KR20040073902A - Color Cathode-ray Tube - Google Patents

Abstract

PURPOSE: A color CRT is provided to adjust the distortion of left and right side pins in a screen by mounting a permalloy iron piece for correcting a deflection yoke on a neck part of a deflection yoke holder. CONSTITUTION: A color CRT comprises a panel, a funnel, a deflection yoke, an electron gun, and a shadow mask. The deflection yoke includes a vertical and horizontal deflection coils for deflecting vertically and horizontally electron beams, a ferrite core for increasing the efficiency of the deflection coils, and a holder for fixing the deflection coils and the ferrite core. A pair of permalloy iron pieces(30) having a high magnetic permeability is attached to one of both sides of a deflection yoke holder neck part.

Description

Color Cathode Ray Tube {Color Cathode-ray Tube}

The present invention relates to a deflection yoke for a cathode ray tube having a saddle-type deflection coil, and to deflects a side pin unbalance problem occurring in a monitor set or a TV set screen, and to deflect iron pieces made of permalloy material for correction in a deflection yoke The present invention relates to a color cathode ray tube that can be mounted on the upper side of the yoke neck portion to correct left and right side pin-shaped distortion.

In general, a color cathode ray tube uses an in-line electron gun, and the red (R), green (G), and blue (B) electron beams are arranged side by side in a horizontal manner. In order to converge to the point, the deflection yoke of the cathode ray tube employs a self-Cnuverging using a non-uniform magnetic field.

As shown in FIG. 1, the color cathode ray tube has a panel 2 mounted on the front side of the cathode ray tube and a fluorescent surface coated with phosphors of red (R), green (G), and blue (B) on the inner surface of the panel. (3), a shadow mask (4) having a color screening function of electron beams incident from the rear of the fluorescent surface to the fluorescent surface, a funnel (5) coupled to the rear surface of the panel to maintain the interior in a vacuum state, and An electron gun 7 mounted inside the tubular neck portion retracted to the rear of the funnel and firing an electron beam, and a deflection yoke installed to deflect the electron beam 8 in a horizontal or vertical direction surrounding the outer side of the funnel. It consists of (6).

2 is a schematic view showing a deflection yoke of a color cathode ray tube, in which a pair of horizontal deflection coils 12 and an electron beam are vertically deflected to deflect an electron beam emitted from an electron gun 7 inside the cathode ray tube in a horizontal direction. It consists of a pair of vertical deflection coils 13 for deflecting in the direction.

In addition, the conical ferrite core 14 and the horizontal and vertical deflection coils, and the ferrite core, which are used to reduce the loss of the magnetic force generated by the current flowing through the horizontal and vertical deflection coils, improve the deflection efficiency. The holder 11 is formed to be fixed and coupled mechanically while determining the relative position, and to be coupled to the cathode ray tube while serving to insulate the horizontal deflection coil and the vertical deflection coil.

On the neck side of the holder, a comma-free coil 20 for improving comma aberration generated by a vertical barrel type magnetic field, and a ring band installed at the neck end of the holder to mechanically couple the cathode ray tube and the deflection yoke. (15) and the like.

In the deflection yoke, the horizontal deflection coil connects the upper deflection coil and the lower deflection coil in parallel to apply a horizontal deflection current, thereby forming a horizontal deflection magnetic field, thereby acting to deflect the electron beam emitted from the electron gun in the horizontal direction. .

The conventional deflection yoke flows a current having a frequency of 15.75 KHz or higher to the horizontal deflection coil and deflects the electron beam inside the cathode ray tube in a horizontal direction by using a magnetic field generated therein, and usually 60 Hz to the vertical deflection coil. The current having a frequency of was flowed and the electron beam was deflected in the vertical direction by using the magnetic field generated accordingly.

Recently, self-convergence-type deflection yokes are mainly developed that allow three electron beams to achieve convergence on the screen without using additional circuits and additional devices by using non-uniform magnetic fields caused by the horizontal and vertical deflection coils. have.

In other words, by adjusting the winding distribution of the horizontal deflection coil and the vertical deflection coil, each part (opening part, middle part, and neck part) is made into a barrel or pincushion type magnetic field so that the three electron beams experience different deflection forces according to their positions. By doing so, it can be collected at the same point at different distances from the starting point of the electron beam to the screen (2) which is the arrival point.

In the case of making a magnetic field by flowing current to the deflection coil, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the coil, thereby minimizing the loss on the return path of the magnetic field by using a ferrite core 14 having a high permeability. The magnetic force is increased by increasing the efficiency of the magnetic field.

3 is a rear view of a deflection yoke for a cathode ray tube, and includes an upper horizontal deflection coil and a lower horizontal deflection coil formed in a saddle shape, and connect the upper and lower horizontal deflection coils in parallel to flow a horizontal deflection current of a sawtooth wave shape. The zoom forms a pincushion-shaped horizontal deflection magnetic field.

The pincushion type distortion is represented by left and right side (L / R) pin distortions, upper and lower (T / B) distortions, and inner distortions therein.

In general, the upper and lower distortions are corrected by using a correction circuit, and the left and right side pins and inner distortions are fixed by attaching a silicon piece of material on the upper and lower sides of the holder neck of the deflection yoke or by using a correction circuit. .

However, the silicon steel sheet having a low permeability relative to the left and right side pin distortion has a weak correction amount, and when corrected by using a correction circuit, there are problems such as an increase in power consumption required for the correction and space securing according to the need of the correction circuit.

The present invention is to solve the above problems, by mounting the deflection yoke correction permalloy iron piece in the deflection yoke holder neck portion to adjust the left and right side pin distortion without correction circuit to reduce the manufacturing cost and power consumption due to circuit deletion The purpose is to provide a color cathode ray tube that can be made.

1 is a cross-sectional view showing a common color cathode ray tube.

2 is a schematic view of a deflection yoke for a conventional color cathode ray tube.

3 is a rear view of a deflection yoke for a conventional color cathode ray tube.

Figure 4 is a rear view of the deflection yoke attached to the permalloy iron piece according to the present invention.

5 is a view showing a change in convergence according to the permalloy iron piece attachment position of the deflection yoke.

6 is a view showing the change of the side pin according to the tilt (Tilt) of the deflection yoke attached to the permalloy iron piece.

*** Explanation of symbols for the main parts of the drawing ***

1: cathode ray tube 2: panel

3: fluorescent surface 4: shadow mask

5: funnel 6: deflection yoke

7: electron gun 8: electron beam

Technical means of the present invention for achieving the above object, a panel having a screen on the inner surface, a funnel mounted with a cone portion on the back of the panel, a deflection yoke for deflecting the electron beam in a horizontal or vertical direction surrounding the outer of the funnel And a shadow mask having an electron gun inserted into a neck portion of the funnel to emit an electron beam toward a screen, and a shadow mask having a plurality of electron beam through holes arranged at regular intervals on an inner surface of the panel. Is a holder for fixing vertical and horizontal deflection coils for deflecting the electron beam vertically and horizontally, ferrite cores for improving the deflection efficiency of the vertical and horizontal coils, and vertical and horizontal deflection coils and ferrite cores in predetermined positions. And a pair of high permeability fur on the left or right side of the deflection yoke holder neck portion. It characterized in that the iron piece is attached Roy.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a rear view of a deflection yoke in which a permally iron piece is formed according to the present invention, wherein the deflection yoke 6 is a pair for deflecting an electron beam emitted from an electron gun inside a cathode ray tube in a horizontal and vertical direction. Ferrite core, horizontal and vertical deflection coils, ferrite cores, etc., which are used to improve the deflection efficiency by reducing the loss of magnetic force generated by the horizontal and vertical deflection coils and the current flowing through the horizontal and vertical deflection coils. It is mechanically fixed and coupled while determining the mechanical relative position, and serves to insulate between the horizontal deflection coil and the vertical deflection coil, and at the same time includes a holder that can be coupled to the cathode ray tube.

And a comma-free coil on the neck side of the holder to improve comma aberration generated by a vertical barrel type magnetic field, and a ring band installed on the neck side of the holder to mechanically couple the cathode ray tube and the deflection yoke. It is composed.

On the left or right side of the deflection yoke holder neck portion, a pair of high permeability permalloy 30 iron pieces are formed.

Preferably the permalloy iron piece is to be installed on either side of the left and right about the tube axis.

The deflection yoke in which the permalloy iron pieces are formed is preferably applied to a cathode ray tube having no left and right side pin distortion correction circuits.

Also, preferably, the material of the permalloy iron piece is made of iron and nickel.

5 shows the convergence change according to the permalloy iron piece attachment position of the deflection yoke.

As shown, when the permalloy iron piece is attached to the left or right side of the deflection yoke holder neck portion, red and blue beam arrays on the cathode ray tube screen are opened to reduce convergence characteristics.

In order to prevent the deterioration of the convergence, a wedge is used to have the tilt in a direction opposite to the position where the permalloy iron piece is attached.

Figure 6 shows the change of the side pins according to the tilt (Tilt) of the deflection yoke attached to the permalloy iron piece.

As shown in FIG. 6, when the deflection yoke is biased in the direction of the arrow, the side pins on the screen move in opposite directions, thereby improving side pin imbalance.

As described above, the present invention can improve the unbalance of the side pins generated at the left and right sides by biasing the deflection yoke in a predetermined direction to reduce the convergence of the screen caused by attaching the permalloy iron piece to the deflection yoke.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As can be seen from the above, the present invention has the effect of reducing the manufacturing cost and power consumption by eliminating the circuit by adjusting the left and right side pin distortion without the correction circuit by mounting the deflection yoke correction permalloy iron piece on the deflection yoke holder neck portion. have.

Claims (4)

A panel having a screen on an inner surface, a funnel mounted with a cone portion on a rear surface of the panel, a deflection yoke surrounding the outer side of the funnel, and deflecting the electron beam in a horizontal or vertical direction; an electron beam inserted into a neck portion of the funnel and directed toward the screen In the color cathode ray tube comprising an electron gun for emitting a shadow mask having a plurality of electron beam through holes arranged at regular intervals on the inner surface of the panel, The deflection yoke includes vertical and horizontal deflection coils for deflecting the electron beam vertically and horizontally, ferrite cores for improving deflection efficiency of the vertical and horizontal coils, and vertical and horizontal deflection coils and ferrite cores at predetermined positions. Including a holder for fixing, A pair of high permeability permalloy iron pieces are attached to the left or right side of the deflection yoke holder neck portion. The method of claim 1, The permalloy iron piece is a color cathode ray tube, characterized in that installed on either side of the tube axis. The method of claim 1, And said deflection yoke does not have left and right side pin distortion correction circuits. The method of claim 1, The material of the permalloy iron piece is a color cathode ray tube, characterized in that consisting of iron and nickel.