KR20030072886A - Deflection Yoke for CRT - Google Patents

Abstract

PURPOSE: A deflection yoke is provided to prevent a Beam Shadow Neck phenomenon and achieve improved sensitivity of deflection yoke by attaching a magnetic force generating object to the space formed between the deflection yoke and cathode ray tube. CONSTITUTION: A cathode ray tube comprises an electron gun for emitting three electron beams; a screen on which the electron beams emitted from the electron gun collide and produce colors; a shadow mask for discriminating three electron beams; and a deflection yoke for deflecting the electron beams to a predetermined part of the screen. The deflection yoke includes a separator(32) and a ferrite core(34), and a Beam Shadow Neck phenomenon preventing object mounting portion(42) is formed in the area of the separator where the ferrite core is mounted. A Beam Shadow Neck phenomenon preventing object(43) is mounted in the Beam Shadow Neck phenomenon preventing object mounting portion.

Description

Deflection yoke for cathode ray tube {Deflection Yoke for CRT}

The present invention relates to a BSN (Beam Shadow Neck) improvement means of a deflection yoke for a CRT, and relates to a deflection yoke for a CRT by attaching an object that creates a magnetic force between the deflection yoke (3) and the CRT.

Typically, the CRT is an electron gun 4 that emits three electron beams as shown in FIG. 1, a screen 1 that strikes these beams to reproduce light, and a shadow mask that distinguishes the three electron beams ( 2) and a deflection yoke 3 for deflecting the electron beam to a predetermined place of the screen 1.

The deflection yoke 3 is a vertical deflection coil 31 for deflecting the electron beam emitted from the electron gun 4 inside the CRT in a horizontal direction and a vertical deflection for deflecting the electron beam in a vertical direction as shown in FIG. 2. Conical ferrite cores 34 and coils used to reduce magnetic losses generated in the deflection coil 33, the horizontal deflection coil 31, and the vertical deflection coil 33 to increase magnetic efficiency. 31, 33) and the core 34 are fixed to a predetermined position and consists of the main components such as a separator (separator 32) for insulating between the electric horizontal deflection coil 31 and the vertical deflection coil (33) have.

In addition, a convergence yoke 35 and a pair of ring-shaped permanent magnets 36 are shown in FIG. 3 to correct mis-convergence due to manufacturing errors of the deflection yoke 3 and the CRT. Similarly, it is attached to the neck of the deflection yoke 3 and used.

Referring to the operation of the prior art, the conventional deflection yoke 3 flows a current having a frequency of 15.75 kHz or more to the horizontal deflection coil 31, and uses the magnetic field generated therein to generate an electron beam inside the CRT. Is deflected in the horizontal direction, and a current having a frequency of 60 Hz is generally flowed into the vertical deflection coil 33 to deflect the electron beam in the vertical direction by using a magnetic field generated accordingly.

In addition, the self-convergence type enables three electron beams to achieve convergence on the screen even without using an additional circuit and an additional device by using a non-uniform magnetic field by the horizontal deflection coil 31 and the vertical deflection coil 33. Deflection yoke (3) is mainly developed.

In other words, by adjusting the winding distribution of the horizontal deflection coil 31 and the vertical deflection coil 33 to make a barrel or pin-cushion type magnetic field for each part (opening part, middle part, and neck part), three electron beams are positioned according to the position. Different deflection forces are experienced so that they can be collected at the same point at different distances from the starting point of the electron beam to the screen (1).

In addition, in the case of creating a magnetic field by flowing a current through the deflection coils 31 and 33, it is difficult to deflect the electron beam to the front of the screen only by the magnetic fields generated by the horizontal deflection coil 31 and the vertical deflection coil 33. 34), the magnetic field is increased by increasing the efficiency of the magnetic field by minimizing the loss on the return path of the magnetic field.

This problem of the prior art is as follows.

BSN is a phenomenon in which R and B beams, which are external electron beams, do not reach a partial region of the screen 1 by hitting the cone region of the funnel 5 and thus fail to emit phosphors. Say

The measurement of the BSN was carried out until the deflection yoke (3) was brought into close contact with the CRT as shown in Fig. 4 and pulled back, and the deflection beam was blacked on the screen (1) by hitting the cone beam of the funnel as shown in Fig. 5. The movement distance of the yoke 3 is said.

The BSN improvement method in the development of the deflection yoke (3) is to move the deflection center of the magnetic field due to the optimization of the vertical and horizontal coils from the beam trajectory of 6 to the beam trajectory of 7, that is, the screen ( The BSN has been improved by moving toward 1) or by moving the relative position of the ferrite core to the screen (1) to move the center of deflection of the magnetic field to the screen (1).

That is, as shown in FIG. 6, when the center of the deflection magnetic field is moved toward the screen 1, the beam trajectory is moved toward the screen 1, and the outer beam is hit by the funnel cone region to black. The deflection yoke 3 travel distance, i.e., BSN, until appearing is improved.

However, the screen of the deflection center due to the movement of the screen center of deflection center due to the optimization of the horizontal and vertical coils or the screen of the deflection core relative to the ferrite core screen. The shift in (screen) (1) adversely affects the sensitivity, which is the basic quality of the deflection yoke (3), and the amount of BSN improvement was insufficient.

In order to solve the above problems, the present invention is directed to a separator opening for a BSN improvement magnet of a deflection yoke or an object capable of generating a magnetic force, so that the direction from N to S is counterclockwise, that is, the magnetic force lines are counterclockwise inside the funnel. The purpose of the present invention is to provide a deflection yoke for a cathode ray tube having a deteriorated deflection angle when the BSN is improved by attaching to a magnet attachment portion to improve a deflection angle between screens.

1 is a schematic configuration diagram of a cathode ray tube.

Figure 2 is an enlarged view of the deflection yoke.

3 is a partially enlarged view of a BSN improvement object attachment portion.

4 is a diagonal view of the funnel in which the deflection yoke is in close contact with the outer surface of the funnel for measuring the BSN.

FIG. 5 illustrates the point where the beam hits the cone of the funnel while the deflection yoke is moved toward the electron gun for the measurement of the BSN, resulting in the BSN.

FIG. 6 shows beam trajectories before and after improvement in a state where the deflection yoke is in close contact with the outer surface of the funnel to move the screen side of the center of the deflection magnetic field, which is a conventional BSN improvement method.

Figure 7 is an embodiment showing the main configuration of the deflection yoke according to the present invention.

FIG. 8 illustrates a portion A of FIG. 7 showing beam trajectories before and after attaching a funnel cone portion to an object capable of generating a magnet or a magnetic force for improving BSN.

FIG. 9 illustrates part B of FIG. 7 to attach a magnet or an object capable of generating a magnetic force to improve the BSN, and then to attach the magnet or the magnetic force to correct the deteriorated deflection angle. This shows the beam trajectory before and after attaching a magnet or an object that can generate a magnetic force between them.

* Explanation of symbols for the main parts of the drawings

1: screen (screen) 2: shadow mask

3: deflection yoke 4: electron gun

5: FUNNEL 6: Trajectory of beam before BSN improvement

7: Trajectory of beam with deflection center shifted to screen by optimization of deflection coil or by screen-side movement of relative position of ferrite core

8: Trajectory of Beam Corrected BSN Improvement and Deflection Angle According to the Present Invention

9: Trajectory of beam before BSN according to the present invention is improved and deflection angle is corrected

31: horizontal deflection coil 32: separator

33: vertical deflection coil 34: core

35: Convergence York 36: CPM

37: Top / bottom correction magnet 38: neck flange

39: separator opening 40: deflection angle improvement object attachment portion

41: deflection angle improvement object 42: BSN improvement object attachment portion

43: BSN improvement object

In order to achieve the above object, in the present invention, an electron gun emitting three electron beams and an electron beam emitted from the electron gun collide with each other to produce a light and a shadow mask for distinguishing the three electron beams from the screen. In a CRT composed of a deflection yoke for deflecting to a predetermined place, the deflection yoke includes a separator and a ferrite core, and a BSN improvement object attachment portion is formed in an area in which the ferrite core is installed, and the BSN improvement object attachment portion is provided. Magnetic material is characterized in that it is installed.

In addition, the magnetic force line direction of the magnetic material is installed so as to be clockwise in the interior of the funnel, the BSN improved object attachment portion is characterized in that the engraved form.

And a deflection angle improvement object attachment portion between the separator opening portion and the screen, wherein the deflection angle improvement object attachment portion extends from the deflection yoke opening toward the outer portion of the funnel.

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

Figure 7 is an embodiment showing the main configuration of the deflection yoke according to the present invention, Figure 8 is a view of the portion A of Figure 7 before attaching a funnel cone portion to the object that can create a magnet or magnetic force for BSN improvement 9 shows the beam trajectory of FIG. 7, and FIG. 9 shows part B of FIG. 7 to attach a magnet or an object capable of generating a magnetic force to improve the BSN, and then to fix the deteriorated deflection angle. It shows the beam trajectory before and after attaching a magnet or an object that can generate magnetic force between the object and the screen that can generate magnetic force.

According to the present invention, an object capable of generating a magnetic force, such as a magnet or a coil, between the deflection yoke 3 and the CRT in a portion where the beam strikes the cone of the funnel 5, N to S The BSN is attached by attaching the BSN-enhanced object attachment portion 42 between the separator 32 and the vertical deflection coil in whole or in part so that the clockwise direction or the magnetic force line direction is clockwise inside the funnel 5. When the deflection angle deteriorated by the above-described BSN improvement magnet, or an object capable of generating a magnetic force, the magnet, or an object capable of generating a magnetic force, the direction from N to S is counterclockwise. That is, the deflection angle between the separator opening 39 and the screen is attached to the magnet attachment portion so that the magnetic force lines are generated counterclockwise in the funnel 5, thereby deteriorating the deflection angle when the BSN is improved. One deflection yoke 3 is provided.

As described above, in the development of the deflection yoke, the BSN is first separated between the separate deflection coil and the vertical deflection coil in order to drastically improve the BSN, which is the basic quality of the deflection yoke 3, and to reduce or eliminate the adverse effect of the sensitivity appearing when the BSN is improved. The N to S direction is clockwise, i.e., the direction of the magnetic force line, for the improvement of the BSN in the whole or beam hitting the cone part of the funnel. Attach magnets or objects that can generate magnetic force so that they are clockwise inside.

The above-described BSN improvement magnet (Magent), or the deteriorated deflection angle by the magnet that can generate a magnetic force (Magent), or the object that can create a magnetic force N to S direction counterclockwise, that is, funnel (5) Improving deflection angle between separator opening 39 and screen so that magnetic force lines are generated counterclockwise inside. Deteriorated deflection when improving BSN by attaching on whole or BSN improved beam trajectory to magnet attachment part It is based on securing the deflection yoke 3 having an angle.

In the present invention as described above, the deflection center screen (Screen) due to the optimization of the coil (Coil) of the conventional method for the improvement of the BSN which is the basic quality of the deflection yoke (3) during the development of the deflection yoke (3) ( 1) Overcoming the deterioration of sensitivity and micro improvement that occurs when moving the part or moving the relative position of the ferrite core to the screen (1) to move the deflection center toward the screen (1) For example, as shown in FIG. 7, beams collide with the cone of the funnel 5, and as shown in FIG. 8, an object capable of generating a magnetic force, such as a magnet or a coil, may be N. In the S direction is clockwise, that is, the whole or beam is directed to the BSN-improved object attachment portion 42 between the separator 32 and the vertical deflection coil so that the direction of the magnetic force line is clockwise inside the funnel 5. Attached to the part hitting the cone part of the funnel All.

Then, as shown in FIG. 8, the beam 6 hitting the cone portion of the funnel 5 receives the beam by the magnetic force of the magnet or an object that can generate a magnetic force. ) Is moved to the center of the funnel (5) as the beam (6) that has hit the funnel (5) under the force pushed toward the center of the funnel (5) moves toward the center of the funnel (5). The BSN is improved by making a beam trajectory, such as 9, that does not hit the cone of the funnel 5.

In order to compensate for the deflection angle deteriorated by an attached magnet for improving the BSN or an object capable of generating a magnetic force, the direction from N to S is counterclockwise, that is, the funnel ( 5) Improving the deflection angle between the separator opening 39 and the screen to improve the magnet or magnetic force so that the direction of the magnetic force line is counterclockwise. Partially attached to the beam trajectory.

Then, as shown in FIG. 9, the beam 9 receives a magnetic force of a magnet or an object capable of generating a magnetic force, and the beam is pulled toward the funnel 5 so that the beam Compensates for the deterioration of the deflection angle by drawing a beam trajectory such as (8) by a magnet or an object capable of generating a magnetic force.

Thus, deflection due to the movement of the screen (1) portion of the center of the deflection field due to the optimization of horizontal and vertical coils or the movement of the screen (1) portion of the relative position of the ferrite core It is possible to simultaneously overcome the adverse effect of the sensitivity and the small amount of the improvement that appear when the BSN is improved due to the movement of the screen 1 in the center of the magnetic field.

The present invention solves the deflection of the deflection yoke (3) by solving the deterioration of the sensitivity and the deficiency of the BSN improvement, which is the basic quality of the deflection yoke, which appears in the improvement of the BSN, which is the basic quality of the deflection yoke (3), during the development of the deflection yoke (3). Simultaneous improvement of the basic quality BSN and sensitivity is possible.

Claims (6)

The electron gun 4 emitting three electron beams and the electron beam emitted from the electron gun 4 hit the screen 1 to reproduce light, and the shadow mask 2 separating the three electron beams and the electron beam. In a CRT composed of a deflection yoke 3 or the like which deflects to a predetermined place of a screen 1, The deflection yoke 3 includes a separator 32 and a ferrite core 34. A BSN improvement object attaching portion 42 is formed in an area in which the ferrite core 34 is installed, and the BSN improvement is performed. A deflection yoke for a cathode ray tube, characterized in that a BSN-improved object (43), which is a magnetic body, is installed at the object attachment part (42). The method of claim 1, The deflection yoke for cathode ray tubes, characterized in that the magnetic force line direction of the BSN-improved object (43), which is the magnetic body, is installed clockwise in the funnel (5). The method of claim 1, The BSN improved object attachment portion 42 is a deflection yoke for the cathode ray tube, characterized in that the engraved form. The method of claim 1, Deflection yoke for a cathode ray tube, characterized in that it comprises a deflection angle improving object attachment portion (40) between the separator opening (39) and the screen (1). The method of claim 4, wherein The deflection angle improving object attachment portion 40 is a deflection yoke for the cathode ray tube, characterized in that is installed extending in the direction of the outer portion of the funnel (5) in the deflection yoke opening. The method of claim 4, wherein The deflection yoke of the cathode ray tube, characterized in that the direction of the magnetic force line of the object to improve the deflection angle is installed clockwise in the interior of the funnel.