JPH08153477A - Deflection yoke device - Google Patents

Abstract

PURPOSE: To obtain convergence characteristic most suitable for the required screen size as well as to reduce consumption power. CONSTITUTION: A crossover part 7 out of crossover parts 6, 7 for connecting a pair of longitudinal parts 5a, 5b is provided on a longitudinal direction part 8 in the approximately same direction as the direction of the longitudinal direction part and on an approximately vertical direction part, so as to extend over both directions. Therefore, the effective length and the longitudinal direction part of the deflecting coil can be handled by being completely separated from each other, and the convergence characteristic of the deflection coil and the reduce of consumption power can be made compatible with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device incorporated in a cathode ray tube mainly used for a television receiver, a high-definition television receiver and a display monitor.

[0002]

2. Description of the Related Art As a conventional example, FIG. 6 shows a deflection yoke device in which a horizontal deflection coil and a vertical deflection coil are saddle type coils. 1 is a horizontal deflection coil, 2 is a vertical deflection coil,
Reference numeral 3 is a core, and 4 is an insulating frame for maintaining insulation between the horizontal deflection coil and the vertical deflection coil. As is clear from this figure, the positional relationship of the deflection yoke device is such that the vertical deflection coil 2 is located outside the horizontal deflection coil 1 and the core 3 is located outside the vertical deflection coil 2.

Further, a perspective view of a saddle type vertical deflection coil 16 used in such a conventional structure is shown in FIG.
A side view is shown in FIG. Here, 17 is the longitudinal portion, and 1
8 and 19 are crossover parts. As is clear from FIG.
The vertical deflection coil includes a pair of longitudinal portions 17a and 17b,
The crossover portions 18 and 19 connecting these end portions have a basic structure.

The size of the deflection coil as described above is determined by two factors. One is a convergence characteristic which is an important characteristic when viewed as a display device of a cathode ray tube, and the other is a power consumption which emphasizes power consumption. It is a characteristic.

[0005]

The convergence characteristics and power consumption characteristics of the deflection yoke device having the above basic structure will be examined below. First, the convergence characteristic will be described with reference to the electromagnetic deflection schematic diagram shown in FIG. In this figure, the deflection magnetic field is made uniform by the longitudinal portion 17 of the deflection coil of length l from the back side of the paper to the front for l intervals, and is zero outside, and the electrons are at velocity v from the direction of the arrow. It is incident at right angles to the deflection magnetic field.

That is, the electron beam is emitted from an electron gun, receives deflection energy in a deflection region formed in the longitudinal direction portion 17 of the deflection coil, and is deflected in an arc shape. However,
When the electron beam exits the deflection area, it travels straight at the deflection angle of the exit point. In the case of this example, at the deflection angle θ, the vehicle continues straight ahead and collides with the tube surface, and the fluorescent substance emits light, and an image can be obtained on the cathode ray tube. The deflection angle θ is extended to the electron gun side, and the intersection with an undeflected electron beam is the deflection center.

In such electromagnetic deflection, the portion of the magnetic field generated by the electric wire of the deflection coil that contributes to the deflection of the electron beam is the longitudinal portion 17 that produces the deflection magnetic field, and the crossover portion is not used for electromagnetic deflection. It does not contribute, but simply connects the pair of longitudinal portions. On the other hand, in such electromagnetic deflection, the convergence characteristics are adjusted by shifting the deflection centers of the horizontal deflection coil and the vertical deflection coil in order to cope with various screen sizes.

For example, assuming that the deflection center of the vertical deflection coil is moved toward the electron gun and the horizontal deflection coil is moved toward the tube surface, the actual deflection angle of the vertical deflection coil is apparent as shown in FIG. It becomes smaller and the actual deflection angle of the horizontal deflection coil becomes larger than it appears. Therefore, FIG.
Convergence on the X-axis and Y-axis of the screen of the cathode ray tube shown in No. 1 first adjusts YH, so that the vertical deflection angle becomes smaller because the vertical magnetic field was originally the barrel magnetic field. In order to adjust XH to, the horizontal deflection angle is increased to make the horizontal magnetic field originally a pincushion magnetic field stronger.
Since the vertical deflection magnetic field tends to be the pincushion magnetic field, the diagonal axis also becomes the pincushion magnetic field.

On the other hand, the diagonal requires a pincushion magnetic field as high-inch, wide-angle deflection occurs. It can be explained as follows. In FIG. 9, the deflection amount D is expressed by the following equation.

[0010]

[Equation 1]

Where e: charge of electron
m: electron mass Bz: magnetic flux density (Wb / m ² ) VO: electron beam accelerating voltage That is, the deflection amount D is more effective as the length 1 of the deflection magnetic field and the distance L to the phosphor screen become longer. Convergence is also involved in the distance L. Based on this result, when the horizontal axis is the distance from the deflection center to the phosphor screen and the vertical axis is the diagonal axis pincushion-barrel magnetic field, the graph of FIG. 12 is obtained.

What controls the horizontal axis is the screen size and the deflection angle, and therefore has the following relationship. First, the distance L increases as the screen size increases. Next, when the deflection angle becomes wide, the distance L becomes short.
From the above, it can be seen that if the screen size changes and the distance from the deflection center to the phosphor screen changes, the convergence is not optimal unless the difference between the deflection centers of the horizontal deflection magnetic field and the vertical deflection magnetic field is necessarily changed. And it can be seen that the diagonal requires a pincushion magnetic field with higher inches and wider angle deflection.

However, the center of deflection is set by
In the past, it was the deflection coil longitudinal direction portion. That is, it is necessary to change the horizontal and vertical deflection centers according to the screen size and deflection angle of the cathode ray tube, and it is the deflection coil longitudinal direction portion that changes the deflection center. The length of the part could not be constant due to the convergence characteristics.

Next, the power consumption characteristics will be examined. When the deflection sensitivity is emphasized in order to reduce the power consumption of the television receiver, the magnetic flux density B, which has the greatest influence on the deflection sensitivity.
Is given by the following equation.

[0015]

[Equation 2]

Where n is the number of turns of the deflection coil
i: Deflection current DY: Inner diameter of core Therefore, by decreasing the inner diameter of the core, the deflection sensitivity is improved, which can reduce the power consumption of the television receiver. However, the prerequisite is that
As shown in Fig. 3, the length of the core is made to be the full length of the vertical deflection coil, and the horizontal deflection coil is a distance for maintaining insulation with the entire length of the vertical deflection coil including the crossover part of the vertical deflection coil. Is generally made to coincide with the lengthwise portion of the horizontal deflection coil.

As described above, the convergence characteristic of the deflection coil needs to be set by shifting the deflection center of the horizontal deflection coil and the deflection center of the vertical deflection coil depending on the type of the cathode ray tube, and is set by the power consumption. In that case, the shape must be made by using the entire longitudinal portion of the horizontal and vertical deflection coils. Therefore, the convergence characteristic optimal for the desired screen size of the cathode ray tube and the reduction of power consumption have not been realized in the conventional deflection yoke device.

As described above, in the conventional configuration, if the positional relationship between the horizontal deflection coil and the vertical deflection coil is determined so as to reduce power consumption, the convergence characteristic of the deflection yoke device is determined by the deflection center. Since the length of the longitudinal portion of the deflection coil that determines the deflection center determines the convergence characteristic, it has been impossible to support all screen sizes.

The present invention solves the above-mentioned problems, and it is an object of the present invention to reduce the power consumption and obtain the optimum convergence characteristic for the required screen size.

[0020]

To achieve the above object, according to a first aspect of the present invention, in a deflection yoke device including a horizontal deflection coil, a vertical deflection coil and a core, the horizontal deflection coil or the vertical deflection coil is provided. The shape of at least one of the coils has a pair of substantially parallel longitudinal portions and a crossover portion arranged so as to connect the longitudinal portions, and the crossover portion is the longitudinal portion. In the deflection yoke device, the deflection yoke device is provided so as to extend in both directions of a longitudinal direction portion and a substantially vertical direction portion that are substantially in the same direction as the direction.

In the second invention, the shape of at least one of the horizontal deflection coil and the vertical deflection coil is
It has a pair of substantially parallel longitudinal portions and a crossover portion arranged so as to connect the longitudinal portions at three locations. Of these three crossover portions, a central third crossover portion is provided. Is a deflection yoke device which is provided across both the longitudinal direction portion and the substantially vertical direction portion, which are substantially in the same direction as the direction of the longitudinal direction portion.

[0022]

In the first aspect of the present invention, since the crossover portion connecting the pair of longitudinal portions is provided so as to extend in both the longitudinal portion and the vertical portion, the effective length that determines the deflection center of the deflection coil. It is now possible to completely separate and handle the longitudinal portion that determines the power consumption. Therefore, when the present invention is applied to the horizontal deflection coil, for example, it becomes possible to form a long vertical deflection coil extending toward the electron gun side of the horizontal deflection coil, and desired convergence characteristics can be obtained. When the present invention is applied to the vertical deflection coil, the core can be arranged at a desired position of the horizontal deflection coil by using a core longer than the length of the vertical deflection coil in the longitudinal direction. Convergence characteristics can be obtained, and power consumption of the deflection yoke can be reduced.

In the second aspect of the invention, of the crossover parts, the third part at the center
Since the crossover wire part of the above is provided in both the longitudinal direction part and the vertical direction part, it is possible to provide the crossover wire part capable of reducing the desired convergence characteristics and power consumption within a limited gap. became.

[0024]

【Example】

(Embodiment 1) A saddle type vertical deflection coil will be described below as an embodiment of the present invention with reference to the drawings. FIG.
A perspective view of the saddle type vertical deflection coil 2 of the present invention is shown in FIG. 2 (a), (b) and (c) are a left side view, a front view and a plan view of the coil of FIG. In FIG. 1, 5
Is a longitudinal portion, and 6 and 7 are crossover portions. The crossover portion 7 is provided with a longitudinal portion 8 having substantially the same orientation as that of the longitudinal portion 5. Therefore, the crossover portion is formed across both the longitudinal direction portion 8 and the substantially vertical direction portion.

When the deflection coil constructed as described above is used, the effective length of the coil that contributes to the deflection of the electron beam is the portion before the crossover portions 7 and 8 are formed.
Is the part indicated by. In other words, in this case, all of the longitudinal portions do not generate a deflection magnetic field. That is, although the effective length J for generating the deflection magnetic field and the longitudinal portion 5 which is the shape of the deflection coil have the same shape, they can be separated.

Therefore, as shown in FIG. 3, the deflection center O of this vertical deflection coil is not the center of the longitudinal portion 6 but the center of the portion indicated by J in the drawing. As described above, in the deflection coil of the present invention, the position of the deflection center O can be freely set regardless of the coil length, so that the length of the longitudinal portion of the vertical deflection coil, which contributes to the horizontal deflection power consumption, can be increased. The length is defined by the required length of the horizontal deflection coil, and the deflection center responsible for convergence can be set freely within its longitudinal section.

As described above, when using a saddle type vertical deflection coil characterized by having a deflection center point that can be freely set in the longitudinal direction of the deflection coil and incorporating this into a horizontal deflection coil, The difference between the deflection centers of the horizontal deflection coil and the vertical deflection coil is freely set with respect to the deflection center of the horizontal deflection coil. Therefore, it can be assembled by the method shown in FIG.

The same applies when the present invention is applied to a saddle-type horizontal deflection coil, and the deflection center of the horizontal deflection coil need not be located at the center of the longitudinal direction, but the effective length of the deflection coil is required. You can choose to match the characteristics,
By setting the lengthwise portion and the effective length portion to have different dimensions, it is possible to set the horizontal deflection coil without being influenced by the dimensions of the vertical deflection coil.

(Second Embodiment) A second embodiment of the present invention will be described below. In FIG. 4, reference numeral 9 is a saddle-type horizontal deflection coil, and a pair of longitudinal portions 10 and crossover portions 11, 12, 13 arranged to connect the longitudinal portions at three locations.
Was provided. FIG. 5 is an explanatory view of the third crossover line portion 13 at the center of the crossover line portion, and the crossover is performed in both directions of a longitudinal direction portion 13a and a substantially vertical direction portion 13b which are substantially in the same direction as the direction of the longitudinal direction portion 10. Is provided.

With the above-described structure, the third connecting wire portion 13 does not have a void on the outside like the first connecting wire portion 11 and the second connecting wire portion 12, and does not have an inner space. Since there is the glass cone portion 14 of the cathode ray tube and the vertical deflection coil 15 is located outside, there is a gap, and the gap forming the third crossover portion is a very limited portion.

That is, if the area of the longitudinal direction portion 13a of the third connecting wire portion 13 is increased, the effective length portion becomes short, which is against the reduction of the power consumption of the deflection coil. Further, if the area of the longitudinal portion and the vertical portion 13b is increased, it means that the inner diameters of the vertical deflection coil and the core are increased,
This is also against the power consumption reduction. Therefore, in order to form the crossover portion of the horizontal deflection coil in the limited gap, the third crossover portion is divided into two directions as in the present invention.

[0032]

As described above, according to the first aspect of the present invention, a crossover portion connecting a pair of longitudinal portions is formed so as to extend in both the direction of the longitudinal portions and the direction substantially the same as the vertical portions. By doing so, the effective length of the deflection coil and the longitudinal portion can be handled completely separately, the desired convergence characteristics can be obtained, and the power consumption of the deflection yoke can be reduced, and the screen of the cathode ray tube can be reduced. The deflection coil can be configured according to the size and deflection angle.

Similarly, in the second invention, the third crossover portion is provided so as to extend in both the longitudinal direction portion and the vertical direction portion, so that the same effect as that of the first invention can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a saddle type vertical deflection coil of the present invention.

2A is a left side view of the coil, FIG. 2B is a front view, and FIG. 2C is a plan view.

FIG. 3 is an explanatory diagram of an effective length and a longitudinal portion that determine a deflection center of a deflection coil.

FIG. 4 is a plan view showing a second embodiment.

FIG. 5 is a cross-sectional view of a third connecting wire portion in the second embodiment.

FIG. 6 is a half sectional view of a saddle type deflection yoke device.

FIG. 7 is a perspective view of a conventional vertical saddle type deflection coil.

8A is a left side view of the coil, FIG. 8B is a front view, and FIG. 8C is a plan view.

9 is an explanatory diagram of electromagnetic deflection of the vertical deflection coil shown in FIG.

FIG. 10 shows the deflection center of the vertical deflection coil near the electron gun,
Explanatory drawing when the horizontal deflection coil is moved toward the tube surface

FIG. 11 is an explanatory diagram of X-axis and Y-axis of a cathode ray tube screen.

FIG. 12 is a graph in which the horizontal axis represents the distance L from the deflection center to the phosphor screen and the vertical axis represents the pincushion-barrel magnetic field on the diagonal axis.

FIG. 13 is an explanatory view showing the order of assembling the deflection coil.

[Explanation of symbols]

 1 Horizontal Deflection Coil 2 Vertical Deflection Coil 3 Cores 5, 5a, 5b Longitudinal Sections 6, 7, 8 Crossovers 10, 10a, 10b Longitudinal Sections 11, 12, 13 Crossovers

Claims (2)

[Claims] 1. A deflection yoke device comprising a horizontal deflection coil, a vertical deflection coil, and a core, wherein at least one of the horizontal deflection coil and the vertical deflection coil has a shape in which a pair of longitudinal portions are substantially parallel to each other. And a crossover line portion arranged so as to connect the longitudinal direction portion, and the crossover line portion extends in both directions of the longitudinal direction portion and the substantially vertical direction portion substantially in the same direction as the direction of the longitudinal direction portion. A deflection yoke device characterized in that it is provided. 2. A shape of at least one of the horizontal deflection coil and the vertical deflection coil, wherein the shape of at least one of the coils is substantially parallel, and the crossover portion is arranged so as to connect the longitudinal portions at three locations. Of these three crossover portions, the central third crossover portion is provided across both the longitudinal direction portion and the substantially vertical direction portion in the same direction as the direction of the longitudinal direction portion. The deflection yoke device according to claim 1, wherein