KR100418039B1 - Deflecting yoke of a color cathode ray tube - Google Patents

Abstract

The present invention relates to a deflection yoke of a color cathode ray tube, in which horizontal and vertical deflection coils for deflecting an electron beam emitted from an electron gun in a horizontal and vertical direction, and a loss of magnetic force generated in the horizontal and vertical deflection coils are reduced. In the deflection yoke of a color cathode ray tube comprising a conical ferrite core for increasing efficiency and a holder for insulating between the horizontal and vertical deflection coils and the conical ferrite core, the horizontal deflection coil includes a screen flange coil, a first Comprising a neck flange coil, a second neck flange coil, a main deflection coil, the correction bar for correcting 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 is spaced apart The thickness of the first neck flange coil of the horizontal deflection coil is t, When the position of the correction bar away from the flange in the tube axis direction is z, t / z is a, characterized in that a ≥ 1.6. According to this, by adjusting the neck flange thickness and the position of the correction bar from the neck flange at a predetermined ratio, it is possible to solve the left and right asymmetry between the red beam and the blue beam generated on the left and right sides of the screen at the time of ITC, thereby improving product productivity and ITC It is possible to improve the controllability.

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 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 supplied to the vertical deflection coil 22 to deflect the electron beam in the vertical direction by using a magnetic field generated therein. The horizontal and vertical deflection coils 21 and 22 Self-convergence-type deflection yokes are being 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.

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. It allows 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, when the current is applied to the deflection coil 20 to create a magnetic field, the coil It is difficult to deflect the electron beam to the front of the screen by using magnetic field alone, and the high magnetic permeability of ferrite core is used to minimize the loss on the return path of the magnetic field, thereby increasing the magnetic field efficiency and increasing the magnetic force. This causes the deflection coil to move towards the electron gun, which causes the beam to hit the inner surface of the funnel, causing the phosphor on the screen to emit light. The problem of not being able to shorten the neck shadow (BSN) distance is short. On the contrary, in order to increase the distance of the neck shadow, the deflection coil must be moved toward the screen, and in this case, the deflection sensitivity is deteriorated. In order to solve the problems as shown in FIG. 3, the screen flange coil 21a is optimized to optimize the deflection sensitivity characteristics and neck shadow characteristics of the horizontal deflection coil 21 or the vertical deflection coil 22 of the deflection yoke 20. ), A first neck flange coil 21b, a second neck flange coil 21c, and a half-muscle shape having a main deflection coil 21d.

However, 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 typical cathode ray tube, Figure 2 is a schematic cross-sectional view showing a deflection yoke of a typical cathode ray tube, Figure 3 is a perspective view showing a deflection coil of a conventional general deflection yoke. Figure 5 is a perspective view showing a deflection coil. Fig. 5 shows a neck flange shape in a deflection coil of a deflection yoke according to the present invention. Fig. 6 shows a misconvergence pattern of a conventional general cathode ray tube, and Figs. 7a and 7b show the present invention. Figure 8 shows the magnetic field change with or without the correction bar of the cathode ray deflection yoke according to the present invention. Figure 8 is a diagram showing the APH correction amount according to the flange thickness and position of the correction bar of the deflection yoke for cathode ray tube according to the present invention. Explanation of the code for the part

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, the configuration and operation of the cathode ray tube according to the present invention will be described in more detail with reference to the accompanying drawings. First, the deflection yoke according to the present invention allows the electron beam emitted from the electron gun to deflect in the horizontal and vertical directions. A horizontal and vertical deflection coil, a conical ferrite core for reducing magnetic losses generated by the horizontal and vertical deflection coils to increase magnetic efficiency, and a holder for insulating between the horizontal and vertical deflection coils 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, wherein the screen flange coil 21a, the first neck flange coil 21b, It is formed in the shape of a half-muscle having a two neck flange coil 21c and 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. 21b), the correction bar 30 for properly correcting the left and right asymmetry between the R beam and the B beam 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 B It is to generate the proper leakage magnetic field to solve the left and right asymmetry between beams.

This will be described in more detail as follows. Fig. 4 (a) shows a perspective view of the deflection coil according to the present invention, (b) shows a side view of the deflection coil according to the present invention. It shows the shape of the neck flange in the deflection coil of the deflection yoke according to the invention.

As shown in FIGS. 4 and 5, when the half-muscle-type or flange-type horizontal deflection coil 21 is wound, the thickness t of the first neck flange 21b and the position positioned toward the electron gun side from the first neck flange 21b are corrected. When the ratio between the position (z) of the bar 30 is a = t / z, it is limited to a range of a ≥ 1.6 so that the screen may be changed due to the manufacturing deviation of various components during 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) generated on the left and right is simply solved by the conventional method of leakage magnetic field.

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 maintained at an appropriate level while the conventional method of complementing the APH left and right asymmetry using the leakage magnetic field of the neck flange can be used. This will be described in more detail as follows. FIG. 8 illustrates a measurement value of asymmetric APH according to the thickness t of the first neck flange 21b and the position of the correction bar. The thickness t of the neck flange 21b is manufactured in three forms, and the amount of change in the asymmetric APH is measured according to the axial position of the cathode ray tube of the correction bar. As shown in the graph of Fig. 8, the smaller the thickness of the first neck flange 21b is, the smaller the correction amount is, and the farther the measurement position is from the first neck flange 21b, the smaller the correction amount is. If the ratio between the thickness (t) of the first neck flange (21b) of 21) and the position (z) of the correction bar located from the flange to the electron gun side is a = t / z, it is limited to a range of a ≥ 1.6. The APH left and right asymmetry using the leakage magnetic field of the first neck flange 21b of the horizontal deflection coil 21 can be compensated appropriately. FIGS. 7A and 7B show a case in which the correction bar 30 is present or not. As shown in FIGS. 7A and 7B, when the correction bar 30 is absent, the magnetic field passes closely to the red electron beam, but when the correction bar 30 is present, the magnetic field moves toward the correction bar 30. Person who is exerted by red electron beam because of attraction Therefore, the red beam has a smaller 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 smaller, 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.