JPH1092337A - Convergence correction device for color television - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate improvement in distortion of electron beams and adjustment of convergence and device designing and manufacturing by enabling a mounting position of a convergence correction coil to be moved horizontally and vertically. SOLUTION: With a neck part being a center, top coils 64a and 64b are loaded on a L-shaped loading part 66 formed at a pair of support parts 65a and 65b provided in parallel to an X-axis direction, both leg parts of the top coils are pinched by adjustment screws 67a and 67b, and the top coils 64 is made movable in the X-axis direction by rotatably moving the adjustment screws 67a and 67b in the reverse direction. When the top coil 64 is moved in a Y-axis direction, a rectangular gap spacer is inserted between a support part 68 or 70 and the top coil 64, and adjustment of intervals at a neck part is performed by varying only a thickness of the spacer. Thereby, a convergence correction device is capable of being freely adjusted horizontally and vertically relevant to a cathode-ray tube, and it is possible to improve deviation or distortion of three original color beams by design or manufacturing errors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift of three electron beams caused by a difference in distance between an electron beam radiated from an electron gun and a central portion of a color cathode ray tube and a peripheral portion thereof. The present invention relates to a convergence correction device that corrects convergence.

[0002]

2. Description of the Related Art At present, a cathode ray tube used in a color television receiver and a display device for a computer has three electron guns for generating electron beams corresponding to three primary colors arranged in a horizontal direction (hereinafter referred to as an in-line arrangement). On the phosphor screen, phosphors corresponding to the three primary colors are applied in a stripe pattern in the vertical direction, and the electron beam generated from the three electron guns is applied to the phosphor screen through a shadow mask provided with strip-shaped slits. Light emitting structures are widely used.

In the cathode ray tube of this in-line arrangement, a neck portion and a cone portion through which the electron beam emitted from the electron gun of the cathode ray tube passes so that the electron beam emitted from the electron gun is sequentially irradiated on the entire phosphor screen. A deflection coil is attached to the scanner to apply a deflection magnetic field in the horizontal and vertical directions to deflect the electron beam vertically and horizontally. At this time, due to the difference between the distance from the electron gun to the center of the phosphor screen and the distance from the electron gun to the periphery, especially in the periphery,
The electron beams emitted from the three primary color electron guns do not accurately irradiate the phosphor of a predetermined color, and convergence tends to be shifted. For this purpose, a convergence correction current synchronized with the deflection current supplied to the deflection coil is supplied to a convergence correction device to correct the irradiation of the phosphor by changing the deflection of the electron beam.

The specific structure of the convergence correction device will be described with reference to FIG. This figure is a perspective view showing a deflection coil device 1 and a convergence device 2,
The deflection coil device 1 is attached and fixed to a cone portion 4 of a cathode ray tube 3 and a neck portion 5 having a built-in electron gun (not shown). In this deflection coil device 1, a pair of toroidally wound vertical deflection coils 12 are wound around a pair of trumpet-shaped ferromagnetic cores 11. The ferromagnetic core 11 around which the vertical deflection coil 12 is wound is fixedly mounted on a funnel-shaped insulating spacer 13 to deflect the electron beam from the electron gun in the vertical direction. A pair of saddle-wound horizontal coil devices (not shown) are mounted and fixed inside the insulating spacer 13 at a portion in contact with the cone portion 4 and the neck portion 5 of the cathode ray tube 3 to deflect the electron beam in the horizontal direction. The insulating spacer 13 on the side of the neck portion 5 of the cathode ray tube 3 of the deflection coil device 1 thus configured.
An insulating substrate 14 is provided, which is formed integrally with or separately formed and then attached. The convergence device 2 is attached to the insulating substrate 14. The convergence device 2 has top coils 15a and 15b in which a pair of coils are wound around both legs of a pair of U-shaped ferromagnetic cores. , The top coils 15a, 15
b, the openings of the U-shaped core are opposed to each other in the X-axis direction in the figure so as to sandwich the net portion 5 of the cathode ray tube 3, and are fixed by the claw portions 16a to 16h planted from the insulating substrate 14. ing.

Depending on the characteristics of the deviation of the convergence and the distortion of the deflection, the convergence device 2 may have a U-shaped ferromagnetic core sandwiching the neck portion 5 as shown in FIG. Are arranged in the Y-axis direction, and the top coils 17a and 17b having coils wound on opposite sides of both cores orthogonal to the Y-axis direction are provided on the claw portions 1 of the insulating substrate 14.
It may be attached and fixed at 8a to 18d.

In the convergence device 2 configured as described above, each coma coil 15a, 15b or 17
A and 17b are supplied with a convergence correction current synchronized with the deflection current supplied to the deflection coil device 1 to deflect the electron beams emitted from the three primary color guns of red R, green G and blue B. Then, the color misregistration and distortion of each of the three primary colors in the peripheral portion of the screen are corrected. However, due to variations in the design, manufacture, and characteristics of the cathode ray tube 3 and the deflection coil device 1, there are cases where the convergence correction current alone cannot solve the problem. . In this case, the displacement or distortion of the three primary colors can be easily corrected and eliminated by moving any of the top coils 15a, 15b or 17a, 17b in the X and Y axis directions.
15b, or 17a, 17b is a claw portion 17a to 17h
Or 18a to 18d, so that the movement cannot be adjusted in any direction of the X or Y axis. Even if the movement is adjusted in the case of the structure of FIG. There is a problem that readjustment cannot be performed.

[0007]

As described above, in the conventional convergence correction device, when the convergence correction cannot be performed only by the correction magnetic field generated by the convergence correction current, the pair of coma coils of the convergence correction device are mounted in the horizontal or vertical direction. Convergence correction can be realized by moving
It is a mounting structure that cannot move the top coil, and it is necessary to pay close attention to the design and manufacture of the cathode ray tube, the deflection coil device and the convergence device, and furthermore, it takes much time to adjust the convergence correction. there were.

[0008]

According to the present invention, a pair of coma coils for convergence correction have a mounting structure movable in the X-axis and Y-axis directions, and a screw-shaped fixing device for holding both leg sides of both coma coils is provided. Movement in the X-axis direction
By performing the movement in the Y-axis direction by inserting a spacer,
Provided is a convergence correction device for a color cathode ray tube, which can easily and surely correct a mounting position of a coma coil.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a convergence correction device according to the present invention. This figure omits the deflection coil device and shows only the convergence correction device.

As shown in FIG. 5, a pair of U-shaped stiffeners in the Y-axis direction centered on the CRT neck 5 behind the deflection coil device mounted on the cone and neck of the CRT. Cores 62 a and 62 b made of a magnetic material are arranged, and the openings of the cores 62 a and 62 b are directed toward the neck 5. A coma coil 64a in which the convergence correction coils 63a and 63b are wound on sides of the cores 62a and 62b facing each other and orthogonal to the Y-axis direction,
64b are formed. The top coils 64a, 64
In order to support b, a pair of first and second substrates, which are planted from an insulating substrate (not shown) fixed to an insulating spacer of the deflection coil device and provided in parallel with the X-axis method in FIG. One support portion 65a, 65b is formed.
The first support portions 65a and 65b are formed with L-shaped section coil placement sections 66a and 66b, and are provided with the top coils 6 placed on the top coil placement sections 66a and 66b.
Adjusting screws 67a, 67 for holding both legs 4a, 64b
b is provided through the first support portions 65a and 65b. Further, a pair of second support portions 68a, 68b that support the outside of the coma coils 64a, 64b are formed from the insulating substrate in parallel with the X-axis direction with the neck portion 5 as a center. Support portions 68a, 68b
Are provided with a coma coil mounting portion 69a, 69b having an L-shaped cross section. Further, a pair of third support portions 70a and 70b for supporting the inside of the coma coils 64a and 64b are formed by being erected from the insulating substrate.
A coma coil mounting portion (not shown) having an L-shaped cross section similar to the coma coil mounting portions 69a and 69b of the second support portions 65a and 65b is provided also at 70b.

The first support portions 65a and 65b will be described in more detail with reference to the enlarged front view of FIG. FIG. 2 is a view as seen from the direction of arrow A in FIG. 1.
After placing the top coil 64b on the a and 66b, the adjusting screw 67
a, 67b, and adjusting screws 67a, 67b
Are rotated in opposite directions, so that the coma coil 64b can be moved in the X-axis direction. Next, the second
The details of the third support portions 68a and 70a will be described with reference to FIG. FIG. 3 is a partial cross-sectional view taken in the direction of arrow B in FIG. 1. A coma coil 64b is placed between the second and third support portions 68a and 70a.
When approaching the neck portion 5 in the axial direction, a substantially rectangular gap space 71 is inserted between the second support portion 68a and the coma coil 64b. The gap coil 71 enables the top coil 64b to move in the Y-axis direction in the direction approaching the neck 5, and when the gap spacer 71 'is inserted between the third support portion 70a and the top coil 64b, the top coil 64b moves in the Y-axis direction. Can be moved in a direction away from the neck portion 5. That is, a slight space is provided between the second and third support portions 68a, 70a and the coma coil 64b, and the gap spacers 71, 71 'filling this space are provided.
By preparing several types having different thicknesses, it is possible to easily adjust the moving distance in the Y-axis direction by combining the thicknesses. Also, the material of one of the second or third support portions 68a and 70a is made of an elastic material, or the thickness of the material is reduced, and the support portion is slightly distorted using the elastic force of the material. Instead, the gap coil can be moved by inserting a gap spacer between the other support portion and the top coil.

That is, when adjusting the movement of the top coils 64a and 64b, the adjusting screws 67a and 67
7b, and can be realized by changing the thickness of the gap spacers 70, 70 'in the Y-axis direction.

In the convergence device having such a top coil mounting structure, the top coil 64a,
When a correction current is supplied from a convergence correction current supply source (not shown) to the head 64b to generate a pincushion-type magnetic field, the magnetic fields generated from the coma coils 64a and 64b and the three electron guns R and G in the neck portion 5 , B will be described with reference to FIG.

FIG. 4A shows a red R, green G, and red B electron guns arranged in-line in the neck portion 5 as shown in FIG. With respect to the electron guns R, G, and B, the coma coils 64 are arranged at equal intervals in the X and Y axis directions, which are initial set values.
a, 64b are arranged, that is, the distances t1, t2, t3, t4 between the neck portion 5 and the coma coils 64a, 64b.
Are made equal (t1 = t2 = t3 = t4), the two coil coils 64a and 64b are moved toward the neck portion 5 while maintaining the state of t1 = t2 = t3 = t4 (in the direction indicated by the arrow in the figure). ) And the intensity of the magnetic field received by each of the electron beams R, G, B increases. At this time, the movement of the electron beam on the phosphor screen of the cathode ray tube shown in FIG.
The electron beams of blue R and blue B receive a smaller magnetic force than the green G electron beam due to the large magnetic force of the vertical deflection component (Y-axis direction) due to the pincushion-type magnetic field from the a and 64b.
Further, since the horizontal deflection components (X-axis direction) received by the red R and blue B electron beams are different, the red R and blue B electron beams show different changes in the X-axis direction in the drawing.

Next, as shown in FIG. 4 (b.a), the top coil 64a is arranged at a position (t1 = t2) away from the neck portion 5 in the Y-axis direction.
b is closer to the neck portion 5 in the Y-axis direction (however, t3 =
t4) Assuming the arrangement state, that is, the state of t1 = t2> t3 = t4, the green G electron beam is above the phosphor screen.
The vertical deflection components (Y
(In the axial direction), the green G electron beam receives a stronger magnetic force than the red R and blue B electron beams below the phosphor screen, and changes as shown in FIG. .
Further, in the upper part of the fluorescent screen, the intensity of the magnetic force from the coma coil 64a decreases, and in the lower part of the fluorescent screen, the magnetic force from the coma coil 64b increases, so that the blue R and blue B electron beams change in the X-axis direction. .

Next, as shown in FIG.
When the coma coils 64a and 64b are moved in the X-axis direction and the relation between the electron beams R, G and B is set to t1 = t3> t2 = t4, the green G and blue B electrons are located at the upper and lower portions of the phosphor screen. When the beam receives a strong magnetic force in the vertical direction (Y-axis direction), the beam changes as shown in FIG.

As described above, the top coils 64a,
64b in the X-axis direction, the adjusting screw 67
By rotating a and 67b in directions different from each other,
If you can easily adjust the position and move it in the Y-axis direction,
By changing the thickness of the gap spacer 71, the position can be adjusted. By combining the movements of the coma coils 64a and 64b, the optimal positioning of the electron beams R, G, and B of the three primary colors can be performed.

In the above description, the coma coil 64a,
64b, a pair of U-shaped ferromagnetic cores 6
The coils 63a, 63b
b, the coil may be divided and wound on both legs 62a and 62b of the U-shaped core. In this case, the adjusting screws of the first support portions 65a and 65b may be used. 6
The insulation can be easily handled by inserting an insulating spacer so that the insulation of the coil on the surface where the top coils 7a, 67b and the top coils 64a, 64b are in contact with each other is not broken by the adjustment screws 67a, 67b. The shape of the ferromagnetic core may be an E-shape other than a U-shape. Further, in the above description, the mounting structure or the position movement adjustment of one of the coma coils is described, but these mounting structures are completely left-right symmetric, and it is clear that the mounting position adjustment performs the same operation. It is. Furthermore, although the convergence correction magnetic field is described as a pincushion type, the barrel-type magnetic field and the mounting position with respect to the deflection coil device or the in-line beam may be changed according to the characteristics of the CRT and the deflection coil device. Obviously, it can be changed according to.

[0019]

As described above, by using the convergence correction device of the present invention, the mounting position of the CRT can be freely adjusted in the horizontal and vertical directions.
It is possible to provide a convergence correction device for a color television that can easily improve the deviation and distortion of the electron beams of the three primary colors caused by errors in the design and manufacture of the cathode ray tube and the deflection coil device, and can easily adjust the convergence correction.

(Described for each claim)

[Brief description of the drawings]

FIG. 1 is a perspective view of a convergence device for a color television according to the present invention.

FIG. 2 is a front view showing a configuration of a first support portion of the convergence device for a color television according to the present invention, as viewed from a direction of an arrow A in FIG.

FIG. 3 is a partial cross-sectional view showing the configuration of second and third support portions of the convergence device for a color television according to the present invention, as viewed from the direction of arrow B in FIG.

FIG. 4 is a diagram showing the effect of three primary color electron beams due to a magnetic field provided by the color television convergence device according to the present invention.

FIG. 5 is a perspective view showing a configuration of a conventional deflection coil device and a convergence device for a color television.

FIG. 6 is a perspective view showing another configuration of a conventional convergence device for a color television.

[Explanation of symbols]

 62a, 62b: U-shaped ferromagnetic pair core; 63a, 63b: coil; 64a, 64b: coma coil; 65a, 65b: first support portion; 67a, 67b: adjusting screw; Part, 70a, 70b ... third support part, 71, 71 '... gap spacer.

Claims (3)

[Claims] 1. A CRT in which electron guns for emitting electron beams of three primary colors are arranged in-line, deflection coil means for deflecting the electron beam, and convergence for correcting a deviation of the electron beam deflected by the deflection coil means around the CRT. A color television deflection device having a correction coil, wherein the convergence correction means is mounted near the deflection coil means and has a pair of ferromagnetic cores wound with a coil for generating a magnetic field; A color television comprising: a pair of first support means for holding an axially movable adjustment; and a pair of second support means for holding the coma coil so as to be adjustable in a Y-axis direction. Convergence correction device. 2. The pair of first support means includes: a first support portion for holding a leg side of the coma coil; and an L-shaped cross section on which both leg sides of the coma coil are mounted on the first support portion. And a pair of adjustment screws for holding the coma coil placed in the notch. The pair of adjustment screws are rotated in opposite directions to set the mounting position of the coma coil at X. 2. The convergence correction device for a television according to claim 1, wherein the movement can be adjusted in the axial direction. 3. The pair of second support means includes second and third support portions for holding a main body of the coma coil, and opposite sides of the coma coil formed on the second and third support portions. And a notch having an L-shaped cross section on which is mounted, and a coma coil, which is placed in the notch and sandwiches the coma coil between the second and third support portions, and the second and third supports And a gap spacer having a predetermined thickness inserted between the top and bottom of the top coil, and by selecting the thickness of the gap spacer, the mounting position of the top coil can be moved and adjusted in the Y-axis direction. The convergence correction device for a television according to claim 1, wherein: