JP2002237264A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost and plane cathode ray tube device having a flattened cathode-ray tube realized by using a deflection corrector consisting of a panel with a flat outer face, a shadow mask having a smaller radius of curvature and two sets of quadrupole coils, allowing a high-definition color image to be reproduced by providing a static convergence adjusting magnet assembly on the outer periphery of the first quadrupole coil. SOLUTION: A static convergence adjusting magnet formed of a plurality of ring magnets each having at least two, four or six magnetic poles is provided on the outer peripheries of four looped coils constituting the first quadrupole coil provided on a neck portion of the cathode-ray tube device, thereby enabling static convergence adjustment without increasing the total length of the cathode ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inline sequence of 3
The present invention relates to a color cathode ray tube apparatus using the electron gun, in particular, by making the outer surface of the fluorescent screen panel substantially flat and mounting a shadow mask having a large curvature to the flat panel, thereby reducing the cost, increasing the productivity, and increasing the productivity. The present invention relates to a flat cathode ray tube device capable of reproducing a high-quality color image.

[0002]

2. Description of the Related Art In recent cathode ray tube devices, there is an increasing demand for flattening an outer surface of a panel which is an image display surface. But,
With the flattening of the outer surface of the panel, the shadow mask is flattened, and the holding strength of the shadow mask shape is significantly reduced.
There is a problem that the reproduced image quality such as color purity is deteriorated.
As a technique for improving the holding strength of the shadow mask shape, as described in Japanese Patent Application Publication No. Hei 10-508428, the curvature of the shadow mask is made larger than that of the outer surface of the panel to improve the holding strength of the shadow mask shape. And a quadrupole from the second correcting and deflecting device, in which a quadrupole magnetic field from the correcting and deflecting device acts on the electron beam at the neck of the cathode ray tube to vary the distance between the center beam and the side beam. It is disclosed that a color image can be reproduced by adjusting convergence by applying a magnetic field. That is, as shown in FIG. 8, the correction magnetic fields from the first correction deflection device 15 disposed at the rear end of the deflection yoke and the second correction deflection device 16 provided on the core 14 of the deflection yoke 10 are applied to the electronic device. The configuration was such that a color image was reproduced by acting on the beam.

[0003]

However, the above prior art does not disclose a technique relating to static convergence adjustment. When a deflection yoke is mounted on a cathode ray tube, a magnet assembly for static convergence adjustment is mounted on an electron gun of the deflection yoke. It is not possible to secure a space to be attached to the side neck tube portion, which causes a problem that a high-quality color image cannot be reproduced. Further, if the neck tube of the cathode ray tube is lengthened so that the static convergence adjusting magnet assembly can be attached, the total length of the cathode ray tube increases, and the degree of freedom of the installation place decreases because the cathode ray tube display device becomes large. It creates problems.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to combine a substantially flat panel with a shadow mask which has a large curvature as compared with the flat panel and has less strength deterioration.
In a cathode ray tube device that improves landing latitude and convergence performance by applying two quadrupole magnetic fields to the electron beam, static convergence can be adjusted without increasing the total length of the cathode ray tube, and the quality of reproduced images is greatly improved. It provides the technology to make it work.

[0005]

Means for Solving the Problems In order to solve the above problems,
The present invention has the following configuration.

A static convergence adjusting magnet comprising a plurality of ring-shaped magnets having at least two, four, or six magnetic poles on the outer periphery of four loop-shaped coils constituting a first quadrupole coil is provided. A configuration is provided.

The angle between the center of the loop coil and the horizontal axis is 35 to 55 °, 125 to 145 ° in the counterclockwise direction, respectively.
The range is 215 to 235 ° and 305 to 325 °.

Further, the second 4 provided on the magnetic core portion is provided.
The coils for generating the dipole magnetic field are composed of toroidal winding coils at four places of the magnetic material core, and the angle between the center of the coil and the horizontal axis is -10 to 10 degrees and 80 to 100 degrees in the counterclockwise direction, respectively.
°, 170 to 190 °, 260 to 280 °, or a loop-shaped coil arranged at four points inside the magnetic core, and the angle between the center of the coil and the horizontal axis is opposite. 35-55 °, 125-145 °, 215-235 °, 305 clockwise
325 °.

[0009] Further, a drive circuit capable of supplying a correction current of a vertical deflection cycle (for example, a substantially parabolic shape) or a correction current of a horizontal deflection cycle to the first and second quadrupole coils is provided. .

The outer surface of the panel is substantially flat, and the shadow mask has a larger curvature than that of the substantially flat panel.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a main part of a cathode ray tube to which a first embodiment of the present invention is applied, and FIG. 2 is a magnet assembly for adjusting static convergence arranged at a rear end of a deflection yoke shown in FIG. FIG. 3 is an enlarged view of a portion, and FIG. 3 is a cross-sectional view taken along line AA shown in FIG. In each drawing, the same components are denoted by the same reference numerals.

The cathode ray tube 1 of the present invention comprises an electron gun 2 sealed inside a neck tube 3, a funnel 4 in the direction of electron beam travel (positive direction of the Z axis), and a panel 5 whose outer surface is made substantially flat. You. A part of the deflection yoke 10 attached to the outside of the cathode ray tube in a region from the neck portion 3 to the funnel portion 4 is cut away. The deflection yoke 10 is made of a horizontal deflection coil 11 through which a high-frequency deflection current of 15 kHz or more flows, a vertical deflection coil 12 through which a deflection current of a low frequency of about 60 Hz flows, and a resin made of resin that electrically insulates the horizontal deflection coil 11 from the vertical deflection coil 12. , A magnetic core (hereinafter abbreviated as a core) 14 made of a ferrite material having high magnetic permeability, a first quadrupole coil 15 and a plurality of ring magnets at the rear end of the deflection coil 10. A convergence adjusting magnet assembly 17 consisting of: a second quadrupole coil 16 toroidally wound around the core 14; and two loop-shaped coils disposed between the first quadrupole coil 15 and the core 14. The configured speed modulation coil 18 and deflection yoke 1
0 is attached to the neck tube 3 and is provided with a tightening band 19. As shown in FIGS. 2 and 3, the magnet assembly 17 used for the static convergence adjustment is 2
Ring-shaped magnets (a pair of 174a and 174b, 175a and 17
5b, 176a and 176b) as one set, a magnet 171 magnetized to two poles, and a magnet 172 magnetized to four poles
Alternatively, the first quadrupole coil 15 composed of four loop-shaped coils 151, 152, 153, and 154 via the convex portion 21 of the holder 20 may be used as one set of the magnets 173 magnetized to have six poles. It is arranged on the outer periphery. Each ring magnet
171, 172, and 173 can change the intensity of the two-pole, four-pole, and six-pole magnetic fields for adjusting the static convergence by changing the opening angle of the two ring-shaped magnets in each set.
In addition, a ring-shaped magnet 2 magnetized into two poles, four poles, and six poles
The two poles that generate a ring-shaped magnet by changing the rotation direction of the
Since the directions of the lines of magnetic force of the quadrupole and hexapole magnetic fields can be changed, the static convergence of the three electron beams can be adjusted.

As shown in FIG. 2, the speed modulation coil 18 is composed of two loop coils 181 and 182, and the angle between the center of the coils 181 and 182 and the horizontal axis is set in a counterclockwise direction. Within the range of 80-100 ° and 260-280 °, desirably 90 ° and 270 ° respectively, the coil 18
Generate a dipole magnetic field oriented in the Y-axis direction.

On the other hand, as shown in the schematic sectional view of FIG.
Loop-shaped coils 1 constituting the quadrupole coil 15 of FIG.
51, 152, 153, 154 center and horizontal axis (X axis)
The angle formed is 35-55 ° counterclockwise, 125-145
°, 215 to 235 ° and 305 to 325 °, preferably at 45 °, 135 °, 225 ° and 315 ° respectively.
In FIG. 3, the central axes of the coils 151 and 153 are indicated by I and I ', and the central axes of the coils 152 and 154 are indicated by Q and Q'. The coils are arranged so that the magnetic poles generated by adjacent coils have opposite polarities. The winding direction and the current direction are set, and the coils 151 and 15 are set so that the magnetic poles generated by the opposing coils have the same polarity.
2, 153 and 154 are wound and connected, so that the magnetic field generated by the coil 15 is indicated by chain lines 25, 26, 27,
A quadrupole magnetic field as schematically shown at 28 is obtained. The quadrupole magnetic field (25, 26, 27, 28) becomes a magnetic field 25 that goes from bottom to top in the space where one side beam 23 passes, and a magnetic field that goes from top to bottom in the space where the other side beam 24 passes. 27, the directions of the magnetic fields 25 and 27 are opposite to each other in the passage area of both side beams 23 and 24. In the case of the quadrupole magnetic field shown in FIG. 3, assuming that the electron beam travels from the bottom to the top of the page, the side beam 23 receives a force 230 in the direction indicated by the white arrow pointing in the positive direction of the X axis, On the other hand, the side beam 24 receives a force 240 in the direction indicated by the white arrow pointing in the negative direction of the X-axis, so that forces in the X-axis direction are applied to the electron beams 23 and 24 in opposite directions. Therefore, the space between the center beam 22 and the side beams 23 and 24 is widened by the action of the forces 230 and 240, and the horizontal space between the electron beams (hereinafter, referred to as the S dimension) which is substantially determined by the space between the electrode holes of the electron gun. Can be greatly varied.

Conversely, when the drive circuit 30 supplies a drive current of the opposite direction to the first quadrupole coil 15, the directions of the magnetic fields 25, 26, 27 and 28 shown by chain lines in FIG. , Forces 230, 24 acting on the side beams 23, 24
Since the direction of 0 is opposite to that of FIG. 3 (not shown), the interval between the electron beams can be reduced, and the effective S dimension can be reduced.

That is, by changing the direction of the current flowing through the first quadrupole coil 15, the S dimension of the electron gun can be equivalently reduced or increased, and the S dimension can be modulated. Becomes

Since the magnetic fields acting on the center beam 22 have opposite polarities at 25 and 27 and opposite polarities at 26 and 28, they cancel each other out, and the force received from the first quadrupole magnetic field becomes almost zero. However, the four loop coils 151, 1
When the mounting angles of 52, 153, and 154 are different, the symmetry of the generated magnetic field is deteriorated, the forces acting on both side beams are different, and an unnecessary force acts on the center beam. Therefore, there was no practical problem if the angle was within the above range.

FIG. 4 is a side view showing the second quadrupole coil 16 provided on the core 14, and FIG.
It is the figure seen from the direction. The angles formed by the centers of the four coils 161, 162, 163, and 164 toroidally wound around the core 14 and the horizontal axis are in the counterclockwise directions of -10 to 100, 80 to 100, and 170, respectively.
~ 190 °, within the range of 260-280 °, desirably 0 ° each,
They are arranged at angles of 90 °, 180 °, and 270 °. The winding direction of the coil and the direction of the current are set so that the lines of magnetic force generated by the adjacent coils have the same pole, and the coils 161, 162, 1
Since the coils 63 and 164 are wound and connected, the magnetic field generated by the second quadrupole coil 16 is represented by chain lines 251 and 26 in FIG.
It becomes a quadrupole magnetic field as schematically shown by 1, 271 and 281. The quadrupole magnetic fields (251, 261, 271 and 281) form a magnetic field 251 from the top to the bottom in the space where the side beam 23 passes.
In the space where the side beams 24 pass, the magnetic field 271 is directed upward from the bottom.
In the passage area No. 4, the directions of the magnetic fields 251 and 271 are opposite to each other. In the case of the quadrupole magnetic field shown in FIG. 5, assuming that the electron beam travels from the bottom to the top of the page, the side beam 23 receives a force 231 in the direction indicated by the white arrow pointing in the negative direction of the X axis, On the other hand, since the side beam 24 receives a force 241 in the direction indicated by the white arrow pointing in the positive direction of the X-axis, forces in the X-axis direction are applied to the electron beams 23 and 24 in opposite directions. Therefore, the distance between the center beam 22 and the side beams 23 and 24 can be reduced by the action of the forces 231 and 241.

Conversely, when the drive circuit 31 supplies a drive current of the opposite direction to the second quadrupole coil 16, the directions of the magnetic fields 251, 261, 271 and 281 shown by chain lines in FIG. 23 acting on the side beams 23 and 24
Since the directions of 1, 241 are opposite to those in FIG. 5 (not shown), the interval between electron beams can be increased.

That is, by changing the direction of the current flowing through the second quadrupole coil 16, the distance between the electron beams can be reduced or increased.

Since the magnetic fields acting on the center beam 22 have opposite polarities 251 and 271 and opposite polarities 261 and 281, they cancel each other out, so that the force received from the second quadrupole magnetic field is almost zero. However, if the mounting angles of the four toroidally wound coils 161, 162, 163, and 164 are different, the symmetry of the generated magnetic field is deteriorated, the forces acting on both side beams are different, and the center beam is also different. Unnecessary force acts, but from the results of the experiment, there was no practical problem if it was within the above-mentioned angle range.

The drive circuit 30 or 31 generates a current synchronized with the horizontal deflection period or the vertical deflection period,
For example, an analog circuit that generates a correction waveform from a resonance waveform of a horizontal or vertical pulse voltage or an integral or differential waveform of the voltage, or an arbitrary waveform can be generated using a digital memory and used as a correction waveform And
For example, the drive circuits 30 and 31 may generate a substantially parabolic wave current having a vertical period. Therefore, the vertical convergence error generated when the landing in the peripheral portion of the panel surface is corrected by using the first quadrupole coil is corrected in the reverse direction by using the second quadrupole coil. The convergence of lines can be corrected, and high-quality images can be reproduced.

FIG. 6 shows a second quadrupole coil 16 'used in the second embodiment of the present invention. In addition,
The same components as those in the first embodiment are denoted by the same reference numerals.
FIG. 6 shows a schematic cross section of the core 14.
The loop-shaped coils 161 ', 162', 163 ', 164' constituting the second quadrupole coil 16 'are arranged inside the four. Four loop-shaped coils 161 ′, 1
The angles formed by the centers of 62 ', 163', and 164 'and the horizontal axis are counterclockwise at 35 to 55 degrees, 125 to 145 degrees, and 215 to 235, respectively.
°, 305-325 °, desirably 45 °, 135 respectively
°, 225 °, and 315 °. In FIG. 6, the center axes of the coils 161 'and 163' are I and I '
The central axes of 2 ′ and 164 ′ are indicated by Q and Q ′. The coil winding direction and the current direction are set so that the magnetic poles generated by the adjacent coils have opposite polarities, and the coils 161 ′ and 16 ′ are set so that the magnetic poles generated by the opposing coils have the same polarity.
Since 2 ', 163' and 164 'are connected by winding,
The magnetic field generated by the coil is indicated by chain lines 252, 262, 27
It becomes a quadrupole magnetic field as schematically shown by 2,282.
The operation of the quadrupole magnetic field is the same as that of the first embodiment, and the description is omitted.

FIG. 7 is a diagram showing a third embodiment.
1 is a configuration diagram illustrating a cathode ray tube display device including a cathode ray tube 1 and a deflection yoke 10 of the present invention. 54 is a video signal input terminal, 55 is a horizontal synchronization signal input terminal, 56 is a vertical synchronization signal input terminal, 50 is a video circuit, 51 is a horizontal deflection circuit, 52 is a vertical deflection circuit, and 53 is a high voltage circuit. The same reference numerals are given to portions corresponding to the drawings, and duplicate description will be omitted.

A video signal is input from an input terminal 54,
After being processed by the video circuit 50, it is supplied to the electron gun 2 of the cathode ray tube 1. A horizontal synchronizing signal is input from an input terminal 55, and is supplied to a horizontal deflection circuit 51, where a horizontal deflection current is supplied.
IH is formed and supplied to the horizontal deflection coil 11 of the deflection yoke 10. The horizontal synchronizing signal is supplied to a high voltage circuit 53 to generate a high DC voltage to be applied to the cathode ray tube 1. A vertical synchronization signal is input from an input terminal 56 and supplied to a vertical deflection circuit 52 to form a vertical deflection current IV.
It is supplied to the vertical deflection coil 12 of the deflection yoke 10. Based on the signal obtained from the vertical deflection circuit 52, the driving circuit 30,
A cathode ray tube display for reproducing a high-quality image by supplying a substantially parabolic wave current having a vertical period from 31 to a first quadrupole coil 15 and a second quadrupole coil 16 wound around the core of the deflection yoke 10. The device has been realized.

[0026]

As described above, according to the present invention, a shadow mask having a small radius of curvature is mounted adjacent to the inner surface of the panel while the outer surface of the panel is flat and the inner surface of the panel is substantially flat. In a color cathode ray tube apparatus for reproducing a high-quality color image by applying a correction magnetic field from the first quadrupole coil and the second quadrupole coil to an electron beam, a color cathode ray tube apparatus provided at a neck portion of the cathode ray tube apparatus. Since a static convergence adjustment magnet assembly is provided on the outer periphery of the quadrupole coil to enable static convergence adjustment, a high-quality color image can be reproduced and a low-cost flat cathode ray tube device can be realized.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a cathode ray tube device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing details of a neck portion in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a side view showing a second quadrupole coil provided on the core of FIG. 1;

FIG. 5 is a diagram viewed from the side of the white arrow B in FIG. 4;

FIG. 6 is a cross-sectional view showing a second quadrupole coil used in the second embodiment of the present invention.

FIG. 7 is a schematic diagram showing a configuration of a cathode ray tube display according to a third embodiment of the present invention.

FIG. 8 is a side view showing a configuration of a conventional cathode ray tube device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cathode ray tube apparatus, 2 ... Electron gun, 3 ... Neck, 4 ... Funnel, 5 ... Panel, 10 ... Deflection yoke, 11 ... Horizontal deflection coil, 12 ... Vertical deflection coil, 13 ... Separator,
14: magnetic core, 15 (151, 152, 153, 154): first
Quadrupole coil, 16 (161, 162, 163, 164), 16 '
(161 ', 162', 163 ', 164') ... second quadrupole coil, 1
7 (171, 172, 173): Magnet assembly for adjusting static convergence, 18 (181, 182): Coil for speed modulation, 19: Tightening band, 20: Holder, 21: Projection of holder part, 30, 31 ... Drive circuit

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshimitsu Watanabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Katsuyuki Kawamura 3300 Hayano, Mobara-shi, Chiba Hitachi Display Group (72) Inventor Hiroyuki Ikeda 3300 Hayano, Mobara-shi, Chiba F-term in Hitachi Display Group 5C042 DD01 DD09 DD20 HH01 HH03 HH14 5C060 BC01 CE02 CF02 CF03 CF04 CF08

Claims (8)

[Claims] A cathode ray tube having an electron gun for generating a plurality of electron beams; a deflection yoke for generating a magnetic field for deflecting the electron beam in a horizontal direction and a vertical direction; and an electron beam and a side at the center of the electron gun. A first coil that generates a quadrupole magnetic field that varies the distance between the electron beam and the second coil; a second coil that generates a quadrupole magnetic field disposed in a magnetic core portion of the deflection yoke; A plurality of ring-shaped magnets having two, four, or six magnetic poles for adjusting static convergence on the outer periphery of the coil. 2. The first coil comprises loop-shaped coils arranged at four locations on the outer periphery of a neck tube in which the electron gun is sealed, and the angle between the center of the coil and a horizontal axis is opposite. Clockwise 35 ° to 55 °, 125 ° to 145 °, 215 ° to 235 °, 305 ° to 3 respectively
2. The cathode ray tube device according to claim 1, wherein the angle is in a range of 25 °. 3. The second coil comprises toroidal wound coils at four positions of the magnetic core portion, and the angle between the center of the coil and the horizontal axis is -10 ° to 10 ° in a counterclockwise direction. °, 80 ° to 100 °, 170 ° to 1
90 °, 260 ° to 280 °, or a loop-shaped coil disposed at four locations inside the magnetic core, and the angle between the center of the coil and the horizontal axis is counterclockwise. 35 ° to 55 °, 125 ° in each direction
2. The cathode ray tube device according to claim 1, wherein the angle is in the range of 145 °, 215 ° to 235 °, and 305 ° to 325 °. 4. The angle between the center of the two loop-shaped coils disposed between the first coil and the magnetic core and the horizontal axis is 80 ° to 100 ° in a counterclockwise direction, respectively.
The cathode ray tube device according to any one of claims 1 to 3, wherein the angle is in a range of 0 ° to 280 °. 5. A driving circuit capable of supplying a correction current of a vertical deflection cycle or a correction current of a horizontal deflection cycle to the first coil and the second coil. The cathode ray tube device according to any one of the above. 6. The cathode ray tube device according to claim 5, wherein a substantially parabolic correction current having a vertical deflection period is supplied to the first coil and the second coil. 7. The cathode ray tube device according to claim 1, wherein the outer surface of the panel is substantially flat, and the shadow mask has a larger curvature than that of the substantially flat panel. 8. A cathode ray tube display device which reproduces an image using the cathode ray tube device according to claim 1.