JPH04125997A - Earth device - Google Patents

Abstract

PURPOSE:To stably secure earth connection for a long period by providing the connecting piece of an earthing member to the notched section of a wiring board in a faced state and electrically and mechanically connecting a conductor electrically connected with an earth land provided across the notched section to the connecting piece. CONSTITUTION:A rectangular notched-section 11 is formed at the inner edge section of a wiring board 2 and a conductor 12 is bridged across the notched section 11. An L-shaped connecting piece 16 is erected from an earthing member 3 by cutting and bending. Then a screw 22 on which a spring 21 is put is passed through the through hole 19 of the connecting piece 16 and through hole 13 of the conductor 12 and a washer 23 and nut 24 are put on the leading end of the screw 22 protruding upward from the conductor 12. When the screw 22 is tightened with the nut 24, the conductor 12 and connecting piece 16 can be connected with each other in a press-contacted state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a grounding device for grounding a grounding land of a wiring board to a grounding member.

(Prior art) For example, in an inverter ballast for lighting a fluorescent lamp, the fifth
As shown in the figure, a wiring board 2 on which electrical components 1 of an inverter circuit are mounted is housed in a metal case 3, and a ground land of the wiring board 2 is connected to the case 3 for grounding.

The grounding structure consists of a connecting piece 4 cut out from the case 3.
Place the ground land on the lower surface of the wiring board 2 and tighten the screw 5 from the top surface of the wiring board 2 to the connecting piece 4 to press the ground land of the wiring board 2 and the connecting piece 4 to make the earth connection. I was letting it happen.

(Problem to be Solved by the Invention) By the way, when the wiring board 2 is made of phenol resin, a phenomenon occurs in which the resin thins due to aging.
The thickness of the wiring board 2 changes to become thinner.

Therefore, in the conventional grounding structure as described above, when the thickness of the wiring board 2 becomes thinner due to aging, the pressure contact force between the earthing land of the wiring board 2 and the connecting piece 4 decreases, and connection failures tend to occur. The ground connection was not secure.

The present invention has been made in view of the above points, and an object of the present invention is to provide a grounding device that can ensure stable ground connection even if the thickness of a wiring board changes over time. It is.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a grounding device that connects the ground land of a wiring board to a ground member, in which a notch is provided in the wiring board, and conduction is established between the ground land and the ground land across the notch. Further, the ground member is provided with a connecting piece facing the notch and electrically and mechanically connected to the conductor.

(Function) In the present invention, the connection piece of the grounding member is placed opposite to the notch of the wiring board, and this connection piece is electrically and mechanically connected to a conductor that is conductive to the earth land provided across the notch. .

(Embodiment) Hereinafter, the configuration of an embodiment of the grounding device of the present invention will be described with reference to FIGS. 1 and 2.

The grounding device of this embodiment is applied to, for example, the inverter ballast shown in FIG. 5, and the same reference numerals are used for the same structural parts as shown in FIG. 5, and the explanation thereof will be omitted.

The wiring board 2 has, for example, printed wiring formed on its lower surface, and lead wires of electrical components of an inverter circuit mounted on its upper surface penetrate through the lower surface and are connected to the wiring surface by soldering. A rectangular notch 11 is provided at the inner edge of the wiring board 2, and a conductor 12 is installed across the notch 11. This conductor 12 includes a connecting plate portion 14 having a through hole 13 in the center, and a connecting plate portion 14 having a through hole 13 in the center.
The leg portion 15 is bent from both ends into a substantially L-shape, and the leg portion 15 penetrates from the edge of the cutout portion 11 to the lower surface of the wiring board 2 and is connected to the earth land by soldering.

The case 3 accommodates the wiring board 2 as shown in FIG. 5, and is configured as a grounding member that connects the ground land of the wiring board 2 to provide grounding. A substantially L-shaped connecting piece 16 is cut and raised on the bottom surface of the case 3, and this connecting piece 16 is connected to an upright plate part 17 and a connecting plate part 18 that can be fitted into the cutout part 11. A through hole 19 is provided in the connecting plate portion 18.

Next, the operation of this embodiment will be explained.

When housing and fixing the wiring board 2 in the case 3, the wiring board 2
The connecting piece 16 of the case 3 is fitted into the notch 11 of the case 3, and the conductor 12 is joined onto the connecting piece 16.

Then, the screw 22 fitted with the spring 21 is passed through the through hole 19 of the connection piece 16 and the through hole 13 of the conductor 12 from below the case 3, and the washer 23 is fitted to the tip of the screw protruding upward from the conductor 12. screw the nut 24 together, and then tighten the screw 22.
By tightening the nut 24, the conductor 12 and the connecting piece 1 are
6 is pressure welded.

In this way, since the conductor 12 that conducts to the earth land of the wiring board 2 and the connection piece 16 of the case 3 are directly connected, the wiring board 2 is formed of phenol resin, and the resin tends to thin over time. Even if the thickness of the wiring board 2 changes, the ground connection can be stably ensured.

Incidentally, the conductor 12, as shown in FIGS. 3 and 4,
A pair of jumper wires may be used, and the notch 11 provided in the wiring board 2 may be provided at the end of the wiring board 2, as shown in FIG.

Further, the conductor 12 and the connecting piece 16 are not limited to the screws 22 and nuts 24, but can also be fixed by conventional means such as caulking.

〔Effect of the invention〕

According to the present invention, the connecting piece of the grounding member faces the notch of the wiring board, and the connecting piece is electrically and mechanically connected to a conductor that conducts to the earth land provided across the notch. Even if the thickness of the wiring board changes over time, a stable ground connection can be ensured.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the grounding device of the present invention;
FIG. 2 is a perspective view of a wiring board, FIGS. 3 and 4 are perspective views of a wiring board showing other embodiments of the present invention, and FIG.
The figure is a side view of an inverter ballast showing a conventional grounding structure. 2. Wiring board, 3. Case as grounding member, 11. Notch, 12. Conductor, 16. Connection piece. September 1, 1990 Inventor Toshiki Ito

Claims (1)

[Claims] (1) In a grounding device that connects the ground land of a wiring board to a ground member, a notch is provided in the wiring board, a conductor is provided that crosses this notch and is electrically connected to the ground land, and the ground member is provided with a conductor that connects the ground land to the ground member. A grounding device comprising a connecting piece facing the notch and electrically and mechanically connected to the conductor.