JPH04137405A - Tape wire and bonding structure between tape wire and printed wiring board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape electric wire used for internal wiring of electronic equipment, and a bonding structure between the tape electric wire and a printed wiring board.

[Conventional technology]

An example of a tape electric wire used for internal wiring of electronic equipment is shown in a plan view in FIG. In the figure, a tape wire main body 1 consists of a linear conductor (hereinafter simply referred to as a conductor) 11 made of a rectangular wire of copper or its plated wire, and an insulating tape 12 made of plastic, and has a required number of conductors ll. Insulating tape 12 is arranged in parallel at equal intervals, and
The conductors 11 are formed integrally with each other in a sandwich-like manner, and the conductors 11 are exposed at both ends.

By the way, when connecting the tape electric wire main body 1 as described above to a printed wiring board, as shown in FIG.
A double-sided adhesive tape 4 with a release paper pasted on one side is pasted near the terminal of the terminal, and when connecting the tape electric wire l to the printed wiring board, peel off the release paper from the double-sided adhesive tape 4 and attach it to the printed wiring board. The exposed conductor portion of the tape wire body 1 is bonded to the circuit conductor on the printed wiring board by soldering or the like, so that the tape wire body 1 does not move.

[Problem to be solved by the invention]

When fixing the tape electric wire body 1 as described above to a printed wiring board using double-sided adhesive tape 4, first apply the double-sided adhesive tape 4 to the desired position of the wire body 1, and then Furthermore, positioning is difficult and troublesome when adhering accurately to a desired position on a printed wiring board. In other words, if the circuit width and circuit pinch are wide to a certain extent, even if the conductor of the tape wire and the circuit conductor on the printed wiring board are slightly misaligned, the connection strength will be ensured and short circuits will not occur between the circuits, and alignment will not be difficult. accuracy is not required. However, as circuits have become finer in recent years, slight misalignment of the solder has caused problems such as insufficient soldering strength and the occurrence of short circuits between circuits. In addition, in the bonding structure using double-sided adhesive tape, the insulating tape of the tape electric wire must overlap the printed wiring board, and there is a problem that it is impossible to fix the tape tvA at the edge of the printed wiring board. . In addition, double-sided adhesive tapes lack adhesive strength, and even a small amount of external force may apply force to the joints of the conductors, causing them to peel and cause poor continuity. Further, in the case of the shielded tape ii'ia, connection between the drain wire and the shield layer requires connection to a jumper on the tape electric wire side or a through hole on the printed wiring board side, making the process complicated and expensive.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and the structure of the tape electric wire includes longitudinal slits that open at the longitudinal edges of the insulating tape at both ends of the tape tmO in the width direction. Alternatively, a reinforcing tape is pasted at or near the end of the tape electrical wire, and longitudinal slits are provided at both ears of the reinforcing tape, opening at the longitudinal edges thereof. In addition, as a tape electric wire to be connected to a printed wiring board where the printed wiring board to which the tape electric wire is connected is a double-sided printed wiring board and has a circuit conductor on one side and a ground circuit conductor on the other side, as described above, The tape electric wire has a structure in which grounding drain wires passing through at least one of the tongue pieces formed on both sides by providing slits are arranged.

When the printed wiring board is a flexible printed wiring board (hereinafter simply referred to as FPC), the bonding structure between the tape electric wire and the printed wiring board is as shown below.

A U-shaped notch having a width equal to the spacing between both slits of the tape electric wire as described above is provided at the end of the FPC wiring board, and both tongue pieces of the tape electric wire are formed on one surface of the printed wiring board, and the two tongue pieces of the tape electric wire are formed on the other surface. The printed wiring board and the tape electric wire are combined so that the intermediate portions between the two tongue pieces are overlapped and the bottom edge of the cutout reaches the innermost part of both the slits, and the bare conductor of the tape electric wire is printed wiring. It has a bonding structure of a tape electric wire and a printed wiring board, which are overlapped and bonded to the circuit conductor of the board.

Further, when the printed wiring board is relatively thick like a rigid printed wiring board (hereinafter simply referred to as RPC), a bonding structure as shown below is used.

A notch consisting of an inclined surface with a width equal to the spacing between both slits of the tape electric wire similar to the above is provided at the end of the RPC, and both tongue pieces of the tape electric wire are on one side of the printed wiring board, and on the other side. The printed wiring board and the tape electric wire are combined so that the intermediate parts between the two tongue pieces are overlapped and the edge of the printed wiring board reaches the innermost part of both the slits, so that the bare conductor of the tape electric wire is connected to the printed wiring board. This is a bonding structure of a tape electric wire and a printed wiring board, which are overlapped and bonded to a circuit conductor.

Note that, if necessary, an adhesive or heat-sensitive adhesive is applied to the surface of the tongue of the tape electric wire that faces the printed wiring board.

[Effect]

By constructing the tape wire as described above and at the same time providing the above-mentioned notch in the printed wiring board, when joining the tape wire to the printed wiring board, the printed wiring board can be bonded between both tongues of the tape wire and the intermediate portion thereof. Since it is attached in a sandwiched manner, positioning is easily achieved by using the notch in the printed wiring board.Also, the printed wiring board is sandwiched between tape electric wires, and adhesive is applied to the tongue piece. If you leave it in place, the holding force will increase and it will be easier to join the conductors. Further, if a heat-sensitive adhesive is used instead of this adhesive, the tape electric wire will be bonded to the printed wiring board by the heat generated when the conductors are bonded, and the fixing strength will be increased.

〔Example〕

The portion indicated by solid lines in FIGS. 1 to 4 is a plan view showing an embodiment of the tape electric wire according to the present invention.

In these figures, the wire is a tape wire body, 2 is a reinforcing tape, 11 is a conductor, 12 is an insulating tape made of plastic, 13 is a grounding drain wire, 14 is a slit, and 15 is formed by providing a slit 14. It is a tongue piece. The grounding drain wire 13 is usually the conductor 1
The same plated wire is used for wires made of the same material and size as No. 1, mainly up to copper. The reinforcing member 12 is mainly made of heat-resistant resin such as fluororesin or polyimide resin. Note that the same parts as those in FIG. 6 of the conventional example are indicated by the same reference numerals, and detailed explanation will be omitted.

FIG. 1 is an embodiment of the tape electric wire according to claim 1,
A long horizontal slit 1 is provided at both ends of the insulating tape 12 on the outside of the group of conductors 11 in the width direction.
4 and a tongue piece 15 is formed.

FIG. 2 is an embodiment of the tape electric wire according to claim 2,
A grounding drain wire 13 is attached to the tongue piece 15 similar to FIG.
In other words, a group of conductors 11 and drain wires 13 for grounding are arranged on both sides thereof, and a slit 14 is formed in a portion of the insulating tape 12 between the group of conductors 11 and the drain wires 13. Although the drain wire 13 is provided on both sides, if necessary, the drain wire 13 may be provided on only one side.

FIG. 3 is an embodiment of the tape electric wire according to claim 3,
A reinforcing tape 2 is affixed to the exposed part of the conductor 11 on one side of the end of the tape wire body l, spanning the insulating tape 12, and a reinforcing tape 2 is affixed to the exposed part of the conductor 11, spanning the insulating tape 12. This is a tape electric wire in which a tongue piece 15 is provided and a tongue piece 15 is formed.

FIG. 4 is an embodiment of the tape electric wire according to claim 4,
The reinforcing tape 2 in FIG. 3 above is the tape electric wire body l.
This is a tape electric wire that is attached near the terminal part of the insulating tape I2, and can be used even if there is a circuit conductor at the back of the FPC.

In addition, in FIGS. 1 to 4, the imaginary lines shown by two-dot chain lines indicate the FPC when the tape electric wire is attached.

FIG. 5 is a diagram illustrating a bonding structure between a tape electric wire and an FPC according to claim 5, in which (a) is a conceptual plan view of the end of the FPC, and (b) to (e) are schematic diagrams of the bonding structure. FIG. A U-shaped notch 31 is provided at the end of the FPC 3 as shown in FIG. The spacing between the slits 14 is the same as that between the slits 14 . In addition, 32
is a patterned circuit conductor.

Figure 5 (B) is a schematic cross-sectional view of the combination of the tape electric wires shown in Figure 1, Figure 5 (9) is a plan view of Figure 5 (B), and Figure 5) is the tape shown in Figure 2. FIG. 5(E) is a schematic cross-sectional view of the tape electric wire shown in FIG. 3, and FIG. 5(F) is a schematic cross-sectional view of the tape electric wire shown in FIG. 4 combined with the FPC 3. In these figures, the middle part between the slits 14 of the tape electric wire 1 is on the upper side of the FPC 3, and the tongue piece 15 is on the lower side so that the conductor 11 of the tape electric wire 1 is in contact with the circuit conductor 32 formed on the upper surface of the FPC 3. The FPC 3 is attached so that the bottom edge of the three notches reaches the innermost part of the slit 14.

Note that an adhesive or heat-sensitive adhesive is applied to the surface of the tongue piece 15 facing the FPC, if necessary. The conductor 11 and circuit conductor 32 mounted in this manner are joined by soldering or the like.

In FIG. 5), the FPC 3 is a double-sided printed wiring board, the circuit conductor 33 constitutes a ground circuit, and the drain wire 13 of the tape electric wire is connected.

FIG. 6 shows an example in which the tape electric wire 1 shown in FIG.
5A is a sectional view taken along the line A-A in FIG. 5A, and in these figures, 34 is a notch made of an inclined surface, and the width thereof is the same as the notch 31 in FIG. 5. FIG. 6 (/9 is a schematic cross-sectional view of the RPC5 combined with the tape electric wire main body l of FIG. Since it is almost the same as the case and can be easily understood, it will be omitted.

Note that the tape electric wires shown in FIGS. 1 to 4 can be used as appropriate depending on the configuration of the circuit conductor in FPC or RPC.

〔Effect of the invention〕

If the tape electric wire according to the present invention is used and the tape electric wire according to the present invention and a printed wiring board are bonded, the printed wiring board can be temporarily fixed by sandwiching the tape electric wire at the slit portion, and soldering can be performed as in the conventional method. When applying double-sided adhesive tape to the same position on insulating tape and when applying it to a printed wiring board, work efficiency is improved by eliminating the need to peel off the release paper, and the shape of the reinforcing tape can be obtained by punching, making it easier to apply double-sided adhesive tape. Productivity is improved compared to

In claims 1, 3 and 4, if an adhesive is applied to the tongue portion, the holding force during temporary fixing will be strengthened, and it can also be used in cases where accurate positioning is required, such as when the conductor spacing is narrow. In addition, if a heat-sensitive adhesive is used instead of this adhesive, the heat will bond the conductor at the same time as it is soldered, increasing the fixing strength, and the bond between the printed wiring board and the conductor will not peel off even if external force is applied. No conduction failure occurs. Such adhesives and heat-sensitive adhesives can be selected as necessary, and they can also be used in common. When the tape electric wire of claim 2 is used in the case of a double-sided printed wiring board, there is no need to provide through holes, which is convenient. Moreover, if the tape electric wire of claim 4 is used, even if there is a circuit conductor to be bonded at the back of the printed wiring board, it can be bonded. Alternatively, if the tape electric wire is selected appropriately, it can be fixed at the edge portion of the printed wiring board.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the tape according to claim 1;
FIG. 2 is a plan view of an embodiment of the tape electric wire according to claim 2;
FIG. 3 is a plan view of an embodiment of the tape electric wire according to claim 3;
FIG. 4 is a plan view of an embodiment of the tape electric wire according to claim 4;
FIG. 5 is a diagram illustrating a bonding structure between a tape electric wire and a flexible printed wiring board according to claim 5, in which (a) is a schematic plan view of the flexible printed wiring board, and (b) is a schematic plan view of the flexible printed wiring board.
Q9 is a schematic cross-sectional view of a bonding structure between a tape electric wire and a flexible printed wiring board, Q9 is a plan view of (b), and 2) is a schematic cross-sectional view of a bonding structure between a tape electric wire and a flexible printed wiring board according to claim 2. , (E) is a schematic sectional view of a bonding structure between a tape electric wire and a flexible printed wiring board according to claim 3, and (F) is a schematic sectional view of a bonding structure between a tape electric wire and a flexible printed wiring board according to claim 4. , Figure 6 is a rigid printed wiring board, (a) is a schematic plan view, (b)
is a sectional view, Q9 is a schematic sectional view of a joint structure with a tape electric wire according to claim 1, and FIGS. 7 and 8 are plan views of conventional examples of tape electric wires. 1: Tape wire body, 2: Reinforcement tape, 3: Flexible printed wiring board, 5: Rigid printed wiring board, 1: Linear conductor (conductor), 12: Insulating tape, 13: Drain wire, 14 Nislit, 15: Tongue Piece, 31: U-shaped notch, 32: Circuit conductor.

Claims (5)

[Claims] 1. In a tape electric wire in which a required number of wire conductors are arranged in parallel between insulating tapes, sandwiched and tightly integrated, and the wire conductors are exposed at least at one end, the outside in the width direction of the wire conductor group. A tape electric wire characterized in that a tongue piece is formed by providing a longitudinal slit opening at the longitudinal end of the insulating tape ear. 2. 2. The tape electric wire according to claim 1, wherein a grounding drain wire is arranged along the entire length in the longitudinal direction passing between the insulating tapes of the tongue portions on at least one side. 3. A required number of wire conductors are arranged in parallel between insulating tapes, sandwiched and tightly integrated, and the wire conductors are exposed at least at one end. A reinforcing tape is affixed to the surface, and a tongue piece is formed by providing a longitudinal slit opening at the longitudinal end of the reinforcing tape ears located on both sides of the bare wire conductor group. Characteristic tape electric wire. 4. 4. The tape electric wire according to claim 3, wherein the reinforcing tape is attached at a position near an end of the insulating tape in the longitudinal direction. 5. A U-shaped notch having a width equal to the spacing between both slits of the tape electric wire according to any one of claims 1 to 4 is provided at an end of the flexible printed wiring board, and both tongue pieces of the tape electric wire are provided on one surface of the printed wiring board. However, the printed wiring board and the tape electric wire are combined so that the intermediate portions between the two tongue pieces are overlapped on the other surface, and the bottom edge of the cutout reaches the innermost part of both the slits, so that the tape electric wire is exposed. A bonding structure between a tape electric wire and a printed wiring board, characterized in that an output conductor is overlapped and bonded to a circuit conductor of the printed wiring board.