JP2014212078A - Shield terminal for coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield terminal for coaxial cable that can be crimped to a braid exposure part while correcting ravel of the braid even if the braid gets raveled and also can prevent a core wire and the braid from short-circuiting.SOLUTION: There is provided a shield terminal 10 for coaxial cable which is connected to a terminal part of a coaxial cable W including a core wire Wa, an insulator Wb which covers an outer periphery of the core wire, a braid Wc which covers an outer periphery of the insulator, and an outer coating Wd which covers an outer periphery of the braid. The shield terminal 10 for coaxial cable has a braid crimped part 12 crimped to a braid exposure part WC which has the braid exposed by removing the outer coating, and the braid crimped part is provided with a braid ravel correction part 15 which is formed into a cylinder having an inner diameter a little larger than the outer diameter of the braid exposure part, and stops a braid ravel part formed at the braid exposure part from passing through when the terminal part of the coaxial cable is inserted inside in an axial direction for crimping.

Description

  The present invention relates to a shield terminal for a coaxial cable provided with a braided crimping portion that is crimped and connected to a braided coaxial cable.

  A coaxial cable used for high-frequency signal transmission such as an antenna wire generally includes a core wire as a central conductor, an insulator as a dielectric covering the outer periphery of the core wire, and a braid as an outer conductor covering the outer periphery of the dielectric. And an outer skin (also referred to as an insulating sheath) covering the outer periphery of the braid, in order from the center to the outer side.

  A coaxial connector is attached to the terminal portion of the coaxial cable having such a configuration in order to connect to a counterpart device or a coaxial cable. The coaxial connector is designed to cut off electrical noise such as electromagnetic waves and static electricity by connecting the inner terminal for connecting the core wire to the center conductor of the counterpart coaxial connector and the braid that is the outer conductor to the counterpart coaxial connector. And a shield terminal.

  4 (a) to 4 (d) are process explanatory views when the inner terminal is crimped to the end portion of the coaxial cable, and FIGS. 5 (a) and 5 (b) are coaxial cable ends with the inner terminal crimped. It is process explanatory drawing at the time of crimping | bonding a shield terminal to the braided exposed part.

  4A, the coaxial cable W includes a core wire Wa, an insulator Wb that covers the outer periphery of the core wire Wa, a braid Wc that covers the outer periphery of the insulator Wb, and a skin Wd that covers the outer periphery of the braid Wc. It is equipped with. When a coaxial connector is attached to the end portion of the coaxial cable W, first, as shown in FIG. 4A, the outer sheath Wd, the braid Wc, and the insulator Wb are removed from the cable end portion in order from the front end side. A core wire exposed portion WA exposing the core wire Wa, an insulator exposed portion WB exposing the insulator Wb by removing the outer skin Wd and the braid Wc, and a braid exposing the braid Wc by removing the outer skin Wd An exposed portion WC. At this time, generally, as shown in FIG. 4B, the braid Wc that has been exposed by removing the outer skin Wd is folded back and covered with the outer skin Wd, so that the portion covered with the braid Wc is exposed to the braid exposed portion WC. It is said.

  Then, as shown in FIGS. 4C and 4D, the core wire crimping portion 52 of the inner terminal 50 of the coaxial connector is crimped to the core wire exposed portion WA. Up to this point, the installation of the inner terminal 50 is completed, and then the process moves to the installation of the shield terminal.

  As shown in FIG. 5A, the shield terminal 110 has a terminal main body 111 connected to the shield member of the counterpart coaxial connector at the front, and is crimped to the braided exposed portion WC at the rear. And a braided crimping portion 112. The braided crimping portion 112 is formed in a U-shaped cross section having a bottom plate 112a on which the braided exposed portion WC is placed and a pair of braided caulking pieces 112b and 112c extending from both sides in the width direction of the bottom plate 112a. In order to crimp the braided crimping portion 112 to the braided exposed portion WC, the inner terminal 50 is inserted into the terminal body 111 of the shield terminal 110 while the braided crimping portion 112 is inserted as shown in FIG. The braided exposed portion WC is placed on the bottom plate 112a. In this state, as shown in FIG. 5B, the shield terminal 110 is attached to the end portion of the coaxial cable W by rounding and crimping a pair of braided caulking pieces 112 b and 112 c in order. .

  A conventional example of a shield terminal having such a configuration is described in Patent Document 1.

JP 2012-221661 A

  By the way, since the braid Wc is formed by knitting a large number of thin wires, a frayed portion of the braid Wc (hereinafter referred to as a braid frayed portion Wcp) may occur in the braid exposed portion WC as shown in FIG. . In particular, when the braid Wc is folded and put on the outer skin Wd, the braid frayed portion Wcp may occur. When such a braided frayed portion Wcp occurs, when the coaxial connector is attached, the braided frayed portion Wcp and the core wire Wa or the inner terminal 50 may come into contact with each other, and the braided Wc and the core wire Wa may be short-circuited.

  The present invention has been made in view of the above-described circumstances, and its purpose is to be able to crimp the braid to the exposed portion of the braid while correcting the fray of the braid, It is another object of the present invention to provide a shield terminal for a coaxial cable that can prevent a short in a braid.

In order to achieve the above-described object, a shield terminal for a coaxial cable according to the present invention is characterized by the following (1) to (3).
(1) For a coaxial cable connected to a terminal portion of a coaxial cable provided with a core wire, an insulator covering the outer periphery of the core wire, a braid covering the outer periphery of the insulator, and an outer skin covering the outer periphery of the braid Shield terminal of
A braided crimping portion that is crimped so as to wrap the braided exposed portion from the outside to a braided exposed portion that exposes the braid by removing the outer sheath of the end portion of the coaxial cable;
The braided crimping portion is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the braided exposed portion, and when the end of the coaxial cable is inserted in the axial direction for crimping, the braided It has a braid fray correcting part which prevents passage of the braid fray generated in the exposed part.
(2) A shield terminal for a coaxial cable configured as described in (1) above,
The braided exposed portion is a portion where the outer skin of the end portion of the coaxial cable is removed to expose the braid, and the exposed braid is folded and covered with the outer skin,
The inner diameter of the braided fray correcting part formed in the cylindrical shape is set corresponding to the outer diameter of the braided exposed part covered on the outer skin,
about.
(3) A shield terminal for a coaxial cable configured as described in (1) or (2) above,
The braided crimping portion before crimping is formed in a U-shaped cross section having a bottom plate on which the braided exposed portion is placed and a pair of braided crimping pieces extending from both sides in the width direction of the bottom plate,
The braided fray correcting portion is formed on the bottom plate by cutting and raising a part of the bottom plate and the braided crimped piece and rounding it into a cylindrical shape.
about.

According to the shield terminal configured as described in (1) above, the braided frayed portion is generated in the braided exposed portion by inserting the end portion of the coaxial cable into the tubular braided fray correcting portion during crimping. However, the braided frayed portion can be forcibly corrected by the braided frayed portion being caught by the braided frayed correcting portion. Accordingly, it is possible to eliminate the possibility that the braided frayed portion comes into contact with the core wire or the inner terminal, and it is possible to prevent a short circuit between the core wire and the braid.
According to the shield terminal configured as described in (2) above, the inner diameter of the braided fray correcting portion is set in accordance with the outer diameter of the braided exposed portion which is folded over the outer skin and is generated when the braid is folded back. The braided frayed portion can be reliably corrected.
According to the shield terminal having the configuration of (3) above, the braided fray correcting part is formed by cutting and raising a part of the bottom plate and the braided caulking piece and rounding it into a cylindrical shape. Unlike manufacturing and attaching to the braided crimping part, it can be manufactured easily. In addition, the braided fray correcting part is formed on the bottom plate of the braided crimping part, so the braided frayed part can be simplified simply by inserting the end of the coaxial cable into the cylindrical braided fray correcting part along the upper surface of the bottom plate. Can be corrected. In addition, by inserting the end portion of the coaxial cable into the braided fray correcting part, the braided exposed part can be placed on the upper surface of the bottom plate, so in that state, just by crimping a pair of braided caulking pieces, A braided crimping portion can be crimped and connected to the braided exposed portion.

  According to the present invention, even if a braided frayed portion is generated, the shield terminal can be crimped to the braided exposed portion while correcting the frayed braided portion, and a short circuit between the core wire and the braided can be prevented.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1A to FIG. 1C are configuration diagrams of a shield terminal according to an embodiment of the present invention, FIG. 1A is a perspective view, and FIG. 1B is Ib-Ib in FIG. 1C is a cross-sectional view taken along the arrow Ic-Ic in FIG. FIG. 2A to FIG. 2C are process explanatory views when the shield terminal of the embodiment of the present invention is crimped to the end portion of the coaxial cable to which the inner terminal is attached. 3 (a) and 3 (b) are diagrams showing a modified example of the shield terminal according to the embodiment of the present invention. FIG. 3 (a) is a developed view, and FIG. 3 (b) is an exposed braid of the coaxial cable. FIG. 3C is a side view showing a state in which only the terminal is shown without showing the configuration of the cable side when crimped and connected to the part, and FIG. 3C is a cross-sectional view taken along the line IIIc-IIIc in FIG. FIG. 4A to FIG. 4D are process explanatory diagrams when the inner terminal is crimped to the terminal portion of the coaxial cable. FIG. 5A and FIG. 5B are process explanatory views when a conventional shield terminal is crimped to the braided exposed portion of the end of the coaxial cable to which the inner terminal is crimped. FIG. 6 is a side view showing a state in which a braided fraying portion is generated in the terminal processing portion of the coaxial connector.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a configuration diagram of a shield terminal according to the embodiment, FIG. 1A is a perspective view, FIG. 1B is a cross-sectional view taken along the arrow Ib-Ib in FIG. 1A, and FIG. FIGS. 2A to 2C are cross-sectional views taken along the line Ic-Ic in FIG. 2B, when the shield terminal of the embodiment of the present invention is crimped to the end portion of the coaxial cable to which the inner terminal is attached. It is process explanatory drawing of.

  The shield terminal 10 according to the embodiment shown in FIGS. 1A to 1C constitutes the coaxial connector 1 together with the inner terminal 50 as shown in FIG. It is crimped and connected to the braided exposed portion WC of the processing unit. A dielectric material (not shown) may be interposed between the shield terminal 10 and the inner terminal 50.

  2A, the coaxial cable W includes a core wire Wa, an insulator Wb that covers the outer periphery of the core wire Wa, a braid Wc that covers the outer periphery of the insulator Wb, and a skin Wd that covers the outer periphery of the braid Wc. Are arranged in the order of the core wire Wa, the insulator Wb, the braid Wc, and the outer skin Wd from the center toward the outside. In order from the distal end side, the cable end portion is formed by removing the outer sheath Wd, the braid Wc, and the insulator Wb to expose the core wire Wa, and removing the outer sheath Wd and the braid Wc to provide the insulator Wb. An exposed insulator exposed portion WB and a braided exposed portion WC which is formed by removing the outer skin Wd to expose the braid Wc and folding back the exposed braid Wc to cover the outer skin Wd are formed. A pin-shaped inner terminal 50 is attached to the core wire exposed portion WA.

  On the other hand, as shown in FIGS. 1 (a) to 1 (c), the shield terminal 10 is formed by press-molding a single metal plate 13, and has a rectangular tubular terminal body 11 at the front portion. And a braided crimping part 12 at the rear part. The braid crimping portion 12 is a portion that is crimped to the braided exposed portion WC of the coaxial cable W so as to wrap the braided exposed portion WC from the outside. Since the braid crimping portion 12 is crimped to a portion where the braid Wc is covered with the outer skin Wd, it also functions as an outer crimping portion for caulking the outer skin.

  The braided crimping portion 12 before crimping is formed in a U-shaped cross section having a bottom plate 12a on which the braided exposed portion WC is placed and a pair of braided crimping pieces 12b, 12c extending from both sides in the width direction of the bottom plate 12a. Has been. The braided crimping portion 12 has an outer diameter of a braided exposed portion WC (a portion where the outer sheath Wd of the end portion of the coaxial cable W is removed to expose the braided Wc and the exposed braided Wc is folded and covered with the outer sheath Wd). Also, a cylindrical braid fray correcting portion 15 having a slightly larger inner diameter is provided.

  The braided fray correcting part 15 prevents passage of the braided frayed part Wcp (see FIG. 5) generated in the braided exposed part WC when the end of the coaxial cable W is inserted in the axial direction for crimping. Thus, it is a part that performs the function of forcibly correcting fraying of the braid Wc. The braided fray correcting portion 15 has a notch 14 formed in a part of the metal plate 13 constituting the bottom plate 12a and the braided caulking pieces 12b and 12c, and causes the inside of the notch 14 to be rounded into a cylindrical shape. Formed on top.

  Specifically, a long U-shaped cut 14 is made in a direction perpendicular to the axial direction in the metal plate 13 constituting the braided crimping portion 12. This notch 14 is located at the boundary between the bottom plate 12a of one braided caulking piece 12b and the bottom plate 12a of the other braided caulking piece 12c. To a position close to (the vicinity of the base end of the other braided crimping piece 12c). Then, with the connecting portion 15a having no cut as a fulcrum, the inner portion of the U-shaped cut 14 is raised above the bottom plate 12a, and the raised portion is rolled downward from the tip side to form a cylinder. Thus, a braided fray correcting part 15 is formed which is an insertion hole 16 whose inside penetrates in the axial direction. Further, the inner diameter of the braided fray correcting portion 15 is set to be slightly larger than the outer diameter of the braided exposed portion WC. Further, as shown in FIG. 1 (c), the lower end of the braid fray correcting part 15 is accommodated in the space formed by the notch 14, so that the inner periphery of the lower end of the braid fray correcting part 15 is the upper surface of the bottom plate 12a. It is the same.

  When this shield terminal 10 is used, the inner terminal 50 is first crimped to the core wire exposed portion WA of the terminal processing portion of the coaxial cable W as described above with reference to FIGS. 4 (a) to 4 (d). To do. Next, as shown in FIG. 2 (a), the inner terminal 50 of the terminal portion of the coaxial cable W is inserted into the braided fray correcting portion 15 of the shield terminal 10 as shown by the arrow A from the axial direction. As shown in (b), the braided exposed portion WC is inserted into the tubular braided fray correcting portion 15.

  At this time, even if the braided frayed portion Wcp (see FIG. 5) is generated in the braided exposed portion WC, the braided frayed portion Wcp is connected to the braided frayed correcting portion 15 by a two-dot chain line in FIG. It catches at the position shown by C. Accordingly, by inserting the inner terminal 50 to a fixed position while further inserting the braided exposed portion WC into the braided fray correcting unit 15, the braided fray correcting unit 15 prevents the braided frayed portion Wcp from passing, and the braided frayed portion Wcp. Can be forcibly corrected. After that, as shown in FIG. 2 (c), the braid crimping pieces 12b and 12c are rounded inward in order, and the braid crimping portion 12 is then connected to the braid exposed portion WC via the braid fraying correction portion 15. Crimp connection is possible.

  As described above, when the braided fraying portion WC is inserted into the braided fraying correction portion 15, even if there is a braided fraying portion Wcp, it can be corrected. Therefore, the braided fraying portion Wcp is connected to the core wire Wa or the inner terminal. 50 can be eliminated, and a short circuit between the core wire Wa and the braid Wc can be prevented.

  In this case, since the inner diameter of the braid fray correcting part 15 is set corresponding to the outer diameter of the braid exposed portion WC that is folded over the braid Wc and covered with the outer skin Wd, the braid frayed part Wcp generated when the braid Wc is folded back. Can be reliably corrected.

  Further, since the braid fray correcting part 15 is formed by cutting and raising a part of the metal plate 13 constituting the braid crimping part 12 and rounding it into a cylindrical shape, the braid fray correcting part 15 is separately manufactured and braided. Unlike attaching to the crimping part 12, it can be manufactured easily. Further, since the braid fray correcting part 15 is formed on the bottom plate 12a of the braid crimping part 12, only the end of the coaxial cable W is inserted into the cylindrical braid fray correcting part 15 along the upper surface of the bottom plate 12a. The braided frayed portion Wcp can be easily corrected. Further, since the braided exposed portion WC can be placed on the upper surface of the bottom plate 12a by inserting the end portion of the coaxial cable W into the braided fray correcting portion 15, a pair of braided caulking pieces 12b, 12c in that state. Can be crimped and connected to the braided exposed portion WC.

  3 (a) to 3 (c) are views showing modifications of the shield terminal according to the embodiment of the present invention, FIG. 3 (a) is a developed view, and FIG. 3 (b) is a braided exposed portion of the coaxial cable. FIG. 3C is a cross-sectional view taken along the arrow IIIc-IIIc in FIG. 3B, illustrating a state in which the configuration of the cable side when crimping is connected to is omitted and only the terminals are illustrated.

  In the shield terminal 10A of this modified example shown in FIGS. 3B and 3C, as shown in the development view of FIG. 3A, a U-shaped cut 14 for making a braided fray correcting portion 15 is provided. However, it extends long from the vicinity of the tip of one braided caulking piece 12b to the vicinity of the tip of the other braided caulking piece 12c. The length dimension up to the tip of the braided caulking piece 12c is set larger than that in the embodiment of FIG. In this way, by changing the length of the cut 14, it is possible to change the size of the insertion hole 16 of the braid fray correcting part 15 by changing the circumferential length of the braid fray correcting part 15. Other functions and effects are the same as those of the shield terminal 10 of the embodiment shown in FIGS. 1 and 2.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above-described embodiment, the case where the tubular braid fray correcting part 15 is formed by cutting and raising a part of the metal plate body 13 constituting the braid crimping part 12 is shown. However, the tubular braid fray correcting part is corrected. It is also possible to manufacture the part 15 separately and attach it on the bottom plate 12a of the braided crimping part 12 by bonding.

DESCRIPTION OF SYMBOLS 1 Coaxial connector 10,10A Shield terminal 12 Braid crimping part 12a Bottom plate 12b, 12c Braid caulking part 13 Metal plate 14 Cutting 15 Braid fraying correction part W Coaxial cable Wa Core wire WA Core wire exposed part Wb Insulator Wc Braid exposed part Wd skin

Claims (3)

A shield terminal for a coaxial cable connected to a terminal portion of a coaxial cable, comprising: a core wire; an insulator covering the outer periphery of the core wire; a braid covering the outer periphery of the insulator; and a sheath covering the outer periphery of the braid. Because
A braided crimping portion that is crimped so as to wrap the braided exposed portion from the outside to a braided exposed portion that exposes the braid by removing the outer sheath of the end portion of the coaxial cable;
The braided crimping portion is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the braided exposed portion, and when the end of the coaxial cable is inserted in the axial direction for crimping, the braided A shield terminal for a coaxial cable, comprising: a braided fray correcting portion that prevents passage of the braided frayed portion generated in the exposed portion. The braided exposed portion is a portion where the outer skin of the end portion of the coaxial cable is removed to expose the braid, and the exposed braid is folded and covered with the outer skin,
The inner diameter of the braided fray correcting part formed in the cylindrical shape is set corresponding to the outer diameter of the braided exposed part covered on the outer skin,
The shield terminal for a coaxial cable according to claim 1. The braided crimping portion before crimping is formed in a U-shaped cross section having a bottom plate on which the braided exposed portion is placed and a pair of braided crimping pieces extending from both sides in the width direction of the bottom plate,
The braided fray correcting portion is formed on the bottom plate by cutting and raising a part of the bottom plate and the braided crimped piece and rounding it into a cylindrical shape.
The shield terminal for a coaxial cable according to claim 1 or 2.

Images