JPH02887Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a videotape recorder (hereinafter referred to as
This relates to rotary transformers used in VTRs, etc.

The rotary transformer used in a VTR plays the role of transmitting electrical signals from a stationary VTR circuit to a rotating magnetic head, and also transmitting signals read from a magnetic tape by the magnetic head to a stationary VTR circuit. There is. When used in this VTR, it has become clear that crosstalk between each winding channel affects various characteristics such as image quality of the VTR. In order to improve this crosstalk between each winding channel, a method is generally used in which a shot ring is installed between each winding channel. FIG. 1 shows a cross-sectional view of an example of a coaxial rotary transformer. A rotor 1 having a winding groove on the outer peripheral surface of a cylindrical ferrite core, a shot ring groove between the grooves, and a winding and a shot ring attached to the groove, and a cylindrical ferrite opposing the rotor. The inner circumferential surface of the core has a winding groove and a shot ring groove that are opposite to the rotor groove, and the stator 2, which has the winding and shot ring attached to the groove, faces each other with a slight gap. are doing.

Conventionally, when attaching a shot ring to a coaxial type rotary transformer, a method has been used in which a wire is glued to the shot ring attaching groove and the terminal end is soldered. This will be explained using a diagram.

Core 1 with a groove on the outer periphery of the ferrite core
Wrap the wire 5 around the shot ring groove shown in figure a, and
At this point, the wire is glued to the shot ring groove as shown in Figure b. The ends of this wire are fixed in a conductive state by soldering or the like, and the short ring 4 is assembled as shown in FIG. 2C.

In addition, in the core 2 which has a groove on the inner circumference of the ferrite core, a shot ring is attached in the same way as the core 1 which has a groove on the outer circumference. As shown in FIG. 3b, it was bent so that it became smaller than the inner circumference of the ferrite core, and as shown in FIG. 3c, it was restored in the shot ring groove and a shot ring 6 was attached.

However, attaching the shot ring requires soldering of wire rods, etc., and attaching the shot ring to a ferrite core having a groove on the inner periphery is difficult, requires a lot of man-hours, and is difficult to automate.

The present invention aims to improve the above-mentioned drawbacks and provide a rotary transformer that has high performance and reduces man-hours.

In order to achieve the above object, the present invention is characterized in that the shot ring material used in the coaxial rotary transformer is made of a material that restores its shape by heat, electromagnetic radiation, or the like.

Hereinafter, a detailed explanation will be given based on examples.

Figure 3a shows a short ring whose shape has been restored by heat or electromagnetic radiation. FIG. 3b shows the shot ring before being irradiated with heat or electromagnetic radiation. The dimensions of the shot ring in FIG. 3a were made to match the grooves in the stator 2 in FIG. 1. To assemble the shot ring, first insert the shot ring in the state shown in FIG. 3b into the shot ring groove of the stator in FIG. A part of the shot ring shown in FIG. 3b is irradiated with heat or electromagnetic radiation while being fixed in the shot ring attaching groove. As described above, the shot ring material restores its shape by irradiating it with heat or electromagnetic radiation, and becomes the state shown in FIG. 3a within the core, and the shot ring fits into the shot ring attaching groove.

Since the shape shown in FIG. 3b can be any arbitrary shape to obtain a certain shape, automation can be easily performed by creating a jig that matches this shape.

As described above, the present invention makes it easier to insert the shot ring in a coaxial rotary transformer, reducing the number of man-hours.Furthermore, compared to the conventional method, the shot ring does not need to be connected by soldering, so the soldered part does not change over time. It is possible to eliminate problems caused by this, and improve reliability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a coaxial rotary transformer, Fig. 2 a, b, and c are perspective views when installing a shot ring on the rotor, and Fig. 3 a, b, and c are perspective views of the stator. It is a perspective view when installing a shot ring. 1...Rotary core, 2...Stator core, 3...Winding, 4.6...Shot ring.

Claims (1)

[Scope of utility model registration request] A coaxial rotary transformer characterized in that the short ring used between each winding is made of a material that restores its shape by heat or electromagnetic radiation.