JPH011101A - slip ring contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is applicable to a video tape recorder (VTID) in which a printed circuit board for an amplifier (hereinafter simply referred to as a printed circuit board) is mounted on a rotating drum. In particular, it relates to a slip ring contact used for supplying power supply current from a so-called fixed side and for exchanging signals with a printed circuit board.

[Summary of the Invention] The present invention includes attaching a slip ring made of a conductive material to the circumferential surface of a rod made of a non-conductive material, and
A slip ring contact is formed at the lower end of the rod, and can be attached to the rotating shaft side by fitting the slip ring lead leading part into a connector provided on the rotating shaft side. In this case, a slip ring lead terminal is provided on the circumferential surface of the slip ring lead lead-out part, and the slip ring lead terminal and the slip ring are connected to each other within the rod and the slip ring lead lead-out part. , By fitting the slip ring lead lead-out portion to a connector provided on the rotating shaft side, mechanical connection and electrical connection between the connector and the slip ring contact are simultaneously achieved.
And it is designed to be easy to perform.

[Prior art] When a printed circuit board is mounted on the rotating drum side of a VTR, slip ring contacts are used to supply power current to the printed circuit board and magnetic head, and to exchange signals with the printed circuit board. is used.

A slip ring contact is generally a slip ring I made of a conductive material such as copper, as shown in Figure 11.
... I, a rod 2 made of a non-conductive material such as plastic to which these slip rings are attached to the circumferential surface, and a slip ring lead lead-out portion provided at the lower end of the rod 2. 3, the power supply current introduced from the fixed side via the brush 4 in contact with the slip ring lead 1 is supplied from the slip ring lead lead-out part 3 to the printed circuit board 5, 5
It is now possible to send and receive signals between the two.

[Problems to be Solved by the Invention] As shown in FIG.・・８
It is designed to be attached to the rotating bearing member 10 of the rotating drum 9, and also has a lead wire outlet provided on the circumferential surface of the slip ring lead outlet part 3! From ■, pull out the other end of the slip ring lead wire 12...12 whose one end is electrically connected to the slip ring I, and connect its tip electrically to the printed circuit board 5 with solder 13. Because of the connection, there were problems as described below.

(1) In order to use the screw...8, the rotary bearing part 11
The work of attaching the slip ring contact 6 to the 0 is troublesome.

(2) Work efficiency is poor because the mechanical installation work and the electrical connection work of the slip ring contact 6 are performed separately.

(3) When it is necessary to replace the slip ring contact 6 with a new one, solder 13 each time.
... Melt I3 and attach slip ring lead wire 12.
...Since I2 must be removed from the printed circuit board 5, removal or replacement work is troublesome.

(4) Slip ring lead wire 12...Fog is likely to occur due to radiation from I2.

In order to solve the above problems, a cylindrical connector is attached to the rotating bearing member 10, and the slip ring lead lead-out portion 3 is fitted to the connector, so that the slip ring contact is connected to the rotating bearing member 10. A mounting method has also been developed, but because of the nature of fitting the slip ring lead lead-out part 3 into the connector, it is easier to attach the slip ring contact to the rotating bearing member side than the conventional method using screws. Although it has the advantage of being able to be attached mechanically, it has not yet solved the problems mentioned in items (2) and (3) above.

The present invention has been made for the purpose of providing a slip ring contact that can easily solve the problems in items (2) and (3) above.

[Means for solving the problem] A slip ring made of a conductive material, a rod made of a non-conductive material attached to the circumference of the slip ring, and a rod made of a non-conductive material provided at the lower end of the rod. The slip ring lead lead-out part is fitted into a cylindrical connector provided on a rotating bearing member, a printed circuit board, etc., and the slip ring lead lead-out part is fitted to a cylindrical connector provided on a rotating bearing member, a printed circuit board, etc. In a slip ring contact configured to perform They were connected to each other by lead wires.

[Function] By fitting the slip ring lead lead-out part to the connector, it is possible to mechanically attach the slip ring contact to the rotating bearing member or printed circuit board side, and also to attach the slip ring lead lead-out part to the peripheral surface of the slip ring lead lead-out part. Since a slip ring lead terminal is provided, one end of the lead terminal on the printed circuit board side that is connected to the printed circuit board should be made to protrude toward the inner peripheral surface of the connector, and the slip ring lead lead-out portion should be fitted into the connector. At this time, if these slip ring lead terminals and the connector terminals on the printed circuit board are in contact with each other, mechanical attachment of the slip ring contacts and electrical Connections can be made simultaneously.

[Example] Next, the present invention will be explained with reference to FIGS. 1 to 10.

In FIG. 1, 21 is a slip ring contact of the present invention. This slip ring contact 21 includes a slip ring 22 made of a conductive material such as copper...
22, a cylindrical rod 23 made of a non-conductive material such as plastic, on which the slip rings 22...22 are attached at a predetermined interval d, and a cylindrical rod 23 made of a non-conductive material such as plastic, which is connected to the lower end of the rod 23. A slip ring lead lead-out portion 24 is provided. The slip ring lead lead-out portion 24 is made of the same material as the rod 23 and is formed into a cylindrical shape with a larger diameter than the rod 23, and has a number of holes corresponding to the slip rings 22...22 on its circumferential surface. Slip ring lead terminals 25...25 are provided radially. These slip rings 22 . . . 22 and slip ring lead terminals 25 .
... are connected to each other by 26.

To briefly explain an example of the method of manufacturing the slip ring contact 21, first, as shown in FIG. 4, the protrusions 28... which become the slip ring lead terminals 25...
A cylindrical body 29 is formed in which 28 are provided radially on the inner peripheral surface, and the protrusions 28...28 and slip rings 22...22 are formed.
are connected with lead wires 26...26. Then, these cylindrical bodies 29 to slip rings 22...22 are set in the plastic molding mold 30 as shown in FIG. Set the core metal 32 with the rotary shaft fitting part 3K at the lower end, then inject molten plastic into the mold 30 as shown in Fig. 6, and solidify it to form the metal core 32 shown in Fig. 7. A member 33 as shown is produced. At the same time, the annular portion 34 of the cylindrical body 29 is cut and deleted leaving the protrusions 28...28, and the slip ring 22...
If brush receiving grooves are cut on the circumferential surfaces of the slip rings 22, as shown in FIG. 2, the lead wires 26 connecting the slip rings 22, . 26 is embedded in the plastic to form a slip ring contact 21 that can almost completely prevent the leads 26 . . . 26 from becoming disconnected. Reference numeral 35 denotes a positioning groove provided on the circumferential surface of the slip ring lead lead-out portion 24 in parallel with the slip ring lead terminal 25. 'And the slip ring contact 21 is attached to the printed circuit board 37 side and used by fitting the slip ring lead lead-out portion 24 into a connector 36, which will be described below.

The connector 36 is made of non-conductive plastic and has a cylindrical shape, and is attached to the printed circuit board 37 or the rotary bearing member 40 of the rotary drum 39 so that its axis coincides with the axis of the rotary shaft 38. Further, as shown in FIG. 8, a positioning protrusion 41 is formed on the inner peripheral surface of the connector 36, and when the slip ring lead lead-out portion 24 is inserted into the connector 36, the positioning groove 35 The protrusion 41 is fitted into the slip ring lead lead-out portion 2.
4 is positioned, and the tip of the rotating shaft 38 is fitted into the rotating shaft fitting portion 31. The connector 36 also has slip ring lead terminals 25...25 of the slip ring lead lead-out portion 24 inserted therein.
Connector pins 42 . . . 42 are attached at positions corresponding to . These connector pins 42...42 are the first
As shown in the θ diagram, there is a conductive cylindrical base 44 provided with a connection piece 43 to the printed circuit board 37 on one end side, and the cylindrical base 4
4, a conductive head 45 that is removably fitted into the cylindrical base 44;
The head 45 is made to protrude from one end of the coil spring 46. These connector pins 42
... 42 is attached with the connecting piece 43 protruding from the outer circumferential surface of the connector 36 and the head 45 protruding from the inner circumferential surface of the connector 36, and the connecting piece 43 is attached to the printed circuit board 37. They are connected with solder 47.

Then, the slip ring lead lead-out portion 2 is attached to the connector 36.
4, the slip ring lead terminals 25...25 provided on the circumferential surface of the connector pins 42...42 come into contact with the heads 45 of the connector pins 42...42, and these heads 45 are subjected to the spring force of the coil spring 46. It is designed to resist and push down.

In FIG. 1, 48 is a brush whose tip 48a is in contact with the slip ring 22, 49 and 50 are nuts and washers that fix the rotating bearing member 40 to the rotating shaft 38, 51 is a fixed drum, and 52 is a brush. A bearing 53 rotatably supports the rotating shaft 38 with respect to the fixed drum 51.
is a rotary transformer.

Since the slip ring contact contact 21 of the embodiment has the above-described configuration, when the slip ring lead lead-out part 24 is pushed into the connector 36, the slip ring lead terminals 25...25 provided on the circumferential surface of the lead-out part 24 are opened. The heads 45...45 of the connector pins 42...42 provided in the connector 36 come into contact with each other, and these heads 45...45 are pushed down against the spring force of the coil spring 46, and the slip ring leads The lead-out portion 24 fits into the connector 36.

Therefore, the heads 45...4 of the connector pins 42...42
Due to the spring force of the coil springs 46...46 acting on the coil springs 5, the slip ring lead lead-out portion 24 is securely installed in the connector 36, that is, mechanically connected, and the slip ring lead lead-out portion 24 is firmly attached to the connector 36, that is, mechanically connected. Part 2
Slip ring lead terminal 25 provided on the circumferential surface of 4...
25 is also electrically connected to the lead terminals of the printed circuit board 37 via the connector pins 42...42.

Although the embodiment shown in the drawings shows a case where the slip ring contact of the present invention is used in a rotating drum device of a VTR, the present invention is not limited to this.

[Effects of the Invention] Since the slip ring contact of the present invention has the configuration as described above, it has the following effects.

(1) The lead wire that connects the slip ring and the slip ring lead terminal is completely embedded in the rod and the plastic material that makes up the slip ring lead lead-out part, so both ends of the lead wire It is possible to prevent the connection between the slip ring and the slip ring lead terminal from becoming disconnected.

(2) By providing a connector terminal that presses against the slip ring lead terminal on the inner periphery of the connector into which the slip ring lead-out part is fitted, both mechanical and electrical connection of the slip ring contact to the connector can be achieved. Can be done at the same time.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the slip ring contact of the present invention in use, FIG. 2 is a front view of the slip ring contact,
Figure 3 is a plan view of the same, Figure 4 is a perspective view of a cylindrical body with protrusions on the inner circumferential surface that serve as springs and slip ring lead terminals, and Figure 5 is a slip ring and cylindrical body set in a mold. Figure 6 is a cross-sectional view of the mold filled with molten resin, Figure 7 is a front view of the slip ring contact before finishing, and Figure 8 is a plan view of the connector. , FIG. 9 is a sectional view taken along line IX--IX in FIG. 8, FIG. 10 is a sectional view of the connector bin, and FIG. 1f is a sectional view of the conventional example. 21... Slip ring contact, 22... Slip ring, 23... Rod, 24... Slip ring lead-out portion, 25... Slip ring lead terminal. 21---Suri 7°l Nonfu" Koyutakuta 22-':
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7 Gamma side Eri Figure 1-61

Claims (1)

[Claims] A slip ring made of a conductive material, a rod made of a non-conductive material to which the slip ring is attached on the circumference, and a slip ring lead provided at the lower end of the rod. In the slip ring contact, the slip ring contact is equipped with a lead-out part and can be attached to the rotating shaft side by inserting the slip ring lead lead-out part into a connector, the slip ring lead lead-out part having: A slip ring contact characterized in that a slip ring lead terminal is provided, and the slip ring lead terminal and the slip ring are connected to each other by a lead wire within a rod and a slip ring lead lead-out portion.