JPS5945168B2 - Manufacturing method of sub-deflection coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sub-deflection coil of a deflection device that is attached to a color picture tube and applies an electromagnetic deflection effect to three electron beams.

Generally, an electromagnetic deflection device for a color picture tube consists of a ferrite annular core wound with a pair of horizontal deflection coils and a pair of vertical deflection coils, with the horizontal deflection coil being saddle-wound and the vertical deflection coil being wound around a ferrite-based annular core. It can be roughly divided into a single toroidal type with toroidal winding, and a double toroidal type with toroidal winding of both the horizontal and vertical deflection coils.

The distribution width in the tube axis direction of the magnetic field generated by the toroidally wound deflection coil is larger than the tube axis distribution width of the magnetic field generated by the saddle wound deflection coil. The side edges may enter the main electron lens and cause aberrations,
Alternatively, it is easy to cause a situation where the electron gun electrode is busy and generates eddy current in the electrode, and if this happens, it is impossible to obtain a color reproduced image with good image quality.

Therefore, a sub-deflection coil is provided adjacent to the electron gun side end of the toroidal deflection coil, and the electron gun side end of the main deflection magnetic field generated by the toroidal deflection coil is replaced by the auxiliary deflection magnetic field generated by the sub-deflection coil. It is being done to offset the

Details of this deflection device can be found, for example, in Japanese Patent Application No. 52-1261.
It is described in the specification of No. 05, etc., and its outline is as follows.

Specifically, in FIG. 1, an insulated conducting wire 2 toroidally wound around a ferrite annular core 1 forms a pair of toroidal horizontal deflection coils 3, and the electron gun of this horizontal deflection coil 3 is The first and second horseshoe-shaped sub-deflection coils 4.5 provided adjacent to the side ends face each other across the horizontal deflection plane.

Now, if the first and second sub-deflection coils 4.5 are connected in series to a pair of horizontal deflection coils 3, and a sawtooth wave current for horizontal deflection is passed through them (the direction of flow is indicated by an arrow).
In addition to the main deflection magnetic field A shown by the solid line arrow in FIG.

C occurs.

The strength of the auxiliary deflection magnetic field B generated by each inner circular arc portion 4.5 of the first and second auxiliary deflection coils 4.5 is compared to the strength of the auxiliary deflection magnetic field C generated by the outer circular arc portion 4.5. Since it is inversely proportional to the square of the arc radius,
The main deflection magnetic field A on the electron gun side of the horizontal deflection coil 3 is
This is canceled out by the electron gun side portion of the auxiliary deflection magnetic field B due to the inner circular arc portion 4.5.

In addition, the low optical surface side portion of the auxiliary deflection magnetic field B is the main deflection magnetic field A.
This strengthens the fluorescent surface side portion of the sub-deflection coil 4.
5 prevents the main deflection magnetic field produced by the toroidal horizontal deflection coil from scattering on the electron gun side.

The present invention provides a novel method for manufacturing a sub-deflection coil that exhibits the above-mentioned functions, and will be described below with reference to embodiments shown in the drawings.

In FIG. 3, a first columnar split mold 6 having a crescent-shaped cross section is removably bundled with a second columnar split mold 7 having a protrusion that enters the recess, and these are separated from each other by a columnar mold 7 having an elliptical cross section. A core 8 is formed.

Two semicircular presser plates 9.10 and two semicircular presser plates 11.12 provided so as to surround the outer peripheral surface of the winding core 8 are connected to the first and second columnar press plates 9.10 and 11.12. split mold 6
.

The conducting wire 13 is made of a so-called enamelled steel wire, and has a molten material layer made of thermoplastic resin or the like on its surface.

Therefore, when the conductive wire 13 wound in the state shown in FIG. 3 is heated by passing a current of an appropriate magnitude for a certain period of time, the molten material layer melts and the coils are solidified into one piece.

The winding core 8 rotates about the central axis when the conducting wire 13 is wound.

Of course, the winding core 8 may be fixed and the supply conductor side may be wound around the winding core 8, but since a coil body solidified into an annular shape is obtained by the above-mentioned electrical heating, the holding plate 9 is then fixed.
．． 1G, 11° and 12, and pull out the second columnar split mold 1.

Next, as shown in FIG. 4, the coiled conductive wire 13 is pressed down from both sides by the holding plates 14, 15° 16.17 which hold the first columnar split mold 6 in a guillotine shape, and the coiled conductive wire 13 is reattached to the conductive wire 13. Turn on electricity.

While this energization is being carried out, the press mold 18 is moved in the direction of the arrow, and a part of the coiled conductive wire 13 is
Push it into the recess 6 of the columnar mold 6.

That is, the coil portion that becomes the inner arcuate portion of the sub-deflection coil is formed by molding using the recessed portion 6 of the first columnar split mold 6 and the arcuate tip portion of the press mold 18, and this molding step After cooling, the coiled body is removed from the mold.

As described above, the method for manufacturing a sub-deflection coil of the present invention includes the first
and a coil forming step of winding an insulated conductive wire around the outer peripheral surface of an elliptical columnar winding core formed by bundling a second columnar split mold, and heating the conductive wire with electricity to form a fusing material layer on the surface of the conductive wire. A lashing process that temporarily melts and solidifies the coils together,
a molding step of removing the second columnar split mold while leaving the first columnar split mold, and pushing a portion of the conductive wire into a recessed part of the first columnar split mold while energizing the conductive wire again. Not only can the first columnar split mold used as the winding core when winding the conductive wire forming the sub-deflection coil also be used as the mold for forming the outer arc-shaped part of the coil, but also the inner circular It can be used directly as a mold for forming arcuate parts, eliminating the trouble of changing molds and deformation when changing molds, and it is possible to easily convert the sub-deflection coil, which has a relatively complex shape like a horseshoe, using a simple device. Efficient production is possible due to easy operation and busy work.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a deflection device equipped with a sub-deflection coil;
The figure is a side sectional view to explain the magnetic field produced by the deflection device.
3 and 4 are perspective views schematically showing a coil forming step and a molding step according to the sub-deflection coil manufacturing method of the present invention. 4.5... Sub-deflection coil, 6... First
Columnar split mold, 6 ... Recessed part of the same split mold, 1
...Second columnar split mold, 8... Winding core,
13...Conducting wire, 1B...Press mold.

Claims (1)

[Claims] 1. A step of forming a coil for winding a conductive wire, the outer circumferential surface of an elliptical columnar winding core formed by bundling first and second columnar split molds with an insulating coating, and heating the conductive wire with electricity to heat the surface of the conductive wire. A lashing step of temporarily melting the fusion material layer and solidifying the coils together; removing the second columnar split mold leaving the first columnar split mold; and re-energizing the conductive wire. A method for manufacturing a sub-deflection coil, comprising a molding step of pushing two portions of a conducting wire into a recess of the first columnar split mold.