JPH0217465Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention transmits signals sensed by rotation sensors in various control devices and detection devices, rotation heads of video tape recorders, etc. to stationary circuit parts, or Conversely, the present invention relates to a rotary transformer that is widely used as a means for transmitting control or recording signals to rotating parts.

(Prior Art) A plan view of a conventional relay board mounting surface is shown in FIG. Conventionally, a lead wire 3 of a coil wound around a core 1 is guided to a relay board 5 bonded to the back side of the coil mounting surface of the core 1 through a notch 6 on the outer periphery of the core 1, and a land portion of the relay board 5 is guided. It was connected to 4.

(Problem to be solved by the invention) Conventionally, the notch 6 provided on the outer periphery of the core 1
On the other hand, the notch 8 provided on the outer periphery of the relay board 5 was set large. Therefore, the lead wire 3 of the coil comes into contact with the corner of the notch 6 of the core 1,
Problems such as the winding coating peeling off or being cut occurred. This is because the ferrite core is
This is because the notch 6 has a hard edge because surface accuracy and dimensional accuracy are achieved by polishing.

In view of the above, an object of the present invention is to provide a rotary transformer that safely guides lead wires to a relay board.

(Means for Solving the Problem) In order to achieve the above object, the present invention makes the notch on the outer periphery of the relay board smaller than the notch on the outer periphery of the core, and the lead wire is cut into the notch on the relay board. This is to prevent the part from touching the notch of the core.

At this time, the dimensional tolerances of the core and the relay board are taken into consideration, and the above relationship is satisfied even if variations occur within the dimensional tolerances.

(Function) As in the present invention, by making the notch on the outer periphery of the relay board smaller than the notch on the outer periphery of the core, when the relay board is bonded to the core, the notch on the outer periphery of the core Since the relay board protrudes beyond the notch and the coil lead wires contact the corners of the relay board without contacting the corners of the core, problems such as peeling or cutting of the insulation coating can be prevented.

(Embodiment) FIG. 1 is a plan view of a mounting surface of a relay board according to an embodiment of the present invention. In this embodiment, when the relay board 2 is bonded to the core 1, the notch 7 of the relay board 2 is attached so that the notch 7 on the outer periphery of the relay board 2 protrudes from the notch 6 on the outer periphery of the core 1. It is located as a small notch. By this, the coil lead wire 3 can be connected to the relay board 2 without touching the corners of the core.
It is connected to the land portion 4 of.

Generally, the dimensional tolerance of the core is larger than that of the relay board, so the cutout portion of the relay board is set in consideration of the dimensional tolerance of the core.

In this invention, the outer diameter of the ferrite core is
To account for ±0.3mm variation, the dimensions of the relay board were set as shown below. FIG. 3 shows a dimensional drawing of the back surface of the ferrite core, and FIG. 4 shows a dimensional drawing of the relay board. When the ferrite core notch in Fig. 3 reaches its maximum value of 37 mm, it becomes 37.3 mm. For this reason, the dimensions of the relay board notch shown in FIG. 4 were set to 37.6±0.1, so that even if the relay board was minimized, it would not be smaller than the core notch. Regarding the width of the notch, as shown in FIG. 3, the width of the ferrite core notch is 1.19 mm at its minimum. Therefore, in the relay board, 1.8±0.1
mm, so that even when the relay board reaches its maximum size, it will not be larger than the ferrite core notch. Furthermore, an error in bonding the relay board to the core may be taken into account.

Furthermore, it goes without saying that even if the core has a notch on its inner periphery, the same effect can be obtained by using the same structure.

(Effects of the invention) According to the invention, the problem of the lead wire of the coil coming into contact with the corner of the notch on the outer periphery of the core, causing the insulation coating of the lead wire to peel off or be cut, can be solved. This makes it possible to safely connect the coil lead wire to the relay board, which is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a board mounting surface of an embodiment of the present invention, FIG. 2 is a plan view of a conventional board mounting surface, and FIG. 3 is a plan view of a board mounting surface of an embodiment of the present invention. FIG. 4 is a back view of the core of the example, and FIG. 4 is a relay board of one embodiment according to the present invention. 1...Core, 2...Relay board according to the present invention, 3
. . . Lead wire, 4 . Notch on the outer periphery of the relay board.

Claims (1)

[Scope of utility model registration request] A relay board is attached to the back side of the coil arrangement surface of the core, and the lead wire of the coil is passed through a notch provided on the outer periphery of the core and a notch provided on the outer periphery of the relay board to the relay board. In a rotary transformer to be guided and connected, taking into consideration the dimensional tolerances of the core and relay board, even if dimensional variations occur within the dimensional tolerance, the notch provided in the relay board is smaller than the notch provided on the outer periphery of the core. 1. A rotary transformer characterized in that the rotary transformer is configured such that the lead wires do not touch the corners of the notch of the core at the notch of the relay board.