JP2004214329A - Fitting structure of printed board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting structure of a printed board of high workability. <P>SOLUTION: On a base body 2 where a boss 10 is protruded, a printed board 3 where an opening 5 is provided at such a part as faces the boss 10 is placed. A substrate holding member 20 is placed on the printed board 3. A screw 4 is screwed from outside the substrate holding member 20 to fit the printed board 3 to the base body 2 together with the substrate holding member 20. Tips 12a and 12b of the boss 10 engage with top faces 24a and 24b of the recess formed on the bottom of the substrate holding member 20. This engagement locks joint revolution of the substrate holding member 20 when the screw 4 is screwed, while a protruding part 21 allows visual recognition of engagement direction, resulting in a fitting structure of the printed board of high workability. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for mounting a printed circuit board on a base with screws.
[0002]
[Prior art]
As shown in FIG. 5A, in order to attach the printed board 103 to a base 101 made of, for example, a synthetic resin, a boss 102 having a screw hole (not shown) is protruded from the base 101 and the printed board 103 is provided. In a portion facing the boss portion 102, a through hole (not shown) through which a screw is inserted is provided, a printed circuit board is mounted on the base 101, and the screw 104 is attached to the boss portion from outside the printed circuit board 103. A structure in which a screw hole 102 is used to fasten the screw hole is often used.
[0003]
In the mounting structure as described above, as shown in FIG. 5B, a board holding member 109 having a certain height is arranged on a printed board 107, and a screw 108 is screwed in from outside the board holding member 109. There is also a case where the printed board 107 is attached to the base 105 such that the printed board 107 is sandwiched between the board holding member 109 and the board holding member 109.
[0004]
Such a board holding member uses, for example, screws for assembling other components constituting the apparatus, and when the screws are too long to be used directly for mounting the printed circuit board to the base, The screw serves as an offset for adjusting the length into which the screw is inserted, so that the screw is used as a standard screw for mounting the printed circuit board on the base. This makes it possible to avoid using a plurality of types of screws in the assembling work of the device, to increase the working efficiency, and to reduce the parts management cost.
[0005]
Here, when the above-mentioned substrate holding member is used, it is necessary to prevent the substrate holding member from rotating together with the rotation when the screw is screwed in, from the viewpoint of working efficiency, and also that the wiring pattern is It is desirable from the viewpoint of protection if it exists under or in the vicinity of. Conventionally, as a mechanism for preventing other members from rotating together with the rotation of a screw or the like, locking by a stopper has been proposed (for example, see Patent Document 1). In Patent Document 1, as shown in FIG. 6, a stopper is provided on a bracket 201 to prevent the projecting piece 202 from rotating together by screwing a bolt 203 when attaching the projecting piece 202 to a bracket 201 as a base. It is described that the part 204 is protruded.
[0006]
[Patent Document 1]
JP-A-2002-264759
[Problems to be solved by the invention]
However, since various electronic components are mounted on the printed circuit board and a wiring pattern is formed thereon, it is difficult to provide a structure such as a stopper described in Patent Document 1 thereon. In order to prevent the board holding member from rotating together, a measure suitable for mounting a printed board is required.
[0008]
In view of the above problems, an object of the present invention is to provide a printed circuit board mounting structure for improving workability in a printed circuit board mounting structure for mounting a printed circuit board to a base together with a substrate holding member by screws.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a printed circuit board mounting structure according to claim 1, wherein a printed circuit board having an opening at a portion opposed to the boss is placed on a base having a boss protruded. Mounting a board holding member on the printed board, screwing a screw from the outside of the board holding member, and attaching the printed board to the base together with the board holding member; At the time of insertion, a portion of the bottom of the substrate holding member that faces the tip of the boss through the opening of the printed circuit board so that the co-rotation of the substrate holding member is locked, It is characterized in that it is configured to fit with the tip.
[0010]
Also, in the printed circuit board mounting structure according to the second aspect, in the printed circuit board mounting structure according to the first aspect, the front end of the boss portion is a first end surface and one step lower than the first end surface. A second end face formed, wherein the first end face and the second end face protrude from an opening of the printed circuit board, and a portion of the bottom of the board holding member, which fits into a tip of the boss portion. Is a recess for accommodating the protruding portion, and has a first top surface having substantially the same shape as the first end surface, and a step having substantially the same size as a step between the first end surface and the second end surface. A second top surface which is formed to be shallower than the first top surface with a step and has a substantially same shape as the second end surface is provided.
[0011]
According to a third aspect of the present invention, in the mounting structure of a printed board according to the first or second aspect, the board holding member is fitted on the surface of the printed circuit board with the tip of the boss. It is characterized by having marks indicating possible directions.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings, using a side decoration member in a pachinko machine as an example. FIG. 1 is an exploded perspective view of a main part of the side decoration member 1 as viewed from the back. The side decoration member 1 is provided with an unillustrated electric decoration device to add interest to the game in the pachinko machine. In the present embodiment, the base 2 of the printed circuit board 3 mounted with an electronic circuit for the control and the like is provided. The mounting on the printed circuit board is performed using the printed circuit board mounting structure according to the present invention. Note that, on the printed circuit board 3, the electronic components and the wiring patterns are assumed to be mounted on the front side in FIG.
[0013]
In FIG. 1, a base 2 according to the present invention is provided with a boss 10 according to the present invention in a protruding manner, and the distal end thereof has a structure having a step described later. In addition, a rib 11 formed lower than the boss portion 10 is provided on the base 2 so as to extend substantially along the outer periphery of the printed circuit board 3. In the printed circuit board 3 according to the present invention, the openings 5 are formed in portions facing the respective boss portions 10 and are mounted on the base 2. In the present embodiment, the hole diameter of the openings 5 is The printed board 3 is set on the rib 11 so that the tip of the boss 10 protrudes from the opening 5 so as to be slightly larger than the outer diameter of the boss 10. The mounting structure for a printed board according to the present invention is such that the board holding member 20 according to the present invention is placed on each opening 5 of the printed board 3 and the screw 4 is screwed in from the outside thereof. The printed board 3 is attached to the base 2 so that the printed board 3 is sandwiched between the printed board 3 and the ribs 2 (in the present embodiment, the ribs 11 protruding from the base 2). At this time, the bottom of the substrate holding member 20 is provided with a recess formed with a step that fits into a step at the tip of the boss 10 described later, and the substrate holding member is rotated by the screw 4 when the screw 4 is inserted. 20 are locked together.
[0014]
FIG. 2 is a perspective view of the boss 10. The boss portion 10 is formed in a substantially columnar shape, and the tip end portion 12 has a semicircular first end surface 12a and a semicircular second end surface formed one step lower than the first end surface 12a. It is formed from the end face 12b. A screw hole 13 is formed at the center of the tip 12 in a direction perpendicular to the base 2. The screw hole 13 is formed in the distal end portion 12 so as to straddle the first end surface 12a and the second end surface 12b. Further, a rib 11 having a predetermined dimension, which will be described later, and being formed lower than the tip 12 is provided around the boss 10.
[0015]
FIG. 3 is a perspective view of the substrate holding member 20. FIG. 3A is a perspective view of the substrate holding member 20 viewed from its front surface, and FIG. 3B is a perspective view of the substrate holding member 20 viewed from its back surface. (B) has a positional relationship in which the vertical direction is fixed and the front and back are reversed. As shown in FIGS. 3A and 3B, the substrate holding member 20 has a substantially columnar shape, and a screw hole 23 penetrating the front and back is formed at the center thereof. As shown in FIG. 3B, a concave portion 24 is formed on the back surface 25 of the substrate holding member 20 with a circular opening concentric with a circle forming the outer shape, and the top surface of the concave portion has a semicircular shape. It comprises a first top surface 24a to be formed, and a semicircular second top surface 24b formed one step deeper than the first top surface 24a. The above-mentioned screw hole 23 is formed in the recess 24 so as to straddle the first top surface 24a and the second top surface 24b.
[0016]
Here, in the present embodiment, the outer diameter of the concave portion 24 is set slightly larger than the outer diameter of the boss portion 10 described above, and after the printed board 3 is placed on the rib 11 as described above, When the member 20 is placed on the opening 5, the tip 12 of the boss 10 protruding from the opening 5 can be accommodated in the recess 24. At this time, the step between the first end surface 12a and the second end surface 12b forming the tip 12 of the boss 10 and the step between the first top surface 24a and the second top surface 24b of the recess 24 are as follows. The tip 12 of the boss 10 has a first end surface 12a that abuts with a first top surface 24a of the recess 24, and a second end surface 12b that faces the second top surface of the recess 24. The recess 24 of the substrate holding member 20 is accommodated only in a direction in which the recess 24 abuts with the step 24 b so that the step of the distal end portion 12 and the step of the recess 24 are fitted.
[0017]
In the present embodiment, as shown in FIG. 3A, a projection 21 having a substantially regular triangular shape is formed on the surface 22 of the substrate holding member 20 as a mark indicating the above-described fitting direction. The equilateral triangle forming the convex portion 21 has a vertical bisector of the side 21a passing through the corner 21b in the semicircular region on the side where the second top surface 24b exists on the corresponding back surface. The surface 24b is disposed so as to coincide with a radial direction that bisects the surface 24b. Thereby, in mounting the printed circuit board 3, when the board holding member 20 is mounted on the opening 5, the protrusion 21 is positioned so as to be near the center of the second end face 12 b of the boss 10. By doing so, the tip 12 of the boss 10 and the recess 24 of the substrate holding member 20 can be easily fitted.
[0018]
FIG. 4A is a side view of the vicinity of the boss 10 after the mounting of the printed circuit board 3 on the base 2, and FIG. 4B is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 4B, the substrate holding member 20 has the front end portion 12 of the boss portion 10 abutting the first end surface 12 a with the first top surface 24 a of the concave portion 24, and the second end surface 12b is fitted with the second top surface 24b of the recess 24 and is housed in such a manner that the step of the tip 12 and the step of the recess 24 fit together. Is locked by the fitting of the step, and the co-rotation of the substrate holding member 20 when the screw 4 is inserted is prevented.
[0019]
In this embodiment, the height d1 of the rib 11 is such that the heights d3 and d4 of the boss 10 protruding from the opening 5 when the printed circuit board 3 is placed on the rib 11 are the height d1 of the board holding member 20. The recesses 24 are set to have substantially the same depth as the depth to the first top surface and the depth to the second top surface, respectively.
[0020]
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments described herein, but includes various changes and modifications, and includes the appended claims or their claims. It includes those that do not depart from the technical idea. For example, in the above-described embodiment, the bottom of the board holding member 20 is in contact with the printed board 3 in the state after the printed board 3 is mounted as shown in FIG. When a considerable play is allowed for the holding, the protrusion heights d3 and d4 of the boss portion 10 are set to the depths of the recess 24 of the substrate holding member 20 to the first top surface, respectively, and the second top The printed circuit board 3 may be held slightly higher than the depth to the surface, with a gap provided between the printed circuit board 3 and the board holding member. According to this mounting structure, since the stress due to the tightening of the screw 4 is not applied to the printed circuit board 3 at all, it is suitable as the printed circuit board mounting structure according to the present invention.
[0021]
Further, the structures of the boss portion and the bottom portion of the board holding member in the printed circuit board mounting structure according to the present invention are not limited to the semicircular male and female steps in the present embodiment. The shape of the end surface of the boss portion forming the step and the shape of the bottom portion of the board holding member facing the boss portion through the opening of the printed board are arbitrary as long as rotation around the screw axis is locked by fitting. It can be. Further, the printed circuit board mounting structure according to the present invention includes one using a boss portion of a polygonal column and a substrate holding member provided with a concave portion having a polygonal opening to be fitted therein. In this case, the end surface of the boss portion and the corresponding concave portion of the substrate holding member may not have the step as in the above-described embodiment.
[0022]
Further, in the printed circuit board mounting structure according to the present invention, the mark indicating the fitting direction of the board holding member is not limited to the triangular protrusion in the above-described embodiment, but may have any shape, structure, color, or the like. May be used.
[0023]
【The invention's effect】
As described above, according to the present invention, in a printed circuit board mounting structure for mounting a printed circuit board to a base together with a substrate holding member by screws, the co-rotation of the substrate holding member by screw insertion can be locked. Therefore, the efficiency of the mounting operation is improved, and the printed circuit board can be mounted on the base without damaging the wiring patterns disposed below and near the substrate holding member.
[0024]
In particular, according to the second aspect of the present invention, the change from the conventional printed circuit board mounting structure can be minimized, and the printed circuit board mounting structure according to the present invention can be realized with a simple structure.
[0025]
Furthermore, according to the third aspect of the present invention, even when the board holding member has no visible directionality due to the outer shape or the like, the fitting direction with the boss portion on the base can be easily visually recognized, so that the efficiency of the mounting operation is improved. Can be further improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a side decoration member of a pachinko machine, showing one embodiment of a printed circuit board mounting structure according to the present invention.
FIG. 2 is a perspective view showing one embodiment of a boss portion on a base according to the present invention.
FIG. 3 is a perspective view showing one embodiment of a substrate holding member according to the present invention.
FIG. 4A is a side view showing an embodiment of a printed circuit board mounting structure according to the present invention, and FIG. 4B is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a side view showing a conventional technique in a printed circuit board mounting structure.
FIG. 6 is a perspective view showing a conventional technique for preventing co-rotation caused by screwing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side decoration member 2 Base 3 Printed board 4 Screw 5 Opening 10 Boss part 11 Rib 12 Tip part 12a First end face 12b Second end face 13 Screw hole 20 Board holding member 21 Convex part 22 Surface 23 Screw hole 24 Concave part 24a First First top surface 24b Second top surface 25 Back surface

Claims (3)

A printed circuit board provided with an opening at a portion facing the boss portion is placed on the base on which the boss portion is protruded,
Place the board holding member on the printed board,
In a printed circuit board mounting structure, a screw is inserted from the outside of the substrate holding member, and the printed circuit board is mounted on the base together with the substrate holding member.
When the screw is inserted, a portion of the bottom of the substrate holding member that faces the tip of the boss through an opening in the printed circuit board so that the co-rotation of the substrate holding member is locked, A printed circuit board mounting structure, which is configured to be fitted with a tip of the boss portion. The tip of the boss portion includes a first end surface and a second end surface formed one step lower than the first end surface,
The first end face and the second end face project from an opening of the printed circuit board,
A portion of the bottom of the substrate holding member that fits into the tip of the boss portion is a concave portion that accommodates the protruding portion, and a first top surface having substantially the same shape as the first end surface. A second top surface which is formed to be shallower than the first top surface with a step having substantially the same size as a step between the first end surface and the second end surface, and having substantially the same shape as the second end surface. The printed circuit board mounting structure according to claim 1, further comprising: The printed circuit board mounting structure according to claim 1, wherein the substrate holding member includes a mark on a surface of the substrate holding member, the mark indicating a direction in which the front end of the boss can be fitted.

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