JPS6244938A - Deflector - Google Patents

Abstract

PURPOSE:To enable regulation of magnetic field distribution in short time without requiring skill by splitting a pair of horizontal deflection coil and/or a pair of vertical coil into first coil and second coil wound over the first coil then insertion connecting a differential current transformer and regulating the magnetic field distribution. CONSTITUTION:Coils 1, 2 and 1', 2' having same winding angle are connected in parallel while a differential resistor 3 is connected between the start of winding of coils 1, 2 and the start of winding of coils 1', 2' and the intermediate point B of said resistor 3 is connected with vertical deflection circuit. When moving the intermediate point B to the connecting point side A at the start of winding of first coils 1, 2, the deflection current flowing through the first coils 1, 2 will increase to vary the magnetic field distribution into barrel field. While when moving the intermediate point B to the connecting point side C at the start of winding of second coils 1', 2', the deflection current flowing through the coils 1', 2' will increase thus to change into pin field. In such a manner, moving of the intermediate point B of differential resistor 3 will cause variation of deflection current flowing through respective coil thus to correct the field distribution.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a deflection device used for wide-angle deflection or for use in color picture tubes for high-definition displays.

<Prior art> Saddle-type deflection coils and toroidal-type deflection coils are known as deflection coils attached to color cathode ray tubes.
Variations in coil dimensions are likely to occur due to manufacturing process. In other words, for saddle-shaped coils, variations in wire diameter, slipperiness, hardness, etc.

In addition, the temperature characteristics of the winding jig used and variations in tension during coil winding are factors that cause dimensional errors in coil manufacturing. However, in toroidal coils, there are manufacturing factors such as variations in the dimensions of the ferrite core itself and variations in the dimensions of the coil caused by the width of the wire on the surface of the ferrite core when the coil is crimped.

Variations in coil dimensions due to the above-mentioned factors have also been a cause of misconvergence.

In order to suppress the occurrence of this misconvergence, it is necessary to suppress various factors that cause coil dimensional errors in the manufacturing process of each deflection coil.As a countermeasure, for example, in the case of a saddle-shaped deflection coil, as shown in Figure 2. Methods such as dividing the coil into separate windings as shown in (,), or winding a saddle-shaped coil directly on the support frame of the horizontal coil are used. or,
In deflection coils with toroidal windings, measures are taken such as cutting the ferrite core to improve the dimensional accuracy of the core. Furthermore, as a countermeasure against misconvergence after forming the coil winding, a piece of magnetic material is pasted on the horizontal deflection coil on the inner surface of the deflection yoke opening, as shown in Figure 2(b), to correct the magnetic field distribution of the deflection device. Many methods have been adopted.

<Problems to be Solved by the Invention> Although the above-mentioned deflection coil manufacturing measures are effective in reducing manufacturing errors in coil dimensions, they have drawbacks in terms of coil winding efficiency and cost. A method of correcting convergence by pasting a piece of magnetic material on a horizontal deflection coil is the so-called YPB (Yoke pull back).
k) decreases, the swing margin decreases, and there are also problems with characteristics such as unfavorable secondary misconvergence that tends to occur due to local magnetic field correction, and the work of attaching magnetic material pieces is complicated. There are some difficulties in the work.

<Means for solving the problem> Each of the pair of horizontal deflection coils and/or the pair of vertical coils is connected to a first coil and a second coil wound in a manner superimposed on the first coil. and the coil winding angle of the second coil is narrower than the coil winding angle of the first coil, and the first coils of the pair of horizontal coils and the second coils are separated from each other. and/or the first coils and the second coils of the pair of vertical deflection coils are connected in series or in d1 parallel, and the first coil unit and the second coil unit connected in series or in parallel are connected to each other in series or in d1 parallel. By inserting and connecting a differential current transformer between the coil unit and adjusting the differential current transformer, the deflection current flowing through the first coil unit and the second coil unit is varied. It is configured to adjust the magnetic field distribution.

<Operation and Examples> FIG. 1 shows an example in which the present invention is applied to a vertical deflection coil. In the figure, 1 and 1' are a first coil and a second coil, which are one of a pair of vertical deflection coils made by winding a collective wire made of at least two or more insulated wires twisted together in a toroidal shape, 2 and 2' are the other first and second coils of the vertical deflection coils. A pair of coils 1 and 2 have a winding angle of θ, and coil 1
' and 2' have a winding angle θ' and are wound in a relationship of θ>l. Here, coils 1 and 2 and coils 1' and 2', which have the same winding angle, are connected in parallel, and coils 1 and 2 are connected in parallel.
A differential resistor indicated by 3 is connected between the winding start of the coils 1' and 2', and the midpoint B of the differential resistor 6 is connected to a vertical deflection circuit (not shown). There is. By connecting in this way, the middle point B of the differential resistor 3 is connected to the first coil 1.
and 2, the deflection current flowing through the first coils 1 and 2 increases, the magnetic field distribution changes in the direction of the barrel magnetic field, and the midpoint B of the differential resistor 3 When the deflection current flowing through the coils 1' and 2' increases, the magnetic field distribution changes to a bin magnetic field. In this way, the midpoint B of the differential resistance 6
By moving the deflection current flowing through each coil, the magnetic field distribution is corrected.

Now, if the magnetic field distribution of the entire deflection yoke deviates from the designed value in the barrel direction, move the midpoint B of the differential resistor 3 toward the 0 point side and increase the deflection current flowing through the second coils 1/ and 2/. By increasing , the magnetic field distribution changes toward the pin magnetic field direction.

Also, if the magnetic field distribution deviates from the design value in the bin direction, move the midpoint B of the differential resistor 5 toward point A and increase the deflection current flowing through the first coils 1 and 2. , the magnetic field distribution changes in the barrel magnetic field direction. Therefore, it becomes possible to correct each desired magnetic field distribution.

<Effects of the Invention> According to the present invention, it is possible to correct the magnetic field without using a magnetic piece, so the magnetic field distribution can be adjusted in a short time without requiring any skill. There is no decrease in Furthermore, since local distortion correction is not performed, it has the advantage that undesirable secondary misconvergence is less likely to occur. Further, it has many advantages such as being able to use conventional coil winding equipment as is. Although the embodiment has been described with reference to a case where toroidal coils are connected in parallel, the present invention is also applicable to the case where toroidal coils are connected in series or a saddle type coil. Also, if there is no problem with pressure resistance, coil 1
' and 2' can also be taken out as tabs from the middle of the winding.

[Brief explanation of drawings]

Fig. 1 shows an embodiment in which the present invention is applied to a vertical deflection coil, the figure (,) is a connection circuit diagram of the vertical deflection coil, and the figure (b) is a connection circuit diagram of the first coil and the second coil. Explanatory diagrams of coil winding, Figure 2 shows a conventional example, Figure (a) shows a horizontal deflection coil with split winding, Figure (b) shows an example of a horizontal deflection coil with a magnetic piece pasted. shows. 1.2...First coil of vertical deflection coil 1; 2/
,... Second coil of the vertical deflection coil, θ... Winding angle of the first coil of the vertical deflection coil, θ'... Winding angle of the second coil of the vertical deflection coil, 5...・Differential resistance, 4...Horizontal deflection coil, 5...Coil separator, 6...Magnetic material piece, 7...Core. Figure 1 Figure 2 (a) (b) Procedural amendment filed on December 16, 1985 by Michibu Uga, Director General of the Patent Office, 1985 Patent Application No. 184450 2, Invention Name Deflection Device 3. Relationship with the case of the person making the amendment Patent applicant address 1-5-21 Okubo, Shinjuku-ku, Tokyo
All figures) 6. Contents of correction -□, to (1)
On page 5, lines 14-15 of the specification, the phrase ``1, which refers to a group of wires made by twisting two or more insulated wires together,'' has been amended to read ``a group of two or more insulated wires.'' (2) On page 7, line 10 of the same book, [distortion correction -1 is corrected to read ``magnetic field correction.'' (3) Amend the scope of claims and drawings (all drawings) as separate sheets. Claims 1) In a deflection device having a pair of horizontal deflection coils and a pair of vertical deflection coils, each coil of the pair of horizontal deflection coils and/or the pair of vertical coils is connected to a first coil and a first coil. and a second coil that is wound superimposed on the coil, and the coil winding angle of the second coil is narrower than the coil winding angle of the first coil. The first coils and the second coils of the horizontal deflection coils and/or the first coils and the second coils of the pair of vertical deflection coils are connected in series or in parallel to form this series arrangement. By inserting and connecting a differential current transformer between the first coil unit and the second coil unit connected in parallel, and adjusting the differential current transformer, the first coil unit A deflection device characterized in that the deflection current flowing through the unit and the second coil unit is made variable. 2) Claim 1) characterized in that the pair of horizontal deflection coils and/or the pair of vertical deflection coils are wound by collecting two or more insulated wires.
Deflection device as described in section. Figure 1 Figure 2 (a) ' (b)

Claims (1)

[Claims] 1) In a deflection device having a pair of horizontal deflection coils and a pair of vertical deflection coils, each of the pair of horizontal deflection coils and/or the pair of vertical coils is connected to the first coil and the first coil. a second coil that is wound overlappingly on the first coil, and the coil winding angle of the second coil is narrower than the coil winding angle of the first coil; The first coils and the second coils of the pair of horizontal deflection coils and/or the first coils and the second coils of the pair of vertical deflection coils are connected in series or parallel, and the series or parallel By inserting and connecting a differential current transformer between the first coil unit and the second coil unit connected to the first coil unit, and adjusting the differential current transformer, the first coil unit A deflection device characterized in that the deflection current flowing through the second coil unit is made variable. 2) The first aspect of the present invention is characterized in that the pair of horizontal deflection coils and/or the pair of vertical deflection coils are wound with a collective wire in which two or more insulated wires are twisted together. ) Deflection device described in section 2.