JPH0110906Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flat plate type rotary transformer used in VTRs and the like, and relates to a rotary transformer having a function of transmitting signals induced in a rotating head to a stationary amplifier.

The core used as a rotary transformer is generally a disc-shaped ferrite core that is integrally molded and then fired, with conductive wires placed in the circular grooves. Separate rotary transformer cores are being considered by combining large and small ring cores made of materials and medium-diameter rings made of nonmagnetic and conductive materials. However, when attempting to simply fix the engagement of the inner and outer circumferential surfaces of a large-diameter ring, medium-diameter ring, and small-diameter ring with adhesive, there are problems with parallelism and roundness, and the work is labor-intensive. It was hot. Moreover, even after fixing with adhesive, there was concern about the strength of the adhesive part.

The present invention eliminates the above drawbacks and provides a separate rotary transformer with good parallelism and roundness.

In order to achieve the object of the present invention, a step is provided on the inner diameter or outer diameter of the separation member and the annular ferrite core, and the step is engaged with each other to join the separation member, and the thickness of the separation member is The thickness is made thinner than the thickness of the annular ferrite core. By changing the thickness in this way, both sides or one side can be polished for parallelism correction. This is because the separating member is generally hard and not suitable for polishing at all, so if it is made thinner than the thickness of the annular ferrite core, only the annular ferrite core will be polished, and separation will be difficult. This is because there is no need to polish the member.

A detailed explanation will be given below based on examples. FIG. 1 is an exploded perspective view of an embodiment of the present invention. FIG. 2 is a sectional view of one embodiment of the present invention. The annular ferrite cores 1, 2, and 3 are provided with an annular groove, and a coil is provided in the annular groove. (The annular groove and coil are not shown in the drawing.) In this annular ferrite core, the inner annular ferrite core 1 has a step on its outer peripheral surface, and the intermediate annular ferrite core has a step on its inner and outer peripheral surfaces. A step is provided, and the outer annular ferrite core is provided with a step on its inner peripheral surface. Further, the separation members 4 and 5 have a shape that engages with a step provided on the inner peripheral surface or outer peripheral surface of the annular ferrite core, and have a cross section of T.
It is a glyph. The annular ferrite core is joined by narrowing the separation member. At this time, the thickness of the separation member is made thinner than the thickness of the annular ferrite core, so that when joined, the result will be as shown in the cross-sectional view shown in FIG. By doing so, it becomes easy to polish surface A or surface B, for example, in order to adjust parallelism. In addition, strength and roundness can also be improved by engaging with the steps mentioned above.
Improved reliability.

As described in detail above, the present invention provides a separate type rotary transformer with excellent parallelism, roundness, strength, etc. through a simple work process, and is very effective industrially.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of one embodiment of the present invention, and FIG. 2 is a sectional view of one embodiment of the present invention. 1, 2, 3...Annular ferrite core, 4, 5...
...separation member.

Claims (1)

[Scope of utility model registration request] An annular ferrite core formed for each channel or for each plurality of channels, the annular ferrite core having a concentric annular groove,
The annular groove has a coil, and the annular ferrite core is joined in a required number by narrowing the separating member, and the main planes of the separate type ferrite cores having the coils are facing each other. A separate type rotary, characterized in that the core and the separation member are joined to each other by engaging a step provided on the outer periphery or the inner periphery, and the thickness of the separation member is thinner than the thickness of the annular ferrite core. Trance.