JPS58300Y2 - printed board - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printed board, and particularly to a through hole in the printed board that facilitates insertion and temporary locking of components.

High-density packaging and high reliability of electrical circuit devices can be achieved, including miniaturization, by using printed wiring assembly techniques, but the printed wiring work process poses various problems in terms of work efficiency. It had been.

For example, when placing a component to be mounted on a printed circuit board in a predetermined position and soldering its leads, a great deal of labor and time is required for preliminary processing such as bending the component leads, so-called forming. Next, when inserting and soldering a single component onto a printed board, special efforts were required to prevent the component from falling off or shifting its position.

In particular, a temporary locking function for inserted parts is obtained by forming parts leads, but in general.

As the temporary locking function improves, the work of inserting parts becomes more difficult and efficiency decreases, which is contradictory.

Furthermore, in the case of normal printed wiring, the insertion hole of the printed circuit board is formed with a relatively generous thickness to facilitate the insertion of electronic component leads. defects had occurred.

In other words, for the purpose of facilitating the insertion of one component, for example, 0
．． When creating a clearance of 2m4 degrees, it becomes difficult to apply solder between the lead wire of the mounted component and the conductive land of the printed circuit board so as to cover the entire area of the clearance, and partial soldering may result in spots. This tends to result in incomplete solder connections.

Therefore, such soldering is undesirable because it reduces reliability and sometimes requires extra work to correct the soldering.

On the other hand, defects associated with partial solder connections could be improved by minimizing the clearance, but on the other hand, this would increase the difficulty of inserting component leads, and this type of problem could be completely eliminated. This will not solve the problem.

Therefore, the object of the present invention was proposed in view of the above, and is to provide a printed board that can achieve highly reliable solder connections without reducing the efficiency of mounting electronic components onto the printed board. There is a particular thing.

According to the present invention, the printed board has a relatively large through hole through which the component lead for mounting can be freely inserted, a relatively small through hole that is approximately equivalent to the component lead, and both of the above-mentioned feed holes. An insertion hole is provided that has an intermediate through-hole portion that communicates with the two portions.

For a mounting component having a normal pair of leads, a pair of leads are provided so that the aforementioned insertion holes correspond to a predetermined position □ of the mounting component and are point symmetrical.

Therefore, in printed wiring work using such a printed board, the lead wire of the mounted component is first inserted into a relatively large through hole, and then the inserted lead wire is inserted into a relatively small through hole. It can be moved and prepared for subsequent soldering work.

In this case, since the component leads can be easily inserted, forming as a preliminary process can be omitted or significantly simplified.

Further, when the inserted component lead moves, it can be frictionally engaged with the relatively small through hole, so that a temporary locking function can be obtained.

This temporary locking force can also be obtained by utilizing the elasticity of the lead wires by providing an insertion hole in advance so that the distance between the pair of lead wires changes as the lead wires move.

For example, in a device in which a pair of insertion holes are arranged point-symmetrically, the distance between the centers of the large through-hole and the distance between the centers of the small through-hole can be set differently to temporarily lock the parts using the elasticity of the component lead. function can be obtained.

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

FIG. 1 shows a printed board 1 according to the present invention.

This printed board 1 has a pair of insertion holes 2°3 for component leads.
is provided.

These insertion holes 2 and 3 each have a relatively large through hole portion 4.
,7. Relatively small through holes 5, 8. and intermediate through-hole portions 6 and 9 that communicate the two feeding hole portions, and are provided symmetrically with respect to a point 10.

FIG. 2 is a partial cross-sectional view showing the state in which the mounted component 11 is temporarily secured to the printed board 1.
3 is slightly deformed and is secured by relatively small through holes 5 and 8.

In other words, one component 11 is inserted into the insertion holes 2 and 3 of the printed board 1 through relatively large through holes 4 and 7, and after insertion, the component 11 is twisted to change the position of each lead wire. .

Therefore, the lead wires 12 and 13 are deformed from the state at the time of insertion (as shown by imaginary lines), and a restoring force is exerted to return them to their original state, thereby exerting a temporary locking function.

Note that 14 is a conductive pattern on the printed board 1, and according to the present invention, almost no clearance is formed in the relatively small through holes 5 and 8.

In other words, the relatively small through holes 5 and 8 are formed to have a thickness substantially equal to the cut surface of the component lead, and automatic soldering ensures reliable soldering in the process.

The above-mentioned embodiment is suitable for ordinary electronic component mounting in which a pair of insertion holes are provided point-symmetrically, but a similar method can be used for a printed wiring body such as a single lead support that is provided so as to penetrate through a printed board. A shaped insertion hole may be provided on one side.

In this case, the lead strut is inserted into a relatively large through hole and then moved to a relatively small through hole through a communicating through hole.

For example, the lead support can be inserted into the relatively small wedge-shaped through hole to temporarily lock the lead support.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a portion of a printed board according to the present invention, and FIG. 2 is a partial sectional view showing a state in which mounted components are temporarily secured to the printed board of FIG. 1. 1... Printed board, 2, 3... Insertion hole, 4゜7... Relatively large through hole, 5, 8...
...Relatively small through hole, 6,9...Communication through hole, 10...Symmetry point, 11...Mounted component, 12,13... ·····Lead.

Claims (2)

[Scope of utility model registration request] (1) A relatively large through hole through which the component lead can be freely inserted, a relatively small through hole approximately equivalent to the cross section of this component lead,
and an intermediate through-hole portion that communicates with both the feeding hole portions. (2) A pair of insertion holes are provided point-symmetrically corresponding to a predetermined position of the mounting component, and the mounting component is temporarily locked in a predetermined position by twisting after insertion. A printed board according to claim (1) of the utility model registration claim.