JPH07135060A - Rotary repeater - Google Patents

Abstract

PURPOSE:To provide a rotary repeater by which an electromagnetic wave is not leaked and mechanical abrasion is reduced. CONSTITUTION:A fixed side central conductor 34 is arranged in a space 32 arranged in a conductive fixed side main body 20. A rotary side central conductor 48 is arranged in an internal space 44 of a conductive rotary side main body 42 having a space inside. The fixed side central conductor 34 and the rotary side central conductor 48 approach each other, and are situated almost on the same straight line. A flange shaped part 56 arranged on the lower end of the rotary side main body 42 is arranged in a noncontact condition in a recessed place 28 arranged in the fixed side main body 20, and the rotary side main body 42 is arranged rotatably with the central conductors 34 and 48 as almost the rotational center, and a conductive bearing 58 is arranged between the fixed side main body 20 and the rotary side main body 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater used for transmitting a signal from or to a device provided on a rotating body, and particularly to a cable for transmitting and receiving a signal so as not to be twisted. In addition, the present invention relates to a rotary repeater that is partially rotatable with rotation of a rotating body.

[0002]

2. Description of the Related Art Conventionally, as a rotary repeater as described above, for example, there is one disclosed in Japanese Patent Laid-Open No. 2-224401. As shown in FIG. 4, this is a fixed rotary joint 2a and a rotary rotary joint 2b.
Both rotary joints 2a and 2b have outer shells 4a and 4b made of a conductive metal. These outer shells 4
The outer conductors 6a and 6b of the coaxial cable are fixed to the a and 4b by bolts 8a and 8b, and the center conductors 10a and 10b of the coaxial cable are arranged in the outer shells 4a and 4b, and the tip portions of these are Both center conductors 10a, 1
Spiral element 12 for connecting 0b in super high frequency
a and 12b are provided in a non-contact state.

The outer shells 4a, 4b have flange portions 14a,
14b are provided respectively, and both outer shells 4a and 4b are arranged in a state where they are in contact with each other. As a result, the outer conductors of the coaxial cables connected to the outer shells 4a and 4b are electrically connected. And these flange parts 1
4a and 14b are sandwiched by coupling plates 16a and 16b from above and below.

The coaxial cable of the rotary side rotary joint 2b is connected to, for example, a converter attached to a satellite broadcast receiving antenna provided on the rotary table for automatic satellite broadcast tracking, and the coaxial cable of the fixed rotary joint 2a. The coaxial cable is connected to a tuner for receiving satellite broadcasting. In this rotary repeater, the satellite broadcast receiving antenna on the rotary base rotates, and the coaxial cable connected to the rotary joint 2b rotates accordingly.
Since the rotary joint 2b on the rotation side also rotates, the coaxial cable is not twisted.

[0005]

However, in such a rotary repeater, since the fixed-side rotary joint 2a and the flange portions 14a and 14b of the rotary-side rotary joint 2b are in contact with each other, they are not used for a long period of time. The rotary joint 2b on the rotating side may be worn.
Further, in order to facilitate the rotation of the rotary side rotary joint 2b, the coupling plate 16a does not press the flange portion 14b firmly, so that when the rotary side rotary joint 2b rotates, the coupling plate 16a does not contact the rotary side rotary joint 2b. If a force is applied along the length direction for some reason, a gap is created between the flanges 14a and 14b, and electromagnetic waves may leak.

[0006]

In order to solve the above problems, the present invention provides a conductive fixed side main body having a space inside, and a fixed type fixed inside the fixed side main body. A side center conductor, an electrically conductive rotating side body having a space inside, and a rotating side center conductor arranged in the space of the rotating side body, wherein the fixed side center conductor and the rotating side center are provided. The conductor and the conductor close to each other on substantially the same straight line, and the fixed side and the rotating side main bodies are arranged in a non-contact state, and the rotating side main body makes the rotating side and the fixed side center conductors substantially the center of rotation. A conductive bearing means is rotatably provided between the fixed side body and the rotating side body.

In addition, in a state of rotating together with the rotating main body,
And a contactor provided on the rotating side body in an insulating state from the rotating side body, and an insulator provided on the fixed side body,
An electrode body provided in contact with the contactor may be added to the insulator, and the insulator may fix the bearing means.

[0008]

According to the present invention, the rotating side main body is rotatable with respect to the fixed side main body by the bearing means. Therefore,
The rotating side body and the fixed side body can be brought into non-contact with each other, and no wear occurs. Furthermore, since the bearing means is electrically conductive, no radio wave leakage occurs. Further, when a contactor, an insulator or an electrode body is provided, a low frequency or direct current signal can be transmitted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotary repeater according to this embodiment has a fixed side main body 20 as shown in FIG. This fixed side body 2
0 is made of a conductive metal and is formed in a substantially short cylindrical shape. A connector portion 22 is formed at the central portion of the lower surface of the fixed body 20 in FIG. 1 so as to project downward. Between the peripheral portion of the lower surface and the connector portion 22, stepped portions 24, 24 used for fixing the fixed side main body portion 20 to an appropriate support base are formed.

A sleeve-like portion 26 is formed on the peripheral portion of the upper surface of the fixed side body 20 so as to project upward. In addition, at the center of the upper surface of the fixed-side body 20, a recess 28 is formed that is recessed toward the inside.
A space 32 is formed from the center of the recess 28 to the protruding portion 22, and a fixed-side center conductor 34 is arranged in the space 32 so as to be located at the center of the space 32. A hollow portion 36 is arranged in the center of each of the bodies 35 and 37. This insulator 35 is fixed to the fixed body 10.
The inner wall of the inside is crimped from the inside to fix the insulator 35 and the fixed-side center conductor 34.

Therefore, the fixed side main body 20, the fixed side center conductor 34, the insulator 35, and the cavity portion 36 form a coaxial transmission line. A male screw 3 is provided on the peripheral portion of the connector portion 22.
8 is formed, and the insulator 3 is attached to the male screw 38 and the center conductor 34.
7 is arranged, and the outer shell of a connector (not shown) connected to the coaxial cable is coupled to this, and the center pin of this connector is electrically connected to the fixed-side center conductor 34. The connector (not shown) is connected to, for example, a satellite broadcast receiving tuner by the coaxial cable.

A connecting portion 40 is provided at the end of the fixed-side central conductor 34 on the recess 28 side. This connection 4
0 is Japanese Patent Laid-Open No. 2-224401 and Japanese Patent Laid-Open No. 3-41.
As disclosed in Japanese Patent No. 801, a spiral circuit of a microstrip line formed by etching a printed board.

As shown in FIG. 2, a hole 41 for inserting the fixed-side center conductor 34 is formed at the center of the connecting portion 40. The hole 41 is a through hole, and the wall surface of the hole 41 also has solder. Are attached and soldered to the fixed-side center conductor 34. Since the soldering is performed from the pattern forming surface side of the connection portion 40, even if the solder rises, the solder should be positioned deeper than the recess 28 so as not to come into contact with the connection portion 54 provided on the rotation-side main body 42 described later. The connection portion 40 is arranged in the. The cavities 33 and 57 of FIG. 2 are provided between the fixed-side center conductor 34 and the recess 28.

Further, this rotary repeater includes a rotary side main body 42.
I also have. The rotation-side main body 42 is also made of a conductive metal, and is formed in a substantially elongated cylindrical shape having a space 44 inside, and the lower end portion in FIG. 1 is arranged in the recess 28 of the fixed-side main body 20 and the upper end portion. A connector portion 46 is formed on the. At the center of the space 44, a rotation-side center conductor 48 is arranged along the vertical direction. And
An insulator 49 is arranged in the connector portion 46 around the rotation-side center conductor 48, and an insulator 51 is arranged below the insulator 49 with a cavity 50 interposed therebetween. The insulator 51 fixes the insulator 51 and the rotation center conductor 48 by caulking the inner wall of the cavity 53 in the rotation-side main body 42 from the inside. Therefore, the rotation-side main body 42, the rotation-side center conductor 48, the cavities 50 and 53, and the insulator 51 form a coaxial transmission line.

A male screw 52 is formed on the outer peripheral portion of the connector portion 46, and an outer shell of a connector (not shown) connected to the coaxial cable is joined to the male screw 52. It is electrically connected to the central conductor 48. The connector (not shown) is connected to, for example, a converter attached to a satellite broadcast receiving antenna provided on the rotating body via the coaxial cable. At the lower end of the central conductor 48, a connecting portion 54 similar to the connecting portion 40 is provided.
Are attached in the same manner as the connecting portion 40. These connecting portions 40 and 54 are connected with each other in a super high frequency manner.

Further, a flange-like portion 56 is formed on the peripheral portion of the lower end portion of the rotary side main body 42, and the flange-like portion 56 is arranged in a non-contact state with the recess 28 of the fixed side main body 20. . A gap between electrodes is provided between the flange portion 56 and the recess 28 of the fixed-side main body 20, and grounds are electromagnetically connected in the ultra-high frequency band.

The rotating-side main body 42 and the fixed-side main body 20 are coupled by a bearing 58. By providing the bearing 58, the rotating-side main body 42 is fixed to the fixed-side center conductor 34.
And the rotation side center conductor 48 rotates about the rotation center.

The bearing 58 is a ball bearing as shown enlarged in FIG. 2, and the inner ring 58a, the outer ring 58b, and the bearing 58c provided therebetween are all made of conductive metal. The inner ring 58a is arranged on a step portion 60 formed on the upper portion of the flange-shaped portion 56, and is fixed by a holding ring 61 arranged on the upper portion thereof as shown in FIG. The outer ring 58b is fixed to a stepped portion 63 provided at the same height as the stepped portion 60 on the peripheral wall of the recess 28 of the fixed-side main body 20.

Therefore, as described above, the rotation-side main body 42 is rotatable, and no gap is formed between the fixed-side main body 20 and the rotation-side main body 42 during rotation. Moreover, the bearing 5
Since 8 is made of a conductive metal, the rotating side body 4
2 and the fixed-side main body 20 are electrically connected and shielded. Since the connecting portions 40 and 54 are connected to each other at an ultra-high frequency, even if the rotary table rotates, the signal from the converter on the rotary table is supplied to the tuner via the rotary repeater.

FIG. 3 shows an example in which the rotary repeater shown in FIG. 1 is provided with a slip ring to enable transmission and reception of direct current, for example. Note that, in FIG. 3, the center conductors 34 and 48 and the insulators 24 and 50 are not shown in order to simplify the drawing.

On the upper surface of the stationary body 20, the rotating body 4 is attached.
A fixed-side insulator 62 is provided so as to surround 2. The fixed-side insulator 62 is fixed to the fixed-side main body 20 with a screw or the like (not shown), and the outer ring 58b of the bearing 58 is pressed and fixed to the stepped portion 63. In this way, since the inner ring 58a of the bearing 58 is pressed by the pressing ring 61 and the outer ring 58b of the bearing 58 is pressed by the fixed side insulator 62, even if a force is applied to the rotating side body 42 in the vertical direction, the inner ring 58a is pressed. 58a, the outer ring 58b, and the rotation-side main body 42 do not move, and no gap is formed.

An annular inner electrode 64 and an outer electrode 66 are concentrically formed on the upper surface of the fixed side insulator 62, and a projecting portion 68 is also formed to insulate between them. The inner electrode 64 and the outer electrode 66 are each connected to a power supply terminal of a DC power supply, for example.

A rotating side insulator 70 is provided around the rotating side body 42 and is fixed to the rotating side body 42 by a screw or the like (not shown). Therefore, as the rotation-side main body 42 rotates, the rotation-side insulator 70 also rotates. The inner electrode 64 and the outer electrode 66 on the lower surface of the rotating side insulator 70
Holes 72 and 74 are formed from the position corresponding to the inside toward the inside of the rotating side insulator 70.

Contacts, for example, carbon brushes 76 and 78, are provided in the holes 72 and 74, respectively, for the inner electrode 64 and the outer electrode 6.
6 are arranged so as to contact with each other. Further, in order to make this contact firm, carbon brushes 76 and 78 are provided in the holes 72 and 74, respectively.
Springs 80 and 82 are provided to press the 6 side.

One ends of copper wires 84 and 86 are connected to the carbon brushes 76 and 78, respectively, and the other ends thereof are connected to terminal blocks 88 and 90 provided on the upper surface of the rotating side insulator 70. The terminal blocks 88 and 90 are connected to a power source such as an IC built-in drive motor for adjusting an elevation angle or an azimuth angle of an antenna for satellite broadcast reception, which is provided on a rotary table (not shown).

Therefore, when the rotating body 42 rotates and the rotating insulator 70 rotates accordingly, the carbon brushes 76 and 78 also rotate while sliding on the inner electrodes 64 and the outer electrodes 78, and the current flows through the terminal block 88. The power is supplied from 90 to the power source of the IC drive motor. The copper wires 84, 86
Is wound in a coil, and this is because even if the carbon brushes 76 and 78 wear and become short due to long-term rotation,
This is to prevent the copper wires 84 and 86 from pulling the carbon brushes 76 and 78.

In the above embodiment, the inner ring 58a of the bearing 58 is used.
The outer ring 58b with the holding ring 61
Although the bearing 58 is fixed by pressing each of them with, they may be press-fitted between the fixed-side main body 20 and the rotating-side main body 42. In this case, the pressing ring 61 is unnecessary. Further, in the above embodiment, the direct current was transmitted using the inner electrode 64, the outer electrode 66, the carbon brushes 76, 78, etc., but a low frequency signal may be transmitted instead of the direct current.

[0028]

As described above, according to the present invention, the stationary side body and the rotating side body are arranged in a non-contact state, and the stationary side body and the rotating side body are arranged so that the rotating side body is rotatable. Since a conductive bearing means is provided between the two, even if it is used for many years, the fixed side and rotating side bodies do not wear,
Further, since the shield is surely performed, the electromagnetic wave does not leak. In addition, since the contact is provided on the rotating body while rotating with the rotating body, the insulator is provided on the stationary body, and the electrode body is provided on the insulator so as to be in contact with the contact. It can also transmit current and low frequency signals. Furthermore, since the insulator presses the bearing means, the bearing means does not move.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a rotary repeater according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of the embodiment.

FIG. 3 is a partially omitted vertical sectional view showing a state in which a device for direct current transmission is added to the embodiment.

FIG. 4 is a vertical cross-sectional view of a conventional rotary repeater.

[Explanation of symbols]

 20 Fixed Side Main Body 32 Space 34 Fixed Side Central Conductor 42 Rotating Side Main Body 44 Space 48 Rotating Side Central Conductor 58 Bearing 62 Fixed Side Insulator 64 Inner Electrode 66 Outer Electrode 76 78 Carbon Brush (Contactor)

Claims (3)

[Claims] 1. A conductive fixed-side main body having a space inside, a fixed-side center conductor arranged in the fixed-side main body in the space, and a conductive rotating-side main body having a space inside. A rotation-side center conductor disposed in the space of the rotation-side main body, wherein the fixed-side center conductor and the rotation-side center conductor are positioned close to each other on substantially the same straight line, and Side and rotating side main bodies are arranged in a non-contact state, and the rotating side main body is rotatable about the rotating side and fixed side center conductors as the center of rotation and is electrically conductive between the fixed side main body and the rotating side main body. A rotary repeater provided with bearing means. 2. The rotary repeater according to claim 1, wherein a contact provided on the rotary side main body in a state of rotating with the rotary side main body and in an insulating state from the rotary side main body,
A rotary repeater comprising an insulator provided on the fixed-side main body, and an electrode body provided on the insulator so as to be in contact with the contactor. 3. The rotary repeater according to claim 2, wherein the insulator fixes the bearing means.