JPH0345511B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A method and connector for connecting flat cables used for high-speed signal transmission, in which the insulation coating near the end of the flat cable is peeled off to reveal a plurality of cables. By bending the signal line and ground line into a U-shape along the locator and fitting the connection part of the U-shaped contact from the outside, the signal line, ground line, and contact can be easily and securely connected. This is what I did.

[Industrial application field]

The present invention relates to a method for connecting flat cables and a connecting connector, and more particularly to a method for connecting flat cables for high-speed signal transmission and an improvement in the connecting connector.

A flat cable for high-speed signal transmission is a flat cable constructed by connecting multiple cables in parallel, each having one ground wire on each side of one signal line, and generally has signal lines with a pitch of 1.27 mm. between 2
A ground wire is provided.

Flat cables configured in this manner have emerged for mounting and wiring of high-performance and miniaturized electronic equipment, and flat cable connectors for high-speed signal transmission (hereinafter referred to as connectors) are used to connect signal lines. It includes a contact for connection, a contact for connection to a ground line, and a ground line.

[Conventional technology]

FIG. 10 is a perspective view of the main parts of a conventional flat cable connector for high-speed signal transmission.

In FIG. 10, a flat cable 1 for high-speed signal transmission includes a plurality of signal wires 2, a plurality of ground wires 3 disposed on the left and right sides of each signal wire 2, and a signal wire 2.
The flat cable 1 connected to the connector has an insulating coating 4 covering a grounding wire 3. The insulating coating at the tip of the flat cable 1 is peeled off to expose the tip of each signal line 2 and grounding wire 3.

In addition, in order to maintain the exposed arrangement spacing between the signal line 2 and the ground line 3, there is also a method of leaving the leading edge of the insulation coating 4 when peeling off the insulation coating.

The connector 5 includes an insulator 6, a plurality of contacts 7, and a grounding plate 8. Each signal line 2 is soldered to an opposing contact 7, and each grounding line 3 is connected to an opposing contact 7 by soldering.
is folded back from the base and connected to the ground plate 8 by soldering.

[Problem that the invention seeks to solve]

Traditional flat cable connection methods and connectors using solder connect signal line contacts to 1.27mm.
Although it is easy to arrange the flat cable in a pitch, it is troublesome to use a heating body for connecting the flat cable, making it difficult to improve work efficiency.

Therefore, a pressure-connection type connector was developed in which the conductor is press-fitted into the contact, the insulation coating near the contact of the flat cable is peeled off, and the signal wire 12 and the ground wire 13 at the peeled part are connected to a locator 25 made of an insulating material. A pair of projecting pieces 22 made of metal with spring elasticity are inserted into a plurality of U-shaped signal line insertion grooves 27 and ground line insertion grooves 28 formed in parallel in the
The U-shaped contact part of the signal line connection contact 22 with the protruding part a is inserted into the signal line insertion groove 27, and the signal line 12 is held between the locator 25 and the protruding piece 22a, and is made of metal with spring elasticity. A pair of protrusions 23
Insert the U-shaped contact part of the grounding line connecting contact 23 with the protruding part a into the grounding line insertion groove 28, and sandwiching the grounding line 13 between the locator 25 and the protruding piece 23a. Projection piece 23
A grounding terminal 29 for connecting a plurality of grounding line connecting contacts 23 in parallel is inserted into each of the grooves 23b formed between the opposing sides of the signal line connecting contacts 22 without coming into contact with the signal line connecting contacts 22. Furthermore, the flat cable connection method is characterized in that a pair of adjacent ground wires 13 are inserted into the same ground wire insertion groove 28.

Furthermore, in a connector for connecting a flat cable 11 in which signal wires 12 and ground wires 13 are regularly arranged, the connector is made of an electrically insulating material and has a U-shape in which the signal wires 12 of the peeled portions are inserted individually. Signal line insertion groove 2
7 and U-shaped ground wire insertion grooves 28 into which a pair of adjacent ground wires 13 are inserted together are formed alternately in parallel in the length direction; A plurality of signal line connection contacts 22 each having a U-shaped first connection portion from which a pair of projecting pieces 22a protrude on one side, and a second connection portion 22b for external connection on the other side.
and a pair of protrusions 23 made of metal with spring properties.
A plurality of ground line connection contacts 23 formed by forming a groove 23b for inserting a ground terminal 29 between protrusions of a U-shaped protrusion 23a from which a is protruded; a signal line connection contact 22; and the ground line connection contact 23. A plurality of signal line connection contacts 2 are arranged so that the protrusions 22a and 23a of 23 are aligned.
2 and the insulator 24 into which the grounding line connecting contacts 23 are inserted, and the grooves 23 of the plurality of grounding line connecting contacts 23 without coming into contact with the signal line connecting contacts 22.
Insert the grounding terminal 29 inserted into b and the U-shaped grooves 27 and 28 forming portions of the locator 25 between the pair of protrusions 22a and 23a of the signal line connection contact 22 and the ground line connection contact 23. This connector is characterized by comprising a supporting cover 26.

[Effect]

In the flat cable connection method and connector described above, the signal wire and the ground wire at the part where the insulation material has been peeled are folded back into a U-shape and attached to the locator, and the contact is inserted into the attached part and held between a pair of protrusions of the contact. Therefore, since the electrical connection is made without using solder, the connection is easy and does not cause any adverse effects such as heating of the connector components. Also,
By connecting two adjacent grounding wires to one grounding contact, the number of grounding contacts can be less than the number of grounding wires, and by connecting multiple grounding contacts with a grounding terminal, the connector can be grounded. Connection is extremely easy.

〔Example〕

Hereinafter, a connector according to an embodiment of the present invention will be explained using FIG. 1 and FIGS. 2 to 9.

Fig. 2 is a perspective view of a flat cable with part of the insulation coating removed, Fig. 3 is an exploded perspective view of a connector according to an embodiment of the present invention, and Fig. 4 is a front view and a side view of a signal line contact. B, Figure 5 is a front view A and its side view B of the grounding line contact, Figure 6 is a front view A and its side view B of the signal line contact to be connected to the ground, and Figure 7 is a bottom view A of the locator. 8 is a bottom view A and a side view of the grounding terminal, and FIG. 9 is a plan view A of a portion of the insulator and a sectional view taken along B-B.

In FIG. 2, a plurality of signal wires 12 and a pair of ground wires 13 sandwiching each signal wire 12 are covered with an insulating coating 14.
The flat cable 11 is covered with an insulating coating 1 shown by a two-dot chain line, leaving an insulating coating 14a at one end.
4 is removed.

In FIGS. 1 and 3, a connector 21 includes a signal line connection contact 22 and a ground line connection contact 23 made of metal having spring properties, and a plurality of contacts 2 each made of molded plastic.
2 and 23 are planted alternately, a locator 25 made of molded plastic and attached with the display signal line and signal line of the flat cable 11 in a U-shape, and a pair of members 30 made of molded plastic. a mutually engaged cover 26;
It consists of a grounding terminal 29 made of a metal plate.

The contact 22 connected to the signal line 12 is the fourth
As shown in the figure, a pair of protruding pieces 22a are made up of a U-shaped connecting part 22c that protrudes in parallel, and a connecting part 22b into which a mating terminal (not shown) is inserted. Protrusion 22 to be press-fitted
e, and a pair of elastic pieces 22 are provided at the connecting portion 22b.
It has f. The tip of the protruding piece 22a has a rounded protrusion 22g that protrudes inward.

The contact 23 connected to the grounding wire 13 is the fifth
As shown in the figure, a pair of protrusions 23a are U-shaped and protrude in parallel, and a pair of grooves 23b into which the grounding terminal 29 fits is formed between the opposing protrusions 23a, and insulation is provided on both sides of the lower end. Protrusion 2 press-fitted into body 24
3c is formed. The tip of the protruding piece 23a has a rounded protrusion 23d that protrudes inward.

Note that a part of the signal line 12 of the flat cable 11 is connected to ground, and a signal line grounding contact 31 is connected to the ground terminal 29 for external connection.
As shown in FIG. 6, a protrusion 31a is integrally formed on the contact 22, and at the center of the tip of the protrusion 31a that protrudes between a pair of opposing protrusions 22a, there is a groove to provide springiness to the tip. slit 31b
is formed.

As shown in FIG. 7, the locator 25 includes a signal line insertion groove 27 and a ground line insertion groove 28 that are U-shaped in side view.
are formed alternately, and have protrusions 25a at the ends in the length direction for fitting into and supporting the cover 26. However, the depth d ₂ of the groove 28 into which two ground wires 13 are inserted overlapped is 1 greater than the depth d ₁ of the groove 27 into which one signal wire 12 having the same thickness as the ground wire 13 is inserted. The depth is equal to the diameter of the ground wire 13 of the book,
Each groove 27, 28 has a recess 27a, 28 facing the protrusion 22g, 23d of the protruding piece 22a, 23a.
A is provided.

The grounding terminal 29 formed by pressing a metal plate has a U-shape in side view as shown in FIG. A plurality of through holes 29b are formed into which the projections 31a fit. However, the width W and height h of the terminal 29
When the contact 2 is inserted into the insulator 24 together with the contacts 22 and 23, as shown in FIG.
The dimensions are such that it does not come in contact with 2.

As shown in FIG. 9, the insulator 24 has a plurality of recesses 24 into which the connecting portions 22b of the contacts 22 are inserted.
a, and a connecting portion 22b drilled in the bottom of each recess 24a.
Through-hole 24b for inserting a mating terminal to be connected (inserted) to
and a plurality of grooves 2 in which the connecting portions 22c of the contacts 22 and the contacts 23 are alternately arranged in parallel at predetermined intervals.
4c, and a plurality of through holes 24d at the top.
It forms. As shown in FIG. 1, the lower part of each groove 24c is formed with a bulge 24d into which the protrusion 22e of the contact 22 or the protrusion 23c of the contact 23 is press-fitted.

A protrusion 30c that fits into the through hole 24d of the insulator 24
The cover member 30 is provided with a U-shaped tongue piece 30a at one end and a square projection 30b at the other end, and when the pair of cover members 30 are brought into contact with each other facing each other, one tongue piece 30a will touch the other projection. 30b, and both become engaged.

To assemble the connector 21 and connect the flat cable 11, first, the signal line contacts 22 are inserted into the insulator 24. At that time, the required contacts 31 are replaced with the contacts 22 and inserted.

Next, connect the grounding wire contact 23 to the insulator 24.
After the grounding terminal 29 is inserted into the contact 23, the terminal 29 can be connected to the outside of the connector 21 via the contact 31.

Next, a part of the insulating layer 14 is peeled off to expose the signal line 12 and the ground line 13 attached to the locator 25.
is inserted, and the attached portions of the signal wire 12 and the ground wire 13 are sandwiched between the protruding piece 22a of the contact 22 having spring elasticity and the protruding piece 23a of the contacts 23 and 31, and then the pair of cover members 30 are attached. , the assembly of the connector 21 and the connection of the flat cable 11 are completed.

〔Effect of the invention〕

As described above, according to the present invention, the spring elasticity of the pair of protruding pieces of each contact is utilized to connect the contact to the signal line and the ground line without using solder. This makes it much easier to connect the flat cable to the connector.
This has the effect of making a more reliable and stable connection than soldering.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a connector according to an embodiment of the present invention, FIG. 2 is a perspective view of a flat cable with a portion of the insulation coating removed, and FIG. 3 is an exploded perspective view of a connector according to an embodiment of the present invention. Figure 4 shows the signal line contact in Figure 3, Figure 5 shows the grounding line contact in Figure 3, Figure 6 shows the signal line contact for ground connection in Figure 3, and Figure 7 shows the locator in Figure 3. , FIG. 8 shows the grounding terminal shown in FIG. 3, FIG. 9 shows the insulator shown in FIG. 3, and FIG. 10 shows the main parts of a conventional connector. In the figure, 11 is a flat cable, 12
is a signal line, 13 is a grounding line, 14 is an insulation coating, 21
is a connector, 22 is a signal line connection contact, 2
2a is a protruding piece of the contact 22; 23 is a contact for connecting a grounding line; 23a is a protruding piece of the contact 23;
23b is a ground terminal 29 insertion groove, 25 is a locator, 26 is a cover, 27 is a signal line insertion groove, 28
2 shows a grounding wire insertion groove, 29 a grounding terminal, 30 a cover member, and 31 a signal line contact for grounding connection.

Claims (1)

[Claims] 1. Peel off the insulation coating near the end of the flat cable 11 in which a plurality of signal wires and ground wires are regularly arranged, and remove the insulation coating from the signal wire 12 and the ground wire 13 at the peeled portion. are respectively inserted into a plurality of U-shaped signal line insertion grooves 27 and ground line insertion grooves 28 formed in parallel on a locator 25 made of an insulating material, and a pair of protrusions 22 made of a metal with spring elasticity
The U-shaped contact portion of the signal line connection contact 22 with the protruding portion a is inserted into the signal line insertion groove 27, and the signal line 12 is held between the locator 25 and the protruding piece 22a, and has spring elasticity. A pair of protrusions 23 made of metal
Insert the U-shaped contact portion of the grounding wire connection contact 23 from which a is protruding into the grounding wire insertion groove 28 and sandwich the grounding wire 13 between the locator 25 and the protruding piece 23a to connect the grounding wire. A pair of protrusions 2 of the contact 23 for
A grounding terminal 29 for connecting a plurality of the grounding line connecting contacts 23 in parallel is inserted into the grooves formed between the opposing terminals 3a without coming into contact with the signal line connecting contacts 22. How to connect a flat cable. 2. The flat cable connection method according to claim 1, characterized in that a pair of adjacent ground wires 13 are inserted into the same ground wire insertion groove 28. 3 Peel off the insulation coating near the end of the flat cable 11 in which the signal wire 12 and the ground wire 13 are regularly arranged, and remove the signal wire 12 and the ground wire 1 from the peeled part.
3 to the contacts 22 and 23, respectively, a U-shaped signal line insertion groove 27 made of an electrically insulating material and into which the signal line 12 of the peeled part is inserted individually, and a pair of adjacent signal line insertion grooves 27. The locator 25 is made of a springy metal and has a pair of protrusions on one side. A plurality of signal line connection contacts 22 each having a U-shaped first connection portion with a protruding piece 22a and a second connection portion externally connected to the other side; A pair of protrusions 23
A plurality of ground line connection contacts 23 formed by forming grooves 23b for inserting a ground terminal between the U-shaped projecting pieces protruding from each other; the signal line connection contact 22; and the ground line connection contact 22. an insulator 24 into which a plurality of the signal line connection contacts 22 and the ground line connection contacts 23 are inserted so that the 23 protrusions 22a and 23a are aligned; and the signal line connection contacts 22. The ground terminals 29 inserted into the grooves 23b of the plurality of ground line connection contacts 23 without contact and the U-shaped groove forming portion of the locator 25 are connected to the signal line connection contacts 22 and the ground line. A connector comprising a cover 26 that is inserted between and supports the pair of protrusions 22a and 23a of the contact 23.