JPH01248687A - Connecting structure of flexible printed substrate - Google Patents

Abstract

PURPOSE:To improve the reliability and workability of soldering by mounting an electric component at a position concealed under a first printed substrate near a hole in a second printed substrate when the first and second printed substrates are connected. CONSTITUTION:At least one electrical part 5 is loaded near holes 4 for a second flexible printed substrate 2 at a position concealed under a first flexible printed substrate 1 when the first flexible printed substrate 1 and the second flexible printed substrate 2 are connected. When pectinate end sections 3 in the first flexible printed substrate 1 are inserted into the holes 4, the angles of insertion into the holes 4 are regulated by utilizing the electrical part 5, the pectinate end sections 5 can be easily be inserted only by singly pushing a section separate from connecting sections in the downward direction, and an operator need not push the pectinate end sections during connecting operation. Accordingly, connecting operation is facilitated, thus improving the workability, reliability and safety of the connecting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection structure for flexible printed circuit boards.

[Prior art] In a method for connecting two flexible printed circuit boards,
When connections are made by soldering, the structure must take into account soldering reliability and workability.

First, an example of the soldering structure of two conventional flexible printed circuit boards will be explained with reference to FIGS. 5 and 6.

In Figures 5 and 6, 1'' is the first flexible printed circuit board, 2° is the second flexible printed circuit board, 3'' is the comb-toothed end, 3a' is the soldering bat,
4" is a hole, and 4a' is a soldering bat.

That is, a first flexible printed circuit board 1' having a comb-shaped end portion of 3 degrees, and a hole. - On the second flexible printed circuit board 2°, keep the comb-shaped end 3° inserted into the hole 4° (see Figure 5), and connect the two by soldering to establish electrical connection. Take.

At that time, by inserting the comb-shaped end 3° into the hole 4°, the twisting and bending due to the flexibility of the two substrates 1°, 2°f) can be absorbed, and both the substrates 1°, Soldering was designed to take workability and safety into consideration, such as to prevent soldering from floating by 1° and 2" on both sides.

[Problems to be Solved by the Invention] However, when flexible printed circuit boards are connected to each other using the conventional structure shown in FIGS. 5 and 6, the following problem b< occurs.

First, if you do not hold down the area around 3° of the comb-shaped end,
Flexible printed circuit board 1.

When soldering 2′ to each other, the parts may come off, or the holes 4
The workability, safety, and reliability of soldering are poor because the product may deviate from the angle.

Second, the hole diameter of the 4° hole into which the 3° comb-shaped end is inserted is
If it is not larger than the 3° comb-shaped end, it will be difficult to insert the 3" comb-shaped end, especially when there are many 3" comb-shaped ends. If you don't touch the edge, the solder will flow poorly, resulting in poor workability and poor soldering reliability.

Thirdly, the former two substrates 1' and 2' intersect diagonally,
In order to match the direction of the hole row and the comb tooth row, the substrates must be twisted 1° and 2°, which makes it difficult to insert.
Therefore, workability and soldering reliability are poor.

The present invention seeks to solve the above problems.

That is, the present invention makes it easy to insert the comb-shaped end of the flexible first printed circuit board into the hole of the second printed circuit board, and securely fixes the end after insertion, thereby improving connection workability. The object of the present invention is to provide a flexible printed circuit board connection structure that can improve reliability and safety.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flexible first printed circuit board provided with a comb-like end portion having an exposed copper foil portion, and a flexible first printed circuit board provided with a comb-like end portion having an exposed copper foil portion. A second printed circuit board having a size that allows the copper foil to be inserted and having a hole drilled adjacent to the exposed copper foil portion, and the comb-shaped end portion is inserted into the hole and soldered or using a connecting member. In the connection structure for electrically conducting between the first and second printed circuit boards, on the second printed circuit board and in the vicinity of the hole,
At least one electrical component is mounted at a position hidden under the first printed circuit board when the first and second printed circuit boards are connected.

[Function] According to the present invention, when the flexible first printed circuit board and the second printed circuit board are connected, the flexible first printed circuit board is located at a position hidden under the first printed circuit board, and the second printed circuit board is connected. At least one electrical component is mounted near the hole, so when the comb-shaped end of the flexible first printed circuit board is inserted into the hole, the electrical component can be used to The angle of insertion into the hole is regulated,
Utilizing the elasticity of the flexible printed circuit board, the comb-shaped end inserted into the hole will not come out of the hole and will be securely fixed, making it possible to easily perform the connection work.

[Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention.

In FIG. 1, 1 is a first flexible printed circuit board having printed wiring on one or both sides, 2 is a second flexible printed circuit board having printed wiring on one or both sides, and 3 is a flexible printed circuit board having exposed copper foil. A comb-shaped end portion provided on the substrate 1, 3a is a soldering bat, 4 is a hole provided in the substrate 2, and 4a is a soldering bat. The hole 4 is provided close to the exposed portion of the copper foil.

Further, reference numeral 5 denotes an electrical component, which is mounted on the second flexible printed circuit board 2, located on the lower surface of the first flexible printed circuit board 1, and mounted near the hole 4.

Note that FIG. 1 shows a state in which the comb-like end portion 3 is inserted into the hole 4.

FIG. 2 shows that the comb-shaped end 3 is inserted into the hole 4 and the solder 6 is inserted into the hole 4.
This shows a state in which both the substrates 1.2 are electrically connected.

Next, to explain the operation, when the comb-shaped end portion 3 is inserted into the hole 4, the height t of the electrical component (electrical chip component) 5 (see Fig. 2) and the distance lII from the hole 4 to the mounting position.
! The angle θ° is determined by IJL.

Therefore, a force F in the direction of the arrow (see Fig. 2) is applied to the tip of the comb-toothed end 3, and the comb-toothed end 3 is biased toward the edge of the hole 4, and is pushed away from the hole 4. Soldering should be done before the board 1 or both boards 1 and 2.
This eliminates the work of holding down the board, and also eliminates soldering defects caused by floating of the board during soldering. At the same time,
The gap formed between the comb-shaped end portion 3 and the hole 4 becomes smaller,
Soldering properties are improved.

Furthermore, the height t of the electrical component 5 and the distance 1li from the hole 4
By controlling the angle θ° using the mounting position with ft fl, it is possible to adapt it to the size of the comb-shaped end 3 and the hole 4, improving workability and improving soldering reliability. .

Furthermore, as shown in FIG. 3, the first flexible printed circuit board 1 on the side where the comb-toothed end 3 is inserted into the hole 4 has a particularly large effect when the first flexible printed circuit board 1 is bent, twisted, and connected on a slope. Demonstrate. That is, when the first flexible printed circuit board 1 is twisted and further curved, and the second flexible printed circuit board 2 forms a slope, the comb-shaped end 3 is inserted into the hole by the electric component 5. 4 so that it can be easily inserted into the board 4, and the elasticity that tends to come off is suppressed by the electric component 5 to prevent it from coming out by applying lever stress to the board 1.

FIG. 4 shows a second embodiment of the present invention, and in this FIG. 4, reference numerals 1 to 5 are the same as in the first embodiment described above. Reference numeral 7 denotes an electric element, which is mounted on the second flexible printed circuit board 2. Reference numeral 8 denotes a flexible fixing portion extending an arm from the first flexible printed circuit board 1 .

In this second embodiment, when the comb-shaped end portion 3 is inserted into the hole 4, the electric element 7 mounted in the vicinity of the hole 4 is Use it.

That is, the fixing portion 8 is inserted into the gap 9 between the electric element 7 mounted on the second flexible printed board 2 and the surface of the board 2.

In this way, the elasticity of the first flexible printed circuit board 1 prevents the comb-shaped end portion 3 from coming out of the hole 4, and by using the fixing portion 8, the effect of preventing the comb-shaped end portion 3 from coming out is improved. do.

FIG. 7 is a detailed view of the soldering part of the prior art described above, and FIG. 8 is a detailed view of the soldering part of the present invention.

That is, in FIG. 7, the distance from the hole 4° to the surface of the comb-tooth end 3 is α. In FIG. 8, the distance from the hole 4 to the surface of the comb-tooth end 3 is α. That is, α゛〉
It turns out that 〉〉α.

[Effects of the Invention] As explained above, according to the present invention, when the first flexible printed circuit board and the second flexible printed circuit board are connected, at a position hidden under the first flexible printed circuit board, and , since at least one electrical component is mounted near the hole of the second flexible printed circuit board, when the comb-shaped end of the first flexible printed circuit board is inserted into the hole, the electrical component By using this, the angle of insertion into the hole is regulated,
It can be easily inserted by simply pushing downward on the part away from the connection part, and the comb-like end is pushed to the hole using the electrical component as a fulcrum, allowing nine workers to hold it down during the connection work. Connection work is made easier as there is no need to
The connection workability, reliability, and safety are improved. Furthermore, even if the diameter of the hole is increased to make it easier to insert the comb-toothed end, the comb-toothed end cannot be easily removed from the hole.
Similarly, workability, reliability, and safety are improved.

Moreover, the comb-shaped end can be easily inserted into the hole using the electric component as a guide without twisting the board, and in particular, the flexibility of the board can be easily inserted. When mounting with flexible shapes that take advantage of this, the workability of connecting both flexible printed circuit boards improves.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is a cross-sectional view, Fig. 3 is an explanatory diagram of the operation, and Fig. 4 is a perspective view showing the second embodiment of the invention. 5 is a perspective view showing an example of the conventional technique, FIG. 6 is an explanatory diagram of the operation, FIG. 7 is a perspective view showing details of the soldering part of the conventional technique, and FIG. 8 is a perspective view showing an example of the conventional technique. FIG. 2 is a perspective view showing details of the soldering part of the present invention. 1... First flexible printed circuit board 2... Second
Flexible printed circuit board 3... comb-shaped end
3a...Put 4...Hole 5 for soldering
...Electrical component 6...Half 1) 7...Electric element 8...Fixing part 9...Panel 1 Figure 1 One side t, t, < is double sided flexible) Ref 1 no) To OB-FLX (<L, with teeth) 2゛One-sided or double-sided flexible print) To-transition I 艮-FLX2 (,;\
3. Comb teeth 3α, soldering butt 4 holes 4o' solder I-size V-t 5' electric wA element (Chi-shifu parts) 6 Solder

Claims (1)

[Scope of Claims] 1. A flexible first printed circuit board provided with a comb-shaped end portion having an exposed copper foil portion, and a flexible first printed circuit board having a size that allows the comb-toothed end portion to be inserted and adjacent to the exposed copper foil portion. A second printed circuit board having a hole drilled therein, and electrical continuity between the first and second printed circuit boards by inserting the comb-shaped end into the hole and soldering or using a connecting member. In the connection structure, on the second printed circuit board and in the vicinity of the hole, at a position hidden under the first printed circuit board when the first and second printed circuit boards are connected, A connection structure for a flexible printed circuit board, characterized in that at least one electrical component is mounted. 2. The flexible printed circuit board connection structure according to claim 1, wherein the second printed circuit board is also a flexible printed circuit board.