DE2840513A1 - COAXIAL CONNECTOR - Google Patents

Description

PATENT LAWYERS

A. GRÜNECKER

D) PU-INa

H. KINKELDEY

DR-ING.

W. STOCKMAIR

DR-INa-AeE (CALTEOi

K. SCHUMANN

DR B £ R NAT.-DPL-PHYS.

P. H. JAKOB

aPL-ING.

G. BEZOLD

DR RERNOT- DJFL-CHen

8 MUNICH

MAXIMILIANSTRASSE

P 15 120

Coaxial connector
The invention relates to a coaxial connector.

In the case of an axial connector, it is important that the Inner conductor held immovably in the axial and radial directions in an insulator separating it from the outer conductor is. This is particularly important with a double-sided connector, in which a cylindrical

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TELEPHONE (OSS) SS 28 62

TELEX OB-29 38O

TELEQRAMS MONTH - TELECOPER

Outer conductor and an inner conductor having plug or socket contacts at both ends and arranged coaxially are separated from each other by an insulator.

In known double-sided coaxial connectors, the inner conductor usually has a through on its central part two ring steps arranged at a certain distance from one another limited constriction. The outer conductor and the The insulator are penetrated by holes that are aligned with one another and run to the middle part of the inner conductor. An epoxy resin is poured into the aligned holes and made to solidify, so that a cylindrical fastening part is created, the inner part of which is held between the ring steps of the inner conductor The outer end surface of the cylindrical fastener is designed so that it is flush with the outer surface of the Outer conductor runs. The fastening part is then held in place by the outer conductor and prevents movements of the inner conductor relative to the outer conductor.

However, this arrangement has certain shortcomings. The poured resin can shrink when solidifying, so that then cavities arise between the inner part of the fastening part and the ring steps of the inner conductor. One secure material connection between the cylindrical fastening part made of epoxy resin and the inner conductor is therefore difficult to achieve. In particular after prolonged use, the inner conductor can then be removed without difficulty twist, but the fastening part usually has a sufficient grip against axial movements of the Inner conductor offers relative to the outer conductor. The processing of the inner conductor to produce the for its axial Attachment within the outer conductor necessary constriction is also very cumbersome and expensive, since the inner conductor usually has a very small diameter anyway.

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It is therefore an object of the invention to provide a coaxial connector with an improved attachment of the Inner conductor within the outer conductor, which offers greater security against twisting of the inner conductor than known designs.

Another object of the invention is to provide a mounting arrangement for preventing relative Axial movements between the inner and outer conductors.

Koch An object of the invention is to provide a coaxial connector of the type mentioned above, which has a predetermined characteristic in all its areas Has line resistance.

The following are embodiments of the invention. explained with reference to the drawing. Show it:

Fig. 1 is an axial sectional view of a known coaxial connector,

2A is an axial sectional view of a coaxial connector in an embodiment of the invention;

Fig. 2B is a sectional view taken along line 2B-2B in Fig. 2A;

3 shows a sectional view corresponding to FIG. 2B Coaxial connector with modified devices to compensate for the characteristic line resistance and

Fig. 4 is an axial sectional view of a coaxial connector in another embodiment of the invention.

A known coaxial connector shown in Fig. 1 has an inner conductor 1, an outer conductor 4 and a tubular

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-K-

■ Τ-

shaped insulator 5 "The middle part of the inner conductor has a constriction 2 in the form of a groove 3" delimited ^{by two opposing steps 3a, 3a 1} is preferably greater than the distance between the two steps 3a, 3a ¹ .

When assembling the connector according to Pig. Λ the inner conductor 1 is inserted into the insulator 5 and this is then inserted into a central position in the outer conductor 4-. An epoxy resin is then poured into the bores 6a, 6b and allowed to harden. The solidified resin then forms a cylindrical fastening part 7 with a projection 7a at the inner end which ^{sits between the steps 3a and 3a 1} , so that the inner conductor cannot be moved in the axial direction relative to the outer conductor.

However, this type of assembly of the connector has certain shortcomings. The cast epoxy resin can be used during Hardening and shrinking, so that between the fastening part 7 and the metal parts, in particular the groove 3 » Cavities arise. However, this is a secure material connection between the fastening part 7 and the inner conductor 1 in question, so that this can be twisted, although it is due to the engagement of the Fastening part 7 with the recess 3 in the axial direction is held immovably. In addition, the machining of the already small diameter having inner conductor for producing the insertion groove 3 is quite difficult and expensive.

2A and 2B show an embodiment of the invention. For secure attachment of the inner conductor in the insulator 5, the inner conductor 1 has here instead of one Constriction a roughened peripheral surface 8.

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·? ■

In order to make the comparison between FIG. 1 and FIG. 2A, 2B facilitate, the same reference numerals are used in the figures for corresponding parts. In the embodiment according to FIGS. 2A and 2B, the inner conductor 1 has a socket contact 1a, 1a 'at both ends. On the middle part of the inner conductor 1 has a roughened circumferential surface 8, which by machining with a Manufactured knurled wheel and a number of mutually circumferential spacings in the axial direction May have ribs.

The outer conductor 4- has an external thread 4-a at each end for a union nut of a complementary connector. The outer conductor has on the middle part of its inner surface 4- also a roughened surface 9, which is about a Number of adjacent, annular ribs or grooves may have. For example, one made of heat-resistant Polytetrafluoroethylene molded insulator 5 is penetrated by a radial bore 10 in the area of the roughened surface 8 of the inner conductor. This one has one larger diameter than the middle part of the inner conductor and is filled with an adhesive 11. In which Adhesive 11 is a liquid at room temperature resin, such as an epoxy resin, which by heating is solidifiable.

As can be seen in FIG. 2B, the insulator 5 can be in the area of the radial bore 10 have cutouts 12 on its outside, which are used for a through the epoxy resin Unevenness of the line resistance caused in the hole equalize so that the connector over its entire length a uniform, constant Line resistance to v / ei st.

When assembling the connector, the inner conductor 1 is pressed into an axial central bore 5 'cLes insulator 5, to the center of the roughened surface 8 in the

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The center of the bore 10 is seated, whereupon it is then filled with the adhesive 11, including the insulator 5 with the inner conductor 1 sitting therein so inserted into the outer conductor 4- that the radial bore 10 of the roughened inner surface 9 is opposite, whereupon the adhesive 11 is then solidified by heating.

Do the assembly of the connector in the above described manner, the roughened surfaces 8, 9 are on the outside of the inner conductor 1 or the inside of the outer conductor 4- securely to each other by the solidified adhesive tied together. When pouring into the radial bore, the adhesive fills its entire volume, including of the depressions and unevenness of the roughened surfaces 8, 9 completely. Even if the glue then shrinks during solidification, the result is a much better hold than with the smooth surfaces known connector of the type shown in Fig. 1. In the embodiment of Fig. 2, the inner conductor is therefore non-rotatable and held immovably in the axial direction relative to the outer conductor. In trials tensile and torsional forces in the order of magnitude of 5 to 6 kp were exerted on the inner conductor T without this was twisted or moved in the axial direction. The connector according to the invention thus meets the requirements of the tight fit of the inner conductor.

In the known connector shown in Fig. 1, the characteristic textural resistance is the inner conductor larger in the area of the constriction 2 than in the other areas of the connector, so that an undesired Unevenness of the line resistance results. In order to obtain the most uniform possible texturing resistance, the bores 6, 6a must therefore be filled with a resin which has a higher dielectric constant has as the insulator 5 In & er practice, however, it is difficult to to find a resin that has such a dielectric

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constant has that a reasonably uniform Line resistance is achievable. In order to achieve a uniform line resistance, the manufacturer must therefore 'The dimensions of the constriction 2 on the dielectric constant depending on the available resin. If the dielectric constant of the available resin differs only slightly from that of the insulator, the constriction 2 must then have a diameter which kaua is smaller than that of the rest of the inner conductor 1. As a result, the annular groove 3 is then very flat, so that the Fastening part 7 can not safely engage in this. If, on the other hand, the dielectric constant of the available resin i: n equal to that of the insulator is very high, then the constriction 2 must have a very small diameter, including the strength of the inner conductor 1 overall suffers. There are therefore severe restrictions on the resin that can be used.

These disadvantages are avoided in the "connector according to the invention" in that the middle part of the inner conductor in the area of the roughened surface 8 has the same or even a larger diameter as or than that remaining 3 areas of the inner conductor. Therefore, a resin whose dielectric constant is the same can be used that is or lower than that of the isolator 5. Has the However, if the resin used has a higher dielectric constant or a lower line resistance, so may a compensation of the Leitüngswiderstand takes place in that the width and depth of the on the outside of the insulator shaped cutouts 12 accordingly matched will. The compensation of the line resistance can therefore without impairing the secure fit and the Strength of the inner conductor take place, which is not possible in the case of an adjustment of the diameter of the constriction is. In the context of the invention, there are fewer restrictions with regard to the resin that can be used, and the

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Manufacture of the connector is simpler than with known 'methods.

In addition, the insulator is in accordance with the invention Connector by means of an adhesive on the inner surface of the Outer conductor 4 can be fastened so that no holes 6a have to be drilled into the outer conductor 4 for pouring the resin need, as is the case with the known connector according to FIG. It is therefore not necessary to use the Fill holes in the outer conductor 4 with an adhesive and then remove this flush with the outer surface of the conductor.

If an adhesive is used whose dielectric constant is greater than that of the insulator, compensation can be achieved the line resistance can also be achieved in that a correspondingly reduced amount of the adhesive 11 is filled instead of the isolator with the in KLg. 2B is provided. Such an arrangement is shown in FIG. 3, in which the radial bore 10 is only partially filled with the adhesive 11. As a result, the line resistance in the area containing the adhesive 11 is higher than when the radial bore 10 would be completely filled with it, so that a compensation of the line resistance is achieved in an extremely simple manner is.

The above description relates to an embodiment of a double-sided coaxial connector, whose inner conductor has a socket contact at both ends. However, the invention is also applicable to an in Fig. 4- shown coaxial connector, the inner conductor 1 of which has a plug contact 13a at both ends. 13a 'has. In the embodiment of Fig. A-. Has Outer conductor 4- also has a bore 14 aligned with the radial bore 10 of the insulator 5 for pouring in a Adhesive 11, which is then cured. In

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This embodiment results in the hold in the axial direction thus from the engagement of the outer region of the adhesive filling 11 with the bore 14-.

All features and advantages of the invention that emerge from the description, the claims and the drawing, including structural details and spatial arrangements, can be used both on its own and in any combination be essential to the invention *.

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Claims (1)

Sept. 18, 1978 P 13 120 900 Conraerce Drive, Oak Brook, Illinois 60521, USA Claims 1. ) Coaxial connector, characterized by an elongated, essentially cylindrical inner conductor (1) with an essentially continuous outer surface, a contact (1a, 13a) at at least one end thereof and a roughened one extending in the axial direction over part of the same ! Trafangsflache (8), which surrounds a part of the inner conductor, the diameter of which is at least equal to that of the rest of the inner conductor, through an elongated insulator (5) with an axial middle hole (5 ¹ ) for receiving the inner conductor and one extending from the outside of the Insulator for the central bore extending transverse bore (10) ,. whose inner end is close to the roughened circumferential surface of the inner conductor, by a tubular outer conductor (4) in which the insulator is arranged coaxially with the inner conductor contained in its central bore, and by a fastening part (11) made of insulating material, which is arranged in the transverse bore and which is attached to the Outer conductor and engages on the roughened peripheral surface of the inner conductor. 909814/0772 TELEPHONE (CSQ) 22 28 S3 TELEX OB-29 38O TELEGRAMS MONAPTH TELECOPER 2. Coaxial connector according to. Claim. 1, thereby characterized in that the outer conductor (4-) has a roughened peripheral surface (9) on its inner side, that the outer end of the transverse bore (10) to the roughened The peripheral surface of the outer conductor leads and that the fastening part (11) on the roughened peripheral surface of the outer conductor attacks. 3. Coaxial connector according to claim 1, characterized characterized in that the outer conductor (4) from one in the radial direction with the transverse bore (10) of the Insulator (5) aligned bore (14) is penetrated and that the fastening part extends from the roughened surface (8) of the inner conductor through the transverse bore of the insulator and the bore of the outer conductor extends. 4-. Coaxial connector according to claim 1, characterized characterized in that the outside of the insulator (5) in the area of the transverse bore (10) cutouts (12) to the characteristic line resistance to be kept constant over the entire length of the connector. 5. coaxial connector according to claim 1, characterized ge-indicates that the fastening part (11) is made of a solidified resin adhesive, which fills the cross hole (10) up to a certain height, and to keep the characteristic line resistance constant over the entire length of the connector. 6. Coaxial connector according to claim 1, characterized in that the roughened peripheral surface (8) a number of circumferentially spaced in Has axially extending ribs. 7. coaxial connector according to claim 2, characterized in that the roughened circumferential 8098U / 077 2 surface (9) of the outer conductor (4-) a number of adjacent, Has annular grooves. 8. coaxial connector according to claim 1, characterized in that the diameter of the roughened circumferential surface (8) of the inner conductor (1) is greater than that of the rest of the inner conductor. 9 · Eoaxial connector according to claim Ί, characterized characterized in that the roughened surface (8) of the inner conductor (Ί) is corrugated. 10. Eoaxial connector according to claim 2, characterized marked that the roughened peripheral surface (9) of the outer conductor (4-) is corrugated. 909 8 U / 0772