JPS5821189Y2 - Printed Kibanno Hojikouzo - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a method for fixing a printed circuit board by twisting a part of the mechanical chassis by forming a serrated holding part on the edge of the twisting piece of the mechanical chassis. The present invention relates to a printed circuit board holding structure that ensures reliable contact with the copper foil on the printed circuit board.

Conventionally, in order to incorporate a printed circuit board into a mechanical chassis, a method has been used in which the printed circuit board is screwed onto the mechanical chassis using screws.

However, in the case of using such a method, in addition to aligning the through holes drilled in the printed circuit board with the screw holes provided in the mechanical chassis, the screws inserted through these through holes and screw holes are used to It requires work to screw into the screw hole,
Improvement in workability was desired.

In particular, poor workability has been the biggest hurdle in this screw-in work, whether it is done manually by a human with a screwdriver or with an electric screwdriver.

On the other hand, as shown in Fig. 1, the leg 2 of the mechanical chassis 1 (this is also formed when providing the screw hole described above) is erected without using screws, and the iron leg 2 is printed. A projecting piece 7 formed by inserting a through hole 4 formed in the board 3, supporting the printed circuit board 3 with the shoulder part 5 of the mechanical chassis 1, and providing a groove 6 in the leg 2. By placing this protrusion 7 and the shoulder 5
In the meantime, devices for holding the printed circuit board 1 have been proposed.

However, this method merely holds the printed circuit board, and has the disadvantage that the holding gradually loosens.

In view of these points, the present invention provides the protruding piece with a serrated engaging part, and when the protruding piece having the engaging piece is twisted as described above, it bites into the copper foil pattern of the printed circuit board 3. By doing so thoroughly, it is possible to achieve the completeness of the above-mentioned retention and to simultaneously form an electrical circuit (usually a ground circuit is formed).

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 are a perspective view and a cross-sectional view of essential parts showing an embodiment of the present invention, and the same reference numerals as in FIG. 1 above indicate the same parts.

A shoulder portion 5 of a mechanical chassis 1 made of sheet metal that holds a printed circuit board 3 is provided with an upright leg portion 2, and this leg portion 2 is inserted into a through hole 4 provided in the printed circuit board 3. .

The inserted printed circuit board 3 is supported by the shoulder portion 5 of the mechanical chassis 1.

A projecting piece 7 is formed on the leg portion 2 by providing a cut groove 6.

On the lower end surface of this protruding piece 7, there is provided a substantially serrated engagement part 8, which is made up of a plurality of triangular, hook-shaped, etc. engagement pieces, and is attached to the mechanical chassis 1.
The ground wiring pattern 9 is provided so as to face parallel to the shoulder portion 5 of the printed circuit board 3, and its tip is extended so as to touch a part of the outer periphery of the through hole 4 provided in the printed circuit board 3. It is intricately formed.

That is, as shown in FIG. 3, the distance between the tip of the engaging portion 8 and the shoulder portion 5 of the mechanical chassis 1 is calculated by adding the thickness δ of the grounding wiring pattern 9 and the thickness l of the printed circuit board 3 itself. The thickness of the printed circuit board 3 is slightly smaller than the thickness l+δ of the printed circuit board 3.

Therefore, after inserting the legs 2 of the mechanical chassis 1 into the through holes 4 of the printed circuit board 3 as shown in FIG. The entire portion 8 presses the grounding wiring pattern 9 on the printed circuit board 3 from above, and the printed circuit board 3 is securely held between the protruding piece 7 and the shoulder portion 5 of the mechanical chassis 1.

Furthermore, since the engaging portion 8 of the projecting piece 7 is parallel to the shoulder portion 5, the entire engaging portion 8 consisting of a plurality of engaging pieces is connected to the grounding wiring pattern 9.
Since the mechanical chassis 1 and the pattern 9 are in contact with each other, the mechanical chassis 1 and the pattern 9 are reliably electrically connected, and therefore a reliable grounding circuit can be formed.

On the other hand, if the protruding piece 7 does not have the engaging part 8, that is, if the printed circuit board 3 is received by a surface (on the contrary, it is impossible to receive the printed circuit board 3 by a completely flat surface,
Therefore, the force for holding the printed circuit board 3 is weak (although the point is not sharp, the holding force is inferior after all).

That is, the printed circuit board 3 is strongly held by the meshing portion 8, and the pattern 9 and the mechanical chassis 1 are electrically connected by contacting the pattern 9 made of copper foil on the printed circuit board 3. Therefore, it is possible to omit the conventional and time-consuming steps of using jumper wires, connecting with other printed circuit boards, and forming a ground circuit via the iron-based printed circuit board.

As described above, the present invention is a protrusion that stands up on a mechanical chassis that holds a printed circuit board, and when the printed circuit board is placed on the mechanical chassis and the protrusion is twisted,
The engaging portion formed on the protrusion engages with the pattern of the printed circuit board and holds the printed circuit board, making it extremely easy to electrically and mechanically connect the printed circuit board and the mechanical chassis. This can be achieved with a simple process and configuration.

[Brief explanation of drawings]

Fig. 1 is a perspective view of main parts showing a state in which a conventional printed circuit board and a mechanical chassis are connected; The figure is a left sectional view showing the state before twisting the protrusion, and FIG. 4 is a left sectional view showing the state after twisting the protrusion. 1...Mechanical chassis, 3...Printed circuit board, 7...Protrusion piece, 8...Matching part, 9
······pattern.

Claims (1)

[Scope of utility model registration request] Legs are provided that stand up on the shoulders of a mechanical chassis made of sheet metal that holds a printed circuit board, and the through holes provided in the printed circuit board are inserted into the legs, and the printed circuit board is supported by the shoulders of the mechanical chassis. In the printed circuit board holding structure, the printed circuit board is held between the protruding piece and the upper shoulder by twisting the protruding piece formed by providing a cut groove in the leg part. A grounding wiring pattern provided on the surface is extended so as to touch a part of the outer periphery of the through hole, and a part of the protruding piece is provided with approximately serrated teeth from a plurality of engaging pieces facing parallel to the shoulder part. A shaped interlocking part is provided,
A holding structure for a printed circuit board, characterized in that the holding structure is such that the distance between the tip of the engaging portion and the shoulder portion is slightly narrower than the thickness of the printed circuit board.