JP2585121Y2 - Printed circuit board fixing structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board fixing structure in which a printed circuit board is housed and fixed in a case.

[0002]

2. Description of the Related Art A conventional printed circuit board fixing structure is shown in FIG.
This will be described with reference to FIG. In FIG. 11, 6
Reference numeral 0 denotes a case, which includes a case main body 61 and a lid 62. An insulating sheet 63 is laid inside the case body 61, and a printed board 65 on which the electronic components 64 are mounted is
It is fixed and stored at 6. Furthermore, the case body 6
A rubber waterproof seal 67 is interposed between the cover 1 and the lid 62.

[0005] Next, the operation of storing the printed circuit board 65 will be described. First, as shown in FIG.
An insulating sheet 63 is laid in the inside 1. Next, as shown in FIG. 13, the printed board 65 is fixed to the case main body 61 with screws 66. Then, as shown in FIG.
7 and the cover 62 is screwed to the case body 61.

[0004]

However, according to the conventional printed board fixing structure, when the printed board 65 is screwed to the case body 61, the number of screws 66 and the fastening position are limited by the circuit of the printed board 65. Sometimes. Therefore, the resonance frequency of the printed board 65 cannot be increased to a certain degree or more, and excessive stress due to the resonance of the printed board 65 is applied to the terminals and the soldered portions of the electronic components 64 mounted on the surface of the printed board 65. There is a problem that it acts and causes fatigue and breakage.

In addition, a screw 66 for fixing the printed circuit board 65, an insulating sheet 63, and a waterproof seal 67 are required, so that the number of parts is large, and there is a problem that it takes time to assemble. The purpose of this invention is to prevent the adverse effects on the mounted components due to the resonance of the board, reduce the number of components , and
An object of the present invention is to provide a printed circuit board fixing structure excellent in waterproofness .

[0006]

The printed circuit board fixing structure of the present invention comprises a case in which an opening of a case body is covered with a lid, and a case body in which an outer peripheral edge is clamped and fixed between the case body and the lid. A holding member having a waterproof, elastic, and insulating property provided along the inner surface and having a substrate insertion groove formed on the inner surface, and a printed circuit board having an outer peripheral edge inserted into the substrate insertion groove and housed in a case. Things.

[0007]

According to the structure of the present invention, since the outer peripheral edge of the printed circuit board is held by the holding member provided in the case, the resonance frequency of the printed circuit board can be increased as compared with the conventional screwing, and the resonance of the printed circuit board can be improved. This can prevent adverse effects on mounted components. A waterproof, elastic, and insulating holding member provided along the inner surface of the case body serves as an insulating sheet and is sandwiched between the case body and the lid.
It is pressure-fixed and also acts as a seal with excellent waterproof properties.It also has a function for fixing the printed board by inserting the printed board into the board insertion groove formed on the inner surface, and uses a holding member. Thus, the number of parts can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 to 4 show a first embodiment of the present invention. In the figure, reference numeral 10 denotes a case for housing a printed circuit board, which comprises a box-shaped case main body 11 having an open upper surface, and a lid 12 covering an opening of the case main body 11.
A holding member 13 extends along the inner surface of the case body 11. The holding member 13 is made of rubber having waterproofness, elasticity, and insulation, but may be formed of another resin or the like. Reference numeral 14 denotes a printed board on which various electronic components 15 are mounted.

Next, a more detailed description will be given according to the assembly operation procedure. First, as shown in FIG. 2, the printed board 14 is fixed to the holding member 13. A substrate insertion groove 16 extending horizontally is formed on the inner surface of the holding member 13,
The outer peripheral edge of the printed board 14 is inserted into the board insertion groove 16 and fixed. Note that the substrate insertion groove 16 is
Is provided on all four sides of the printed circuit board 1
4 may be held, but any structure that holds at least two or more edges of the printed circuit board 14 may be used. Further, at the upper end of the holding member 13,
A flange portion 17 bent outward is formed over the entire circumference.

Next, as shown in FIG. 3, the holding member 13 is housed in the case body 11. Collar 17 of holding member 13
Are provided between the case body 11 and the lid 12, and are formed with ridges 18, 19 formed to face the case body 11 and the lid 12.
The flange portion 17 is clamped and fixed between the two. Then, as shown in FIG. 4, the case body 11 and the lid 12 are fixed with screws 20 such as Torx screws.
Are not shown.

According to the printed circuit board fixing structure constructed as described above, the printed circuit board 14 has an outer peripheral edge at the holding member 1.
3 is fixed by inserting it into the board insertion groove 16, for example, compared with a case where eight places of the printed circuit board 14 are fixed with screws.
It has been confirmed by vibration analysis that the resonance frequency becomes about twice or more. As described above, by increasing the resonance frequency, the printed circuit board 14 due to disturbance when installed in a vehicle or the like is obtained.
Resonance can be prevented. If the printed circuit board 14 does not resonate, it is easy to take measures against vibration of the electronic components 15 mounted on the surface of the printed circuit board 14 because it is not necessary to consider the influence from the printed circuit board 14. Further, if there is no resonance of the printed circuit board 14, the stress applied to the terminals at both ends of the electronic component in which the terminals are arranged in a line like a HIC (hybrid IC) becomes very small, and breakage such as terminal breakage and solder cracks may occur. Can be prevented.

A holding member 13 having waterproof, elastic and insulating properties is provided along the inner surface of the case body 11,
Since it serves as an insulating sheet between the printed circuit board 14 and the case 10 and is interposed between the case body 11 and the lid 12 and is pressed by the ridges 18 and 19, it is waterproof.
It also has a function as a seal having excellent performance , and further has a function for fixing the printed board by inserting the printed board 14 into the board insertion groove 16 formed on the inner surface. The number of parts can be reduced, and the assembly work can be greatly reduced.

[0013] As shown in FIG.
Need not be in contact with the entire circumference of the printed circuit board 14,
The vertical groove 21 may be appropriately provided depending on circumstances such as fitting work. The printed circuit board 14 is fixed by inserting the board insertion groove 1.
6 may be used together with screwing to the case body 11. Second Embodiment FIGS. 6 and 7 show a second embodiment of the present invention.

In this embodiment, a case main body 31 constituting a case 30 is made shallow, and a flange 34 of a holding member 33 and a substrate insertion groove 39 are formed at substantially the same height. Protrusions 35 and 36 for pressing the flange 34 are formed on the case body 31 and the lid 32.
Protrusions 37 and 38 are formed to press the side wall portion 3 from above and below.

The same effect as that of the first embodiment can be obtained in the printed circuit board fixing structure having the above-described structure.
Further, by making the case main body 31 shallow, the shape of the holding member 33 can be reduced, and cost can be reduced. Further, the holding member 33 is provided with the ridges 35, 3 of the case body 31.
7 and the ridges 36 and 38 of the lid 32 are pinched and fixed, so that waterproofness is improved. Also, ridges 37,
By holding the side wall of the holding member 33 at 38, the outer peripheral edge of the printed board 14 inserted into the board insertion groove 39 is also fixed by pressure, and the fixing of the printed board 14 is further strengthened. Further, as shown in FIG. 7, a screw 41 is inserted from the lower surface of the case main body 31 and fastened to the lid 32, and the case main body 3
1 and the lid 32 are fixed, and the head of the screw 41 is
Is housed in the concave portion 40 on the lower surface. Therefore, case 30
Is mounted on a vehicle or the like, the head of the screw 41 is
The risk that the user accidentally removes the screw 41 and touches the high voltage part is greatly reduced.

Third Embodiment FIG. 8 shows a third embodiment of the present invention. This example is
In the second embodiment, the board insertion groove 39 of the holding member 33 is used.
Is cut off at the upper part 45 of FIG. The same effect as in the second embodiment can be obtained in the printed circuit board fixing structure configured as described above. Further, the upper part 4 of the substrate insertion groove 39
5, the printed circuit board 14 is inserted into the board insertion groove 39.
It becomes easy to insert into. The board insertion groove 3 of the holding member 33
The same effect can be obtained by cutting the lower part of 9.

Fourth Embodiment FIG. 9 shows a fourth embodiment of the present invention. This example is
A substrate insertion groove 56 is formed in the holding member 53 at a position near the joint between the case body 51 and the lid 52 of the case 50, and the side wall of the holding member 53 is pressed by the ridges 54, 55. Fixed. The same effect as in the second embodiment can be obtained in the printed circuit board fixing structure configured as described above.

Fifth Embodiment FIG. 10 shows a fifth embodiment of the present invention. This embodiment is different from the fourth embodiment in that the upper and lower surfaces 57 and 58 of the side wall of the holding member 53 are inclined so that the outside has a small thickness. The same effect as in the fourth embodiment can be obtained in the printed circuit board fixing structure configured as described above. Further, when the case main body 51 and the lid 52 are screwed together, the printed circuit board 14 is more strongly pressed and fixed by the holding member 53. Therefore, even if the hardness of the holding member 53 is softened so that the printed board 14 can be easily inserted into the board insertion groove 56 of the holding member 53,
Can be firmly fixed.

[0019]

According to the structure of the present invention, since the outer peripheral edge of the printed circuit board is held by the holding member provided in the case, the resonance frequency of the printed circuit board can be increased as compared with the conventional screwing, and the printed circuit board can be increased. This can prevent adverse effects on mounted components due to the resonance. In addition, the holding member having waterproof, elastic, and insulating properties provided along the inner surface of the case main body plays a role of an insulating sheet, and is nipped and fixed between the case main body and the lid, and has excellent waterproofness. It also plays a role as a seal, and also has a function for fixing the printed board by inserting a printed board into the board insertion groove formed on the inner surface, and by using a holding member, the number of parts can be reduced, The effect that assembly can be easily performed is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of the first embodiment of the present invention in an assembled state.

FIG. 2 is a sectional view showing an assembling procedure of the first embodiment of the present invention.

FIG. 3 is a sectional view showing an assembling procedure of the first embodiment of the present invention.

FIG. 4 is a partial sectional view of the first embodiment of the present invention.

FIG. 5 is a sectional view of a modification of the first embodiment of the present invention.

FIG. 6 is a sectional view of the second embodiment of the present invention in an assembled state.

FIG. 7 is a partial sectional view of a second embodiment of the present invention.

FIG. 8 is a sectional view of the third embodiment of the present invention in an assembled state.

FIG. 9 is a sectional view of the fourth embodiment of the present invention in an assembled state.

FIG. 10 is a sectional view of a fifth embodiment of the present invention in an assembled state.

FIG. 11 is a sectional view of a conventional example in an assembled state.

FIG. 12 is a sectional view showing an assembling procedure of a conventional example.

FIG. 13 is a sectional view showing an assembling procedure of a conventional example.

FIG. 14 is a sectional view showing an assembling procedure of a conventional example.

[Explanation of symbols]

 10, 30, 50 case 11, 31, 51 case body 12, 32, 52 lid 13, 33, 53 holding member 14 printed board 16, 39, 56 board insertion groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A case in which an opening of a case main body is covered with a lid, and an outer peripheral edge is pressed between the case main body and the lid.
A waterproof / elastic / insulating holding member fixedly provided along the inner surface of the case main body and having a substrate insertion groove formed on the inner surface, and an outer peripheral edge inserted into the substrate insertion groove to be inserted into the case. A printed circuit board fixing structure including a stored printed circuit board.