JPH0110910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary transformer used in VTRs and the like.

In rotary transformers, a phenomenon in which a signal from one channel mixes with a signal from another channel, that is, crosstalk, occurs due to electrostatic induction or electromagnetic induction. This crosstalk has caused problems in VTRs, such as adversely affecting images. In order to improve this crosstalk characteristic, it is generally known to provide a short ring between each channel. However, even in this short ring,
The industry is demanding a rotary transformer with even better characteristics than one with completely improved crosstalk characteristics. Also, in order to improve crosstalk characteristics, there is a method of separating each channel, but this method causes deformation of the ferrite core manufactured for each channel, etc.
There were problems with roundness, parallelism, etc., which are very important for a rotary transformer, and there were problems with making it a separate type.

The object of the present invention is to provide a rotary transformer with good crosstalk characteristics that meets the above requirements.

In order to achieve the above object, the present invention integrates a ferrite core, provides an annular groove in the middle between the channel grooves, provides a through hole in a part of the groove, and has a protrusion that engages with the through hole. A core is attached to a core holding ring made of a nonmagnetic conductor having a core holding ring, and a ring member made of a nonmagnetic conductor is further inserted into the annular groove of the core, and the ring member and the core holding ring are electrically connected. be. This integrated structure has better dimensional characteristics such as roundness than separate types, and the non-magnetic conductor core holding ring and ring member allow short coils to be inserted between the channels. It is possible to prevent crosstalk.

This will be explained in detail below with reference to the drawings. Fig. 1 is a plan view of a ferrite core according to an embodiment of the present invention (hereinafter referred to as the first embodiment), Fig. 2 is a bottom view of the first embodiment, and Fig. 3 is a plan view of a ferrite core according to the first embodiment. Example A-A
FIG. 4 is a sectional view taken along line B-B of the first embodiment. In this first embodiment 1, channel grooves 2 and 3 and an annular groove 4 are provided between the channel grooves on the main plane. A plurality of through holes 5 are provided in a part of the annular groove. Further, FIG. 5 shows a plan view of an embodiment of the core holding ring according to the present invention,
FIG. 6 is a sectional view taken along line CC in FIG. Further, an embodiment of the ring member according to the present invention is shown in FIG.
FIG. 8 is a sectional view of the ring member of FIG. 7. This core holding ring body 6 is provided with a protrusion 7 that engages with the through hole 5, and a protrusion 9 that engages with the inner peripheral surface 8 of the first embodiment and an outer periphery of the first embodiment. A projection 11 is provided which engages the surface 10.
The first embodiment 1 is inserted into the core holding ring 6, and the ring member 12 is further inserted into the annular groove 4 to electrically connect the core holding ring 6 and the ring member 12.

Moreover, FIG. 9 shows a plan view of a ferrite core according to another embodiment of the present invention (hereinafter referred to as the second embodiment), and FIG. 10 is a bottom view of the second embodiment, and FIG.
Figure 1 is an A'-A' sectional view of the second embodiment.
FIG. 2 is a sectional view taken along line B'-B' of the second embodiment. The second embodiment 13 is provided with a channel groove, an annular groove 16, and a through hole 17, almost similarly to the first embodiment. In the second embodiment, a recess 15 is provided for mounting the core holding ring 14. FIG. 13 is a plan view of another embodiment of the core holding ring according to the present invention, and FIG. 14 is a sectional view taken along line C'-C' in FIG. This core holding ring 14 is provided with a protrusion 18 that engages with the through hole of the second embodiment, and fits into a recess 15 provided on the lower surface of the second embodiment. The core holding ring 14 is inserted into the second embodiment by engaging the through hole 17 and the protrusion 18, and the ring member 12 is further inserted into the annular groove 16 of the second embodiment, and the core holding ring 14 is inserted into the second embodiment. and the ring member 12 are electrically connected.

With the structure described in detail above, the ferrite core is produced as a single piece, so it has excellent dimensional characteristics such as roundness and has very little deformation. In addition, the core holding ring and ring member made of a non-magnetic conductor make it possible to surround the magnetic material between the channels with a conductive material, so that the magnetic flux in the direction of canceling out the magnetic flux that is generated between the channels is transferred to the conductive material. This can prevent crosstalk generated by the body.

Further, even when the number of channels increases, it is easy to use the structure of the present invention between each channel, and the present invention is not limited to a two-channel rotary transformer.

Furthermore, the same effect can be obtained by using a conductive resin, a conductive adhesive, or the like in place of the core holding ring or ring member in the present invention.

As detailed above, the rotary transformer according to the present invention can use a one-piece ferrite core that is less deformed during production, and can extremely reduce the occurrence of crosstalk, making it very effective industrially. It is.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a ferrite core according to an embodiment of the present invention, FIG. 2 is a bottom view of the ferrite core of FIG. 1, and FIG. 3 is an A-A of the ferrite core of FIG. 1. 4 is a BB sectional view of the ferrite core of FIG. 1, FIG. 5 is a plan view of a core holding ring according to an embodiment of the present invention, and FIG. 6 is a sectional view of the ferrite core of FIG. 5 is a cross-sectional view of the core holding ring body shown in FIG. 5, FIG. 7 is a plan view of a ring member according to an embodiment of the present invention, and FIG. 8 is a sectional view of the ring member shown in FIG. 7. FIG. 9 is a plan view of another embodiment of the ferrite core according to the present invention, and FIG.
Figure 0 is a bottom view of the ferrite core in Figure 9,
FIG. 11 is a sectional view taken along A'-A' of the ferrite core shown in FIG. 9, FIG. 12 is a sectional view taken along B'-B' of the ferrite core shown in FIG. FIG. 14 is a plan view of a core holding ring according to another embodiment, and FIG. 14 is a C'-C' sectional view of the core holding ring shown in FIG. 13. 1, 13... Ferrite core, 2, 3... Channel groove, 4, 16... Annular groove, 5, 17... Through hole, 6, 14... Core holding ring body, 7, 9, 1
1, 18... protrusion, 12... ring member.

Claims (1)

[Claims for Utility Model Registration] 1. A ferrite core formed on a disc has a plurality of channel grooves on one surface, a coil is provided in the channel groove, and the one surface faces each other. In the rotary transformer, a concentric annular groove is provided between the channel grooves on the one surface, a plurality of through holes are provided in a part of the annular groove, and a protrusion that engages with the through hole is provided. A core holding ring made of a nonmagnetic conductor is inserted by engaging the through hole and the protrusion, a ring member made of a nonmagnetic conductor is further inserted into the annular groove, and the core holding ring and the ring member are electrically connected. A rotary transformer that is characterized by being joined together. 2. In claim 1 of the utility model registration claim, the core holding ring is smaller than the ferrite core, and the surface of the ferrite core on which the core holding ring is attached,
A rotary transformer characterized by having a recess for a core holding ring. 3. A rotary transformer according to claims 1 and 2 of the utility model registration, characterized in that a conductive resin or a conductive adhesive is used instead of the core holding ring or ring member.