JP6078089B2 - Printed circuit board and printed circuit board connection structure using the circuit board - Google Patents

Description

  The present invention relates to a printed circuit board, and more particularly to a technique for suppressing distortion generated in a specific region when fixing the printed circuit board.

  Usually, the printed circuit board is fixed to a plurality of support posts (attachment support posts) provided in a housing or the like by screwing through the screw fastening holes of the printed circuit board.

  However, since the heights of the respective columns vary, when the printed circuit board is fixed to the columns by screwing, the stress due to the screwing causes distortion at the center of the printed circuit board.

  There exists patent document 1 as what reduces the distortion of the center part of the printed circuit board produced by the stress by screwing. As shown in FIG. 3, the slit 1b is provided on both sides of the screwing hole 1a of the printed circuit board 1 so as to reduce the distortion at the center of the printed circuit board.

Japanese Utility Model Publication No. 5-411169

  However, it still cannot be said to be sufficient for reducing the strain caused by the stress caused by screwing.

In recent years, printed boards are required to be mounted with high density, and electronic components to be mounted are also miniaturized.
For example, electronic components such as BGA (Ball Grid Array) packages and surface mount ceramic capacitors are particularly vulnerable to distortion, and electronic components and contacts soldered to the printed circuit board may be damaged by screwing the printed circuit board. was there.

  An object of the present invention is to solve these problems and reduce breakage due to strain caused by stress caused by screwing of a printed circuit board.

In order to achieve the object, a printed circuit board according to claim 1 of the present invention is a printed circuit board (10) having a plurality of screw holes (10a), and is formed in the vicinity of the outer edge thereof. In the printed circuit board, the slit (10b) is formed around the screw hole so as to surround the screw fastening hole, and the inner region surrounded by the slit is the screw fixing region (10c). its tip is formed extending to the vicinity of the outer edge of the printed circuit board substantially is the position surrounding the entire circumference of the screwing hole, before Symbol screw fixing area, the leading end of the slit and the outer edge of the printed circuit board It is characterized by being connected by only one connecting portion (10d) that is a region sandwiched between the two .

  The printed circuit board according to claim 2 of the present invention is the printed circuit board according to claim 1, wherein the length of the connecting portion in the direction from the outer edge of the printed circuit board to the inside is the same direction. It is characterized by being shorter than the length from the outer edge of the printed circuit board to the center position of the screwing hole.

  According to a third aspect of the present invention, in the printed circuit board according to the first or second aspect, the slit is formed in a straight line.

In the printed circuit board connection structure according to claim 4 of the present invention, two printed circuit boards (10, 20) arranged opposite to each other at a predetermined distance are stacked between a plurality of support columns (30) between the opposed surfaces. A printed circuit board connection structure supported by a connector (40a, 40b), wherein at least one of the two printed circuit boards is the printed circuit board according to any one of claims 1 to 3.
The stacking connector is characterized in that the stacking connector is disposed further inward than the slit located inwardly when viewed from the outer edge of the printed circuit board.

  It is possible to reduce breakage due to strain caused by stress caused by screwing of the printed circuit board.

The top view of the printed circuit board 10 concerning the 1st Embodiment of this invention The perspective view of the printed circuit board connection structure 100 concerning the 2nd Embodiment of this invention. The top view concerning the conventional printed circuit board 1

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

[First Embodiment]
This embodiment will be described with reference to FIG. FIG. 1 is a plan view of a printed circuit board 10 according to the first embodiment of the present invention.

  The printed board 10 has a plurality of screw holes 10a. The printed circuit board 10 is fixed by screwing to a plurality of mounting posts (not shown) provided in the housing or the like through the screwing holes 10a. Here, an area outside the screw-fastening hole 10a where no electronic components are mounted and used for fixing the printed circuit board 10 by screwing is referred to as a screw-fixing area 10c.

  A linear slit 10b is formed around each of the screw holes 10a opened near the outer edge of the printed board 10 so as to surround the screw holes 10a. Therefore, the outer side of the screwing hole 10a and the inner side surrounded by the slit 10b is a screw fixing region 10c. At this time, each screw fixing region 10c and the opposite region sandwiching the slit 10b are connected to each other at only one connecting portion 10d on the outer edge of the printed board 10.

  In this way, the connecting portion 10d that connects the screw fixing region 10c and the region on the opposite side with the slit 10b interposed therebetween is only one portion on the outermost edge farthest from the region where the electronic components and the like of the printed circuit board 10 are mounted. As a result, the stress when screwed to the mounting support through the screwing hole 10a is concentrated on the connecting portion 10d on the outer edge of the printed circuit board 10, and the electronic component of the printed circuit board 10 is mounted in the direction of the stress. Since it is a direction along the outer edge rather than a direction toward the inside which is an area, damage due to distortion can be reduced without being transmitted to the area where the electronic component or the like at the center of the printed circuit board 10 is mounted.

Moreover, the only one point of the farthest edge from the area where electronic components of the connecting portion 10d of the printed circuit board 10 connecting the opposite side of the region sandwiched between the screw fixing region 10 c and the slit 10b is mounted As a result, even when the height of the mounting posts varies, the stress when screwed through the screwing holes 10a is concentrated on the connecting portion 10d on the outer edge of the printed circuit board 10, and the direction of the stress is also the printed circuit board 10. This is a direction along the outer edge rather than an inward direction, which is an area where the electronic components, etc. are mounted. Therefore, damage due to distortion is reduced without being transmitted to the area where the electronic components, etc. at the center of the printed circuit board 10 are mounted. I can do it.

  In the present embodiment, the slit 10b has a linear shape for ease of processing by a router or the like, but the slit 10b is not limited to a linear shape and is arbitrary. For example, it may be curved. The slit 10b is not limited to a uniform width, and may have a shape in which a wide portion and a narrow portion are mixed.

  The length of the connecting portion 10d connecting the screw fixing region 10c and the printed circuit board 10 in the direction from the outer edge of the printed circuit board 10 to the inside is the center of the screw fastening hole 10a from the outer edge of the printed circuit board 10 in the same direction. If the length is set shorter than the length up to the position, the printed circuit board 10 is fixed by screwing to the mounting support through the screwing hole 10a, and the electronic component or the like at the center of the printed circuit board 10 is mounted while the stress due to the screwing is fixed. Damage due to strain can be further reduced regardless of the area to be transmitted.

[Second Embodiment]
The present embodiment will be described with reference to FIG. FIG. 2 is a perspective view of a printed circuit board connection structure 100 according to the second embodiment of the present invention.

  The two printed circuit boards 10 and 20 are supported by a plurality of support columns 30 and stacking connectors 40a and 40b between opposing surfaces. Here, the upper printed circuit board 10 has the same structure as that of the first embodiment, and a description thereof will be omitted.

  The printed circuit board 10 is screwed to the plurality of columns 30 with screws 50. Similarly, the printed circuit board 20 is screwed to the support column 30 from below.

  Further, the stacking connector 40a connected and fixed to the printed circuit board 10 by soldering, press-fit, or the like, and the stacking connector 40b connected and fixed to the printed circuit board 20, the two printed circuit boards 10 and 20 face each other. It is supported and electrically connected.

Here, the stacking connector 40a connected and fixed to the printed board 10 is further disposed inward from the slit 10 b which is located most inward when viewed from the outer edge of the printed circuit board 10.

  Even when the height of the plurality of support columns 30 varies due to the structure of connecting the two printed circuit boards 10 and 20 as described above, when the screws are screwed through the screw holes 10a as in the first embodiment. Is not transmitted to the region where the electronic component or the like at the center of the printed circuit board 10 is mounted, and damage due to strain can be reduced.

Additionally, stacking connector 40a which supports and connects the two printed substrates 10 and 20 is because it is further arranged inward from the slit 10 b which is located most inward when viewed from the outer edge of the printed circuit board 10 The distortion due to the connection of the stacking connectors 40a and 40b is absorbed by the connecting portion 10d, and even if the height of the plurality of support columns 30 varies, the distortion due to the distortion of the region where the electronic components and the like at the center of the printed circuit board 10 are mounted. Breakage can be reduced, and poor electrical connection between the stacking connectors 40a and 40b can be reduced.

  In this embodiment, the printed circuit board 10 on the upper side of the two printed circuit boards 10 and 20 is the printed circuit board having the structure of the first embodiment. Damage can be reduced by mounting.

  If the lower printed circuit board 20 is also a printed circuit board having the structure of the first embodiment, it is more preferable because damage to the lower printed circuit board can be reduced.

Moreover, the shape of the stacking connectors 40a and 40b is an example, and the shape is arbitrary. The position and orientation is also an example, need only be further disposed inward from the slit 10 b which is located most inward when viewed from the outer edge of the printed circuit board 10.

DESCRIPTION OF SYMBOLS 1, 10, 20: Printed circuit board 1a, 10a: Screw fastening hole 1b, 10b: Slit 10c: Screw fixing area 10d: Connection part 30: Support column 40a, 40b: Stacking connector 50: Screw 100: Printed circuit board connection structure

Claims (4)

The printed board (10) having a plurality of screw holes (10a) has a slit (10b) around the screw holes formed in the vicinity of the outer edge so as to surround the screw holes. In the printed circuit board that is formed and the inner region surrounded by the slit is the screw fixing region (10c) ,
The slit is formed to extend to the vicinity of the outer edge of the printed circuit board , the tip of which is a position surrounding substantially the entire circumference of the screw hole,
Prior Symbol screw fixing area, the printed circuit board, characterized in that it is connected only by a connecting portion of one point is an area sandwiched between the front end of the slit and the outer edge of the printed circuit board (10d).   The length of the connecting portion in the direction from the outer edge to the inside of the printed board is shorter than the length from the outer edge of the printed board to the center position of the screw hole in the same direction. The printed circuit board according to claim 1.   The printed board according to claim 1, wherein the slit is formed in a straight line. A printed circuit board connection structure (100) in which two printed circuit boards (10, 20) arranged to face each other at a predetermined distance are supported by a plurality of support columns (30) and stacking connectors (40a, 40b) between opposed surfaces. ) And
The printed circuit board according to any one of claims 1 to 3, wherein at least one of the two printed circuit boards is provided.
The printed circuit board coupling structure, wherein the stacking connector is disposed further inward than the slit located inwardly when viewed from the outer edge of the printed circuit board.

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