mounting structure of the connector 130 described above will be described with reference to FIG. FIGS. 5A and 5B are plan views showing the connector mounting method as seen from the back side of the fitting side with the external connector. FIG. 5A shows a state after fastening and FIG. 5B shows a state after the reflow process.

  First, the nut 142 is press-fitted and fixed to the fixing member 143, and the fixing member 143 is press-fitted and fixed to the housing 132. Any of these press-fitting and fixing may be performed first. And as shown to Fig.5 (a), the bolt 141 and the nut 142 are fastened in the aspect which pinched | interposed the board | substrate 120 in between. By this fastening, the substrate 120 is clamped, and the housing 132 is fixed to the substrate 120 via the fixing member 143. This step corresponds to the fixing step shown in the claims. Note that lands 121b are provided on the connector mounting surface of the substrate 120 in correspondence with the terminals 131, and in the above-described fastening state, the connection portions 131a of the terminals 131 are pasty provided on the corresponding lands 121b. In contact with the solder 123.

  Next, the reflow process is performed in the fastened state. Thereby, the solder 123 on the land 121b is melted. Then, after cooling and solidification, the terminal 131 and the land 121b are electrically connected via the solder 123a. With the above mounting method, the mounting structure of the connector 130 described above can be realized.

  As described above, when the housing 132 is fixed on the substrate 120 before the solder 123 is melted and cooled and solidified (before the terminal 131 and the land 121b are electrically connected via the solder 123a), the stress at the time of fixing is determined. It is possible to suppress a decrease in the life of the solder joint due to. Further, since the housing 132 is fixed to the substrate 120 before the solder 123 is melted (in other words, the substrate 120 is fixed to the rigid), the warpage of the substrate 120 during reflow can be reduced. That is, connection reliability can be further improved. In the present embodiment, the contact portion 143b of the fixing member 143 contacts the connector mounting surface of the substrate 120, and is clamped by the substrate 120 facing the positioning portion 142b of the nut 142 in the fastened state. 120 can be more rigidly fixed.

  Further, when the bolt 141 and the nut 142 are fastened, the fixing member 143 and the nut 142 are integrated. Therefore, positioning is easy even though the fastening means 140 includes three or more members.

  In the present embodiment, the nut 142 is press-fitted and fixed to the fixing member 143, and the head 141a of the bolt 141 is in contact with the back surface of the connector mounting surface of the board 120. However, as shown in FIG. 6, the nut 142 is fixed to the back surface of the connector mounting surface of the substrate 120, and the bolt 141 penetrates the fixing through hole 143 c of the fixing member 143 and the substrate 120 from the connector mounting surface side of the substrate 120. It is good also as a structure which penetrates the hole 121a and is screwed together with the nut 142. In this case, the substrate 120 and the fixing member 143 can be sandwiched between the head 141a of the bolt 141 and the nut 142. In other words, the substrate 120 can be clamped by the contact portion 143b of the fixing member 143 and the nut 142 sandwiched by the bolt 141 and the nut 142. 6 is a schematic cross-sectional view showing a modified example of the mounting structure of the connector 130, and corresponds to FIG. In FIG. 6, in the planar direction of the substrate 120, a fixing portion 142 a that is fixed to the substrate 120 via a connecting member 150 (for example, solder) is provided in a region that does not face the head 141 a of the bolt 141. A positioning portion 142b is provided in a region facing the head 141a. That is, the substrate 120 and the fixing member 143 are sandwiched between the head 141a of the bolt 141 and the positioning portion 142b of the nut 142. Therefore, since the connecting member for fixing the nut 142 to the substrate 120 is not sandwiched between the bolt 141 and the nut 142, the drop of the nut 142 due to creep deformation of the connecting member 150 can be reduced.

  Further, in the present embodiment, as shown in FIG. 3, an example is shown in which only the substrate 120 is disposed (sandwiched) between the bolt 141 and the nut 142 in the fastening state. However, the fixing member 143 (contact portion 143b) may be disposed between the bolt 141 and the nut 142, and the fixing member 143 may be sandwiched together with the substrate 120. For example, in the configuration shown in FIG. 3, the fixing member 143 may be sandwiched between the head 141 a of the bolt 141 and the positioning portion 142 b of the nut 142 by expanding the diameter of the head 141 a of the bolt 141. Further, in the configuration in which the fixing member 143 is clamped by the bolt 141 and the nut 142, the nut 142 may be disposed behind the side surface of the substrate of the fixing member 143, although the nut 142 is exposed from the fixing member 143. . In this case, the substrate 120 can be sandwiched between the head 141a of the bolt 141 and the contact portion 143b of the fixing member 143 facing the head 141a.

  In the present embodiment, an example in which the seating surface of the fixing portion 142a and the substrate contact surface of the fixing member 143 are flush with each other is shown. However, as shown in the present embodiment, in the configuration in which the fixing member 143 and the nut 142 are fixed before being fastened, the fixing member 143 may not be sandwiched and fixed by the bolt 141 and the nut 142. Therefore, the seating surface of the nut 142 (fixing portion 142a) protrudes more toward the board than the board contact surface of the fixing member 143, and the position of the connector 130 in the thickness direction of the board 120 is defined by the seating surface of the nut 142. Also good.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIG. FIG. 7 is a schematic cross-sectional view showing the mounting structure of the connector 130 which is a characteristic part in the electronic device 100 according to the second embodiment. FIG. 7 corresponds to FIG. 3 shown in the first embodiment.

  In the present embodiment, as shown in FIG. 7, the fastening means 140 includes a bolt 141, a fixing member 143 that is attached to the housing 132 and contacts the connector mounting surface of the substrate 120 in a state where the housing 132 is fixed to the substrate 120. (That is, the nut 142 is not provided).

  The bolt 141 has substantially the same configuration as the bolt 141 shown in the first embodiment, and is different in that it is screwed into a screw hole 143d provided in the fixing member 143 in place of the nut 142. . Specifically, a head 141 a that contacts the back surface of the connector mounting surface of the board 120 in a state of being screwed into a screw hole 143 d provided in the fixing member 143, and the planar direction of the board 120 from the head 141 a The column portion 141b extends vertically and is inserted into the through hole 121a and the screw hole 143d provided in the substrate 120 (printed circuit board 121). The column 141b is threaded within a predetermined range from the insertion tip, and is configured to be screwed into the screw hole 143d.

  The fixing member 143 has substantially the same configuration as the fixing member 143 shown in the first embodiment, and the difference is that the contact portion 143b is replaced with the fixing through-hole 143c along the thickness direction of the substrate 120. The screw hole 143d penetrating the contact portion 143b is provided. Specifically, it includes an attachment portion 143a attached to the housing 132 and a contact portion 143b that is bent substantially perpendicular to the attachment portion 143a and contacts the connector mounting surface of the board 120. And the screw hole 143d mentioned above is provided in the contact part 143b.

  Then, as shown in FIG. 7, with the head 141a of the bolt 141 locked (contacted) with the back surface of the connector mounting surface of the substrate 120, the column portion 141b is inserted through the through hole 121a of the substrate 120, and the fixing member 143 is screwed (fastened) with a screw hole 143d provided in the contact portion 143b. The contact portion 143b of the fixing member 143 contacts the connector mounting surface of the substrate 120, and the substrate 120 is sandwiched between the head portion 141a of the bolt 141 and the contact portion 143b facing the head portion 141a.

  Thus, even if the screw hole 143d is provided in the fixing member 143 made of metal instead of the nut 142, the same effect as in the first embodiment can be expected.

  Further, according to the configuration shown in the present embodiment, the nut 142 is unnecessary, so the number of parts can be reduced, and the configuration can be simplified as compared with the configuration shown in the first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a plan view of the electronic device 100 according to the third embodiment as viewed from the mounting surface side near the connector mounting. FIG. 9 is a cross-sectional view taken along the line BB in FIG.

  In this embodiment, as shown in FIGS. 8 and 9, the fastening means 140 includes a pair of bolts 141 and nuts 142, and the nut 142 is directly fixed to the housing 132 (that is, the fixing member). (It does not have 143).

  As shown in FIG. 8, the housing 132 is provided so as to extend to the clamping portions respectively provided at both ends in the longitudinal direction of the housing 132. Then, as shown in FIG. 9, a fixing hole 132 c into which the nut 142 is press-fitted and fixed is provided in the extended portion. The fixing hole 132c has a stepped portion so that the position where the fixing portion 142a is press-fitted and the positioning portion 142b come into contact with each other to determine the position of the substrate 120 in the thickness direction.

  The bolt 141 has the same configuration as the bolt 141 shown in the first embodiment. Specifically, a head 141 a that is locked (contacted) with the back surface of the connector mounting surface of the board 120 while being screwed with the nut 142, and extends perpendicularly to the planar direction of the board 120 from the head 141 a. And a column part 141b that is inserted through a through-hole 121a provided in the substrate 120 (printed circuit board 121) and screwed into the nut 142. The column portion 141b is threaded within a predetermined range from the insertion tip, and is configured to be screwed with the nut 142.

  The nut 142 has substantially the same configuration as the nut 142 shown in the first embodiment. A different point is that it is fixed to the housing 132 instead of the fixing member 143. Specifically, a cylindrical fixing portion 142a that is press-fitted and fixed in a fixing hole portion 132c provided in the housing 132, is connected to the fixing portion 142a, has an inner diameter that is the same as that of the fixing portion 142a, and an outer diameter. The positioning portion 142b is larger than the fixing portion 142a and contacts the step portion of the fixing hole 132c. In addition, the screw | thread screwed together with the screw provided in the pillar part 141b is cut in the internal peripheral surface of the fixing | fixed part 142a and the positioning part 142b. The nut 142 is press-fitted and fixed to the housing 132 such that one end surface (seat surface) protrudes more toward the substrate side than the surface of the housing 132 on the substrate side. Also in the present embodiment, the head portion 141a of the bolt 141 and the fixing portion 142a of the nut 142 are configured to substantially overlap in the planar direction of the substrate 120. That is, the facing portion (the sandwiched portion) between the bolt 141 and the nut 142 is determined by the head portion 141a of the bolt 141 and the fixing portion 142a of the nut 142.

  9, with the head 141a of the bolt 141 in contact with the back surface of the connector mounting surface of the substrate 120, the column portion 141b is inserted through the through hole 121a of the substrate 120 and is press-fitted and fixed to the housing 132. The nut 142 is screwed (fastened). Further, the fixing portion 142a of the nut 142 is in contact with the connector mounting surface of the substrate 120, and only the substrate 120 is sandwiched between the head portion 141a of the bolt 141 and the fixing portion 142a facing the head portion 141a.

  As described above, instead of the metal fixing member 143, the nut 142 is fixed to the housing 132, but the housing 132 is not clamped and only the substrate 120 is clamped. The same effect can be expected.

  Further, since the fixing member 143 is unnecessary, the number of parts can be reduced, and the configuration can be simplified as compared with the configuration shown in the first embodiment.

  In the present embodiment, the facing portion (the sandwiched portion) between the bolt 141 and the nut 142 is determined by the head portion 141a of the bolt 141 and the fixing portion 142a of the nut 142. Therefore, the seating surface of the nut 142 may be configured to be flush with the surface of the housing 132 on the substrate side. Also in this case, only the substrate 120 can be held.

  Moreover, in this embodiment, the example which clamps the board | substrate 120 with the nut 142 and the volt | bolt 141 which were arrange | positioned at the housing 132 was shown. However, for example, as shown in FIG. 10, the fastening means 140 includes a cylindrical member 144 made of metal, and is provided in a hole 132 d (through hole in FIG. 10) provided in the housing 132 and opening at least on the substrate side. The cylindrical member 144 may be arranged such that one opening end is in contact with the connector mounting surface of the substrate 120, and the nut 142 is arranged in contact with the other opening end of the cylindrical member 144. In this way, by using the cylindrical member 144 (so-called metal collar), the cylindrical member facing the head 141a of the bolt 141 without exposing the seating surface of the nut 142 from the substrate-side surface of the housing 132. It is possible to sandwich only the substrate 120 with the terminal 144. FIG. 10 is a schematic cross-sectional view showing a modification. In FIG. 10, the nut 142 is press-fitted and fixed to the cylindrical member 144. However, the fixing method is not particularly limited.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In this embodiment, the example which applies the mounting structure and mounting method of the connector 130 which concern on this invention to the electronic device 100 which comprises engine ECU (Electric Control Unit) of a vehicle was shown. However, the application range is not limited to the above example. The present invention can be applied to a configuration in which the surface mount type connector 130 is mounted on the printed circuit board 121 (board 120).

  In this embodiment, the example containing the volt | bolt 141 as the fastening means 140 was shown. However, a configuration that does not include the bolt 141 may be employed. For example, a rivet that is a static coupling element as well as a screw may be employed. When the rivet 145 made of metal is employed, for example, as shown in FIG. 11A, the through-hole 121a of the substrate 120 and the fixing through-hole 143c of the fixing member 143 are inserted, and the both ends 145a and 145b of the rivet 145 are inserted. The substrate 120 and the fixing member 143 may be sandwiched. Further, the function of the rivet 145 may be given to the fixing member 143. For example, as shown in FIG. 11B, as a part of the fixing member 143, a protrusion 143 e that protrudes toward the substrate 120 and protrudes toward the back surface of the substrate 120 in a state where the connector 130 is disposed on the substrate 120. Provided, crushing the tip of the protrusion 143e to form a locking portion 143f that locks to the back surface of the substrate 120, and the locking portion 143f and the contact portion 143b of the fixing member 143 facing the locking portion 143f, The substrate 120 may be sandwiched. In either case, the same effect as in the first embodiment can be expected. In addition, the number of parts can be reduced. 11B shows an example in which the protrusion 143e that functions as the rivet 145 is provided. However, the rivet 145 may be fixed (for example, press-fitted) to the fixing member 143 to be integrated. . FIGS. 11A and 11B are schematic cross-sectional views showing a modified example of the mounting structure of the connector 130 in both FIGS.

  In the present embodiment, as shown in FIGS. 2A and 2B, an example is shown in which clamping portions are provided at both ends of the housing 132 in the longitudinal direction. However, the clamping part is not limited to a plurality. Moreover, when providing with two or more, it is not limited to both ends. For example, as shown to Fig.12 (a), it is good also as a structure by which several clamping site | parts were provided along the longitudinal direction in the center position (one-dot chain line in a figure) of the transversal direction of a housing. In this case, for example, warpage of the substrate 120 in the longitudinal direction that occurs during reflow can be further reduced. Moreover, as shown in FIG.12 (b), it is good also as a structure by which the several clamping part was provided in zigzag form with respect to the longitudinal direction. In this case, the clamping position becomes planar, and the stress is dispersed with respect to the stress from various directions as compared with the configuration shown in FIG. 12A, so that the connection reliability can be improved. FIGS. 12A and 12B are plan views showing a modification of the mounting structure of the connector 130 in both FIGS. In addition to the configuration shown in FIGS. 12A and 12B, for example, a configuration may be provided in which the housing is linearly provided along the longitudinal direction at a position shifted from the center position in the short direction of the housing. Alternatively, a staggered configuration (for example, a configuration in which the center clamping position is shifted from the center in the lateral direction in FIG. 12A) may be provided near the center of the housing in the lateral direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view showing a schematic configuration of an electronic device adopting a connector mounting structure and a connector mounting method according to a first embodiment, before assembly; It is a top view of the mounting vicinity of a connector, (a) is the figure seen from the mounting surface side, (b) is the back surface side of the mounting surface. It is sectional drawing which follows the AA line of Fig.2 (a) for demonstrating the mounting structure of a connector. It is a figure which shows schematic structure of a fixing member among fastening means, (a) is the top view seen from the mounting surface of a board | substrate, (b) is the top view seen from the plane direction of the board | substrate. It is the top view seen from the back side of the fitting side with the external connector which shows the mounting method of a connector, (a) is at the time of fastening, (b) has shown the after reflow process. It is sectional drawing which shows the modification of the mounting structure of a connector. In the electronic device which concerns on 2nd Embodiment, it is a schematic sectional drawing which shows the mounting structure of the connector which is a characteristic part. In the electronic device which concerns on 3rd Embodiment, it is the top view seen from the mounting surface side of mounting vicinity of a connector. It is sectional drawing which follows the BB line of FIG. 8 for demonstrating the mounting structure of a connector. It is a schematic sectional drawing which shows a modification. (A), (b) is a schematic sectional drawing which shows the modification of the mounting structure of a connector. (A), (b) is a top view which shows the modification of the mounting structure of a connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Electronic device 110 ... Case 120 ... Board | substrate 130 ... Connector 131 ... Terminal 132 ... Housing 140 ... Fastening means 141 ... Bolt 142 ... Nut 143- ..Fixing members

Claims (14)

A connector mounting structure in which a surface mount type connector having a plurality of terminals disposed on a housing is mounted on a substrate having a plurality of lands on the surface,
One end of the plurality of terminals exposed from the housing is connected to the corresponding land and solder, respectively.
A connector mounting structure, wherein only the board is sandwiched in the thickness direction by fastening means made of metal partially attached to the housing, and the housing is fixed to the board.   The connector mounting structure according to claim 1, wherein the fastening means fixes the housing to the substrate in a state before the solder is melted. The fastening means includes a bolt and a nut,
The connector mounting structure according to claim 1, wherein any one of the bolt and the nut is attached to the housing or the substrate. The nut is attached to the housing;
4. The bolt according to claim 3, wherein the bolt is inserted into a through hole provided in the board so that a head thereof is engaged with a back surface of a connector mounting surface of the board, and is fastened to the nut. The connector mounting structure described. As the fastening means, including a cylindrical member,
The cylindrical member is disposed in such a manner that one opening end is in contact with the connector mounting surface of the substrate with respect to at least a hole provided in the housing and opening toward the substrate, and the other opening end of the cylindrical member is arranged. The connector mounting structure according to claim 4, wherein the nut is disposed in contact with a portion. The fastening means includes a fixing member attached to the housing and in contact with a connector mounting surface of the board in a state where the housing is fixed to the board,
The connector mounting structure according to claim 4, wherein the nut is attached to the housing via the fixing member. The fastening means includes a fixing member attached to the housing and in contact with a connector mounting surface of the board in a state where the housing is fixed to the board,
The nut is attached to the back surface of the connector mounting surface of the board,
The bolt is inserted into a through-hole provided in the fixing member and the substrate in a form in which a head thereof is locked to the fixing member, and fastened to the nut. The connector mounting structure described. The fastening means includes a bolt, and a fixing member attached to the housing and in contact with the connector mounting surface of the board in a state where the housing is fixed to the board,
The fixing member is provided with a screw hole corresponding to the bolt,
The bolt is inserted into a through hole provided in the board so that a head of the bolt is engaged with a back surface of a connector mounting surface of the board, and is fastened to a screw hole of the fixing member. The connector mounting structure according to claim 1 or 2.   The said fixing member is attached to the said housing by press-fit, The press-fit direction is reverse to the fitting direction of the said external connector to the said connector, The any one of Claims 6-8 characterized by the above-mentioned. The connector mounting structure described in 1.   The connector mounting structure according to claim 1, wherein there are a plurality of holding portions of the substrate by the fastening means. The plurality of terminals are arranged along the longitudinal direction of the housing,
The connector mounting structure according to claim 10, wherein a plurality of the sandwiching portions are provided in a staggered manner with respect to the longitudinal direction in the planar direction of the substrate. The plurality of terminals are arranged along the longitudinal direction of the housing,
11. The connector mounting structure according to claim 10, wherein a plurality of the clamping portions are provided along the longitudinal direction at the center in the short direction of the housing in the planar direction of the substrate. A connector mounting method for mounting a surface mount type connector having a plurality of terminals disposed on a housing on a substrate having a plurality of lands on the surface,
A fixing step of fixing the housing to the substrate;
A reflow step of electrically connecting one end of the plurality of terminals exposed from the housing to the corresponding land respectively by melting the solder in the fixed state, and cooling and solidifying. How to mount the connector.   14. The connector mounting method according to claim 13, wherein, in the fixing step, only the substrate is clamped in the thickness direction by fastening means made of metal partially attached to the housing.

Images