JPH06163276A - Rotary transformer - Google Patents

Abstract

PURPOSE:To improve workability and assembling properties of a rotary transformer to be used in a VTR, especially when the transformer is constituted outside a cylinder. CONSTITUTION:This rotary transformer is constituted as follows; a rotary side core 14 and a fixed side core 17 are fixed to retaining members 15, the respective retaining members are interlinked with each other by using a bearing 20, and, in consequence, the rotary side core and the fixed side core are unified in a body so as to be able to concentrically rotate while keeping a specified air gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device in a magnetic recording / reproducing apparatus such as a video tape recorder (VTR), and more particularly to an improvement of a rotary transformer provided in the rotary magnetic head device.

[0002]

2. Description of the Related Art FIG. 3 is a partial sectional view showing the structure of a conventional face-to-face type rotary transformer in a VTR. In FIG. 3, reference numeral 1 is a rotary cylinder, which is equipped with a magnetic head (not shown). Reference numeral 2 is a fixed cylinder, and a shaft 4 integrated with a disk 3 for fixing the rotary cylinder 1 is supported by a bearing (not shown) at its center. Reference numeral 5 denotes a rotating core of a rotary transformer, which is adhered to a base 6, and the base 6 is fixed to the disk 3 by a screw 7.
A fixed core 8 of the rotary transformer is bonded to the fixed member 9. The fixing member 9 is fixed to the supporting member 10 with screws 11 at a predetermined position. The support member 10 is fixed to a wiring processing case 12 extending from the fixed cylinder 2. A motor portion 13 is directly connected to the shaft 4 and drives the rotary cylinder 1.

[0003]

The structure of the rotary transformer as described above has a structure in which the rotary transformer inside the cylinder is used particularly when interference called crosstalk is desired to be avoided for performance reasons or when space is insufficient. However, the air gap between the rotating and stationary cores should generally be as small as 50 to 75 microns, and the concentricity of the rotating and stationary cores should be accurate. You need to set it up, you need a fixture for it,
A great deal of labor will be required during assembly or maintenance. Furthermore, the supporting member of the fixed core largely protrudes from the outer circumference of the cylinder, which is an obstacle to space saving and downsizing.

The present invention is intended to solve such a problem, and to provide a rotary transformer which does not require any jig for mounting and can be easily constructed in a short time and in a relatively narrow space. With the goal.

[0005]

To achieve the above object, in a rotary transformer of the present invention, a rotating core and a stationary core are fixed to support members, and the support members are connected by bearings. As a result, the rotating side
The stationary core has a predetermined gap and is concentrically rotatable relative to each other.

[0006]

In the structure of the rotating and fixed cores of the rotary transformer as described above, the support member and the bearing preliminarily set the gap between the rotating and fixed cores and the position in the height direction to support the cores at the same time. Since this is an integrated structure, no special jig is required after this configuration is done, and handling such as fixing and removing is extremely easy.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view showing the structure of a rotary transformer according to an embodiment of the present invention. The same parts as those in FIG. 3 showing the conventional example are designated by the same reference numerals and will not be described in particular.

In FIG. 1, reference numeral 14 denotes a rotating core, the outer peripheral portion of which is adhered and fixed to a supporting member 15 as shown in the figure. 16
Is a wiring terminal of a coil (not shown) installed in the rotating core 14. Reference numeral 17 denotes a fixed core, the inner peripheral portion of which is adhesively fixed to the support member 18. Reference numeral 19 denotes a wiring terminal of a coil (not shown) installed on the fixed core 17. Two
Reference numeral 0 denotes a ball bearing, which concentrically connects and supports the support member 15 and the support member 18. At this time, a jig is used to preliminarily attach the supporting member to the rotating side core 14 and the stationary side core 17 so that a predetermined space is concentrically maintained and a predetermined positional relationship is maintained in the axial direction. It suffices to consider the accuracy when bonding. Reference numeral 21 is a member for applying a preload to the ball bearing 20, and is fixed to the support member 15 with a screw 22 by applying a predetermined load.
By doing so, the rotary core 14 and the fixed core 17 are integrated to form an independent rotary transformer configuration.

Next, the process of fixing the rotary transformer to the cylinder body will be described. Similarly, in FIG. 1, the support member 15 to which the rotary core 14 is fixed can be accurately positioned by fitting the centering hole provided in the bottom portion of the support member 15 with the shaft 4, and the screw 23 can be used for disc positioning. By fixing to 3, it is possible to perform stable rotation in which shake is suppressed.

FIG. 2 is a sectional view showing an integrated structure of a rotary transformer according to another embodiment of the present invention. Reference numeral 24 is a rotating core, which is fixed to a supporting member 25 by adhesion. Two
Reference numeral 6 denotes a wiring terminal of a coil (not shown) installed on the rotating core 24. 27 is a fixed core, which is a support member 28
It is glued and fixed to. Reference numeral 29 is a wiring terminal of a coil (not shown) installed in the fixed core 27. Reference numeral 30 denotes a ball bearing, which concentrically connects and supports the support member 25 and the support member 28. Reference numeral 31 is a member for preloading the ball bearing 30, and the screw 3
It is fixed to the support member 25 by 2. That is, in the embodiment of FIG. 1, the outer side is the rotating portion, and in the embodiment of FIG. 2, the inner side is the rotating portion. The rotary transformer of FIG. 2 can also be fixed to the cylinder body as in the example of FIG. Here, the type of bearing is a ball bearing, but other bearings can be used, and a configuration in which the support member itself is part of the bearing is also conceivable, in which case downsizing can be achieved. Further, in the present embodiment, the cylindrical type peripherally opposed rotary transformer is shown, but the same structure can be applied to the plane opposed type.

With such a structure, that is, by integrating the rotary transformer as shown in FIGS. 1 and 2, the handling property and the assembling property to the cylinder body are improved, and the advantages of reliability and cost are brought about. A method using a relay printed circuit board may be considered for the wiring from the rotary transformer, and a method such as soldering or a connector may be considered for connection. Further, in the rotation preventing mechanism for the fixed core and its supporting member in the present embodiment, the wiring material connected to the outside from the fixed core is used as it is, or a member such as a sheet metal is extended from the cylinder main body to form a fixed supporting member. It can be easily constructed by bringing them into contact.

[0013]

As described above, according to the present invention, the rotary side and the fixed side of the rotary transformer are integrated by using the bearing, so that a dedicated jig is not required and the rotary transformer is easily and quickly fixed. It becomes possible to provide a rotary transformer that can.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing the structure of a rotary transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view of a rotary transformer configuration showing another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a conventional example of a rotary transformer configuration.

[Explanation of symbols]

 14 Rotating-side core 15 Supporting member 17 Fixed-side core 18 Supporting member 20 Ball bearing 24 Rotating-side core 25 Supporting member 27 Fixed-side core 28 Supporting member 30 Ball-bearing

Claims (1)

[Claims] 1. A first support member, a rotating core fixed to the first support member, a second support member, and a second support member.
A rotary transformer having a fixed core fixed to the support member and a bearing for concentrically connecting and supporting the first and second support members.