KR100355448B1 - Deflection Yoke of Broun tube - Google Patents

Abstract

The present invention relates to a deflection yoke for use in a CRT, and includes a screen flange portion, a first neck portion having a flange, and a deflection yoke for a CRT in which a pair of horizontal deflection coils or a pair of vertical deflection coils is formed in a half-muscle type. A neck deflection coil having a neck portion comprising a second neck portion formed in a horizontal direction, and a main deflection portion connecting the screen flange portion to the first neck portion and including the second neck portion, the main deflection portion length L The ratio (A = l / L) of the length of the second neck portion (l) to is in the range of 0.04 <A <0.24.

As a result, the length l of the second flange portion can be prevented from being lengthened, thereby preventing the neck shadow characteristic from deteriorating, so that an optimum neck shadow margin can be secured, and the length l of the second flange portion is Since the shortening can be prevented, it is possible to satisfy the improvement of the deflection sensitivity for reducing the desired power consumption.

Description

Deflection Yoke of Broun tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to deflection yokes for use in CRT, and in particular, a pair of horizontal deflection coils or a pair of vertical deflection coils in a deflection yoke for a brown tube in which a half-muscle type deflection yoke is used as a main deflection coil The present invention relates to a deflection yoke for a CRT tube which can satisfy both the deflection sensitivity and the characteristics of the neck shadow at the same time by manufacturing within a predetermined range with respect to the length of the second neck flange coil with respect to the length of.

In general, the CRT has an electron gun 4 which emits three electron beams 14 as shown in FIG. 1, a screen 1 on which these electron beams 7 strike a fluorescent surface to reproduce light, and three electron beams ( 7) the shadow mask 2 which distinguishes 7), and the deflection yoke 3 etc. which deflect the electron beam to the predetermined place of the screen 1, and the like. In the drawings, reference numerals 3 and 30 refer to deflection yokes, reference numeral 5 denotes a panel, 6S denotes a screen portion of a funnel, and 6N denotes a neck portion of a funnel.

In this way, the CRT receives the electrical signal of the image from the outside and converts it into a signal of light and displays it as an image having a function of position and content (color) in the space of the screen. The information signal with information is applied to the electron gun to display the desired color on the screen through proper color combinations of R, G, and B electron beams, and the position signal of the image is applied to the deflection yoke 3 and radiated from the electron gun. , B Adjust the position where the electron beam arrives on the screen so that the desired image appears.

This deflection yoke 3 is shown in more detail in FIG. 2. The deflection yoke 3 includes a horizontal deflection coil 31 for deflecting the electron beam emitted from the electron gun 4 in the CRT in the horizontal direction, a vertical deflection coil 33 for deflecting the electron beam in the vertical direction, and Conical ferrite core 34 used to reduce the loss of magnetic force generated in the horizontal deflection coil 31 and the vertical deflection coil 33 to increase the magnetic efficiency, and these horizontal and vertical deflection coils 31 and 33 The ferrite core 34 is fixed to a predetermined position and is composed of a holder 32 for insulation between the horizontal deflection coil 31 and the vertical deflection coil 33.

When the deflection yoke 3 configured as described above is mounted on the neck portion of the CRT and a current is applied to the horizontal deflection coil and the vertical deflection coil, a desired image can be displayed on the screen. The operation of the conventional deflection yoke 3 configured as described above is as follows.

Generally, a current having a frequency of 15.75 KHz or higher flows through the horizontal deflection coil 31 of the deflection yoke and deflects the electron beam in the CRT horizontally by using a magnetic field generated accordingly. In addition, the vertical deflection coil 33 flows a current having a frequency of 60 Hz, and deflects the electron beam in the vertical direction by using a magnetic field generated accordingly.

In recent years, by using a non-uniform magnetic field by the horizontal deflection coil 31 and the vertical deflection coil 33, convergence can be achieved on the screen even when three electron beams do not use a separate additional circuit and an additional device. A self-converging deflection yoke 3 is also being developed that allows this to be achieved.

That is, by adjusting the winding distribution of the horizontal deflection coil 31 and the vertical deflection coil 33, the barrel or pin-cushion type magnetic field is divided into each part (opening part (screen flange part), middle part, and neck part). The three electron beams are subjected to different deflection forces according to their positions so that the three electron beams can be collected at the same points at different distances from the starting point of the electron beam to the screen 1 which is the arrival point.

In addition, in the case of making a magnetic field by flowing current to the horizontal / vertical deflection coils 31 and 33, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the horizontal / vertical deflection coils 31 and 33. The ferrite core 34 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.

In addition, in order to increase the deflection sensitivity, the deflection coil is moved to the electron gun side 4 as much as possible in the design. In this case, the neck shadow (the deflected electron beam hits the funnel portion and creates an area where the screen does not reach the screen) Phenomenon which fails to emit the phosphor in the peripheral corner portion) causes a problem of shortening the distance. On the contrary, when the deflection coil is moved toward the screen 1 to sufficiently secure the neck shadow, the deflection sensitivity, which indicates the ability to deflect the entire screen with a predetermined level of current applied from the outside, becomes worse. You have to flow a lot of current.

Therefore, deflection sensitivity and neck shadow are difficult to be compatible with each other and the design process is optimized to make them both at an appropriate level. This optimization is carried out through simulations to determine the position and dimensions of the coil to a certain level, which is then confirmed and supplemented by engineering.

In addition, the coil size determination work that is developed and manufactured in this way is the recent CRT screen is gradually flattened, CRT developed using the extremely flat screen (1) and the length of CRT, which is one of the biggest disadvantages of CRT, It is getting wider and wider to shrink. Accordingly, as the deflection angle becomes larger, the confirmation of the design value by simulation has a greater meaning, and thus the margin of change in the engineering process is very important.

However, in the case of the conventional flanged coil, as shown in Figure 5 (a), the compensation range is very limited in order to compensate for this in the engineering process when the length and position of the dimension is determined by the simulation.

For example, in the engineering process as described above, the method of compensating for the deflection sensitivity is configured to create an electrically connected state, and the flange (31a), which is a part which hardly produces a magnetic field that actually acts as a deflection, is formed. 31b) The position of the main deflection portion 31d, which is a part which makes the main deflection magnetic field, should be complemented, while minimizing the flange 31a of the opening. However, since it is necessary to change the shape of the winding forming the mechanical shape of the flange-shaped coil 7 it can be said that it is a very difficult state to supplement it in engineering.

In addition, in the case of the muscle coil as shown in Figure 5 (b), there is no flange of the neck portion, unlike the flange-shaped coil, it is possible to adjust the position of the window for a certain level of sensitivity adjustment and neck shadow adjustment, but this It has the disadvantage of changing the overall length of the deflection yoke coil by the basic shape dimension and position, which is limited to engineering work for optimal setting.

Accordingly, the present invention has been made to solve the above problems, and its object is to optimize the deflection sensitivity and neck shadow characteristics among the characteristics of the deflection yoke used in the CRT.

The deflection yoke for the CRT according to the present invention for achieving the above object makes a deflection coil in a hybrid type that takes advantage of the flange type coil and the muscle type coil, the screen flange part, the flanged first neck part and the horizontal direction. A second neck portion for the main deflection portion length L having a neck portion formed of a second neck portion formed therein and a horizontal deflection coil comprising a main deflection portion connecting the screen flange portion to the first neck portion and including a second neck portion; The ratio (A = l / L) of the length 1 is characterized in that it is constituted in the range of 0.04 <A <0.24.

1 is a cross-sectional view of a typical CRT,

2 is a schematic diagram of a general deflection yoke;

3 is a perspective view of a half-muscle deflection coil according to the present invention;

4 (a)-(c) are a front view, a side view, a plan view of a half-muscle deflection coil for explaining the present invention;

Figure 5 (a) (b) is a perspective view of a conventional flange coil and muscle coil.

<Explanation of symbols for main parts of drawing>

1: screen 2: shadow mask

3, (30): deflection yoke 4: electron gun

5: panel 6S: screen part of funnel

6N: neck of funnel 7: electron beam

31: horizontal deflection coil 31a: opening flange coil of horizontal / vertical deflection coil

31b: 1st neck flange coil of horizontal / vertical deflection coil

31c: 2nd neck flange coil of horizontal / vertical deflection coil

31d: Main deflection coil of horizontal / vertical deflection coil

32 holder 33 vertical deflection coil

34: core

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

One embodiment of the present invention is to determine the length (L) of the main deflection portion and the molding ratio of the second neck flange (1) of the half muscle type horizontal deflection coil inserted into the deflection yoke, The case where the molding ratio of the second neck flange 1 is adjusted to a predetermined ratio to produce the optimum molding ratio is shown.

Referring to FIGS. 3 and 4, the winding type of the deflection coil provided in the deflection yoke according to the present invention as shown is a half muscle coil, which is an intermediate shape between a flange coil and a muscle coil. .

3 and 4, the horizontal deflection coil 31 or the vertical deflection coil 33 of the half muscle coil is in the form of a deflection coil capable of optimizing deflection sensitivity and neck shadow properly, and the screen flange coil 31a. And a first half flange coil 31b serving as the first neck portion, a second neck flange coil 31c serving as the second neck portion and a main deflection coil 31d. .

As described above, the length l of the second neck flange relative to the length L of the main deflection coil when winding the deflection coil for manufacturing the half-muscle horizontal deflection coil 31 and the vertical deflection coil 33 is as follows. When the ratio A is set to 0.04 <A <0.24, the optimum design value for deflection sensitivity and neck shadow phenomenon can be obtained.

The predetermined range is set in consideration of the range which may vary depending on the set dimension of the neck flange of the half muscle coil. In designing deflection yoke, in consideration of misconvergence and distortion, and considering deflection sensitivity and neck shadow, there is a direction that can be applied when engineering.

First, when the center of magnetic field produced by the horizontal deflection coil is located on the neck side rather than the center of the vertical deflection magnetic field, misconvergence characteristics can be improved. On the other hand, when the vertical deflection magnetic field is positioned to the neck side than the center of the horizontal deflection magnetic field, it can help to make the distortion of the upper and lower sides of the screen into a barrel shape, but the neck shadow characteristic is worsened as the vertical deflection magnetic field is sent to the neck side.

In addition, if the length of the horizontal deflection coil is lengthened, the overall misconvergence can be induced in a good direction. On the other hand, when the deflection center point is moved to the screen side while the length of the horizontal deflection coil is lengthened, the deflection sensitivity is weakened.

In the case of engineering or simulation based on such a basic design concept, when the value of the ratio A (l / L) is set to 0.24 or more in the horizontal deflection coil, that is, the negative deflection portion compared to the length L of the main deflection magnetic field. The length l of the second flange portion, which can be made, becomes long, and the neck shadow characteristic becomes worse.

On the other hand, when the value of the ratio A (l / L) is set to 0.04 or less, the length l of the second flange portion, which is a negative deflection portion, becomes shorter than the length L of the main deflection portion magnetic field, so that the desired deflection sensitivity is achieved. It will be difficult to secure.

This is explained based on the actual designed length as follows. When the length of the horizontal deflection coil is 99 mm and the length of the main deflection part is 87 mm, the level of A = 0.172 is obtained when the second flange part is made 15 mm. At this time, when the length of the vertical deflection coil is 75mm, the length of the main deflection part is 63mm, and the length of the second flange part is 12mm, when the level is set to A = 0.19 level, the horizontal deflection sensitivity is 15 mHA ² based on 19 ″ brown tube. While securing the level, the neck shadow value can be secured at a level of about 5 mm.

Also, if necessary, the height of the neck flange may be changed, and accordingly, the ratio A may be moved within a certain range. Accordingly, in the case of changing the size of the neck flange, there is a change in the deflection sensitivity, and in order to compensate for this, the second flange may be set larger or smaller to reflect the change in the deflection sensitivity.

As described above, the ratio (A = l / L) of the second neck portion length l to the main deflection portion length L of the horizontal deflection coil disclosed in the present invention is within the range of 0.04 <A <0.24. The length of the second flange portion l can be prevented from being lengthened, so that the neck shadow characteristic can be prevented from deteriorating, so that an optimum neck shadow margin can be secured, and the length of the second flange portion l becomes short. It can be prevented to satisfy the improvement of the bias sensitivity for reducing the desired power consumption at the same time.

Claims (1)

A screen flange which forms an opening of the deflection coil and has a flange formed on a circumferential surface thereof; A neck portion formed of a first neck portion formed in a parallel direction with a predetermined distance from the screen flange and having a flange formed on a circumferential surface thereof, and a second neck portion formed inside the first neck portion; A deflection yoke having a horizontal deflection coil comprising a main deflection portion including the second neck portion while connecting the screen flange portion and the first neck portion, And a ratio (A = l / L) of the length (l) of the second neck portion to the length (L) of the main deflection portion is within a range of 0.04 < A < 0.24.