JPH0110911Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary transformer used in a video tape recorder and the like, and particularly to a separate type rotary transformer.

This rotary transformer has a function of transmitting a signal induced in a rotating head to a stationary amplifier, and is required to have high performance in various electrical characteristics. Separate rotary transformers are being considered in order to improve the crosstalk characteristics among the electrical characteristics.

However, rotary transformers require extremely high dimensional accuracy such as roundness and parallelism.
Difficulties have arisen when manufacturing separate rotary transformers. On the other hand, the patent application 1987-
101646, a step is provided on the inner periphery of a large-diameter ferrite core to engage with a step provided on the outer periphery of a medium-diameter separation member, and a step is provided on the inner periphery of a medium-diameter separation member. A separate type rotary transformer is being considered, which is provided and engaged with a step provided on the outer circumference of a small-diameter ferrite core. A sectional view of this conventional example is shown in FIG. In this separate type rotary transformer, by providing a step, the surface of the ferrite core can be easily exposed, the adhesive strength between the ferrite core 1 and the separating member 2 is improved, and the workability is also very good. However, there are problems in that the cost is high when the separation member 2 is manufactured integrally, and the weight becomes heavy when the separation member is manufactured from copper, which is the most suitable material for the separation member.

In view of the above, an object of the present invention is to provide a separate type rotary transformer that is inexpensive to manufacture and lightweight.

In order to achieve the above object, the present invention separates the stepped portion of the separation member and forms a simple assembly of ring-shaped separation members.

This will be explained in detail below with reference to the drawings. A sectional view of one embodiment of the present invention is shown in FIG. Further, a plan view of this embodiment is shown in FIG. A step is provided on the inner peripheral surface of the large-diameter ferrite core 3, and a winding groove 4 is provided on the main plane. Further, a step is provided on the outer peripheral surface of the small diameter ferrite core 5, and a winding groove 4 is provided on the main plane. A separation member is provided between the large diameter ferrite core 3 and the small diameter ferrite core 5. This separation member has a ring-shaped separation member 6 made of copper at its center, and a ring-shaped separation member 7 having a low height in the axial direction is bonded to the outer and middle peripheries of the ring-shaped separation member 6. This low-height ring-shaped separating member 7 creates a step in the separating member, which is brought into engagement with the steps in the inner and outer diameters of the large and small diameter ferrite cores 3 and 5.

With such a structure, each of the separation members has a simple ring shape, which makes it easy to manufacture and reduces the manufacturing cost. In addition, by using separation members with different axial heights, it is possible to easily create a step in the entire separation member, which facilitates positioning when adhering to the ferrite core, and improves adhesive strength. can. In addition, it is best to use a separation member made of copper, but by making only the central separation member with a high axial height made of copper and the separation member with a low axial height made of resin or plastic, the entire separation member can be made of copper. It can be made lighter than when it is made of copper.
Of course, this does not impair the improvement in crosstalk characteristics provided by the copper separation member.

As detailed above, the separate rotary transformer according to the present invention can reduce manufacturing costs,
It has good workability, improved adhesive strength, and good crosstalk characteristics, making it extremely useful industrially.

[Brief explanation of the drawing]

1 is a sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment according to the present invention, and FIG. 3 is a plan view of the embodiment of FIG. 2. 1, 3, 5... Ferrite core, 2... Separation member, 4... Winding groove, 6... Copper separation member, 7
...Separation member made of resin.

Claims (1)

[Claims for Utility Model Registration] 1. A rotary transformer comprising a disc-shaped ferrite core having a plurality of concentric grooves on its main plane, the main planes of a disc-shaped ferrite core having wires wound in the grooves facing each other. In a separate type rotary transformer in which the disk-shaped ferrite core is composed of a plurality of ferrite cores, a ring-shaped separation member has a height in the axial direction on the outer periphery or inner periphery of the ring-shaped separation member. A separate type rotary transformer characterized by using a separation member formed by bonding a low ring-shaped separation member. 2. Claim 1 of the utility model registration claim is characterized in that the ring-shaped separating member with a high axial height is a non-magnetic conductor, and the ring-shaped separating member with a low axial height is made of resin or plastic. Separate type rotary transformer.