JPS63114111A - Rotary transformer - Google Patents

Abstract

PURPOSE:To reduce the number of component parts and the number of processes of a rotary transformer by using a coil formed directly on the bottom of an annular groove, and directly connecting a pin terminal used for the leads of the coil to a connecting terminal of a cylinder to a magnetic head. CONSTITUTION:An annular groove is formed on one surface of a disklike ferrite core 101, and a coil 102 is directly formed of a conductive material on the bottom of the groove, a conductive pin is inserted to the groove, and soldered to the coil end 202 of the coil 102. When associated in a cylinder, a pin terminal is projected from a rotary transformer 601. Accordingly, the pin terminal is directly soldered to a connecting terminal 604 of a cylinder 602 to a magnetic head 603. Thus, the transformer 601 can be connected to the connecting terminal 604 of the cylinder 602 to the head 603 without using a trunk member to reduce the number of processes and its cost.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary transformer used in video tape recorders and the like, which serves to transmit signals between a rotating magnetic head and a circuit in the main body. be.

(Prior Art) An example of a conventional rotary transformer is shown in FIG. In this conventional example, an annular groove is formed on one surface of a disk-shaped ferrite core 301, and a winding 302 is disposed in the annular groove. A resin molded relay terminal 303 is adhered to the back side of the surface on which the annular groove is formed of this disc-shaped ferrite core 301, and the lead wire 304 of the winding a302 is connected to one end of the resin molded relay terminal 303. Ta.

The other end 305 of the resin molded relay terminal 303 was connected to a connecting terminal portion of the rotary cylinder with the magnetic head.

Further, a separate conventional rotary transformer is shown in FIG. In this conventional example, an annular groove is formed on one surface of a disk-shaped ferrite core 401, and a winding 402 is disposed in the annular groove. A substrate 403 is bonded to the back surface of the surface of the disk-shaped ferrite core 401 on which the annular groove is formed, and a lead wire 404 of the winding 402 is connected to the substrate 403, and a relay terminal is connected to the substrate 403. 405 was connected. A sectional view of this rotary transformer assembled into a cylinder is shown in FIG. Conventionally, the relay terminal 40
3, the cylinder 501 and rotary transformer 50
I was making a connection with 3. A portion 504 of the cylinder 501 connected to the relay terminal is connected to the magnetic head 502.

(Problem to be Solved by the Invention) Conventionally, a resin molded relay terminal is attached to the tangent between the winding arranged in the rotary transformer and the terminal for connecting the magnetic head formed in the cylinder. , via relay members such as substrates and relay terminals. For this reason, the cylinder has a large number of parts as a whole, and bonding and soldering require work steps, resulting in a large number of man-hours and a high price.

An object of the present invention is to provide a rotary transformer that solves the above problems.

(Means for Solving the Problems) The present invention provides a planar facing type rotary transformer in which a coil is formed on the bottom of an annular groove using a conductive member directly by etching, sputtering, etc. as a coil disposed on the opposing surface side. A through hole is provided in the ferrite core at the end of this coil, and a conductive pin is passed through the through hole and connected to the coil portion by soldering or the like.

(Function) In the present invention, the coil is formed directly from a conductive material and a pin terminal is used as the lead.By directly connecting this pin terminal to the terminal portion for connection with the magnetic head of the cylinder, the relay member is connected. This makes it possible to reduce the number of parts for the cylinder as a whole, reducing man-hours and costs.

(Embodiment) FIG. 1 shows a sectional view of an embodiment according to the present invention. In this embodiment, an annular groove is formed on one surface of a disk-shaped ferrite core 101, and the bottom surface of this annular groove is conductive. The coil 102 is directly formed from the material. An enlarged view of the lead portion of this coil 102 is shown in FIG. 2. This coil 102 has a coil 201 and a coil end 202, and this coil end 2o2 is located at the position of a through hole 203 formed in the core. Match. A conductive pin 1 is inserted into the through hole 203 of this core.
03 is inserted, and a conductive pin 103 is soldered to the coil end 202 of the coil 102. A cross-sectional view of this embodiment assembled into a cylinder is shown in FIG.
protrudes, and this pin terminal 103 is directly soldered to a terminal portion 604 for connection to the magnetic head 603 of the cylinder 602.

According to the present invention, the rotary transformer section 601 and the magnetic head 603 of the cylinder 602 can be connected without using a relay member.
It was possible to connect the connecting terminal portion 804 with the connecting terminal portion 804, thereby achieving reductions in man-hours and costs.

Further, the conductive pin of the rotary transformer of the present invention may be made of a flexible material as required, and the tube may be covered or an insulating coating may be applied to the portion where insulation is required.

In addition, although the coil end of the rotary transformer of the present invention is formed on the annular groove in the above embodiment, it may be formed by being drawn out to a necessary position such as between the annular grooves depending on the structure of the cylinder etc. .

The pin terminal may be connected to the end of the coil at the position where the pin terminal is pulled out, and it goes without saying that a through hole is provided at the position where the pin terminal is pulled out of the disc-shaped ferrite core. This applies to the rotating side rotary transformer.

It can be similarly used for connecting a fixed side rotary transformer and a VTR circuit.

(Effect of the invention) The present invention uses a coil formed directly at the bottom of the annular groove,
This provides a rotary transformer that uses pin terminals for the leads of this coil, and allows the pin terminals to be directly connected to the connecting terminal portion of the cylinder with the magnetic head.

Therefore, the number of parts can be reduced, the number of man-hours can be reduced, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment according to the present invention, and FIG.
The figure is a partially enlarged view of the Pudding I-coil according to the present invention, FIG. 3 is a sectional view of a conventional example, and FIG.
FIG. 5 is a sectional view of a portion of a conventional cylinder, and FIG. 6 is a sectional view of a portion of a cylinder using the rotary transformer of the present invention. 101...Disc-shaped ferrite core, 102...Coil formed directly on the bottom of the annular groove, 103...Pin, 2
01... Coil part, 202... Coil end part, 203
...Through hole, 601...Rotary transformer part, 6
゜2...Cylinder, 603...Magnetic head, 60
4... Connection terminal section. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In a planar facing type rotary transformer, an annular groove is provided on the opposing surface side, a coil is formed directly at the bottom of the annular groove using a conductive material, a through hole is provided at the end portion of this coil, and a pin terminal is inserted into the through hole. A rotary transformer characterized in that the coil end portion is inserted into the rotary transformer, and the coil end portion and the pin terminal are connected.