JPH0739216Y2 - Rotary transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer mounted as a signal transmission component of a rotary head cylinder such as a video tape recorder or a digital audio tape.

[0002]

2. Description of the Related Art In recent years, magnetic recording / reproducing devices such as video tape recorders have been highly competitive in price reduction, and along with this, cost reduction of a rotary transformer, which is a main component thereof, has become an important issue. .

A conventional rotary transformer will be described below. FIG. 3 is a sectional view showing the structure of a conventional rotary transformer. In FIG. 3, reference numeral 1 is a flat plate-shaped first magnetic body, and a coil 3 is wound around a circumferential groove 5 thereof. Two
Is a flat plate-shaped second magnetic body, and a circumferential groove 6 is formed on a surface facing the first magnetic body 1 with a predetermined gap 9, and the coil 4 is wound in the circumferential groove 6. Has been done. As for the coil 3 and the coil 4, as shown in FIG. 4, the coil is preliminarily wound in a ring shape, and a lead wire is drawn out through the through holes 7 and 8 formed in the circumferential grooves 5 and 6 to perform wire treatment. It is mass-produced by this method.

[0004]

However, in the above-mentioned conventional configuration, it is difficult to automatically mechanically wind the coil 3 and the coil 4 on the magnetic bodies 1 and 2, and the wire processing requires a large number of man-hours. However, the number of man-hours could not be reduced, and there was a limit to cost reduction.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a rotary transformer in which automatic mechanical winding is easy and the wire processing does not require man-hours and the cost can be significantly reduced.

[0006]

In order to solve this problem, the rotary transformer of the present invention has an automatic mechanical winding and a bobbin which is easy to be wire-processed, is preliminarily wound, and is then subjected to wire treatment. It is configured to be housed and coupled in the circumferential groove of.

[0007]

With the above construction, a complicated winding method or wire treatment method is not required, and mass production can be performed using the same equipment as a general coil product, so that a significant cost reduction can be realized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a rotary transformer according to an embodiment of the present invention.

In FIG. 1, 10 is a flat plate-shaped first magnetic body, 11 is a flat plate-shaped second magnetic body, which has a predetermined gap 22 and has circumferential grooves at opposite positions on the respective facing surfaces. 1
4 and 15 are formed, and winding bobbins 16 and 17, which have been wound in advance, are housed and coupled in the circumferential grooves 14 and 15, respectively. In addition, the wire processing unit 2 of the winding coils 12 and 13
0 and 21 are through holes 18 and 1 provided in the circumferential grooves 14 and 15, respectively.
It is pulled out from the opposite side to the opposite side through 9.

The operation of the rotary transformer configured as described above will be described below.

This embodiment shows an embodiment in the case of two signal transmission systems, and the winding bobbins 16 and 17 housed in the circumferential grooves 14 and 15 are, as shown in FIG.
A winding start portion 23 and a winding end portion 2 extending in the axial direction 6 and 17
Since 4 is provided so that line processing can be performed separately, a signal transmission operation can be performed from this portion. Also,
By using a material having a low conductivity as the material of the winding bobbins 16 and 17, it is possible to perform signal transmission similarly to a conventional rotary transformer without interfering with the magnetic fields of the winding coils 12 and 13. The winding on the winding bobbins 16 and 17 can be performed by a general automatic mechanical winding machine.
3. It is easy to carry out soldering on the end-of-winding part 24 by using a color.

As described above, according to the present embodiment, after the winding bobbins 16 and 17 are used for winding and wire treatment, the winding bobbins 16 and 17 are housed and coupled to the circumferential grooves 14 and 15. By using such a configuration, it is possible to obtain a rotary transformer capable of significantly reducing the cost.

In this embodiment, the embodiment in which the number of signal transmission systems is two is shown, but there may be any number of the signal transmission systems, and the short ring is formed between the signal transmission systems. May be.

Further, in this embodiment, all the circumferential grooves 1
Although the configuration of the present invention has been used for Nos. 4 and 15, the configuration of the present invention may be partially used.

Further, in this embodiment, the winding bobbins 16,
Although the winding coils 12 and 13 are directly carved on the winding start portion 23 and the winding end portion 24 of 17, the winding start portion 23 and the winding end portion 24 have pin terminals embedded in the winding bobbins 16 and 17, respectively. It may be configured. This winding bobbin 16,1
As the material of 7, a liquid crystal polymer having high soldering heat resistance is used, which is most practical because it does not cause thermal deformation, and resin ferrite may be used to improve magnetic characteristics.

[0017]

As described above, according to the present invention, the winding bobbin which has been subjected to the winding treatment and the wire treatment is housed and coupled in the circumferential groove formed in the flat plate-shaped magnetic body is used. It is possible to realize an excellent rotary transformer that can be machine-winded easily and does not require man-hours for wire treatment and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a rotary transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the shape of a winding bobbin used in a rotary transformer according to an embodiment of the present invention.

FIG. 3 is a sectional view showing the configuration of a conventional rotary transformer.

FIG. 4 is a perspective view of a winding coil used in a conventional rotary transformer.

[Explanation of symbols]

 10 Flat First Magnetic Material 11 Flat Second Magnetic Material 12 Winding Coil 13 Winding Coil 14 Circumferential Groove 15 Circumferential Groove 16 Winding Bobbin 17 Winding Bobbin 18 Through Hole 19 Through Hole 20 Wire Processing part 21 Wire processing part 22 Void 23 Beginning of winding 24 End of winding

Claims (3)

[Scope of utility model registration request] 1. A flat plate-shaped first magnetic body having a circumferential groove for accommodating a winding, and a second magnetic body having a circumferential groove formed on a surface facing the magnetic body with a predetermined gap. A winding bobbin having a winding is housed in at least one circumferential groove of at least one of the two magnetic bodies, and the winding bobbin is wound through a through hole provided in the circumferential groove. A rotary transformer constructed by taking out the wire treatment part of the bobbin from the opposite side. 2. The rotary transformer according to claim 1, wherein the wound wire bobbin is made of a high temperature solder heat resistant liquid crystal polymer. 3. The rotary transformer according to claim 1, wherein the wound bobbin is made of resin ferrite.