CN1747076B - flat cable - Google Patents

Abstract

The flat cable of the present invention utilizes a plurality of coaxial cables (20) composed of a core wire (21), an inner peripheral insulating coating (22), a shielding layer (23) and an outer peripheral insulating coating (24). The holding strips (27) are arranged in parallel and kept on the same plane to form a flat cable. In the flat cable, the end of the coaxial cable (20) protruding outward from the end of the holding strip (27) is at the Within the range of the first predetermined length (a), peel off the outer peripheral side insulating coating layer (24) and the shielding layer (23) to form a crimping portion (22a), and the crimping portion (22a) from the inner end of the crimping portion (22a) 2 Within the range of the specified length (b), leave the outer peripheral side insulating coating (24a) and the outer peripheral side insulating coating (24b) of the specified width (c), and peel off the outer peripheral side insulating coating (24) to form a ground connection Section (23a).

Description

flat cable

technical field

The present invention relates to a flat cable in which a plurality of coaxial cables are arranged and held in parallel on the same plane.

Background technique

Conventionally, there is generally known a coaxial cable in which a core wire extending linearly is covered with an inner peripheral side insulating coating layer, an outer periphery of the inner peripheral side insulating coating layer is covered with a shielding layer, and a coaxial cable is used on the outer peripheral side A coaxial cable in which an insulating coating covers the outer periphery of the shielding layer. In recent years, there has been a tendency to particularly reduce the diameter of coaxial cables. For example, an ultra-thin coaxial cable having a core wire diameter of approximately 0.1 mm and an overall diameter (diameter of the insulating coating on the outer peripheral side) of approximately 0.35 mm has been used. There is also known a flat cable in which a plurality of such coaxial cables are arranged in parallel and kept on the same plane (see, for example, Japanese Patent Application Laid-Open No. 10-144145).

Such a flat cable is used with a connector attached to its end, and when the connector is attached, at the end of the flat cable, the outer and inner peripheral sides of the coaxial cable are stripped of the insulating coating and shielding layer to expose the core The wires are soldered to each contact of the connector, or only the outer peripheral side insulating coating and shielding layer are peeled off, so that the inner peripheral side insulating coating in the state of covering the core wire is exposed, and the part is pressed against the contact parts. crimp connection.

However, in the flat cable constituted using the ultra-fine coaxial cable as described above, the core wire is exposed for soldering to the contact, or the insulating coating layer on the inner peripheral side is removed for crimp connection to the contact. When exposed, since the coaxial cable itself is very thin, and at the front end of the coaxial cable where the core wire, the inner peripheral side insulating coating, etc. are exposed in this way, each coaxial cable cannot be held by a holding tape or the like, so there is a problem. The problem is that the processing of exposing the core wire, the inner peripheral side insulation coating layer, etc. is very difficult due to the deformation of the tip portion.

In addition, the above-mentioned Patent Document 1 discloses a method of brazing two sets of ground rods (metal foils) on the shield layer exposed by peeling off the outer peripheral insulating coating layer, bending the two sets of ground rods and Cut the shielding layer in between and remove the shielding layer together with the ground rod at the front end. However, this method has problems in that many processing steps are required, such as brazing work for the ground rod, and the processing work takes time and effort.

Contents of the invention

The present invention has been made in view of the above-mentioned problems, and its object is to provide a flat cable with a simple operation to expose the inner peripheral side insulating coating layer to be crimped and connected to the contact, and to provide a shield on the root side. A flat cable in which one layer is exposed and the wires that make up the shield do not become loose.

In order to achieve such an object, the flat cable of the present invention is a flat cable obtained by arranging a plurality of coaxial cables in parallel and keeping them on the same plane. The coaxial cable has: a core wire extending linearly; The insulating covering layer on the inner peripheral side; the shielding layer provided to cover the outer periphery of the insulating covering layer on the inner peripheral side; and the insulating covering layer provided on the outer peripheral side to cover the outer periphery of the shielding layer. And, at the end of the coaxial cable of the flat cable, within a range of a first predetermined length from the front end, the outer peripheral side insulating coating layer and the shielding layer are peeled off to expose the inner peripheral side insulating coating layer to form a In the crimping part, in the range of the second predetermined length from the inner end of the crimping part, when the outer peripheral side insulating coating layer and the ring-shaped outer peripheral side insulating coating layer of a predetermined width on the front end side are left, the shielding layer is exposed The outer peripheral side insulating coating layer is partially peeled off to form a ground connection part, and the remaining outer peripheral side insulating coating layer integrally connects the remaining ring-shaped outer peripheral side insulating coating layer and the outer peripheral side insulating coating layer .

In addition, the following structure can be made: a plurality of coaxial cables are arranged in parallel and maintained on the same plane by a holding tape to form a flat cable, and the ends of the coaxial cables protrude outward from the ends of the holding tape. The end of the coaxial cable is formed with a crimp and a ground connection.

In this flat cable, it is preferable that the insulating coating layer and the shielding layer on the outer peripheral side are cut with a YAG laser at a position of the first predetermined length from the front end of the coaxial cable, and the cable is pulled out within the range of the first predetermined length. The insulating coating layer and the shielding layer on the outer peripheral side of the outer peripheral side, and expose the insulating coating layer on the inner peripheral side to form a crimping part. 2. A CO ₂ laser is irradiated to the region other than a part of the side surface in the range of the predetermined length to melt and remove a part of the insulating coating layer on the outer peripheral side to form a ground connection portion.

In the flat cable having the above structure, in the range of the second predetermined length from the inner end of the crimping part, an outer peripheral side insulating coating layer of a predetermined width is left on the front end side and a part of the side surface, and the outer peripheral side insulating coating layer is peeled off to form There is a ground connection part, and the shield layer exposed on the ground connection part is formed by the outer peripheral side insulating coating layer with a predetermined width left on the front end side and the outer peripheral side side insulating coating layer remaining on a part of the side supporting it. Therefore, the many horizontally wound ultra-fine wires forming the shielding layer are not loosened randomly, and the connection reliability when the shielding layer is grounded can be improved while the connector is crimped and connected to the front end of the flat cable. In addition, since the outer insulating coating layer and the shielding layer are cut with a YAG laser, and the CO ₂ laser is irradiated to melt and remove the outer insulating coating layer to form a ground connection portion, there is no damage to each coaxial cable at the front end of the flat cable. An external force that bends or deforms them does not deform them but maintains the correct spacing in their original shape. Therefore, the work of crimping and connecting the connector to the front end of the flat cable can be performed with high precision.

In the flat cable of the present invention having the above-mentioned structure, in the range of the second predetermined length from the inner end of the crimping part, the outer peripheral side insulating coating layer is left on the predetermined width of the front end side and a part of the side surface, and the outer peripheral side insulating coating layer is peeled off to form a ground connection. The connection part, the shielding layer exposed on the ground connection part, is held by the outer peripheral side insulating coating layer with a predetermined width left on the front end side, so many horizontally wound ultra-fine wires forming the shielding layer will not loosen randomly. While crimping the connector to the front end of the flat cable, it is possible to improve connection reliability when grounding the shielding layer. In addition, since a portion of the side surface remains in the range of the second predetermined length except for the outer peripheral insulation coating layer of the predetermined width on the front end side, the outer peripheral insulation coating layer on the front end side can be stabilized, and the formation of shielding can be effectively prevented. Many horizontally wound extremely thin wires of the layer are irregularly loose. In addition, since the outer insulating coating and shielding layer are cut with a YAG laser, and the CO ₂ laser is irradiated to melt and remove the outer insulating coating to form a ground connection, it does not affect the coaxial cable at the end of the flat cable. External forces such as bending or deforming them will not deform them but maintain the correct grade in their original shape. Therefore, the work of crimping and connecting the connector to the front end of the flat cable can be performed with high precision.

Comparing the manufacturing method of the flat cable of the present invention with the method of the above-mentioned Patent Document 1, it can be seen that in the present invention, a flat cable can be manufactured by a simple manufacturing method with a particularly small number of man-hours. In addition, since the process of fixing the ground rod to the shield layer by soldering as in Patent Document 1 is not required, and solder is not used, environmentally friendly manufacturing can be performed.

Description of drawings

Fig. 1 is a plan view (A) showing a flat cable before being processed into a flat cable according to the present invention and a perspective view (B) showing the structure of a coaxial cable constituting the flat cable.

Fig. 2 is a plan view showing the structure of the end portion in the middle of processing to form the flat cable of the present invention.

Fig. 3 is a plan view (A) and a perspective view (B) showing the end structure of the flat cable of the present invention.

Fig. 4 is an exploded perspective view showing a connector connected to the flat cable of the present invention.

Fig. 5 is a cross-sectional view showing a state in the middle of the manufacture of a cable with a connector formed by connecting a connector to an end portion of the flat cable of the present invention.

Fig. 6 is a cross-sectional view showing a cable with a connector formed by connecting a connector to an end portion of the flat cable of the present invention.

Fig. 7 is a perspective view showing a structure of an end portion of a flat cable having a structure different from that of the flat cable described above.

Fig. 8 is a cross-sectional view showing a cable with a connector formed by connecting a connector to an end portion of the flat cable.

Detailed ways

Hereinafter, best embodiments of the present invention will be described with reference to the drawings.

[Example 1]

First, the structure of the flat cable to which the present invention is applied will be described with reference to FIGS. 1 to 3 . As shown in FIG. 1(A) , the flat cable FC is configured by arranging a plurality of ultra-thin coaxial cables 20 in parallel and at equal intervals by using a holding tape 27 , and connecting and maintaining them on the same plane. In addition, the holding band 27 can hold a plurality of coaxial cables 20 from both sides, or it can be provided on only one side.

FIG. 1(B) shows the structure of each coaxial cable 20. An inner peripheral insulating coating layer 22 made of an insulating material is provided around a core wire 21 formed by twisting a plurality of (here, seven) ultra-fine wires. A plurality of ultra-fine wires are horizontally arranged on the outer periphery of the inner peripheral side insulating coating layer 22 to form a shielding layer 23, and an outer peripheral side insulating coating layer 24 made of an insulating material is arranged on the outer periphery of the shielding layer 23 to form the same Shaft cable 20. The coaxial cable 20 has a very thin diameter, for example, the outer diameter of the core wire 21 is about 0.1 mm, and the overall outer diameter (the outer diameter of the insulating coating layer 24 on the outer peripheral side) is about 0.35 mm.

The flat cable of the present invention is processed into a shape in which the end portion of the flat cable FC having such a structure can be crimped and connected to the connector as it is, and the processing and forming steps will be described below. First, as shown in FIG. 1(A), at the end of the flat cable FC, the holding tape 27 is peeled off to expose the ends of the coaxial cables 20 in a state of being aligned in parallel. Then, a YAG laser is irradiated at a position at a first predetermined distance a from the end face of these coaxial cables 20 (the position indicated by X-X in FIG. Cutting processing.

And, when a holding tape or the like is attached to the part of the outer end side from the cut position (position indicated by X-X) in this way, and when the outer end side is pulled out together from the cut position of the coaxial cable 20, only The outer peripheral insulating coating layer 24 and the shielding layer 23 are peeled off from the cutting position and removed. In this way, FIG. 2 shows a state in which the outer peripheral side insulating coating layer 24 and the shielding layer 23 on the outer end side are removed from the cutting position. As can be seen from this figure, the inner peripheral side insulating coating layer 22 is exposed from the front end to the cutting position. . In addition, the exposed portion of the inner peripheral insulating coating layer 22 is referred to as a crimping portion 22a.

Next, in the range from the above-mentioned cutting position (that is, the inner end position of the crimping part) to the second predetermined distance b, from the above-mentioned cutting position, the part other than the range of the predetermined width c is irradiated with _CO2 laser, and the outer peripheral side is insulatingly coated. Layer 24 is partially melted away. As a result, as shown in FIG. 3(A) and (B), the insulating coating layer 22 is exposed on the inner peripheral side of the first predetermined distance a from the front end side, and a crimp connection portion 22a is formed. Within the range of the second predetermined distance b, the ring-shaped outer peripheral side insulating coating layer 24a and the outer peripheral side insulating coating layer 24b of a predetermined width c are left, and the shielding layer 23 is exposed in the remaining part. The exposed portion of the shield layer 23 is called a ground connection portion 23a. Since the shielding layer 23 is formed by laying many ultra-fine wires horizontally, in the state where the shielding layer 23 is exposed as it is, the ultra-fine wires tend to be loose and irregular at the ground connection portion 23a, but by doing so, If the ring-shaped outer peripheral side insulating coating layer 24a is left, each ultra-fine electric wire can be held and prevented from becoming irregular. At this time, since the outer peripheral side insulating coating layer 24b fixes the ring-shaped outer peripheral side insulating coating layer 24a and the outer peripheral side insulating coating layer 24 as a whole, the function of the outer peripheral side insulating coating layer 24a to hold each ultra-fine electric wire can be improved. Stablize.

In this way, the flat cable in the state where the end portion is processed is the flat cable FC according to the embodiment of the present invention. Referring to FIGS. illustrate.

First, the structure of the plug connector PC connected to the end of the flat cable FC configured as described above will be described. Plug connector PC is made of crimping cover 1 and connector body 5. As shown in FIG. 4, the end portion of the flat cable FC of the above-mentioned structure is attached to the crimping cover 1, and the crimping cover 1 is pressed against the connector body 5, that is, in the direction of the arrow A, to manufacture a ribbon as shown in FIG. Connector cable.

The crimping case 1 is composed of a cable holding member 2 made of an insulating material and a metal shielding case 3 attached to cover the outer surface of the cable holding member 2 . On the cable holding member 2, there are formed a plurality of U-shaped cable holding grooves 2a, 2b, and the plurality of cable holding grooves 2a, 2b are arranged at the same pitch as the coaxial cables 20 of the above-mentioned flat cable FC. . In the cable holding member 2, crimp terminal receiving grooves 2c and ground terminal receiving holes 2d are also formed as shown in the figure. Then, each crimping portion 22a of flat cable FC is accommodated in these cable holding grooves 2a, 2b, and the front end portion of flat cable FC is attached to crimping cover 1 as shown in FIG. 4 .

The connector body 5 includes: a contact holding member 6 made of an insulating material; a grounding plate 7 made of a metal plate that covers the underside of the contact holding member 6 and is installed integrally; A plurality of contacts 8 are maintained. The contacts 8 are arranged at the same pitch as the coaxial cables 20 of the flat cable FC, and their rear ends are bent upward at right angles to form crimp terminal portions 8a. A core wire receiving groove 8 b opening upward and having a width smaller than the diameter of the core wire 21 of the coaxial cable 20 is formed in the crimp terminal portion 8 a. Also formed at the rear end of the ground plate 7 is a ground terminal receiving portion 7a bent upward at right angles, and a shield receiving groove 7b opening upward and having a width smaller than the diameter of the shield layer 23 of the coaxial cable 20 is formed here.

As described above, each crimping portion 22a of the flat cable FC is accommodated in the cable holding grooves 2a, 2b and installed on the crimping cover 1, and the crimping cover 1 is moved toward the connector body 5, that is, in the direction of the arrow A. When pushing, the crimping terminal part 8a bites into the crimping part 22a while cutting the inner peripheral side insulation coating layer 22 of the crimping part 22a, inserts the core wire 21 into the core wire receiving groove 8b, and connects the core wire 21 corresponding to the contacts 8 for electrical connection. At the same time, the ground connection portion 23a is accommodated and held in the shield accommodation groove 7b of the ground terminal accommodation portion 7a. Next, as shown by the arrow B in FIG. 6 , the shield case 3 is pushed in so that the front end portion 3 a comes into contact with the upper surface of the ground connection portion 23 a and is pressed downward. Thereby, the whole of the ground connection part 23a, the front end part 3a, and the shield accommodation groove 7b supporting the pressing of the front end part 3a is electrically connected. In addition, at this time, the front end of the crimping terminal portion 8a enters into the crimping terminal accommodating groove 2c, and the front end of the ground terminal accommodating portion 7a enters into the ground terminal accommodating hole 2d.

[Example 2]

In FIG. 3(B) of Embodiment 1, an example in which the ground connection portion 23a is exposed on the upper surface of the outer peripheral insulating coating layer 24 of the coaxial cable 20 is shown, but as shown in FIG. The structure in which the portion 23a is exposed both above and below. As the feature of the coaxial cable 20 of the structure shown in FIG. 7 , the following example can be cited: through the two setting connection parts of the upper ground connection part 23b and the lower setting connection part 23c, the ground plate 7 and the shield case 3 are respectively connected to each other. Make electrical connections.

FIG. 8 shows a cable with a connector in which a connector is attached to the end of such a flat cable FC. The connector body 5 has the same structure as the connector body 5 of Embodiment 1, but it can be seen that it is different from the connection between the ground plate 7 and the shield 3 in the connection portions 23b, 23c of the coaxial cable 20. method. In the coaxial cable 20 with the structure shown in FIG. 7, when the ground connection parts 23b, 23c are stored and held in the shielding accommodation groove 7b of the ground terminal accommodation part 7a, the lower ground connection part 23c is pressed into contact with the shielding accommodation groove 7b, Thus, the shield layer 23 is electrically connected to the ground plate 7 . Then, as shown by arrow B in FIG. 8 , the shield case 3 is pushed in so that the front end portion 3 a comes into contact with the upper surface ground connection portion 23 b, and is pressed downward. In this way, the contact state between the shield receiving groove 7b and the shield layer 23 can be stabilized by making the two surfaces of the upper connecting portion 23a and the lower connecting portion 23b respectively correspond to the connection between the ground plate 7 and the shield case 3 .

Claims (3)

1. a flat cable is many coaxial cables to be arranged in parallel be held in the same plane flat cable that forms,

Described coaxial cable comprises: the heart yearn that linearity is extended coats the insulation-coated layer of the interior all sides that are provided with; Coat the set screen of periphery of the insulation-coated layer of described interior all sides; And the set insulation-coated layer of outer circumferential side of the periphery that coats described screen, it is characterized in that,

End at described coaxial cable, in the scope of the 1st specific length of front end, insulation-coated layer of described outer circumferential side and described screen peelled off make described in insulation-coated layer of all sides expose and be formed with pressure contact portion, in scope from the 2nd inner specific length of described pressure contact portion, under the situation of the insulation-coated layer of the circular outer periphery side of the Rack that leaves outer circumferential side side insulation coating and front, the insulation-coated layer of described outer circumferential side is partly peelled off and is formed with the ground connection connecting portion, and the described outer circumferential side side insulation coating that leaves is with insulation-coated layer of the described circular outer periphery side that leaves and whole connection of the insulation-coated layer of described outer circumferential side.

2. flat cable as claimed in claim 1 is characterized in that,

Described many coaxial cables utilize retainer belt to be arranged in parallel to be held in same plane and form flat cable,

The end of described coaxial cable is outstanding to foreign side from the end of described retainer belt, is formed with described pressure contact portion and described ground connection connecting portion in the end of outstanding so described coaxial cable.

3. flat cable as claimed in claim 1 is characterized in that,

In the position that is described the 1st specific length from described coaxial cable front end, utilize YAG laser that insulation-coated layer of described outer circumferential side and described screen are cut off, pull out insulation-coated layer of the described outer circumferential side that is positioned at described the 1st specific length scope and described screen, make described interior all sides expose and form described pressure contact portion for insulation-coated layer

In the 2nd inner specific length of described pressure contact portion, irradiation CO ₂Laser but stays the insulation-coated layer of the outer circumferential side of front Rack so that described screen exposes, and the insulation-coated layer segment fusion of described outer circumferential side is removed and forms described ground connection connecting portion.

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