JPS6236263Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotary transformer, particularly a multi-channel rotary transformer, and more specifically, by depositing a conductive thin film on the rotary transformer core surface, crosstalk between channels is reduced. This is what we are trying to reduce.

Figure 1 is a longitudinal cross-sectional view of this type of rotary transformer, where 1 is a rotary core, 2 is a stator core,
3 is the ch ₁ rotor side coil, 4 is the ch ₂ rotor side coil, 5 is the ch ₁ stator side coil, 6 is the ch ₂ stator side coil, 7 is the hole provided to pull out the coil, 8 is the hole provided to pull out the coil. A conductive thin film shield formed in an annular shape, 9 a support plate for fixing the stator core,
10 is a rotation shaft for rotating the rotor core.

This type of rotary transformer reduces crosstalk between channels by annularly depositing a conductive thin film shield 8 on both or one of the rotary core surface and the stator core surface. In the structure in which an annular thin film shield 8 is provided on the plane of this polished core,
Because the gap between both cores must be set to a small value of several tens of micrometers or less, the thin film shield is often damaged by mistake during assembly and adjustment, and the thickness of this thin film shield is about 1 micrometer. Because it is extremely thin, the thin film shield, which was formed in a continuous ring shape, may become locally thin, or in extreme cases, the ring may become discontinuous, significantly weakening the effect of reducing crosstalk between channels. Put it away.

This idea was made with the aim of solving the above-mentioned drawbacks of the conventional one, and it created a concave depression between each channel on the core plane, and formed an annular conductive thin film shield in this part. .

Figure 2 is a vertical sectional view of one embodiment of this invention;
The figure is a plan view of the rotary core seen from the line in Figure 2, and Figure 4 is a sectional view of the rotary core seen from the line in Figure 3. It is a shallow concave depression, and numeral 12 is a conductive thin film shield formed in a ring shape to a thickness of about 1 μm by a method such as vapor deposition on the surface of this depression.

The width 1 of this depression 11 is the distance m between the coils 3 and 4.
The width is approximately the same as or narrower than this.
Furthermore, the width n of the thin film shield 12 is the width 1 of the recess 11.
formed into a narrower width. This is thin film shield 1
This is equivalent to forming the recess 11 so that its thickness g is shallower than the depth h of the recess 11. Also core 1, 2
are fixed to the rotating shaft 10 and the support plate 9 so as to face each other with a narrow gap of several tens of micrometers in between, as shown in FIG.

The rotary transformer configured in this way is
The rotary The transformer can be easily assembled and adjusted.

Conventionally, a method for reducing crosstalk between channels was to create an annular groove with a width of about 1 mm and a depth of about 1 mm between the channels, and to attach a shot ring to this groove.
The value of depth is an obstacle in reducing the size of the rotary transformer, and the depth of 1 mm causes many problems in terms of strength and in forming a thin film on the groove surface. This idea can also solve this type of problem.

In the above embodiment, a rotary transformer was used as an example in which the ch ₁ and ch ₂ coils are taken out from separate holes, but the present invention is not limited to this example.
As shown in Figures 5 and 6, grooves 13 are cut in the core surface to take out the ch ₁ and ch ₂ coils from the same location.
In the rotary transformer formed with the above, the same effect can be obtained by filling the insulating material 14 in the groove and providing a concave depression similar to that in the above embodiment, thereby forming an annular thin film shield. It is.

Note that the annular conductive thin film may be formed by a sputtering method, a plating method, or the like in addition to the vapor deposition method. Further, in the above embodiment, an example was shown in which the thin film shield was formed on both the rotor side and the stator side, but the thin film shield is not limited to this example, and may be formed only on either one. Further, the present invention is not limited to a two-channel case as in this example, but can be similarly applied to a multi-channel case.

Note that a thickness of about 1 μm is sufficient for the thin film shield, but it goes without saying that the thicker the shield, the more effective it is.

Furthermore, it goes without saying that what has been described above can be similarly applied to a coaxial rotary transformer.

This idea consists of a rotary core fixed to a rotating shaft, a plurality of rotary coils coaxially arranged on one surface of this core, and supported so as to face the coil arrangement surface of the rotary coils with a gap in between. a stator core, a plurality of stator coils disposed on opposing surfaces of the core so as to face the plurality of rotary coils, and a core surface between these stator coils or a core surface between the rotary coils. It is equipped with a concave recess formed in an annular shape on both or one of the surfaces, and a conductive thin film shield continuously adhered to the recess. Compared to those that apply a conductive thin film, assembly,
There is no risk of damaging the thin film during adjustment, and assembly and
Adjustment is easy, and it is possible to reduce costs and improve reliability.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a conventional rotary transformer, Fig. 2 is a longitudinal sectional view of an embodiment of this invention, Fig. 3 is a plan view of the rotary core seen from the line of Fig. 2, and Fig. 4 is a longitudinal sectional view of a conventional rotary transformer. 3 is a sectional view taken along the line in FIG. 3, FIG. 5 is a plan view of a rotary core according to another embodiment, and FIG. 6 is a sectional view taken along the line in FIG. In the figure, 1 is a rotary core, 2 is a stator core, 5 and 6 are stator side coils, and 12 is a thin film shield.

Claims (1)

[Scope of utility model registration request] A rotary core fixed to a rotating shaft, a plurality of rotary coils coaxially arranged on one surface of the core, and a stator core supported so as to face the coil arrangement surface of the rotary coil with a gap therebetween. , a plurality of stator coils arranged to face the plurality of rotary coils on the opposing surface of the core, and a core surface between these stator coils and/or a core surface between the rotary coils. A rotary transformer comprising a concave recess formed in an annular shape on one side thereof and a conductive thin film shield continuously adhered to the recess.