KR810002006B1 - Deflection unit for in-line color cathode tube - Google Patents

Abstract

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Description

Deflection unit for in-line color cathode tube

1 is a schematic cross-sectional view of a cathode ray tube with a deflection unit.

2 is a schematic representation of a deflection unit according to the invention suitable for use in a cathode ray tube of a screen of the first type.

3 is a schematic diagram illustrating the deflection unit of FIG. 2 suitable for use in a cathode ray tube having a large screen of the second type.

4 is a state curve diagram of a magnetic field generated in the axial direction by the deflection unit shown in FIG.

5 is a state curve diagram of a magnetic field generated in the axial direction by the deflection unit shown in FIG.

The present invention relates to a deflection unit for use in an in-line type color cathode ray tube having a phosphor structure that does not divide a screen, wherein the deflection unit according to the present invention comprises a yoke ring of a ferromagnetic material and a front end surrounded by the yoke ring; It has a saddle-type first deflection winding having a rear end, and the deflection unit is installed in the cathode ray tube so that the electron beam generated in the sound tube passes through the first deflection winding from the rear end to the front end. And a second deflection winding for deflecting the electron beam in the first direction by the one deflection winding and further deflecting the electron beam generated in the cathode ray tube having the front end and the rear end in the direction crossing the first direction. In order to calibrate the large version (focusing), it is possible to omit a commonly used device.

Since then, cathode ray tubes using three electron beams in one plane have become popular, and this type of cathode ray tube has been called a "line-in-line" type. In order to reduce the convergence error of the electron beam, a deflection unit having a frame deflection winding which generates a section type magnetic field and a line deflection winding which generates a barrel type magnetic field is generally used. In particular, such a deflection unit has a combination of a saddle-type line deflection winding and a frame deflection winding wound conically on the yoke ring.

However, the use of an "autofocused" deflection unit with certain geometrical conditions in an in-line cathode ray tube only eliminates the convergence error in any type of screen. Thus, in order to autofocus a certain deflection unit for other types of screens, it is necessary to change the main geometrical conditions (eg the length of the windings) or install a separate calibration device. Therefore, from a manufacturing point of view, a deflection unit which does not need to change the main specifications of the line and frame deflection windings and which does not need to install an extra calibration device is automatically focused on other types of screens.

An object of the present invention is to provide a deflection unit that satisfies the above requirements.

Therefore, the deflection unit according to the present invention has the front ends of the first and the second windings positioned at a distance from each other by S, and when the deflection unit is installed on the cathode ray tube, the deflection unit is automatically focused on the screen of the first type. The distance S is changed by ΔS by moving the second winding with respect to the first winding so that the deflection unit becomes an automatic focusing type for the screen of the second type, in which case ΔZs is defined as the first winding. The distance change between the front end of the winding and the screen is characterized by having a relationship of ΔS = αΔZs when 0.05 <α <0.3.

In the embodiment of the present invention, both the first and the second deflection windings may be saddle-shaped (the second deflection winding may be surrounded by the yoke ring), and the winding structure of the back end is flat (so-called shell winding) ), The windings can be easily moved to each other.

Within the scope of the present invention, the second deflection winding can be conically installed around the yoke ring so that the second deflection winding can be moved particularly simply (with yoke ring), and this (hybrid) structure Can be very easily adapted to a series of screens.

In this example, the value of α is set to about 0.1. Depending on the design of the deflection unit, the value of α may vary between about 0.05 and 0.3, so the distance ΔS required to move the second deflection winding relative to the first deflection winding may be longer or shorter depending on the particular design.

The mislanding in the Y direction at the corners, when automatically focused on the axis by changing the distance S starting from any deflection unit, may cause any other type of screen (e.g. 14, 16, 18 of a 90 ° deflection tube). And 20 inch screens). In some cases, the distribution of conductors forming the winding may be slightly altered (within a few degrees) to maintain full focus on the axis. In this case, however, the main geometrical conditions remain unchanged.

The present invention also relates to an in-line type color cathode ray tube having a structure of a phosphor line which does not divide an aqueous screen by including a deflection unit of an automatic focusing type as described above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing an in-line collar water tube 1, 2 being a water screen, 3 being a neck and 4 being three electron guns located in one plane. The fixed deflection unit 5 against this screen consists of a rotationally symmetrical yoke ring 6 and a set of line deflection saddle coils 7 (so-called line windings) and a set of frame deflection coils 8 conically surrounding the yoke ring 6 ( So-called frame winding).

Slidingly moving the frame winding relative to the line winding, starting from line windings and frame windings of any given geometric condition, has been found to be particularly beneficial for adjusting (crossing) the third order anisotropic astigmatism.

The change sensitivity of the crossing is 10 times better when the deflection points move with each other than, for example, the entire deflection system that is always focused on the axis.

Until now, in general, in the in-line deflection system, the conditions in the delta type deflection system, i.e., the line deflection center and the frame deflection center are coincident with each other. It has been thought that it needs to be done. As will be described below, the present invention provides an in-line deflection unit for use in combination with a water tube having an undivided line-type phosphor, in order to improve connection and frame efficiency. It is based on the fact that the position can be adjusted optimally.

The color water tube, developed in recent years, has two features as described below. In other words, first, the electron gun is converted from the delta to the in-line, and the corresponding deflection system is also converted from the non-focusing type to the automatic focusing type. The point is converted into a line structure.

If the deflection system needs to meet the requirements regarding focusing and frame shape and purity (such as color purity, landing conditions, etc.), the individual components that make up the deflection system are specially designed for wires suitable for automatic focusing, for example. It is necessary to satisfy the requirements such as distribution in the form.

In terms of purity, deflection units that meet the requirements for focusing, frame, and transition spaces are then used by the exposure optical system to ensure that the optical exposure and deflection points are subsequently matched during the manufacturing of the water screen. It is the purpose of the water pipe designer to impart electro-optic properties to the deflection unit.

In the case of non-automatic focusing deflection unit, the electron layer is arranged in delta type, it causes trio distortion (and deviation of deflection point) when deflection operation is performed, which is inconsistent with the requirement for exposure optical system. In terms of purity, the generally accepted requirement given to the characteristics of the deflection unit is that in the case of delta type deflection systems, the line and frame deflection points coincide and continue to be consistent during deflection.

In the in-line type automatic focusing color television receiver, the deflection point of the line and the frame has different characteristics, so it is necessary to give up the hexagonal mask structure, which is ideal for purity characteristics, and use it as a mask of the line structure. Is considered. The line structure of the phosphor is characterized in that the line phosphor is not divided, and the visual requirement is the same as that of the mask structure, but is half the width of the original phosphor dot width.

According to these continuous line phosphors, in principle, suitable results are obtained in which no misalignment (no landing of a beam on a predetermined color dot) can occur in the direction in which these phosphors extend.

As a result, even if another change occurs in the deflection point of the frame winding with respect to the line winding, this change can be easily allowed.

In this case, whether the line and frame deflection points coincide or do not coincide even in the case of a deflection of almost 0 ° is not already important in principle.

That is, in the delta deflection system, the line and frame deflection points coincide with each other, so that the deflection points must be coincident during deflection. Since the above requirement can be omitted.

(Note that this is not due to arranging the electron gun in-line).

It is also within the scope of the present invention to apply the present invention to deflection unit 5 of a water tube having a screen 2 'of a different type than screen 2.

Next, a description will be given with reference to FIGS. 2 and 3.

FIG. 2 is an enlarged side view of the deflection unit 5 shown in FIG. The deflection unit 5 is supported by the assembly cap. As shown, 9 is the front of the assembly cap, 10 is the center, and 11 is the rear. The yoke ring 6 consists of two parts, both of which are fixed by a fixing spring 12. Conical frame winding 8 is installed around yoke ring 6. Only the front side 13 of the line winding 7 is shown in the figure. In order to automatically focus a certain type of screen (e.g. a 90 ° deflection tube with an 18 inch screen) by means of deflection unit 5, the frame winding 8 is placed at a certain position relative to the line winding 7 Secure the frame windings using filling blocks 14 and 15 in the. S is the distance between the front side 13 of the line winding 7 and the front side of the frame winding 8.

The same components as those in FIGS. 1 and 2 in FIG. 3 have the same reference numerals. 3 shows a state in which the above-mentioned distance S is changed to S 'by removing blocks 14 and 15 and moving the frame winding 8 to fix the frame winding to a new position using the charging block 16. FIG. In this case the deflection unit 5 automatically focuses on the screen of the second type (90 ° deflection tube with a large, eg 20 inch screen). To this end, in this embodiment, the frame winding 8 is moved about 5 mm to the rear, but the shape of the screen is changed by 2 inches, and as shown in FIG. 1, the distance is changed by ΔZs so that the water screen from the front part of the line winding 7 is changed. The distance to 2 'is also increased.

In the deflection unit of the type as shown in FIG. 2, the magnetic field distribution in the axial Z has the frame position H of the peak value P _L (Gaussian line deflection point) of the line magnetic field H _L as shown in FIG. position of the peak of _B is distributed so as to be located at points apart by a small distance D from the P _B (the frame deflection point Gauss).

When the deflection unit has a shape as shown in FIG. 3, the distance D 'between the line deflection point and the frame deflection point is larger than the distance shown in FIG.

When D'-D = ΔD, ΔZs is the distance change amount between the front part of the line winding and the screen, β is a specific factor depending on the design of the deflection unit, and in this case, 0.05 <β <0.2 The relationship of ΔD = βΔZs is established.

When the frame winding is moved together with the yoke ring, the line magnetic field also moves slightly, so that the distance ΔS for moving the frame winding (like the yoke ring) is also slightly larger than the deviation distance ΔD of the deflection point.

Claims (1)

A deflection unit for an in-line type color cathode ray tube having a yoke ring 6 of a ferromagnetic material and a saddle-shaped first deflection winding 7 and a second deflection winding 8, wherein the deflection unit 5 is provided. Both front portions of the first deflection winding 7 and the second deflection winding 8 are disposed so as to be separated from each other by S so as to be automatically focused with respect to the screen of the first type, and the second deflection winding is the distance S with respect to the first deflection winding. Is shifted by ΔS and becomes the automatic focusing type for the screen of the second type, where ΔS = αΔZs is established when ΔZs is 0.05 <α <0.3 with the distance change between the front end of the first deflection winding and the screen. Deflection unit for in-line color cathode ray tube, characterized in that.

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