CN114824854B - Terminal and method for connecting terminal and cable - Google Patents

Terminal and method for connecting terminal and cable Download PDF

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Publication number
CN114824854B
CN114824854B CN202210101360.5A CN202210101360A CN114824854B CN 114824854 B CN114824854 B CN 114824854B CN 202210101360 A CN202210101360 A CN 202210101360A CN 114824854 B CN114824854 B CN 114824854B
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CN
China
Prior art keywords
core wire
terminal
cable
state
crimping
Prior art date
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Active
Application number
CN202210101360.5A
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Chinese (zh)
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CN114824854A (en
Inventor
和田真人
高桥谦介
山中和之
国眼幸治
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JST Mfg Co Ltd
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JST Mfg Co Ltd
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Publication date
Application filed by JST Mfg Co Ltd filed Critical JST Mfg Co Ltd
Publication of CN114824854A publication Critical patent/CN114824854A/en
Application granted granted Critical
Publication of CN114824854B publication Critical patent/CN114824854B/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/56—Means for preventing chafing or fracture of flexible leads at outlet from coupling part
    • H01R13/562—Bending-relieving
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
    • H01R4/184—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/058—Crimping mandrels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

The invention provides a terminal and a method for connecting the terminal and a cable, which can reduce the load of a core wire when the cable is bent, inhibit the damage of the core wire, inhibit the increase of the number of components and working hours for connecting the terminal and the cable, and inhibit the influence of heat added to the terminal when the cable and a connecting object are connected through the terminal on a resin component on the cable side. The terminal (2) is provided with: a connection unit (15) that is connected to the connection object (100); and a crimp part (16) integrally connected with the connection part (15) and crimped to the core wire (4) of the cable (3). The crimp part (16) has a core wire surrounding part (20) surrounding the outer periphery of the core wire (4) along the circumferential direction, and a curved surface part (22) extending in an arc shape from the inner side to the outer side of the core wire surrounding part (20) is arranged along the edge part of the core wire surrounding part (20) at a core wire leading end part (21) where the core wire (4) in a crimped state is led out and extended at the crimp part (20).

Description

Terminal and method for connecting terminal and cable
Technical Field
The present invention relates to a terminal connected to a core wire of a distal end portion of a cable and a method for connecting the terminal to the cable.
Background
Conventionally, terminals connected to core wires at the distal end of a cable have been used. As such a terminal, for example, a terminal disclosed in patent document 1 is known. Patent document 1 discloses a connection structure between a terminal and a board, in which the terminal is connected to a cable, the terminal connected to the cable is connected to the board, and the cable is bent from the terminal side. Patent document 1 discloses the following: a flexible tube made of a reinforcing resin is attached from the terminal to the bent portion of the cable, whereby the load on the core wire when the cable is bent is reduced, and the occurrence of damage to the core wire is suppressed.
The terminal disclosed in patent document 1 is configured to be pressure-bonded to a core wire, and also to a flexible tube made of resin, or to a coating portion made of resin that covers the periphery of the core wire in a cable.
Prior art literature
Patent document 1: japanese patent laid-open No. 2009-021167
Disclosure of Invention
Problems to be solved by the invention
According to the terminal disclosed in patent document 1, by attaching the reinforcing tube to the cable, the load on the core wire when the cable is bent can be reduced, and the occurrence of damage to the core wire can be suppressed. However, when the terminal disclosed in patent document 1 is connected to a cable, a flexible tube made of resin for reinforcing the cable installation is required. Therefore, the number of components in the connection structure of the terminal and the cable increases, and the number of man-hours for connecting the terminal and the cable increases. Therefore, it is desirable to reduce the load on the core wire when the cable is bent, to suppress the occurrence of core wire damage, and to suppress the increase in the number of components and man-hours for connecting the terminal to the cable.
In addition, when the terminal disclosed in patent document 1 is connected to a cable, the terminal is crimped to a core wire, and is also crimped to a flexible tube made of resin, or is crimped to a coating made of resin covering the periphery of the core wire in the cable. Therefore, when the terminals are connected to a connection object such as a substrate to which the cable is connected via the terminals by a method such as soldering, which involves heating at a high temperature, there is a problem that a resin member on the cable side such as a resin coating portion or a resin tube is likely to be melted by heat conduction from the terminals. In particular, when the terminals are connected to the connection object by soldering, if the connection by the lead-free solder is prohibited by using the lead alloy solder, the temperature of the soldering is increased, and it is desired that the heat conduction to the resin coating portion or the resin member on the cable side such as the pipe can be further suppressed. Therefore, it is desirable to reduce the load on the core wire when the cable is bent, to suppress the occurrence of core wire damage, and to suppress the influence of heat added to the terminal when the cable is connected to the connection object via the terminal, to the resin member on the cable side.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a terminal and a method for connecting a terminal to a cable, which can reduce the load of a core wire when the cable is bent, suppress damage to the core wire, suppress an increase in the number of components and man-hours for connecting the terminal to the cable, and suppress the influence of heat added to the terminal on a resin component on the cable side when the cable is connected to a connection object via the terminal.
Means for solving the problems
(1) In order to solve the above-described problems, a terminal according to an aspect of the present invention is a terminal connected to a core wire of a distal end portion of a cable, comprising: a connection unit that is connected to a connection object to which the cable is connected via the terminal; and a pressure-bonding section integrally connected to the connection section and pressure-bonded to the core wire, the pressure-bonding section having a core wire surrounding section provided so as to circumferentially surround an outer periphery of the core wire, wherein a curved surface section extending in an arc shape from an inner side to an outer side of the core wire surrounding section is provided at a core wire lead-out end section along an edge section of the core wire surrounding section, the core wire lead-out end section being an end section on an opposite side of the pressure-bonding section from the connection section, the end section being an end section on a side from which the core wire in a state of being pressure-bonded to the pressure-bonding section is led out and extended.
According to this configuration, the terminal is connected to the cable by crimping the core wire at the distal end portion of the cable to the crimp portion, and the cable and the connection object are connected via the terminal by connecting the connection portion to which the terminal of the cable is connected to the connection object. The core wire of the cable is crimped to the crimp portion of the terminal in a state where the outer periphery is surrounded by the core wire surrounding portion, and is led out from the crimp portion in a state where the core wire extends along a curved surface portion provided along an edge portion of a core wire leading-out end portion led out from the crimp portion and extending in an arc shape from the inside to the outside of the core wire surrounding portion. Therefore, the load is suppressed from being locally concentrated on the core wire of the cable at the edge portion of the pressure-bonding section, and the core wire is supported in a state where the load is dispersed in the curved surface portion of the core wire lead-out end portion. This reduces the load on the core wire when the cable is bent, and suppresses the damage to the core wire.
In addition, according to the above configuration, the load of the core wire at the time of bending the cable can be reduced to suppress the damage of the core wire, and the distal end portion of the cable can be connected to the terminal only by crimping the core wire to the crimp portion of the terminal. Therefore, there is no need to provide a separate reinforcing member as disclosed in patent document 1. That is, there is no need to provide a separate reinforcing member for reducing the load on the core wire when the cable is bent and suppressing the damage to the core wire. Therefore, according to the above configuration, the load of the core wire when the cable is bent can be reduced, the damage of the core wire can be suppressed, and the number of components for connecting the terminal and the cable and the number of man-hours can be suppressed.
In addition, according to the above configuration, the distal end portion of the cable is connected to the terminal only by crimping the core wire to the crimp portion of the terminal. That is, the terminal is press-bonded only to the core wire of the cable, and is not press-bonded to the resin coating portion in the cable. In addition, according to the above configuration, since the reinforcing resin member is not separately provided, the reinforcing resin member is not pressure-bonded to the reinforcing resin member. Therefore, even when the terminal connected to the cable is connected to the connection object by a method such as soldering accompanied by heating at high temperature, heat from the terminal is not directly transmitted to the resin member on the cable side such as the coating portion of the cable. This can suppress the influence of heat added to the terminal when the cable is connected to the connection object via the terminal on the resin member on the cable side.
Therefore, according to this structure, it is possible to provide a terminal capable of reducing the load on the core wire when the cable is bent, suppressing the damage to the core wire, suppressing the increase in the number of components and man-hours for connecting the terminal to the cable, and suppressing the influence of heat added to the terminal when the cable is connected to the connection object via the terminal on the resin component on the cable side.
In addition, when the connection object is a substrate, that is, when the cable is connected to the substrate via the terminal, the terminal to which the cable is connected may be connected in a substantially vertical posture with respect to the substrate, and may be mounted on the substrate. In this case, when the length of the terminal is increased, the height of the terminal protruding vertically from the substrate is increased, and the mounting height of the terminal with respect to the substrate is increased. When the mounting height of the terminals with respect to the substrate becomes high, an increase in the installation space of the substrate is caused. However, according to the above configuration, the terminal is press-bonded only to the core wire of the cable, and is not press-bonded to the resin coating portion in the cable. This can shorten the length of the crimp portion of the terminal compared with the terminal crimped to both the core wire and the coating portion of the cable. Therefore, according to the above configuration, the height of the terminal protruding vertically from the substrate can be reduced, and the mounting height of the terminal with respect to the substrate can be reduced.
(2) The curved surface portion may be provided as a surface of a folded portion formed by folding and overlapping a plate-like portion constituting the core wire surrounding portion at the core wire leading end portion, and may be provided to extend in a semicircular shape from the inside to the outside of the core wire surrounding portion.
According to this structure, by providing the portion folded back and overlapped at the core wire leading end portion, the curved surface portion extending in a semicircular shape from the inside to the outside of the core wire surrounding portion can be easily formed. Further, since the curved surface portion provided along the edge portion of the core wire leading end portion and extending in an arc shape from the inside to the outside of the core wire surrounding portion is provided in a semicircular shape, even when the bending angle of the cable is large, the load of the core wire at the time of bending the cable can be reduced and the damage of the core wire can be suppressed.
(3) The curved surface portion may be provided as a surface of a folded portion formed by folding the plate-like portion from the inside toward the outside of the core wire surrounding portion at the core wire leading end portion so as to overlap.
According to this structure, the plate-like portion is provided at the core wire leading end portion in a state of being folded back from the inner side toward the outer side of the core wire surrounding portion so as to overlap. Therefore, the core wire which is drawn out and extended from the inside to the outside of the core wire surrounding portion is arranged and drawn out so as to extend more smoothly along the curved surface portion. Therefore, the load is further suppressed from being locally concentrated on the core wire of the cable at the edge portion of the pressure-bonding section, and the core wire is supported in a state where the load is further dispersed to the curved surface portion of the core wire leading end portion. This can further reduce the load on the core wire when the cable is bent, and further suppress the damage to the core wire.
(4) The connection object may be a substrate, and the connection portion may be provided in a tubular shape covering the core wire from outside, and may be configured to be soldered to the substrate while being inserted into a through hole provided in the substrate.
According to this configuration, in the terminal for connecting the substrate and the cable, the load of the core wire at the time of bending the cable can be reduced to suppress the damage of the core wire, the number of components for connecting the terminal and the cable and the number of man-hours can be suppressed from increasing, and the influence of heat added to the terminal at the time of connecting the cable and the substrate via the terminal on the resin component on the cable side can be suppressed.
In addition, according to the above configuration, the connection portion connected to the substrate is provided in a cylindrical shape covering the core wire, and the cylindrical connection portion is configured to be soldered in a state of being inserted into the through hole of the substrate. Therefore, by making the inner diameter of the through hole slightly larger than the outer diameter of the cylindrical connecting portion, the clearance between the connecting portion and the through hole can be reduced in a state where the terminal is inserted into the through hole of the substrate. Alternatively, according to this configuration, when the tubular connecting portion is configured to be elastically deformable and reduced in diameter when an external force directed radially inward from the outer periphery is applied, the inner diameter of the through hole can be made the same as the outer diameter of the tubular connecting portion, or can be made slightly smaller than the outer diameter of the tubular connecting portion. By setting the inner diameter of the through hole and the outer diameter of the tubular connecting portion in this manner, the gap between the connecting portion and the through hole can be made extremely small in a state where the terminal is inserted into the through hole of the substrate. Accordingly, the terminal is not likely to be greatly inclined with respect to the substrate in a state before the terminal is inserted into the through hole of the substrate and the core wire is soldered to the substrate. This makes it possible to solder the core wire and the substrate while maintaining the cable substantially perpendicular to the substrate.
In addition, according to the above configuration, the inner diameter of the through hole is made slightly larger than the outer diameter of the cylindrical connecting portion, so that the gap between the connecting portion and the through hole can be reduced in a state where the terminal is inserted into the through hole of the substrate. Alternatively, according to the above configuration, when the tubular connecting portion is elastically deformable and is reduced in diameter, the clearance between the connecting portion and the through hole can be made extremely small in a state in which the terminal is inserted into the through hole of the substrate, by making the inner diameter of the through hole the same as the outer diameter of the tubular connecting portion or making the inner diameter of the through hole slightly smaller than the outer diameter of the tubular connecting portion. Then, when the substrate and the core wire are soldered, the molten solder is easily sucked into the gap by capillary phenomenon. This ensures that the amount of solder that reaches between the substrate and the core wire is ensured.
(5) In order to solve the above problems, a method for connecting a terminal and a cable according to an aspect of the present invention connects the terminal and the cable according to an aspect of the present invention. The method for connecting a terminal to a cable according to one aspect of the present invention includes the steps of: a blanking step of blanking a blank of the terminal from a plate-like metal member; a folding-back step of forming the core wire leading-out end portion provided with the curved surface portion by folding back an edge portion of a press-contact portion blank portion that is a blank portion of the press-contact portion; a core wire arrangement step of arranging the core wire of the distal end portion of the cable to the crimp portion in a state before the core wire is crimped, the crimp portion being formed by bending the crimp portion blank portion; and a crimping step of clamping and pressing the crimp part blank part on which the core wire is arranged by using a crimp part die having an upper tooth die and a lower tooth die, thereby bringing the core wire into a state of being crimped at the crimp part.
According to this structure, after the blank of the terminal is punched out from the plate-like metal member, the crimp portion blank portion is bent in a folded-back manner, so that the core wire leading-out end portion provided with the curved portion can be easily formed. Further, by disposing the core wire in the crimp portion blank portion and sandwiching and pressing the core wire with the upper and lower dies, the terminal can be crimped to the core wire in the crimp portion and connected to the cable. In addition, in a state where the terminal and the cable are connected by the above-described connection method, the load of the core wire when the cable is bent can be reduced by the curved surface portion of the edge portion of the pressure-bonding section, and the damage of the core wire can be suppressed. In addition, in a state where the terminal is connected to the cable by the above-described connection method, the terminal portion of the cable is connected to the terminal only by crimping the core wire to the crimp portion of the terminal. Therefore, there is no need to provide a separate reinforcing member for suppressing damage to the core wire, and the number of members for connecting the terminal to the cable and the number of man-hours can be suppressed. In the state where the terminal and the cable are connected by the above-described connection method, the terminal portion of the cable is connected to the terminal only by crimping the core wire to the crimp portion of the terminal, and therefore, the core wire is not crimped to the resin coating portion in the cable, and there is no need to provide a separate reinforcing resin member. Therefore, even when the terminal connected to the cable is connected to the connection object by a method such as soldering accompanied by heating at high temperature, heat from the terminal is not directly transmitted to the cable-side resin member such as the coating portion of the cable or the reinforcing member. This can suppress the influence of heat added to the terminal when the cable is connected to the connection object via the terminal on the resin member on the cable side.
Therefore, according to this configuration, it is possible to provide a method for connecting a terminal to a cable, which can reduce the load on the core wire when the cable is bent, suppress the damage to the core wire, suppress the increase in the number of components and man-hours for connecting the terminal to the cable, and suppress the influence of heat added to the terminal when the cable is connected to a connection object via the terminal on the resin component on the cable side.
(6) The die for crimping part may include: a first tooth mold portion which clamps and presses the core wire surrounding portion; and a second tooth mold portion which clamps and presses the core wire extraction end portion.
According to this configuration, the first and second tooth mold portions for sandwiching and pressing the core wire surrounding portion and the core wire lead-out end portion, respectively, are provided in the die for crimping portion. Therefore, it is possible to easily set the structure of the die for the crimping portion that accurately fits the difference in shape between the core wire surrounding portion that surrounds the outer periphery of the core wire and is crimped to the core wire and the core wire lead-out end portion that is provided with the curved surface portion by bending the crimping portion blank portion in a folded-back manner. Further, by sandwiching and pressing the press-fit portion preform portion on which the core wire is disposed with the press-fit portion mold having the first tooth mold portion and the second tooth mold portion, 1 pressing operation can be performed to simultaneously press the core wire surrounding portion and the core wire leading end portion, and the core wire is pressed by the press-fit portion. Therefore, in the method for connecting the terminal to the cable, which can reduce the load of the core wire when the cable is bent and suppress the damage of the core wire, the crimping of the core wire to the terminal can be easily and efficiently performed.
(7) The first and second die portions may be provided separately from each other, and the first and second die portions may be used in a state of being overlapped in the crimping step.
According to this structure, the crimping part mold is configured in a state where the first tooth mold portion and the second tooth mold portion are overlapped. Therefore, the structure of the crimping portion mold that is accurately compatible with the difference in the shape of each of the core wire surrounding portion and the core wire leading-out end portion can be set more easily. Further, since the first tooth mold portion and the second tooth mold portion can be formed and combined separately, the manufacturing of the mold for the pressure bonding portion is easy, and the degree of freedom in the design of the structure of the mold for the pressure bonding portion can be improved.
Effects of the invention
According to the present invention, it is possible to provide a terminal, a method of connecting a terminal to a cable, and a method of connecting a terminal to a cable, which can reduce the load on a core wire when the cable is bent, thereby suppressing damage to the core wire, and which can suppress an increase in the number of components and man-hours for connecting the terminal to the cable, and which can suppress the influence of heat added to the terminal when the cable is connected to a connection object via the terminal on a resin component on the cable side.
Drawings
Fig. 1 (a) and (B) are perspective views showing a state in which a terminal according to an embodiment of the present invention is connected to a core wire of a cable.
Fig. 2 (a) is a plan view of the terminal shown in fig. 1 (a), and fig. 2 (B) is a side view of the terminal shown in fig. 1 (a).
Fig. 3 is a diagram showing a state before the terminal shown in fig. 1 (a) and fig. 1 (B) is connected to the core wire of the distal end portion of the cable, fig. 3 (a) is a perspective view seen from the upper side, and fig. 3 (B) is a perspective view seen from the lower side.
Fig. 4 is a plan view showing a state before the terminals shown in fig. 1 (a) and 1 (B) are separated from the carrier.
Fig. 5 is a diagram showing a state in which a terminal connected to a core wire of a cable is inserted into a through hole of a substrate, fig. 5 (a) is a diagram showing a state before insertion, fig. 5 (B) is a diagram showing a state in the middle of insertion, and fig. 5 (C) is a diagram showing a state after insertion.
Fig. 6 is a diagram showing a state in which the terminal in the state shown in fig. 5 (C) is soldered to the substrate.
Fig. 7 is a flowchart for explaining an example of a method of connecting a terminal to a cable according to an embodiment of the present invention.
Fig. 8 (a) and 8 (B) are diagrams for explaining a punching process and a folding process in the method of connecting the terminal and the cable shown in fig. 7, fig. 8 (a) is a diagram for explaining the punching process, and fig. 8 (B) is a diagram for explaining the folding process.
Fig. 9 is a diagram for explaining a bending process in the method of connecting the terminal and the cable shown in fig. 7, and is a diagram showing the terminal in a state of being connected to the carrier, fig. 9 (a) is a plan view, fig. 9 (B) is a side view, and fig. 9 (C) is a front view.
Fig. 10 (a) and 10 (B) are diagrams for explaining a core wire arrangement step in the method of connecting the terminal and the cable shown in fig. 7, where fig. 10 (a) is a diagram showing a state before the core wire of the cable is arranged with respect to the terminal, and fig. 10 (B) is a diagram showing a state after the core wire of the cable is arranged with respect to the terminal.
Fig. 11 is a diagram for explaining a connection portion forming process and a crimping process in the connection method of the terminal and the cable shown in fig. 7, and is a perspective view showing a die unit used in the connection portion forming process and the crimping process.
Fig. 12 is a diagram for explaining a crimping process in the method for connecting the terminal and the cable shown in fig. 7, and is a diagram showing a state in which the terminal is crimped to the core wire by the crimping portion die.
Fig. 13 is a diagram showing the terminal of the first modification example, fig. 13 (a) is a perspective view showing a state before the terminal of the first modification example is connected to the core wire of the cable, and fig. 13 (B) is a perspective view showing a state in which the terminal of the first modification example is connected to the core wire of the cable and the illustration of the core wire is omitted.
Fig. 14 is a diagram showing a terminal according to a second modification example, fig. 14 (a) is a perspective view showing a state before the terminal according to the second modification example is connected to a core wire of a cable, fig. 14 (B) is a diagram showing a part of a pressure-bonding section of the terminal shown in fig. 14 (a) in an enlarged manner, and fig. 14 (C) is a perspective view showing a state in which the terminal according to the second modification example is connected to the core wire of the cable and the illustration of the core wire of the cable is omitted.
Fig. 15 is a diagram showing a terminal according to a third modification example, fig. 15 (a) is a perspective view showing a state before the terminal according to the third modification example is connected to a core wire of a cable, and fig. 15 (B) is a perspective view showing a state in which the terminal according to the third modification example is connected to the core wire of the cable and the illustration of the core wire of the cable is omitted.
Fig. 16 is a diagram showing a terminal according to a fourth modification example, fig. 16 (a) is a perspective view showing a state before the terminal according to the fourth modification example is connected to a core wire of a cable, and fig. 16 (B) is a perspective view showing a state in which the terminal according to the fourth modification example is connected to the core wire of the cable and the illustration of the core wire of the cable is omitted.
Fig. 17 is a diagram showing a terminal according to a fifth modification example, and fig. 17 (a) and 17 (B) are perspective views showing a state before the terminal according to the fifth modification example is connected to a core wire of a cable, and fig. 17 (C) is a perspective view showing a state in which the terminal according to the fifth modification example is connected to the core wire of the cable and the illustration of the core wire of the cable is omitted.
Fig. 18 is a diagram showing a terminal according to a sixth modification example, fig. 18 (a) is a side view showing a state in which the terminal according to the sixth modification example is connected to a core wire of a cable and connected to a backlight for a liquid crystal display device, and fig. 18 (B) is a front view showing a state in which the terminal according to the sixth modification example is connected to the core wire of the cable and not connected to the backlight for the liquid crystal display device.
Fig. 19 is a flowchart for explaining a method of connecting a terminal to a cable according to a modification.
Description of the reference numerals
1: a cable assembly;
2. 51, 52, 53, 54, 55, 56: a terminal;
3: a cable;
4: a core wire;
15. 62: a connection part;
16: a crimping part;
20: a core wire surrounding portion;
21: a core wire leading-out end portion;
22. 22a, 22b, 22c, 22d, 22e: a curved surface portion;
100: a substrate (connection object);
102: backlight (connection object) for liquid crystal display device.
Detailed Description
Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. The present invention is widely applicable to a terminal for electrically connecting a cable to a connection object such as a board to which the cable is connected, and a method for connecting the terminal to the cable.
Fig. 1 (a) and 1 (B) are perspective views showing a state in which the terminal 2 according to the embodiment of the present invention is connected to the core wire 4 of the cable 3. Fig. 2 (a) is a plan view of the terminal 2 shown in fig. 1 (a), and fig. 2 (B) is a side view of the terminal 2 shown in fig. 1 (a). Fig. 3 is a diagram showing a state before the terminal 2 shown in fig. 1 (a) and fig. 1 (B) is connected to the core wire 4 at the distal end portion of the cable 3, where fig. 3 (a) is a perspective view seen from the upper side, and fig. 3 (B) is a perspective view seen from the lower side. Fig. 4 is a plan view showing a state before the terminals 2 shown in fig. 1 (a) and 1 (B) are separated from the carrier 8. In fig. 3 (a), 3 (B) and 4, the terminal 2 is shown in a state before being connected to the core wire 4 of the cable 3, and in fig. 3 (a) and 3 (B), a state in which the terminal 2 is cut from the carrier 8 shown in fig. 4 is illustrated. Fig. 5 is a diagram showing a state in which the terminal 2 connected to the core wire 4 of the cable 3 is inserted into the through hole 100a of the substrate 100, fig. 5 (a) is a diagram showing a state before insertion, fig. 5 (B) is a diagram showing a state in the middle of insertion, and fig. 5 (C) is a diagram showing a state after insertion. Fig. 6 is a diagram showing a state in which the terminal 2 in the state shown in fig. 5 (C) is soldered to the substrate 100.
The terminal 2 of the present embodiment is configured as a terminal connected to the core wire 4 at the distal end portion of the cable 3. The terminal 2 is connected to the substrate 100 in a state of being connected to the core wire 4 of the cable 3. That is, in the present embodiment, a mode in which the connection object to which the cable 3 is connected via the terminal 2 is exemplified as the substrate 100.
The terminal 2 of the present embodiment is also referred to as a built-in terminal. The terminal 2 is connected to the core wire 4 at the distal end portion of the cable 3 in a state of being crimped to the core wire 4 of the cable 3 by pressing, and is inserted into the through hole 100a formed in the substrate 100. In this state, the terminal 2 and the substrate 100 are soldered, and thus the core wire 4 connected to the terminal 2 and the substrate 100 are soldered and electrically connected. That is, the cable 3 and the substrate 100 are connected via the terminal 2, and are connected by soldering. Therefore, the terminal 2 functions as a soldering member used for soldering the core wire 4 of the cable 3 and the substrate 100. In the present embodiment, the terminal 2 and the core wire 4 of the cable 3 are connected to each other, whereby the cable assembly 1 including the terminal 2 and the cable 3 connected to the terminal 2 is configured. The cable assembly 1 is connected to the substrate 100.
[ shape of terminal before connection with core wire of Cable ]
The terminal 2 is configured to be connectable to the core wire 4 at the distal end portion of the cable 3, or configured to be connected, and the terminal 2 is soldered to the substrate 100 while being inserted into the through hole 100a formed in the substrate 100. The terminal 2 is formed to have a predetermined shape by punching a plate-like metal member by press working. As shown in fig. 3 (a) and 3 (B), the terminal 2 has a central strip portion 11, a first side wall portion 12, and a second side wall portion 13, which are integrally formed.
The central strip portion 11 is a portion of the terminal 2 having the longitudinal direction L that constitutes a wall portion extending in a strip shape along the longitudinal direction L, and is provided so as to extend in a plate shape from one end portion to the other end portion of the terminal 2 in the longitudinal direction L. The central strip portion 11 is provided as a plate-like portion elongated in the longitudinal direction L, has a predetermined thickness, and has a predetermined width dimension in the width direction W of the terminal 2, which is a direction perpendicular to the longitudinal direction L of the terminal 2. In fig. 1 (a), 1 (B), 2 (a), 2 (B), 3 (a) and 3 (B), the longitudinal direction L of the terminal 2 is indicated by a two-end arrow L. In fig. 1 (a), 2 (a) and 3 (a), the width direction W of the terminal 2 is indicated by a two-end arrow W.
The first side wall portion 12 is a portion constituting a wall portion provided on one side in the width direction W of the terminal 2 with respect to the central strip portion 11. The first side wall portion 12 is provided integrally with an edge portion on one side in the width direction W of the central band portion 11, and is provided so as to extend along the longitudinal direction L, and the first side wall portion 12 is slightly inclined to one side in the width direction W. The portion between the central band portion 11 and the first side wall portion 12 is formed in a curved surface shape.
A first cutout 12a is formed in the first side wall 12. The first cutout 12a is formed at a portion on one end side in the longitudinal direction L than the central portion in the longitudinal direction L of the first side wall 12. The first cutout portion 12a is formed in the following state: the first side wall 12 is cut from the edge portion side extending along the longitudinal direction L on the opposite side of the portion integrally provided with the central band portion 11 to the portion of the first side wall 12 on the side integrally provided with the central band portion 11.
The second side wall portion 13 is a portion constituting a wall portion provided on the other side in the width direction W of the terminal 2 with respect to the central strip portion 11. The second side wall portion 13 is integrally provided at an edge portion on the other side in the width direction W of the central band portion 11, and is provided so as to extend along the longitudinal direction L, and the second side wall portion 13 is slightly inclined toward the other side in the width direction W. The portion between the central band portion 11 and the second side wall portion 13 is formed in a curved surface shape.
A second cutout portion 13a is formed in the second side wall portion 13. The second cutout portion 13a is formed at a portion on one end side in the longitudinal direction L than a central portion in the longitudinal direction L of the second side wall portion 13. The second cutout portion 13a is formed in the following state: the second side wall portion 13 is cut from an edge portion side extending in the longitudinal direction L on the opposite side of the portion integrally provided with the central band portion 11 to a portion of the second side wall portion 13 on the side integrally provided with the central band portion 11.
As shown in fig. 3 (a) and 3 (B), the terminals 2 are provided in a state before being connected to the core wires 4 of the cable 3 such that the first side wall portions 12 and the second side wall portions 13 provided on both sides in the width direction W of the central strip portion 11 are opened in an inclined manner toward both outer sides in the width direction W. The terminal 2 is configured to include the connecting portion 15, the pressure-bonding portion 16, and the connecting portion 17 by the central strip portion 11, the first side wall portion 12, and the second side wall portion 13 formed as described above.
The connection portion 15 is provided as a portion to be connected to a connection object to which the cable 3 is connected via the terminal 2. In the present embodiment, the connection object is the substrate 100. Referring to fig. 3 (a) and 3 (B), the connection portion 15 includes a first connection portion 15a, a second connection portion 15B, and a central connection portion 15 c. The first connection portion 15a is provided as a portion of the first side wall portion 12 on the other end side in the longitudinal direction L than the first cutout portion 12 a. The second connecting portion 15b is provided at a portion of the second side wall portion 13 on the other end side in the longitudinal direction L than the second cutout portion 13a. The central connection portion 15c is provided as a portion of the central band portion 11 sandwiched between the first connection portion 15a and the second connection portion 15 b. In addition, regarding the connection portion 15, in a state before connection with the cable 3, a dimension between an edge portion of the first connection portion 15a and an edge portion of the second connection portion 15b is set to be larger than an outer diameter of the core wire 4 of the cable 3 so that the core wire 4 of the cable 3 is arranged inside the connection portion 15.
The pressure-bonding section 16 is provided as a portion integrally connected to the connection section 15 and pressure-bonded to the core wire 4 of the cable 3. Referring to fig. 3 (a) and 3 (B), the pressure-bonding section 16 includes a first pressure-bonding section 16a, a second pressure-bonding section 16B, and a central pressure-bonding section 16 c. The first pressure-bonding section 16a is provided as a portion of the first side wall section 12 on one end side in the longitudinal direction L with respect to the first cutout section 12 a. The second pressure-bonding section 16b is provided at a portion of the second side wall section 13 on one end side in the longitudinal direction L than the second cutout section 13 a. The central pressure-bonding section 16c is provided as a portion of the central band-shaped section 11 sandwiched between the first pressure-bonding section 16a and the second pressure-bonding section 16 b. In addition, the size between the edge portion of the first crimp portion 16a and the edge portion of the second crimp portion 16b is set to be larger than the outer diameter of the core wire 4 of the cable 3 in a state before being crimped to the core wire 4 of the cable 3 so that the core wire 4 of the cable 3 is arranged inside the crimp portion 16.
The connecting portion 17 is a portion provided between the connecting portion 15 and the pressure-bonding section 16, and is provided to integrally connect the connecting portion 15 and the pressure-bonding section 16.
In addition, the terminal 2 has 3 spring portions 18 and 3 protruding portions 19. The spring portion 18 and the protruding portion 19 are formed in the connecting portion 15.
The 3 spring portions 18 are provided with a spring portion 18a, a spring portion 18b, and a spring portion 18c. Referring to fig. 3 (a) and 3 (B), the spring portion 18a is formed at a portion on the other end side in the longitudinal direction L of the first connecting portion 15 a. The spring portion 18b is formed at the other end portion side in the longitudinal direction L of the second connecting portion 15 b. The spring portion 18c is formed at the other end side of the central connecting portion 15c in the longitudinal direction L. The spring portions 18 are formed in a leaf spring shape by being cut and erected. The spring portions 18 are configured such that a portion on the other end side in the longitudinal direction L is provided as a fulcrum portion integrally formed with the connecting portion 15, and each spring portion 18 is elastically deformable with the fulcrum portion as a fulcrum. Each spring portion 18 is formed in a cantilever shape that expands outward of the connecting portion 15 as extending toward one end side in the longitudinal direction L.
As the 3 protruding portions 19, protruding portions 19a, 19b, and 19c are provided. Each protruding portion 19 is provided on the connecting portion 15 so as to protrude outward from the connecting portion 15. The protruding portion 19a is formed at a portion of the first connecting portion 15a on one end side in the longitudinal direction L than the spring portion 18 a. The protruding portion 19b is formed at a portion of the second connecting portion 15b on one end side in the longitudinal direction L than the spring portion 18 b. The protruding portion 19c is formed at a portion of the central connecting portion 15c on one end side in the longitudinal direction L than the spring portion 18c. The protruding portion 19a is a cut-and-raised portion formed such that the distal end portion extends toward one side in the width direction W. The protruding portion 19b is a cut-and-raised portion formed such that the distal end portion extends toward the other side in the width direction W. The protruding portion 19c is a portion formed by cutting and standing up a portion between 2 slits formed at intervals in the longitudinal direction L and extending in the width direction W toward the outside of the connecting portion 15.
[ shape of terminal in connection with core wire of Cable ]
The terminal 2 has a shape shown in fig. 1 (a), 1 (B), 2 (a) and 2 (B) in a state of being connected to the core wire 4 of the cable 3. The cable 3 is configured to have, for example, the following portions: a core wire 4 which is provided in a state of being bundled with a plurality of metal wires and is configured as a conductor; and a resin coating portion 6 that is provided with an insulating resin material and surrounds the periphery of the core wire 4. The cable 3 is provided with a core wire exposure portion 5, which is a portion where the core wire 4 is exposed to the outside by cutting and peeling off the coating portion 6 at the distal end portion of the cable 3, and is connected to the terminal 2 at the core wire exposure portion 5.
In a state where the terminal 2 is connected to the core wire 4 of the cable 3, the connection portion 15 is bent in a state where a portion of the terminal portion of the cable 3 on the distal end side of the core wire 4 at the core wire exposed portion 5 is disposed inside the connection portion 15, whereby the connection portion 15 is provided in a cylindrical shape covering the core wire 4 from outside. In the present embodiment, the connection portion 15 is provided in a cylindrical shape covering the core wire 4 over the entire periphery. Referring to fig. 1, 2, and 5 (C) and 6, the connection portion 15 is provided as a portion that is inserted into a through hole 100a provided in the substrate 100 and connected to the substrate 100. The connection portion 15 is soldered to the substrate 100 in a state of being inserted into a through hole 100a provided in the substrate 100.
In addition, in a state where the terminal 2 is connected to the core wire 4 at the distal end portion of the cable 3, 3 spring portions 18 in the connection portion 15 are arranged at intervals along the circumferential direction of the connection portion 15 provided in a cylindrical shape. The 3 protruding portions 19 are also arranged at intervals in the circumferential direction of the connecting portion 15. In a state where the terminal 2 is connected to the cable 3, the portion between the 3 spring portions 18 and the 3 protruding portions 19 in the longitudinal direction L of the connection portion 15 is disposed so as to pass through the through-hole 100a in a state where the terminal 2 is inserted into the through-hole 100a of the substrate 100. The outer diameter of the connection portion 15 connected to the core wire 4 of the cable 3 and provided in a cylindrical shape is set to be slightly smaller than the through hole 100a of the substrate 100, for example. In a state where the terminal 2 is connected to the core wire 4 of the cable 3, the core wire 4 is disposed inside the connection portion 15 over substantially the entire length in the longitudinal direction L.
The crimp portion 16 is bent in a state where a portion of the crimp portion 16 on the base end side of the core wire 4 at the core wire exposed portion 5 of the distal end portion of the cable 3 is disposed inside the crimp portion 16, whereby the crimp portion 16 is provided as a portion that is pressed against the core wire 4 to be crimped. The pressure-bonding section 16 is configured to: the core wire 4 with respect to the core wire exposed portion 5 is crimped, and the core wire 4 of the core wire exposed portion 5 is crimped at a position separated from the distal end portion of the covering portion 6 at the end portion of the cable 3.
The crimp portion 16 includes a core surrounding portion 20, and the core surrounding portion 20 is provided so as to circumferentially surround the outer periphery of the core 4 in a state where the terminal 2 is connected to the core 4 of the cable 3. The core wire surrounding portion 20 is provided so as to surround the core wire 4 in a state of extending along the longitudinal direction L of the terminal 2. The core surrounding portion 20 is pressed against the core 4 of the core exposed portion 5, and is thus formed in a flat cross-sectional shape that is in close contact with the portion of the core exposed portion 5 on the base end side.
One end portion in the longitudinal direction L of the pressure-bonding section 16 constitutes an end portion of the terminal 2, and the other end portion in the longitudinal direction L of the pressure-bonding section 16 is integrally provided with the connecting section 15 via the connecting section 17. The end portion of the crimp portion 16 on the opposite side (i.e., the end portion of the terminal 2) to the side integrally connected to the connection portion 15 is configured as a core wire lead-out end portion 21, and the core wire lead-out end portion 21 is the end portion on the side from which the core wire 4 in the state crimped to the crimp portion 16 is led out and extended.
The crimp portion 16 is provided with a curved surface portion 22 extending in an arc shape from the inside to the outside of the core wire surrounding portion 20 along the edge portion of the core wire surrounding portion 20 at the core wire leading end portion 21. That is, the curved surface portion 22 is provided as a portion formed in an arc shape in a cross section perpendicular to a circumferential direction, which is a direction along the edge portion of the core wire surrounding portion 20. In the present embodiment, the curved surface portion 22 is provided along the edge portion of the core wire surrounding portion 20 over the entire periphery thereof.
The curved surface portion 22 is formed as a surface of a folded portion 23, and the folded portion 23 is formed by arranging a plate-like portion 20a constituting the core wire surrounding portion 20 in a state folded back and overlapped at the core wire leading end portion 21. In addition, in the present embodiment, the folded-back portion 23 is provided in the following state: the plate-like portion 20a constituting the core surrounding portion 20 is folded back from the inside toward the outside of the core surrounding portion 20 by approximately 180 ° at the core lead-out end portion 21 so as to overlap in two layers. The curved surface portion 22 configured as the surface of the folded portion 23 is provided so as to extend in a semicircular shape from the inside to the outside of the core wire surrounding portion 20.
[ connection of terminal and substrate ]
The terminal 2 is connected to the substrate 100 in a state where the core wire 4 of the cable 3 is pressure-bonded thereto. That is, in a state where the cable 3 is connected to the terminal 2 to constitute the cable assembly 1, the terminal 2 of the cable assembly 1 is inserted into the through hole 100a of the substrate 100 to be connected to the substrate 100. The case where the terminal 2 of the cable assembly 1 is inserted into the through hole 100a of the substrate 100 will be described with reference to fig. 5.
When inserting the terminal 2 of the cable assembly 1 into the through hole 100a, the operator moves the cable assembly 1 toward the through hole 100a of the substrate 100 in a direction perpendicular to the substrate 100 (see fig. 5 a), and inserts the terminal 2 into the through hole 100a from the distal end portion side of the connection portion 15 (see fig. 5B). As a result, as shown in fig. 5 (B), the spring portion 18 provided in the connection portion 15 is elastically deformed inside the through hole 100a by the through hole 100 a.
When the operator moves the cable assembly 1 further in the direction perpendicular to the substrate 100 from the state shown in fig. 5 (B), the spring portion 18 passes through the through hole 100a so that the portion between the spring portion 18 and the protruding portion 19 in the connecting portion 15 reaches the through hole 100a, whereby the spring portion 18 is elastically restored to be restored (see fig. 5 (C)). At the same time, as shown in fig. 5 (C), the protruding portion 19 is in contact with the surface 100b of the substrate 100. As a result, the substrate 100 is sandwiched between the spring portion 18 and the protruding portion 19, and as a result, the terminal 2 is fixed to the substrate 100. In this state (in other words, in a state in which the terminal 2 is inserted into the through hole 100a of the substrate 100), a portion between the spring portion 18 and the protruding portion 19 in the connecting portion 15 is in a state of being penetrated into the through hole 100 a.
In a state where the connection portion 15 penetrates the substrate 100, a part of the spring portion 18 (specifically, a distal end portion of the spring portion 18 is located outside the through hole 100a when viewed from a side of the connection portion 15 protruding from the substrate 100 (viewed from a side opposite to the insertion direction of the terminal 2) in a direction perpendicular to the substrate 100. Accordingly, even if the cable assembly 1 is pulled in the direction opposite to the insertion direction of the through hole 100a, the distal end portion of the spring portion 18 is caught by the substrate 100, and therefore, the cable assembly 1 can be prevented from falling off from the substrate 100.
After the state shown in fig. 5 (C), soldering between the core wire 4 and the substrate 100 is performed. Specifically, referring to fig. 6, soldering is performed between the pads provided on the rear surface 100c of the substrate 100 and the portions of the connection portions 15 of the terminals 2 protruding from the rear surface 100c of the substrate 100 and exposed. Thereby, the molten solder is sucked into the gap between the connection portion 15 and the core wire 4 or between the plurality of metal wires constituting the core wire 4, and the bonding pad of the substrate 100 and the core wire 4 are soldered. Thereby, the solder portion 101 can be provided between the core wire 4 and the substrate 100.
Referring to fig. 6, in the terminal 2 of the present embodiment, a spring portion 18 extending in an oblique direction with respect to the rear surface 100c of the substrate 100 is disposed between a portion protruding from the substrate 100 at a portion of the terminal 2 on the distal end side of the connecting portion 15 formed in a cylindrical shape and the substrate 100. With this spring portion 18, when soldering is performed between the outer peripheral surface of the connection portion 15 and the substrate 100, solder spreads between the outer peripheral surface of the connection portion 15 and the spring portion 18 and between the spring portion 18 and the substrate 100, and therefore, as shown in fig. 6, a solder portion 101 having a desired fillet whose tip extends from the tip side of the terminal 2 toward the rear surface 100c side of the substrate 100 can be formed.
[ concerning terminals before being cut off from a carrier ]
Referring to fig. 4, the terminals 2 of the present embodiment are arranged at equal intervals in a direction parallel to the width direction W of the terminals 2 in a state before being cut from the carrier 8. In this state, if the interval between adjacent terminals 2 can be reduced as much as possible, a large number of terminals 2 can be formed from a coil material which is a strip-shaped metal member.
In this regard, the crimp portion 16 of the terminal 2 of the present embodiment is crimped to the core wire 4. In this way, for example, the length of the pressure-bonding section 16 in the width direction W can be shortened as compared with the case where the pressure-bonding section 16 is also pressure-bonded to the covering section 6 having a larger diameter than the core wire 4. In this way, in the state shown in fig. 4, the interval between adjacent terminals 2 can be reduced as compared with the case where the length in the width direction W of the pressure-bonding section 16 is longer. That is, according to the terminal 2 of the present embodiment, a large number of terminals 2 can be efficiently formed from 1 coil.
The terminal 2 is connected to the carrier 8 at the end portion on the side where the connecting portion 15 is provided in a state before being separated from the carrier 8. The end of the terminal 2 on the side where the crimp portion 16 is provided is disposed on the free end side of the terminal 2 extending in a cantilever manner from the carrier 8. The core wire lead-out end 21 of the crimp portion 16 is disposed at an end of the terminal 2 opposite to the side connected to the carrier 8. Thus, the core wire leading end portion 21 of the crimp portion 16 provided with the curved surface portion 22 can be easily formed in a state where the terminal 2 is coupled to the carrier 8.
Further, as in the terminal 2 of the present embodiment, the crimp portion 16 is provided so as to be crimped to the core wire 4 but not to be crimped to the coating portion 6, whereby melting of the coating portion during soldering, which may occur when the crimp portion 16 is crimped to the coating portion 6, can be prevented.
Further, as in the terminal 2 of the present embodiment, the crimp portion 16 to be crimped only to the core wire 4 is provided, and therefore, it is not necessary to provide a portion to be crimped to the covering portion 6 in the terminal 2. In this way, for example, in the case of crimping the terminals 2 to a plurality of types of cables, if the outer diameters of the core wires are the same, the terminals 2 of the same size can be used even if the outer diameters of the coating portions are different. In other words, according to the terminal 2 of the present embodiment, a highly versatile terminal can be provided.
[ method of connecting terminal to Cable ]
Next, a method of connecting the terminal to the cable will be described. The method of connecting a terminal and a cable according to the present embodiment (hereinafter, also simply referred to as the connection method according to the present embodiment) can be widely applied to a method of connecting a terminal and a cable. In this embodiment, a connection method of the present embodiment will be described by taking a connection method of the terminal 2 and the cable 3 as an example. Fig. 7 is a flowchart for explaining an example of a method of connecting the terminal 2 and the cable 3 according to the embodiment of the present invention.
Referring to fig. 7, the connection method of the present embodiment includes a punching step S101, a folding step S102, a cutting and raising step S103, a bending step S104, a cutting step S105, a core wire arrangement step S106, a connection portion forming step S107, and a crimping step S108.
Fig. 8 (a) and 8 (B) are diagrams for explaining the punching step S101 and the folding step S102 in the connecting method according to the present embodiment, fig. 8 (a) is a diagram for explaining the punching step S101, and fig. 8 (B) is a diagram for explaining the folding step S102.
Referring to fig. 8 (a), the punching step S101 is a step of punching out the blank 2A of the terminal 2 from a plate-like metal member. The blank 2A of the terminal 2 is formed into a portion of the terminal 2 by molding through the folding step S102, the cutting and raising step S103, and the bending step S104. As the plate-shaped metal member for blanking the blank 2A of the terminal 2, for example, a coil formed by winding a plate-shaped metal member formed in a strip shape is used. The coil-shaped coil material is drawn out and stretched, and then punched out using a press tool (not shown) configured as a die, thereby forming a blank 2A of the terminal 2. In the case of punching out the blanks 2A of the terminals 2 from the coil, the blanks 2A of the terminals 2 can be aligned in the longitudinal direction of the coil, and the blanks 2A of the terminals 2 can be efficiently formed.
When the blanks 2A of the terminals 2 are punched out of the coil material in the punching step S101, as shown in fig. 8 (a), the blanks 2A of the plurality of terminals 2 are respectively connected to the carrier 8 extending in a belt shape, and the blanks 2A of the plurality of terminals 2 are formed in a state of being aligned along the carrier 8. The terminal 2 is provided with a crimp portion 16A, which is a portion of the crimp portion 16, a joint portion 17A, which is a portion of the joint portion 17, and a connecting portion 15A, which is a portion of the connecting portion 15. The blank 2A of the terminal 2 is integrally connected to the carrier 8 in a state where the press-fit portion blank portion 16A, the connection portion blank portion 17A, and the connection portion blank portion 15A are integrally formed in series in this order. The blank 2A of the terminal 2 is connected to the carrier 8 in a state where the crimp portion blank portion 16A, the connection portion blank portion 17A, and the connection portion blank portion 15A, which are arranged in series, extend in a direction perpendicular to the direction in which the carrier 8 extends in a belt shape. And, the blank 2A of the terminal 2 is joined to the carrier 8 at the connecting portion blank portion 15A.
After the punching step S101 is completed, the folding step S102 is performed. Referring to fig. 8 (B), the folding step S102 is configured as follows: the core wire leading end 21 of the crimp portion 16 of the terminal 2, on which the curved surface portion 22 is provided, is formed by bending the edge portion of the distal end side of the crimp portion blank portion 16A in a manner of approximately 180 ° folded back. In the folding-back step S102, the core wire leading end portion 21 is formed by folding back a portion on the distal end side of the press-contact portion blank portion 16A by a press mold configured as a bending mold in a state where the blank 2A of the terminal 2 connected to the carrier 8 is fixed. In the state after the completion of the folding-back step S102, the core wire leading-out end portion 21 is provided as a portion folded back in a double-layered state at the end of the press-bonding portion blank portion 16A.
After the folding step S102 is completed, the slitting/raising step S103 is performed. The cut-and-raise step S103 is configured as follows: the plurality of spring portions 18 and the plurality of protruding portions 19 are formed by cutting and raising the connecting portion blank portion 15A in the blank 2A of the terminal 2. In the cut-and-raised step S103, the blank 2A of the terminal 2 connected to the carrier 8 is subjected to cut-and-raised processing for cutting and bending portions of a plurality of portions in the connecting portion blank portion 15A by a press die, thereby forming the spring portion 18 and the protruding portion 19.
After the end of the slitting/raising step S103, a bending step S104 is performed. Fig. 9 is a diagram for explaining the bending step S104, and shows the terminal 2 in a state of being connected to the carrier 8, in which fig. 9 (a) is a plan view, fig. 9 (B) is a side view, and fig. 9 (C) is a front view.
Referring to fig. 9, the bending step S104 includes the following steps: the blank 2A of the terminal 2 is bent so as to be bent by approximately 90 ° or more around a central axis in a direction perpendicular to a direction in which the carrier 8 extends in a belt shape, whereby the terminal 2 is formed in a state before being connected to the carrier 8 and the core wire 4 of the cable 3. More specifically, in the bending step S104, the connection portion 15A, the connection portion 17A, and the crimp portion 16A of the blank 2A of the terminal 2 are bent so as to be bent by approximately 90 ° or more about the central axis, whereby the connection portion 15, the connection portion 17, and the crimp portion 16 of the terminal 2 in a state before being connected to the core wire 4 of the cable 3 are formed.
In the bending step S104, the connection portion 15, the connection portion 17, and the pressure-bonding portion 16 are formed by bending the connection portion blank 15A, the connection portion blank 17A, and the pressure-bonding portion blank 16A of the blanks 2A of the terminals 2 connected to the carrier 8 using a press mold configured as a bending mold. That is, in the bending step S104, the connecting portion 15 is formed by bending the connecting portion blank portion 15A, the connecting portion 17 is formed by bending the connecting portion blank portion 17A, and the pressure-bonding section 16 is formed by bending the pressure-bonding portion blank portion 16A. In addition, in a state after the bending step S104 is completed, as shown in fig. 9, the terminal 2 in a state of being coupled to the carrier 8 is formed, and the central strip portion 11, the first side wall portion 12, and the second side wall portion 13 are formed in the terminal 2.
After the bending step S104 is completed, a separation step S105 is performed. The separation step S105 is configured to separate the terminals 2 from the carrier 8. In the present embodiment, in the disconnecting step S105, the terminal 2 in a state before the core wire 4 of the connection cable 3 is disconnected from the carrier 8. After the bending step S104 is completed and before the separating step S105, the terminal 2 is connected to the carrier 8 at the end of the connecting portion 15 in a state before the core wire 4 is connected, and in a state where the first side wall portion 12 and the second side wall portion 13 are opened obliquely toward the outer sides of both sides in the width direction W. In this state, the cutting step S105 is performed, and the connection portion between the end portion of the terminal 2 on the connection portion 15 side and the carrier 8 is cut off.
When the disconnecting step S105 is completed, the core wire arrangement step S106 is performed. Fig. 10 (a) and 10 (B) are diagrams for explaining the core wire arrangement step S106, where fig. 10 (a) is a diagram showing a state before the core wire 4 of the cable 3 is arranged at the terminal 2, and fig. 10 (B) is a diagram showing a state after the core wire 4 of the cable 3 is arranged at the terminal 2. Fig. 10 schematically illustrates a core wire 4 configured as a conductor in a state where a plurality of wires are bundled.
Referring to fig. 10, in the core wire arrangement step S106, the core wire 4 at the core wire exposed portion 5 on the distal end side of the cable 3 is arranged between the first side wall portion 12 and the second side wall portion 13 with respect to the terminal 2 in the state before the core wire 4 is connected, that is, the terminal 2 in the state in which the first side wall portion 12 and the second side wall portion 13 are opened obliquely toward the both outer sides in the width direction W. In the core wire arrangement step S106, when the core wire 4 on the distal end side of the cable 3 is arranged between the first side wall portion 12 and the second side wall portion 13, the core wire 4 is arranged in a state extending along the longitudinal direction L of the terminal 2, and is arranged over the connection portion 15, the connection portion 17, and the pressure-bonding portion 16.
As described above, in the core wire arrangement step S106, the core wire 4 is arranged between the first side wall portion 12 and the second side wall portion 13, and thereby the core wire 4 is arranged between the connection portion 15 and the pressure-bonding section 16. Thus, the core wire arrangement step S106 includes the steps of: the core wire 4 of the distal end portion of the cable 3 is arranged at the crimp portion 16 formed by bending the crimp portion blank portion 16A and the crimp portion 16 in a state before crimping the core wire 4. The core wire arrangement step S106 is also configured to: the core wire 4 of the distal end portion of the cable 3 is arranged at the connection portion 15 in a state before the core wire 4 is connected to the connection portion 15 formed by bending the connection portion blank portion 15A.
At the end of the core wire arrangement step S106, a connection portion forming step S107 of forming the connection portion 15 connected to the core wire 4 of the cable 3 and a crimping step S108 of forming the crimping portion 16 crimped to the core wire 4 of the cable 3 and connected to the core wire 4 are performed. Fig. 11 is a diagram for explaining the connecting portion forming step S107 and the pressure bonding step S108, and is a perspective view showing the die unit 30 used in the connecting portion forming step S107 and the pressure bonding step S108.
Referring to fig. 11, the die unit 30 used in the connecting portion forming step S107 and the crimping step S108 is configured to include a connecting portion die 31 and a crimping portion die 32. The connecting portion mold 31 is configured as a mold for forming the connecting portion 15 in a state of being connected to the core wire 4. The crimping part mold 32 is configured as a mold for forming the crimping part 16 in a state of being crimped to the core wire 4 and connected to the core wire 4.
In the connecting portion forming step S107, the connecting portion 15 connected to the core wire 4 is formed by using the connecting portion mold 31 in the mold unit 30. Then, in the crimping step S108, the crimping part 16 in a state where the crimping part 16 is crimped to the core wire 4 and connected to the core wire 4 is formed by using the crimping part mold 32 in the mold unit 30.
The connecting portion forming step S107 and the pressure bonding step S108 may be performed simultaneously. In this case, the operation of forming the connection portion 15 and the crimp portion 16 connected to the core wire 4 is performed simultaneously by using the connection portion mold 31 and the crimp portion mold 32 at the same time. Further, the connection portion forming step S106 may be performed first, and then the pressure bonding step S108 may be performed. In this case, the operation of forming the connection portion 15 connected to the core wire 4 using the connection portion mold 31 is performed first, and then the operation of forming the crimp portion 16 connected to the core wire 4 using the crimp portion mold 32 is performed. In the flowchart of fig. 7, the case where the pressure bonding step S108 is performed after the connection portion forming step S107 is performed. Further, the pressure bonding step S108 may be performed first, and then the connecting portion forming step S107 may be performed. In this case, the operation of forming the crimp portion 16 connected to the core wire 4 by using the crimp portion mold 32 is performed first, and then the operation of forming the connection portion 15 connected to the core wire 4 by using the connection portion mold 31 is performed.
Referring to fig. 11, the connecting portion mold 31 used in the connecting portion forming step S107 is configured to include an upper tooth mold 31a and a lower tooth mold 31b. In the connecting portion forming step S107, the connecting portion 15 on which the core wire 4 is arranged is sandwiched and pressed by the connecting portion mold 31 having the upper tooth mold 31a and the lower tooth mold 31b, and the connecting portion 15 is bent into a cylindrical shape so as to cover the core wire 4. Thereby, the connecting portion 15 is formed in a state of covering the core wire 4 from the outside.
Further, the upper die 31a of the connecting portion die 31 is provided with a first molding groove portion 35a, a second molding groove portion 36a, and a third molding groove portion 37a, each of which is formed as a groove-like depression. The first molding groove 35a, the second molding groove 36a, and the third molding groove 37a are provided in series in the upper die 31 a. Further, the upper die 31a is provided with a first slit portion 38a between the first molding groove portion 35a and the second molding groove portion 36a, and a second slit portion 39a between the second molding groove portion 36a and the third molding groove portion 37a.
In addition, the overall shape of the lower tooth mold 31b of the connecting portion mold 31 is formed as follows: the cross section has a substantially isosceles triangle shape, and a portion on the vertex side in the substantially isosceles triangle shape is narrowed so as to narrow in width so as to be fitted into the first molding groove portion 35a, the second molding groove portion 36a, and the third molding groove portion 37a of the upper tooth mold 31 a. The lower die 31b is provided with a first molding concave portion 35b, a second molding concave portion 36b, and a third molding concave portion 37b, each of which is formed as an arc-shaped concave portion, at an end portion on the apex side where the width is narrowed so as to fit into the upper die 31 a. The first molding concave portion 35b, the second molding concave portion 36b, and the third molding concave portion 37b are provided in series on the lower die 31 b. In the lower die 31b, a first slit portion 38b is provided between the first molding concave portion 35b and the second molding concave portion 36b, and a second slit portion 39b is provided between the second molding concave portion 36b and the third molding concave portion 37b.
In the connecting portion forming step S107, when the connecting portion 15 in which the core wire 4 is disposed is sandwiched between the upper and lower dies 31a and 31b, the first molding groove 35a faces the first molding recess 35b, the second molding groove 36a faces the second molding recess 36b, and the third molding groove 37a faces the third molding recess 37b in the upper and lower dies 31a and 31 b. Then, the portion of the connecting portion 15 on the distal end side of the spring portion 18 is pressed by the first molding groove portion 35a and the first molding concave portion 35b, and is bent into a cylindrical shape so as to cover the core wire 4. Further, the portion between the spring portion 18 and the protruding portion 19 in the connecting portion 15 is pressed by the second molding groove portion 36a and the second molding concave portion 36b to be bent into a cylindrical shape so as to cover the core wire 4. Further, the portion of the connecting portion 15 closer to the connecting portion 17 than the protruding portion 19 is pressed by the third molding groove 37a and the third molding concave portion 37b, and is bent into a cylindrical shape so as to cover the core wire 4. When the connecting portion 15 in which the core wire 4 is arranged is sandwiched between the upper and lower dies 31a and 31b, the first slit portion 38a faces the first slit portion 38b and the second slit portion 39a faces the second slit portion 39b in the upper and lower dies 31a and 31 b. Thus, the upper and lower dies 31a and 31b are configured such that the spring portion 18 is disposed in the space between the first slit portion 38a and the first slit portion 38b without pressing the spring portion 18. The upper and lower dies 31a and 31b are configured such that the protruding portion 19 is disposed in a space between the second slit portion 39a and the second slit portion 39b without pressing the protruding portion 19.
Fig. 12 is a diagram for explaining the crimping step S108, and shows a state in which the terminal 2 is crimped to the core wire 4 by the crimping portion die 32. In fig. 12, a cross section of the crimping part die 32 in a state where the terminal 2 is crimped to the core wire 4 is shown. Referring to fig. 11 and 12, the crimping part mold 32 used in the crimping step S108 is configured to have a first tooth mold part 33 and a second tooth mold part 34. The first tooth mold portion 33 and the second tooth mold portion 34 are provided separately from each other. The first tooth mold portion 33 is provided as a tooth mold portion that sandwiches and presses the core wire surrounding portion 20 in the pressure-bonding section 16, and is configured to include an upper tooth mold 33a and a lower tooth mold 33b. The second tooth mold portion 34 is provided as a tooth mold portion that sandwiches and presses the core wire leading end portion 21 in the pressure-bonding section 16, and is configured to include an upper tooth mold 34a and a lower tooth mold 34b.
The pressure bonding step S108 is configured as follows: the crimp portion 16 on which the core wire 4 is arranged is sandwiched and pressed by the crimp portion die 32, and the core wire 4 is crimped by the crimp portion 16, wherein the crimp portion die 32 includes a first tooth die portion 33 having an upper tooth die 33a and a lower tooth die 33b, and a second tooth die portion 34 having an upper tooth die 34a and a lower tooth die 34b. In the crimping step S108, the first tooth mold portion 33 and the second tooth mold portion 34 are used in a superimposed state. That is, in the crimping step S108, the crimping part 16 where the core wire 4 is arranged is sandwiched and pressed by the crimping part mold 32 in a state where the upper die 33a of the first die part 33 overlaps the upper die 34a of the second die part 34 and the lower die 33b of the first die part 33 overlaps the lower die 34b of the second die part 34, and the core wire 4 is crimped to the crimping part 16.
Further, the upper die 33a of the first die portion 33 is provided with a molding groove portion 40a formed as a groove-like depression. The lower die 33b of the first die portion 33 includes: a portion having a cross section of a substantially isosceles triangle shape, and a prismatic portion formed in a shape extending from the vertex side of the portion having a cross section of a substantially isosceles triangle shape and fitted into the molding groove portion 40a of the upper tooth mold 33 a. The lower die 33b is provided with a molding recess 40b formed in an arc-shaped recess at an end portion of a prismatic portion formed to fit into the upper die 33 a.
Further, the upper die 34a of the second die portion 34 is provided with a molding groove portion 41a formed as a groove-like depression. The lower die 34b of the second die portion 34 includes: a portion having a substantially isosceles triangle-shaped cross section, and a prismatic portion formed in a shape extending from the vertex side of the portion having a substantially isosceles triangle-shaped cross section and fitted into the molding groove portion 41a of the upper tooth mold 34 a. The lower die 34b is provided with a molding recess 41b formed in an arc-shaped recess at an end portion of a prismatic portion formed to fit into the upper die 34 a.
In the crimping step S108, the crimping part 16 on which the core wire 4 is arranged is sandwiched and pressed by the crimping part dies 32 in a state where the first tooth die part 33 and the second tooth die part 34 are overlapped. At this time, the core wire surrounding portion 20 in the crimping portion 16 where the core wire 4 is arranged is sandwiched by the upper tooth mold 33a and the lower tooth mold 33b in the first tooth mold portion 33. At this time, the molding groove 40a faces the molding recess 40b in the upper and lower dies 33a and 33 b. Then, the portion of the core surrounding portion 20 in the pressure-bonding section 16 is pressed by the molding groove portion 40a and the molding concave portion 40b to be pressed against the core 4, thereby being pressure-bonded to the core 4.
In addition, when the crimping portion 16 in which the core wire 4 is arranged is clamped and pressed by the crimping portion die 32 in the crimping step S108, the core wire lead-out end portion 21 in the crimping portion 16 in which the core wire 4 is arranged is clamped by the upper and lower dies 34a and 34b in the second die portion 34. At this time, the molding groove 41a faces the molding recess 41b in the upper and lower dies 34a and 34 b. Then, the portion of the core wire lead-out end 21 in the pressure-bonding section 16 is pressed against the core wire 4 by the molding groove 41a and the molding recess 41b, and is thereby pressure-bonded to the core wire 4.
In the pressure-bonding section 16, a folded-back portion 23 is provided in a state where a plate-like portion 20a constituting the core wire surrounding portion 20 is folded back from the inside toward the outside of the core wire surrounding portion 20 at the core wire leading end portion 21 and is overlapped. Therefore, the pressure-bonding section 16 is configured as: the diameter dimension of the core wire lead-out end portion 21 is larger than the diameter dimension of the core wire surrounding portion 20 in a state where the core wire 4 is covered in a surrounding manner in a state of being crimped to the core wire 4. That is, the pressure-bonding section 16 is provided in a state of being pressure-bonded to the core wire 4, with the core wire leading end portion 21 being expanded in a stepwise manner with respect to the core wire surrounding portion 20. In the first tooth mold portion 33, the space between the molding groove portion 40a of the upper tooth mold 33a and the molding recess portion 40b of the lower tooth mold 33b in a state of sandwiching and pressing the core wire surrounding portion 20 is set to a size corresponding to the diameter size of the core wire surrounding portion 20 in a state of surrounding the core wire 4. In the second tooth mold portion 34, the space between the molding groove portion 41a of the upper tooth mold 34a and the molding recess portion 41b of the lower tooth mold 34b in a state in which the core wire extraction end portion 21 is sandwiched and pressed is set to a size corresponding to the diameter size of the core wire extraction end portion 21.
The crimping step S108 is completed, and the connection method of the present embodiment for connecting the terminal 2 and the cable 3 is completed. The connection method of the present embodiment is completed, and the terminal 2 is connected to the cable 3, thereby constituting the cable assembly 1.
[ Effect of the present embodiment ]
As described above, according to the present embodiment, the core wire 4 at the distal end portion of the cable 3 is crimped to the crimp portion 16, whereby the terminal 2 is connected to the cable 3, and the connection portion 15 to which the terminal 2 of the cable 3 is connected to the substrate 100 as the connection object, whereby the cable 3 and the substrate 100 are connected via the terminal 2. The core wire 4 of the cable 3 is crimped to the crimp portion 16 of the terminal 2 in a state where the outer periphery is surrounded by the core wire surrounding portion 20, and the core wire 4 is drawn out from the crimp portion 16 in a state of extending along the curved surface portion 22, the curved surface portion 22 being provided along the edge portion of the core wire drawing end portion 21 drawn out from the crimp portion 16 and extending in an arc shape from the inside to the outside of the core wire surrounding portion 20. Therefore, the load is suppressed from being locally concentrated on the core wire 4 of the cable 3 at the edge portion of the crimp portion 16, and the core wire 4 is supported in a state where the load is dispersed to the curved surface portion 22 of the core wire lead-out end portion 21. This reduces the load on the core wire 4 when the cable 3 is bent, and suppresses damage to the core wire 4.
Further, according to the present embodiment, the load of the core wire 4 when the cable 3 is bent can be reduced to suppress the damage of the core wire 4, and the distal end portion of the cable 3 is connected to the terminal 2 only by crimping the core wire 4 to the crimp portion 16 of the terminal 2. Therefore, there is no need to provide a separate reinforcing member for reducing the load on the core wire 4 when the cable 3 is bent to suppress damage to the core wire 4. Therefore, according to the present embodiment, the load of the core wire 4 when the cable 3 is bent can be reduced, the damage of the core wire 4 can be suppressed, and the number of components and man-hours for connecting the terminal 2 and the cable 3 can be suppressed from increasing.
In addition, according to the present embodiment, the distal end portion of the cable 3 is connected to the terminal 2 only by crimping the core wire 4 to the crimp portion 16 of the terminal 2. That is, the terminal 2 is press-bonded only to the core wire 4 of the cable 3, and is not press-bonded to the resin coating portion 6 of the cable 3. Further, according to the present embodiment, since the reinforcing resin member is not separately provided, the reinforcing resin member is not pressure-bonded to the reinforcing resin member. Therefore, even when the terminal 2 connected to the cable 3 is connected to the substrate 100 by a method involving heating at high temperature like soldering, heat from the terminal 2 is not directly transferred to a resin member on the cable 3 side such as the coating portion 6 of the cable 3. This can suppress the influence of heat added to the terminal 2 on the resin member on the cable 3 side when the cable 3 is connected to the substrate 100 via the terminal 2.
Therefore, according to the present embodiment, it is possible to provide the terminal 2 in which the load of the core wire 4 when the cable 3 is bent is reduced, the damage of the core wire 4 is suppressed, the number of components and man-hours for connecting the terminal 2 and the cable 3 are suppressed, and the influence of heat added to the terminal 2 when the cable 3 and the substrate 100 are connected via the terminal 2 on the resin component on the cable 3 side is suppressed.
In the present embodiment, the connection object is the substrate 100, and the terminals 2 to which the cables 3 are connected in a substantially vertical posture with respect to the substrate 100, whereby the terminals 2 are mounted on the substrate 100. Accordingly, the mounting height of the terminal 2 with respect to the substrate 100 is determined according to the height of the crimp portion 16 protruding perpendicularly from the surface 100b of the substrate 100 in the terminal 2. Further, according to the present embodiment, the crimp portion 16 of the terminal 2 is crimped only to the core wire 4 of the cable 3, and is not crimped to the resin coating portion 6 in the cable 3. As a result, according to the terminal 2 of the present embodiment, the length of the crimp portion 16 of the terminal 2 can be reduced as compared with a terminal of a type that is crimped to both the core wire 4 and the coating portion 6 of the cable 3. Therefore, according to the present embodiment, the height of the terminal 2 protruding vertically from the substrate 100 can be reduced, and the mounting height of the terminal 2 with respect to the substrate 100 can be reduced.
Further, according to the present embodiment, by providing the portion folded back and overlapped at the core wire leading end portion 21, the curved surface portion 22 extending in a semicircular shape from the inside to the outside of the core wire surrounding portion 20 can be easily formed. Further, since the curved surface portion 22 provided along the edge portion of the core wire leading end portion 21 and extending in an arc shape from the inside to the outside of the core wire surrounding portion 20 is provided in a semicircular shape, even when the bending angle of the cable 3 is large, the load of the core wire 4 at the time of bending the cable 3 can be reduced and the damage of the core wire 4 can be suppressed.
Further, according to the present embodiment, the plate-like portion 20a constituting the core wire surrounding portion 20 at the core wire leading end portion 21 is provided in a state of being folded back from the inside toward the outside of the core wire surrounding portion 20 to be overlapped. Therefore, the core wire 4 which is drawn and extended from the inside to the outside of the core wire surrounding portion 20 is arranged and drawn in such a manner as to extend more smoothly along the curved surface portion 22. Therefore, the load is further suppressed from being locally concentrated on the core wire 4 of the cable 3 at the edge portion of the crimping portion 16, and the core wire 4 is supported in a state where the load is further dispersed in the curved surface portion 22 of the core wire lead-out end portion 21. This can further reduce the load on the core wire 4 when the cable 3 is bent, and further suppress the damage to the core wire 4.
In addition, according to the present embodiment, the connection portion 15 connected to the substrate 100 is formed in a tubular shape covering the core wire 4, and the tubular connection portion 15 is soldered while being inserted into the through hole 100a of the substrate 100. Therefore, by making the inner diameter of the through-hole 100a slightly larger than the outer diameter of the tubular connecting portion 15, the gap between the connecting portion 15 and the through-hole 100a can be reduced in a state where the terminal 2 is inserted into the through-hole 100a of the substrate 100. Alternatively, when the tubular connecting portion 15 is configured to be elastically deformable and reduced in diameter when an external force directed radially inward from the outer periphery is applied, the inner diameter of the through hole 100a may be made the same as the outer diameter of the tubular connecting portion 15, or the inner diameter of the through hole 100a may be made slightly smaller than the outer diameter of the tubular connecting portion 15. By setting the inner diameter of the through hole 100a and the outer diameter of the tubular connecting portion 15 in this manner, the gap between the connecting portion 15 and the through hole 100a can be made extremely small in a state where the terminal 2 is inserted into the through hole 100a of the substrate 100. Then, in a state where the terminal 2 is inserted into the through hole 100a of the substrate 100 and before the core wire 4 is soldered to the substrate 100, the terminal 2 is not likely to be greatly inclined with respect to the substrate 100. Thereby, the core wire 4 and the substrate 100 can be soldered while the cable 3 is held substantially perpendicular to the substrate 100.
In addition, according to the present embodiment, by making the inner diameter of the through hole 100a slightly larger than the outer diameter of the tubular connection portion 15, the gap between the connection portion 15 and the through hole 100a can be reduced in a state where the terminal 2 is inserted into the through hole 100a of the substrate 100. Alternatively, when the tubular connection portion 15 is elastically deformable and is reduced in diameter, the inner diameter of the through-hole 100a is made the same as the outer diameter of the tubular connection portion 15, or the inner diameter of the through-hole 100a is made slightly smaller than the outer diameter of the tubular connection portion 15, whereby the gap between the connection portion 15 and the through-hole 100a can be made extremely small in a state where the terminal 2 is inserted into the through-hole 100a of the substrate 100. Then, when the substrate 100 and the core wire 4 are soldered, the molten solder is easily sucked into the gap by capillary phenomenon. This ensures that the amount of solder that reaches between the substrate 100 and the core wire 4.
In addition, according to the connection method of the present embodiment (connection method of the terminal 2 and the cable 3), after the blank 2A of the terminal 2 is punched out of the plate-like metal member, the crimp portion blank portion 16A is bent in a folded-back manner, so that the core wire extraction end portion 21 provided with the curved surface portion 22 can be easily formed. Further, by disposing the core wire 4 in the press-fit portion blank portion 16A and sandwiching and pressing the core wire 4 by the upper and lower tooth dies (33 a, 34a, 33b, 34 b), the terminal 2 can be press-fitted to the core wire 4 at the press-fit portion 16, and the terminal 2 can be connected to the cable 3. In addition, in a state where the terminal 2 and the cable 3 are connected by the connection method according to the present embodiment, the curved surface portion 22 of the edge portion of the pressure-bonding section 16 can reduce the load of the core wire 4 when the cable 3 is bent, and thus the damage of the core wire 4 can be suppressed. In addition, in a state where the terminal 2 and the cable 3 are connected by the connection method of the present embodiment, the distal end portion of the cable 3 is connected to the terminal 2 only by crimping the core wire 4 to the crimp portion 16 of the terminal 2. Therefore, it is not necessary to provide a separate reinforcing member for suppressing damage to the core wire 4, and the number of members for connecting the terminal 2 and the cable 3 and the number of man-hours can be suppressed. In the state where the terminal 2 and the cable 3 are connected by the connection method according to the present embodiment, the terminal portion of the cable 3 is connected to the terminal 2 only by crimping the core wire 4 to the crimp portion 16 of the terminal 2, and therefore, the terminal portion is not crimped to the resin coating portion 6 of the cable 3, and a reinforcing resin member is not separately provided. Therefore, even when the terminal 2 connected to the cable 3 is connected to the substrate 100 by a method involving heating at high temperature like soldering, heat from the terminal 2 is not directly transferred to a resin member on the cable 3 side such as the coating portion 6 of the cable 3. This can suppress the influence of heat added to the terminal 2 on the resin member on the cable 3 side when the cable 3 is connected to the substrate 100 via the terminal 2.
Therefore, according to the present embodiment, it is possible to provide a method for connecting the terminal 2 and the cable 3, in which the load of the core wire 4 when the cable 3 is bent can be reduced, the damage to the core wire 4 can be suppressed, the number of components for connecting the terminal 2 and the cable 3 and the number of man-hours can be suppressed, and the influence of heat added to the terminal 2 on the resin components on the side of the cable 3 when the cable 3 and the substrate 100 are connected via the terminal 2 can be suppressed.
In addition, according to the connecting method of the present embodiment, the first tooth mold portion 33 and the second tooth mold portion 34 that sandwich and press the core surrounding portion 20 and the core lead-out end portion 21, respectively, are provided in the crimping portion mold 32. Therefore, the structure of the crimping part mold 32 that accurately fits the difference in shape between the core wire surrounding part 20 that surrounds the outer periphery of the core wire 4 and is crimped to the core wire 4 and the core wire lead-out end part 21 that is provided with the curved surface part 22 by bending the crimping part blank part 16A in a folded-back manner can be easily set. Further, by the pressing operation of 1 pressing the press-fit portion blank portion 16A on which the core wire 4 is arranged by sandwiching and pressing the press-fit portion blank portion with the press-fit portion die 32 having the first tooth die portion 33 and the second tooth die portion 34, the core wire surrounding portion 20 and the core wire lead-out end portion 21 can be pressed simultaneously, and the core wire 4 is brought into a state of being press-fitted by the press-fit portion 16. Therefore, in the method of connecting the terminal 2 and the cable 3, which can reduce the load of the core wire 4 when the cable 3 is bent and suppress the damage of the core wire 4, the crimping of the core wire 4 and the terminal 2 can be easily and efficiently performed.
In addition, according to the connecting method of the present embodiment, the split first tooth mold portion 33 and second tooth mold portion 34 form the crimping portion mold 32 in a state of being overlapped. Therefore, the structure of the crimping part mold 32 that is accurately compatible with the difference in the shape of each of the core wire surrounding part 20 and the core wire leading end part 21 can be set more easily. Further, since the first tooth mold portion 33 and the second tooth mold portion 34 can be formed and combined separately, the manufacturing of the crimping portion mold 32 is facilitated, and the degree of freedom in the design of the structure of the crimping portion mold 32 can be improved.
Modification example
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and can be variously modified within the scope described in the claims. For example, the following modifications may be implemented.
(1) In the embodiment described above, the following description is given by way of example: at the core wire leading end 21 of the pressure-bonding section 16, a curved surface portion 22 provided along the edge portion of the core wire surrounding portion 20 is provided as a surface of a folded portion 23, the folded portion 23 being formed by providing a plate-like portion 20a constituting the core wire surrounding portion 20 in a state folded back from the inside toward the outside of the core wire surrounding portion 20 at the core wire leading end 21, but this may not be the case. For example, a terminal having a curved surface portion provided as a surface of a folded portion 23, the folded portion 23 being formed by arranging a plate-like portion 20a constituting the core surrounding portion 20 in a state folded back from the outside toward the inside of the core surrounding portion 20 at the core lead-out end portion 21, may be implemented.
Fig. 13 is a diagram showing the terminal 51 of the first modification example, fig. 13 (a) is a perspective view showing a state before the terminal 51 of the first modification example is connected to the core wire 4 of the cable 3, and fig. 13 (B) is a perspective view showing a state in which the terminal 51 of the first modification example is connected to the core wire 4 of the cable 3 and the illustration of the core wire 4 is omitted. The terminal 51 shown in fig. 13 is configured in the same manner as the terminal 2 of the embodiment. However, the structure of the curved surface portion 22a of the terminal 51 provided at the core wire leading end portion 21 of the crimp portion 16 is different from the curved surface portion 22 of the core wire leading end portion 21 provided at the crimp portion 16 of the terminal 2. In the following description of the terminal 51 according to the first modification, the configuration of the curved surface portion 22a different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same configurations as those of the above-described embodiment or the configurations corresponding thereto, so that the repetitive description thereof will be omitted.
The folded portion 23 in the crimp portion 16 of the terminal 51 is formed by providing the plate-like portion 20a constituting the core wire surrounding portion 20 in a state folded back from the outside toward the inside of the core wire surrounding portion 20 at the core wire leading-out end portion 21 so as to be overlapped. The curved surface portion 22a provided along the edge portion of the core surrounding portion 20 at the core lead-out end portion 21 of the crimp portion 16 of the terminal 51 is provided as a surface of the folded portion 23, and the folded portion 23 is formed by providing the plate-like portion 20a constituting the core surrounding portion 20 in a state folded back from the outside toward the inside of the core surrounding portion 20 at the core lead-out end portion 21 so as to overlap. Thereby, the curved surface portion 22a is provided to extend in a semicircular shape from the inside to the outside of the core wire surrounding portion 20.
As described above, the terminal 51 having the curved surface portion 22a may be implemented, and the curved surface portion 22a is provided as the surface of the folded portion 23, and the folded portion 23 is formed by arranging the plate-like portion 20a constituting the core wire surrounding portion 20 in a state folded back from the outside toward the inside of the core wire surrounding portion 20 at the core wire leading end portion 21 of the pressure-bonding section 16.
(2) In the above embodiment, the description has been made taking as an example the case where the folded-back portion 23 is provided at the core wire leading end portion 21 of the pressure-bonding section 16, and the curved surface portion 22 is provided as the surface of the folded-back portion 23, but this may not be the case. For example, a terminal may be implemented in which the folded portion 23 is not provided and a curved portion is formed at a portion on the distal end side of the plate-like portion 20a constituting the core wire surrounding portion 20.
Fig. 14 is a diagram showing the terminal 52 according to the second modification, fig. 14 (a) is a perspective view showing a state before the terminal 52 according to the second modification is connected to the core wire 4 of the cable 3, fig. 14 (B) is a diagram showing a part of the pressure-bonding section 16 of the terminal 52 shown in fig. 14 (a) in an enlarged manner, and fig. 14 (C) is a perspective view showing a state in which the terminal 52 according to the second modification is connected to the core wire 4 of the cable 3 and the illustration of the core wire 4 of the cable 3 is omitted. The terminal 52 shown in fig. 14 is configured in the same manner as the terminal 2 of the embodiment described above. However, the structure of the curved surface portion 22b of the terminal 52 provided at the core wire leading end portion 21 of the crimp portion 16 is different from the curved surface portion 22 of the core wire leading end portion 21 provided at the crimp portion 16 of the terminal 2. In the following description of the terminal 52 according to the second modification, the configuration of the curved surface portion 22b different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same configurations as those of the above-described embodiment or to the configurations corresponding thereto, so that the repetitive description thereof will be omitted.
In the pressure-bonding section 16 of the terminal 52, the plate-like portion 20a constituting the core surrounding portion 20 is not folded back at the core lead-out end portion 21, and a portion of the pressure-bonding section 16 of the terminal 2 corresponding to the folded-back portion 23 is not provided. At the core wire leading end 21 of the crimp portion 16 of the terminal 52, a curved surface portion 22b is provided from the inner peripheral surface of the distal end side portion to the distal end side end surface in the longitudinal direction L of the plate-like portion 20a constituting the core wire surrounding portion 20. The curved surface portion 22b is provided as a portion of such a curved surface: the inner peripheral surface of the plate-like portion 20a extends from the end side to the end surface of the end side in the longitudinal direction L, and extends in an arc shape from the inside to the outside of the core wire surrounding portion 20. The plate thickness of the portion of the plate-like portion 20a on the distal end side in the longitudinal direction L where the curved surface portion 22b is provided is formed so as to be thinner toward the distal end side in the longitudinal direction L.
As described above, the terminal 52 having the curved surface portion 22b may be implemented, and the curved surface portion 22b may be provided so as to extend in an arc shape from the inner peripheral surface of the distal end side portion of the plate-like portion 20a constituting the core surrounding portion 20 to the distal end side end surface at the core lead-out end portion 21 of the pressure-bonding section 16.
(3) In the above embodiment, the description has been made taking, as an example, a case where the folded portion 23 and the curved surface portion 22 are provided as the surfaces of the folded portion 23 in a state where the plate-like portion 20a constituting the core surrounding portion 20 is folded back and overlapped are provided at the core lead-out end portion 21 of the pressure bonding portion 16, but this may not be the case. For example, the following terminal scheme may be implemented: the folded portion 23 is not provided, and a portion on the distal end side of the plate-like portion 20a constituting the core surrounding portion 20 is expanded toward the outside of the core surrounding portion 20 and is curved so as to form a curved surface, thereby providing a curved surface portion.
Fig. 15 is a diagram showing the terminal 53 of the third modification example, fig. 15 (a) is a perspective view showing a state before the terminal 53 of the third modification example is connected to the core wire 4 of the cable 3, and fig. 15 (B) is a perspective view showing a state in which the terminal 53 of the third modification example is connected to the core wire 4 of the cable 3 and the illustration of the core wire 4 of the cable 3 is omitted. The terminal 53 shown in fig. 15 is configured in the same manner as the terminal 2 of the embodiment. However, the structure of the curved surface portion 22c of the terminal 53 provided at the core wire extraction end portion 21 of the crimp portion 16 is different from the curved surface portion 22 of the core wire extraction end portion 21 provided at the crimp portion 16 of the terminal 2. In the following description of the terminal 53 according to the third modification, the configuration of the curved surface portion 22c different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same configurations as those of the above-described embodiment or the configurations corresponding thereto, and thus, the overlapping description will be omitted.
In the crimp portion 16 of the terminal 53, the plate-like portion 20a constituting the core surrounding portion 20 is not folded back at the core lead-out end portion 21, and a portion corresponding to the folded-back portion 23 in the crimp portion 16 of the terminal 2 is not provided. In the core wire leading end 21 of the crimp portion 16 of the terminal 53, a portion on the distal side in the longitudinal direction L of the plate-like portion 20a constituting the core wire surrounding portion 20 is formed so as to expand toward the outside of the core wire surrounding portion 20 and is curved so as to form a curved surface. Further, at the core wire leading end 21 of the crimp portion 16 of the terminal 53, a curved surface portion 22c is provided at a portion on the distal end side in the longitudinal direction L of the plate-like portion 20a which is expanded toward the outside of the core wire surrounding portion 20 and is curved so as to form a curved surface. The curved surface portion 22c is provided as a curved surface portion extending from the inner peripheral surface of the distal end side portion in the longitudinal direction L to the distal end side end surface in the plate-like portion 20a curved so as to extend toward the outside of the core wire surrounding portion 20, and extending in an arc shape from the inside to the outside of the core wire surrounding portion 20.
As described above, the terminal 53 having the curved surface portion 22c may be implemented, and the curved surface portion 22c may be provided so as to be expanded in an arc shape from the inner peripheral surface of the distal end side portion of the plate-like portion 20a, which is bent so as to expand toward the outside of the core surrounding portion 20, to the distal end side end surface at the core lead-out end portion 21 of the pressure-bonding section 16.
(4) In the embodiment described above, the following description is given by way of example: the folded portion 23 and the curved surface portion 22, which are overlapped in a state where the plate-like portion 20a constituting the core surrounding portion 20 is folded back approximately 180 ° are provided at the core lead-out end portion 21 of the pressure-bonding section 16, are provided as the surfaces of the folded portion 23, but this may not be the case. For example, the following terminal scheme may be implemented: the bent portion 23 formed by overlapping the plate-like portion 20a by approximately 180 ° is not provided, but a curved surface portion is provided by forming a portion on the distal end side of the plate-like portion 20a constituting the core wire surrounding portion 20 to be curved in an arc shape of 180 ° or more.
Fig. 16 is a diagram showing the terminal 54 of the fourth modification example, fig. 16 (a) is a perspective view showing a state before the terminal 54 of the fourth modification example is connected to the core wire 4 of the cable 3, and fig. 16 (B) is a perspective view showing a state in which the terminal 54 of the fourth modification example is connected to the core wire 4 of the cable 3 and the illustration of the core wire 4 of the cable 3 is omitted. The terminal 54 shown in fig. 16 is configured in the same manner as the terminal 2 of the embodiment. However, the structure of the curved surface portion 22d of the terminal 54 provided at the core wire leading end portion 21 of the crimp portion 16 is different from the curved surface portion 22 of the core wire leading end portion 21 provided at the crimp portion 16 of the terminal 2. In the following description of the terminal 54 according to the fourth modification, the configuration of the curved surface portion 22d different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same configurations or corresponding configurations as those of the above-described embodiment, so that the repetitive description thereof will be omitted.
In the crimp portion 16 of the terminal 54, the plate-like portion 20a constituting the core surrounding portion 20 is not formed in a state of overlapping by being folded back at approximately 180 ° at the core lead-out end portion 21, and a portion corresponding to the folded-back portion 23 in the crimp portion 16 of the terminal 2 is not provided. In the core wire leading end 21 of the crimp portion 16 of the terminal 54, a portion on the distal end side in the longitudinal direction L of the plate-like portion 20a constituting the core wire surrounding portion 20 is formed to be curved in an arc shape of 180 ° or more from the inside to the outside of the core wire surrounding portion 20. Therefore, a circular tube-shaped portion 60 formed by bending a portion of the plate-shaped portion 20a on the distal side in the longitudinal direction L in an arc shape of 180 ° or more is provided at the edge portion of the core wire leading end portion 21 of the crimp portion 16 of the terminal 54. Further, a curved surface portion 22d is provided in a circular tube-like portion 60 of the core wire leading end portion 21 formed in the pressure-bonding section 16 of the terminal 54. The curved surface portion 22d is provided as a surface of a circular tube-shaped portion 60 provided by bending the plate-shaped portion 20a in an arc shape of 180 ° or more from the inside to the outside of the core surrounding portion 20, and the curved surface portion 22d is provided as a curved surface portion extending in an arc shape from the inside to the outside of the core surrounding portion 20.
As described above, the terminal 54 having the curved surface portion 22d may be implemented, and the curved surface portion 22d may be provided as the surface of the circular tube-shaped portion 60, and the circular tube-shaped portion 60 may be provided by forming the plate-shaped portion 20a in the core wire leading end portion 21 of the pressure-bonding section 16 so as to be bent in an arc shape of 180 ° or more from the inside to the outside of the core wire surrounding portion 20.
(5) In the above embodiment, the description has been made taking as an example the case where the folded-back portion 23 is provided by folding back the plate-like portion 20a constituting the core surrounding portion 20 at the core lead-out end portion 21 of the pressure-bonding section 16, and the curved surface portion 22 is provided as the surface of the folded-back portion 23, but this may not be the case. For example, the following terminal scheme may be implemented: the folded portion 23 is not provided in the core wire surrounding portion 20, and the pressure-bonding section 16 has an edge member fixed to the core wire surrounding portion 20, and a curved surface portion is provided in the edge member.
Fig. 17 is a diagram showing the terminal 55 according to the fifth modification example, and fig. 17 (a) and 17 (B) are perspective views showing the state before the terminal 55 according to the fifth modification example is connected to the core wire 4 of the cable 3, and fig. 17 (C) is a perspective view showing the state in which the terminal 55 according to the fifth modification example is connected to the core wire 4 of the cable 3 and the illustration of the core wire 4 of the cable 3 is omitted. The terminal 55 shown in fig. 17 is configured in the same manner as the terminal 2 of the embodiment. However, the structure of the curved surface portion 22e of the terminal 55 provided at the core wire leading end portion 21 of the crimp portion 16 is different from the curved surface portion 22 of the core wire leading end portion 21 provided at the crimp portion 16 of the terminal 2. In the following description of the terminal 55 according to the fifth modification, the configuration of the curved surface portion 22e different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same configurations as those of the above-described embodiment or the configurations corresponding thereto, so that the repetitive description thereof will be omitted.
The crimp portion 16 of the terminal 55 has an edge member 61 fixed to an edge portion of the core surrounding portion 20 on the core lead-out end portion 21 side. Fig. 17 (a) shows a state in which the edge member 61 is not fixed to the edge portion of the core surrounding portion 20, and fig. 17 (B) shows a state in which the edge member 61 is fixed to the edge portion of the core surrounding portion 20. The edge member 61 is provided as a member having an elongated shape extending along an edge portion on the distal end side in the longitudinal direction L of the core wire surrounding portion 20. The edge member 61 is fixed to the edge portion on the distal end side in the longitudinal direction L of the core wire surrounding portion 20 by welding, for example. Further, a curved surface portion 22e extending in a semicircular shape from the inside to the outside of the core wire surrounding portion 20 in a state where the edge member 61 is fixed to the core wire surrounding portion 20 is provided at an end portion of the edge member 61 on the opposite side to the side fixed to the edge portion of the core wire surrounding portion 20. The curved surface portion 22e is provided to extend along the edge portion of the core wire surrounding portion 20 in a state where the edge member 61 is fixed to the core wire surrounding portion 20.
As described above, the following terminal 55 may be implemented: the crimp portion 16 has an edge member 61 fixed to an edge portion of the core wire surrounding portion 20 on the core wire leading end portion 21 side, and a curved surface portion 22e is provided on the edge member 61.
(6) In the above embodiment, the description has been made taking the connection object, which is the object to be connected to the cable 3 via the terminal 2, as the substrate 100 as an example, but this may not be the case. That is, the connection object, which is the object to which the cable 3 is connected via the terminal, may be other than the substrate 100. For example, a mode may be implemented in which the connection object other than the substrate 100, to which the cable 3 is connected via the terminal, is a backlight for a liquid crystal display device.
Fig. 18 is a diagram showing a terminal 56 according to a sixth modification example, fig. 18 (a) is a side view showing a state in which the terminal 56 according to the sixth modification example is connected to the core wire 4 of the cable 3 and is connected to the backlight 102 for the liquid crystal display device, and fig. 18 (B) is a front view showing a state in which the terminal 56 according to the sixth modification example is connected to the core wire 4 of the cable 3 and is not connected to the backlight 102 for the liquid crystal display device. The terminal 56 shown in fig. 18 is configured in the same manner as the terminal 2 of the embodiment. However, the structure of the connection portion 62 of the terminal 56 is different from the connection portion 15 of the terminal 2, and the connection portion 62 is connected to a connection object to which the cable 3 is connected via the terminal 56. In the following description of the terminal 56 according to the sixth modification, the structure of the connecting portion 62 different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same structures as those of the above-described embodiment or the corresponding structures in the drawings, so that the repetitive description thereof will be omitted.
The object to be connected to the cable 3 via the terminal 56 is a backlight 102 for a liquid crystal display device. The backlight 102 includes a light source tube 102a and a two meter wire 102b for energizing an electrode built in the light source tube 102 a. The connection portion 62 of the terminal 56 is connected to the backlight 102 at a two meter line 102b. The connection portion 62 is formed in a circular ring shape provided with a through hole 63 through which the two meter wire 102b is inserted, and is integrally connected to the pressure-bonding section 16. The connection portion 62 of the terminal 56 is soldered with the portion of the two-meter wire 102b protruding from the light source tube 102a inserted into the insertion hole 63, whereby the connection portion 62 is connected to the two-meter wire 102b. Fig. 18 (a) shows a state in which the illustration of the solder portion formed by soldering between the connection portion 62 and the two-meter wire 102b and connecting the connection portion 62 and the two-meter wire 102b is omitted.
As described above, the connection object, which is the object to be connected to the cable 3 via the terminal, may be other than the substrate 100. For example, a mode may be adopted in which the object to be connected to the cable 3 via the terminal 56, that is, the object to be connected other than the substrate 100, is the backlight 102 for the liquid crystal display device.
(7) In the above-described embodiment, the method of connecting the terminal 2 to the cable 3 has been described by taking the case where the separation step S105 is performed after the bending step S104 and before the core wire arrangement step S106, and the terminal 2 in the state before the core wire 4 of the connection cable 3 is separated from the carrier 8 as an example, but this may not be the case. That is, the step S105 of cutting the terminal 2 from the carrier 8 may be configured as a step of cutting the terminal 2 connected to the core wire 4 of the cable 3 from the carrier 8.
In the disconnecting step S105, when the terminal 2 connected to the core wire 4 of the cable 3 is disconnected from the carrier 8, the core wire arrangement step S106 is performed after the bending step S104, the connection portion forming step S107 and the crimping step S108 are performed, and then the disconnecting step S105 is performed. In this case, in the core wire arrangement step S106, the core wires 4 are arranged for the terminals 2 in a state of being coupled to the carrier 8. In the connection portion forming step S107, the connection portion 15 is formed in the terminal 2 connected to the carrier 8, and in the crimping step S108, the crimp portion 16 is crimped to the core wire 4 in the terminal 2 connected to the carrier 8. Thereby, the core wire 4 at the distal end portion of the cable 3 is pressure-bonded to the terminal 2 at the pressure-bonding section 16 in a state where the terminal 2 is coupled to the carrier 8 at the end portion of the connection section 15.
When the pressure bonding step S108 is completed, the separation step S105 is performed. In this cutting step S105, the terminals 2 connected to the core wires 4 of the cable 3 are cut from the carrier 8. That is, the connection portion between the end portion of the core wire 4 of the cable 3 on the connection portion 15 side of the terminal 2 and the carrier 8 is cut and separated. Then, the disconnecting step S105 ends, and the connection method of the terminal 2 and the cable 3 ends.
As described above, the following method of connecting the terminal 2 and the cable 3 may be implemented: the step S105 of cutting the terminal 2 from the carrier 8 is configured as a step of cutting the terminal 2 connected to the core wire 4 of the cable 3 from the carrier 8.
(8) In the above-described embodiment, the method of connecting the terminal 2 and the cable 3 has been described by taking the mode in which the folding-back step S102 is performed after the blanking step S101 is completed and the entire shape of the blank 2A of the terminal 2 is blanked out, but this may not be the case. For example, a punching process of punching out the blank 2A of the terminal 2 from the plate-like metal member may be performed before and after the folding process S102.
Fig. 19 is a flowchart for explaining a method of connecting the terminal 2 and the cable 3 according to the modification. The connection method of the terminal 2 and the cable 3 according to the modification shown in fig. 19 is configured in the same manner as the connection method of the terminal 2 and the cable 3 according to the embodiment. However, the structure of the punching step (S101A, S B) of the method of connecting the terminal 2 and the cable 3 according to the modification is different from the punching step S101 of the method of connecting the terminal 2 and the cable 3 according to the above-described embodiment. In the following description of the method of connecting the terminal 2 and the cable 3 according to the modification, the structure of the punching process (S101A, S B) different from that of the above-described embodiment will be described, and the same reference numerals or the same reference numerals will be given to the same structures or corresponding structures as those of the above-described embodiment, so that the repetitive description will be omitted.
In the method of connecting the terminal 2 and the cable 3 according to the modification, a first punching step S101A and a second punching step S101B are provided as a punching step (S101A, S101B) of punching out the blank 2A of the terminal 2 from a plate-like metal member. The first punching step S101A and the second punching step S101B are performed before and after the folding step S101. That is, first, the first punching step S101A is performed, the folding step S102 is performed when the first punching step S101A is completed, and the second punching step S101B is performed when the folding step S102 is completed.
The first punching step S101A includes the steps of: the press-fit portion blank portion 16A in the blank 2A of the terminal 2 is punched out of a plate-like metal using a press die configured as a die. Alternatively, the first punching step S101A is configured as follows: and punching out the press-bonded blank portion 16A and the connecting portion blank portion 17A of the blank 2A of the terminal 2 from the plate-shaped metal member using a press die configured as a die. At the time of the first blanking process S101A, the press-bonded blank portions 16A in the blank 2A of the terminal 2 are formed in a state of being aligned along the carrier 8. Alternatively, in the first blanking process S101A, the portion of the blank 2A of the terminal 2, in which the press-fit blank portion 16A and the joint blank portion 17A are integrally formed, is formed in a state of being aligned along the carrier 8.
After the first punching step S101A is completed, the folding step S102 is performed. In the folding-back step S102, the edge portion on the distal end side of the press-bonded blank portion 16A formed in the first blanking step S101A is bent in a folding-back manner to form the core wire leading-out end portion 21 provided with the curved surface portion 22.
When the folding step S102 is completed, the second punching step S101B is performed. The second punching step S101B is configured as follows: the connecting portion blank portion 17A and the connecting portion blank portion 15A in the blank 2A of the terminal 2 are punched out of a plate-like metal using a press die configured as a die. Alternatively, the second punching step S101B is configured as follows: the connection portion blank portion 15A in the blank 2A of the terminal 2 is punched out from a plate-like metal member using a press die configured as a die. In the case where only the press-fit portion blank portion 16A is blanked in the first blanking step S101A, the connecting portion blank portion 17A and the connecting portion blank portion 15A are blanked in the second blanking step S101B. On the other hand, in the case where the press-fit blank portion 16A and the joint blank portion 17A are punched in the first punching step S101A, only the joint blank portion 15A is punched in the second punching step S101B.
When the second blanking process S101B is performed, the blanking of the blank 2A of the terminal 2 having the press-contact portion blank portion 16A, the connecting portion blank portion 17A, and the connecting portion blank portion 15A is completed. The blank 2A of the terminal 2 formed by the end of the second blanking process S101B is joined to the carrier 8 at the joint blank portion 15A, and is formed in a state of being aligned along the carrier 8. In the blank 2A of the terminal 2 formed by the end of the second punching step S101B, the core wire leading end portion 21 provided with the curved surface portion 22 is formed at the edge portion of the tip end side of the press-fit portion blank portion 16A.
After the second punching step S101B is completed, the slitting and raising step S103, the bending step S104, the separating step S105, the core wire arrangement step S106, the connecting portion forming step S107, and the crimping step S108 are performed. This ends the method of connecting the terminal 2 and the cable 3 according to the modification.
As described above, the punching process (S101A, S B) of the blank 2A for punching out the terminal 2 may be performed before and after the folding process S102. That is, the following modes may be implemented: as the blanking process (S101A, S B), a first blanking process S101A, which is performed before the folding-back process S102, to blank at least the press-bonded portion blank portion 16A, and a second blanking process S101B, which is performed after the folding-back process S102, to blank at least the connection portion blank portion 15A, are performed, thereby completing the overall shape of the blank 2A of the terminal 2. According to this aspect, in the folding-back step S102, the core wire leading end 21 can be formed by folding back the edge portion of the press-fit portion blank 16A in a state where only the press-fit portion blank portion 16A is formed in the plate-shaped metal or in a state where only the press-fit portion blank portion 16A and the connecting portion blank portion 17A are formed in the plate-shaped metal. Therefore, the folding-back step S102 of folding back the edge portion of the press-bonding portion blank portion 16A to form the core wire leading-out end portion 21 can be performed in a more stable state. This can further improve the productivity of the folding step S102.
[ Industrial applicability ]
The present invention can be widely applied to a terminal connected to a core wire at a distal end portion of a cable, and a method for connecting a terminal to a cable.

Claims (6)

1. A terminal connected to a core wire of a distal end portion of a cable, comprising:
a connection unit that is connected to a connection object to which the cable is connected via the terminal; and
a pressure-bonding section integrally connected to the connection section and pressure-bonded to the core wire,
the crimping portion has a core wire surrounding portion provided so as to circumferentially surround an outer periphery of the core wire,
a curved surface portion extending in an arc shape from the inside to the outside of the core wire surrounding portion is provided at the core wire leading end portion, which is an end portion of the crimping portion on the opposite side to the side integrally connected to the connecting portion, along the edge portion of the core wire surrounding portion, the end portion being an end portion of the crimping portion on the side from which the core wire is led out and extended,
the curved surface portion is provided as a surface of a folded portion formed by folding back and overlapping plate-like portions constituting the core surrounding portion at the core lead-out end portion, and is provided to extend in a semicircular shape from the inside to the outside of the core surrounding portion.
2. The terminal of claim 1, wherein the terminal is configured to receive the terminal pin,
the curved surface portion is provided as a surface of a folded portion formed by arranging the plate-like portion in a state folded back from the inside toward the outside of the core wire surrounding portion at the core wire leading end portion so as to overlap.
3. A terminal according to claim 1 or 2, wherein,
the object to be connected is a substrate,
the connection portion is provided in a tubular shape covering the core wire from the outside, and is configured to be soldered with the substrate in a state of being inserted into a through hole provided in the substrate.
4. A method for connecting a terminal to a cable, which connects the terminal according to claim 1 or 2 to the cable,
the connection method of the terminal and the cable comprises the following steps:
a blanking step of blanking a blank of the terminal from a plate-like metal member;
a folding-back step of forming the core wire leading-out end portion provided with the curved surface portion by folding back an edge portion of a press-contact portion blank portion that is a blank portion of the press-contact portion;
a core wire arrangement step of arranging the core wire of the terminal portion of the cable to the crimp portion formed by bending the crimp portion blank portion and in a state before crimping the core wire; and
And a crimping step of clamping and pressing the crimping portion on which the core wire is arranged with a die for crimping portion having an upper die and a lower die, thereby bringing the core wire into a state of being crimped at the crimping portion.
5. The method of connecting a terminal to a cable as claimed in claim 4,
the die for crimping part comprises: a first tooth mold portion which clamps and presses the core wire surrounding portion; and a second tooth mold portion which clamps and presses the core wire extraction end portion.
6. The method of connecting a terminal to a cable as claimed in claim 5,
the first tooth mold portion and the second tooth mold portion are provided separately from each other,
in the crimping step, the first tooth mold portion and the second tooth mold portion are used in a state of being overlapped.
CN202210101360.5A 2021-01-29 2022-01-27 Terminal and method for connecting terminal and cable Active CN114824854B (en)

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CN116979340A (en) * 2023-08-03 2023-10-31 广州煜立光电科技有限公司 Manufacturing method of electric connection terminal and electric connection terminal manufactured by same

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US1331928A (en) * 1916-12-04 1920-02-24 Gen Electric Connector
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JPS5727668U (en) * 1981-03-12 1982-02-13
US4531807A (en) * 1981-06-11 1985-07-30 L'electricfil Industrie Bent terminal for electrical connection
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