JPH0583939U - Insulated wire - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an insulated electric wire having excellent high-frequency voltage characteristics, which is useful as a high-frequency electric wire such as a high-frequency transformer and a CRT deflection yoke coil. The present invention relates to an insulated wire in which an adhesive polymer layer 2 is provided directly on a conductor 1 and an insulating coating layer 3 is baked on the same, and the adhesive polymer layer 2 has a good adhesion property, and thus has a long service life. Long, excellent high-frequency voltage characteristics can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency insulated wire such as a high frequency transformer and a CRT deflection yoke coil, and more particularly to an insulated wire having improved high frequency voltage characteristics.

[0002]

[Prior Art]

 Recently, in CRT computer displays, monitor TVs, etc., the resolution of images has been improved. In this CRT, an insulated electric wire such as an enameled wire is used for the deflection yoke coil portion and is operated by a high frequency signal.

[0003]

[Problems to be solved by the device]

 However, the withstand voltage of the enamel wire tends to decrease with increasing frequency, so if the same enamel wire as the conventional one was used as the insulated wire for the part where the high-frequency signal is handled, There was a problem that the life of enamel wire could not be reduced due to the handling of signals.

On the other hand, there is a litz wire in which a plurality of strands are twisted together for high frequency. Although this has the effect of suppressing resistance increase and eddy current loss heat generation due to the skin effect due to high frequency, the coating film It was almost the same as the enamel wire in that the withstand voltage was decreased.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of such conventional circumstances, and is characterized in that in an insulated wire in which an insulating coating layer is baked on a conductor, an adhesive polymer layer is provided directly on the conductor. It is on an insulated wire.

[0006]

With the introduction of this adhesive polymer layer, an insulated wire having excellent high-frequency withstand voltage characteristics can be obtained without shortening the life even when used at high frequencies.

[0007]

【Example】

 The insulated wire according to the present invention is shown in FIG. 1 as follows: 1 is a conductor, 2 is an adhesive polymer layer provided directly on the conductor 1, and 3 is an adhesive polymer layer provided on the adhesive polymer layer 2. It is an insulating coating layer that has been baked.

Examples of the polymer used in the adhesive polymer layer include Admer (trade name, manufactured by Mitsui Petrochemical Industry Co., Ltd.), hiramine (trade name, manufactured by Mitsui Petrochemical Industry Co., Ltd.), polytack (trade name, Idemitsu Co., Ltd.). Examples include polyolefins having polar functional groups introduced therein, such as Petrochemical Co., Ltd., Bondyne (trade name, manufactured by Sumitomo CDF Chemical Co., Ltd.), and N polymer (trade name, manufactured by Nippon Petrochemical Co., Ltd.).

In order to apply these adhesive polymers directly on the conductor, they may be dissolved in an appropriate solvent and baked in the same manner as varnish, or extruded. If necessary, some of these adhesive polymers (for example, Admer, Himilan, N-polymer, etc. having the above trade names) can be cross-linked by irradiation with an electron beam or an ultraviolet ray after coating. .

On this adhesive polymer layer, in addition to varnish, polyurethane, polyamide, polyester, polyamide imide and the like materials similar to those of conventional enameled wire are used and coated. At this time, the combination with the above-mentioned adhesive polymer may be appropriately selected in consideration of manufacturing conditions, required characteristics and the like.

It is inferred that the formation of such an adhesive polymer layer improves the high frequency withstand voltage characteristic for the following reason. That is, the cause of the decrease in withstand voltage is not clearly specified, but one of the causes is the quality of the adhesion between the conductor and the insulating coating layer such as varnish. It is considered that the conventional ordinary enameled wire, when viewed microscopically, has insufficient adhesion, and that deterioration progresses due to discharge during use. Based on this reasoning, in order to improve the adhesiveness between the insulating coating layer and the conductor, in the present invention, when an adhesive polymer layer is interposed, good adhesiveness is obtained not only with the insulating coating layer but also with the conductor. The obtained high frequency withstand voltage characteristics were obtained.

By the way, the insulated electric wires according to the present invention (Examples 1 to 3) shown in Table 1 and the conventional ordinary insulated electric wires (Comparative Examples 1 to 3) having no adhesive polymer layer were prepared, and 90 KHz When a high frequency pulse life test was conducted on the above, the results shown in the table were obtained. As the test electric wire, a wire having a conductor diameter of 0.5 mm was prepared, and in this embodiment of the present invention, an adhesive polymer layer of 5 μm and an insulating coating layer of 20 μm were provided. It was made by providing only a 25 μm insulating coating layer.

Further, the high frequency pulse life test was carried out by applying a high frequency pulse of 90 KHz to the sample insulated wires (Examples 1 to 3 and Comparative Examples 1 to 3) while applying a voltage of 800 V to the dielectric breakdown. Was measured at room temperature.

[0014]

[Table 1]

From Table 1, in the case of the insulated wire according to the present invention (Examples 1 to 3), the life of the wire is significantly extended as compared with the conventional insulated wire (Comparative Examples 1 to 3). , It can be seen that excellent high frequency withstand voltage characteristics have been achieved.

[0016]

[Effect of the device]

 As is clear from the above description, according to the present invention, since the adhesive polymer layer is provided directly on the conductor to achieve good adhesion, the start of discharge during use is suppressed, and the high frequency transformer and CRT deflection are suppressed. As a high frequency electric wire such as a yoke coil, an insulated electric wire having a long life and excellent high frequency withstand voltage characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an insulated wire according to the present invention.

[Explanation of symbols]

 1 conductor, 2 adhesive polymer layer, 3 insulating coating layer,

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toshio Niwa 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Keiji Nakano 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Creator Kazuo Hanaoka 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An insulated electric wire obtained by baking an insulating coating layer on a conductor, wherein an adhesive polymer layer is provided directly on the conductor.