JPH06188051A - Power feeding device for vtr rotating drum - Google Patents

Abstract

PURPOSE:To miniaturize a device and lower cost, by fixing two slip rings in the axis direction of a rotation shaft in a mutually insulated condition, and performing power feeding to an electronic part via the rotation shaft by a slip ring on a separated side from the rotation shaft. CONSTITUTION:A spacer 12, formed in a collar-attached hollow cylindrical state by insulating material, is press-in fixed to a rotation shaft 7 composed of conductive material. Slip rings 8a and 8b are fixed to the outer periphery of the spacer 12 in a mutually insulated condition by noble metal alloy. Conductive collars 15a and 16a are press-in fixed to the rotation shaft 7, and conductive wires 14a and 14b are connected to the outer peripheral end edge parts of the spring 8a and the collar 15a respectively. Consequently, the connecting part of the conductive wires 14a and 14b is formed into an opened space, the work of solder connection, etc., is facilitated, and also the rotation shaft 7, the spacer 12, and the slip rings 8a and 8b are contacted in diameters to lower cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power feeding device used for feeding power to an electronic component, for example, a preamplifier, which is built in a rotary drum which constitutes a video tape recorder (hereinafter referred to as VTR). A VTR that is especially small and improved to be manufactured at low cost.
The present invention relates to a power supply device for a rotating drum.

[0002]

2. Description of the Related Art FIG. 3 is a front view of essential parts showing the vicinity of a VTR rotary drum equipped with a power supply device which is the object of the present invention. In FIG. 3, reference numeral 1 denotes a fixed drum, which is formed in a short cylindrical shape and fixed to the chassis 2. Reference numeral 3 denotes a rotary drum, which is formed in a short columnar shape similar to that of the fixed drum 1, is provided with, for example, two magnetic heads 4 in the vicinity of the outer periphery, is provided coaxially with the fixed drum 1, and can be rotated by a drive motor 5. Has been formed.

Next, 6 is a power feeding device, which is coaxially provided on the upper end surface of the rotary drum 3 and is in sliding contact with the rotary shaft 7, the slip ring 8 fixed to the rotary shaft 7, and the cylindrical outer peripheral surface of the slip ring 8. The power supply brush 9 and the cover 10 that are provided as described above are included. Reference numeral 11 denotes a bracket, which is provided on the chassis 2 and supports the power feeding device 6.

With the above structure, the rotary drum 3 is rotated by the drive motor 5 at, for example, 1800 rpm, and a magnetic tape (not shown) is run horizontally on the cylindrical surface of the rotary drum 3 so that the magnetic head 4 is passed through. It is possible to scan the magnetic tape diagonally and record and reproduce image information. In this case, a rotary transformer (not shown) may be provided on the opposing surfaces of the rotary drum 3 and the fixed drum 1 to exchange signals with the magnetic head. In recent years, by incorporating a preamplifier in the rotary drum 3, it is possible to send and receive a signal having a good S / N ratio and to reduce the number of phases of the rotary transformer. The power supply device 6 shown in FIG. 3 is a device for supplying power to the preamplifier from an external power supply.

[0005]

The power supply device 6 having the above-mentioned configuration.
The slip ring 8 has a structure in which a noble metal alloy such as a gold alloy or a platinum group alloy is provided on the outer periphery of a spacer 12 formed into a hollow cylindrical shape with a collar made of an insulating material, as shown in an enlarged sectional view of an essential part of FIG. In general, it is formed into a hollow cylindrical shape and fixed. The lead wire 14 is connected to the projecting piece 13 provided integrally with the slip ring 8 so as to face the inside of the spacer 12, and the rotary drum 3 shown in FIG.
For example, the power is supplied to a preamplifier provided inside.

In the structure shown in FIG. 4, since the connection between the projecting piece 13 and the conductor wire 14 is extremely complicated, a lot of man-hours and time are required for the connection work, and the manufacturing cost rises. There is a problem.

Further, since the conductor wire 14 is arranged inside the spacer 12, the inner diameter of the spacer 12 must be made large corresponding to the diameter of the conductor wire 14 and the number of arranged conductor wires 14.
When a large number of slip rings 8 are provided, the inner diameter of the spacer 12 becomes larger. Therefore, the outer diameter of the slip ring 8 fixed to the outer periphery of the spacer 12 is inevitably large, the material cost of the slip ring 8 made of a noble metal alloy is high, and the manufacturing cost of the entire power feeding device is increased. There is.

The present invention solves the problems existing in the above-mentioned prior art, is small in size and can reduce the manufacturing cost.
An object is to provide a power supply device for an R rotary drum.

[0009]

In order to achieve the above object, in the first aspect of the invention, an end surface portion of a rotary drum, which is provided with a magnetic head in the vicinity of the outer periphery and is rotatably formed coaxially with a fixed drum, is first provided. VTR coaxially installed on the rotary drum and configured to supply power to electronic components contained in the rotary drum
In a power supply device for a rotating drum, two slip rings formed of a conductive material are fixed to each other in an insulating state in an axial direction of a rotating shaft, and power is supplied to the electronic component from a slip ring on a side away from the rotating drum. The technical means of adopting the above-mentioned configuration is adopted.

In the second aspect of the invention, a magnetic head is provided in the vicinity of the outer periphery and is coaxially provided on the end surface of a rotary drum which is formed so as to be rotatable coaxially with the fixed drum, and is incorporated in the rotary drum. In a power supply device for a VTR rotary drum configured to supply power to electronic components, n (n is a positive integer of 3 or more) slip rings are insulated from each other in the axial direction of a rotating shaft formed of a conductive material. In addition to being fixed, the rotating shafts are provided with (n-2) layer conductive parts formed in an insulating state, respectively, and the (n-1) slip rings on the side remote from the rotating drum supply power to the electronic component. The technical means of adopting a structure in which the operation is performed via the conductive portion and the rotating shaft that form the rotating shaft is adopted.

[0011]

With the above structure, the rotating shaft to which the slip ring is fixed can be formed with a small outer diameter because it is not necessary to penetrate the conducting wire, and as a result, the outer diameter of the slip ring is also small. It is possible to reduce the required amount of expensive precious metal alloy.

[0012]

1 is an enlarged sectional view of an essential part showing an embodiment of the present invention, in which the same parts are designated by the same reference numerals as those in FIGS. In FIG. 1, the rotating shaft 7 is formed of a conductive material, and a spacer 12 formed of an insulating material in the shape of a hollow cylinder with a flange is press-fitted and fixed to the rotating shaft 7.
The slip rings 8a and 8b are formed of, for example, a noble metal alloy into a hollow cylindrical shape with a collar, and are fixed to the outer periphery of the spacer 12 in an insulating state.

Next, 15a is a conductive collar, which is made of a conductive material, for example, in the shape of a hollow disk, and is press-fitted and fixed to the rotary shaft 7 in contact with the lower end surface of the spacer 12. On the other hand, the conductive collar 16a is made of a conductive material, for example, in the shape of a hollow bowl, and the rotating shaft 7 is in contact with the outer circumference of the slip ring 8b.
Is press-fitted and fixed. The lower side in FIG. 1 is the rotary drum 3 side in FIG. The conductive wires 14a and 14b are connected to the outer peripheral edge of the slip ring 8a and the outer peripheral edge of the conductive collar 15a, respectively.

With the above structure, one of the current paths is the slip ring 8a on the side closer to the rotating drum → the conducting wire 14a, and the other of the current paths is the slip ring 8b on the side away from the rotating drum → the conductive collar 16a → the rotating shaft 7. → Conductive collar 15a → Conductive wire 14b. The conductors 14a, 14b
Are connected to, for example, a preamplifier provided in the rotary drum 3 shown in FIG.

Due to the above structure, the conductor 14
Since the connection portions of a and 14b both become open spaces, the work by solder connection, for example, can be performed very easily. On the other hand, since it is not necessary to dispose the conductors 14a and 14b in the spacer 12 as shown in FIG. 4, the rotating shaft 7 shown in FIG. You can As a result, the outer diameter dimensions of the spacer 12 and the slip rings 8a, 8b are also greatly reduced, and in particular, the required amount of the noble metal alloy forming the slip rings 8a, 8b can be reduced.

FIG. 2 is an explanatory view of essential parts showing another embodiment of the present invention, and the same parts are designated by the same reference numerals as those in FIG. In FIG. 2, the rotating shaft 7 is integrally provided with conductive portions 17a to 17c formed in an insulating state. Then, five slip rings 8a to 8e are fixed to the rotating shaft 7 in an insulated state. The conductive collars 16a to 16d are respectively fixed to the rotary shaft 7 so as to be in contact with the outer circumferences of the slip rings 8b to 8e and to be in direct contact with the corresponding conductive portions 17a to 17c and the rotary shaft 7, respectively. On the other hand, the conductive collars 15a to 15d have conductive parts 17a to 17c, respectively.
Also, they are respectively fixed to the rotary shaft 7 so as to directly contact the rotary shaft. By connecting the conductors 14a to 14e to the slip ring 8a and the conductive collars 15a to 15d, respectively, the corresponding slip rings 8a to 8e can be connected.

Generally, when fixing n (n is a positive integer of 3 or more) slip rings, the rotating shaft 7 is provided with (n-2) layer conductive parts formed in an insulating state, respectively, and these are formed. Providing (n-1) conductive collars above and below the conductive part,
Power may be supplied from the (n-1) slip rings on the side away from the rotating drum via the conductive portion of the (n-2) layer and the rotating shaft.

In this embodiment, an example in which the slip ring is integrally formed of a precious metal alloy has been described. However, a foil of a precious metal alloy is fixed to the surface of the body of a copper alloy, or by means such as vapor deposition or electrodeposition. A means for forming a thin film on the surface of the main body may be used, and in short, a noble metal alloy may be applied to the minimum necessary area that is in sliding contact with the power supply brush. Therefore, for example, a noble metal alloy foil may be placed on the surface of a low-priced copper strip, and a clad-processed composite material may be formed and then pressed.

[0019]

EFFECTS OF THE INVENTION Since the present invention has the structure and operation as described above, the following effects can be obtained. (1) The diameter of the rotating shaft and the slip ring forming the power supply device can be reduced, and the required amount of expensive precious metal alloy can be significantly reduced. As a result, the device can be downsized and the manufacturing cost can be reduced. (2) Since all the connecting portions with the conductors are open spaces, the connecting work is extremely easy and the productivity is improved.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part showing another embodiment of the present invention.

FIG. 3 is a front view of a main part showing the vicinity of a VTR rotary drum provided with a power supply device which is an object of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main portion showing a slip ring that constitutes the power feeding device in FIG.

[Explanation of symbols]

 3 rotating drum 7 rotating shaft 8, 8a-8e slip ring

Claims (2)

[Claims] 1. A rotary drum (3) having a magnetic head (4) in the vicinity of the outer periphery thereof and coaxially provided on an end face portion of a rotary drum (3) formed so as to be rotatable coaxially with the fixed drum (1). ) In a power feeding device for a VTR rotary drum configured to feed power to electronic components built in, the two slip rings (8a) and (8b) are mutually connected in the axial direction of the rotary shaft (7) formed of a conductive material. And a power supply to the electronic component from the slip ring (8b) remote from the rotary drum (3) via the rotary shaft (7). Power supply device for VTR rotating drum. 2. A rotary drum (3) having a magnetic head (4) in the vicinity of its outer periphery and coaxially provided on the end surface of a rotary drum (3) which is coaxially rotatable with the fixed drum (1). ), A power feeding device for a VTR rotating drum configured to feed power to electronic components built in the device, the n-number (n is a positive integer of 3 or more) in the axial direction of the rotating shaft (7) formed of a conductive material. Slip ring (8a) ~
(8e) are fixed to each other in an insulating state, and conductive parts (17a) to (17c) of (n-2) layers, which are formed in an insulating state, are provided on the rotating shaft (7), respectively, from the rotating drum (3). (N-1) slip rings (8b) on the distant side ~
The VTR is configured so that power is supplied from (8e) to the electronic component via the conductive portions (17a) to (17c) and the rotating shaft (7) that form the rotating shaft (7). Power supply device for rotating drum.