JPH073159U - Reinforced structure of printed circuit board - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a reinforcing structure for a printed circuit board, and an object thereof is to utilize the surface of the printed circuit board over the entire surface as an effective wiring region. A printed circuit board (2) is provided with a notch (1) at a pair of opposite edges, and a rising wall (3) is provided at the edge corresponding to the edge where the notch (1) is formed, and is adjacent to the rising wall (3). Reinforcement plate 5 with fixing piece 4 raised at the edge
And a hook 6a which is provided with the notch 1 in the rising wall 3 and projects to the opposite surface of the printed circuit board 2.
The reinforcing plate 5 is configured such that the fixing piece 4 is fixed to the printed circuit board 2 and both side edges of the printed circuit board 2 are locked and fixed by the locking hooks 6a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reinforcing structure for a printed circuit board.

[0002]

[Prior art]

 A printed circuit board used as a mother board or the like is reinforced by using a reinforcing plate in order to prevent harmful deformation such as warpage due to a vertical load applied to the mounting surface when the daughter board is inserted or removed.

As a reinforcing structure for such a printed circuit board, conventionally, a structure shown in FIG. 4 has been proposed. That is, in this conventional example, the reinforcing plate 5 is formed in a U-shaped cross section by bending a pair of opposing edges of the flat plate-shaped main body portion 5a.

A fixing tongue piece 8 is bent and formed on the bent rising wall 7 of the reinforcing plate 5, and the reinforcing plate 5 is fixed to the printed board by screwing the fixing tongue piece 8. It is fixed at 2.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, there is a risk of short-circuiting due to the head portion 16a of the screw 16 if the pattern is passed through the area for screwing, and as shown in FIG. It is necessary to set the area as the pattern prohibited area 9.

As a result, the surface of the printed circuit board 2 cannot be effectively used as a pattern formation area, and in particular, as shown in FIG. However, if the setting is made, it is necessary to narrow down the pattern in the area, and there is a drawback that unnecessary wiring is unavoidable.

The present invention has been made to solve the above drawbacks, and provides a strengthened structure of a printed circuit board that can be used as an effective wiring area over the entire surface of the printed circuit board. The purpose is to

[0008]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide a printed circuit board 2 having a notch 1 at a pair of opposing edges and a side corresponding to the edge at which the notch 1 is formed, as shown in FIG. 1 corresponding to an embodiment. The rising wall 3 is provided at the edge, and the reinforcing plate 5 having the fixing piece 4 raised at one edge adjacent to the rising wall 3, and the notch 1 is inserted into the rising wall 3 for printing. A locking hook 6a protruding from the opposite surface of the board 2 is provided. The reinforcing plate 5 has the fixing piece 4 fixed to the printed board 2 and the locking hooks 6a lock both side edges of the printed board 2. This is achieved by providing a reinforcing structure for the printed circuit board 2, which is then fixed.

[0009]

[Action]

 In the printed circuit board reinforcement structure according to the present invention, the notch 1 of the printed circuit board 2 is locked by the locking hook 6a of the reinforcing plate 5, and the printed circuit board 2 is fixed to the rising wall 3 of the reinforcing plate 5. Fasten with piece 4.

With the above configuration, the printed circuit board 2 is supported by the reinforcing plate 5 at the front surface portion and the side edge portions, and harmful deformation due to warpage or the like is prevented. Further, it is possible to reduce the number of screws that are fixed to the printed circuit board 2, and it is possible to reduce the pattern prohibited area of the printed circuit board 2 as much as possible.

According to the second aspect of the invention, the lower hook 6b is provided on the hook 6a of the reinforcing plate 5, and the hook 6a cooperates with the hook 6a to print the printed circuit board. By sandwiching 2, the harmful deformation such as warpage of the printed circuit board is further prevented. Prevents downward deflection.

[0012]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention. In this embodiment, the printed circuit board 2 is reinforced by fixing the reinforcing plate 5 to the back surface of the printed circuit board 2.

Circuit elements connected to each other by a circuit pattern are mounted on the printed circuit board 2 (not shown), and a plurality of connectors 11 for connecting the daughter boards 10, 10 ... 11 ... Is implemented.

Further, cutouts 1 for locking locking hooks 6a of a reinforcing plate 5 to be described later are provided on opposing edges of the printed circuit board 2, and further, on the edges where the cutouts 1 are provided. A screw insertion hole 12 is provided on the orthogonal edge.

The reinforcing plate 5 is a sheet metal member in which two rising edges 3 are formed by bending two sides facing the side edges of the printed circuit board 2 on which the cutouts 1 are provided. Further, the locking hook 6a is formed by extending further rearward.

Further, a fixing piece 4 having an L-shaped cross section is erected at one edge portion adjacent to the rising wall 3, and the fixing piece 4 has a burring if necessary depending on the plate thickness. After the machining, the screw hole 13 is provided.

A reinforcing wall 14 is bent at the center of the side where the fixing piece 4 is provided in order to prevent the bending of the reinforcing plate 5. A support piece 15 is cut and raised at the center of the reinforcing plate 5. The height of the support piece 15 is small between the back surface of the printed circuit board 2 in order to prevent excessive bending when mounting the daughter board 10 and to prevent a short circuit with the pattern of the printed circuit board 2 during operation. It is set so that a large gap is formed.

Next, a procedure for fixing the reinforcing plate 5 to the printed board 2 will be described with reference to FIG. First, after inserting the locking hooks 6a of the reinforcing plate 5 into the cutouts 1 of the printed circuit board 2 from below, they are moved backward to lock the locking hooks 6a to the peripheral edges of the cutouts 1 of the printed circuit board 2. Then, the reinforcing plate 5 is fixed to the printed board 2 by penetrating the screw insertion hole 12 and screwing a screw 16 into the screw hole 13.

As for the printed circuit board 2 to which the reinforcing plate 5 is fixed, as shown in FIG. 2B, the fixing piece 4 is fitted into the groove 18 of the fixing plate 17 on the housing 19 side, and mounted on the housing 19. Be touched.

In this state, when the daughter board 10 is plugged in to the connector 11, the printed circuit board 2 is supported by the fixing piece 4 of the reinforcing plate 5 at the lower side of one front side edge, and at the same time, two side edges that are orthogonal to each other are It is pressed by the locking hook 6a from above, and is prevented from bending upward.

Furthermore, when an excessive insertion force is applied when the daughter board 10 is plugged in, the support piece 15 of the reinforcing plate 5 contacts the back surface of the printed circuit board 2 to prevent excessive bending (FIG. 2 (a)).

Another embodiment of the present invention is shown in FIG. In the description of the present embodiment, the same configurations as those of the above-described embodiment will be designated by the same reference numerals in the drawings, and the description thereof will be omitted. In this embodiment, below the locking hook 6a, a lower locking hook 6b is provided between the locking hook 6a and the locking hook 6a with a distance substantially equal to the plate thickness of the printed circuit board 2.

Therefore, in this embodiment, the side edges of the printed circuit board 2 are sandwiched by the locking hooks 6a and the lower locking hooks 6b from above and below, so that the printed circuit board 2 does not move upward or downward. Therefore, the bending of the printed circuit board 2 when the daughter board 10 is plugged in is reliably prevented.

[0024]

[Effect of device]

 As is clear from the above description, according to the present invention, the notches on the opposite edges of the printed circuit board are locked by the locking hooks, and the fixing piece is raised on the one edge adjacent to the rising wall. Since the printed circuit board is fastened to the printed circuit board and the rising wall facing the edge of the printed circuit board is provided, the number of screws that fasten the printed circuit board can be reduced, and the pattern prohibited area of the printed circuit board can be minimized. Can be reduced to

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram showing details of FIG. 1, in which (a) is a side view,
(B) is a perspective view showing a state in which the printed circuit board 2 is fixed to the housing.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a view showing a conventional example, (a) is an exploded perspective view,
(B) is an enlarged view of part B of (a).

[Explanation of symbols]

 1 Notch 2 Printed circuit board 3 Standing wall 4 Fixing piece 5 Reinforcing plate 6a Locking hook 6b Lower locking hook

Claims (2)

[Scope of utility model registration request] 1. A printed circuit board (2) having a notch (1) at a pair of opposite edges, and a rising wall (3) at the edge corresponding to the edge where the notch (1) is formed. A reinforcing plate (5) having a fixing piece (4) raised on one edge adjacent to the rising wall (3), and the notch (1) is inserted into the rising wall (3). ,
Locking hook (6) protruding to the opposite surface of the printed circuit board (2)
a) is provided, the fixing plate (5) of the reinforcing plate (5) is fixed to the printed circuit board (2), and both side edges of the printed circuit board (2) are locked by the locking hooks (6a). Reinforced structure of the printed circuit board that is then fixed. 2. The lower wall (3) is provided with a lower hook (6b) which cooperates with the hook (6a) to sandwich the front and back surfaces of the printed circuit board (2). Printed circuit board reinforcement structure.