JP4940468B2 - Slip ring - Google Patents

Description

  The present invention relates to a slip ring, and in particular, a shield ring is laminated on both sides of a signal ring, and a shield brush is disposed on both sides of a signal brush that is in sliding contact with the signal ring. The present invention relates to a novel improvement for preventing noise contamination from the outside.

In general, for the transmission and reception of signals such as images, a patent document or the like is not particularly shown, but a stacked configuration shown in FIG. 3 is adopted.
In FIG. 3, what is indicated by reference numeral 1 is a ring body for slip rings in which a plurality of shield rings 2, signal rings 3, and insulating plates 4 are laminated along the axial direction. The shield ring 2 and the signal ring 3 are insulated from each other through the insulating plate 4.

  In the vicinity of the ring body 1, a brush holder 7 in which shield brushes 5 and signal brushes 6 are alternately arranged is disposed, and each shield brush 5 is in sliding contact with each shield ring 2, Each signal brush 6 is in sliding contact with each signal ring 3.

The shield connection line 8 connected to each shield brush 5 is connected to one end 11a of the end surface 11 of the shield part 10 which is the outer skin of the shield line 9, and the signal brush 6 has the shield line 9 A signal line 12 covered with the shield part 10 is connected.
The output side 9a of each shield wire 9 is connected to a receiving circuit side (not shown).

In the above-described configuration, the ring body 1 rotates, and an output signal provided on the ring body 1, for example, from a rotating magnetic head or an electronic circuit, passes through the signal ring 3, the signal brush 6, and the signal line 12. Output to the outside.
An external signal such as an external power supply is transmitted for input to the electronic circuit or the like via the signal line 12, the signal brush 6 and the signal ring 3.

Since the conventional slip ring is configured as described above, the following problems exist.
That is, since the shield ring is provided only on one side of the signal ring and the signal brush, the shielding effect for the signal ring and the signal brush is not sufficient, and external noise is likely to be mixed, and the signal S / N ratio is increased. Had fallen.
In addition, impedance matching is difficult.

A slip ring according to the present invention includes a ring body formed by laminating a signal ring and a shield ring using an insulating plate, and a plurality of signal brushes and shield brushes that are in sliding contact with the signal rings and the shield ring. The signal ring connected to the signal brush, and the shield wire connected to the shield brush and having a shield part for covering the signal line, the rotating signal ring and the signal In the slip ring that transmits and receives signals to and from the signal brush, shield rings are provided on both sides of the signal ring, and the shield brush is disposed on both sides of the signal brush , the each shield ring provided through the insulating plate on both sides of the front SL signal rings, large diameter over than the outer diameter of the signal ring Hang portion is formed, the insulating plate Ri configuration der is arranged, also, before Symbol brush each shield before Symbol the recess of the overhang portion, both ends of the end surface of the cylindrical of the shield wire Are connected via a shield connecting line.

Since the slip ring according to the present invention is configured as described above, the following effects can be obtained.
That is, since the shield ring and the shield brush are disposed on both sides of the signal ring and the signal brush, a sufficient shielding effect for the signal ring and the signal brush can be obtained, and the signal passing through the signal line can be obtained. External noise can be blocked.
Further, since each shield ring is provided with an overhang portion having a diameter larger than the outer diameter of the signal ring, the shielding effect for the signal ring and the signal portion brush can be further enhanced.

  In the present invention, the shield ring is laminated on both sides of the signal ring, and the shield brush is disposed on both sides of the signal brush that is in sliding contact with the signal ring to enhance the shielding effect on the signal ring and the signal brush, and noise from the outside. It is an object of the present invention to provide a slip ring that prevents contamination of the material.

Hereinafter, preferred embodiments of a slip ring according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
What is denoted by reference numeral 1 in FIG. 1 is a ring body for slip rings in which a plurality of shield rings 2, signal rings 3, and insulating plates 4 are laminated along the axial direction. The shield ring 2 and the signal ring 3 are insulated from each other through the insulating plates 4.
That is, in this ring body 1, a pair of shield rings 2 are laminated on both sides of one signal ring 3 via insulating plates 4, and a predetermined number of signal rings 3 are formed by a repeating structure (multilayer type) of this configuration. Are stacked.

  A brush holder 7 having a plurality of signal brushes 6 independent from each other and a pair of shield brushes 5 disposed on both sides of each signal brush 6 is disposed in the vicinity of the ring body 1, The shield brushes 5 are in sliding contact with the shield rings 2, and the signal brushes 6 are in sliding contact with the signal rings 3.

The shield connection line 8 connected to each shield brush 5 is connected to both ends 11a of the end surface 11 of the shield portion 10 which is the outer skin of the shield line 9, and each signal brush 6 includes the shield line 9 The signal line 12 covered with the shield part 10 is connected.
The output side 9a of each shield wire 9 is connected to a receiving circuit side (not shown).

In the above-described configuration, the ring body 1 is rotated, and output signals from, for example, a rotating magnetic head or an electronic circuit provided on the ring body 1 are sent to the signal rings 3, the signal brushes 6, and the signal lines 12. Is output to the outside via
An external signal such as an external power supply is input, that is, transmitted to the electronic circuit or the like via the signal line 12, the signal brush 6, and the signal ring 3.

  Further, since each signal ring 3 is sandwiched between a pair of shield rings 2 and the signal brush 6 is sandwiched between a pair of shield brushes 5, a shielding effect for the signal ring 3 and the signal brush 6 is achieved. Is significantly higher than in the prior art, and it is possible to improve the S / N ratio of the output signal through the shield wire 9 and the input signal to the electronic circuit on the ring body 1 side.

Next, FIG. 2 is a structure which shows the other form of this invention, attaches | subjects the same code | symbol to the part which is the same as that of FIG. 1, or an equivalent, and abbreviate | omits description and demonstrates only a different part.
That is, an overhang portion 30 having a diameter larger than the outer diameter of the signal ring 3 is provided on the signal ring 3 side of each shield ring 2. The overhang portion 30 is provided in the recess 31 of the overhang portion 30. The insulating plate 4 is disposed so as to be accommodated.

  Each overhang portion 30 sandwiches each signal ring 3 and signal brush 6 and covers each signal ring 3, so that the shielding effect is high, and external electric noise is generated by the signal ring. 3 and the signal brush 6 are prevented from being mixed into the input / output signal.

It is a block diagram which shows the slip ring by this invention. It is a block diagram which shows the other form of FIG. It is a block diagram which shows a prior art example.

DESCRIPTION OF SYMBOLS 1 Ring body 2 Shield ring 3 Signal ring 4 Insulation board 5 Shield brush 6 Signal brush 7 Brush holder 8 Shield connection line 9 Shield wire 10 Shield part 11 End surface 12 Signal line

Claims (2)

The signal ring (3) and the shield ring (2) are laminated using an insulating plate (4), and the ring body (1) formed in a multilayer type is slid onto the signal ring (3) and the shield ring (2). A brush holder (7) having a plurality of signal brushes (6) and a shield brush (5) in contact, a signal line (12) connected to the signal brush (6), and the shield brush (5 ) And a shield wire (9) having a shield part (10) for covering the signal line (12),
In the slip ring adapted to send and receive signals between the rotating signal ring (3) and the signal brush (6),
The shield ring (2) is provided on both sides of the signal ring (3), brush the shield on both sides of the signal brush (6) (5) is arranged, prior SL signal ring (3) the each shield ring provided through the insulating plate on either side of (4) (2), the diameter of the overhang portion than the outer diameter of the signal ring (3) (30) is formed, before Symbol features and be away rippling said insulating plate in the recess (31) of the overhang portion (30) (4) is arranged.   Each of the shielding brushes (5) is connected to both ends (11a) of an end surface (11) of the cylindrical shield wire (9) via a shield connection line (8). Item 4. The slip ring according to Item 1.

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