JPS5841639Y2 - Deflection yoke for color cathode ray tube - Google Patents

Description

[Detailed description of the invention] The present invention relates to a deflection yoke for color cathode ray tubes, and in particular, by appropriately determining the winding distribution of the toroidal coil, it eliminates the misconvergence that conventionally occurred due to the winding distribution of the coil. An object of the present invention is to provide a deflection yoke for a color cathode ray tube that has good convergence characteristics.

It is generally known that, for example, in an electromagnetic deflection yoke for an in-line color cathode ray tube, misconvergence can be avoided by making the vertical deflection magnetic field barrel-shaped.

A conventional vertical deflection coil having a toroidal coil defines the winding distribution of the coil as shown in FIG.

In this vertical deflection coil 1, a toroidal coil 2a
and 2b are formed so that the winding start part and the winding end part are densely formed, and the central part is sparsely formed, and due to this winding distribution, a barrel magnetic field is formed inside the deflection yoke.

Thin lines 11 to 18 each indicate lines of magnetic force. When this vertical deflection coil 1 is used, misconvergence occurs in the patterns shown in FIGS. 2A and 2B.

Figure A shows a misconvergence in which the horizontal lines of the side beams at the center of the screen are so-called pressure crosses and reverse crosses at the top and bottom of the screen, and Figure B shows misconvergence of vertical lines in the diagonal parts of the screen.

It is difficult to improve these misconvergence characteristics by adjusting each part, and therefore, when the conventional deflection coil 1 is used, it is very difficult to obtain good convergence characteristics over the entire screen.

In addition, the above misconvergence is achieved by changing the center part in the direction of the barrel (direction convex with respect to the center) in the deflection magnet W, and changing the upper and lower parts (portions indicated by thin lines 11, 12, 17, and 18). In principle, it can be seen that the improvement can be achieved by changing the direction of the bottle cushion (the direction in which it becomes convex toward the center).

Such a change to the deflection magnetic field is achieved by changing the toroidal coil 2a.
This becomes possible by widening the winding angle range in the circumferential direction of 2b.

However, the above-mentioned vertical deflection coil 1 has a two-part structure in which a pair of cores each having a wire wound thereon are assembled by butting each other at a plane including the line A--A in FIG.

Therefore, it is actually difficult to wind the core to the part where the clamp groove for combining the cores is formed.
I can't move up.

For this reason, the angular range in which winding is applied is naturally limited,
Therefore, it is impossible to obtain a deflection magnetic field necessary to eliminate the above-mentioned misconvergence.

The present invention is configured to eliminate the above misconvergence in a deflection yoke having a two-part structure, and one embodiment will be described below with reference to the drawings.

3A and 3B show a plan view and a front view, respectively, of the deflection yaw according to the present invention.

This deflection yoke 10 has a pair of cores 12 a and 12 b provided with toroidal coils 11 a and 11 b butted against each other in a plane including the B-B line, and a clamp member 13 a
, 13b.

The toroidal coils 11a and 11b are respectively connected to the core 1.
2 a, 12 b middle lamp member 1'3 a, 13
It is formed over a predetermined angular range except for the clamp part by b, and the winding density is determined as described later, which has the same effect as equivalently widening the winding angular range in the circumferential direction. I am getting .

Next, the winding density distribution of the toroidal coils lla and llb will be explained with reference to FIG. 4.

In addition, in FIG. 3A, the coils 11a and 11a are indicated by many thin lines.
For convenience of illustration, lb is expressed as dense in a portion with high winding density and sparse in a portion with low winding density.

The coil 11a has a winding start part 15a and a winding end part 16.
It is generally formed by making the winding density higher than that of the relatively uniform winding layer over the entire center part 17a, and by lowering the winding density on both sides of the center part 17a and increasing the winding density in the center. ing.

The winding density distribution of the coil 11 a is as follows: first, the first layer coil 18 a is applied over the entire winding angle range of the coil 11 a, then the second layer coil 19 a -1,
19a-2 except for the center part, and then the third layer coils 20a-1, 20a-2, 20a-3 are applied to the winding start part, center part and winding end part, respectively. It will be done.

Note that the coils 18 a, 19 a-2, 193-2,
20a-1, 20a-2, and 20a-3 are all wound in the same direction.

Furthermore, each winding layer of the three-layered coil 11a is connected by a method such as making the wire feeding pitch rough, and the coil 11a is formed by continuously winding wires.

The other coil 11b is also similar to the coil 11a, and parts corresponding to each part of the coil 11a are denoted by the same reference numerals with a suffix, and the explanation thereof will be omitted.

Therefore, the coils lla and llb are formed so that the winding density is high at the beginning and end of the winding, and the winding density is low at both sides of the center and high at the center.

Although the coils 11a and 11b are each formed in three layers, the method for manufacturing the coils is not limited to this. By changing the winding pitch, etc., it is also possible to form it in one go without repeating it.

Next, the deflection magnetic field formed by the deflection yoke 10 having the above-mentioned toroidal coils lla and llb will be explained with further reference to FIGS. 5 and 6.

In FIG. 4, the coil 11a has a pattern shown schematically in FIG. 6, and this pattern is a combination of the coil pattern shown in FIG. 1 and the coil pattern shown in FIG.

Coils 21a-1, 21a-2, 21 shown in FIG.
8-3, 21b-1, 21b-2, 21b-3 are the fourth
Coils 20a-1 to 20a-3, 20 in the third layer in the figure
The deflection magnetic fields formed by the magnetic fields corresponding to b-1 to b-20 and b-3 are as shown by magnetic lines of force m1 to m8 in the figure.

When observing this deflection magnetic field, it is found that in the central part, the coil 21a
-1-21a-3 and 21b-1-21b-3, it is greatly curved in the barrel direction, and the upper and lower parts are curved in the bottle cushion direction due to the action of coils 21a-2 and 21b-2. I understand that.

Here, coils lla and llb are respectively coils 2a and 2b shown in FIG. 1, and coil 21a-1 shown in FIG.
21a-3, 21b-1 to 21b-3, the deflection magnetic field formed by the coils 11a and 11b is the same as the deflection magnetic field shown in FIG.
The deflection magnetic field shown in the figure is combined to form a magnetic field shown by a plurality of lines of magnetic force n1 to n8 in FIG. 6.

That is, the magnetic field shown in FIG.
The central part of the figure is influenced by the magnetic field and changes more in the barrel direction, and the upper and lower parts thereof are influenced by the upper and lower magnetic fields in Figure 5 and changes in the bottle cushion direction.

In addition, coils 21 a-1, 21a-3, 21b-1
, 21b-3, by appropriately determining the number of turns, winding angle, etc., the deflection magnetic field can be barreled at the center or the coil 21 a
By appropriately determining the number of turns and the winding angle of -2 and 21b-2, it is possible to appropriately determine the degree of bottle cushion formation in the upper and lower portions of the deflection magnetic field.

As a result, without changing the coil winding angle range, the deflection magnetic field that is formed when the coil winding angle in Figure 1 is expanded to both sides can be obtained, and the Smith convergence shown in Figure 2 A and B can be obtained. In other words, patterns in which the misconvergence of horizontal lines between the top and bottom sides and the center of the screen are reversed, as well as patterns in which the vertical lines are misaligned, are corrected, improving image quality on color television receivers. do.

In addition, in FIG. 6, coils 21 a-1, 213-3, 2
By arranging 1b=1 and 21b-3 close to the B-B line, the misconvergence correction effect described above becomes greater.

In addition, in the above embodiment, in FIG. 4, the coil 20a-
1-20a-3, 20b-1 to 20b-3 are not placed in the uppermost layer, but coils 19a-1, 19a-2,
It can also be placed in the intermediate layer or lower layer of 19b-1, 19b-2, 18a, and 18b, and similar effects can be obtained.

Furthermore, in some cases, the coil 21 shown in FIG.
Even if the configuration includes only a-1 to 21a-3 and 21b-1 to 21b-3, the misconvergence can be corrected.

Furthermore, the deflection yoke according to the present invention can be applied to both in-line arrangement type color cathode ray tubes and filter arrangement type color cathode ray tubes and produces similar effects.

As described above, according to the deflection yoke for a color cathode ray tube according to the present invention, for the vertical deflection toroidal coil, the winding angle range of the wire with respect to the core is not expanded compared to the conventional one, but the same as the conventional one. It is possible to form a deflection magnetic field that is the same as that obtained when the winding angle range is expanded. Therefore, it is possible to form a deflection magnetic field that is the same as that obtained when the winding angle range is expanded. The deflection yoke structure using a two-segment core can effectively avoid misconvergence, where the horizontal line is misaligned and the vertical line is also misaligned, improving the image quality of color television receivers. It has excellent features such as:

[Brief explanation of drawings]

Figure 1 is a diagram showing the winding distribution of a conventional deflection coil, Figures 2A and B are pattern diagrams showing the misconvergence that occurs when the deflection coil of Figure 1 is used, and Figure 3A is a diagram showing the winding distribution of a conventional deflection coil.
and B are respectively a plan view and a front view of an embodiment of the deflection yoke according to the present invention, FIG. 4 is a layout diagram of the winding distribution of the deflection yoke shown in FIGS. 3A and B, and FIGS. 5 and 6. 3A and 3B are diagrams for explaining the deflection magnetic fields formed by the deflection yokes shown in FIGS. 3A and 3B, respectively, according to the present invention. 2a, 2b... Coil, 10... Deflection yoke, 11a. 11 b... Troytal coil, 12 A, 1
2 b... Core, 13 a, 13 b...
...Clamp member, 15a, 15b...
- Winding start part, 16 a, 16 b... Winding end part, 17 a, 17 b... Center part, 18 a
, 18 b...First layer coil, 19 a
-1,19a -2,19b-1,19b-2-・-・
・Second layer no coil, 20a-1, 20a-2,
20a -3, 20b -1, 20b -2, 20b -
3---...-Third layer no coil, 21 a1 to 21a
-3, 21b-1 to 21b-3... Coil, 1
1-189m1-m8. n1 to n8... Lines of magnetic force.

Claims (1)

[Scope of utility model registration request] In a deflection yoke made up of a pair of cores each having a coil wound thereon, the vertical deflection toroidal coil is formed at the winding start and winding end, and has a relatively uniform winding layer throughout. A deflection yoke for a color cathode ray tube having a structure including a high winding part and a winding part formed between a winding start part and a winding end part and having a low winding density on both sides and a high winding density in the center.