JPH0726827Y2 - Rotating transformer terminal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a rotary transformer applied to a rotary head device of a VTR or the like, and more particularly to a terminal structure for external connection of a transformer winding on a rotor core side.

<< Prior Art >> In a typical rotary transformer, a donut disk-shaped rotor core and a stator core are coaxially arranged with a minute interval, and concentric circles are formed on the respective facing surfaces of the rotor core and the stator core (this is the front surface). Signals are transmitted between the transformer windings that are wired in the. In the case of a rotary head device of a VTR, the winding on the stator core side is wired on the fixed cylinder side, and the winding on the rotor core side is connected to the magnetic head in the rotating cylinder.

In the conventional rotary transformer, the terminal structure on the rotor core side is as follows. The transformer windings are laid in such a manner that they are embedded in concentric grooves on the front side of the rotor core. A relay board made of a printed wiring board is previously bonded to the back side of the rotor core opposite to this surface. Then, both ends of the transformer winding wire laid on the front side are extended to the back side and soldered and connected to a predetermined portion of the relay board.

In addition, a terminal block made by implanting a plurality of lead pins on a plastic base is prepared as a separate component. When this terminal block is positioned and applied to the back surface side of the rotor core to which the relay board is bonded, the tongue piece at the base of the lead pin abuts the bonding land provided on the relay board. Therefore, the terminal block is correctly positioned and bonded to the rotor core, and the tongue piece of the lead pin is soldered to the bonding land portion of the relay board.

By the structure and process as described above, the lead pin is projected to the back side of the rotor core, and the assembly component in which the lead pin and the transformer winding are connected via the relay board is completed.

As described above, in the conventional terminal structure, the relay substrate and the terminal block are added to the rotor core to perform the terminal treatment of the transformer winding, and the structure is complicated due to the large number of parts and the assembling process of these components is performed. However, it was very complicated and complicated. Therefore, it is difficult to reduce the cost of the product, and there is a problem in terms of downsizing.

On the other hand, a method disclosed in Japanese Patent Laid-Open No. 59-127813 is known as a method in which the number of parts is reduced and the assembling process is simplified. In this known method, a through hole is provided at the end of the winding groove of the rotary core, and a conductor such as a copper wire whose coating has been stripped off in advance is laid in the winding groove, and then a conductor as a terminal is provided in the through hole. The pins are inserted and bent, and the conductor paste is poured into the winding grooves and dried to connect the conductor pins to the windings.

<Problems to be solved by the invention> However, in this known method, when the conductor pin is inserted into the through hole, the conductor pin is difficult to be inserted because the winding is present at that portion, and There is a problem that the winding is damaged when it is inserted. Although this known method can be applied to a rotary transformer having a winding groove for one turn, four terminals are required for a rotary transformer having a winding groove for two turns concentrically. Since the position of the conductor pin that serves as the terminal is regulated by the gap between the grooves, inconvenience occurs when assembling on a board or the like.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a rotary transformer in which two large and small concentric grooves are formed on a surface of a rotor core, and a transformer winding is provided in each groove, An object of the present invention is to provide a terminal structure in which lead pins of a rotor core can be easily and surely mounted while maintaining a predetermined distance, and an external lead-out process of a transformer winding can be put together with an extremely simple structure.

<< Means for Solving the Problems >> Therefore, according to the present invention, a rotary transformer in which two large and small concentric grooves are formed on the front side of the rotor core facing the stator core, and a transformer winding is wired in each groove. In the above, a notch recess is formed at the outer peripheral ends of the rotor core that are diametrically opposed to each other, and a convex portion that partially protrudes in the radial direction is formed at the center of the inner surface of the notch recess to form a portion on both sides of the recess. Square holes are formed, the bases of the lead pins projecting to the back side of the rotor core are positioned in each of the partial square holes, and fixed with an adhesive that covers the partial square holes and the convex parts. Is drawn from the outer periphery of the rotor core to the back side and wound around the lead pins and soldered.

<< Operation >> The lead pins are directly fixed to the rotor core with an adhesive and are positioned and attached to the partial square holes on both sides of the recess, so that the pitch between the adjacent lead pins is guaranteed to be a predetermined dimension. Further, the winding is easily pulled out from the outer periphery of the rotor core to the back side, and its end is firmly connected to this lead pin.

<< Embodiment >> FIGS. 1 to 4 show a terminal structure of a rotor core in a rotary transformer according to an embodiment of the present invention. A ferrite rotor core 1 is formed in a thin donut disk shape having a large hole 2 in the center. As shown in FIG. 2, two large and small concentric grooves 3, 3 are formed on the front side (the surface facing the stator core) of the rotor core 1, and the transformer winding 4 is embedded in each groove 3. The wires are laid out in such a way that On the front side of the rotor core 1, a lead-out wiring groove 5 is formed on the same diameter line, and the wiring groove 5 extends from the inner circular groove 3 to the rotor core 1
Has reached the outer peripheral edge. The lead wire 8 of the transformer winding 4 is drawn out to the outer peripheral side of the rotor core 1 through the wiring groove 5.

The rotor core 1 at the position where the lead-out wiring groove 5 is formed
Notched recesses 6 for attaching the lead pins 7 are formed in the outer peripheral portion (at two locations). As shown in detail in FIG. 4, the lead pin 7 is a thin square rod having a square cross section, and a protrusion that partially protrudes in the radial direction is formed at the center of the inner surface of the pin-retaining notched recess 6 at one location. Is formed so that the two lead pins 7 can be held in parallel with a certain distance.
Two partial square holes are formed. The base portion of the lead pin 7 is fitted into this square hole portion, and the adhesive 9 is applied and fixed so as to cover the convex portions from both square hole portions and straddle the convex portion. A thermosetting resin is used as the adhesive 9.

The lead wires 8 at both ends of the transformer winding 4 are drawn from the circular groove 3 to the outer peripheral side of the rotor core through the wiring groove 5, and are further drawn to the back side and wound around the root portion of the lead pin 7 several times. Then, that portion is soldered to surely connect.

With the above configuration and process, the rotor core 1 is provided with 4
The lead pin of the book is projected, and the assembly in which the lead wires 8 at both ends of the transformer winding 4 laid on the front side of the rotor core 1 are connected to the lead pin 7 is completed.

<Effect of Device> As described in detail above, in the terminal structure of the rotary transformer according to the present invention, the lead pin is directly fixed to the rotor core with the adhesive, and the lead wire of the transformer winding is directly connected to the lead pin. This structure does not require any components such as the intermediate board and terminal block (plastic base with lead pins planted) in the conventional structure, which not only significantly reduces the component cost, but also reduces the assembly process. It's extremely simple and easy, greatly improving productivity.

Further, since the lead pins are positioned and attached to the partial square holes on both sides of the cutout recess, the pitch between the adjacent lead pins is guaranteed to be a predetermined dimension. Also, the convex parts that partition the partial square holes on both sides of the cutout recess are inside the cutout recess and covered with this adhesive when the lead pins are bonded, so if this part breaks or cracks during assembly, You don't have to worry about it.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotor core side assembly component according to an embodiment, FIGS. 2 and 3 are front and rear views of the same assembly component, and FIG. 4 is an enlarged view of a main part of the same component. 1 …… Rotor core 3 …… Circular groove 4 …… Transformer winding 5 …… Drawer wiring groove 6 …… Notch recess for pin holding 7 …… Lead pin 8 …… Lead wire on both ends of transformer winding 4 9 …… Adhesion Agent

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masakazu Ito 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Creator Atsushi Fujii 5-36-11 Shinbashi, Minato-ku, Tokyo Within Fuji Electric Chemical Co., Ltd. (56) Reference JP 59-127813 (JP, A) JP 42-4266 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A rotary transformer in which two large and small concentric grooves are formed on the front side of a rotor core facing a stator core, and transformer windings are laid in each groove. Forming a notched concave portion on the outer peripheral end portion, and forming a partial square hole on both sides of the concave portion by forming a convex portion that partially protrudes in the radial direction at the central portion of the back surface of the notched concave portion, The base portion of the lead pin projecting to the back side of the rotor core is positioned in each of the partial square holes and fixed by an adhesive covering the partial square hole and the convex portion, and the lead wires at both ends of each transformer winding are A terminal structure of a rotary transformer, which is drawn out from the outer periphery of a rotor core to the back side and wound around the lead pin and soldered.