JP2001035610A - F-type connection plug and connection plug seat for coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mixing of a confluent noise by eliminating the influence of the degree of fastening a nut and surely connecting to ground. SOLUTION: An F-type connection plug 21 is composed of a nut 22, a sleeve 23, and a shell 24. In the nut 22, a thread groove 25 is formed inside its opening end side, and its head side is opened in a ring form to be a connection part 26, into which the tip of the shell 24 and the sleeve 23 are inserted. In the sleeve 23, on the outer periphery of a part inserted into the nut 22, an engagement part 27 is formed, and the tip of the inserted part is extended. On the outer periphery of the tip of the extended part, a sleeve protrusion 28 is formed so as to contact with the inside of the shell 24 of a connecting plug seat, and a plurality of slits 29 are formed. When placing the F-type connection plug 21 on the connection plug seat, the sleeve protrusion 28 contacts first with the inside of a shell 32 of the connection plug seat and then, a core conductor of the coaxial cable contacts with a central contact of the connection plug seat and finally, the sleeve protrusion 28 engages with a shell groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an F-type connector for a coaxial cable and a connector seat for reducing inflow noise when a connector is connected to a CATV device, for example.

[0002]

2. Description of the Related Art Conventionally, coaxial cables are used to connect respective devices in, for example, a CATV system, and a dedicated F-type plug is required at the end of the coaxial cable. A conventional F-type connector for a coaxial cable is configured as shown in FIG.

FIG. 5 is a sectional view showing a part of a conventional F-type plug 1. The F-type plug 1 includes an F-type plug nut 2,
It comprises an F-shaped connecting sleeve 3 and a retaining ring 4. The F-type plug nut 2 has a screw groove 5 for screwing with a plug seat inside and an opening at the head, and the periphery of the opening is formed in a ring shape to form a coupling portion 6 with the sleeve 3. And On the other hand, the F-type plug sleeve 3 protrudes an end on the side connected to the F-type plug nut 2 to form a coupling groove 7, and the ring-shaped coupling portion of the F-type plug nut 2 is formed in the coupling groove 7. 6
Are connected to the F-type plug nut 2 from outside. In this case, the ring-shaped connecting portion 6 of the F-type plug nut 2
Is slidably provided in the coupling groove 7 of the F-type connecting sleeve 3. That is, the F-type plug nut 2 is rotatably coupled to the F-type plug sleeve 3.

A coaxial cable 11 is attached to the F-type plug 1. The coaxial cable 11 includes an outer sheath 12, an outer conductor (braided wire) 13, an insulator 14, and a center conductor 15.

When the coaxial cable 11 is attached to the F-type plug 1, the distal end of the F-type plug sleeve 3 is connected to the coaxial cable 1.
1 between the outer conductor 13 and the insulator 14,
From the outside with a retaining ring 4 to secure it. Thereby, the ground connection with the outer conductor 13 of the coaxial cable 11 is performed.

[0006] When the F-type plug 1 constructed as described above is mounted on a plug seat of a device, the thread portion of the plug seat is inserted into the thread groove 5 of the F-type plug nut 2, and the F-type plug is inserted. Rotate the plug nut 2 to fix both. At this time, the center conductor 15 of the coaxial cable 11 is pressed against the center contact of the plug seat to be electrically connected.

[0007]

The above-mentioned conventional F-type plug 1
When the is attached to a plug seat provided in an electronic device, the external shells serving as ground portions come into contact with each other by rotating the F-type plug nut 2 and tightening the screw portion of the plug seat, thereby reducing external noise. It is designed to prevent dive. But,
Depending on the degree of tightening of the F-type plug nut 2, the contact between the outer shells is insufficient, and external noise may jump in, which may disturb the ingress noise of the system. The F-type plug 1 is composed of the F-type plug nut 2 and the F-type plug sleeve 3, but a gap is formed between the F-type plug nut 2 and the F-type plug sleeve 3. Since the ground connection between the F-type plug nut 2 and the F-type plug sleeve 3 is not sufficient, external noise enters from the gap and causes inflow noise.

In order to solve these problems, an F-type plug and a connector seat have been considered in which a signal line is connected after a sleeve of the F-type connector is connected to the connector seat. ,
This F type plug cannot be connected to a standard plug seat which is a standard product, and has a problem that it is not versatile.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is not affected by the degree of tightening of the nut, can be reliably connected to the ground, and can reliably prevent the inflow noise from being mixed. An object of the present invention is to provide an F-type plug for cable and a plug seat.

[0010]

According to a first aspect of the present invention, a ring-shaped connecting portion provided on the head of an F-type plug nut is rotatably connected to a tip of an F-type plug sleeve, and is provided inside the nut. In an F-type connector for a coaxial cable attached to a connector seat by a formed screw groove, an extension portion in which a tip of a sleeve rotatably coupled to a nut of the sleeve is extended to an opening end side of the nut; A sleeve projection provided on the outer periphery of the distal end of the sleeve for contacting the inside of the shell of the plug seat; a plurality of slits provided on the sleeve extension; and fixing means for fixing the position of the coaxial cable attached to the sleeve. And characterized in that:

According to a second aspect of the present invention, a ring-shaped connecting portion provided on the head of the F-type plug nut is rotatably connected to the tip of the F-type plug sleeve, and a thread groove is formed inside the nut. F-type connector and coaxial cable F-type connector and connector seat formed of a connector seat formed on the outside of the shell with a screw portion screwed into the thread groove of the nut. An extension extending the leading end of the coupled sleeve to the opening end side of the nut; a sleeve projection provided on the outer periphery of the leading end of the extension for contacting the inside of the shell of the plug seat; Multiple slits
An F-type plug provided with fixing means for fixing the position of the coaxial cable attached to the sleeve; and an F-shaped plug formed inside the shell opening end of the plug seat, wherein the sleeve projection slides when the F-type plug is mounted. A sliding contact portion, a shell groove to which the sleeve projection fits when the F-type plug is mounted, and a central contact provided at a central portion of the shell and connected to a central conductor of the coaxial cable. And a plug seat provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a partial cross-sectional view showing a configuration of an F-type plug according to an embodiment of the present invention, FIG. 1B is a view of the F-type plug viewed from a nut side, and FIG. FIG. 3 is a partial cross-sectional view showing the structure of the plug seat, FIG. 3 is a view showing the center contact in FIG. 2 taken out, and FIG. 4 is a partial cross-sectional view showing a state when the F-type plug is connected to the plug seat. .

The F-type plug 21 includes an F-type plug nut 22 and an F-type plug nut 22.
It consists of a mold plug sleeve 23 and a shell 24. The F-type plug nut 22 is formed with a screw groove 25 which is screwed with a plug seat having a smaller diameter than the open end 22a on the inner side near the open end 22a, and has a ring-shaped opening on the head side. The connecting portion 26 is connected to the sleeve 23 and the shell 24. The distal end of the shell 24 is inserted into the inside of the connecting portion 26, and the F-type plug sleeve 23 is further inserted into the inside. In this case, the connecting portion 26 of the F-type plug nut 22 and the shell 24 are loosely connected to each other so as to be rotatable. In addition, the F-type plug sleeve 23 has a plurality of cable retaining prevention protrusions 39 on the outer side of the coaxial cable mounting side, and a ring-shaped engaging portion on the outer periphery of a portion inserted into the F-type plug nut 22. 27 is provided to prevent the nut 22 from coming off. Further, the F-type connecting sleeve 2
3 extends the tip inserted into the F-type plug nut 22 to the opening end 22a side of the nut 22 and the outer periphery of the tip of the extension 23a inside the shell of the plug seat 31 shown in FIG. A sleeve projection 28 for contact is provided.
Further, the extension portion 23a is provided with a plurality of, for example, four slits 29 so that a repulsive force is generated when an external force is applied. Further, a cylindrical holding member 30 for holding the center conductor 15 of the coaxial cable 11 is provided in the F-type plug nut 22.

When attaching a coaxial cable to the F-type plug 21, the rear end of the F-type plug sleeve 23 is inserted between the insulator 14 and the outer conductor 13 of the coaxial cable 11, as shown in FIG. The shell 24 is fixed by caulking. As a result, the ground connection between the F-type plug sleeve 23 and the coaxial cable 11 is reliably performed. When the coaxial cable 11 is attached, the central conductor 15 is inserted through the through hole of the holding member 30 and protrudes from the F-type plug nut 22 by a certain length.

On the other hand, the plug seat 31 shown in FIG. 2 has a screw portion 33 formed on the outer periphery of the cylindrical shell 32 to be screwed into the screw groove 25 of the F-type plug nut 22. In this case, the screw part 33 is formed in the shell 32 except for the tip part. Further, the inner diameter of the shell 32 is made slightly smaller than the outer diameter of the sleeve projection 28 to form the sliding contact portion 40,
When the mold plug 21 is inserted into the plug seat 31, the sleeve projection 2
8 surely comes into contact with the sliding contact portion 40.

Further, a ring-shaped shell groove 38 which engages with the sleeve projection 28 is provided at a predetermined distance from the tip of the shell 32. This shell groove 38
The sleeve projection 28 is provided so as to fit when the F-type plug 21 is inserted into the plug seat 31. The depth of the groove is set so that the repulsive force at the tip of the sleeve is not completely eliminated.

A cylindrical member 34 is provided inside the shell 32 and inside the shell groove 38.
At the center, as shown in FIG. 4, a center contact 35 that contacts the center conductor 15 of the coaxial cable 11 is provided. A hole 34a is provided at the center on the distal end side of the tubular member 34, and the center conductor 15 of the coaxial cable 11 is inserted into the center contact 35 through the hole 34a. The center contact 35 has a lead-out portion 37 as shown in FIG. 3 and is held by a holding member 36. This holding member 3
6 is provided at the base in the shell 32, and a part of the center contact 35 and the lead-out portion 3
7 is inserted.

In the above configuration, when the F-type plug 21 is mounted on the plug seat 31, the F-type plug sleeve 23 is attached to the shell 3.
When inserted into the shell 2, the sleeve projection 28 first contacts the inside of the shell 32. A slot 29 is provided at the tip of the F-type plug sleeve 23 so that a repulsive force is generated when an external force is applied, and the inner diameter of the shell 32 is formed slightly smaller than the outer diameter of the sleeve projection 28. So
During the insertion of the sleeve, a repulsive force is always generated, and the sleeve projection 28 is pressed against the inside of the shell 32 to ensure the earth connection.

Further, the F-type plug sleeve 23 is connected to the shell 32.
Then, the center conductor 15 of the coaxial cable 11 is inserted into the center contact 35 while the ground connection is maintained. When the F-type plug sleeve 23 is inserted into the shell 32 to the end, the sleeve projection 28 is engaged with the shell groove 38. At this time, the depth of the shell groove 38 is set so that the repulsive force of the sleeve projection 28 does not completely disappear, so that the F-type connecting sleeve 23 and the shell 3
While the ground connection of No. 2 is securely maintained, it is in a state in which it is not easily removed. By tightening the F-type plug nut 22 in this state, the F-type plug 21 is securely attached to the plug seat 31,
Even if a large external force is applied, it does not come off easily.

When the F-type plug 21 is mounted on the plug seat 31 as described above, the F-type plug sleeve 23 and the shell 32 are always kept in the ground connection state, so that it is possible to prevent external noise from jumping in. The occurrence of ingress noise can be reliably prevented. Further, even if the F-type plug nut 22 is loosened for some reason after the attachment, the F-type plug sleeve 23 and the shell 32 are always kept in contact with each other.
It is not affected by extraneous noise. Therefore, since it is not affected by the degree of tightening of the F-type plug nut 22, it is not necessary to tighten the nut with a strong force by a tool. The F-type plug 21 can be easily and reliably attached to the plug seat 31 even in a place or a dark place.

Further, the F-type plug 21 can be used by connecting to a standard plug seat which is a standard product. In this case, the ground connection by the sleeve projection 28 is not performed, but the same function as the conventional one can be obtained.

In the above embodiment, the case where the shell 24 is provided as the cable fixing means in the F-type plug 21 is shown. However, the retaining ring is provided to fix the coaxial cable 11 in the same manner as in the prior art. Is also good.

[0023]

As described above in detail, according to the present invention, F
The end of the mold plug sleeve is extended, and a sleeve protrusion is provided at the end, so that the sleeve protrusion directly contacts the shell of the plug seat. It is possible to reliably prevent the occurrence of ingress noise due to the entry of external noise.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional view showing a configuration of an F-type connector for a coaxial cable according to an embodiment of the present invention, and FIG. 1B is a view of FIG. 1A viewed from a nut side.

FIG. 2 is a partial cross-sectional view showing the configuration of the plug seat in the embodiment.

FIG. 3 is a view showing a central contact in FIG. 2;

FIG. 4 is a partial cross-sectional view showing a state where the F-type plug in the embodiment is attached to a plug seat.

FIG. 5 is a partial cross-sectional view showing a configuration of a conventional F-type connector for a coaxial cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Coaxial cable 12 Outer sheath 13 Outer conductor 14 Insulator 15 Center conductor 21 F type plug 22 F type plug nut 22a Open end 23 F type plug sleeve 23a Extension part 24 Shell 25 Screw groove 26 Joining part 27 Engagement part 28 Sleeve projection 29 Slot 30 Holding member 31 Plug seat 32 Cylindrical shell 34 Cylindrical member 35 Center contact 36 Holding member 37 Deriving section 38 Shell groove 39 Cable retaining prevention projection 40 Sliding contact section

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission Date] May 8, 2000 (2000.5.8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

According to the present invention , a ring-shaped connecting portion provided at the head of an F-type plug nut is rotatably connected to the tip of an F-type plug sleeve, and a thread groove is provided inside the nut. A coaxial cable F-type plug and a plug seat comprising a plug seat having a threaded portion formed on the outside of the shell, the F-type plug and the thread being screwed into the thread groove of the nut; An extension extending from a tip end of a sleeve rotatably coupled to the opening end side of the nut; a sleeve projection provided on an outer periphery of a tip end of the extension to contact the inside of the shell of the plug seat; An F-type plug including a plurality of slits provided on the extension portion and fixing means for fixing the position of the coaxial cable attached to the sleeve; and an F-type plug formed inside the shell opening end of the plug seat, When installing the F-type plug, A sliding contact portion which blanking projections sliding contact, the F
When the mold contact plug is mounted, the sleeve projection is篏合, or
To a depth where the resilience of the sleeve projection remains.
It is characterized by comprising a set shell groove and a plug seat provided at a central portion of the shell and provided with a central contact connected to a central conductor of the coaxial cable.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Deleted

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noriyuki Gomeki 1406 Hasunuma, Omiya City, Saitama Prefecture Yagi Antenna Inside the Omiya Plant (72) Inventor Haruo Kato 251 Kuji, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Inside

Claims (2)

[Claims] 1. A ring-shaped coupling portion provided on the head of an F-type plug nut is rotatably coupled to a tip of an F-type plug sleeve, and is attached to a plug seat by a thread groove formed inside the nut. An F-type plug for a coaxial cable, wherein an extension of a sleeve tip rotatably coupled to the nut of the sleeve is extended to the open end side of the nut; A sleeve projection for contacting the inside of the shell, a plurality of slits provided in the sleeve extension, and fixing means for fixing the position of a coaxial cable attached to the sleeve. F-type plug for cable. 2. An F-type connector comprising a ring-shaped coupling portion provided on the head of an F-type plug nut rotatably coupled to a tip of an F-type plug sleeve, and a thread groove formed inside the nut. A coaxial cable F-type plug and a plug seat formed of a plug seat formed on the outside of the shell with a screw portion screwed into the screw groove of the plug and the nut, and are rotatably connected to the nut of the sleeve. An extension extending the sleeve tip to the opening end side of the nut; a sleeve projection provided on the outer periphery of the tip of the extension for contacting the inside of the shell of the plug seat; and a plurality of sleeves provided on the sleeve extension. An F-type plug provided with a slit and fixing means for fixing the position of the coaxial cable attached to the sleeve; formed at the inside of the shell opening end of the plug seat; Sliding contact part where sleeve protrusion slides A plug groove provided with a shell groove to which the sleeve protrusion fits when the F-type plug is fitted, and a center contact provided at a center of the shell and connected to a center conductor of the coaxial cable; An F-type plug and a plug seat for a coaxial cable, characterized by comprising: