JP2004362880A - Connection structure and connection method of contact pin for connector and coaxial cable with small diameter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely connect a coaxial cable with a small diameter without using solder. <P>SOLUTION: A contact pin 18, made of one piece of conductive member, has a contact part 24 at one end side and a connection part 26 of the coaxial cable with a small diameter 20 at the other end side. The connection part 26 is composed of a housing part 28 of which one end is connected to the contact part 24, and a pressing piece 30. The housing part 28, formed into convex shape with opened upper part, has a bottom face part 28a and a pair of vertical walls 28b. The pressing part 30, composed of a main body part 30a, upper folded parts 30b, and positioning protrusions 30c, is fitted and pressed from the upside of the open end so as to widen the open end of the housing part 28 in a state that a core wire 20a of a coaxial cable 20 with the small diameter is put on the bottom face of the housing part 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure and a connection method between a connector contact pin and a small diameter coaxial cable.
[0002]
[Prior art]
Conventionally, a flexible cable that can be bent and deformed has been used as an electrical connection between the body of a portable personal computer and a display such as an LCD, or the body of a mobile phone and a display unit.
[0003]
However, for example, in the case of a mobile phone, the folding system has become the mainstream, and the number of times of bending has increased many times. In the case of a flexible cable, the risk of disconnection has increased with the increase in the bending frequency.
[0004]
Therefore, recently, as a means for connecting such devices, the existence of a known document has not been confirmed, but a method using a thin coaxial cable having a core wire diameter of 0.09 mm has been provided at an actual manufacturing site. I have.
[0005]
In the electrical connection means using such a small-diameter coaxial cable, the coaxial cable is usually used by being connected to a connector. In this case, the electrical connection between the contact pins of the connector and the core wire of the coaxial cable has been performed by soldering.
[0006]
However, such a conventional connecting means between a coaxial cable and a contact pin has a technical problem described below.
[0007]
[Problems to be solved by the invention]
That is, for example, when connecting a coaxial cable between a personal computer and a display such as an LCD, about 20 coaxial cables are soldered to the same number of contact pins.
[0008]
In this case, since the diameter of the core wire of the coaxial cable is small, the arrangement interval of the contact pins of the connector is also narrow, and is usually about 1 mm. When soldering coaxial cables to such contact pins, multiple coaxial cables corresponding to the number of contact pins are adhered to tape, etc. according to the arrangement interval of the contact pins in consideration of manufacturing efficiency. Preliminary soldering is applied to the core wire from which the insulation coating has been stripped, and the core wire is brought into contact with the end of the contact pin. And make solder connections.
[0009]
However, in such a solder connection, since the amount of the preliminary solder applied to the core wire in advance varies and becomes non-uniform, the heating conditions are not all the same and the soldering failure is likely to occur.
[0010]
Further, if the preliminary solder is heated to melt it, thermal deformation occurs in the core wire, which is likely to cause soldering failure. If even one soldering failure occurs, many coaxial cables become defective.
[0011]
Furthermore, since soldering usually uses lead-containing solder, there is a bad influence on the environment, and the development of an electrical connection method instead of this is desired.
[0012]
The present invention has been made in view of such conventional problems, and an object thereof is to provide a connector contact pin and a small-diameter connector that can reliably connect a small-diameter coaxial cable without using solder. An object of the present invention is to provide a connection structure and a connection method with a coaxial cable.
[0013]
[Means for Solving the Problems]
Means for Solving the Problems In order to achieve the above object, the present invention provides a conductive member, arranged in a row in a resin housing, provided with a contact portion at one end, and a small-diameter coaxial cable at the other end. In the connector provided with a plurality of contact pins provided with a connecting portion, the connecting portion is connected to the contact portion at one end, a concave receiving portion having an open upper end, and a bottom surface of the receiving portion, In the state where the core wire of the small diameter coaxial cable is placed, the opening end of the housing portion is pushed and widened so as to form a flat pressing piece fitted and press-fitted from above the opening end.
[0014]
According to the connection structure of the connector pin and the small-diameter coaxial cable configured as described above, the connection portion of the small-diameter coaxial cable has one end connected to the contact portion and a concave housing portion having an open upper end, With the core wire of the small-diameter coaxial cable placed on the bottom surface, the open end of the housing portion is spread out, and is configured by a flat pressing piece fitted and press-fitted from above the open end. Therefore, the electrical connection between the contact pin and the small-diameter coaxial cable is secured by the following operation.
[0015]
That is, first, in a state where the core wire of the small-diameter coaxial cable is placed on the bottom surface of the concave receiving portion whose upper end side is open, the opening end of the receiving portion is spread out, and the pressing piece is pushed from above the opening end. When the fitting and press-fitting is performed, when the opening ends on both sides of the housing portion are pushed open, an acting force acts on the bottom surface of the housing portion in a direction in which a central portion thereof swells and deforms upward.
[0016]
On the other hand, a reaction force that pushes the pressing piece back from both sides from the opening end side acts on the pressing piece fitted and press-fitted from above the opening end in such a manner that the opening end of the housing portion is pushed open. On the pressing piece that has received such a reaction force, an acting force acts in a direction in which a central portion of the pressing piece tends to swell and deform downward.
[0017]
Each of these acting forces acts on the core wire of the small-diameter coaxial cable sandwiched between the accommodating portion and the pressing piece. It is pressed against the bottom surface of the receiving portion and the pressing piece, thereby ensuring electrical connection.
[0018]
Such an operating force is maintained as long as the pressing piece does not separate from the opening end of the housing portion, so that the electrical connection can be ensured for a long time.
[0019]
The housing portion includes a bottom portion, a pair of vertical walls that are erected at both ends of the bottom portion, and are formed at an upper end to form the open end, and the vertical wall is formed from a vertical surface with respect to the bottom portion. They can be inclined in directions approaching each other.
[0020]
In the housing portion, the contact portion may be connected to one open end side, and a slit for positioning the coaxial cable may be provided in a central portion of the other open end.
[0021]
The pressing piece is provided with a substantially rectangular flat plate-shaped main body, and a pair of upper folded portions provided at both ends in the longitudinal direction of the main body and abutting on the opening end, in the widthwise direction of the main body. Positioning projections of the core wire can be provided at both ends.
[0022]
The upper folded part may be inclined in a direction in which a tip thereof is separated from a vertical plane to the main body part.
[0023]
In addition, the present invention is configured such that a contact portion is provided on one end side and a connection portion for a small diameter coaxial cable is provided on the other end side while being formed of a conductive member and arranged in a row in a resin housing. In the method for connecting the contact pin and the small-diameter coaxial cable in a connector having a plurality of contact pins, the connection portion has one end connected to the contact portion and a concave receiving portion having an open upper end, and an opening end. A flat pressing piece fitted and press-fitted from above, and in such a state that the core end of the small-diameter coaxial cable is placed on the bottom surface of the housing portion, the opening end of the housing portion is pushed open. Then, the pressing piece was fitted and press-fitted, and the core wire was sandwiched between the housing portion and the pressing piece.
[0024]
According to the connecting method of the connector contact pin and the small-diameter coaxial cable configured as described above, the contact pin and the small-diameter coaxial cable are connected to each other by the action force generated between the housing portion and the pressing piece, similarly to the connection structure described above. Electrical connection between the two.
[0025]
The small-diameter coaxial cable is arranged and supported in a row in correspondence with the number of contact pins, in a state where the insulating coating is peeled off, so that the core wire is exposed, and the pressing pieces are equal to the number of contact pins. Correspondingly, one end side is arranged and supported in a row on the support plate, and after each core wire of the coaxial cable is placed on the bottom surface of the receiving portion of the contact pin, each of the pressing pieces is fitted to the receiving portion. After press-fitting, the pressing piece can be cut from the support plate.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 6 show an embodiment of a connection structure and a connection method between a connector contact pin and a small diameter coaxial cable according to the present invention.
[0027]
FIG. 1 is a partially exploded perspective view of a connector 10 to which a connection structure and a connection method of the present invention are applied. The connector 10 includes a housing 12 made of synthetic resin, upper and lower shells 14 and 16 made of metal, and many The contact pins 18 are provided.
[0028]
The upper and lower shells 14 and 16 are detachably fitted and fixed to the upper and lower surfaces of the housing 12. The contact pins 18 are formed of, for example, a conductive member such as a copper alloy, arranged in a line, and held by the housing 12.
[0029]
One small diameter coaxial cable 20 is connected to each contact pin 18. The small-diameter coaxial cable 20 includes a core wire 20a having a diameter of about 0.09 mm, an insulating coating layer 20b, a mesh-like ground wire 20c, and an outer insulating layer 20d.
[0030]
The member indicated by reference numeral 22 in FIG. 1 is a ground bar connected to the ground wire 20 c of the small-diameter coaxial cable 20 arranged in a line, and the ground bar 22 is fitted to the housing 12. .
[0031]
FIG. 2 is an enlarged view of the contact pin 18. The contact pin 18 shown in the figure is made of one conductive member, and has a contact part 24 at one end and a connection part 26 of the small diameter coaxial cable 20 at the other end.
[0032]
The contact portion 24 is formed by bending the distal end side of the conductive member to have a double structure. The distal end side of the double structure is disposed so as to face the fitting hole of the housing 12 of the connector 10. A connection lead such as an LCD is inserted into the gap of the double structure.
[0033]
The connecting portion 26 includes a housing portion 28, one end of which is connected to the contact portion 22, and a pressing piece 30. The housing portion 28 is formed in a concave shape with an open upper end, and has a bottom surface portion 28a and a pair of vertical walls 28b.
[0034]
The bottom surface portion 28a is a substantially rectangular flat surface having a predetermined width and length, and is provided so that a pair of vertical walls 28b are opposed to both ends in the longitudinal direction. The upper ends of the pair of vertical walls 28b form the open ends of the housing portion 28. In the case of the present embodiment, the upper ends are in the directions approaching each other from the vertical plane to the bottom surface 28a, that is, the vertical plane. Are formed so as to be inclined at a predetermined angle inward from the respective sides.
[0035]
In the housing portion 28 configured as described above, a connection portion with the contact portion 22 is provided at a center portion of the vertical wall 28b on one opening end side, and is provided at a center of the vertical wall 28b on the other opening end side. , A concave slit 28c having an open upper end is formed.
[0036]
The slit 28c is used for positioning the core wire 20a of the small diameter coaxial cable 20 when the core wire 20a is placed on the bottom surface portion 28a. On the other hand, the pressing piece 30 is fitted from above the open end so as to push open the open end of the housing part 28 with the core wire 20a of the small diameter coaxial cable 20 placed on the bottom surface of the housing part 28. It is press-fitted, and in the case of the present embodiment, is provided with a main body portion 30a, an upper folded portion 30b, and a positioning protrusion 30c.
[0037]
The main body 30a is a flat plate formed in a substantially rectangular shape, and a pair of upper folded portions 30b are provided at both ends in the longitudinal direction of the main body 30a. The upper folded portion 30b comes into contact with the opening end of the housing portion 28 when the pressing piece 30 is fitted and pressed into the housing portion 28.
[0038]
In the case of the present embodiment, the upper folded portion 30b is formed so that its tip side is inclined at a predetermined angle in a direction away from the vertical surface to the main body portion 30a, that is, outwardly from the vertical surface. I have.
[0039]
The positioning projections 30c are arranged at both ends in the short direction of the main body 30a, and are provided in a pair at a predetermined interval. The core wire 20 of the small diameter coaxial cable 20 is inserted and positioned between the projections 30c. You.
[0040]
2 is a slit provided at the center of one of the upper folded portions 30b of the pressing piece 30, and the slit 30d is bent at the front end side of the core wire 20a of the coaxial cable 20. It is used for positioning inserted. .
[0041]
When connecting the small-diameter coaxial cable 20 to the contact pin 18 configured as described above, first, the core wire 20 a of the small-diameter coaxial cable 20 is placed on the bottom surface 28 a of the housing 28.
[0042]
At this time, the core wire 20a is positioned substantially at the center of the bottom surface portion 28a by being inserted into the slit 28c. Then, in this state, the pressing piece 30 is fitted and press-fitted from above the opening end so as to push open the opening end of the housing portion 28.
[0043]
When the pressing piece 30 is fitted, the core wire 20a is positioned between the protrusions 30c, and the tip of the core wire 20a is bent upward and inserted into the slit 30d. FIG. 3 is an external view when the pressing piece 30 is fitted and press-fitted, and FIG. 4 is a sectional view at that time.
[0044]
With the core wire 20a of the small-diameter coaxial cable 20 placed on the bottom surface of the concave housing portion 28 whose upper end side is open, the opening end of the housing portion 28 is pushed open so that the pressing piece 30 is positioned above the opening end. When the fitting ends are press-fitted from above, when the opening ends on both sides of the housing portion 28 are expanded, an acting force acts on the bottom surface of the housing portion 28 in a direction in which a central portion thereof swells and deforms.
[0045]
On the other hand, a reaction force that pushes the pressing piece 30 back from both sides from the opening end side acts on the pressing piece 30 fitted and press-fitted from above the opening end so as to push open the opening end of the housing portion 28. Then, on the pressing piece 30 which has received such a reaction force, an acting force acts in a direction in which a central portion thereof swells and deforms downward.
[0046]
In this case, in the present embodiment, the vertical wall 28b forming the open end is formed such that the upper end side is inclined at a predetermined angle inward from a vertical plane with respect to the bottom surface 28a.
[0047]
In addition, an upper folded portion 30b is provided at the open end of the housing portion 28, that is, at both ends of the pressing piece 30 that comes into contact with the vertical wall 28b, and the upper folded portion 30b has a distal end that is perpendicular to the main body portion 30a. It is formed so as to be inclined outward.
[0048]
Therefore, when the pressing piece 30 provided with such a folded portion 30b is fitted and press-fitted between the vertical walls 28b, the vertical wall 28b has an upper end formed at a predetermined angle inward from a vertical surface with respect to the bottom surface 28a. Since it is formed so as to be inclined, when the pressing piece 30 is press-fitted, a large force is required to push the inwardly inclined vertical wall 28b outward and spread out, so that the vertical wall 28b When a large force is applied, the acting force for expanding and deforming the bottom surface portion 28a also increases.
[0049]
On the other hand, the reaction force for pushing the pressing piece 30 back from both sides from the opening end side increases in accordance with the magnitude of the acting force, and the reaction force acts on the folded portion 30b of the pressing piece 30. .
[0050]
In this case, since the upper folded portion 30b is formed such that its tip is inclined outward from a vertical plane with respect to the main body portion 30a, the swelling deformation force generated in the pressing piece 30 due to this reaction force is also reduced. It will be big.
[0051]
The respective acting forces of the bulging deformation as described above are such that the core wire 20a is reciprocated with respect to the core wire 20a of the small-diameter coaxial cable 20 held between the housing portion 28 and the pressing piece 30, and Since the pressing force is applied, the core wire 20a is pressed against the bottom surface of the housing portion 28 and the pressing piece 30, thereby securing the electrical connection.
[0052]
Such an operating force is maintained as long as the pressing piece 30 does not separate from the opening end of the housing portion 28, so that the electrical connection can be secured for a long time. When the pressing piece 30 is press-fitted into the housing portion 28, the projection 30c provided on the pressing piece 30 has its tip abutting on the bottom surface 28a to prevent the core wire 20a from being crushed more than necessary. It also has functions.
[0053]
Next, a connection method for efficiently obtaining the above-described connection structure will be described with reference to FIGS. In the connection method of this embodiment, the connection between the contact pin 18 and the small-diameter moving shaft cable 20 is performed by placing the core wire 20 a of the small-diameter coaxial cable 20 on the bottom surface of the housing 28 of the contact pin 18. The basic configuration is that the pressing piece 30 is fitted and press-fitted so that the opening end of the portion 28 is expanded and the core wire 20a is sandwiched between the housing portion 28 and the pressing piece 30.
[0054]
The small-diameter coaxial cables 20 are arranged and supported in a row corresponding to the number of the contact pins 18 with the insulating coating layer 20 peeled off so that the core wire 20a is exposed by a predetermined length.
[0055]
In the example shown in FIG. 5, 20 coaxial cables 20 are arranged and supported in a line by soldering the ground wire 18c to the ground bar 22. The arrangement state of the coaxial cables 20 shown in FIG. 5 is made in a state where two sets are connected to each other, and is cut into two parts by cutting the core wire 20a at the center (indicated by a virtual line in FIG. 5). Separated.
[0056]
On the other hand, the pressing pieces 30 are arranged and supported in one row on the support plate 32 at one end corresponding to the number of the contact pins 18 so that the pressing pieces 30 are one step lower than the main surface of the support plate 32. , Are arranged in a stepped state. The pressing piece 30 and the support plate 32 having such a structure can be manufactured in a state where both are integrated by pressing a metal plate used for the pressing piece 30.
[0057]
When connecting the coaxial cable 20 and the contact pins 18, the necessary number of the contact pins 18 are fitted and fixed to the housing 12 of the connector 10 as shown in FIG. 5.
[0058]
Next, the small-diameter coaxial cables 20 arranged and supported in a line in the ground bar 22 are placed on the accommodation portion 28 of the contact pin 18 as shown in FIG. At this time, the core wire 20a of each small-diameter cable 20 is inserted into the slit 28c of the housing portion 28 and positioned at the center of the bottom surface portion 28a.
[0059]
Each core wire 20a of the small-diameter coaxial cable 20 is bent so that the distal end side is curved upward. Next, as shown in FIG. 6, the support plate 32 holding the pressing pieces 30 is positioned above the housing sections 28, and the pressing pieces 30 are fitted and pressed into the respective housing sections 28.
[0060]
When press-fitting the pressing pieces 30, the core wires 20a are positioned between the protrusions 30c of each pressing piece 30, and the distal end side of each core wire 20a is inserted into the slit 30d to be positioned at a predetermined position.
[0061]
The press-fitting of the pressing piece 30 is performed using a plate-shaped pressing jig 34 as shown in FIG. When the pressing piece 30 is fitted and press-fitted using the pressing jig 34, the pressing piece 30 is cut from the support plate 32. Thereafter, when the upper shell 14 is fitted to the housing 12, the electrical connection between the contact pin 18 of one connector 10 and the coaxial cable 18 is completed.
[0062]
Now, according to the connection method configured as described above, similarly to the connection structure described above, the action force generated between the housing portion 28 and the pressing piece 30 causes the contact pin 18 and the small-diameter coaxial cable 20 to connect with each other. In this embodiment, the electrical connection between the small-diameter coaxial cables 20 can be performed at one time, so that the production efficiency can be improved.
[0063]
【The invention's effect】
As described above in detail, according to the connection structure and the connection method between the connector contact pin and the small-diameter coaxial cable according to the present invention, the connection of the small-diameter coaxial cable can be reliably performed without using solder.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of a connector to which a connection structure between a connector contact pin and a small-diameter coaxial cable according to the present invention is applied.
FIG. 2 is an exploded perspective view of an essential part of FIG. 1;
FIG. 3 is an assembly view of FIG. 2;
FIG. 4 is a longitudinal sectional view of a main part of FIG. 3;
FIG. 5 is an exploded perspective view showing a method for connecting a connector contact pin and a small-diameter coaxial cable according to the present invention. .
FIG. 6 is an extracted diagram of a main part of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Connector 12 Housing 18 Contact pin 20 Small diameter coaxial cable 20a Core wire 22 Ground bar 24 Contact part 26 Connection part 28 Housing part 30 Pressing piece

Claims (7)

A plurality of contact pins formed of a conductive member, arranged in a row in a resin housing, provided with a contact portion on one end side, and provided with a connection portion for a small diameter coaxial cable on the other end side. In the provided connector,
One end of the connecting portion is connected to the contact portion, and a concave receiving portion having an open upper end,
With the core wire of the small-diameter coaxial cable placed on the bottom surface of the housing portion, a flat plate-shaped press fitted and press-fitted from above the open end so as to push open the open end of the housing portion. A connection structure for connecting a contact pin for a connector and a small-diameter coaxial cable, comprising: The housing portion includes a bottom portion, and a pair of opposed vertical walls formed upright at both ends of the bottom portion and forming the open end at an upper end,
The connection structure of a connector pin and a small diameter coaxial cable according to claim 1, wherein the vertical wall is formed to be inclined in a direction approaching each other from a vertical plane with respect to the bottom. The said accommodating part, The said contact part is connected in the one open end side, The slit for positioning of the said coaxial cable is provided in the center part of the other open end, The Claims 1 or 2 characterized by the above-mentioned. Connection structure between connector pin and small diameter coaxial cable. The pressing piece has a substantially rectangular flat plate-shaped main body, and a pair of upper folded portions provided at both ends in the longitudinal direction of the main body and abutting on the opening end,
4. The connection structure between a connector contact pin and a small-diameter coaxial cable according to claim 1, wherein positioning protrusions of the core wire are provided at both ends in the short direction of the main body. The connection structure of a connector pin and a small diameter coaxial cable according to claim 4, wherein a tip of the upper folded portion is inclined in a direction away from a vertical plane to the main body. A plurality of contact pins formed of a conductive member, arranged in a row in a resin housing, provided with a contact portion on one end side, and provided with a connection portion for a small diameter coaxial cable on the other end side. In the method for connecting the contact pin and the small-diameter coaxial cable in the provided connector,
The connection portion has one end connected to the contact portion, a concave housing portion having an open upper end, and a flat pressing piece fitted and press-fitted from above the open end,
With the core wire of the small-diameter coaxial cable placed on the bottom surface of the housing portion, the pressing piece is fitted and press-fitted so as to push open the opening end of the housing portion, and the core wire is inserted into the housing portion. A connector pin and a small-diameter coaxial cable which are sandwiched between the connector pin and the pressing piece. The small-diameter coaxial cable is arranged and supported in a row in accordance with the number of contact pins, in a state where the insulating coating is peeled off, so that the core wire is exposed, and the pressing pieces are equal to the number of contact pins. Correspondingly, one end side is arranged and supported in a row on the support plate,
After placing each core wire of the coaxial cable on the bottom surface of the receiving portion of the contact pin, fitting and press-fitting each of the pressing pieces into the receiving portion, cutting the pressing piece from the support plate. A method for connecting a connector pin and a small-diameter coaxial cable according to claim 6.

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