JP2014046341A - Method and structure for mounting electric part on printed substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for mounting electric parts in a small mounting volume on a printed substrate, at a low cost and in a high extraction force.SOLUTION: There are provide a method and a structure for jointing an electric part and a printed substrate, in which a threaded rivet composed of a cylindrical trunk and cylindrical flanges and having a female thread internally threaded in the trunk is inserted and caulked in a mounting hole of a printed substrate, and as a result, a second flange is formed to clamp a printed board between the two flanges with the rivet, and then a male thread is screwed through a through hole of an electric part into the threaded rivet.

Description

  The present invention relates to a method and a structure for mechanically attaching a power supply circuit for electronic equipment and other electrical components to a printed circuit board.

  In the screw fixing method of electric parts to a printed circuit board, screw processing cannot be performed on the printed circuit board itself, so various parts for mounting are available on the market. Since there is no such component with strong pulling force in both directions, it must be assembled while paying attention to the direction that requires the pulling force when assembling, sometimes due to the component space (height direction) It may be difficult to use.

In Patent Document 1, a printed circuit board mounting structure having a small mounting area for connecting an earth pattern is provided. This is a technique of screwing to an adherend or the like in order to ensure its electrical grounding characteristics. Since a considerable space is required at the bottom of the printed circuit board, it is not suitable for reducing the size of the electronic device itself as in the present invention.

  Patent Document 2 discloses an invention of a threaded rivet caulking tool, but the threaded rivet itself is introduced as the prior art (FIG. 2). Here, by inserting an aluminum threaded rivet into the mounting hole and caulking the thin intermediate part where the female thread is not formed, the caulked intermediate part is used as a rivet flange, so that the threaded rivet becomes a plate It is fixed to.

JP 2000-307271 A Utility Model Registration No. 3103654

  In the invention described in the prior art document, a considerable space is required below the printed circuit board. This is because the female screw portion is provided at the lower part of the printed circuit board (in Patent Document 2, the female screw is cut only at the protruding end of the rivet).

In the present invention, after securing sufficient pulling strength, by reducing the height of the lower part of the printed circuit board and saving space, the electronic device as a whole can be reduced in thickness and weight. Let it be an issue.

The present invention includes a step of inserting a threaded rivet composed of a first flange part and a cylindrical part into which a female thread is machined into a cylindrical hole into a mounting hole of a printed circuit board;
A caulking step of applying a predetermined force to the first collar and the cylindrical tip to form a second collar on the cylindrical tip;
Installing an electrical component on the first or second collar;
A method of attaching an electrical component to a printed circuit board, comprising: attaching a mounting screw from the through hole of the electrical component to the inside of a cylinder of a threaded rivet and screwing the mounting screw.

Further, the present invention is a threaded rivet comprising a first collar and a cylindrical part, and internally threaded into the cylinder, wherein the second collar is formed at the tip of the cylinder by caulking, and the first and A threaded rivet secured by sandwiching the printed circuit board with the second collar,
A male screw-shaped mounting screw that is inserted through the cylindrical interior of the threaded rivet from the through hole of the electrical component installed in the first or second flange, and is fitted with the female thread inside the cylindrical section of the threaded rivet. A structure for attaching an electrical component to a printed circuit board.

As described above, according to the present invention, a screwed rivet is used inside the cylinder, a thin screw assembly is provided on the printed circuit board, and an electrical component can be easily and inexpensively attached to the printed circuit board.

The perspective view which shows the insertion condition of the screwed rivet and printed circuit board of this invention Sectional drawing which shows caulking of the threaded rivet of this invention Sectional drawing which shows the condition which attached the electrical component of this invention to the printed circuit board

(1) The perspective view which shows the insertion condition of the screwed rivet and printed circuit board concerning one Embodiment of this invention is shown in FIG. Each component will be described.

First, 1 is a threaded rivet. Reference numeral 2 denotes a flange (flange), which is formed in advance and is called a first flange. 3 is a cylindrical part. The cylindrical interior 4 is internally threaded.

On the other hand, 10 is a printed circuit board, and attachment holes 11 are formed corresponding to the outer shape of the cylindrical portion 3 of the threaded rivet 1, and the threaded rivets 1 are inserted into the attachment holes 11 of the printed circuit board 10.

Next, as shown in FIG. As shown in FIG. 2A, force (F) is applied from both the upper and lower directions of the threaded rivet 1 inserted into the printed circuit board 10 to caulk the lower portion of the cylinder.
As a result, as shown in FIG. 2B, the second flange 6 is formed at the tip of the cylindrical portion. At that time, the cylindrical portion 3 is somewhat deformed by the force from above and below, and the cylinder and the female thread are slightly raised inside, and a gap 5 is generated between the cylindrical portion 3 and the mounting hole 11 of the printed circuit board. However, it is sufficient that a force for sufficiently sandwiching the printed circuit board 10 between the first and second flange portions 2 and 6 is generated.

Note that a jig for caulking is not particularly required, but an appropriate base or the like may be provided on the upper and lower portions of the cylindrical portion.

Next, the process which comprises FIG. 3 is demonstrated.
After the threaded rivet is fixed to the mounting hole 11 of the printed circuit board 10, the electrical component 30 is fixed to the rivet. For this purpose, it is necessary that the through hole 31 is set in the electrical component 30 in advance, or the through hole 31 is provided with some attachment.

  Then, just above the threaded rivet sandwiching the printed circuit board 10, the electrical component 30 is aligned with the through hole 31 in the cylindrical interior 4 of the threaded rivet 1, and the mounting screw 20 is inserted from above. Then, the mounting screw 20 is tightened to the threaded rivet 1 with a screw. The gap 5 shown in FIG. 2B is crushed by an appropriate pressure, and the screw is fitted.

  The nominal length of the mounting screw 20 is sufficient as long as it is (the height of the electrical component) plus (the first to second collar part of the threaded rivet) and does not hinder the space efficiency of the printed circuit board. Should be. A washer or the like may be attached to the mounting screw 20.

  As described above, the embodiments of the present invention have been described. However, various modifications, expansions, and the like can be freely made, and such designs are within the scope of the present invention without departing from the spirit of the present invention. Should be understood. In particular, it can be freely applied vertically and horizontally.

DESCRIPTION OF SYMBOLS 1 Screwed rivet 2 1st collar part 3 Cylindrical part 4 Cylindrical inside 5 Cylindrical outside gap 6 2nd collar part 10 Printed circuit board 11 Attachment hole 20 Attachment screw 30 Electrical component 31 Electrical component through-hole

Claims (2)

Inserting a threaded rivet consisting of a first collar and a cylindrical part and internally threaded into the cylinder into the mounting hole of the printed circuit board;
A caulking step of applying a predetermined force to the first collar and the cylindrical tip to form a second collar on the cylindrical tip;
Installing an electrical component on the first or second collar;
Screwing a mounting screw through the electrical component through the bore of the threaded rivet and into the cylinder;
A method for attaching an electrical component to a printed circuit board, comprising:
A threaded rivet comprising a first collar part and a cylindrical part and internally threaded inside the cylinder, wherein a second collar part is formed at the tip of the cylinder by caulking, and the first and second collar parts Threaded rivets fixed with a printed circuit board sandwiched between them,
A male screw-shaped mounting screw that is inserted into the cylindrical interior of the threaded rivet from the through hole of the electrical component installed in the first or second flange, and is fitted to the female thread in the cylindrical interior of the threaded rivet;
A structure for attaching an electrical component to a printed circuit board, comprising:

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