JP7441641B2 - Board mounting structure and board mounting method - Google Patents

Description

The disclosed embodiments relate to a substrate mounting structure and a substrate mounting method.

Conventionally, a board mounting structure has been proposed for easily mounting a board to a holder such as a sheet metal while positioning the board to the holder.

For example, in Patent Document 1, in a structure in which the substrate is positioned by engaging a protrusion provided on the holder with a through hole of the substrate, the guide portion is centered while the substrate is brought into contact with the guide portion protruding from the holder. A technique is disclosed in which the positioning protrusion and the substrate through-hole are easily aligned by rotating the substrate as an axis.

Japanese Patent Application Publication No. 2016-004798

However, the conventional technology leaves room for further improvement in easily attaching the substrate to the holder while suppressing the floating of the substrate.

For example, before the board is fixed to the holder with screws or the like, a vertically upward load may be applied to the board. This load is due to the reaction force of, for example, FPC (Flexible Printed Circuits) (hereinafter referred to as "flexible"), a leaf spring, a heat dissipation sheet, etc., provided between the substrate and the holder.

In the conventional technology described above, in such a case, the board lifts up and the positioning protrusion and the board through-hole disengage from each other before the board is fixed. It was necessary to hold down.

One aspect of the embodiment has been made in view of the above, and it is an object of the present invention to provide a substrate mounting structure and a substrate mounting method that can easily attach a substrate to a holder while suppressing floating of the substrate.

A board mounting structure according to one aspect of the embodiment is a board mounting structure for mounting a board to a plate-shaped holder, and includes a wall, a recess, a flexible board, and a locking part. A plurality of the wall portions are provided on the holder so as to stand on the same straight line with respect to a plane of the holder. The recess is provided at a position corresponding to the wall on one side of the substrate on which a load for floating the substrate acts . The flexible substrate is folded back at a position corresponding to the one side of the substrate, thereby generating a load that lifts the substrate. The locking portion is provided on the wall portion so as to be bent toward the substrate, and locks the substrate against the floating portion of the substrate. Further, after the substrate contacts the recessed portion with the wall portion, the substrate is rotated about the one side as a rotation center axis until it becomes parallel to the holder, and then fixed.

According to one aspect of the embodiment, the substrate can be easily attached to the holder while suppressing floating of the substrate.

FIG. 1 is a perspective view showing a configuration example of a holder according to an embodiment. FIG. 2 is an enlarged view of the M1 section shown in FIG. FIG. 3 is an enlarged view of the M2 section shown in FIG. FIG. 4 is a plan view showing an example of the structure of the substrate according to the embodiment. FIG. 5 is a diagram (part 1) showing the procedure for assembling the board. FIG. 6 is a diagram (part 2) showing the procedure for assembling the board. FIG. 7 is a diagram (part 3) showing the procedure for assembling the board. FIG. 8 is a diagram (part 1) showing a configuration example of a bent wall portion according to a modification. FIG. 9 is a diagram (part 2) showing a configuration example of a bent wall portion according to a modification. FIG. 10 is a diagram (part 1) showing a configuration example of a positioning claw according to a modification. FIG. 11 is a diagram (part 2) showing a configuration example of a positioning claw according to a modification. FIG. 12 is a diagram (part 1) showing a modification example in which the reaction force of the flexible substrate acts to float the substrate. FIG. 13 is a diagram (part 2) showing a modification example in which the reaction force of the flexible film acts to float the board. FIG. 14 is a diagram (part 3) showing a modification example in which the reaction force of the flexible substrate acts to float the board. FIG. 15 is an explanatory diagram (part 1) of the degree of freedom of the substrate before fixing with screws. FIG. 16 is an explanatory diagram (Part 2) of the degree of freedom of the substrate before fixing with screws.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a substrate mounting structure and a substrate mounting method disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below.

Further, in order to make the explanation easier to understand, each of the drawings shown below appropriately depicts a three-dimensional orthogonal coordinate system including a Z axis whose positive direction is vertically upward.

FIG. 1 is a perspective view showing a configuration example of a holder 10 according to an embodiment. Moreover, FIG. 2 is an enlarged view of the M1 section shown in FIG. Further, FIG. 3 is an enlarged view of the M2 section shown in FIG. 1.

As shown in FIGS. 1 to 3, the holder 10 includes a bent wall portion 11, a positioning claw 12, and a seat surface 13. The holder 10 is a support body for the substrate 20 to which the substrate 20 (see FIG. 4 and subsequent figures) is attached and supports the substrate 20 on the XY plane, and is provided by, for example, sheet metal molding.

The bent wall portion 11 is a guide member for assembling the board, and is provided at at least two locations on the same straight line parallel to the X-axis so as to stand upright with respect to the XY plane. As shown in FIG. 2, the bent wall portion 11 has a convex portion 111. The convex portion 111 is provided by a dowel, a half-cut, or the like so as to protrude in a convex shape toward the substrate 20 side (here, in the negative direction of the Y-axis). The convex portion 111 may be provided at the tip of the bent wall portion 11.

The positioning claws 12 are members for positioning the substrate, and are provided at at least two locations so as to stand up against the XY plane. The positioning pawl 12 engages with a positioning hole 22 of a substrate 20, which will be described later.

The seat surface 13 is a screw seat surface for fixing the board, and is provided at at least three locations. The seat surface 13 engages with a screw fixing hole 23 of a base plate 20, which will be described later.

Next, a configuration example of the substrate 20 will be described. FIG. 4 is a plan view showing an example of the structure of the substrate according to the embodiment. As shown in FIG. 4, the substrate 20 includes a recess 21, a positioning hole 22, and a screw fixing hole 23.

The recess 21 is a concave portion that engages with the bent wall portion 11 of the holder 10 (see section M3 in the figure). The concave portion 21 and the bent wall portion 11 are formed by a straight line drawn from the center of gravity CG of the substrate 20 to the point of application PL where the greatest load for floating the substrate 20 acts when the substrate 20 is assembled to the holder 10. It is provided on one side of the substrate 20 that intersects with.

The positioning hole 22 is formed in a shape that engages with the positioning pawl 12 at a position where it engages with the positioning pawl 12 of the holder 10 . The screw fixing hole 23 is formed at a position to engage with the seat surface 13 of the holder 10.

Next, a procedure for assembling the substrate 20 to the holder 10 will be described. 5 to 7 are diagrams (part 1) to (part 3) showing the procedure for assembling the board 20. Note that FIG. 6 is a schematic cross-sectional view passing through the center of the convex portion 111, the positioning pawl 12, and the seat surface 13.

When assembling the substrate 20 to the holder 10, as shown in FIGS. 5 and 6, first align the concave portion 21 of the substrate 20 with the bent wall portion 11, and insert it under the convex portion 111 (see arrow a1 in the figure). .

Then, the positioning pawl 12 is inserted into the positioning hole 22 by rotating the contact point between the convex part 111 and the concave part 21 as a fulcrum (see arrow a2 in the figure). Note that even if a load is applied to the substrate 20 in the positive direction of the Z-axis, the substrate 20 is inserted under the convex portion 111 and is supported by the convex portion 111, so the substrate 20 is It never floats.

Then, as shown in FIG. 7, the screws are inserted into the screw fixing holes 23 and tightened, so that the board 20 is completely fixed to the holder 10.

By the way, although it has been decided to provide the convex part 111 on the bent wall part 11 so far, it is also possible to raise the substrate 20 equivalent to the convex part 111 by bending the tip of the bent wall part without providing the convex part 111. A prevention function can be realized. Next, such a modification will be explained.

FIGS. 8 and 9 are diagrams (Part 1) and (Part 2) showing a configuration example of a bent wall portion 11A according to a modification. Note that FIG. 8 corresponds to FIG. 2, and FIG. 9 corresponds to FIG. 6, respectively.

As shown in FIGS. 8 and 9, the bent wall portion 11A according to the modification has a bent portion 111A at the tip. As shown in FIG. 9, the bent portion 111A is provided so that the tip of the bent portion 111A is bent toward the substrate 20 side. At this time, the bent portion 111A is provided so as to form an obtuse angle with respect to the extending direction of the proximal end side of the bent wall portion 11 (here, the positive direction of the Z axis).

In this way, by providing the bent portion 111A to form an obtuse angle, when inserting the board 20 (see arrow a1 in the figure), the degree of freedom of the insertion angle can be increased, in other words, the insertion angle can be increased. It is possible to improve the work efficiency of the operator.

Furthermore, as shown in FIG. 9, the case where the apex position P of the positioning pawl 12 is on the central axis of the positioning pawl 12 has been exemplified so far. It may be moved toward the center, in other words, toward the bent wall portions 11 and 11A. Next, examples of such changes will be explained.

10 and 11 are diagrams (Part 1) and (Part 2) showing a configuration example of a positioning claw 12A according to a modification. Note that FIG. 10 corresponds to FIG. 9. FIG. 11 is an enlarged view of the vicinity of the positioning claw 12A in FIG. 10.

As shown in FIG. 10, the positioning claw 12A according to the modified example is provided with the apex position P closer to the rotation center side of the board 20 at the time of assembly. As a result, the clearance between the peripheral wall of the positioning hole 22 of the board 20 and the tip of the positioning claw 12A can be increased, and the operator's work when rotating the board 20 and inserting the positioning claw 12A into the positioning hole 22 is increased. can improve sex.

Note that, as shown in FIG. 11, the positioning claw 12A has a tip portion 121A including the apex position P, and a straight portion 122A extending parallel to the Z axis. It is preferable that the tip portion 121A has a rounded shape according to the rotation locus of the positioning hole 22. This makes it easier to draw the positioning pawl 12A into the positioning hole 22 when inserting the positioning pawl 12A.

Further, as shown in the figure, the length L of the straight portion 122A from the top surface of the holder 10 is preferably greater than the height h of the seat surface 13. Thereby, the peripheral wall portion of the positioning hole 22 and the straight portion 122A can interfere with each other, and the movement of the substrate 20 in the XY plane direction can be restricted. Although not shown in the drawings, the positioning claw 12 similarly has a tip portion 121 and a straight portion 122, and the relationship between the length L and height h described above is also the same.

Next, an example in which the flexible printed circuit board 30 is folded back by 180 degrees and wired under the board 20 will be described. 12 to 14 are diagrams (part 1) to (part 3) showing modification examples in which the reaction force of the flexible printed circuit board 30 acts to float the substrate 20.

As shown in FIG. 12, consider the case where the flexible printed circuit board 30 is folded back 180 degrees and wired below the substrate 20. In such a case, the reaction force of the folded flexible board 30 acts to float the substrate 20.

In such a case, it is preferable to make a crease f in advance on the flexible printed circuit board 30, as shown in the figure. In the example shown in the figure, a valley fold crease f is inserted. By creating the fold f in this way and making it work like a hinge, the rotation locus of the board 20 can be stabilized when the board 20 is rotated during assembly, and the reaction force itself from the flexible board 30 can be reduced. It is possible to improve the work efficiency of the operator.

As shown in FIG. 13, the fold f is provided near one side of the substrate 20, which is the rotation center axis axC, and parallel to the rotation center axis axC. Note that the vicinity of one side of the board 20 referred to here refers to, for example, any position on the extension line of the bottom surface of the board 20 inserted toward the bent wall portions 11, 11A, as shown in FIG. It is. Thereby, for example, when the board 20 is inserted, the flexible board 30 can be quickly valley-folded, the reaction force of the flexible board 30 can be reduced, and the rotation trajectory of the board 20 can be stabilized.

(effect)
Next, effects of the board mounting structure according to the embodiments described so far will be described. According to the board mounting structure according to the embodiment, the following effects (1) to (10) can be expected.

(1) Structure in which the board 20 receives the reaction force of the flexible cable 30, the reaction force from conductive parts (plate springs, etc.) between the board 20 and the holder 10, the reaction force of the heat dissipation sheet between the board 20 and the holder 10, etc. In this case, floating of the substrate 20 from the holder 10 before being fixed with screws can be prevented.

(2) In the work of fixing the substrate 20, there is no need for the operator to hold the substrate 20 by hand or with a jig.

(3) With respect to the center of gravity CG of the board 20, by providing the bent wall portions 11, 11A and the lifting prevention structure (the convex portion 111, the bent portion 111A) on one side of the board 20 near the position where the lifting factor load occurs, It is possible to suppress the moment due to the load that causes floating, and it is possible to suppress floating more effectively.

(4) Since the bent walls 11 and 11A, the positioning claws 12 and 12A, and the seat surface 13 can be integrally molded with the holder 10, there is no need to use separate dedicated parts to prevent floating.

(5) When the convex portion 111 is formed by dowels or half-blanking, it can be formed even if the holder 10 is made of a thick sheet metal, and the strength of the holder 10 can be ensured at the same time.

(6) Since the board 20 is assembled to the holder 10 by a rotation locus without sliding movement, it is possible to prevent the mounted components of the board 20 from being damaged due to contact with the uneven shape of the holder 10.

(7) The degree of freedom of the board 20 before being fixed with screws can be restricted to a minimum. This will be specifically explained using FIGS. 15 and 16. FIGS. 15 and 16 are explanatory diagrams (Part 1) and (Part 2) of the degrees of freedom of the substrate 20 before being fixed with screws.

As shown in FIG. 15, movement in the positive direction of the Z-axis (see arrow a3) and rotational movement from the Y-axis direction to the Z-axis direction (see arrow a4) are performed by the convex portion 111 or the bent portion 111A. It can be restrained by being locked.

Further, movement in the positive and negative directions of the Y axis (see arrow a5) can be suppressed by the positioning claws 12 and 12A. Further, movement in the negative direction of the Z axis (see arrow a6) can be suppressed by the seat surface 13.

Further, regarding rotational movement from the Z-axis direction to the Y-axis direction (see arrow a7), only rotation around the aforementioned rotation center axis axC, that is, rotation along the rotation locus at the time of assembly is possible. Movement of the rotation radius smaller than the rotation locus at the time of assembly can be suppressed by interference between the straight portions 122, 122A of the positioning claws 12, 12A and the peripheral wall portion of the positioning hole 22.

In addition, as shown in FIG. 16, for rotational movement from the X-axis direction to the Y-axis direction and rotational movement from the Y-axis direction to the X-axis direction (see arrows a8 and a9), at least two positioning claws are used. It can be suppressed by 12, 12A. Therefore, the degree of freedom of the board 20 before being fixed with the screws can be restricted to a minimum so that the board 20 can only be removed along the same rotational trajectory during assembly.

(8) By forming the bent portion 111A at an obtuse angle instead of 90°, the insertion angle of the board 20 during assembly can be increased, and the workability of the operator can be improved.

(9) By arranging the apex position P of the positioning pawl 12A closer to the rotation center axis axC, the clearance between the peripheral edge of the positioning hole 22 of the substrate 20 and the tip of the positioning pawl 12A can be increased, and the substrate 20 can be The operator's work efficiency when rotating and inserting the positioning claw 12A into the positioning hole 22 can be improved.

(10) By providing a fold on the flexible board 30 and making it work like a hinge, the rotation locus of the board 20 during assembly can be stabilized. Furthermore, this makes it possible to suppress the generation of tensile load or torsional load on the flexible cable 30 due to deviation of the rotation locus, and to reduce the risk of disconnection of the flexible cable 30. Furthermore, since the reaction force of the flexible cable 30 itself can be reduced, the work efficiency of the operator can be improved.

As described above, the board mounting structure according to the present embodiment is a board mounting structure in which the board 20 is mounted to the plate-shaped holder 10, and the holder 10 has bent wall portions 11 and 11A (“wall portion”). (equivalent to one example). A plurality of bent wall portions 11 and 11A are provided on the same straight line so as to stand upright with respect to the plane of the holder 10. The substrate 20 includes a recess 21 . The recessed portion 21 is provided at a position corresponding to the bent wall portions 11 and 11A on one side closer to the point of application PL where the load for floating the substrate 20 acts most strongly. Further, after the substrate 20 brings the concave portion 21 into contact with the bent wall portions 11 and 11A, the substrate 20 is rotated with the above-mentioned side as the rotation center axis axC until it becomes parallel to the holder 10, and then fixed.

Therefore, according to the substrate mounting structure according to the embodiment, it is possible to easily attach the substrate to the holder while suppressing floating of the substrate.

Further, the bent wall portions 11 and 11A have a convex portion 111 or a bent portion 111A (corresponding to an example of a “locking portion”) that locks the substrate 20 against the floating portion of the substrate 20.

Therefore, the board mounting structure according to the embodiment can achieve the effects described in (1) to (4) above.

Further, the convex portion 111 is provided so as to protrude in a convex shape toward the substrate 20 .

Therefore, according to the board mounting structure according to the embodiment, the effects described in (1) to (5) above can be achieved.

Further, the bent portion 111A is provided so as to be bent toward the substrate 20.

Therefore, the board mounting structure according to the embodiment can achieve the effects described in (1) to (4) above.

Further, the bent portion 111A is provided so as to form an obtuse angle with respect to the extending direction on the proximal end side of the bent wall portion 11A.

Therefore, according to the board mounting structure according to the embodiment, the effect described in (8) above can be achieved.

Further, a plurality of holders 10 are provided so as to stand upright with respect to the plane of the holder 10, and when the substrate 20 becomes parallel to the holder 10, the holders 10 are positioned so as to be inserted into positioning holes 22 formed in the substrate 20. It has a claw 12.

Therefore, according to the board mounting structure according to the embodiment, the effects described in (6) and (7) above can be achieved.

Further, the positioning pawl 12A is provided in an upright manner with the apex position P shifted toward the rotation center axis axC.

Therefore, according to the board mounting structure according to the embodiment, the effect described in (9) above can be achieved.

Further, the positioning claws 12, 12A have straight portions 122A extending perpendicularly from the plane of the holder 10, and when the substrate 20 is parallel to the holder 10, the straight portions 122A extend at least on the peripheral wall of the positioning hole 22. It has a length that interferes with the

Therefore, according to the board mounting structure according to the embodiment, the effect described in (7) above can be achieved.

In addition, in the embodiment mentioned above, the flexible cable 30 is an FPC, but it may be an FFC (Flexible Flat Cable).

Further, although not described in the above-described embodiment, the holder 10 may be provided with a wall portion parallel to the side of the substrate 20 that is perpendicular to one side of the substrate 20 that contacts the bent wall portions 11 and 11A. This contributes to stabilizing the rotation locus of the substrate 20, and when the substrate 20 becomes parallel to the holder 10, movement of the substrate 20 in the positive and negative directions of the X-axis can be more strongly inhibited.

Further advantages and modifications can be easily deduced by those skilled in the art. Therefore, the broader aspects of the invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various changes may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

10 Holder 11, 11A Bending wall portion 12, 12A Positioning claw 13 Seat surface 20 Board 21 Recessed portion 22 Positioning hole 23 Screw fixing hole 30 Flexible board 111 Convex portion 111A Bent portion 121, 121A Tip portion 122, 122A Straight portion CG Center of gravity P Vertex position axC rotation center axis f crease

Claims (6)

A board mounting structure for mounting a board to a plate-shaped holder,
a plurality of wall portions provided on the holder so as to stand on the same straight line with respect to a plane of the holder;
a recess provided in the substrate at a position corresponding to the wall portion on one side on which a load for floating the substrate acts ;
a flexible substrate that generates a load that lifts the substrate by being folded back at a position corresponding to the one side of the substrate;
a locking portion provided on the wall portion so as to be bent toward the substrate, and locking the substrate against the floating portion of the substrate;
The substrate is
After the recess is brought into contact with the wall, it is rotated about the one side as a rotation center axis until it becomes parallel to the holder, and then fixed .
Board mounting structure. The locking portion is provided so as to form an obtuse angle with respect to the extending direction of the proximal end side of the wall portion .
The board mounting structure according to claim 1. The holder is
A plurality of positioning claws are provided so as to stand up against the plane of the holder, and are inserted into positioning holes formed in the substrate when the substrate is parallel to the holder .
The board mounting structure according to claim 1 or 2. The positioning claw is provided in an upright manner with the apex position closer to the rotation center axis .
The board mounting structure according to claim 3. The positioning claw has a straight portion extending perpendicularly from the plane of the holder,
The straight portion has a length that interferes with at least a peripheral wall portion of the positioning hole when the substrate is parallel to the holder .
The board mounting structure according to claim 3 or 4. A plate-like holder has a plurality of wall parts installed on the same straight line so as to stand up against the plane of the holder, and a wall part on one side on which a load that makes the board float is applied to the board. a recess provided at a corresponding position; a flexible board that is folded back at a position corresponding to the one side of the board to generate a load that lifts the board; and a flexible board provided in the wall part so as to be bent toward the board. A board mounting method for mounting the board to the holder using a board mounting structure including a locking portion that locks the board to the float of the board, the method comprising:
A method for attaching a board , the method comprising: abutting the recessed part against the wall, then rotating the board using the one side as a center axis of rotation until the board is parallel to the holder, and then fixing the board.

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