JPH01672A - Connection structure of 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 provides a video tape recorder (VTR) in which a printed circuit board for an amplifier (hereinafter simply referred to as a printed circuit board) is mounted on a rotating drum. It is used to mechanically and electrically connect slip ring contacts, which are used to supply power supply current to the head from the so-called fixed side and to exchange signals with the printed circuit board, to the rotating drum side. The present invention relates to a slip ring contact connection structure suitable for use.

[Summary of the Invention] The present invention provides a plurality of slip rings that rotate while contacting a brush provided on a stationary side at predetermined intervals in the axial direction, and a slip ring lead lead-out portion connected to the slip ring at one end. A slip ring contact connection structure in which a slip ring contact having a slip ring is mechanically connected (attached) to a rotating shaft side, and the slip ring lead lead-out part is electrically connected to a lead part of a printed circuit board, A cylindrical connector into which a slip ring lead lead-out portion provided at one end of the ring contact is fitted is provided on the rotating shaft or printed circuit board side, and the cylindrical connector has one end connected to the printed circuit board and the other end connected to the printed circuit board. A plurality of connector terminals having side heads protruding in the axial direction from the inner circumferential surface of the connector are provided radially, and when the slip ring lead lead-out portion is fitted to the connector, a plurality of connector terminals are provided radially on the circumferential surface of the slip ring lead lead-out portion. The head of the connector terminal should be in contact with the provided slip ring lead terminal (by fitting the slip ring lead lead-out part to the connector, the slip ring lead should be connected to the rotation axis of the slip ring contact or to the printed circuit board side). The mechanical connection (installation) of the slip ring contact and the electrical connection between the slip ring lead terminal on the slip ring contact side and the contact terminal on the printed circuit board side can be made simultaneously.

[Prior Art] In a VTR, when a printed circuit board is mounted on the rotating drum side, 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.

As shown in Fig. 7, a conventional slip ring contact is generally provided with a large number of slip rings 2...2 that rotate while contacting a fixed side brush ring 2 at predetermined intervals, and one end (lower end) of the slip ring contact. is constructed by providing a slip ring lead lead-out portion 3 connected to the slip rings 2 . It is attached to the core.

[Problems to be Solved by the Invention] By the way, as shown in FIG. 7, the conventional slip ring contact 7 uses a screw receiving flange 8 provided at the lower end of the slip ring lead lead-out portion 3, and the screw 9... A slip ring lead wire 10 is attached to the rotating bearing member 5 of the rotating drum 4 at 9, in other words, it is mechanically connected, and one end side is electrically connected to the slip ring 2...2.・The other end of IO was led out from the opening 11 provided in the slip ring lead lead-out portion 3 to the outside of the slip ring contact 7, and was electrically connected to the printed circuit board 13 with solder 12. There were problems as described below.

(1) Attachment of the slip ring contact 7 to the rotating shaft 6 to the printed circuit board 13, that is, mechanical connection, and the printed circuit board I3 of the slip ring lead wires 10...10
Since the electrical connections are made separately, the connection workability is poor.

(2) Slip ring lead wirework 0: When soldering the IO to the printed circuit board 13, lead routing work is required, which not only reduces productivity but also tends to cause wiring errors.

(3) Slip ring lead wire lO...Fog is likely to occur due to radiation from lO.

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a connection structure for slip ring contacts that can simultaneously perform mechanical and electrical connection of slip ring contacts to a printed circuit board. It is.

[Means for Solving the Problem] A cylindrical connector to which a slip ring lead lead-out portion provided at one end of the slip ring contact is fitted is provided on the printed circuit board side, and one end of the cylindrical connector is connected to the printed circuit board. A plurality of connector terminals are provided radially, the heads of the other end protruding from the inner circumferential surface of the connector in the axial direction, and when the slip ring lead lead-out portion is fitted to the connector, the slip ring The head of the connector terminal was made to come into contact with slip ring lead terminals provided radially on the circumferential surface of the lead lead-out portion.

[Function] When the slip ring lead lead-out part is fitted to the connector,
The heads of the connector terminals provided radially on the connector contact the slip ring lead terminals provided on the circumferential surface of the slip ring lead lead-out portion, and the slip ring lead lead-out portion
The circumferential surface is pressed by the connector terminal, and the slip ring contact is attached to the rotating shaft or printed circuit board, and the slip ring is electrically connected to the printed circuit board via the slip ring lead terminal and the connector terminal. It becomes a state.

[Embodiments] Next, embodiments of the slip ring contact connection structure of the present invention will be described with reference to FIGS. 1 to 6.

In this embodiment, in a rotating drum device 2I of a VTR, when a printed circuit board 23 is mounted on the rotating drum 22, power supply current is supplied to the printed circuit board 23 and magnetic head 24, and signals are exchanged between the printed circuit board 23 and the printed circuit board 23. The connection structure of the slip ring contact 25 used for sending and receiving is shown.

As shown in FIG. 2, the slip ring contact 25 is a slip ring 26 made of a conductive material.
26 are attached to the circumferential surface of a non-conductive plastic holder rod 27 at a predetermined interval d, and a slip ring lead lead-out portion having a diameter larger than that of the holder rod 27 is provided at the lower end of the holder rod 27. 2
8 is formed. A large number of slip ring lead terminals 29 . It is electrically connected to the rings 26...26. 30 is a groove for positioning provided on the circumferential surface of the slip ring lead lead-out portion 28 in parallel with the slip ring lead terminal 29; 31 is a groove for positioning the slip ring lead lead-out portion 28;
This is a metal rotary shaft fitting part provided on the lower surface of the connector 32. When the slip ring lead lead-out part 28 is fitted to the connector 32, which will be described in detail next, the The protruding strip 33 fits into the groove 30 to prevent rotation of the slip ring lead lead-out portion 28 and perform positioning. are designed to fit together.

The connector 32 is made of non-conductive plastic and has a cylindrical shape, and is attached to the printed circuit board 23 or the rotary bearing member 35 of the rotary drum 22 so that its axis coincides with the ring center of the rotary shaft 34. As described above, the positioning protrusion 33 is formed on the inner peripheral surface of the connector 32, and when the slip ring lead lead-out portion 28 is inserted into the connector 32, the positioning groove 30 is formed with the protrusion 33. 33 is fitted into the slip ring lead lead-out portion 28
is positioned, and the tip of the rotating shaft 34 is fitted into the rotating shaft fitting portion 31.

Also, so-called pin-shaped connector terminals 35...35 are attached to the connector 32 at positions corresponding to the slip ring lead terminals 29...29 of the sleeve pull lead lead-out portion 28 inserted therein. As shown in FIG. 6, these connector terminals 35...35 have a conductive cylindrical base 37 provided with a connecting piece 36 to the printed circuit board 23 on one end side, and are fitted into the cylindrical base 37 so as to be retractable. It consists of a conductive head 38 that is fitted together, and a coil spring 39 that is attached within the cylindrical base 37 and causes the head 38 to protrude from one end side of the cylindrical base 37. . These connector terminals 35...35 are connected to the connection piece 3.
6 protrudes from the outer circumferential surface of the connector 32, and the head 38 protrudes from the inner circumferential surface of the connector 32.
It is designed to be connected with

Then, the slip ring lead lead-out portion 2 is attached to the connector 32.
8, the slip ring lead terminals 29...29 provided on the circumferential surface of the connector terminals 35...29 come into contact with the heads 38 of the connector terminals 35...35, and these heads 38 are subjected to the spring force of the coil spring 39. It is designed to resist and push down.

In the figure, 41 is a brush whose tip 41a is in contact with the slip ring 26, 42 and 43 are nuts and washers that fix the rotation bearing member 35 to the rotation shaft 34,
44 is a fixed drum, 45 is a bearing that rotatably supports the rotary shaft 34 with respect to the fixed drum 44, and 46 is a rotary transformer.

Since the connection structure of the slip ring contact of the embodiment is as described above, when the slip ring lead lead-out part 28 is pushed into the connector 32, the slip ring lead terminals 29...29 provided on the circumferential surface of the lead-out part 28 are connected. is the head 38 of the connector terminal 35...35 provided on the connector 32.
... 38, these heads 38 ... 38 are pushed down against the spring force of the coil spring 39, and the slip ring lead lead-out portion 28 is fitted into the connector 32. Therefore, the head 38 of the connector terminal 35...35
...Coil spring 39 acting on 38...39
Due to the spring reaction force, the slip ring lead lead-out portion 28 is firmly attached within the connector 32, that is, mechanically connected, and the slip ring lead lead-out portion 28 is attached to the circumferential surface of the slip ring lead lead-out portion 28. The provided slip ring lead terminals 29...29 are also electrically connected to the lead terminals of the printed circuit board 23 via the connector terminals 35...35.

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

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

(1) The slip ring contact can be attached to the printed circuit board with the simple operation of fitting the slip ring lead lead-out part into the connector, and the electrical connection between the slip ring lead terminal on the slip ring contact side and the contact terminal on the printed circuit board side can be established. Connections can be made simultaneously.

(2) There is no need to carry out the routing of slip ring lead wires, which is required when soldering conventional slip ring lead wires to lead terminals on a printed circuit board, and it is possible to eliminate wiring errors during soldering.

(3) The fogging effect due to radiation from the slip ring lead wire can be reduced.

(4) When a slip ring contact breaks down, it can be easily replaced.

[Brief explanation of drawings]

Fig. 1 is a connection structure of a slip ring contact of the present invention, Fig. 2 is a front view of the slip ring contact, Fig. 3 is a plan view thereof, Fig. 4 is a plan view of the connector, and Fig. 5 is a front view of the slip ring contact.
Figure 6 is a cross-sectional view of the connector terminal,
FIG. 7 is a sectional view showing the connection structure of a conventional slip ring contact. 21... Rotating drum device, 22... Rotating drum, 23... Printed circuit board, 24... Magnetic head, 2
5... Slip ring contact, 26... Slip ring, 27... Holder rod, 28... Slip ring lead lead-out portion, 29... Slip ring lead terminal, 32... Connector, 35...・Connector terminal. t-plane view of contact point of infBR 1st figure I/Aiu of 7° contact F 2nd figure Xf-tba of 7° contact of 7° contact Fig. 4 V-V warabi tr side view of Fig. 4 Fig. 5 Overtime 2 of Netsukotsufuta 2 Sho 5 Fig. 6

Claims (1)

[Claims] A cylindrical connector to which a slip ring lead lead-out portion provided at one end of the slip ring contact is fitted is provided on the rotating shaft side, and the cylindrical connector has one end connected to a printed circuit board and the other end connected to a printed circuit board. A plurality of connector terminals are provided radially, the heads of which protrude in the axial direction from the inner peripheral surface of the connector, and when the slip ring lead lead-out part is fitted to the connector, the connector terminals are provided radially on the peripheral surface of the slip ring lead lead-out part. A slip ring contact connection structure in which the head of the connector terminal contacts a slip ring lead terminal.