JPH0530331Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> This invention relates to rotating transformer parts applied to rotating head devices of VTRs, etc., and in particular, the invention relates to rotating transformer parts applied to rotating head devices of VTRs, etc. It relates to a wiring structure for connecting to a circuit.

<Prior Art> As is well known, in a coaxial rotary transformer, a plurality of winding grooves are formed on the outer circumferential surface of two small-diameter cylindrical cores (one is a stator core, the other is a rotor core), and a plurality of winding grooves are formed on the outer circumferential surface of the small-diameter one of two cylindrical cores (one is a stator core, the other is a rotor core). A plurality of annular winding grooves are also formed on the inner peripheral surface of the core, and transformer windings are wired in each of the winding grooves. Both cores are coaxially arranged to form a double cylinder, and a small gap is maintained between the transformer winding wired around the outer circumference of the inner core and the transformer winding wire wired around the inner circumference of the outer core. The transformer windings face each other, and signals are transmitted between the opposed transformer windings. In the case of a VTR rotating head device,
The transformer winding on the stator core side is drawn out and connected to a recording/reproducing circuit, and the transformer winding on the rotor core side is connected to a magnetic head attached to the rotor.

In conventional rotating transformer parts, a plastic or metal terminal block (base) is fixed to one end of the cylindrical core, and the lead wires at the end of the transformer winding wired around the core are connected to the core. The lead wires were led to the terminal block through a wiring groove formed on the surface, and the lead wires were soldered to terminal pins planted on the terminal block. This terminal pin was configured to be connected to another printed wiring board or the like.

<<Problems to be Solved by the Invention>> The conventional wiring structure for rotating transformer components described above has a large number of parts and a complicated structure, resulting in poor assembly efficiency and high costs.
In addition, the lead wire at the end of the transformer winding is routed from the winding groove to the terminal block, but the lead wire in this part tends to lift off the core surface, and the lead wire may float up during the operation of the rotating transformer. There were cases in which the wire rose and came into contact with the opposing core, causing failures such as wire breakage or insulation coating peeling off, resulting in a shot.

This idea was devised in view of the conventional problems mentioned above, and its purpose was to create a simple wiring structure with a small number of parts, improve the assembly and wiring workability of this type of rotating transformer parts, and also The purpose is to prevent contact failure with the opposing core due to the lead wire lifting up.

《Means for solving the problem》 Therefore, this invention is a wiring structure for a rotating transformer component in which transformer windings are wired in each of a plurality of winding grooves formed annularly on the outer peripheral surface of a cylindrical core. An annular groove parallel to the winding groove and an axial vertical groove perpendicular to the annular groove are formed on the outer circumferential surface of the core, and the lead wire at the end of the transformer winding is passed through the longitudinal groove to the core. Pull it out to one end side, press the outside of the lead wire with a lifting prevention wire wrapped around the annular groove, join a flexible wiring board to one end surface of the core, and solder the lead wire to this wiring board. and the annular groove is formed between the winding groove closest to the flexible wiring board and the flexible wiring board.

<<Operation>> Since the lead wire wired in the annular groove is pressed from the outside by the lifting prevention wire, the lead wire does not loosen and float to the outside of the core. Further, since the transformer winding is directly connected to the flexible wiring board via the lead wire, the wiring therebetween is very simple and highly reliable.

<<Embodiment>> FIGS. 1 and 2 show the configuration of an embodiment of the present invention. In the figure, reference numeral 1 denotes a cylindrical core that becomes the stator core, and four annular winding grooves 2 are formed in parallel at regular intervals on the outer circumferential surface of the core, and each winding groove 2 is provided with a transformer winding. Line 3 is wired.

Further, an annular groove 4 is formed on the outer circumferential surface of the cylindrical core 1 so as to be located further above the uppermost one of the four winding grooves 2. Further, a plurality of vertical grooves 5 are formed on the outer peripheral surface of the cylindrical core 1 and extend in the axial direction perpendicular to the annular groove 4 . Further, a flexible wiring board 6 is bonded to the upper end surface of the cylindrical core 1 with an adhesive.

The lead wire 3a at the end of each transformer winding 3 is wired through the vertical groove 5 to the flexible wiring board 6 side at the upper end, and the end of each lead wire 3a is soldered to a predetermined land portion 6a of the flexible wiring board 6. has been done. Here, since the land portion 6a of the flexible wiring board 6 is located somewhat outside the outer diameter of the cylindrical core 1, the lead wire 3a soldered there is separated from the outer circumferential surface of the core 1 and is placed on the land portion 6a. It will be wired to the side.

In order to prevent the lead wire 3a wired to the land portion 6a side from lifting up as described above, a wire material 7 made of a thin wire or the like is wound around the annular groove 4 at the top of the cylindrical core 1. The lead wire 3a is pressed down from the outside. This prevents the lead wire 3a from rising from the outer surface of the core 1 in the portion below the wire rod 7.
Note that an annular groove 4 for winding the lifting prevention wire 7 may also be provided between each winding groove 2.

<<Effects of the invention>> As explained in detail above, in the wiring structure of a rotating transformer component according to this invention, a flexible wiring board is bonded to one end surface of a cylindrical core, and a transformer wire is wired in the winding groove of the core. The lead wire at the end of the winding is routed through the vertical groove and soldered directly to the land of the flexible wiring board, making the wiring structure extremely simple and requiring fewer parts.
External connections also become very easy and reliable. In addition, the lead wire wired through the vertical groove is pressed down from the outside by a lifting prevention wire wrapped around the annular groove of the core, so the lead wire in this area loosens and floats outward from the core surface. Therefore, contact failure with the opposing core due to lifting of the lead wire is almost completely eliminated.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a rotary transformer component employing a wiring structure according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same component. 1... Cylindrical core, 2... Winding groove, 3... Transformer winding, 3a... Lead wire, 4... Annular groove, 5
...Vertical groove, 6...Flexible wiring board, 6a...
Land portion, 7...Wire rod.

Claims (1)

[Scope of utility model registration request] A wiring structure of a rotating transformer component in which transformer windings are respectively wired in a plurality of winding grooves formed annularly on the outer circumferential surface of a cylindrical core, the wires being arranged parallel to the winding grooves on the outer circumferential surface of the core. An annular groove and an axial longitudinal groove perpendicular to the annular groove are formed, and the lead wire at the end of the transformer winding is drawn out to one end of the core through the longitudinal groove, and a float is wound around the annular groove. The outer side of the lead wire is held down by a cable for preventing climbing, and a flexible wiring board is joined to one end surface of the core, and the lead wire is soldered to this wiring board, and the winding groove closest to the flexible wiring board is A wiring structure for a rotating transformer component, characterized in that the annular groove is formed between the flexible wiring board and the flexible wiring board.