JPH0732297B2 - Circuit component mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention comprises two substrates each having a plurality of corresponding electrode terminals, and a plurality of electrodes for connecting terminals of each substrate formed on an insulating film. When connecting with a flexible circuit board, it is possible to easily connect even if there is a gap between the corresponding terminals of each board, the flexible circuit board, the plane direction of the insulating film, In particular, the object is achieved as a structure having flexibility in the electrode arrangement direction.

[Industrial application field]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit component mounting structure for electrically connecting two substrates each having a plurality of corresponding electrode terminals by a flexible circuit substrate.

Flexible circuit boards such as flexible cables are widely used for this type of board-to-board connection. In this case, however, there is a structure that allows easy connection even if there is a gap between the corresponding terminals of each board. Requested.

[Conventional technology]

FIG. 6 is a perspective view showing the substrates 1 and 2 arranged to face each other, and FIG. 7 is a side view showing the state where the substrates 1 and 2 face each other. Also, the eighth
The figure is a plan view of a conventional flexible cable (flexible circuit board) 3 for connecting these boards 1 and 2. Each board 1,
Each of the terminals 2 has a plurality of electrode terminals 4 and 5 on its surface, and these terminals 4 and 5 are connected to the circuits formed on the substrates 1 and 2. The flexible cable 3 is formed by forming a plurality of electrodes 7 on a base film (insulating film) 6, and the arrangement pitch of the electrodes 7 is the same as that of the terminals 4 and 5 of each substrate. The flexible cable 3 is formed, for example, by using polyimide, polyester, or the like as a base material, attaching a metal plate having a thickness of several tens of μm thereto, and then removing unnecessary portions other than the electrodes of the metal plate by etching. . This flexible cable 3 connects the substrates 1 and 2 with each electrode 7
To one terminal 4 of the substrate 1 and the other end of each electrode 7 to the substrate 2
It is performed by connecting to each terminal 5 of.

[Problems to be solved by the invention]

In the conventional mounting structure using such a flexible cable 3, especially when the width of the electrodes 7 is narrow and the pitch between the electrodes is small, the positional displacement between the substrates (the displacement between the opposing terminals 4 and 5).
Is a problem. Then, in extreme cases, as shown in FIG. 7, when the amount of displacement a between the terminals becomes large, the connection becomes impossible.

[Means for solving problems]

The present invention is intended to provide a circuit component mounting structure capable of solving the above-mentioned problems, and as a means therefor, as illustrated in FIG. 1, a predetermined area of a flexible circuit board is provided. The insulating film inside is removed so as to straddle a plurality of electrodes between the electrodes, and the flexible substrate is used to connect the substrates.

[Action]

Since the insulating film in the predetermined area of the flexible circuit board is removed so as to straddle a plurality of electrodes between the electrodes, the flexibility of the insulating film in the plane direction, particularly in the electrode arrangement direction is improved. Greatly increased. Therefore, even if there is a deviation between the opposing terminals of each board to be connected using this flexible circuit board, the increased flexibility can be utilized to facilitate connection between the misaligned terminals. It becomes possible to carry out surely.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

A first embodiment is shown in FIGS. 1 and 2.

FIG. 1 is a plan view of the flexible circuit board 11, and FIG. 2 is a side view of the same. The flexible board 11 includes a plurality of pairs (four pairs in the case of the main side) extending in the left-right direction of FIG. Band-shaped polyimide film 1
A plurality of electrodes 13 are sandwiched between insulating films 12 composed of 2 ₁ , 12 ₂ , 12 ₃ , and 12 ₄ . Between each pair of polyimide films 12 ₁ , 12 ₂ , 12 ₃ and 12 ₄ there is a gap (removed part) 14,15,
16 are formed, and the respective electrodes 13 arranged at a predetermined pitch in the left-right direction in FIG. 1 are exposed at the gaps 14, 15, 16. That is, the insulating film 12 is removed so that a part of each electrode 13 is exposed at a plurality of positions in the vertical direction in FIG. The arrangement pitch of the electrodes 13 is equal to the arrangement pitch of the electrode terminals formed on each board to be connected by the flexible circuit board 11.

In this way, the insulating film 12 constituting the flexible circuit board 11 is deleted at a plurality of positions in the vertical direction of FIG.
Since each electrode 13 is exposed at the removed portions (the portions of the gaps 14, 15, 16), the flexibility of the insulating film 12 in the plane direction, particularly in the electrode arrangement direction is greatly increased. Therefore, even if there is a deviation between the opposing terminals of each board to be connected using this flexible circuit board, it is easy to connect the misaligned terminals by utilizing the increased flexibility. And it becomes possible to perform reliably.

In this case, the electrode 13 is exposed and exposed at the gaps 14, 15 and 16, but the polyamide film may be left on the exposed electrode. By doing so, the insulating film in the predetermined area of the flexible circuit board is removed between the electrodes, and the electrodes are protected and reinforced without being exposed by being exposed, and the insulating property is also improved. Also electrodes
An insulating film such as a resin may be applied to the exposed portion of 13 or another film may be attached.

A second embodiment is shown in FIG.

In the case of this example, the flexible circuit board 21 is composed of an insulating film 22 such as polyamide and an electrode 23, and the insulating film 22
Deleted portions 24, 24 are formed in the. As described above, in the flexible circuit board 21 of this example, the insulating film 22 is not completely removed in the left-right direction in FIG. 3, but a part of the insulating film 22 is left in a portion other than the electrodes. In FIG. 3, the places to be left are shown at the left and right ends and in the middle, but they may be left at other places. Part of each electrode 23 is exposed in the deleted portions 24, 24, and the action and effect in this case are similar to those of the previous example. Further, protection and reinforcement of the exposed electrode portion can be performed in the same manner as in the previous example.

The procedure for connecting circuit components using the flexible circuit board described in each of the above embodiments is shown in FIGS. FIG. 4 is a side view, FIG.
The figure is a cross-sectional view of FIG. The flexible circuit board 31 used in this case is of the type of the first embodiment (there is one gap where the insulating film is removed), and the opposing boards 32 and 3 are used.
3 is connected to the terminals 36, 3 of the electrodes 34, 35 formed on each substrate.
This is done by connecting each end of each electrode 38 of the flexible substrate 31 to 7. In this case, even if the opposing terminals 36 and 37 of each substrate are displaced in the horizontal direction as shown in FIG. 4 as described above, the connection between the substrates can be easily and reliably performed.

After the connection between the terminals is completed, the gap between the terminal connection portion and the portion where the insulating film is removed may be subjected to a treatment such as hardening with an insulating resin for further protection and reinforcement.

In the above description, the flexible circuit board having one layer of electrodes has been described, but it goes without saying that the flexible circuit board may have multiple layers of electrodes.

Further, it is of course possible to mount a predetermined circuit component on the flexible circuit substrate by adopting a substrate structure or an electrode structure capable of mounting a circuit component.

〔The invention's effect〕

As described above, according to the present invention, even if the opposing electrode terminals of each substrate to be connected are misaligned, the inter-substrate connection can be easily and reliably performed.

[Brief description of drawings]

FIG. 1 is a plan view of a flexible circuit board showing a first embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a flexible circuit board showing a second embodiment of the present invention. 4 is a plan view, FIG. 4 is a side view showing a circuit component mounting procedure of the present invention, FIG. 5 is a sectional view of FIG. 3, FIG. 6 is a perspective view showing a board arrangement, and FIG. 7 is a board facing state. Fig. 8 is a side view, and Fig. 8 is a plan view of a conventional flexible cable for board connection. In the figure, 11,21,31 are flexible circuit boards, 12,22 are insulating films, 13,23,38 are electrodes. , 14, 15, 16 and 24 are insulating film removed portions, 32 and 33 are substrates, and 36 and 37 are terminals (electrode terminals).

Claims (1)

[Claims] 1. A connection between terminals of each substrate, comprising: a first substrate having a plurality of electrode terminals; and a second substrate having a plurality of electrode terminals corresponding to the respective terminals of the first substrate. Connecting a plurality of electrodes for flexible circuit board formed in an insulating film, the insulating film in a predetermined region of the flexible circuit board, the plurality of electrodes between the electrodes A circuit component mounting structure characterized by being deleted so as to straddle electrodes.