JP2005222749A - Connector for coaxial cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector for coaxial cable securing the strength of a component members, enabled to reduce the size and weight thereof. <P>SOLUTION: The connector PC, to be fitted to end parts of a plurality of coaxial cables 20 arrayed in parallel on a plane, is provided with a cable-holding member 2 as well as a contact holding member 6, and a shield cover 3 as well as a ground plate 7 fitted to cover a top and bottom faces of the both holding members 2, 6, and is so structured that grounding connection parts 23a of the coaxial cables 20 get connected with at least either the shield cover 3 or the ground plate 7. A plurality of engagement concave grooves 7d accepting the ground connection parts 23a by the plural number in parallel are formed on the ground plate 7, and a plurality of engagement protrusions 3a inserted in and engaged with the respective plurality of concave grooves 7d are formed on the shield cover 3, so that the plurality of ground connection parts 23a are to be held in the concave grooves 7d by having the engagement protrusions 3a inserted in the concave grooves 7d for engagement, with the respective plurality of ground connection parts 23a accepted in the concave grooves 7d. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connector structure connected to an end of a coaxial cable. More specifically, the present invention relates to a connector structure that is attached to the ends of a plurality of coaxial cables arranged in a line, such as a flat cable.

  The coaxial cable is generally configured by disposing a core wire that is two conductive paths and a shield wire (also referred to as a shield layer) in a general electric wire, and specifically, a core wire on a central axis. The inner insulating coating, the laterally wound shield wire, and the outer insulating coating on the same circle as the core wire are arranged in the radial direction from the axis. The flat cable is formed by adhering and holding the coaxial cable in a state of being arranged in parallel on the same plane with a holding tape or the like. In the connector used to connect the flat cable, the core wire of each coaxial cable forming the flat cable is connected to the contact, and the shield wire is a ground member (for example, the shield cover 3 and the ground plate 7 in the embodiment). Connected to.

  At this time, there is a connector for connecting each shield wire to the ground member by crimping connection (for example, Patent Document 1 and Patent Document 2). The crimping connection is a method of electrically connecting to a metal piece and fixing the coaxial cable at a portion where the shield wire is exposed by sandwiching and caulking the cable with a pair of protruding metal pieces having conductivity. .

  In the connectors disclosed in Patent Literature 1 and Patent Literature 2, a plurality of terminal contacts for ground contact projecting in a comb-teeth shape corresponding to the arrangement pitch of the coaxial cable on the shield plate made of a metal material protrudes. A concave pressure contact groove for receiving the coaxial cable is formed between the comb-shaped receiving portions. Each coaxial cable is fixed by engaging the coaxial cable in the recessed groove, and the inner wall of the recessed groove and the shielded wire of the coaxial cable are connected to perform electrostatic shielding by each shielded wire. It has become.

JP 2003-319441 A JP 2003-331993 A

  By the way, in recent years, with the rapid increase in functionality, lightness, thinness and miniaturization found in electronic devices such as mobile phones and laptop computers, there are increasing demands for multipolar connectors, narrower pitches, and smaller and lighter connectors mounted on these electronic devices. ing. However, according to the connectors disclosed in Patent Documents 1 and 2, the shield plate is formed with a comb-shaped receiving portion and a groove so as to receive one coaxial cable with respect to one groove, Increasing the number of poles of the connector increases the number of comb-shaped receiving portions, and the external size of the connector tends to increase in the pitch direction. The problem of not having occurred.

  In addition, for example, a method of narrowing the outer size of the connector by forming each comb-shaped receiving portion narrower than the pitch direction is also conceivable. Since it is difficult to maintain the strength to resist the pressing force and squeezing applied when fitting and detaching the groove, the comb-shaped receiving part may be deformed or damaged, providing a reliable product There is a problem that you can not.

  In view of the above problems, an object of the present invention is to provide a connector that can secure the strength of the constituent members and can reduce the size and weight of the connector.

  In order to achieve the above object, the present invention provides a connector that is attached to the ends of a plurality of coaxial cables arranged in parallel on a plane, and the coaxial cables are arranged around the core wire positioned on the central axis. A first insulating coating, a shield wire, and a second insulating coating are formed to surround the holding member made of an insulating material, contacts attached to the holding member, and a first made of a metal material that covers the upper and lower surfaces of the holding member. 1 and a second cover, the core wire of the coaxial cable is connected to the contact, and the shield wire is connected to at least one of the first and second covers. A plurality of concave grooves for receiving a plurality of coaxial cable ground connection portions in a state where the second insulation coating is peeled off and the shield wire is exposed are formed in the first cover, and enter into the plurality of concave grooves, respectively. A plurality of engaging protrusions are formed on the second cover, and the engaging protrusions are received in the recessed grooves in a state where a plurality of coaxial cable ground connection portions are arranged and received in the recessed grooves. A plurality of coaxial cable ground connection portions are held in the recessed groove by rush engagement.

  The first cover is coupled to the holding member, the second cover is attached to the holding member so as to be relatively slidable, and a plurality of coaxial cable ground connection portions are arranged in the plurality of concave grooves of the first cover, respectively. In this state, it is preferable that the second cover is slid with respect to the holding member so that the plurality of engaging protrusions are plunged into each of the plurality of concave grooves.

  In addition, it is preferable to form the bottom part of a ditch | groove in the waveform matched with the external shape lower part in the state which arranged the several coaxial cable ground connection part received by a ditch | groove.

  In addition, the inner width of the concave groove is formed to be approximately equal to the length in the arrangement pitch direction in a state where a plurality of coaxial cable ground connection portions received in the concave groove are arranged, and the width of the inlet portion of the concave groove Is formed narrower than the inner width, and it is preferable that the engaging protrusion that has entered and engaged with the concave groove is wider than the inlet and does not go out through the inlet. .

  According to the connector of the present invention, a plurality of coaxial cable ground connection portions in a state where the second insulation coating is peeled off and the shield wire is exposed are received in the concave groove formed in the first cover, and the second cover is received. By engaging the formed engaging protrusions into the concave grooves, the shield wire is held in the concave grooves and can be connected to the first or second cover. The number of the comb-like terminal receiving portions protruding from both side edges of the groove can be reduced. Accordingly, the external size of the connector can be narrowed in the pitch direction as compared with the conventional connector configured to receive and hold the ground connection portions of the plurality of coaxial cables forming the flat cable in separate grooves. At the same time, the connector can be reduced in weight. In addition, since it can be manufactured without changing the pitch direction size of the terminal receiving portion from the conventional one, it is possible to maintain the strength against the load applied when the coaxial cable and the concave groove are fitted and removed. It is possible to reduce the outer size of the.

  Further, the first cover is provided in combination with the holding member, and the second cover is attached to the holding member so as to be slidable relative to each other. The coaxial cable can be fixed at the same time, and the processing steps required to connect the coaxial cable into the connector can be greatly reduced. Furthermore, since the engaging protrusion and the surface of the ground connection portion slide relative to each other as the second cover slides, the wiping effect can be exerted on the sliding surface. In addition, it is possible to improve contact reliability against foreign matters such as dust and dust.

  Further, the bottom of the concave groove is formed in a wave shape in which a semicircular arc having a depression below is continuous so as to align with the lower part of the outer shape in a state where the cylindrical ground connection portions are arranged. For this reason, each of the plurality of ground connection portions received in the concave groove engages with the semicircular arc portion that is recessed downward, so that the positioning of the ground connection portion can be performed as compared with the case where the bottom portion is formed flat. It is more rigid and can be fixed in a state of being in close contact with the recessed groove, and the ground contact area of the ground connection portion can be increased. Therefore, the electrostatic shielding effect of each ground connection portion received in the concave groove is effectively exhibited, and harm due to electrostatic noise can be suppressed.

  In addition, the inner width of the groove is formed to be approximately equal to the length in the pitch direction in a state where a plurality of ground connection portions that receive the groove are arranged, and the inlet of the groove is formed to be narrower than the inner width. The engaging protrusion is formed to be wider than the inlet. As a result, the engaging protrusion that has entered the concave groove does not go outward through the inlet portion, and the coaxial cable can be firmly fixed and held in the concave groove. Further, it is possible to prevent the engaging protrusion from engaging with the concave groove and the first and second covers are firmly coupled, and the cover can be prevented from bulging outward and being deformed at this portion.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Before describing the coaxial connector according to the present invention, the structure of a flat cable connected to the connector will be described with reference to FIGS. As shown in FIG. 2 (A), the flat cable FC is configured by adhering and holding a plurality of micro coaxial cables 20 in close contact in parallel on the same plane with a holding tape 27. The holding tape 27 may sandwich the plurality of coaxial cables 20 from both sides, or may be provided only on one side.

  The structure of each coaxial cable 20 is shown in FIG. 2 (B). An inner insulating coating (first first) made of an insulating material is provided around a core wire 21 formed by bringing a plurality of (seven in this case) extra fine wires into contact with each other. Insulating coating) 22 is provided, and a shield wire 23 is provided on the outer periphery of the inner insulating coating 22, in which a plurality of extra fine wires are horizontally wound and provided in a cylindrical shape. The coaxial cable 20 is configured by providing a second insulation coating 24. The coaxial cable 20 has a very thin diameter. For example, the outer diameter of the core wire 21 is about 0.1 mm, and the entire outer diameter (outer diameter of the outer insulating coating 24) is about 0.3 mm. .

  In order to be able to connect the end of the flat cable FC having such a configuration as it is to the connector according to the present invention, a process of forming and molding the end of the flat cable FC will be described below. First, as shown in FIG. 2A, the holding tape 27 is peeled off at the end portion of the flat cable FC, and the end portion of the coaxial cable 20 is exposed while being in close contact in parallel. Then, a process of cutting only the outer insulating coating 24 and the shield wire 23 is performed by irradiating the YAG laser at a position of the first predetermined distance a from the end face of the coaxial cable 20.

  Then, when the outer end side is pulled out from the cut position in the coaxial cable 20 by sticking a holding tape to a portion on the outer end side from the cut position, the outer insulating coating 24 and the shield are removed. Only the line 23 can be removed away from the cutting position. FIG. 3A shows a state in which the outer insulating coating 24 and the shield wire 23 on the outer end side have been removed from the cutting position in this way, and as can be seen from this drawing, between the tip and the cutting position, The inner insulating coating 22 is exposed. The portion where the inner insulating coating 22 is exposed in this way is referred to as a pressure contact portion 22a.

Next, the cutting position (i.e., the inner end position of the contact portion 22a) in a range from up to the second predetermined distance b, is irradiated with a CO ₂ laser to melt remove the outer insulating coating 24. As a result, as shown in FIG. 3B, the inner insulating coating 22 is exposed by a first predetermined distance a from the front end side to form a pressure contact portion 22a, and a second predetermined distance b is formed from the inner end side. The shield wire 23 is exposed within the range. The portion where the shield wire 23 is exposed in this way is referred to as a ground connection portion 23a. Here, by removing the outer insulating coating 24, the ground connection portions 23a are arranged at equal intervals with a predetermined interval c equal to twice the thickness of the outer insulating coating 24 as shown in FIG. 3B. The

  A coaxial cable connector (hereinafter also referred to as a plug connector PC or a connector PC) according to the present invention is attached to the end portion of the flat cable FC in which the end portion is processed as described above. A process of connecting the flat cable FC to the configuration and the plug connector PC will be described with reference to FIGS. 1 and 4 to 6.

  First, the structure of the plug connector PC connected to the end of the flat cable FC having the above configuration will be described. The plug connector PC is composed of a pressure contact cover 1 and a connector main body 5 as shown in an exploded view in FIG. 1, and the end of the flat cable FC is attached to the pressure contact cover 1 as shown in FIG. The pressure cover 1 is pressed toward the connector body 5 in the direction of the arrow A, the pressure cover 1 is coupled to the connector body 5 as shown in FIG. 5, and the shield cover 3 is moved to the arrow B as shown in FIG. A plug connector PC that is slid in the direction and connected to the flat cable FC is manufactured. Note that FIG. 1 does not conform to the plug connector PC assembly process and the flat cable FC connection process shown in FIGS. 4 to 6, and the end of the flat cable FC is described later as a concave groove 7 d (FIG. 7) for convenience. (See Fig. 1).

  As shown in FIGS. 1 and 4, the pressure contact cover 1 constituting the plug connector PC is made of an insulating material cable holding member (holding member) 2 and a metal material attached to cover the outer surface of the cable holding member 2. And a shield cover (second cover) 3.

  In the cable holding member 2, a plurality of U-shaped cable holding grooves 2a and 2b arranged in the same pitch as the arrangement pitch of the coaxial cables 20 of the flat cable FC extend in the front-rear direction and in the left-right direction. Are aligned with each other. The cable holding member 2 is further formed with a press contact terminal receiving groove 2c extending in the left-right direction, and a plurality of ground terminal receiving holes 2d positioned side by side with the cable holding grooves 2a and 2b as shown in the figure. Is formed.

  The shield cover 3 is attached so as to cover the upper surface of the cable holding member 2, and a plurality of engagement protrusions 3 a folded back in a U shape on the rear side are arranged two by two in close contact with the coaxial cable 20. Are arranged in the left-right direction at a pitch corresponding to the arrangement pitch in the above state. A first locking arm 3b and a second locking arm 3c bent at a right angle are formed on the left and right ends of the shield cover 3 as shown in the figure, and the second locking arm 3c is connected to the cable holding member 2. The shield cover 3 is attached to the cable holding member 2 by engaging. At this time, the second locking arm 3 c is slidably locked back and forth with respect to the cable holding member 2, and the shield cover 3 can be moved back and forth relative to the cable holding member 2.

  On the other hand, the connector main body 5 includes a contact holding member (holding member) 6 made of an insulating material, and a ground plate (first cover) made of a metal plate that is integrally insert-molded so as to cover the lower surface of the contact holding member 6. ) 7 and a plurality of contacts 8 that are similarly insert-molded and held by the contact holding member 6.

  The contacts 8 are arranged side by side in the left-right direction at the same pitch as the arrangement pitch of the coaxial cables 20 of the flat cable FC, and the rear end thereof is bent upward at a right angle to form a pressure contact terminal portion 8a. A core wire receiving groove 8b is formed in the press contact terminal portion 8a. The core wire receiving groove 8b is open upward and has a width slightly smaller than the diameter of the core wire 21 of the coaxial cable 20.

  The ground plate 7 covers the lower surface of the contact holding member 6, but the rear end thereof is bent upward at a right angle, and a plurality of ground terminal receiving portions 7 a are arranged in the left-right direction at the same pitch as the arrangement pitch of the engaging projections 3 a. It is formed in a comb-like shape. The shapes of these ground terminal receiving portions 7a are shown in FIG. 7, each having a pair of left and right receiving arms 7b, 7b, and a concave groove 7d opened upward is formed between the receiving arms 7b, 7b. In addition, an upper end of each receiving arm 7b is formed with an inlet portion 7c that expands in an elliptical shape.

  The concave groove 7d is formed so as to be capable of receiving two ground connection portions 23a, and the bottom of the concave groove 7d has two semicircular arcs recessed downward in accordance with the lower outer shape of the cylindrical ground connection portion 23a. It is formed in a continuous wave shape. The inner width of the concave groove 7d in which the bottom portion is formed in this way is formed to be approximately equal to the width in the pitch direction when two coaxial cables 20 with the shield wire 23 exposed are arranged side by side. The distance 7c is formed narrower than the inner width of the concave groove 7d.

  Here, in order to connect the end portion of the flat cable FC to the plug connector PC, the coaxial cable of the flat cable FC is first shown in FIG. The front end portion of the flat cable FC is attached to the press contact cover 1 with the press contact portion 22a at 20 being received in the cable holding grooves 2a and 2b.

  From this state, the pressure contact cover 1 is pressed toward the connector body 5 in the direction of arrow A. Thereby, as shown in FIG. 5, the press contact terminal portion 8a bites into the press contact portion 22a while tearing the inner insulating coating 22 of the press contact portion 22a, and the core wire 21 is inserted into the core wire receiving groove 8b so that the core wire 21 corresponds to the contact. 8 is electrically connected. At the same time, the ground connection portion 23a of the coaxial cable 20 pushes the receiving arms 7b, 7b of the ground terminal receiving portion 7a outward and is pushed into the concave groove 7d through the entrance portion 7c to receive and hold. Is done.

  Next, as shown by an arrow B in FIG. 6, the shield cover 3 is pushed and moved relative to the cable holding member 2. As a result, as shown in FIG. 7, the engaging projection 3a slides into the concave groove 7d while sliding on the surface of the ground connection portion 23a, and the two ground connection portions 23a are sandwiched in the concave groove 7d. The ground connection portion 23 a is electrically connected to the shield cover 3 and the ground plate 7.

  In the coaxial cable connector according to the present invention configured by connecting the flat cable FC as described above, the two ground connection portions 23a are received in close contact with each other in the single groove 7d. Composed. For this reason, it is possible to reduce the number of comb-like ground terminal receiving portions 7a formed on both side edges of the concave groove 7d to about half, and to reduce the external size of the connector in the pitch direction, Can be reduced in weight. In addition, since the connector for coaxial cables according to the present invention can be manufactured without changing the pitch direction size of the ground terminal receiving portion 7a from the prior art, the load load generated when the ground connection portion 23a and the recessed groove are fitted and removed is reduced. The outer size of the connector can be narrowed while maintaining the strength to resist.

  Further, the ground plate 7 is provided in combination with the contact holding member 6, and the shield cover 3 is configured to be slidably attached to the cable holding member 2, thereby performing a one-step operation of sliding the shield cover 3. Only a plurality of coaxial cables 20 can be fixed at the same time, and the processing steps required to connect the coaxial cables 20 into the connector PC can be greatly reduced. Further, since the lower surface of the engaging projection 3a and the surface of the ground connection 23a slide relative to each other as the shield cover 3 slides, the wiping effect is exerted on the sliding surface. It is possible to improve the contact reliability against foreign matters such as dust and dust.

  Further, as shown in FIG. 7, the bottom of the concave groove 7d is formed in a wavy shape that matches the lower portion of the outer shape in a state where two ground connection portions 23a received in the concave groove 7d are arranged. For this reason, the ground connection portion 23a is engaged with the wave-shaped bottom portion, so that the positioning of the ground connection portion 23a can be more firmly fixed and fixed in a state of being in close contact with the concave groove 7d. The ground area of the ground connection portion 23a can be increased. Thereby, the electrostatic shielding effect of each shield wire 23 can fully be exhibited, and the harm by electrostatic noise can be suppressed.

  Further, the inner width of the concave groove 7d is formed to be substantially equal to the length in the pitch direction in a state in which the plurality of received ground connection portions 23a are arranged, and the inlet portion of the concave groove 7d is made larger than the inner width thereof. The engaging projection 3a is formed to be narrower than the inlet. As a result, the engaging projection 3a that has entered the concave groove 7d does not go outward through the inlet, and the coaxial cable 20 can be firmly fixed and held in the concave groove 7d. In addition, since the engaging protrusion 3a is engaged with the ground terminal receiving portion 7a as described above, the shield cover 3 and the ground plate 7 are firmly coupled at this portion, and the shield cover 3 and the ground plate 7 are also joined. Can be prevented from bulging outward and deforming.

  In the above-described embodiment, the two ground connection portions 23a are received in the concave groove 7d. However, three or more ground connection portions may be received. By doing so, since the number of necessary grooves is reduced, the number of ground terminal receiving portions 7a forming the grooves can be reduced, and the external size of the connector can be further reduced. it can.

It is a perspective view which shows the state which decomposed | disassembled the press-contact cover and connector main body of the connector for coaxial cables which concern on this invention. It is a top view of the flat cable to which the said connector for coaxial cables is attached, and a perspective view which shows the structure of the coaxial cable which comprises this flat cable. It is a top view which shows the edge part structure of the said flat cable in the process middle stage for attaching to the said connector for coaxial cables, and the state in which the process was given. It is sectional drawing which shows the state in the middle stage when connecting the edge part of the said flat cable to the connector for coaxial cables which concerns on this invention. It is sectional drawing which shows the state in the middle stage when connecting the edge part of the said flat cable to the connector for coaxial cables which concerns on this invention. It is sectional drawing which shows the state which connected the edge part of the said flat cable to the connector for coaxial cables which concerns on this invention. It is sectional drawing shown along the arrow VII-VII shown in FIG.

Explanation of symbols

FC flat cable PC plug connector 1 pressure contact cover 2 cable holding member (2a, 2b cable holding groove, 2c pressure contact terminal receiving groove, 2d ground terminal receiving hole)
3 Shield cover (3a engagement protrusion, 3b, 3c locking arm)
5 Connector body 6 Contact holding member 7 Ground plate (7a ground terminal receiving portion, 7b receiving arm, 7c inlet portion, 7d concave groove)
8 contacts (8a pressure contact terminal, 8b core wire receiving groove)
20 Coaxial cable 21 Core wire 22 Inner insulation coating (22a pressure contact part)
23 Shield wire (23a Ground connection)
24 Outer insulation coating 27 Holding tape

Claims (4)

A connector attached to the ends of a plurality of coaxial cables arranged in parallel on a plane,
Each of the coaxial cables is formed by surrounding a core wire located on the central axis with a first insulation coating, a shield wire, and a second insulation coating,
The core member of the coaxial cable includes a holding member made of an insulating material, a contact attached to the holding member, and first and second covers made of a metal material attached to cover both upper and lower surfaces of the holding member. Is connected to the contact and the shield wire is connected to at least one of the first and second covers,
A plurality of concave grooves for receiving the plurality of coaxial cable ground connection portions in a state where the second insulating coating is peeled off and the shield wire is exposed are formed in the first cover, and the plurality of concave grooves are formed in the first cover. A plurality of engaging protrusions that respectively enter and engage with the second cover,
With the plurality of coaxial cable ground connection portions arranged and received in the concave grooves, the engaging protrusions are plunged into the concave grooves to connect the plurality of coaxial cable ground connections in the concave grooves. A connector for a coaxial cable, wherein the connector is configured to hold a portion. The first cover is provided in combination with the holding member, and the second cover is attached to the holding member so as to be relatively slidable;
The plurality of engaging protrusions are slid with respect to the holding member in a state in which the plurality of coaxial cable ground connection portions are arranged and received in the plurality of concave grooves of the first cover, respectively. 2. The coaxial cable connector according to claim 1, wherein the portion is configured to enter and engage with each of the plurality of concave grooves.   The bottom of the concave groove is formed in a wave shape that matches the lower part of the outer shape in a state in which the plurality of coaxial cable ground connection portions received in the concave groove are arranged. The connector for coaxial cables according to 2. The internal width of the concave groove is formed to be approximately equal to the length in the arrangement pitch direction in a state in which the plurality of coaxial cable ground connection portions received in the concave groove are arranged,
The width of the inlet portion of the concave groove is formed narrower than the internal width,
4. The engagement projection portion that has entered and engaged with the inside of the concave groove is wider than the inlet portion, and is configured not to go outward through the inlet portion. The connector for coaxial cables in any one of.

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