JP2661794B2 - Coaxial connector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coaxial connector for terminating a coaxial cable and a termination method.

BACKGROUND OF THE INVENTION Small coaxial connectors are often made up of machined internal and external contacts. Machining them is expensive because the contacts are of a relatively complex shape. Sheet metal parts are not commonly used because it is difficult to attach the sheet metal to the cable to withstand a moderate force to pull the cable away from the connector. U.S. Pat. No. 4,891,022 shows a crimped ferrule around a sheet metal piece. Connectors that are constructed at low cost and that are securely held in simultaneous cables are valuable.

[Problems to be Solved by the Invention] An object of the present invention is to provide a coaxial connector and a termination method for coaxial cable termination which are securely fixed to a cable at low cost.

Means for Solving the Problems The present invention relates to a cable inner conductor, a cable inner insulator surrounding the inner conductor, and a braided cable outer conductor surrounding the inner insulator. A coaxial connector terminating for a coaxial cable surrounding the outer conductor of the braid and including an outer insulator having a forward end, comprising an inner ferrule and an outer ferrule, wherein the inner ferrule is an outer insulator of the cable. The outer insulation of the cable is cut in front of the inner ferrule, fitted around the perimeter, and the outer conductor of the cable in the form of a braid is folded back over the perimeter of the inner ferrule to form the outer contact of the coaxial connector. Comprises a rear portion located around the exposed braid of the outer conductor which is folded back over the inner ferrule. The outer ferrule is disposed so as to fit around the rear part of the braided outer conductor and the outer contact superposed on the outer periphery of the inner ferrule, and the front end of the inner ferrule is substantially at the same position as the front end of the outer insulator. And prior to mating of the outer ferrule, the inner ferrule is crimped to the outer insulator of the cable by a first compression from its periphery and mechanically coupled to the cable, the outer ferrule covering the rear portion of the outer contact. After being fitted and fitted, the second compression different from the first compression is crimped to the rear portion of the outer contact, the outer conductor of the braid, and the inner ferrule to be joined to each other.

In one embodiment, the connector includes internal and external contacts and an insulator therebetween. The external contacts are formed of substantially cylindrically wound sheet metal.
The inner ferrule is first fitted to the cable and mechanically secured to the cable by crimping the ferrule around the outer insulation (ie, jacket) of the cable. The outer conductor of the cable is positioned over the perimeter surface of the crimped inner ferrule, the rear part of the outer contact made of sheet metal is positioned around the outer conductor of the cable, and the outer ferrule is the outer contact made of sheet metal It is crimped around. Because the inner ferrule is crimped to the outer insulator of the cable, a high retention force is provided that withstands the force separating the cable from the connector between the outer contact and the outer insulator of the cable. The ferrule can be constructed at low cost from ordinary seamless tubing. This makes it possible to construct the connector contacts at low cost, in particular sheet metal wound external contacts.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective sectional view of a coaxial connector and a cable device configured according to the present invention.

FIG. 2 shows the center line or axial part shown in cross section and the part below it shown in the front.
It is a side view of the apparatus of FIG.

 FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is a side sectional view of an external contact of the connector of FIG.

 FIG. 5 is a side sectional view of the insulator of the connector of FIG.

FIG. 6 is a partial side sectional view of the internal contact of the connector of FIG.

 FIG. 7 is a sectional view taken along line 7-7 in FIG.

 FIG. 8 is a sectional view taken along line 8-8 in FIG.

1 and 2 show a coaxial connector 12 and a coaxial cable.
14 shows an assembly 10. The cable includes an inner conductor 16, an inner insulator 20 typically surrounding the inner conductor, an outer conductor 22 surrounding the inner insulator 20, and an outer insulator or outer insulator 24 typically surrounding the outer conductor 22. The forward end portion 26 (with respect to forward direction F) of the cable is a distance from the forward end of the cable, with the forward portion of the inner insulator 20 and outer conductor 22 removed,
Further, a part of the outer insulator 24 is removed rearward (in the rear direction R).

The connector 12 has internal and external contacts 30, 32,
And a molded dielectric insulator 34 therebetween.
The internal contact 30 has a front portion 36 with a slot 38 to form a socket and receive a pin contact.
The inner contact has an intermediate portion 40 with teeth 42 extending with the outer rear piece to mate with a shoulder 44 on the insulator to hold the inner contact against rearward movement. The rear portion 46 of the inner contact is designed to be crimped around and connected to the inner conductor 16 of the cable. The external contacts 32 include a front portion 50 that impedes forward movement of the insulator, and an intermediate portion 52 having protrusions 56 that hold the external contacts in teeth 54 and a retaining wall that may be part of a connector housing, circuit board, etc. Having. The outer contacts have a rear portion 60 that is electrically connected to the outer conductor 22 of the cable and mechanically holds the cable to prevent the cable from being pulled rearward from the connector.

Inner and outer ferrules 70, 72 are used to securely hold the rear portion 60 of the outer contacts in good electrical connection with the cable outer conductor 22 and good mechanical connection with the cable outer insulator 24. Internal ferrule
70 is crimped around the cable outer insulator 24. The outer conductor 22 of the cable is in the form of a braid and is wrapped rearwardly to include a portion 74 located around the crimped inner ferrule 70. The outer ferrule 72 is crimped around the rear portion 60 of the outer contact so as to electrically and mechanically connect the outer contact to the cable outer conductor portion 74 and to the cable outer insulator 24 through the inner ferrule. Deform radially inward with respect to the axis of coupling 76.

In order to construct the coaxial connector 12 at low cost, the internal contacts 30 and the external contacts 32 are formed of sheet metal, and each contact is formed by stamping and deforming a piece from the sheet metal. The resulting pieces each have seams 80, 82 (see FIGS. 4 and 6) where the edges of the sheet metal pieces are brought together but not joined, so that the seam is welded to the sheet edges at the seam. In their original state, not connected or joined together. Although sheet metal pieces can be constructed at low cost, they cannot perform all the functions of similar parts composed of solid metal blocks machined to the desired shape. In particular, the rear part of the external contact cannot be reliably crimped around the cable. However, ferrules 70, 72
A low-cost crimping process can be easily performed because of the use of the joint.

The ferrules 70, 72 are formed of a continuous or seamless tube section. Because it is a simple tube,
Although it is available at low cost, their construction makes it impossible to reliably crimp them to the device. By crimping the inner ferrule 70 directly surrounding the cable outer insulator 24, the cable outer insulator is the strongest part of the cable under tension loading and therefore the best part for mounting the cable so that it cannot be pulled away from the connector. Provides a secure mechanical connection to the The use of an external ferrule 72 that can be securely crimped provides a mechanical and electrical connection to the cable outer conductor 22 and to an inner ferrule 70 that is securely held through the cable outer insulator. Thereby, the rear part of the external contact can be securely held.
As a result, a good electrical connection and a good mechanical connection to the strongest part of the cable can be obtained, and high reliability can be given. This is achieved using crimped sheet metal external contacts that can be constructed at low cost, and a pair of ferrules that are continuous and low cost manufactured from low cost tubing. .

First, the insulator 34 is inserted into the outer contacts 32 until the inwardly bent teeth 90 on the outer contacts fit behind the shoulders 92 on the insulator. To connect the cable to the connector, the cable is first cut as shown and pressed onto the cable to crimp the inner and outer ferrules thereon. The exposed end of the inner conductor 16 is located in a pocket in the rear portion 46 of the inner contact, and the inner contact is crimped around it.

The inner ferrule 70 is located just behind the front end of the outer insulator as shown in FIG. 2 and is crimped to that position. The woven outer conductor 22 is wound back around the inner ferrule. A cable attached to it and having internal contacts is inserted into the rest of the connector. Finally, the outer ferrule 72 is moved forward until it is positioned around the rear portion of the outer contact, and the outer ferrule is crimped in that position. The combination of the connector and the cable attached thereto can be inserted into the retaining wall 58 (FIG. 2) until the projection 56 on the external contact mates with the rear face of the retaining wall. Just before that, the teeth 54 on the external contacts
Is fitted behind the retaining shoulder 96 on the retaining wall.

The external contact 32 has a length of 0.830 inches (21.8 m
m), the illustrated structure is 0.186 inches (4.71 mm) in rear diameter and 0.120 inch (0.31 mm) thick, made of phosphor bronze 521, plated with nickel, gold and tin-lead alloys Of contacts were manufactured. The inner contact 30 is comprised of a 0.008 inch (0.21 mm) thick sheet of the same material and has an outer diameter along the front portion of 0.062 inch (1.58 mm). The insulator is molded from a thermoplastic and the cavities 102, 104 are easily formed by molding. Other dimensions are shown by actual measurements in the figure.

Thus, the present invention provides a coaxial connector that is configured at low cost and that is easily electrically and mechanically connected to a coaxial cable. At least the external contacts of the connector are formed from sheet metal. The rear part of the external contact is located around the rear part of the external contact and is retained on the cable external connector by crimp bonding by using an external ferrule that is crimped to press the external contact tightly onto the external connector of the cable Can be. Good mechanical connection of the cable to the external outer insulator is achieved by first crimping the inner ferrule to the outer insulator. With the outer connector of the braid, i.e., the cable folded around the crimped inner ferrule, the subsequent step of crimping the outer ferrule to hold the outer contact in the braid causes the outer contact to pass through the crimped inner ferrule. It is mechanically held by the cable outer insulation. Seal Rem ferrules are available at low cost and allow the use of low cost sheet metal external contacts.

While particular embodiments of the present invention have been described and described, it will be appreciated that modifications and variations can be readily made by those skilled in the art, and the claims cover such modifications and their equivalents. Is intended.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Hei 1-177883 (JP, U) Special Table Hei 1-501825 (JP, A) US Patent 4,891,022 (US, A) European Publication 346027 (EP, A2)

Claims (3)

(57) [Claims] A cable inner conductor (16) and a cable inner insulator (20) surrounding the inner conductor (16).
Coaxial cable comprising: a cable outer conductor (22) in the form of a braid surrounding the inner insulator; and an outer insulator (24) surrounding the outer conductor (22) of the braid and having a front end. A coaxial connector terminating with respect to an inner ferrule (70) and an outer ferrule (72), wherein the inner ferrule (70) is fitted around an outer insulator of the cable; An outer insulator (24) of the cable is cut in front of the inner ferrule (70), and a cable outer conductor (22) in the form of the braid is folded back around the inner ferrule to form a coaxial connector. The outer contact (32) comprises a rear portion (60) positioned around the exposed braid of the outer conductor (22) which is folded back over the inner ferrule. Fe Lumpur (72), said inner ferrule (7
0) is fitted around the outer conductor (22) of the braid and the rear portion (60) of the external contact (32) superposed on the outer periphery of the inner ferrule (70). The upper ferrule (70) is located at the same position as the front end of the outer insulator (24), and before the outer ferrule (72) is fitted, the inner ferrule (70) is subjected to a first compression from the periphery thereof so that the outer insulator (24) ) And mechanically coupled to the cable, the outer ferrule (72) being fitted over the rear portion (60) of the outer contact, and then having a second compression different from the first compression. The rear part of the external contact (6
0) and the outer conductor (22) and the inner ferrule (7
0) and are joined together by crimping. 2. A cable inner conductor (16), a cable inner insulator (20) surrounding the inner conductor (16), a cable outer conductor (22) surrounding the inner insulator, and a cable outer conductor (22) surrounding the inner insulator. A coaxial cable (1) comprising inner and outer contacts (30, 32) and an insulator (34) therebetween, comprising a coaxial cable comprising an outer insulator (24) surrounding the conductor (22).
In the method of terminating at 2), the inner conductor (16) is connected to the inner contact (30), and the inner ferrule (7) is wrapped around the cable outer insulator (24).
0) is fitted and arranged, and the periphery of the inner ferrule is covered with a part of the outer conductor, and the inner ferrule and a part of the cable outer conductor located therearound are coaxial connector (12). Rear part of the external contacts (6
0), an outer ferrule (72) is fitted around a part of the rear part of the outer contact located around the inner ferrule, and the outer ferrule (72) is compressed from the periphery and crimped, In the step of fitting and arranging the inner ferrule, the inner ferrule (70) is attached to the cable outer insulator (24).
The inner ferrule (70) is crimped to the outer insulator (24) of the cable by compressing from the surroundings in a state where the cable is fitted, and in the step of crimping the outer ferrule, the inner ferrule (70) is crimped to the outer insulator (24) of the cable. A part of the cable outer conductor and the rear part (60) of the external contact are superimposed on the inner ferrule (70), and the outer ferrule (72) is fitted thereon, and then compressed from the periphery to compress the rear part of the external contact ( 60) and a method of terminating a coaxial cable, wherein the outer conductor (22) and the inner ferrule (70) of the braid are crimped and firmly joined. 3. A front end portion of the inner ferrule (70) is located at substantially the same position as a front end portion of the outer insulator (24) in the step of crimping the inner ferrule (70);
The termination method according to claim 2, comprising crimping the inner ferrule (70) around the outer cable insulator (24).