JP2000113831A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke capable of correcting the mis-convergence of XH in-in, out-out patterns and XV cross pattern with a low-cost correcting means. SOLUTION: This deflection yoke is provided with a holding jig 1 holding the opening section side of a main magnetic core and capable of moving it in the X-axis direction and Y-axis direction, and supports 2a, 2b having screw grooves in the X-axis direction and Y-axis direction are formed on the holding jig 1. A holder 3 holding the holding jig 1 is provided on the opening end of the deflection yoke, and main magnetic core axis adjusting tabs 5 fixed to the holder 3 are screwed to the supports 2a, 2b. When the main magnetic core axis adjusting tabs 5 are merely rotated, the central axis of a main magnetic core 6 is adjusted, and mis-convergence can be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke provided in a cathode ray tube, and more particularly, to a color cathode ray tube having three electron guns arranged in-line or in a delta type in a color display device, and a deflection yoke. The present invention relates to a deflection yoke that corrects a convergence shift that occurs when a combination is used.

[0002]

2. Description of the Related Art When a cathode ray tube having three electron guns used for a color TV receiver, a color monitor and the like is combined with a deflection yoke, a mechanical deviation of the electron gun, a deviation of the magnetic field of the deflection yoke, and the like are caused. As a result, misconvergence (XH inside / outside pattern, XV cross pattern) occurs.

As a means for correcting the misconvergence, the deflection yoke is adjusted with respect to the cathode ray tube, and then a magnetic piece such as a ferrite core, an iron piece, a silicon steel plate, or a permalloy is placed on either side of the neck of the deflection yoke. There are things to attach. Alternatively, a mechanism for adjusting and correcting the magnetic field strength between a pair of horizontal coils by a differential coil is also common.

FIG. 6 shows an extra-XH blue pattern generated when a cathode ray tube and a deflection yoke are combined. FIG. 7 shows a relative displacement between the electron beam and the horizontal deflection magnetic field at this time.
FIG. 8 shows the same XV cross pattern, and FIG. 9 shows the relative displacement between the electron beam and the horizontal deflection magnetic field at this time. In the figure,
R, G, and B represent red, green, and blue, respectively.

[0005]

Among the prior arts described above, in the case of performing adjustment (adjustment of the XH inner and outer patterns) by attaching a magnetic piece to either the left or right of the neck portion of the deflection yoke, It also affects convergence other than the target misconvergence, beam landing, and the like.

Further, the method of adjusting and correcting the magnetic field strength between a pair of horizontal coils using a differential coil (adjustment of the XV cross pattern) has a problem that the deflection sensitivity of the horizontal deflection coil is deteriorated and the component cost is increased.

The present invention provides a deflection yoke capable of correcting misconvergence of a putter inside and outside the XH, an XV cross pattern, etc. by a low-cost correcting means without affecting the performance other than the intended purpose. The purpose is to:

[0008]

In order to achieve the above object, the first means is that a deflection yoke mounted on a cathode ray tube and composed of a horizontal deflection coil, a vertical deflection coil, a main magnetic core, and the like is provided. A main magnetic core adjusting means for adjusting the center axis of the core with respect to the horizontal deflection coil and the vertical deflection coil is provided.

In order to achieve the above object, the second means is the first means, wherein the main magnetic core adjusting means holds the opening side of the main magnetic core, and the main magnetic core adjusting means holds the main magnetic core in the X-axis direction and the Y-axis direction. The holding jig is configured to be movable.

In order to achieve the above object, a third means is the second means, wherein the holding jig forms a column having screw grooves in the X-axis direction and the Y-axis direction, and A holder for holding the holding jig is provided at an open end, and a main magnetic core shaft adjusting knob fixed to the holder is screwed to the column.

As described above, the XH inner / outer putter and XV cross pattern are generated by the relative displacement between the center of the mechanical arrangement of the electron gun and the center of the magnetic field of the deflection yoke. The main magnetic core attached outside the horizontal deflection coil and the vertical deflection coil functions to amplify the magnetic field generated by these deflection coils and increase the deflection efficiency.

That is, since the magnetic field distribution of the deflecting magnetic field is governed by the mounting position of the main magnetic core, if the structure of the main magnetic core can be adjusted with respect to the molded body holding the deflecting coil. While the deflection yoke is fixed to the cathode ray tube, it is possible to correct misconvergence such as an XH inner / outer putter and an XV cross pattern.

At this time, since the magnetic field intensity itself generated by the deflection coil does not change, there is no influence on characteristics other than misconvergence caused by axis deviation.

Further, when adjusting the axis of the main magnetic core,
By providing an easily operable holding jig, ITC
Work efficiency can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a main magnetic core holding jig 1 according to an embodiment of the present invention. 2A and 2B are configuration diagrams of the holder 3 on the receiving side of the main magnetic core holding jig 1 shown in FIG. 1, wherein FIG. 2A is a front view and FIG. 2B is a side view. 3A and 3B are configuration diagrams of the knob 5 for adjusting the main magnetic core axis. FIG. 3A is a front view, and FIG. 3B is a side view (provided that the “front” of the holder 3 and the “side” of the knob 5 are in the same direction). is there. FIG. 4 is a structural view of the deflection yoke according to the present invention, and FIG.

The deflection yoke includes a main magnetic core 6 shown in FIG.
A vertical deflection coil 7, a molded body 8, and a horizontal deflection coil 9 shown in FIG. 5 are provided.

After the main magnetic core 6 is assembled in the deflection yoke, the opening side is held by the holding jig 1 in FIG. 1, and the holding jig 1 is attached to the opening end of the deflection yoke in FIG. Is held by the holder 3. As shown in FIG. 1, the holding jig 1 has columns 2a and 2b for axis adjustment extending in each of the X-axis direction and the Y-axis direction, and taps are cut in a specific range of the columns 2a and 2b. The screw is engaged with the main magnetic core axis adjusting knob 5 in FIG. 3 and is guided in the X and Y directions by the main magnetic core axis adjusting knob 5.

At this time, since the position of the main magnetic core shaft adjusting knob 5 is fixed by the arm 4 of the receiving side holder 3 shown in FIG. 5, the adjusting knob 5 of each of the columns 2a and 2b of the holding jig 1 is fixed. The holding jig 1 moves in the X-axis direction and the Y-axis direction by arbitrarily operating. As a result, the center axis of the main magnetic core 6 whose opening is held by the holding jig 1 changes with respect to the molded body 8 and the deflection coils 7 and 9 with the fulcrum near the neck.

By performing the above operation while comparing the convergence pattern with the convergence pattern, it is possible to correct misconvergence such as an XH internal / external putter or an XV cross pattern.

As described above, the deflection yoke of this embodiment is
A holding jig 1 that holds the opening side of the main magnetic core and is movable in the X-axis direction and the Y-axis direction is provided. The holding jig 1 has a column 2a having screw grooves in the X-axis direction and the Y-axis direction. , 2b, a holder 3 for holding the holding jig 1 is provided at the opening end of the deflection yoke, and a main magnetic core shaft adjusting knob 5 fixed to the holder 3 is screwed to the columns 2a, 2b. With this configuration, it is possible to easily adjust the center axis of the main magnetic core 6 by simply turning the main magnetic core axis adjusting knob 5 to correct misconvergence.

[0021]

According to the first aspect of the invention, the central axis of the main magnetic core has a structure that can be freely adjusted with respect to the horizontal deflection coil and the vertical deflection coil, so that the XH internal and external putters and XVs can be used. The cross pattern can be adjusted.

According to the second and third aspects of the present invention, by providing the holding jig for adjusting the center axis of the main magnetic core, the XH inner / outer putter and XV cross pattern adjustment work is performed. Can be easily performed, and the productivity of the deflection yoke and the efficiency of the ITC operation can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main magnetic core holding jig according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a holder on a receiving side of the main magnetic core holding jig shown in FIG. 1;

FIG. 3 is a configuration diagram of a main magnetic core shaft adjusting knob.

FIG. 4 is a configuration diagram of a deflection yoke according to the present invention.

FIG. 5 is a sectional view taken along line AA ′ of FIG. 4;

FIG. 6 is a diagram showing inside and outside patterns of misconvergence XH on a screen.

FIG. 7 is a diagram illustrating a relative shift between an electron beam and a vertical deflection magnetic field when a pattern inside and outside misconvergence XH is generated on a screen.

FIG. 8 is a diagram showing a misconvergence XV cross pattern on a screen.

FIG. 9 is a diagram showing a relative shift between an electron beam and a vertical deflection magnetic field when a misconvergence XV cross pattern on a screen occurs.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main magnetic core holding jig 2a, 2b Axis adjustment support column 3 Receiving holder 4 Arm 5 Main magnetic core axis adjustment knob 6 Main magnetic core 7 Vertical deflection coil 8 Molded body 9 Horizontal deflection coil

Claims (3)

[Claims] 1. A horizontal deflection coil mounted on a cathode ray tube,
A deflection yoke comprising a vertical deflection coil, a main magnetic core, and the like, characterized by comprising a main magnetic core adjusting means for adjusting a center axis of the main magnetic core with respect to a horizontal deflection coil and a vertical deflection coil. Deflection yoke. 2. The main magnetic core adjusting means according to claim 1, wherein the main magnetic core adjusting means is configured by a holding jig which holds an opening side of the main magnetic core and is movable in an X-axis direction and a Y-axis direction. A deflection yoke. 3. The holding jig according to claim 2, wherein the holding jig forms a column having screw grooves in the X-axis direction and the Y-axis direction, and a holder for holding the holding jig is provided at an open end of the deflection yoke. A deflection yoke, wherein a knob for adjusting a main magnetic core axis fixed to the holder is screwed to the support.