JP2006344490A - Coaxial connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coaxial connector with a center contact as well as the connector as a whole downsized, and capable of stably retaining the center contact even with thermal shock. <P>SOLUTION: The coaxial connector is provided with a center contact 21 connected to a center conductor 2 of a coaxial cable, an outer contact 22 arranged outside the center contact 21 and connected to an outer conductor 4 of the coaxial cable 1, an inner housing 23 intercalated between the center contact 21 and the outer contact 22 for retaining the center contact 21, and an outer housing 24 for retaining the outer contact 22. The center contact 21 is provided with a pin-like contact part 25, and a widened-diameter barrel part 27 continued from the contact part 25 through a stepped part 26, opened toward a rear end side of the inner housing 23, inserted into a contact insertion hole 49 with a stepped rest part 50 formed at an inner periphery part, and is fixed to the inner housing 23 at a position where the stepped part 26 is made to rest at the rest part 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coaxial connector used for connection between a coaxial cable used for high-frequency transmission or the like and a device substrate.

  As shown in FIG. 6, the coaxial cable 1 used for high-frequency transmission or the like includes a central conductor 2 made of a conductor, an insulator 3 coaxially disposed on the outer periphery of the center conductor 2, and the insulator 3. Inner outer conductor 4a made of copper foil or the like covering the outer periphery, outer outer conductor 4b formed by braiding a copper wire arranged coaxially on the outer side of inner outer conductor 4a, and coaxially on the outer side of outer outer conductor 4b And an insulating coating 5 disposed on the surface.

  The coaxial connector (plug) used for the connection between the coaxial cable 1 and the device board is connected to the pin-type center contact 6 connected to the center conductor of the coaxial cable 1 and the outer conductor 4 of the coaxial cable 1. A cylindrical outer contact 7 and an insulating inner housing 8 interposed between the center contact 6 and the outer contact 7, and a barrel having a pair of mounting pieces 9, 9 on the outer contact 7. A structure is known which is integrally provided and can be attached to the coaxial cable 1 by gripping the outer periphery of the coaxial cable 1 (outer conductor 4) with both attachment pieces 9,9.

Further, as shown in FIG. 8, an inner sleeve 10 is arranged inside the folded outer conductor 4, an outer contact 11 and an outer sleeve 12 are arranged outside the outer conductor 4, and the outer sleeve 12 is caulked to caulk the outer conductor. Also known is a structure in which 4 and the external contact 11 are pressure-bonded (see, for example, Patent Document 1). In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned example, and description is abbreviate | omitted.
JP 2000-68009 A

  However, in the structure using the open barrel shown in FIG. 7 described above, there is a risk that the center contact may move because it is unstable only by fixing the barrel. Therefore, there is a problem in that the central contact becomes larger and the size of the entire connector is hindered. Further, because of such a structure, the shape of the inner housing becomes complicated, such as a divided structure, and there is a problem that the cost increases.

  On the other hand, the structure using the sleeve shown in FIG. 8 has a problem that the center contact may move when subjected to a thermal shock.

  In view of the above-described problems of the prior art, the present invention can reduce the size of the center contact, reduce the size of the entire connector, and can stably hold the center contact even when subjected to thermal shock. The purpose is to provide.

  In order to solve the above-described conventional problems and achieve the intended object, the invention according to claim 1 is provided with a center contact connected to the center conductor of the coaxial cable, and disposed outside the center contact. In the coaxial connector comprising an outer contact connected to an outer conductor of the coaxial cable, and an insulating inner housing that is interposed between the center contact and the outer contact and holds the center contact, the center contact is A pin-shaped contact portion, and a diameter-enlarging barrel portion continuous through the contact portion and a step portion, wherein the center contact opens to a rear end side of the inner housing, and a stepped contact is applied to the inner peripheral portion. This is a coaxial connector that is inserted into a contact insertion hole in which a stopper is formed, and is fixed to the inner housing in an arrangement in which the stepped portion is stopped against the stopper. The features.

  According to a second aspect of the invention, in addition to the configuration of the first aspect, the inner housing is held by the outer contact, and the coaxial cable is fixed to the outer contact.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the external contact includes a cylindrical inner shell into which the coaxial cable is inserted, and a cylindrical shape disposed on the outer peripheral side of the inner shell. The inner housing is held at the front end portion of the inner shell, and the rear end portion of the inner shell is fixed to the coaxial cable.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, an insulating outer housing that holds the outer contact is provided, and the outer shell projects outward from an outer surface thereof, and an inner surface of the outer housing And a retaining piece projecting from the outer peripheral portion of the inner shell is sandwiched between a rear end edge of the outer shell and the outer housing. It is characterized by that.

  According to the fifth aspect of the present invention, in addition to the structure of the first to third or fourth aspects, the center contact is formed by pressing a conductive plate material to form a pin-shaped contact portion and a base end side of the contact portion. It is characterized by being formed into a diameter-enlarging barrel portion continuous through the portion.

  A coaxial connector according to the present invention includes a central contact connected to a central conductor of a coaxial cable, an external contact disposed outside the central contact and connected to an external conductor of the coaxial cable, and the central contact and the external contact. A coaxial connector comprising: an insulating inner housing that holds the center contact; and an insulating outer housing that holds the outer contact, wherein the center contact includes a pin-shaped contact portion; A contact having a diameter-enlarging barrel portion continuous through the contact portion and a step portion, wherein the center contact is open to a rear end side of the inner housing, and a stepped stopper portion is formed on an inner peripheral portion; Inserted into the insertion hole, and fixed to the inner housing in an arrangement in which the stepped portion is held against the stopper. Ntakuto to be fixed to the internal housing without providing the lance and beats the like, can reduce the size of the central contact, and further it is possible to miniaturize the entire connector.

  The inner housing is held by the outer contact, and the coaxial cable is fixed to the outer contact, so that the center contact can be stably fixed to the inner housing without providing a lance or beat.

  The outer contact includes a cylindrical inner shell into which the coaxial cable is inserted and a cylindrical outer shell disposed on the outer peripheral side of the inner shell, and the inner housing is disposed at a front end portion of the inner shell. While being held, the rear end portion of the inner shell is fixed to the coaxial cable, so that the outer contact has a double structure with both inner and outer shells, so that the shielding property is high.

  An insulating outer housing for holding the outer contact is provided, and the outer shell is provided with a locking piece that projects outward from an outer surface of the outer shell and engages with a locking hole formed on the inner surface of the outer housing. The outer shell is securely attached to the outer housing by sandwiching a retaining piece protruding from the outer peripheral portion of the inner shell between the rear edge of the outer shell and the outer housing. The inner shell can be suitably fixed to the outer housing and can be easily assembled.

  The center contact is formed by pressing a conductive plate material into a pin-shaped contact portion and a diameter-enlarging barrel portion continuous through a stepped portion on the base end side of the contact portion, so that the unit cost is reduced. The cost can be reduced.

  Next, an embodiment of a coaxial connector according to the present invention will be described. The same parts as those in the above-described embodiment will be described with the same reference numerals.

  1 to 3 show an example of a coaxial connector, in which reference numeral 20 denotes a coaxial connector and reference numeral 1 denotes a coaxial cable.

  The coaxial cable 1 includes a central conductor 2 made of a conductor, an insulator 3 coaxially arranged outside the center conductor 2, and a copper covering the outer periphery of the insulator 3, as in the conventional example shown in FIG. 6. An inner outer conductor 4a made of foil or the like, an outer outer conductor 4b made of a braid of a copper wire coaxially arranged outside the inner outer conductor 4a, and an outer arranged coaxially outside the outer outer conductor 4b It is comprised with the insulation coating 5. FIG.

  The coaxial connector (plug) 20 is interposed between the central contact 21 to which the central conductor 2 of the coaxial cable 1 is connected, the external contact 22 arranged outside the central contact 21, and the central contact 21 and the external contact 22. An internal housing 23 and an external housing 24 for holding the external contact 22.

  The center contact 21 includes a pin-shaped contact portion 25 and a diameter-enlarged barrel portion 27 continuous through a stepped portion 26 on the rear end side of the contact portion 25, and is formed by press working.

  The contact portion 25 is formed in a cylindrical shape with a rounded tip, and is inserted into the center contact of the mating connector.

  The enlarged diameter barrel portion 27 is formed integrally with the contact portion 25 via a bent connection piece 28.

  The diameter-enlarging barrel portion 27 is integrally provided with a pair of gripping pieces 29 and 29 formed in mesh with each other, and the center conductor 2 is inserted between the gripping pieces 29 and 29 and crimped. The conductor 2 is held and electrically connected.

  Further, the diameter-enlarged barrel portion 27 is formed in a cylindrical shape having a diameter larger than that of the contact portion 25 and coaxially arranged with the contact portion 25 in the above-described caulked state. A step portion 26 is formed.

  The external contact 22 includes a cylindrical internal shell 30 and a rectangular cylindrical external shell 31 disposed outside the internal shell 30.

  The outer shell 31 is formed in a rectangular tube shape by a conductive material, and plate-shaped pressing pieces 32, 32 are formed integrally with the side plates of the rectangular tube at the rear end portions on both sides.

  Locking pieces 34, 34 such as a lance that engages with a locking hole 33 formed in the external housing 24 are formed on both upper and lower surfaces of the outer shell 31.

  On both side surfaces of the outer shell 31, elastic locking pieces 35, 35 that are locked to the external contacts of the mating connector are formed.

  The elastic locking piece 35 is formed with a locking projection 36 that engages with a locking hole formed in the external contact of the mating connector at the tip side.

  The inner shell 30 includes a small diameter portion 37 that holds the inner housing 23 at a front end portion thereof, that is, an end portion on the mating connector side, and a large diameter portion 38 that is continuously disposed on the rear end side of the small diameter portion 37. 1 is inserted.

  The small-diameter portion 37 is formed in a cylindrical shape, and a locking recess 39 continuous in the circumferential direction is formed on the outer peripheral surface of the front end portion, and the locking recess 39 fits with the external contact of the mating connector. Yes.

  The large diameter portion 38 is formed in a cylindrical shape whose inner diameter is substantially the same as the outer diameter of the coaxial cable 1, and a pair of retaining pieces 40, 40 are arranged symmetrically at the end opposite to the small diameter portion 37. Are integrally formed radially outward.

  In the inner shell 30, a connection sleeve 41 is disposed between the outer conductor 4 and the large diameter portion 38 of the coaxial cable 1, and a guide sleeve 42 is disposed between the inner outer conductor 4 a and the small diameter portion 37 of the coaxial cable 1. Is arranged.

  Then, by crimping the predetermined positions 30a, 30b, and 30c of the inner shell 30, the connection sleeve 41 and the large diameter portion 38, the guide sleeve 42 and the small diameter portion 37, and the insulating coating 5 and the large diameter portion 38 are crimped. The inner shell 30 and the coaxial cable 1 are connected.

  The connection sleeve 41 is formed in a cylindrical shape with a conductive material, and locking claws 43, 43... Are integrally formed at intervals in the circumferential direction.

  The locking claw 43 protrudes inward of the cylinder, elastically contacts the outer outer conductor 4 b of the coaxial cable 1, and fixes the connection sleeve 41 to the coaxial cable 1.

  The guide sleeve 42 is formed in a cylindrical shape having substantially the same diameter as the inner diameter of the inner shell 30 and has a cut 44 directed in the cylindrical axis direction.

  The guide sleeve 42 is disposed outside the inner outer conductor 4a made of copper foil or the like of the coaxial cable 1, and is reduced in diameter by being pressed from the outer side, and can be fixed to the outer portion of the inner outer conductor 4a. .

  The inner housing 23 is formed in a cylindrical shape with an insulating material such as a synthetic resin member, and has a front end portion outer periphery, that is, an outer periphery of the mating connector side portion, and a contact convex portion 45 continuous in the circumferential direction is formed on the rear end side. A concave groove 46 for caulking is formed, and the abutment convex portion 45 is inserted into the front end surface of the inner shell 30 by being inserted while expanding the fixing locking piece 47 projecting inwardly from the peripheral wall portion of the small diameter portion 37. The fixing locking piece 47 is fixed to the front end portion of the inner shell 30 by being locked to the side edge of the caulking concave groove 46.

  The inner housing 23 is formed with a recess 48 into which the inner housing of the mating connector is fitted at the front end, that is, an end on the mating connector side, and a contact insertion hole 49 communicating with the recess 48 is formed at the center. ing.

  The contact insertion hole 49 has a larger inner diameter on the rear end opening side, and a stopper 50 is formed on the inner periphery of the inner part. Therefore, the center contact 21 inserted into the contact insertion hole 49 is fixed to the inner housing 23 in an arrangement in which the tip end side of the contact portion 25 protrudes into the recess 48 and the step portion 26 is stopped against the stop portion 50. It is like that.

  A tapered chamfered portion 51 is formed at the rear end opening edge of the contact insertion hole 49 to facilitate insertion of the center contact 21.

  The outer housing 24 is formed of an insulating member made of a synthetic resin material in a box shape having a contact insertion portion 52 opened on the front surface, that is, the mating connector side.

  A cable insertion hole 54 through which the coaxial cable 1 is inserted is formed in the rear end side plate 53 of the outer housing 24, and a retaining piece 40 of the inner shell 30 is formed at the housing inner opening edge of the cable insertion hole 54. Retaining stopper contact recesses 55 and 55 into which 40 is fitted are formed.

  The outer housing 24 is formed with a holding portion 56 that holds the inner shell 30 at the approximate center of the outer housing 24.

  Further, a pair of elastic operation pieces 57, 57 for operating the elastic locking pieces 35 of the outer shell 31 are provided on both sides of the external housing 24, and the elastic locking pieces 57 are pushed inward by elastic locking. The piece 35 can be elastically deformed inward, whereby the state of engagement of the elastic locking piece 35 with the external contact of the mating connector is released.

  Furthermore, locking holes 33 and 33 are formed on the inner side surfaces of the upper and lower side plates 58 and 59 of the outer housing 24 to engage the locking pieces 34 and 34 of the outer shell 31.

  In the coaxial connector 20 configured in this manner, the center contact 21 connected to the center conductor 2 is inserted into the inner housing 23 held at the front end portion of the inner shell 30, and the inner shell 30 is inserted at that position. By caulking the small-diameter portion 37 and the guide sleeve 42, the large-diameter portion 38 and the connection sleeve 41, and the large-diameter portion 38 and the insulation coating 5, respectively, the coaxial cable 1 becomes immovable with respect to the inner shell 30 and becomes the center contact. 21 is also immovably held in the inner housing 23.

  Further, the retaining pieces 40, 40 of the inner shell 30 are brought into contact with the contact recesses 55, 55 and pressed by the pressing pieces 32, 32 of the outer shell 31 fixed to the outer housing 24, that is, the pressing pieces 32 and the outer housing. The coaxial cable 1 fixed to the inner shell 30 and the inner shell 30 is fixed to the outer housing 24 by sandwiching a retaining piece 40 between the inner shell 30 and the outer housing 24.

  Next, a method for assembling the coaxial connector 20 will be described.

  First, the coaxial cable 1 is passed through the cable insertion hole 54 of the outer housing 24, the outer housing 24 is moved to the cable base end side, the tip end portion of the coaxial cable 1 is stripped, and the center conductor 2 and the outer conductor 4 are exposed.

  Next, the center conductor 2 is inserted into the enlarged diameter barrel portion 27 and the gripping pieces 29 and 29 are caulked to connect the center contact 21 to the center conductor 2.

  Then, the connection sleeve 41 is fitted into the outer conductor 4 of the coaxial cable 1, that is, the outer side of the outer outer conductor 4 b, and the locking pieces 43 and 43 are brought into elastic contact with the outer side of the outer outer conductor 4 b of the coaxial cable 1. And the outer outer conductor 4b on the distal end side is folded back and placed on the outer side of the connection sleeve 41 to expose the inner outer conductor 4a.

  Next, the guide sleeve 42 is fitted on the outer side of the inner outer conductor 4a on the distal end side with respect to the connection sleeve 41, pressed from the outer side to reduce the diameter, and temporarily fixed.

  The coaxial cable 1 thus configured is inserted into the inner shell 30 holding the inner housing 23 at the front end in advance.

  At this time, the center contact 21 is guided by the chamfered portion 51 and inserted into the contact insertion hole 49, and the guide sleeve 42 is inserted into the small diameter portion 37, thereby being guided on the center line, and the stepped portion 26 is applied. It is inserted to a position where it is stopped by the stopper 50.

  In this state, the predetermined position of the inner shell 30 is crimped, and the small-diameter portion 37 and the guide sleeve 42, the large-diameter portion 38 and the connection sleeve 41, and the large-diameter portion 38 and the insulating coating 5 are respectively crimped.

  Thereby, the center contact 21 is held in the inner housing 23 so as not to move.

  Then, the outer housing 24 is moved forward to accommodate the inner shell 30 in the outer housing 24.

  Next, the outer shell 31 is inserted into the outer housing 24 until the locking pieces 34, 34 are engaged with the locking holes 33. By doing so, the outer shell 31 is attached to the outer housing 24, and the end portion of the pressing piece 32 holds the retaining pieces 40, 40 between the rear end edge of the outer shell 31 and the outer housing 24. A retaining piece 40 is clamped to fix the inner shell 30 to the outer housing 24 so as not to move.

  Thus, the connector is assembled.

  In the above-described embodiment, an example in which the outer shell 31 is formed in a rectangular tube shape has been described. However, a cylindrical shape or other cylindrical shapes may be used.

  In the above-described embodiment, the example in which the external contact is configured by the internal shell and the external shell has been described. However, the external contact may be integrally formed in a cylindrical shape.

  Furthermore, in the above-described embodiment, the connection sleeve and the guide sleeve are arranged between the outer conductor of the coaxial cable and the outer contact (inner shell), both the sleeves are connected to the outer conductor, and the outer contacts are connected to both the sleeves. The example in which the external contact is fixed to the coaxial cable by crimping has been described. However, the external contact may be fixed by other methods such as providing a gripping claw on the external contact and gripping the cable with the gripping claw.

It is a longitudinal section showing a coaxial connector concerning the present invention. It is a cross-sectional view same as the above. It is an exploded perspective view same as the above. (A) is a top view which shows the state before attachment of the center contact in FIG. 1, (b) is the same side view. It is sectional drawing which shows the aspect of the inner shell in FIG. It is a perspective view which shows an example of a coaxial cable. It is sectional drawing which shows an example of the conventional coaxial connector. It is sectional drawing which shows another example of a coaxial connector same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coaxial cable 2 Center conductor 3 Insulator 4a Inner outer conductor 4b Outer outer conductor 5 Insulation coating 20 Coaxial connector (plug)
21 Central contact 22 External contact 23 Internal housing 24 External housing 25 Contact part 26 Step part 27 Expanded barrel part 28 Connection piece 29 Holding piece 30 Internal shell 31 External shell 32 Holding piece 33 Locking hole 34 Locking piece (Lance)
35 elastic locking piece 36 locking convex part 37 small diameter part 38 large diameter part 39 locking concave part 40 retaining part 41 connection sleeve 42 guide sleeve 43 locking claw 44 cut 45 contact convex part 46 caulking concave groove 47 Locking piece for fixing 48 Recess 49 Contact insertion hole 50 Stopping portion 51 Chamfered portion 52 Contact insertion portion 53 Rear end side plate 54 Cable insertion hole 55 Retaining piece abutting recess 56 Holding portion 57 Elastic operation piece 58 Upper plate 59 Lower plate

Claims (5)

A central contact connected to a central conductor of the coaxial cable, an external contact disposed outside the central contact and connected to an external conductor of the coaxial cable, and interposed between the central contact and the external contact, In a coaxial connector comprising an insulative inner housing that holds a center contact,
The center contact includes a pin-shaped contact portion, and an enlarged barrel portion continuous with the contact portion via a stepped portion,
The center contact is opened in a rear end side of the inner housing, and is inserted into a contact insertion hole in which a stepped stopper portion is formed on an inner peripheral portion, and the step portion is stopped against the stopper portion. A coaxial connector characterized in that the arrangement is fixed to the inner housing.   The coaxial connector according to claim 1, wherein the inner housing is held by the outer contact, and the coaxial cable is fixed to the outer contact.   The outer contact includes a cylindrical inner shell into which the coaxial cable is inserted and a cylindrical outer shell disposed on the outer peripheral side of the inner shell, and the inner housing is disposed at a front end portion of the inner shell. The coaxial connector according to claim 1, wherein the coaxial connector is held and a rear end portion of the inner shell is fixed to the coaxial cable.   An insulating outer housing for holding the outer contact is provided, and the outer shell is provided with a locking piece that projects outward from an outer surface of the outer shell and engages with a locking hole formed on the inner surface of the outer housing. The coaxial connector according to claim 3, wherein a retaining piece protruding from an outer peripheral portion of the inner shell is sandwiched between a rear end edge of the outer shell and the outer housing.   The center contact is formed by pressing a conductive plate material into a pin-shaped contact portion and a diameter-enlarging barrel portion continuous via a stepped portion on the proximal end side of the contact portion. 4. The coaxial connector according to 4.

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