JPH026627Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a small diameter coaxial connector.

[Conventional technology]

As shown in FIG. 6, this type of small-diameter coaxial connector includes a center contact 3 connected to the exposed portion of the core wire 2 of the coaxial cable 1, an inner coating layer 4 of the coaxial cable 1, and a center contact 3 connected to the exposed portion of the core wire 2 of the coaxial cable 1.
an insulating holder 6 that covers the coaxial cable 1 from the outside, a cylindrical ferrule 8 that fits on the outside of the outer coating layer 7 of the coaxial cable 1 and faces the holder 6 in the axial direction, and a shield wire of the coaxial cable 1. Of these, one is known that includes a cylindrical external conductor 11 tightly fitted to the outside of the folded portion of the ferrule 8 and the outside of the holder 6 (for example, Utility Model Application No. 62-66187). (see official bulletin).

In the coaxial connector, the core wire 2 of the coaxial cable 1 and the center contact 3 are connected by soldering. The holder 6 is made into a cylindrical shape by abutting two semi-cylindrical parts against each other after the above-mentioned soldering. As shown in FIG. 7, the ferrule 8 has a window 13 that fits into the protrusion 12 of the holder 6, and a claw 16 that engages with the tube 14. Note that this coaxial connector has an insertion hole 18 at one end into which a pin terminal 17 is inserted.

[Problem that the invention attempts to solve]

According to the above-mentioned coaxial connector, since the core wire 2 and the center contact 3 are connected by soldering, the holder 6 must be made from a combination of two parts. This is because the cylindrical holder cannot be forcefully fitted in the axial direction since the soldered portion is susceptible to connection failure due to external force. Therefore, the assembly work becomes complicated and troublesome.

Furthermore, semi-cylindrical parts are susceptible to deformation during handling, so there is a problem that there is a high risk of producing defective products.

Furthermore, if the core wire 2 and the center contact 3 are connected by soldering, advanced technology is required for the process itself and for maintaining quality.

Therefore, the problem of this invention is that the assembly work is easy;
Another object of the present invention is to provide a small-diameter coaxial connector that is less likely to produce defective products and that can easily maintain high quality.

[Means for solving problems]

According to the present invention, a center contact connected to an exposed portion of a core wire of a coaxial cable, an insulating holder that covers an inner coating layer of the coaxial cable and the center contact from the outside, and a a cylindrical ferrule that fits on the outside of the outer coating layer and faces the holder in the axial direction;
In a small-diameter coaxial connector comprising an outer conductor that is in close contact with the outside of a portion of the shielded wire of the coaxial cable that is folded back to the outside of the ferrule and the outside of the holder, the holder is integrated with the inner surface of the outer conductor. The center contact is made of molded resin, and the center contact has a connecting portion that is caulked to the exposed portion of the core wire, and the holder includes an engaging protrusion that protrudes from the inner surface and engages the center contact in the axial direction. A small-diameter coaxial connector is obtained, characterized in that it has a pressing protrusion that also protrudes from the inner surface and is pressed against the inner coating layer.

〔Example〕

1 and 2 show a small diameter coaxial connector according to an embodiment of the present invention. In this embodiment, the same parts as in FIGS. 6 and 7 are given the same reference numerals, and their explanation will be omitted.

Referring to FIG. 1, the center contact 3 includes a contact portion 21 that contacts a pin terminal (not shown) inserted into the insertion hole 18, and a connecting portion 22 that is caulked to the core wire 2 of the coaxial cable 1. have. The holding body 6 is made of an insulating material such as plastic, and has a cylindrical portion 19. Cylindrical part 1
First, second, and third protrusions 23, 24, and 25 are formed on the inner surface of 9 at different positions in the longitudinal direction. The holder 6 is adhered to the inner surface of the outer conductor 11 and is integrated with the outer conductor 11.
Note that the outer conductor 11 is formed with an open barrel type barrel portion 30 to which the coaxial cable 1 is caulked.

Next, with reference to FIG. 3 in addition to FIGS. 1 and 2, this small-diameter coaxial connector will be described along with a manufacturing method.

First, as shown in FIG. 3a, the coaxial cable 1 is processed to expose the core wire 2 and the shield wire 9. Next, in FIG. 3b, the center contact 3 and ferrule 8 are attached to the coaxial cable 1. The center contact 3 and ferrule 8 are as shown in FIG.
It can be made from a single piece of metal plate. here 31
and 32 are carriers for the center contact 3 and ferrule 8. The center contact 3 is attached by caulking the connecting portion 22 to the core wire 2. On the other hand, the ferrule 8 is the outer coating layer 7
It is attached so as to surround it from the outside. Note that after installation, the carriers 31 and 32 are removed.

After the attachment of the center contact 3 and ferrule 8 to the coaxial cable 1 is completed, the shield wire 9 is folded back and placed along the outside of the ferrule 8 as shown in FIG. 3c. At this time, the outside of the ferrule 8 is covered with a substantially uniform density by the shield wire 9.

In this state, the outer peripheral surface from the end of the ferrule 8 to the coaxial cable 1 is covered with the tube 14 to obtain the state shown in FIG. 3d. Since the connecting portion between the core wire 2 and the center contact 3 is obtained by caulking, the connecting portion will not be destroyed even if a slight external force is applied when the holder 6 is fitted.

Furthermore, as shown in FIG. 3e, the outside of the center contact 3, shield wire 9, and tube 14 are covered with an external conductor 11 in a fitted state.

A holder 6 is integrally formed on the inner surface of the outer conductor 11 by molding, as shown in the unfolded state in FIG. Molding is performed by feeding the outer conductor 11 with the carriers 31 and 32 attached to the molding machine. At this time, the holder 6 is formed with a projection 23 for pressing the center contact 3 and projections 24 and 25 for pressing the inner coating layer 4 of the coaxial cable 1. First protrusion 23
is for locking the center contact 3 in the axial and rotational directions, and is herein referred to as an engaging protrusion. Further, the second and third protrusions 24 and 25 are strongly pressed against the outer circumferential surface of the inner coating layer 4, thereby preventing relative movement between the inner coating layer 4 and the outer conductor 11, Here, it is called a pressing protrusion. The inward flange portion 34 forming the insertion hole 18 shown in FIG. 1 is provided with a number of wedge-shaped notches 36, as shown in FIG. 5, so as to ultimately form a cylindrical shape.

On the other hand, the barrel portion 30 of the outer conductor 11 is formed with a claw portion 33 for firmly and closely holding the tube 14 and the shield wire 9 from the outside.
Note that 35 is a groove portion for allowing the claw portion 33 to escape.

As shown in FIG. 5, the integrated holding body 6 and external conductor 11 are wound around the center contact 3, ferrule 8, and tube 14, and the carriers 31 and 32 are separated. Then, while engaging the claw portion 33 of the barrel portion 30 with the groove 35, the barrel portion 30 corresponding to the shield wire 9 of the external conductor 11 is caulked from the outside.

As a result, the shield wire 9 is tightly sandwiched between the ferrule 8 and the outer conductor 11. Therefore, by caulking the barrel portion 30, everything from the center contact 3 to the ferrule 8 is embraced, and the assembly of the small diameter coaxial connector shown in FIGS. 1 and 3e is completed. Note that the outer conductor 11 and the holder 6 that are integrally molded have a cut extending between both ends in the axial direction at one location in the circumferential direction.

According to the above-mentioned small-diameter coaxial connector, since the connection between the center contact 3 and the core wire 2 is made by caulking, there is no fear of breaking the connection.
The holding body 6 can be integrally formed in advance. Therefore, the occurrence of deformation of the holder 6 can be suppressed to a low rate, and moreover, the holder 6 can be easily assembled. Also, due to the effects of the first, second, and third projections 23, 24, and 25 provided on the holder 6,
Coaxial cable 1, center contact 3, holder 6,
and relative movement of the outer conductor 11 is prevented.
Moreover, since the outer conductor 11 is caulked together with the shield wire 9 and the ferrule 8, there will be no loosening between the parts.

[Effect of idea]

As explained above, according to the present invention, it is possible to obtain a small diameter coaxial connector that is easy to assemble, is less likely to produce defective products, and is easy to maintain high quality.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a small diameter coaxial connector according to an embodiment of the present invention, Fig. 2 is a half-sectional side view of a holder used in the connector of Fig. 1, and Figs. 4 is an exploded view of a component integrally formed with the center contact and ferrule used in the connector of FIG. 1, FIG. 5 is an expanded view of the outer conductor and holder, FIG. 6 is a longitudinal sectional view of a conventional small-diameter coaxial connector, and FIG. 7 is a perspective view of a ferrule used in the connector of FIG. DESCRIPTION OF SYMBOLS 1... Coaxial cable, 2... Core wire, 3... Center contact, 4... Inner coating layer, 6... Holder,
7... External coating layer, 8... Ferrule, 9... Shield wire, 11... Outer conductor, 21... Contact part,
22... Connection portion, 23... First protrusion (engaging protrusion), 24... Second protrusion (pressing protrusion), 3
0... Barrel part.

Claims (1)

[Claims for Utility Model Registration] 1. A center contact connected to an exposed portion of the core wire of a coaxial cable, an insulating holder that covers the inner coating layer of the coaxial cable and the center contact from the outside, and the above. A cylindrical ferrule that fits on the outside of the outer sheathing layer of the coaxial cable and faces the holder in the axial direction; In a small diameter coaxial connector including an outer conductor that is in close contact with the outside of a holder, the holder is made of resin integrally molded on the inner surface of the outer conductor, and the center contact is caulked to the exposed portion of the core wire. The holding body has a connecting part, and the holding body has a
A small diameter coaxial connector characterized by having an engaging protrusion protruding from the inner surface and axially engaged with the center contact, and a pressing protrusion also protruding from the inner surface and pressed against the inner coating layer. 2. The small diameter coaxial connector according to claim 1, wherein the external conductor and the holding body are integrally molded and have a cut extending between both ends in the axial direction at one point in the circumferential direction. .