JPH0735344Y2 - Ground terminal screw mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a mounting structure of a screw for a ground terminal which is provided on an outer surface of a housing as a screw for tightening and fixing the ground terminal.

2. Description of the Related Art Conventionally, as shown in FIG. 3, when a screw 1 for a ground terminal is mounted on the outer surface of a housing 2, the shaft end side of the screw 1 is mounted on the housing 2.
Since it is located so as to project toward the circuit board housed inside, the insulating plate is erected and fixed on the plate surface of the circuit board facing the shaft end side of the screw 1 or the case surface is recessed inward. An insulating case provided with an escape portion for receiving the shaft end side of the screw 1 is attached.

However, in this case, in addition to the specified electronic components, another insulating plate or insulating case must be mounted on the board surface of the circuit board, which restricts the component mounting surface of the circuit board and requires time and effort to assemble the circuit board. become. Also, when the insulating plate is installed upright on the surface of the circuit board, and when the specified screw is removed during use of the main unit in a general home, etc., replace this screw with another relative screw. If a long screw is used, the insulating plate may be pushed down on the plate surface of the circuit board to cause troubles such as pressing various electronic components mounted on the plate surface. On the other hand, when making the relief part by denting the case surface of the insulating case inward, it is necessary to provide a notch for receiving the relief part also on the circuit board side. It is not preferable because it will be restricted.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention solves all of the above-mentioned drawbacks, and an object of the present invention is to provide a ground terminal screw mounting structure capable of reliably obtaining the insulation distance between the circuit board and the shaft end side of the screw in a narrow space. And

Means for Solving the Problems In the structure for mounting the screw for the ground terminal according to the present invention, the circuit board is provided on the inner surface of the housing in correspondence with the screw receiving hole of the housing into which the screw for the ground terminal is inserted. A partition wall having opposing partition walls is integrally formed with the housing within the space between the circuit board and an insulating resin, and the shaft end side of the ground terminal screw screwed from the outside of the housing is the partition wall of the partition wall from the circuit board. It is configured by separating the parts.

In this earth terminal screw mounting structure, the partition wall is formed into a pocket shape with a bottom, and the shield plate is inserted between the partition wall of the partition wall and the inner surface of the housing, and It can be configured such that it is fastened and fixed to the housing together with the screw.

With the mounting structure of the screw for the ground terminal, not only can the circuit board on which the electronic component is mounted and the shaft end side of the screw be reliably separated by the partition wall of the partition wall, but the partition wall is integrated with the inner surface side of the housing. Since it is made of insulating resin, there is no need to separately install a means to insulate and separate from the shaft end side of the screw, the partition wall does not collapse even if a long screw is inserted, and the length of the screw is the partition wall of the partition wall. Can be regulated by department. Further, since the partition wall is provided so as to be located within the space between the circuit board,
Since it is not necessary to provide a cutout or the like on the circuit board, the screw for the ground terminal can be screwed and fixed in a narrow space.

If the partition wall is formed in the shape of a bottomed pocket, even if a foreign matter such as a pin is inserted from the screw insertion hole, it can be prevented from entering the circuit assembly. Further, since the shield plate is fastened and fixed to the housing together with the ground terminal screw between the partition wall of the partition wall and the inner surface of the housing, the screws and the like necessary for fixing the shield plate are reduced. be able to.

Example The following is a description with reference to FIGS. 1 and 2.

As shown in FIG. 1, the screw mounting structure is such that the screw 1 for the ground terminal is inserted from the outer surface of the housing 2 into the housing 2 that houses the circuit board 3 on which various electronic components E are mounted. It is applied to fix with screws. A screw receiving hole 4 is provided on the plate surface of the housing 2, and a partition wall 5 is provided on the inner surface.
Is provided. The partition wall 5 has a partition wall portion 5a facing the circuit board 3, and is formed integrally with the housing 2 using an insulating synthetic resin. The partition wall portion 5a is formed at a distance h from the inner surface of the housing 2, and the distance h is greater than the protruding length 1 of the ground terminal screw 1 inserted into the housing 2 from the screw receiving hole 4. It is enough to set a little larger. Also,
The partition wall 5 is provided so that the partition wall portion 5a faces the circuit board 3 within a distance w from the circuit board 3.

In the mounting structure of the screw for the ground terminal configured in this way,
The partition wall 5a of the partition wall 5 is positioned relative to the circuit board 3 within the distance w from the circuit board 3 and insulates and separates from the screw 1 for the ground terminal screwed inward from the outer surface of the housing 2. Does not impose any restrictions on. In addition, the partition wall 5a of the partition wall 5 regulates the insertable size of the ground terminal screw 1, and even if a relatively long screw is inserted, it may be pushed down to the circuit board 3 side at the shaft end side. Absent.

The partition wall 5 described above can be formed in a substantially U-shape having left and right side wall portions 5b and 5c. The partition wall 5 is a partition wall
5a and side wall portions 5b and 5c may be formed in a bottomed pocket shape as shown in FIG. In this case, even if a foreign matter such as a pin is inserted into the housing 2 through the screw receiving hole 4, the foreign matter such as a pin can be received inside the partition wall 5 so as not to be turned into the accommodation side of the circuit board 3. Also,
With this ground terminal screw 1, the shield plate 6 assembled inside the housing 2 can be used together. If the shield plate 6 is partially inserted between the partition wall portion 5a of the partition wall 5 and the inner side surface of the housing 2, the ground terminal screw 1
The shield plate 6 can be fastened and fixed to the housing 2 by screwing the shield plate 6 into the screw fixing hole 7 which is located opposite to the screw receiving hole 4. In this case, the side walls 5b, 5c of the partition wall 5 are partially cut out linearly (see the solid line in FIG. 2) or obliquely (see the broken line in FIG. 2) from the upper end side to form slits 8, 9
By providing the above, the shield plate 6 can be partially inserted between the partition wall portion 5a of the partition wall 5 and the inner side surface of the housing 2.

Effect of the Invention As described above, according to the structure for mounting the screw for the ground terminal according to the present invention, the partition wall can prevent the shaft end side of the screw for the ground terminal from coming into contact with the circuit board, so that mutual insulation separation can be ensured. In addition, since the partition wall is formed within the distance from the circuit board, it is not necessary to provide the circuit board with a cutout or the like for receiving the partition wall. By forming the partition wall in the shape of a bottomed pocket, even if a foreign matter is inserted from the screw receiving hole, it can be prevented from entering the accommodation side of the circuit assembly. Further, since the shield plate is inserted between the partition wall of the partition wall and the inner side surface of the housing, it is possible to fasten and fix it together with the screw for the ground terminal.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mounting structure of a ground terminal screw according to the present invention, FIG. 2 is an explanatory view showing an example of a partition wall in the mounting structure, and FIG. 3 is a ground terminal screw according to a general example. It is explanatory drawing of the housing for electric equipment with which it was equipped. 1: Screw for ground terminal, 2: Case, 3: Circuit board, 4: Screw receiving hole, 5: Partition wall, 5a: Partition wall of partition wall, 6: Shield plate.

Claims (3)

[Scope of utility model registration request] 1. A circuit board (3) on which an electronic component (E) is mounted is housed in a housing (2) formed of an insulating resin, and a ground terminal screw (1) is provided in the housing (2). In the mounting structure of the screw for the ground terminal which is inserted into the inside from the outside and fixed by screwing to the case (2), the screw receiving hole (4) of the case (2) into which the screw (1) for the ground terminal is inserted is provided. Correspondingly, a partition wall (5) having a partition wall (5a) facing the circuit board (3) is provided on the inner surface of the housing (2) within the space between the circuit board (3) and the partition wall (5). ) Is integrally formed of insulating resin, and the shaft end side of the ground terminal screw (1) screwed from the outside of the housing (2) is separated from the circuit board (3) to the partition wall (5a) of the partition wall (5). The ground terminal screw mounting structure is characterized by being separated from each other. 2. The structure for mounting a ground terminal screw according to claim 1, wherein the partition wall (5) is formed in a bottomed pocket shape. 3. A shield plate (6) is inserted between the partition wall (5a) of the partition wall (5) and the inner surface of the housing (2), and
3. The earth terminal screw mounting structure according to claim 1, wherein the earth terminal screw (1) is fastened and fixed together with the housing (2).