JP2009129576A - Electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate stress added to a soldered part of a substrate side terminal. <P>SOLUTION: Electronic equipment includes a case 12 housing a circuit board 13 with a semiconductor element 27 mounted thereon, a substrate side terminal 30 having a through-hole 31 for a screw Sc to be inserted into and soldered to the circuit board 13, a connector part terminal 17a for electrically connecting the circuit board 13 housed in the case 12 and the outside, and a case side terminal 18 integrally formed with the connector part terminal 17a and fixed in insert molding so as to be arranged inside the case 12. The substrate side terminal 30 and the case side terminal 18a are fixed by screwing the screw Sc inserted into the through-hole 31 into a screw hole 19 formed at the case side terminal 18a. Then, the case side terminal 18a, separated from an inner face of the case 12, includes a narrow-width part and a bent part for alleviating stress between the screw hole 19 and a fixed part 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device that connects and fixes a case-side terminal that is insert-molded in a case of an electronic device that houses a circuit board and a board-side terminal that is fixed to the circuit board with solder.

  An electronic device mounted in an automobile or the like accommodates a circuit board on which an electronic component is mounted in a sealed state in a case of the electronic device in order to ensure waterproofness. In this type of electronic device, a connector part terminal for external connection is usually provided in the case in order to electrically connect the circuit board accommodated in the case to the outside. Further, in order to electrically connect the case side terminal electrically connected to the connector part terminal and the circuit board accommodated in the case, a connection structure using bonding wires or terminals has been proposed (for example, Patent Documents 1 and 2).

  By the way, in a connection structure using terminals, there is an electronic apparatus having the following configuration in which a board-side terminal and a case-side terminal are fixed with screws. As shown in FIG. 5, the conventional electronic device 70 includes a circuit board 71 and a resin case 72 that accommodates the circuit board 71. A board-side terminal 74 formed by bending a rectangular metal plate is soldered to the circuit board 71 on which the electronic component 73 is mounted. An insertion hole 74a through which the screw S is inserted is formed on the free end side of the board-side terminal 74, and a narrow portion (not shown) is formed as a stress relaxation structure between the insertion hole 74a and the fixed end. ) Or a bent portion 74b. A case side terminal 76 is fixed to the case 72 by insert molding. The case-side terminal 76 is formed integrally with a connector portion terminal 75 for electrically connecting the circuit board 71 and the outside. The case-side terminal 76 is formed with an insertion hole 76a through which the screw S is inserted, and a nut 77 is insert-molded so that the female screw faces the insertion hole 76a to form an internal thread portion 78. The board-side terminal 74 and the case-side terminal 76 are electrically connected and fixed by inserting a screw S through the insertion hole 74a and the insertion hole 76a and screwing into the female screw part 78.

  As described above, in the case of the electronic device 70 in which the board-side terminal 74 and the case-side terminal 76 are fixed with the screw S, a crack may occur in the soldered portion of the board-side terminal 74 due to stress generated due to various factors. There is. As a situation where the stress is generated, when fixing with the screw S, stress (rotational torque) in the rotation direction of the screw S is applied to the board-side terminal 74 via the seat surface of the screw S, or the board-side terminal 74 is It is conceivable that the screw S is fixed while being elastically deformed in the rotational direction of the screw S due to stress (rotational torque). In addition, when the board-side terminal 74 is soldered to the circuit board 71, it is not fixed at a predetermined position, and the position of the insertion hole 74 a and the female screw part 78 may not match in a state where the circuit board 71 is accommodated in the case 72. . In such a state, by fixing the board-side terminal 74 and the case-side terminal 76 with the screws S, the board-side terminal 74 may be deformed and fixed to generate stress.

In the electronic device 70, these stresses are alleviated by a stress relaxation structure provided in the board-side terminal 74, and cracks are suppressed from occurring in the soldered portion of the board-side terminal 74. Also, Patent Document 2 discloses a configuration in which a stress relaxation structure is provided on a substrate connecting member (substrate side terminal) to relieve stress.
JP 2000-133769 A JP 2001-319701 A

  However, there are cases where the stress cannot be sufficiently eliminated only by the stress relaxation structure provided on the substrate-side terminal. Further, in the above-described conventional electronic device 70, the female screw portion 78 is formed by insert-molding a nut 77 into the case 72, and its position varies depending on the thermal expansion of the case 72. For this reason, due to the difference in thermal expansion coefficient between the case 72 and the circuit board 71, the relative positions of the insertion hole 74a and the female screw portion 78 may fluctuate and stress may be generated.

  The present invention has been made paying attention to such problems existing in the prior art, and it is an object of the present invention to provide an electronic apparatus that can relieve stress applied to a soldered portion of a board-side terminal.

  In order to solve the above problems, the invention according to claim 1 is a resin case for housing a circuit board on which an electronic component is mounted, a board-side terminal fixed to the circuit board with solder, and the case A connector part terminal for electrically connecting the circuit board housed in the case and the outside, and the connector part terminal, and formed integrally with the connector part terminal, and disposed inside the case. In an electronic device comprising a plate-like case-side terminal fixed by insert molding so that the board-side terminal and the case-side terminal are connected by screws, the case-side terminal is attached to the case The connecting portion is provided so as to extend away from the inner surface of the case from a fixed portion that is insert-molded and fixed, and includes a connecting portion that is fixed to the board-side terminal with the screw in the extended portion. And summarized in that the stress relaxation structure is provided between the fixing portion and.

  According to this, since the case-side terminal extends away from the inner surface of the case, the case-side terminal can freely swing without being restricted by being in contact with the inner surface of the case. That is, it can be said that the connection part of the case side terminal is in a state of being held hollow in the case. Furthermore, since the case side terminal is provided with a stress relaxation structure between the fixing part and the part fixed to the board side terminal with the screw (connecting part), the board side terminal and the case side terminal are connected with the screw. The case-side terminal can relieve stress generated when fixing and stress generated when the electronic device is thermally expanded. Therefore, the stress applied to the soldered portion of the board side terminal can be further relaxed.

  According to a second aspect of the present invention, in the electronic device according to the first aspect, the stress relaxation structure includes a narrow portion formed by cutting out a margin in a width direction of the case side terminal, and the case side terminal. The gist is provided with a bent portion formed by bending.

  According to this, the case-side terminal is easily deformed in the width direction by the narrow portion, and is easily deformed in the direction orthogonal to the width direction by the bent portion. Therefore, stress can be effectively relieved.

  According to a third aspect of the present invention, in the electronic device according to the first or second aspect, the board side terminal has an insertion hole for the screw, while the connection portion of the case side terminal The female screw part into which the screw is screwed is formed integrally with the case side terminal, and the screw inserted through the insertion hole through the board side terminal and the case side terminal is used as the female screw part. The gist is to screw and fix.

According to this, the board-side terminal and the case-side terminal can be securely fixed by screwing the screw inserted through the insertion hole of the board-side terminal into the female screw portion.
According to a fourth aspect of the present invention, in the electronic device according to any one of the first to third aspects, the case is formed in a bottomed box shape having a side wall, and the case side terminal is The gist is that the side wall is insert-molded and fixed.

According to this, since the case side terminal is fixed to the side wall, it becomes easy to fix the case side terminal and the board side terminal at a position close to the side wall.
According to a fifth aspect of the present invention, in the electronic device according to any one of the first to third aspects, the case is formed in a bottomed box shape having a bottom wall, and the case side terminal Is fixed to the bottom wall by insert molding.

According to this, since the case side terminal is fixed to the bottom wall of the case, the case side terminal can be provided at a position away from the side wall while reducing the portion exposed to the inside of the case.
According to a sixth aspect of the present invention, in the electronic device according to any one of the first to fifth aspects, the stress relaxation structure is orthogonal to the extending direction of the case-side terminal and the case side. A plurality of bent portions formed by bending the case side terminal so as to protrude in a direction along the thickness direction of the terminal, and at least one of the bent portions is another bent portion around the case side terminal; The gist is that the protrusion protrudes in the opposite direction to the protrusion direction.

  According to this, since the plurality of bent portions projecting in the thickness direction of the case side terminal are provided in both directions around the case side terminal, the case side terminal is more easily deformed and more effectively. Stress can be relaxed.

  According to the present invention, the stress applied to the soldered portion of the board-side terminal can be relaxed.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, an electronic device 10 mounted in an automobile or the like is configured by housing a circuit board 13 between a metal bracket 11 and a resin case 12.

  First, the case 12 will be described in detail with reference to FIGS. 1 and 2. On the outer side of the short side surface of the case 12 formed in the shape of a bottomed square box with the side walls 16 standing from the edge of the rectangular plate-like bottom wall 15, the circuit board 13 accommodated in the case 12 and the outside are connected to the outside. A connector portion 17 for electrical connection is formed to protrude.

  As shown in FIG. 2, a case terminal member 14 made of a substantially rectangular plate-like metal is insert-molded on the side wall 16 provided with the connector portion 17 so that both ends thereof protrude outside and inside the case 12, respectively. Has been. A portion of the case terminal member 14 that protrudes to the outside of the case 12 is disposed inside the connector portion 17 that is formed in a rectangular tube shape to form a connector portion terminal 17a. On the other hand, a portion of the case terminal member 14 that protrudes to the inside of the case 12 forms a case-side terminal 18 a that is electrically connected to the circuit board 13 accommodated in the case 12. Further, an intermediate portion of the case terminal member 14 is embedded in the side wall 16, and the embedded portion forms a fixing portion 25 for the connector portion terminal 17a and the case side terminal 18a. That is, the connector portion terminal 17a and the case side terminal 18a are integrally formed to ensure conductivity, and are fixed to the side wall 16 by the fixing portion 25 so as to protrude outward and inward of the case 12, respectively.

  Similarly, the case terminal member 14 is insert-molded along the bottom wall 15 and the side wall 16 of the case 12, and one end of the case terminal member 14 protrudes inside the connector portion 17 to form a connector portion terminal 17 b. Further, the case terminal member 14 is branched into two at a portion embedded in the bottom wall 15, and protrudes to the inside of the case 12 from the side wall 16 facing the side wall 16 provided with the case side terminal 18 a. Thus, two case side terminals 18b are formed. That is, the two case-side terminals 18b are both formed integrally with the connector portion terminal 17b to ensure conductivity, and are insert-molded and fixed to the case 12.

In the following description, since the case side terminal 18a and the case side terminal 18b have the same configuration, only the case side terminal 18a will be described.
As shown in FIGS. 1 and 2, the case-side terminal 18 a formed by bending a metal plate is formed so as to extend in parallel with the bottom wall 15 while being separated from the inner surface of the case 12 from the fixing portion 25. Has been. Here, “parallel to the bottom wall 15” means not only a state where the case side terminal 18 a is parallel to the bottom wall 15, but also a state where the case side terminal 18 a is slightly inclined from the fixed portion 25 toward the bottom wall 15. On the contrary, the case-side terminal 18a includes a state where the case-side terminal 18a is slightly inclined from the fixed portion 25 in the direction opposite to the bottom wall 15. A screw hole (connecting portion, female screw portion) 19 into which the screw Sc is screwed is formed on the free end side of each case side terminal 18a. The screw hole 19 is formed by screwing a female screw into a hole provided by burring on the free end side of the case side terminal 18a.

  Further, between the screw hole 19 of the case side terminal 18a and the fixing portion 25, a bent portion 20 is provided by bending the case side terminal 18a into an inverted U shape when viewed from the side. The bent portion 20 includes an upright portion 20b formed by bending a case side terminal 18a extending parallel to the bottom wall 15 in a direction perpendicular to the bottom wall 15 (the opening side direction of the case 12), and a bottom again. The second upright portion 20b is formed by being folded back toward the wall 15, and a folded-back portion 20a that connects both the upright portions 20b. The bent portion 20 is disposed so as to protrude from the case side terminal 18a at a right angle in the direction opposite to the bottom wall 15 (the opening side direction of the case 12). Further, the bent portion 20 is provided apart from the inner surface of the case 12.

Further, the case side terminal 18a is formed so that the space between the fixed portion 25 and the bent portion 20 and the space between the bent portion 20 and the free end are located on substantially the same plane.
Between the fixed portion 25 and the bent portion 20 of the case-side terminal 18a, a plurality of (two in this embodiment) cut-out portions cut into a rectangle with a predetermined width from both ends in the width direction of the case-side terminal 18a. 21a is provided, and a narrow portion 21 having a narrow width is formed by each notch portion 21a. Both notches 21a are arranged so as not to be located on the same straight line. The narrow portion 21 is formed narrower than the width of other portions of the case side terminal 18a, and the cross sectional area of the case side terminal 18a is reduced in the narrow portion 21. In the present embodiment, a stress relaxation structure is formed from the bent portion 20 and the narrow portion 21.

  As described above, the screw hole 19, the bent portion 20, and the narrow portion 21 formed in the case side terminal 18 a are in a state of being separated from the inner surface of the case 12. That is, the screw hole 19, the bent portion 20, and the narrow portion 21 of the case side terminal 18 a are configured not to come into contact with other structures constituting the case 12 such as the bottom wall 15 and the side wall 16.

  As shown in FIG. 1, a plurality of (three in this embodiment) collars 22 formed in a bottomed cylindrical shape are insert-molded on the bottom wall 15 so as to open inside the case 12. Yes. A female screw into which the screw Sf is screwed is formed on the inner surface of each metal collar 22. Further, on the inner side of the side wall 16 in the longitudinal direction of the case 12, positioning portions 23 having a semicircular shape in plan view for positioning the circuit board 13 are erected along the height direction of the side wall 16. In addition, a substantially cylindrical positioning protrusion 24 for positioning the bracket 11 is provided at a corner located on the diagonal line of the case 12, one by one.

  Next, the circuit board 13 will be described with reference to FIGS. A plurality of (six in the present embodiment) semiconductor elements (electronic devices) 27 are soldered (mounted) on a wiring pattern (not shown) formed on the metal substrate 26 on a substantially rectangular plate-shaped metal substrate 26 made of aluminum. )

  As shown in FIG. 1, the two edges along the longitudinal direction of the metal substrate 26 are positioned so as to engage with the positioning portion 23 at a position facing the positioning portion 23 when the circuit board 13 is accommodated in the case 12. The recesses 28 are cut out. The metal board 26 is formed with an insertion hole 29 through which the screw Sc is inserted at a position corresponding to the collar 22 when the circuit board 13 is accommodated in the case 12.

  As shown in FIGS. 1 and 3, a plurality of (three in this embodiment) board-side terminals 30 in which rectangular metal pieces are bent in a substantially crank shape when viewed from the side are provided on the metal board 26 with solder H. It is fixed (soldered) via. An insertion hole 31 through which the screw Sc is inserted is formed on the free end side of each board-side terminal 30. Each insertion hole 31 is formed at a position corresponding to each screw hole 19 formed in the case side terminals 18a and 18b in a plan view in a state where the circuit board 13 is accommodated in the case 12.

  Next, the bracket 11 will be described with reference to FIG. The bracket 11 made of a thin metal plate includes a rectangular plate-shaped lid plate 33 and leg portions 34 that are bent so as to be coupled to two sides of the lid plate 33 that are in contact with each other. A fixing hole 35 into which a bolt is inserted when the electronic device 10 is attached to a vehicle-side frame (not shown) is formed at the approximate center of each leg 34. Thereby, the electronic device 10 is fastened and fixed to the vehicle-side frame by the bolt inserted into the fixing hole 35 of the bracket 11 and attached. In addition, a plurality of (two in this embodiment) guide holes 36 for positioning the bracket 11 to the case 12 correspond to the positioning protrusions 24 of the case 12 when the bracket 11 is stacked on the case 12. Formed in position. In addition, a plurality of (three in this embodiment) insertion holes 37 through which the screws Sf are inserted are formed in the lid plate 33 when the bracket 11 is positioned in the case 12 and the circuit board 13 accommodated in the case 12. It is formed at a position corresponding to the insertion hole 29.

Next, the operation of the electronic device 10 of this embodiment will be described. Note that the operation of the electronic device 10 described below will focus on the manner in which the case 12 and the circuit board 13 are assembled.
First, as shown in FIGS. 1 and 3, the circuit board 13 is inserted into the case 12 so that the surface on which the semiconductor element 27 is mounted is disposed inside the case 12. At this time, the positioning portions 23 of the case 12 and the positioning recesses 28 of the circuit board 13 are engaged with each other. In this state, the screw holes 19 of the case-side terminals 18a and 18b and the insertion holes 31 of the board-side terminal 30 coincide with each other in plan view. Similarly, each insertion hole 29 of the circuit board 13 and each female screw formed in each collar 22 of the case 12 respectively coincide with each other in plan view. In this state of positioning, the screws Sc are inserted into the insertion holes 31 and are screwed into the screw holes 19 of the case side terminals 18a and 18b, respectively. The terminals 18a and 18b are fixed. When each screw Sc is screwed into the screw hole 19, both terminals are fixed by tightening the screws Sc by applying sufficient rotational torque so that the screws Sc do not easily fall off due to vibration or the like. As the screw Sc, a screw in which a washer is integrated, a screw that is used by attaching a washer formed separately, and the like are used.

  Next, the bracket 11 is stacked on the case 12 while being positioned. Then, each screw Sf is inserted into each insertion hole 29 of the circuit board 13 from each insertion hole 37 of the bracket 11, and is screwed into the female screw formed on each collar 22 of the case 12. To fix.

  Next, the operation of the bent portion 20 and the narrow portion 21 provided in the case side terminal 18a in the electronic device 10 will be described. Since the two case side terminals 18b have the same configuration as the case side terminal 18a, they each have the same function as the case side terminal 18a.

  When the board-side terminal 30 and the case-side terminal 18a are fixed with the screw Sc, a stress in the rotation direction of the screw Sc is generated on the board-side terminal 30. In the present embodiment, since the case-side terminal 18 a is formed in parallel with the bottom wall 15, the stress is a rotational stress on a plane parallel to the bottom wall 15. Even when the board-side terminal 30 is soldered at a position shifted from a predetermined position and the insertion hole 31 and the screw hole 19 do not coincide with each other in a plan view, the bottom wall 15 is fixed. Stress is generated in the direction parallel to.

  Further, when the circuit board 13 is accommodated in the case 12 when the heights of the board-side terminals 30 from the metal board 26 are not the same, a gap is generated between the case-side terminal 18 a and the board-side terminal 30. If the board-side terminal 30 and the case-side terminal 18a are fixed with the screws Sc in this state, stress in a direction perpendicular to the bottom wall 15 is generated. Further, due to the difference in thermal expansion coefficient between the case 12 and the metal substrate 26, the relative positions of the insertion hole 31 and the screw hole 19 vary, and stress in a direction parallel to the bottom wall 15 is generated.

  As described above, the stress applied to the board-side terminal 30 is absorbed by the case-side terminal 18a being deformed. That is, the case-side terminal 18a deforms in the width direction of the case-side terminal 18a with the narrow portion 21 as a base point when stress in the width direction of the case-side terminal 18a is applied in a direction parallel to the bottom wall 15. Absorbs stress. Further, the case side terminal 18a extends in the extending direction of the case side terminal 18a with the bent portion 20 as a base point when stress in the extending direction of the case side terminal 18a is applied in a direction parallel to the bottom wall 15. It deforms and absorbs the stress. Further, when a stress in a direction perpendicular to the bottom wall 15 is applied, the case side terminal 18a is deformed in a direction perpendicular to the bottom wall 15 with the bent portion 20 as a base point to absorb the stress. Further, when a stress in the combined direction is applied, the case-side terminal 18a is deformed with the bent portion 20 and the narrow portion 21 as base points to absorb the stress.

Therefore, in this embodiment, the following effects can be obtained.
(1) Since the case-side terminal 18a extends away from the inner surface (such as the bottom wall 15 and the side wall 16) of the case 12 from the fixed portion 25, the case-side terminal 18a is connected to the case 12 at the free end side. It can be freely swung without being restricted by other structures. That is, it can be said that the screw hole 19 of the case-side terminal 18a is held hollow in the case 12. Further, a bent portion 20 and a narrow portion 21 are provided as a stress relaxation structure between the screw hole 19 and the fixing portion 25 of the case side terminal 18a. For this reason, the stress added to the board | substrate side terminal 30 can be absorbed by the case side terminal 18a, and can be relieved. Therefore, the stress applied to the solder H (soldering portion) that fixes the board-side terminal 30 can be relaxed.

  (2) Between the screw hole 19 and the fixing portion 25 of the case side terminal 18a, a bent portion 20 is formed by bending the case side terminal 18a into an inverted U shape when viewed from the side. For this reason, the case-side terminal 18 a is easily deformed in the extending direction of the case-side terminal 18 a and the direction perpendicular to the bottom wall 15 with the bent portion 20 as a base point. Therefore, the case side terminal 18 a can efficiently relieve the stress in the extending direction of the case side terminal 18 a applied to the board side terminal 30 and the stress in the direction perpendicular to the bottom wall 15.

  (3) A narrow portion 21 formed narrowly is provided between the bent portion 20 and the fixed portion 25 of the case side terminal 18a. For this reason, the case side terminal 18a is easily deformed in the width direction of the case side terminal 18a with the narrow portion 21 as a base point. Therefore, the case side terminal 18a can efficiently relieve the stress in the width direction of the case side terminal 18a applied to the board side terminal 30.

  (4) The board-side terminal 30 and the case-side terminal 18a are fixed by screwing a screw Sc inserted through the insertion hole 31 into the screw hole 19. Therefore, the board side terminal 30 and the case side terminal 18a can be securely fixed.

  (5) The case-side terminal 18 a is formed by being insert-molded and fixed to the side wall 16 and extends from the fixing portion 25 in parallel with the bottom wall 15. For this reason, the entire case-side terminal 18a is likely to swing in a direction perpendicular to the bottom wall 15 with the portion fixed by the fixing portion 25 as a base point. Further, the case side terminal 18a and the board side terminal 30 are easily connected and fixed at a position close to the side wall 16.

  (6) The screw hole 19 into which the screw Sc is screwed is formed by screwing a female screw into a hole formed by burring on the free end side of the case side terminal 18a. The screw hole 19 is separated from the inside of the case 12. For this reason, the configuration of the case 12 is simplified and the relative position of the board-side terminal 30 and the female screw is the same as that of the case 12 as compared with the case where the nut is insert-molded to form the female screw (see FIG. 5). Fluctuation depending on thermal expansion can be suppressed.

  (7) In the present embodiment, the case terminal member 14 is insert-molded so that both ends thereof protrude outward and inward of the case 12 to form the case side terminal 18a and the connector portion terminal 17a. Similarly, the case side terminal 18b and the connector portion terminal 17b were formed. Therefore, the case side terminals 18a and 18b and the connector portion terminals 17a and 17b can be easily formed on the case 12.

In addition, you may change the said embodiment as follows.
In the present embodiment, only one bent portion 20 is provided, but a plurality of bent portions 20 may be formed. That is, as shown in FIG. 4A, two bent portions 20 protruding from the case side terminal 18a in the direction opposite to the bottom wall 15 (in the opening side direction of the case 12) may be provided, or three or more. It may be provided. At this time, the folded portion 20a formed between the plurality of bent portions 20 is formed such that the tip of the folded portion 20a does not protrude from the case side terminal 18a to the bottom wall 15 side. With this configuration, the case-side terminal 18 a is easily deformed in the extending direction of the case-side terminal 18 a and the direction perpendicular to the bottom wall 15.

  In this embodiment, as shown in FIG. 4B, two bent portions 20 are provided, and the bent portion 20 on the fixed portion 25 side is formed so as to protrude from the case side terminal 18a toward the bottom wall 15. In addition, the bent portion 20 on the free end side may be formed so as to protrude from the case side terminal 18a in the direction opposite to the bottom wall 15. That is, the two bent portions 20 are respectively in opposite directions (case side) around the formation surface of the case side terminal 18a specified from the length along the extending direction of the case side terminal 18a and the length along the width direction. It is formed so as to protrude in the thickness direction of the terminal 18a. In this case, the bent portion 20 on the fixed portion 25 side is formed so as to protrude in a direction opposite to the bottom wall 15 from the case side terminal 18a, and the bent portion 20 on the free end side is formed from the case side terminal 18a to the bottom wall 15. You may form so that it may protrude toward. When three or more bent portions 20 are provided, at least one of the bent portions 20 may be provided so as to protrude from the case side terminal 18a in a direction opposite to the direction in which the other bent portions 20 protrude. With this configuration, the case-side terminal 18 a is easily deformed in the extending direction of the case-side terminal 18 a and the direction perpendicular to the bottom wall 15.

  As shown in FIG. 4C, in this embodiment, a thin portion 20c in which the thickness of the case side terminal 18a is formed thin may be provided instead of the bent portion 20. Even if comprised in this way, since the thin part 20c is easy to deform | transform, stress can be relieved.

  In the present embodiment, the case side terminal 18 a is insert-molded and fixed to the side wall 16, but may be insert-molded and fixed to the bottom wall 15. That is, as shown in FIG. 4 (d), the case side terminal 18 a is bent so as to be parallel to the bottom wall 15 from a standing portion 40 that is erected vertically from the bottom wall 15, and then again the bottom wall 15. The bent portion 20a may be formed by folding back toward the standing portion 40 in parallel with the bent portion 20, and the bent portion 20 may be further extended in parallel with the bottom wall 15. Further, the narrow portion 21 is formed in the standing portion 40. Even if comprised in this way, since the case side terminal 18a is easy to deform | transform using the bending part 20 and the narrow part 21 as a base point, it can relieve | moderate stress. Further, the case side terminal 18 a can be provided at a position away from the side wall 16 while reducing the portion exposed to the inside of the case 12.

  In the present embodiment, a stress relaxation structure may be provided between the insertion hole 31 of each board-side terminal 30 and a portion (soldered portion) fixed via the solder H. As a stress relaxation structure provided in each substrate side terminal 30, for example, a narrow part or a bent part provided in the case side terminal 18a of the present embodiment may be formed. With this configuration, the stress can be relaxed by both the case side terminal 18 a and the board side terminal 30.

  In the present embodiment, the bent portion 20 protrudes from the case side terminal 18a in the direction opposite to the bottom wall 15, but may be protruded from the case side terminal 18a toward the bottom wall 15. Even if comprised in this way, the case side terminal 18a becomes easy to deform | transform into the extending direction of the case side terminal 18a and the direction perpendicular | vertical to the bottom wall 15. FIG.

  In the present embodiment, the case side terminal 18a may be provided with either the bent portion 20 or the narrow portion 21. Even if comprised in this way, the case side terminal 18a can relieve | moderate stress.

In the present embodiment, the narrow portion 21 is disposed closer to the fixed portion 25 than the bent portion 20, but the bent portion 20 may be disposed closer to the fixed portion 25 than the narrow portion 21.
In this embodiment, you may form the notch part 21a and the narrow part 21 in the folding | returning part 20a of the bending part 20, or the upright part 20b. Even in this configuration, the case-side terminal 18a is easily deformed in a direction parallel to the bottom wall 15 with the narrow portion 21 as a base point.

In the present embodiment, three case side terminals 18a and 18b and substrate side terminal 30 are formed, but two may be formed.
In this embodiment, although two connector part terminals 17a and 17b for electrically connecting with the outside are provided, it is good also as three. In this case, the three connector portion terminals are formed integrally with the case side terminal 18a and the two case side terminals 18b so as to be in one-to-one correspondence. Moreover, it is good also as four or more connector part terminals.

  In the present embodiment, the screw hole 19 is formed by screwing a female screw into a hole formed by burring, but a screw hole may be formed directly on the case side terminal 18a by cutting or the like. In addition, the case side terminal 18a may be provided with an insertion hole, and the screw hole may be formed by welding and fixing a nut so that the female screw faces the insertion hole.

  In the present embodiment, the cutout portion 21a may have a semicircular shape in plan view. Even if formed in this way, the narrow portion 21 can be formed, and the case-side terminal 18a can be deformed with the narrow portion 21 as a base point.

  In the present embodiment, the cutout portions 21a may not be formed at both ends with respect to the width direction, but may be formed only at one end. Even if formed in this way, the narrow portion 21 can be formed, and the case-side terminal 18a can be deformed with the narrow portion 21 as a base point.

In the present embodiment, a plurality of narrow portions 21 may be provided.
In the present embodiment, the bent portion 20 may be provided so as to protrude obliquely from the case side terminal 18a.

  In the present embodiment, the case-side terminal 18 a may not extend so as to be parallel to the bottom wall 15. That is, the case-side terminal 18a may extend from the fixed portion 25 so as to incline toward the bottom wall 15, or conversely, from the fixed portion 25 to incline in the opposite direction to the bottom wall 15. It may be extended.

  In the present embodiment, the case side terminal 18 a may be formed to be perpendicular to the bottom wall 15. In this case, the free end side of the board-side terminal 30 is configured to be perpendicular to the bottom wall 15 of the case 12 and parallel to the case-side terminal 18 a in a state where the circuit board 13 is accommodated in the case 12. Even if comprised in this way, the case side terminal 18a can rock | fluctuate freely.

The disassembled perspective view of the bracket which comprises an electronic device, a circuit board, and a case. (A) is the elements on larger scale of the periphery of the connector part of a case, (b) is an AA sectional view. The fragmentary sectional view which shows the fixed state of a terminal. (A)-(d) is a side view of the case side terminal in another example. The fragmentary sectional view of the electronic device of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Electronic device, 12 ... Case, 13 ... Circuit board, 15 ... Bottom wall, 16 ... Side wall, 17a, 17b ... Connector part terminal, 18a, 18b ... Case side terminal, 19 ... Screw hole, 20 ... Bending part, 21 ... narrow part, 21a ... notch part, 25 ... fixing part, 30 ... substrate side terminal, 31 ... insertion hole, 40 ... standing part, H ... solder, Sc ... screw, Sf ... screw.

Claims (6)

A resin case for housing a circuit board on which electronic components are mounted;
Board-side terminals fixed to the circuit board with solder;
A connector terminal that is formed so as to protrude outside the case and electrically connects the circuit board housed in the case and the outside;
A plate-like case-side terminal formed integrally with the connector part terminal, and fixed by insert molding so as to be disposed inside the case;
In the electronic device for connecting and fixing the board side terminal and the case side terminal with screws,
The case-side terminal extends from a fixed portion that is insert-molded and fixed to the case so as to be separated from the inner surface of the case, and is fixed to the board-side terminal with the screw in the extended portion. An electronic apparatus comprising: a connecting portion to be provided, wherein a stress relaxation structure is provided between the connecting portion and the fixing portion.   2. The stress relaxation structure includes a narrow portion formed by cutting out an edge in a width direction of the case side terminal, and a bent portion formed by bending the case side terminal. The electronic device as described in. The board-side terminal is formed with an insertion hole for the screw, while the connection portion of the case-side terminal is formed with an internal thread portion into which the screw is screwed, integrally with the case-side terminal. And
The electronic device according to claim 1, wherein the board-side terminal and the case-side terminal are fixed by screwing the screw inserted through the insertion hole into the female screw portion.   The said case is formed in the box shape which has a side wall, The said case side terminal was insert-molded and fixed to the said side wall, The electron as described in any one of Claims 1-3 characterized by the above-mentioned. machine.   The said case is formed in the box shape which has a bottom wall, The said case side terminal was insert-molded and fixed to the said bottom wall, The Claim 1 characterized by the above-mentioned. Electronic equipment.   The stress relaxation structure includes a plurality of bent portions formed by bending the case side terminal so as to protrude in a direction perpendicular to the extending direction of the case side terminal and along the thickness direction of the case side terminal. And at least one of the bent portions protrudes in a direction opposite to a direction in which the other bent portion protrudes around the case-side terminal. The electronic device as described in the paragraph.

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