KR20030013550A - Deflecting yoke of a color cathode ray tube - Google Patents

Abstract

PURPOSE: A deflection yoke of a color cathode ray tube is provided to improve the adjustment between a cathode ray tube and a deflection yoke by placing the thickness of a neck flange and the position of an adjusting bar from the neck flange in a predetermined ratio. CONSTITUTION: A horizontal deflection coil is comprised of a screen flange coil(21a), a first neck flange coil(21b), a second neck flange coil, and a main deflection coil(21d). A ratio of a thickness 't' of the first neck flange(21b) and a position 'z' of an adjusting bar(30) located onto an electron gun from the first neck flange(21b) is defined as 'a=t/z'. The ratio has a>=1.6. As a result, an asymmetry between red beam and blue beam appeared on left and right sides of a screen is solved by a leakage magnetic field control method so that the deflection sensitivity is maintained in an appropriate level.

Description

Deflection yoke of a color cathode ray tube}

The present invention relates to a cathode ray tube, and more particularly, to a cathode ray tube for improving the ITC control between the cathode ray tube and the deflection yoke by positioning the flange thickness of the horizontal deflection coil and the correction bar away from the flange at a predetermined ratio. It is about.

1 is a view showing a conventional cathode ray tube, Figure 2 is a schematic view showing a deflection yoke of a conventional cathode ray tube,

As shown in FIG. 1, the conventional cathode ray tube is coupled to the panel having a fluorescent surface formed on an inner surface thereof to form a screen 10, a shadow mask 12 installed at a predetermined distance from the panel, and A funnel 14 having a neck portion 14a provided at the rear, an electron gun encapsulated in the neck portion 14a to generate three color electron beams, and a deflection yoke 20 coupled to the outer circumference of the neck portion 14a. ) Is included.

In addition, such a color cathode ray tube has an inner shield fixed to the support frame so that the spring and the cathode ray tube are less susceptible to external geomagnetism during operation so that the support frame with the shadow mask 12 is coupled to the panel. It is sealed by high vacuum in state.

In the conventional color cathode ray tube configured as described above, the electron beam generated from the electron gun enclosed behind the funnel 14 strikes the fluorescent surface formed on the inner surface of the panel by the anode voltage applied to the cathode ray tube. At this time, the electron beam is deflected up and down and left and right by the deflection yoke 20 before reaching the fluorescent surface to hit the fluorescent surface to form a screen.

As shown in FIG. 2, the deflection yoke 20 includes a horizontal deflection coil 21 for deflecting the electron beam emitted from the electron gun inside the cathode ray tube in the horizontal direction, and a vertical deflection for deflecting the electric electron beam in the vertical direction. A deflection coil 22, a conical ferrite core 23 for reducing magnetic losses generated in the horizontal and vertical deflection coils 21 and 22 to increase magnetic efficiency, and the horizontal and vertical deflection coils 21. And a holder 24 for fixing the 22 and the ferrite core 23 to a predetermined position and for insulating the horizontal deflection coil 21 and the vertical deflection coil 22 from each other.

The horizontal and vertical deflection coils 21 and 22 are deflection coils capable of properly optimizing deflection sensitivity and neck shadow as shown in FIG. 3, and include screen flange coils 21a and first neck flange coils 21b, It consists of the 2nd neck flange coil 21c and the main deflection part coil 21d, and is formed in the shape of a half mussel.

Here, the neck shadow refers to a phenomenon in which the deflected electron beam hits the funnel portion and creates an area where the deflected electron beam does not reach the screen, thereby failing to emit phosphors in the corners around the screen.

The flange-shaped deflection coil shown in FIG. 4 has no second neck flange coil in the half-muscle-shaped deflection coil shown in FIG. 3.

The conventional deflection yoke 20 as described above flows a current having a frequency of 15.75 kHz or higher to the horizontal deflection coil 21, thereby deflecting the electron beam inside the cathode ray tube in a horizontal direction by using a magnetic field generated accordingly. In addition, a current having a frequency of 60 Hz is passed through the vertical deflection coil 22 to deflect the electron beam in the vertical direction by using a magnetic field generated accordingly. In addition, self-convergence-type deflection allows three electron beams to achieve convergence on the screen without using additional circuits and additional devices by using non-uniform magnetic fields by horizontal and vertical deflection coils 21 and 22. York is mainly developed.

That is, the winding distribution of the horizontal deflection coil 21 and the vertical deflection coil 22 is adjusted to make a barrel or pin-cushion type magnetic field for each part (opening part, middle part, neck part), and three electron beams are positioned according to the position. They allow them to experience different deflection forces so that they can be collected at the same point at different distances from the starting point of the electron beam to the screen of arrival. In addition, in the case of making a magnetic field by flowing a current through the deflection coil 20, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the coil. The efficiency is increased to increase the magnetic force. Then, the deflection coil is moved to the electron gun side to increase the deflection sensitivity. This causes a problem of shortening the neck shadow distance. Therefore, in order to lengthen the distance of the neck shadow, the deflection coil must be moved toward the screen, and the deflection sensitivity becomes worse. Therefore, in order to optimize the deflection sensitivity and neck shadow in the horizontal deflection coil 21 or the vertical deflection coil 22 of the deflection yoke 20, the screen flange coil 21a and the first neck flange coil ( 21b), the second neck flange coil 21c, and a half-muscle shape having a main deflection coil 21d, and the flange-shaped deflection coil as shown in FIG. 4 has a second neck flange coil in the half-muscle-shaped deflection coil. It is composed of no form.

When a pair of horizontal deflection coils as described above are coupled to each other and a current is applied to the cathode ray tube, the ITC proceeds as follows.

That is, in order to solve the left and right asymmetry between the R beam and the B beam shown on the left and right of the screen as shown in FIG. 6, a magnetic material is usually attached to the neck portion of the deflection yoke, and the half-muscle horizontal deflection coil 21 is a neck. When the length of the second neck flange coil 21c is extended toward the screen to secure the length of the shadow, the height of the first neck flange coil 21b is lowered, which is the first neck flange coil 21b of the deflection yoke 20. ), There is a problem that the leakage magnetic field is reduced.

Accordingly, there is a problem in that the bar-shaped magnetic material attachment, which is a simple method of using the left and right asymmetry between the R beam and the B beam generated on the left and right sides of the screen adjusted using the leakage magnetic field, cannot be solved.

Accordingly, the present invention has been made to solve the above problems, to improve the ITC control between the cathode ray tube and the deflection yoke by positioning the flange thickness of the horizontal deflection coil and the correction bar away from the flange at a predetermined ratio. The purpose is to provide a cathode ray tube.

1 is a cross-sectional view showing a conventional cathode ray tube,

2 is a cross-sectional view schematically showing a deflection yoke of a typical cathode ray tube;

3 to 4 is a view showing a deflection coil of the deflection yoke,

5 is a view showing a neck flange in a deflection coil of a deflection yoke of a general cathode ray tube;

6 is a view showing a misconvergence pattern of a typical cathode ray tube;

7a and 7b are views for explaining the magnetic field change with or without the correction bar of the cathode ray tube deflection yoke,

8 is a view showing the APH correction amount according to the flange thickness of the cathode ray tube deflection yoke and the position of the correction bar;

* Explanation of symbols for the main parts of the drawings

21; Horizontal deflection coil 21a; Screen Flange Coil

21b; First neck flange coil 21c; 2nd neck flange coil

21d; Main deflection coil 30; Calibration bar

Deflection yoke of the color cathode ray tube according to the present invention for achieving the above object, the horizontal and vertical deflection coils for deflecting the electron beam emitted from the electron gun in the horizontal and vertical direction, and generated in the horizontal and vertical deflection coils In the deflection yoke of a color cathode ray tube comprising a conical ferrite core for reducing magnetic force and increasing magnetic efficiency, and a holder for insulating between the horizontal and vertical deflection coils and the conical ferrite core, the horizontal deflection coil is Comprising a screen flange coil, a first neck flange coil, a second neck flange coil, a main deflection coil, and corrects the left and right asymmetry between the red beam and the blue beam generated on the left and right of the screen from the first neck flange to the electron gun side First bar flange coil of the horizontal deflection coil is to be spaced apart the correction bar for If when the t d, and z of claim 1 the position of the remote compensation bar in the pipe axial direction from the neck flange thickness d, the t / d a z, characterized in that a ≥ 1.6.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the cathode ray tube according to the present invention.

2 is a view showing a deflection yoke of a typical cathode ray tube, Figure 3 is a perspective view showing a half-muscle deflection coil of the deflection yoke, Figure 4 is a side view showing a flanged deflection coil of the deflection yoke. 5 is an enlarged view of a neck flange of a deflection yoke, FIG. 6 is a view showing a pattern of misconvergence, and FIGS. 7A and 7B are views for explaining a magnetic field change depending on the presence of a correction bar. 8 is a view showing the APH correction amount according to the thickness of the flange and the position of the correction bar.

As shown in FIG. 2, the deflection yoke according to the present invention includes horizontal and vertical deflection coils for deflecting the electron beam emitted from the electron gun in the horizontal and vertical directions, and loss of magnetic force generated in the horizontal and vertical deflection coils. Conical ferrite core to reduce the magnetic efficiency is reduced, and a holder for insulating between the horizontal and vertical deflection coil and the conical ferrite core.

The horizontal and vertical deflection coils are in the form of deflection coils capable of optimizing deflection sensitivity and neck shadow as shown in FIG. 3. The screen flange coil 21a, the first neck flange coil 21b, and the second neck flange coil are shown in FIG. 21c and a half-muscle shape having a main deflection coil 21d.

The first neck flange of the half muscle-type horizontal deflection coil 21 inserted in the deflection yoke as shown in Figs. 4 and 5, in order to appropriately perform the ITC control of the deflection yoke and the cathode ray tube having the configuration as described above. A correction bar 30 for appropriately correcting the thickness of the 21b and the left and right asymmetry between the R and B beams generated on the left and right sides of the screen is appropriately positioned from the first neck flange 21b toward the electron gun side, so that the R beam and the B beam It is to generate the appropriate leakage magnetic field to solve the left and right asymmetry.

This will be described in more detail as follows.

As shown in FIGS. 4 and 5, the half bar or flange-shaped horizontal deflection coil 21 is wound around the electron gun side from the thickness t of the first neck flange 21b and the first neck flange 21b. When the ratio between the positions (z) of (30) is a = t / z, the manufacturing is limited to a range of a ≥ 1.6 so that the left and right sides of the screen due to the manufacturing deviation of various components during the ITC between the cathode ray tube and the deflection yoke. The left and right asymmetry between the red beam (R) and the blue beam (B) is simply solved by the conventional leakage magnetic field control method.

That is, due to various kinds of assembling errors between parts of the product, as shown in FIG. 6, left and right asymmetry between the red beam and the blue beam may occur. The deflection yoke of the present invention employing a half muscle coil In order to solve this problem, by limiting the ratio of a to a certain range, the deflection sensitivity can be used while the conventional method of complementing the APH asymmetry using the leakage magnetic field of the neck flanges 21b and 21c can be used. Can be maintained at an appropriate level.

More specifically, FIG. 8 illustrates a measurement value of the variation in the asymmetric APH according to the thickness t of the neck flanges 21b and 21c and the position of the correction bar, and the neck flanges 21b and 21c. The thickness t of) is manufactured in three forms, and the variation of asymmetric APH is measured according to the axial position of the cathode ray tube of the correction bar. The graph of FIG. 8 shows that the smaller the thickness of the neck flanges 21b and 21c is, the smaller the correction amount is, and the farther the measurement position is from the neck flanges 21b and 21c, the smaller the correction amount is.

When the ratio between the thickness t of the first neck flange 21b of the horizontal deflection coil 21 and the position z of the correction bar located on the electron gun side from the flange is a = t / z from the graph of FIG. When manufactured in a range of ≥ 1.6, the APH left and right asymmetric phenomenon using the leakage magnetic field of the neck flanges 21b and 21c of the horizontal deflection coil 21 can be properly compensated.

7A and 7B are diagrams showing changes in the leakage magnetic field with and without the correction bar 30. In the absence of the correction bar 30, the magnetic field passes tightly to the red electron beam, but when the correction bar 30 is present, the magnetic field is attracted to the correction bar 30, so that the magnetic field exerted on the red electron beam is smaller than when there is no correction bar 30. Therefore, the red beam has a small deflection force, so that the distance between the red electron beam R and the blue electron beam B on the right side of FIG. 6 becomes small, thereby correcting the APH asymmetry.

As described above, according to the present invention, since the position of the correction bar from the neck flange thickness and the neck flange is positioned at a predetermined ratio, the left and right asymmetry between the red and blue beams generated on the left and right sides of the screen during ITC can be solved. As a result, product productivity and ITC coordination can be improved.

Claims (1)

Horizontal and vertical deflection coils for deflecting the electron beam emitted from the electron gun in the horizontal and vertical directions, conical ferrite cores for reducing magnetic force loss generated in the horizontal and vertical deflection coils to increase magnetic efficiency, and the horizontal and vertical deflection coils. In the deflection yoke of a color cathode ray tube comprising a holder for insulating between a deflection coil and a ferrite core, The horizontal deflection coil may include a screen flange coil, a first neck flange coil, a second neck flange coil, and a main deflection coil, and the horizontal deflection coils may be spaced apart from the first neck flange to the electron gun. When the thickness of the first neck flange coil is t and the position of the correction bar away from the first neck flange in the axial direction is z, t / z is a, the color cathode is characterized in that a? Deflection yoke of the tube.