JPS635276Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printed circuit board insulation structure for electrical equipment, and is capable of reliably insulating the conductive foil and electronic component terminals of the printed circuit board from the conductive case.

In many cases, printed circuit boards with printed wiring for various electronic components are housed in a case, but in this case, the case itself is generally molded from a conductive material in order to use it as a ground. Therefore, it is necessary to provide insulation between the copper foil of the printed circuit board or the electronic component terminals and the case. However, conventionally, as shown in FIGS. 1 and 2, a cut and raised piece 3 is provided on the bottom plate 2 of the case 1, and a printed circuit board 4 is placed on this cut and raised piece 3. The cut-and-raised pieces 7 provided on the side plates 5 and 6 are pressed against the cut-and-raised piece 3 to fix the electronic component 8 between the bottom plate 2 and the printed circuit board 4 by the cut-and-raised piece 3. Ensure the height of the solder 10 connected to the
The two were insulated. For this reason, especially if the printed circuit board 4 is long or the electronic component 8 is heavy, it is necessary to provide a large number of cut and bent pieces 3, which not only takes time and effort to manufacture, but also allows the printed circuit board 3 and the printed circuit board to be Insulation was also required between the substrate 4 and the insulation was insufficient. Furthermore, even if insulating paper is interposed in this part, the insulating paper is easily torn by the cut and raised pieces 3, so there is sufficient space between each cut and raised piece 3 and the copper foil 9 as shown in FIG. Therefore, the degree of freedom in design was reduced, and the arrangement of electronic components 8 was also hindered.

The present invention solves the above problems, and its feature is that a printed circuit board on which various electronic components are printed is placed inside a conductive case that has a bottom plate and a pair of side plates in a U-shape. In electrical equipment that is housed with the conductive foil side facing the bottom plate, an insulating sheet is provided on the bottom plate facing the printed circuit board, and the sheet is fixed to the bottom plate of the conductive case so that it cannot move in the longitudinal direction with respect to the bottom plate. A plurality of column-shaped insulating spacers are provided between the bottom plate and the printed circuit board to separate them from each other, and a plurality of vertically penetrating fitting holes are provided in the insulating sheet. , the lower part of the insulating spacer is fitted into each fitting hole so that the insulating spacer and the insulating sheet cannot move relative to each other, and the printed circuit board is pressed to the side plate of the conductive case to the bottom plate through the insulating spacer. The point is that we have established a section.

Hereinafter, the present invention will be explained according to the illustrated embodiment. In FIGS. 4 to 6, 11 is a conductive case made of a conductive metal plate, and a long and narrow rectangular bottom plate 12; A pair of side plates 13 and 14 projecting upward from both ends in the width direction are provided in a U-shape. Reference numeral 15 denotes locking portions formed by cutting and bending the bottom plate 12. A pair of locking portions 15 are provided at both ends of the bottom plate 12 in the longitudinal direction and spaced apart in the width direction. A fitting groove 1 protrudes upward in the shape of a shape, and is lowered in the shape of a step on the inner side in the longitudinal direction.
6 is formed. Reference numeral 17 denotes a cut-and-raised hole formed in the bottom plate 12 by cutting and raising the locking portion 15 . 1
Reference numeral 8 denotes a printed circuit board, which has a long and narrow rectangular shape whose length in the width direction is the same as that of the bottom plate 12.
The printed circuit board 18 is arranged parallel to the bottom plate 12 between the terminals 14, and both ends of the printed circuit board 18 in the longitudinal direction are fitted into the fitting grooves 16 of each locking section 15. On the top surface of the printed circuit board 18 are a transistor 19, resistors 20, 21, capacitors 22, 23, an electrolytic capacitor 24, and a transformer 2.
Various electronic components such as 5 and the like are arranged, and the electrolytic capacitor 24 and transformer 25 are considerably heavy. A large number of copper foils 26 are arranged on the lower surface of the printed circuit board 18 for printed wiring of each of the electronic components, and the terminals a of each electronic component are inserted vertically into the printed circuit board 18 and are connected to the copper foils 26 on the lower surface of the printed circuit board 18. solder 2
It is given a 7. 28 is an insulating sheet provided on the bottom plate 12, and is made of an insulating material such as insulating paper or plastic, and has a locking portion 1 whose length in the width direction spans the entire width of the bottom plate 12 and whose length in the longitudinal direction corresponds to the longitudinal direction.
It is formed in a rectangular shape spanning the entire length between 5 and 15, and has locking parts 1 corresponding to the width direction at both longitudinal ends.
It has a protruding piece 29 that fits between 5 and 15,
The insulating sheet 28 is locked so that it cannot move in the longitudinal direction by the locking part 15, and is regulated so that it cannot move in the width direction by the side plates 13, 14 and the locking part 15. At both ends of the insulating sheet 28 in the longitudinal direction, a circular fitting hole 30 is opened vertically and through the center in the width direction. Reference numeral 31 denotes a cylindrical insulating spacer made of an elastic insulating material such as rubber or plastic. A pair of insulating spacers 31 are provided spaced apart in the longitudinal direction between the bottom plate 12 and the printed circuit board 18, and each insulating spacer 31 has a locking portion. 15, and are fitted into the fitting holes 30, respectively, to separate the bottom plate 12 and the printed circuit board 18. Reference numeral 32 denotes pressing portions formed inwardly protruding from the side plates 13 and 14 by cutting and raising, and there are one pair corresponding to each insulating spacer 31. Each pressing portion 32 presses the printed circuit board 18 through the insulating spacer 31. The printed circuit board 18 is fixed to the case 11 by pressing against the bottom plate 12. 33 is the side plate 13 by cutting and raising the pressing part 32;
This is a square hole formed in 14.

According to the configuration of the above embodiment, the conductive case 11
In order to assemble the printed circuit board 18 into the
Insert the insulating sheet 28 on top and remove the protruding piece 29.
When the insulation sheet 28 is fitted between the locking portions 15 and 15 corresponding to the width direction, and the insulating spacer 31 is fitted into the fitting hole 30 and installed on the bottom plate 12, both longitudinal ends of the insulating sheet 28 are connected to the locking portions. 15 and the locking portion 15
The insulating spacer 31 is locked so that it cannot move in the longitudinal direction, and is restricted from moving in the width direction by the side plates 13 and 14 and the locking part 15.
0 is positioned with respect to the bottom plate 12. After that, the printed circuit board 18 is inserted from above and placed on the insulating spacer 31, and its longitudinal ends are fitted into the fitting groove 16. In this state, the printed circuit board 18 is pressed by the insulating spacer 31 by the pressing part 32.
At this time, the insulating spacer 31 is positioned and there is no risk of it moving in the longitudinal and width directions, so there is no need to hold the insulating spacer 31 fixed, and the printed circuit board 18 can be easily installed. After assembly, the printed circuit board 18 is restricted by the side plates 13 and 14 and the locking portion 15 so that it cannot move in the longitudinal and width directions, and there is no space between the lower surface of the printed circuit board 18 and the bottom plate 12 due to the interposition of the insulating spacer 31. A gap b exceeding the height of the solder 27 is formed over the entire area, and a gap b exceeding the height of the solder 27 is formed between the bottom plate 12, the copper foil 26, and each terminal a of the electronic component.
It is possible to reliably insulate the Moreover, even if the printed circuit board 18 is bent downward due to vibration or the weight of electronic components and the printed circuit board 18 approaches the bottom plate 12, the entire area corresponding to the printed circuit board 18 on the bottom plate 12 is Since the insulating sheet 28 is present throughout, insulation between the bottom plate 12, the copper foil 26, and the terminal a can be ensured.

FIG. 7 shows another embodiment, in which a through hole 34 is opened in the bottom plate 12 corresponding to the center of the fitting hole 30, and a through hole 34 is formed in the center of the lower surface of the insulating spacer 31.
A protrusion 35 corresponding to No. 4 is provided to protrude downward, and the protrusion 35
is removably fitted into the through hole 34.

FIG. 8 and FIG. 9 show further other embodiments,
The locking part 15 is not provided with a fitting groove 16 and has a rectangular plate shape parallel to the side plates 13 and 14, and the insulating sheet 28 is not provided with a protruding piece 29 and the sheet 28 is rectangular. , the printed circuit board 18 and the insulating sheet 28 are locked so as not to be movable in the longitudinal direction between the locking portions 15, 15 corresponding to each other in the longitudinal direction. In addition, the insulating spacer 31 is attached to the printed circuit board 1.
8 and the bottom plate 12, two spacers spaced apart in the width direction, and two spacers spaced apart in the longitudinal direction in the center. Four pressing portions 32 are provided, and six fitting holes 30 are provided in the insulating sheet 28.
Further, each spacer 31 and the bottom plate 12 are provided with a projection 35 and a through hole 34 as in the case of FIG.
The other points are the same as those of the previous embodiment, and the same effects are achieved.

In the above embodiment, the copper foil 26 is provided as a conductive foil on the lower surface of the printed circuit board 18.
Other conductive foils may be used in place of 6.

According to the present invention, a plurality of columnar insulating spacers are provided between the bottom plate and the printed circuit board so as to space them apart, so that the conductive case and the conductive foil of the printed circuit board and the electronic components Since the insulation sheet is provided on the bottom plate facing the printed circuit board, the insulation is even more perfect. Further, since the spacer is insulating, the conductive foil can be freely arranged over substantially the entire area of the printed circuit board while maintaining the above-mentioned insulating state, thereby reducing restrictions on the arrangement of electronic components. Furthermore, a vertically penetrating fitting hole is provided in the insulating sheet, and the lower part of the insulating spacer is fitted into this fitting hole so that the insulating spacer and the insulating sheet cannot be moved. The insulating spacer can be positioned when assembling the
Not only can the printed circuit board be easily assembled, but also the movement of the insulating spacer can be prevented even after assembly, and therefore it is possible to easily and reliably assemble the printed circuit board without using a pre-adhesive material or the like.

[Brief explanation of drawings]

Figure 1 is a side sectional view showing a conventional example, and Figure 2 is a side sectional view showing a conventional example.
3 is a sectional view taken along line BB in FIG. 1, FIG. 4 is a side sectional view showing an embodiment of the present invention, FIG. 5 is a front sectional view, Fig. 6 is a plan view of the same printed circuit board with it removed, Fig. 7 is a side sectional view showing another embodiment, Fig. 8 is a side sectional view showing yet another example, and Fig. 9 is a side sectional view of the same printed board. FIG. 3 is a plan view of the removed state. 11... Conductive case, 12... Bottom plate, 13,
14... Side plate, 15... Locking part, 18... Printed circuit board, 26... Copper foil, 28... Insulating sheet, 3
0... Fitting hole, 31... Insulating spacer, 32...
Pressing part.

Claims (1)

[Scope of utility model registration request] In electrical equipment, a printed circuit board on which various electronic components are printed is housed in a conductive case having a bottom plate and a pair of side plates in a U-shape, with the conductive foil side of the printed circuit board facing the bottom plate. An insulating sheet is provided on the bottom plate facing the conductive case, a locking part is provided on the bottom plate of the conductive case to lock the sheet against the bottom plate so that it cannot move in the longitudinal direction, and the two are separated between the bottom plate and the printed circuit board. A plurality of columnar insulating spacers are provided spaced apart from each other, and a plurality of vertically penetrating fitting holes are provided in the insulating sheet, and the lower part of the insulating spacer is inserted into each fitting hole between the insulating spacer and the insulating sheet. 1. A printed circuit board insulating structure, characterized in that the conductive case is fitted in a manner such that they cannot move relative to each other, and a pressing portion is provided on the side plate of the conductive case to press the printed circuit board against the bottom plate via an insulating spacer.