WO2000036628A1

WO2000036628A1 - Color cathode-ray tube device

Info

Publication number: WO2000036628A1
Application number: PCT/JP1999/007083
Authority: WO
Inventors: Yuuichi Sano; Masahiro Yokota; Hiroaki Ibuki; Hideo Mori
Original assignee: Kabushiki Kaisha Toshiba
Priority date: 1998-12-16
Filing date: 1999-12-16
Publication date: 2000-06-22
Also published as: KR20000048174A; CN1260583A; JP2001043815A; TW442821B

Abstract

A cathode-ray tube device comprising a deflection yoke (14) for reducing the nonuniform magnetic field component of the deflection magnetic field along a first axis which degrades the beam spot on a phosphor screen (15) and correcting the picture distortion and convergence deviating from the first axis and caused along the first axis by means of the deflection magnetic field along a second axis, and convergence correcting means (25) for shifting a pair of side beams (18B, 18R) away from a center beam (18G) relatively at the peripheral part of the phosphor screen (15) only along the first axis in the course of the travel of the beams from the cathodes of electron guns to the center of the deflection yoke (14), whereby a good beam spot of less distortion can be formed over the screen.

Description

Specification

Color cathode ray tube device

Technical field

The present invention relates to a color cathode ray tube device such as a TV brown tube and a monitor brown tube, and particularly to a flat screen or a deep tube for a high-definition TV or a high-resolution monitor. The present invention relates to a color cathode ray tube device capable of preventing deterioration of focus characteristics even if the length is shortened.

Background art

Generally, a color cathode ray tube device has a rectangular display panel. It has a vacuum envelope consisting of a fannhole connected to the nozzle and a cylindrical neck connected to the small end of the fannhole. On the inner surface of the panel, there is provided a phosphor screen having a three-color phosphor layer in the form of dots or stripes that emit blue, green, and red light. . In addition, a shadow mask is opposed to the phosphor screen via a gap on the inner surface of the phosphor screen, and the shadow mask is disposed in the interior of the phosphor screen. The shadow mask is formed with a large number of holes through which an electron beam having a color selection function that causes an electron beam to land on the corresponding three-color phosphor layer and emit light from the corresponding three-color phosphor layer is emitted. Have been. An electron gun device that emits three electron beams is housed in the neck. In addition, a deflection yoke is mounted so as to surround the outside of the small diameter portion of the funnel from the neck force. The three electron beams emitted from the electron gun are deflected by the deflection magnetic field generated by the deflection yoke, and the phosphor screen is passed through the shadow mask. This phosphor screen is horizontally scanned at a high frequency cycle and vertically scanned at a low frequency cycle by an electron beam, so that a color image is screened. Displayed on the lean.

In such a color cathode ray tube device, it is necessary to satisfy the so-called “comparance characteristics” in which three electron beams are concentrated on substantially one point on the phosphor screen. Regarding this convergence characteristic, in the early color cathode ray tube device, an error in which three electron beams were not concentrated at one point, that is, a convergence error was caused by the three electron beams and the phosphor screen. Into a plurality of error patterns derived from the geometric relationship of the deflection yoke, and to the convergence yoke mounted on the neck side of the deflection yoke to correct each error pattern. Satisfactory convergence characteristics are obtained by supplying a convergence correction current. For this reason, in the early color cathode ray tube devices (so-called compensation yoke correction type color cathode ray tube devices), in addition to the deflection current, a convergence correction current having a plurality of special waveforms was used as a drive circuit. It is necessary to supply a correction current from this drive circuit to the convergence shock.

However, at present, there is no inline that does not require the supply of the compensation current. ■ The emergence of a self-convergence type color cathode ray tube device, It has been replaced by a color correction cathode ray tube device. This in-line self-convergence type color cathode ray tube device is a three-electron beam in which the electron gun device consists of a center beam and a pair of side beams passing on the same horizontal plane. It has an in-line type structure that discharges heat. In this in-line device, the deflection The horizontal deflection magnetic field generated by the yoke is formed in a pinkish shape, and the vertical deflection magnetic field is formed in a barrel shape. These non-uniform horizontal and vertical deflection magnetic fields provide exceptional correction means. No convergence is provided, and good convergence characteristics are realized over the entire screen.

In this in-line seno-reflection type color cathode ray tube device, distortion occurs in the electron beam deflected due to the non-uniformity of the deflection magnetic field. In particular, the beam spot around the screen may be collapsed horizontally, resulting in degradation of resolution or moire.

In recent years, however, there has been a strong demand for color cathode ray tubes to have higher resolution, larger screens, shorter overall tube lengths due to wide angle deflection, and flatter screens. Inline self-compensated color cathode ray tube devices that meet such demands require more stringent focus performance, so the entire screen is required. A strong non-uniform deflection magnetic field that concentrates the three electron beams is required. Therefore, in such a color cathode ray tube device, the beam spot formed around the screen is more strongly distorted. Furthermore, since the electron beam directed to the periphery of the screen is incident on the phosphor screen at a large incident angle, the distortion of the beam spot is further promoted.

For a color cathode ray tube with a PCM 1 (pyrite, con- nection-magnet) provided outside the neck around the neck, the PCM 1 can be adjusted. Thus, the three electron beams 3B, 3G, and 3R are concentrated at the center 蛍光 of the phosphor screen 2. With great effort, In such a color cathode ray tube, as shown in Fig. 1, the path length of the three electron beams 3B, 3G, and 3R is not long in the vicinity P of the phosphor screen 2. As a result, as shown by the broken line, the pair of side beams 3B and 3R undergo orthogonal convergence and do not enter the point P.

In order to correct this overconsistency, as shown in Fig. 2A, a horizontal deflection magnetic field 5H generated by a horizontal deflection coil 4H is formed in a pinkish shape. Then, when the electron beam is deflected to the right toward the phosphor screen when viewed from the position of the electron gun, the three electron beams 3B, 3G, and 3R cause a horizontal deflection magnetic field of 5H. Therefore, the force F HB, F HG, and F HR are received. The forces F HB, F HG and F 11 R are

F HB> F HG> F HR

The force F HB, F HG, and F HR make the pair of side beams 3 B, 3 R relatively horizontal to the center beam 3 G (in the H-axis direction). Displaced in the direction away from That is, these forces F HB, F HG, and F HR exert an underconducting action on the electron beam. Similarly, in order to compensate for overcompensation, as shown in FIG. 2B, when a vertical deflection magnetic field 5 V generated by a vertical deflection coil 4 V is formed in a barrel shape, A pair of side beams 3 B and 3 R from a vertical deflection magnetic field of 5 V are applied with forces F VB and F VR, which force the electron beams away from each other horizontally. The electron beam is given a function of undercompensation, including a component that displaces in the direction. Therefore, these horizontal and vertical deflection magnetic fields 5 H, The degree of nonuniformity of 5 V is adjusted, and the three electron beams 3 B, 3 G, and 3 R are concentrated at the periphery P of the screen as shown by the solid line in Fig. 1.

However, when the horizontal and vertical deflection magnetic fields 5H and 5V are set to the above-mentioned non-uniform deflection magnetic fields, the three electron beams 3B, 3G and 3R show arrows 6a and 6 in FIG. A force as shown by b acts, and each of the electron beams 3B, 3G, and 3R receives a lens action that diverges in the horizontal direction and converges in the vertical direction (the V-axis direction).

FIG. 4 is a diagram for explaining the action of the lens formed by the electron gun and the deflecting magnetic field acting on the electron beam. The electron beam is given above the tube axis (Z-axis). The vertical action is shown, and the horizontal action is shown below. In FIG. 4, the broken line indicates the trajectory of the electron beam 3 toward the center of the phosphor screen 2, and the solid line indicates the trajectory of the electron beam 3 toward the periphery. I have. The symbol DL is a lens formed by the above-mentioned deflection magnetic field, and the symbol ML is a main lens that focuses an electron beam 3 formed between the electrodes of the electron gun. The symbol QL is formed between the electrodes in the vicinity of the main lens and uses the voltage that fluctuates dynamically to obtain the foreground at each point on the phosphor screen 2. Auxiliary lens that optimizes gas conditions. The auxiliary lens QL has a function of mainly compensating for the field curvature aberration caused by the path length difference of the electron beam 3 and the astigmatism caused by the lens DL. For the sake of simplicity, the path length difference is omitted in the drawing, and the astigmatic lens having the function of compensating the function of the lens DL around the phosphor screen 2 is shown. In such a lens system, when the electron beam 3 is directed to the center of the phosphor screen 2, the lens DL and the auxiliary lens QL are not formed, so that the horizontal and vertical directions are not formed. Since the lens magnifications are equal, a round object point is formed on the line 7, and a round image point is connected on the phosphor screen 2. However, the electron beam 3 near the phosphor screen 2 is located far away from the main lens ML in the direction of the phosphor screen 2. Focusing in the vertical direction and divergence in the horizontal direction are given by the lens DL, and given by the lens DL by the auxiliary lens QL formed near the main lens ML. The astigmatism given to the electron beam is compensated. Therefore, the magnification of the combination lens combining these lenses DL, QL, and ML is different from the magnification of only the main lens ML, and is reduced in the vertical direction on the phosphor screen 2. The diameter of the beam spot in the vertical direction is reduced, and the diameter of the beam spot on the phosphor screen 2 is increased in the horizontal direction to increase the horizontal diameter of the beam spot on the phosphor screen 2. With respect to the round object point on line 7, an image point horizontally crushed on phosphor screen 2 is connected.

In recent years, such problems have become non-negligible as the screen becomes flatter and / or the resolution becomes higher. In particular, the radius of curvature of the panel approximated by a circle from the drop (position difference) to the neck side along the tube axis between the center of the panel and the diagonal end is the phosphor screen's radius. Becomes twice or more the effective diagonal diameter, and corrects astigmatism caused by the curvature of field and the deviating magnetic field caused by the phosphor screen forming a curved surface. Focus condition This problem has become one of the most important focus characteristics since the realization of a color cathode ray tube device that fluctuates the focus voltage so that the entire screen becomes optimal. I have.

Methods for solving the beam spot distortion due to the non-uniform deflection magnetic field as described above are disclosed in the following documents A, B, C, and the like. In these documents, the horizontal and vertical deflection magnetic fields are homogenized, and the resulting over-convergence at the horizontal and vertical ends is more negative than the center of the deflection yoke. A technique is disclosed which is corrected by the convergence correction means arranged in the system.

Reference A: "A NEW HIGH-RESOLUTION TRINITRON COLOR PICTURE FOR DISPLAY APPLICATION" IEEE TRANS. CONSUMER ELECTRON CE-26 PP466 ~ 471, 1980.

Reference B: "TnE SSC DEFLECTION YOKE FOR IN-LINE COLOR CRT'S" PRO OF THE SID. VOL. 30/1, PP29 ~ 32, 1989.

Literature. : "A NEW PICTURE TUBE SYSTEM WITH HOMOGENEOUS SPOT PERFORMANCE" PRO OF JPN DISPLAY '89, PP458〜461, 1989.

Fig. 5 shows the action of the lens given to the electron beam by the uniform deflection magnetic field and the convergence correction means in these documents. The vertical action given to the electron beam above the tube axis is shown, and the horizontal action given to the electron beam is shown below. The broken line indicates the center of the phosphor screen 2 and the solid line indicates the trajectory of the electron beam 3 toward the periphery. In the lens system shown in FIG. 5, since the horizontal and vertical deflection magnetic fields are uniform magnetic fields, the conventional color cathode ray tube apparatus shown in FIG. Therefore, the lens DL generated by the deflection magnetic field is not formed, the lens CL is formed by the convergence correction means instead, and the lens acting on the electron beam is the main lens ML. Lens with auxiliary lens QL and convergence correction means. L.

The characteristics of the lens CL are determined by the structure of the convergence correcting means. However, basically, the lens CL acts on the electron beam to generate astigmatism similarly to the lens DL. . For example, Document B discloses a structure that generates a magnetic field that corrects the compensation, but uses a magnetic material that locally forms a uniform magnetic field in a region where the correction magnetic field is applied. As a result, the effect of astigmatism is eliminated. However, this lens CL is formed between the cathode gun of the electron gun and the center of the deflection yoke, ideally near the auxiliary lens QL, and has a conventional lens CL. The distance between the auxiliary lens QL and the auxiliary lens QL is significantly smaller than the distance DL. Therefore, even if the lens CL has a critical aberration, the magnification of the combination lens combining the lenses ML, QL, and CL hardly changes, and as a result, the horizontal direction of the beam spot Of the image is improved, and the resolution and the like are improved.

Further, the conventional convergence correction means disclosed in Documents B and C include a horizontal and vertical convergence correction coil and a convergence correction coil for the convergence correction coil. It is composed of current supply means for supplying a parabolic correction current that fluctuates in synchronization with the deflection. In particular, in Document B, an electric circuit consisting of a resistor and a capacitor is provided on the deflection yoke, and is directly connected to the deflection current or deflection voltage. Means for generating a parabolic correction current is disclosed. However, trying to generate the parabolic correction current directly on the deflection yoke in this way, in a simple circuit such as disclosed in this document, a symmetrical, In addition, it is difficult to obtain an ideal waveform that fluctuates quadratically, and the design of the deflection yoke is rather burdensome. Further, the current supply means for supplying the correction current from the drive circuit side has a problem that the load on the drive circuit side is increased.

As described above, the color cathode ray tube device currently emits an in-line type in which the electron gun emits three electron beams arranged in a row consisting of a center beam and a pair of side beams passing on the same horizontal plane. The horizontal deflection magnetic field generated by the deflection yoke is defined as a pin cushion type, and the vertical deflection magnetic field is defined as a barrel type.The three electron beams are arranged in a row by the horizontal and vertical deflection magnetic fields. The in-line self-compensation type color cathode ray tube device in which the light is deflected has been widely put into practical use. In this inline 'self-convergence type color cathode ray tube device, the beam spot is distorted due to the non-uniform polarized magnetic field, and especially the screen There is a problem that the resolution is degraded around the area.

In addition, when the compensation means is provided, the load of the current supply circuit for supplying the compensation current to the compensation circuit and the capacity of the compensation circuit are increased. There is a problem that disturbances in the current waveform of the correction current occur.

Disclosure of the invention

The purpose of this invention is to reduce the overall length of the tube or to flatten the screen. An object of the present invention is to provide a color cathode-ray tube device that can obtain a good beam spot with little distortion over the entire screen without causing any problems even if the technology is advanced.

(1) According to this invention,

A rectangular panel having a first axis and a second axis that intersect with the tube axis and are orthogonal to each other, with a phosphor screen provided on the inner surface, and a funnel-shaped fan connected to the panel The neck and the neck are connected to the end of the small diameter of this funnel, and the drop from the center force of the panel to the neck to the diagonal end along the pipe axis is measured. A vacuum envelope having a flatness set to be equal to or more than twice the diagonal effective diameter of the phosphor screen, with the radius of curvature of the panel whose panel inner surface is approximated by a circle, and provided inside the neck An in-line type electron gun having a cathode and a plurality of electrodes for emitting a three-electron beam arranged in a row composed of a center beam having a first axis direction as an array axis and a pair of side beams,

A deflection yoke that is attached from the neck to the outside of the small diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the directions of the first axis and the second axis. The non-uniform magnetic field component, which degrades the beam spot on the phosphor screen, is reduced mainly for the deflecting magnetic field in the horizontal direction, and the deflecting magnetic field in the second axis direction is mainly reduced. A deflection yoke for compensating for image distortion and comparability in a direction along the first axis that is offset from the first axis.

Between the cathode of the electron gun and the center of the deflection yoke, a pair of sites relative to the center of the phosphor screen and mainly in the direction along the first axis only. Beam from the center beam power A color cathode ray tube device comprising: a compensation means for displacing in a direction away from the color cathode ray tube device;

(2) According to this invention,

A rectangular panel having a first axis and a second axis that intersects the tube axis and is orthogonal to each other, and has a phosphor screen on the inner surface, and a funnel-shaped panel connected to the panel. It consists of a channel and a neck connected to the end of the small diameter of this channel.The drop from the center of the panel to the diagonal end along the pipe axis is reduced. A vacuum envelope having a flatness set to be equal to or more than twice the diagonal effective diameter of the phosphor screen, with the radius of curvature of the panel whose panel inner surface is approximated by a circle, and provided inside the neck An in-line type electron gun having a cathode and a plurality of electrodes for emitting a three-electron beam arranged in a line composed of a center beam having a first axis direction as an arrangement axis and a pair of side beams,

A deflection yoke that is mounted from the neck to the outside of the small-diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the first axis direction and the second axis direction; A deflection yoke for reducing a non-uniform magnetic field component in which a polarized magnetic field in the direction of the first axis or the second axis degrades a beam spot on the phosphor screen;

The center of the phosphor screen in a direction along at least one of the first axis and the second axis between the cathode of the electron gun and the center of the deflection yoke. Convergence correcting means for displacing the pair of side beams relatively away from the center beam in the vicinity of the convergence correcting magnetic field. Coil The coil is provided with a current supply circuit for supplying a compensation current, and the current supply circuit has at least an input voltage having the same waveform as that of the compensation magnetic field. And a convergence correction means for outputting a convergence correction current having the same waveform to the coil described above, wherein the amplification circuit section is provided with convergence correction means mounted on the color cathode ray tube device.

A color cathode ray tube device comprising:

(3) According to the invention, in the color cathode ray tube device described in (2),

The electron gun includes an electrode forming a main lens, and the electrode fluctuates in synchronization with the deflection of the deflection yoke in at least one of the first and second axes. A color-cathode ray tube device is provided in which a bora-shaped waveform voltage is applied and the input voltage to the amplifier circuit is a voltage obtained by diverting the parabola-shaped waveform voltage.

(4) According to the invention, in the color cathode ray tube device described in (2),

A color cathode ray tube device is provided in which an input voltage to an amplifier circuit is a voltage obtained by smoothing a high-frequency fluctuation component of an input voltage in a vertical flyback period.

(5) According to the invention, in the color cathode ray tube device described in (2),

The dispersion compensating means includes a voltage forming circuit section which forms an input voltage to the amplifier circuit section from a deflection voltage or a deflection current of a deflection yoke in an electric circuit, and the voltage forming circuit section includes: A color cathode ray tube device, whose part is mounted on a color cathode ray tube device, is provided. It is.

(6) According to the invention, in the color cathode ray tube device described in (2),

The power supply further comprises a power supply unit for processing the deflection voltage of the deflection yoke in an electric circuit to operate the amplification circuit unit, and the power supply unit is mounted on the color cathode ray tube device. Is provided.

(7) According to the present invention,

A rectangular panel having a first axis and a second axis that intersect with the tube axis and are orthogonal to each other, with a phosphor screen provided on the inner surface, and a funnel-shaped fan connected to the panel The panel consists of a neck and a neck connected to the end of the small diameter of this funnel, and the panel is determined based on the head drop from the center of the panel to the diagonal end along the pipe axis. A vacuum envelope having a flatness defined such that the radius of curvature of the panel whose inner surface is approximated by a circle is at least twice the diagonal effective diameter of the phosphor screen,

A cathode that emits a three-electron beam arranged in a line composed of one center beam and a pair of side beams having an array axis in the first axis direction, and a plurality of electrodes provided in the network An inline electron gun,

A deflection yoke that is mounted from the neck to the outside of the small diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the first axis direction and the second axis direction; A deflection yoke for reducing a non-uniform magnetic field component, in which a polarizing magnetic field in the direction of one axis or the second axis degrades a beam spot on the phosphor screen,

The distance between the cathode of the electron gun and the center of the deflection yoke is in a direction along at least one of the first axis and the second axis. Convergence correction means for displacing the pair of side beams relatively away from the center beam beam in the vicinity of the center of the optical screen and around the center of the optical body screen. The compensation means includes a capacitor for generating a compensation magnetic field, and a current supply circuit for supplying a compensation current to the coil. A color cathode ray tube device comprising: a convergence correction means for correcting convergence by causing the coil of the means to differentially shift the symmetry of convergence with respect to the second axis. Is done.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram for explaining the convergence of three electron beams at the center and the corner of the phosphor screen of a conventional color cathode ray tube device.

FIG. 2A is a diagram showing a horizontal deflection magnetic field generated by a deflection yoke of a conventional color cathode ray tube device.

FIG. 2B is a diagram showing a vertical deflection magnetic field generated by a deflection yoke of the conventional color cathode ray tube device.

FIG. 3 is a diagram for explaining the force exerted on the electron beam by the deflection magnetic field of the conventional color cathode ray tube device.

FIG. 4 is a diagram for explaining the lens action that the deflection magnetic field of the conventional color cathode ray tube device exerts on the electron beam.

FIG. 5 is a diagram for explaining the lens action exerted on the electron beam by the convergence correcting means of the conventional color cathode ray tube device.

FIG. 6 shows a color cathode ray tube apparatus according to an embodiment of the present invention. FIG. 3 is a diagram showing a configuration of the device.

FIG. 7 is a diagram showing a horizontal deflection magnetic field generated by a deflection yoke of the color cathode ray tube device shown in FIG.

FIG. 8 is a diagram showing image distortion generated when the horizontal deflection magnetic field of the deflection yoke shown in FIG. 7 is weakened.

FIG. 9 is a diagram for explaining a method of adjusting the convergence of three electron beams at the center and the left and right ends of the phosphor screen of the color cathode ray tube device shown in FIG.

FIG. 10 is a diagram showing the shape of the beam spot of the color cathode ray tube device shown in FIG.

FIG. 11 is a perspective view schematically showing a structure of a deflection yoke provided in a color cathode ray tube device as convergence correcting means according to the first embodiment of the present invention.

FIG. 12 is a diagram illustrating a configuration of a current supply circuit that supplies a current to the convergence correction coil of the convergence correction unit illustrated in FIG. 11.

FIG. 13 is a diagram showing a configuration of a parabolic waveform voltage forming circuit that supplies a parabolic waveform voltage to the current supply circuit shown in FIG.

FIG. 14 is a diagram illustrating a configuration of a power supply unit that supplies a DC voltage to the current supply circuit illustrated in FIG.

FIG. 15 is a cross-sectional view schematically showing a structure of a convergence correction coil provided in a deflection yoke according to the second embodiment of the present invention.

FIG. 16 shows a second embodiment of the present invention. FIG. 4 is a perspective view schematically showing a structure of a correction coil.

FIG. 17A is a cross-sectional view schematically showing a structure of a compensation coil provided in the deflection yoke according to the third embodiment of the present invention.

FIG. 17B is a diagram showing a circuit configuration for supplying a current to the consonance correction coil shown in FIG. 17A.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a color cathode ray tube device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 6 schematically shows a basic structure of a color cathode ray tube device according to one embodiment of the present invention. This color cathode ray tube device has a vacuum envelope, and the vacuum envelope is a horizontal axis that intersects the tube axis (Z axis) and is orthogonal to each other, that is, a first axis (H axis) and a vertical axis. That is, a rectangular panel 10 having the second axis (V axis), a funnel-shaped funnel 11 connected to this panel 10 and a small-diameter end of this funnel 11 are connected. It is composed of a cylindrical neck 12 that has been formed. Nenore 10 is a circle approximation from the drop (distance difference along the pipe axis) to the neck 12 along the pipe axis (Z-axis) between the center and the diagonal end of Panenore 10 The radius of curvature of the panel 10 thus obtained has a flatness defined to be at least twice the diagonal effective diameter of the phosphor screen described later. The deflection jokes 14 are mounted by applying force to the small diameter portions 13 of the fans 11 from the side forces of the fans 11 of the neck 12. No ,. On the inner surface of the panel 10, a phosphor having a three-color phosphor layer of a dot shape or a stripe shape which emits blue, green, and red (in the illustrated example, a stripe shape). Screen 15 Power It is provided. In addition, a shadow mask 17 is disposed facing the phosphor screen 15 with a gap therebetween, and the shadow mask has an electron beam on its facing surface. A large number of electron beam passage holes 16 having a so-called color selection function are formed in a predetermined arrangement pitch so as to allow the light to pass through to the corresponding phosphor layer. In the network 12, a three-electron beam 18 consisting of a center beam 18 G and a pair of side beams 18 B and 18 R that pass on the same horizontal plane and consisting of a pair of side beams 18 B and 18 R is provided. An electron gun device 19 for emitting B, 18G, 18R is provided. In addition, a PCM (Purity Compatibility 'Magnet) (not shown) is attached to the rear of the deflection yoke 14 and outside the neck 12. Have been.

The electron gun device 19 has three cathodes arranged in a row in the horizontal direction, three heaters for heating these cathodes, and a phosphor screen 15 from the cathodes. It has multiple electrodes. By using the plurality of electrodes, at least a main beam for focusing the three electron beams 18B, 18G, and 18R in a row arranged at least from the cathode toward the screen. In addition, an auxiliary lens that diverges in the vertical direction and converges in the horizontal direction due to the application of a voltage that fluctuates in synchronization with the deflection of the deflection yoke 14 is formed.

The deflection yoke 14 includes a horizontal deflection coil for generating a horizontal deflection magnetic field for horizontally deflecting the three electron beams 18 Β, 18 G, and 18 R emitted from the electron gun device 19. It has a vertical deflection coil that generates a vertical deflection magnetic field that deflects vertically. As shown in Fig. 7, the horizontal deflection occurs when the horizontal deflection coils 21a and 21b occur. The magnetic field 22H generates a substantially uniform magnetic field. When the horizontal deflection magnetic field is homogenized in this way, the electron beam directed to the diagonal end of the phosphor screen is more intense than the conventional pinkion-type horizontal deflection magnetic field. As a result, the vertical component of the horizontal deflection magnetic field acting in the direction that hinders vertical deflection decreases, and the upper and lower edges of the screen 24 are distorted in a pinkish shape, as shown in FIG. Therefore, in order to correct such pinkish image distortion, the deflection yoke 14 is provided with a distortion correction means (not shown) consisting of a set of NS magnets. The function to correct this distortion has been enhanced. On the other hand, the vertical deflection magnetic field generated by the vertical deflection coil is determined in a barrel shape, and the barrel-type magnetic field is strengthened, and the upper and lower portions of the screen 24 due to the enhancement of the distortion correction function described above. The corner convergence at the end is compensated for by the under convergence due to the vertical deflection magnetic field in the form of the knob.

That is, in the deflection system according to the embodiment of the present invention, the pinkish image distortion is corrected in a state where the compatibility at the upper and lower ends of the screen 24 is satisfied.

Further, in the color cathode ray tube device according to one embodiment of the present invention, three electron beams 18 are provided between the cathode of the electron gun 19 and the center of the deflection yoke 14. When B, 18G, and 18R move toward the horizontal periphery of the phosphor screen 15, three electron beams 18B, 18G, and 18R form a pair in the arrangement direction. A magnetic or electrical means that operates to move the side beams 18B and 18R of the beam away from the center beam 18G force (under-consumption). A convergence correction means (not shown) is provided. As described above, if the horizontal deflection magnetic field 22H generated by the horizontal deflection coils 21a and 2lb is defined as a uniform magnetic field, as shown in Fig. 7, the horizontal deflection magnetic field 22H 3 The forces F HB, F BG, and F HR received by the electron beams 18 B, 18 G, and 18 R become equal. In the conventional color cathode ray tube apparatus, as shown by the broken line in FIG. 1, over-convergence occurs at the left and right ends of the phosphor screen, but in this embodiment, the over-convergence occurs. Since a sense correction means is provided, a pair of side beams 18B and 18R are connected to the pair of side beams 18B and 18R at the left and right ends P of the phosphor screen 15 as shown in FIG. The forces FSB and FSR from the correction means 25 act to compensate for the overcompensation due to the use of the horizontal deflection magnetic field as a uniform magnetic field. , 18 R can be matched. However, at the center O of the phosphor screen 15, the compensation means 25 does not operate, and the three electron beams 18 B and 18 G. 18 R remain coincident. is there. Reference numeral 26 denotes PCM.

Therefore, when the color cathode ray tube device is configured as described above, the horizontal deflection magnetic field 2 is generated at the left and right ends of the phosphor screen 15 in the same manner as in the technology disclosed in Documents A, B, and the like. The uniformization of 2 II alleviates the collapse of the beam spot and improves the resolution.

On the other hand, since the vertical deflection magnetic field remains non-uniform (rather, the barrel shape is strengthened), the same effect as in the conventional technology is obtained at the upper and lower ends of the phosphor screen 15. It is thought that this is not expected, but the phosphor screen of the electron beams 18B, 18G, and 18R Regarding the angle of incidence on the screen 15, since the angle of incidence increases around the phosphor screen 15, the beam spot is distorted into a shape extending in the emission direction. Therefore, the phosphor screen

At the left and right ends of Fig. 15, the direction in which the non-uniform deflection magnetic field exerts an effect on the beam spot and the effect of an increase in the incident angle are mutually intensified. The distortion of the kit is increased, but at the upper and lower ends, the effects of both tend to compensate each other. Therefore, the distortion of the beam spot is reduced and the screen is distorted as shown in Fig.

At the upper and lower ends of 24, the beam spots 28B, 28G and 28R have almost no distortion. On the other hand, the vertical deflection tends to be slightly collapsed due to the enhancement of the distortion correcting means having the lens action opposite to that of the norrel-type vertical deflection magnetic field.

Further, when the color cathode ray tube device is configured as described above, convergence correction in the vertical axis direction is basically unnecessary. In this embodiment, the current supply circuit of the convergence correction means 25 corrects only in the horizontal axis direction, and the current supply circuit in the vertical axis direction is omitted.

In the above embodiment, the convergence correcting means which acts on the under convergence at the left and right ends of the phosphor screen has been described. Conversely, the convergence correcting means may be used. May act on ohno-convergence at the center of the phosphor screen. That is, the convergence correction means sets the side beam to the center when the three electron beams are directed to the left and right ends as opposed to the vicinity of the center of the phosphor screen. What is necessary is just to change it in the direction away from the beam. The horizontal deflection magnetic field is not limited to a uniform magnetic field, but can be changed to a weaker, pinkish-type / barrel type by changing the correction amount of the compensating means. You may do it. As described above, when the horizontal deflection magnetic field is non-uniform, for example, when the horizontal deflection magnetic field is a barrel type, the magnification of the combination lens at the left and right ends of the phosphor screen is increased in the vertical direction, The beam spot can be reduced in the horizontal direction to be a beam spot collapsed in the vertical direction, and the distortion of the beam spot due to the above-described incident angle can be compensated.

FIG. 11 shows a more specific deflection yoke according to the embodiment of the present invention in which means for correcting convergence is provided. The deflection yoke 14 shown in FIG. 11 is a pair of upper and lower horizontal deflection coils 2 la and 2 lb for deflecting the electron beam in the horizontal direction, and a pair of left and right horizontal deflection coils for deflecting the electron beam in the vertical direction. It has vertical deflection coils 30a and 3Ob and a magnetic core 31. On the neck side (rear side corresponding to the right side in the drawing) of the deflection yoke 14, a magnetic core 33a, 33 having a shape in which both sides of a rod-like body extend at right angles. A pair of comma-free cores 34a and 34b each having a coil (not shown) wound around b are arranged so that the extending ends of the magnetic cores are opposed to each other. . Also, a pair of rod-shaped NS magnets 35a and 35b are provided above and below the phosphor screen side of the deflection yoke 14 (the front side corresponding to the left side in the drawing). Are arranged as means for correcting the distortion given to the electron beam.

Further, in this embodiment, the core as a means for correcting the convergence of the magnetic cores 33a, 33b of the pair of comma-free cores 34a, 34b. Infinity 36 a, 36 b (Compensation correction Nore) is wound around. The convergence correction coils 36a and 36b are such that the four magnetic poles generated at the tip of the magnetic cores 33a and 33b are inverted in the quadrant where the magnetic poles are adjacent to each other. It has the effect of over- or under-converging a pair of side beams by a quadrupole magnetic field generated by energization.

FIG. 12 shows a convergence correction current supply circuit for supplying current to a coil as convergence correction means. The convergence correction current supply circuit 37 includes a current output circuit section 37 for operating a convergence correction coil, and the current output circuit section 37 includes an amplification amplifier 38 and a feedback resistor. The color cathode ray tube, except for the supply of the parabolic waveform voltage 40, which varies with the horizontal deflection frequency, the DC power supply 41a, 41b, and the ground 42. Mounted on the device. In a high-definition TV or high-resolution monitor, the parabolic waveform voltage 40 is generated by a focus voltage that fluctuates in synchronization with the deflection of the electron beam. Can be used as the parabolic waveform voltage 40. In this current output circuit section 37, a connection noise correction capacitor 36 (coils 36a, 36b) is connected in series with the feedback resistor 39 between the amplifier 38 and the ground 42. Is connected, and the convergence correction coil 36 side of the feedback resistor 39 is fed back to the amplification amplifier 38 to be relayed. Therefore, when the parabolic waveform voltage 40 is input to the amplification amplifier 38, the amplification amplifier 38 operates so as to eliminate the difference between the voltage and the feedback voltage, and consequently the core voltage increases. Mpase Operates to supply a current having the same waveform as the parabola waveform voltage 40 to the coil 36.

Therefore, such a current output circuit section operates only to convert and output a current of the same shape by input of a parabolic waveform voltage, and the drive circuit side An existing focus voltage that fluctuates in synchronization with the deflection of the electron beam is used as the parabolic waveform voltage 40, and the DC power supply 4 that can be used together with the existing DC power supply as a power source You only need to supply la, 4 1 b. In addition, unlike the conventional example in which a parabolic waveform current is formed directly on the deflection yoke, there is no need to impose any electric power on the voltage of the deflection system, and a parabolic paradigm close to the ideal is obtained. Waveform current can be obtained.

The amplification amplifier 38 is usually composed of a transistor or the like, but recently various OP amplifiers that can withstand high frequency and high power are commercially available. By using it, the size and cost of the circuit can be reduced.

In addition, such a current output circuit section uses a diode or the like as an energy suppression means to cut the sharp portion of the parabolic waveform voltage 4 ° and then amplify it. You may input it to the amplifier 38. Since the pointed portion of the parabolic waveform voltage 40 fluctuates at a high frequency, the energy consumption of the amplifier 38 becomes large when the current waveform follows the voltage waveform. Therefore, as described above, the sharp voltage of the parabolic waveform voltage 40 is forcibly applied to input the waveform voltage smoothly, so that the power consumption can be suppressed and the amplification amplifier 3 can be used. 8 can be constructed inexpensively. You. Note that the sharp portion of the parabolic waveform voltage 40 is a horizontal retrace period that is not displayed on the screen, and thus has no effect on the screen.

If a DC voltage is superimposed on the parabolic waveform voltage 4 ° and input, the convergence of a pair of side beams in the horizontal direction can be adjusted over the entire screen, and the user can adjust the convergence. It can be used to adjust

Also, as described above, the external card is not available. Even without inputting the parabolic waveform voltage 40, the parabolic waveform voltage 40 of the horizontal deflection frequency can be formed on the deflection yoke from the horizontal deflection voltage or the horizontal deflection current. Figure 13 shows the parabolic waveform voltage forming circuit. The parabolic waveform voltage forming circuit 43 is connected to the ground 42 via a capacitor 44 and a shunt resistor 45 on the negative side of the horizontal deflection coils 2 la and 21 b. Circuit. When such a circuit is provided, the tooth-shaped horizontal deflection current flowing through the horizontal deflection circuit is shunted to the capacitor 44 via the shunt resistor 45, and the charge is accumulated, and the accumulated charge is accumulated. By this discharge, a parabolic waveform voltage 40 of the horizontal deflection frequency can be extracted from the shunt resistor 45 side.

Even if the parabolic waveform voltage 40 is formed in this way, since the power for the above-described voltage-to-current conversion is supplied from an external DC power supply, a conventional parabolic waveform current is directly formed. As described above, there is no problem that the deflection power is affected or the formed parabolic waveform current waveform is disturbed.

In addition, resistors 46 and 47 for detecting a sawtooth voltage are provided on the negative side of the horizontal deflection coils 21a and 21b, respectively. The sawtooth-shaped horizontal deflection current flowing through the shunt is divided to form a sawtooth-shaped voltage waveform 48 and a sawtooth-shaped voltage waveform 49 obtained by inverting the voltage waveform 48, and the variable resistor 50 Thus, the voltage waveforms 48 and 49 are appropriately divided to form a sawtooth voltage waveform, which is superimposed on the parabolic waveform voltage 40 and is applied to the amplification amplifier 38 of the current output circuit section. Entered. According to such a circuit, the convergence correction amount can be adjusted differentially on the left and right sides of the screen by adjusting the variable resistor 50.

Similarly, by making the shunt resistor 45 a variable resistor, the wave height of the parabolic waveform voltage can be adjusted, and the entire compensation compensation amount can be adjusted. .

Further, as shown in FIG. 14, the AC component of the pulse-like horizontal deflection voltage is passed through the capacitor 52 from the negative side capacitor of the horizontal deflection capacitors 21a and 21b. Diodes 54a, 54b and capacitors 55a, 55b are taken out and connected in series with resistors 53a, 53b and these resistors 53a, 53b, respectively. According to b, the plus or minus part of the AC component of the horizontal deflection voltage is supplied as the DC power supply 41 a, 41 b of the amplifier 38 of the current output circuit. Thus, the power supply unit 56 can be provided on the deflection yoke without the need for supply from an external DC power supply.

In this case, since the power related to the above-described voltage-current conversion is also supplied from the power supply of the deflection system, the deflection power is shared with the power related to the formation of the parabolic waveform current. No ,. Laboratory waveform Current disturbance does not occur.

Therefore, such a convergence correction current supply circuit In addition to operating the compensation coil, the weakening of the pinking shape of the horizontal deflection magnetic field of the deflection yoke allows the entire image to be displayed. The convergence can be matched, and the distortion of the beam spot can be improved over the entire surface of the phosphor screen.

However, in this embodiment, when the pinkish shape of the horizontal deflection magnetic field is weakened, the direction that prevents vertical deflection of the electron beam directed to the diagonal end of the phosphor screen is reduced. The vertical component of the horizontal magnetic field acting on the screen decreases, and pinkish distortion occurs at the upper and lower ends of the screen 24 shown in FIG. Therefore, in this embodiment, the magnetic force of the pair of NS magnets 35a and 35b shown in Fig. 11 was strengthened, and the barrel shape of the vertical deflection magnetic field was strengthened. Need to be done. As described above, when the magnetic force of the pair of NS magnets is strengthened, the connection of the side beams at the upper and lower ends of the phosphor screen becomes the same as the foreground. It is used for technology. In addition, when the barrel shape of the vertical deflection magnetic field is strengthened, the vertical deflection magnetic field acts on the under-convergence of the electron beam. Therefore, as described above, the barrel shape of the NS magnet and the vertically polarized magnetic field is strengthened, so that the distortion of the pinkish shape at the upper and lower ends of the screen can be achieved with the convergence satisfied. It can be corrected.

Therefore, with the above-described configuration, the correction of the compensation can be basically performed only in the horizontal direction, and the configuration of the correction means is simplified. be able to. As a specific example, an inline self-container with a maximum diagonal angle of 100 ° using a panel with an effective diagonal diameter of 46 cm and a curvature approximately three times the diagonal effective diameter. With respect to the balance type cathode ray tube device, the above-mentioned compensation means makes it possible for the center of the phosphor screen to be approximately 8 at 1 at the left and right ends relative to the center of the phosphor screen. The convergence of the horizontal deflection magnetic field was reduced accordingly. As a result, the horizontal / vertical diameter of the beam spot at the left and right ends of the phosphor screen could be improved from the conventional 0.35 to 0.55.

At the same time, the dynamic voltage at the left and right ends of the phosphor screen, which previously required 600 V, could be changed to 370 V. This is because the astigmatism is also reduced by the above-described beam spot distortion improving effect. Further, by increasing the convergence correction amount, the distortion of the beam spot can be further corrected in the longitudinal direction. In addition, the voltage that fluctuates dynamically can be finally reduced to a value necessary for correcting defocus due to field curvature aberration.

In the above embodiment, since the convergence correction coil is wound around the magnetic core of the top free coil, an extra component member is deleted, and the convergence correction coil is removed. The means can be a compact design.

As for the convergence correction means, as shown in Fig. 15, a ferrite ring core 57 is used as a magnetic core, and the convergence correction means projects out of the ring core 57. Each of the protrusions 58 is wound with a compensation coil 36 a to 36 b to generate a quadrupole magnetic field. The structure may be adopted. In this case, the number of the magnetic cores of the compensation correction coils 36a to 36b may be four, but the degree of freedom of the distribution of the coma coil that is also used for multiple windings is considered. In this case, it is desirable to provide about eight protrusions 58 as shown in the figure. Specifically, the cross-sectional area of the projection 58 is 5 × X 5 ■, and the connection correction coils 36 a to 36 d are wound around the projection 58. By doing so, the sensitivity of the orbit correction can be improved as compared to the case where the core is wound around a silicon steel core.

Such a convergence correction means can increase the sensitivity of the correction of the convergence by increasing the cross-sectional area of the magnetic core.However, in the case of an inexpensive carbon steel sheet, As the cross-sectional area increases, adverse effects such as heat generation and induced breakdown are caused by the horizontal deflection magnetic field fluctuating at high frequencies. Therefore, it is effective to use a high-resistance material such as ferrite as described above.

Further, as shown in Fig. 16, the convergence correction means is composed of four convergence correction coils 36a to 36d curved in an arc shape, and these four convergence correction means are provided. The noise compensation coils 36a to 36d are arranged so as to surround the vacuum envelope between the main lens of the electron gun and the center of the deflection yoke. You may. In such a convergence correction means, the convergence correction sensitivity can be improved by increasing the magnetic path length L. If the resonance correction coil 36a-36d is moved too close to the phosphor screen, the beam spot distortion, which is a conventional problem, will be reduced. It cannot be improved. Also, if the compensation lens 36a to 36d is too close to the cathode side, the power passing through the main lens will be lost. The trajectory of the daughter beam may be changed, and the beam spot may be degraded due to the spherical aberration of the lens. Therefore, ideally, the neck where the deflection yoke is mounted is good.

Furthermore, the compensation means is not limited to those which generate a quadrupole magnetic field. For example, as shown in FIG. 17A, the neck of the deflection yoke is used. The convergence correction coils 36a and 36b are wound on the left and right sides of the ring-shaped core 60 arranged on the left side, and these convergence correction coils are used. 36a and 36b may be connected to the horizontal deflection coils 2la and 21b via the circuit shown in Fig. 17B. In this circuit, the saturable cores 62 magnetically biased by the magnets 6 la and 61 b are connected to the horizontal deflection coils 21 a and 21 b in a direction to mutually compensate the magnetic field. The variable load coils 6 3 a and 6 3 b connected to the variable load coils 6 3 a and 6 3 b are wound around the variable load coils 6 3 a and 6 3 b, respectively. 6a and 36b are connected.

In such a convergence correction means, when a horizontal deflection current flows, one of the load variable capacitors 63a and 63b increases due to magnetic saturation, and the other load decreases. I do. As a result, at the left end of the phosphor screen, one of the magnetic fields of the convergence correcting coils 36a and 36b becomes larger than the other, and at the right end, the magnetic field becomes larger. It operates differentially so that the magnitude of Therefore, the compensation means is provided on the side where the differentially generated magnetic fields of the compensation coils 36a and 36b are always deflected in a direction to assist horizontal deflection. Configuration that acts strongly on the side beam of the The convergence of a pair of side beams can be corrected by employing a configuration that works strongly on the side beam opposite to the side that is always deflected.

Industrial applicability

As described above, the deflection yoke from the cathode of the electronic pig of the in-line self-compensation type color cathode ray tube used for high-definition TV, high-resolution monitor, etc. By providing convergence correction means for the problem up to the center, it is possible to eliminate the distortion of the beam spot over the entire screen and to make the beam spot almost circular. Also, by separating the convergence correction current into the voltage-Z current conversion part and the correction voltage generation part, an ideal correction current waveform can be obtained, and the consumed gravity can be separated from the deflection power. it can.

Claims

The scope of the claims

(1) A rectangular panel having a first axis and a second axis that intersect with the tube axis and are orthogonal to each other, and in which a phosphor screen is provided on the inner surface. A funnel-shaped funnel connected to the panel and a network connected to the end of the small diameter of this funnel. The diagonal end along the pipe axis from the center force of the panel. The outer radius of curvature of the panel whose circular radius is approximately twice or more than the effective diagonal diameter of the phosphor screen, with the panel inner surface being circularly approximated based on the head drop to the neck side Enclosure and,

A cathode that emits a three-electron beam arranged in a line, comprising a center beam having a first axis direction as an array axis and a pair of side beam cars, and a plurality of electrodes provided in the network; An online gun and

A deflection yoke that is attached from the neck to the outside of the small diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the directions of the first axis and the second axis. As for the deflecting magnetic field in the horizontal direction, the asymmetric magnetic field component that degrades the beam spot on the phosphor screen is reduced, and the deflecting magnetic field in the second axial direction is mainly used. A deflection yoke for compensating for image distortion and compensability in a direction along the first axis, which is offset from the first axis; and

Between the cathode of the electron gun and the center of the deflection yoke, a pair of sides relatively to the center of the phosphor screen and mainly in the direction along the first axis Means for compensating the beam for displacing the beam in a direction away from the center beam;

A color cathode ray tube device comprising:

(2) It has a first axis and a second axis that intersect with the tube axis and are orthogonal to each other, and are connected to a rectangular panel, nose, and angle panel with a phosphor screen provided on the inner surface. A funnel-shaped funnel and a neck connected to the small diameter end of this funnel, and the neck side from the center of the panel to the diagonal end along the pipe axis A vacuum envelope having a flatness defined such that the radius of curvature of the panel obtained by approximating the panel inner surface to a circle based on the head drop is at least twice the effective diagonal diameter of the phosphor screen,

A cathode that emits a three-electron beam arranged in a line, comprising a center beam having a first axis direction as an arrangement axis and a pair of side beams, and a plurality of electrodes. An online gun

A deflection yoke that is attached from the neck to the outside of the small-diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the directions of the first axis and the second axis; A deflection yoke for reducing a non-uniform magnetic field component in which a polarized magnetic field in the axial or second axial direction degrades a beam spot on the phosphor screen;

From the cathode of the electron gun to the center of the deflection yoke, the center of the phosphor screen in a direction along at least one of the first axis and the second axis. Consonance correction means for relatively displacing the pair of side beams in a direction away from the center beam in the vicinity of the center beam, and the consonance correction means The means includes a coil for generating a convergence correction magnetic field and a current supply circuit for supplying a convergence correction current to the coil, and at least this current supply circuit is provided. The above components It has an amplifier circuit section that outputs a convergence correction current of the same waveform to the above-mentioned coil by an input voltage of the same waveform as the magnetic field for the presence correction, and this amplifier circuit section is mounted on the color cathode ray tube device. Provided compensation means,

A color cathode ray tube device comprising:

(3) The electron gun includes an electrode forming the main lens, and the electrode fluctuates in synchronization with the deflection of the deflection yoke in at least one direction of the first axis and the second axis. 3. The color cathode ray tube device according to claim 2, wherein a parabolic waveform voltage is applied, and the input voltage to the amplifier circuit is a voltage obtained by converting the parabolic waveform voltage.

(4) The color cathode ray tube device according to claim 2, wherein the input voltage to the amplifier circuit is a voltage obtained by smoothing a high-frequency fluctuation component of the input voltage during the vertical flyback period.

(5) The dispersion compensating means includes a voltage forming circuit section for forming an input voltage to the amplifying circuit section from a deflection voltage or a deflection current of the deflection yoke in an electric circuit, and includes a voltage forming circuit section. 3. The color cathode ray tube device according to claim 2, wherein the circuit unit is mounted on the color cathode ray tube device.

(6) The power supply unit further includes a power supply unit for processing the deflection voltage of the deflection yoke in an electric circuit to operate the amplification circuit unit, and the power supply unit is mounted on the color cathode ray tube device. The color cathode ray tube device described in (1).

(7) A rectangular panel having a first axis and a second axis that intersect with the tube axis and are orthogonal to each other, and in which a phosphor screen is provided on the inner surface. Funnel-shaped funnel connected to the funnel and this funnel It consists of a series of necks connected to the end of the small diameter part of the panel, and a circular approximation of the inner surface of the panel based on the drop from the panel center to the neck side along the pipe axis to the diagonal end. A vacuum envelope having a flatness determined such that the radius of curvature of the panel obtained is at least twice the diagonal effective diameter of the phosphor screen, and

A cathode and a plurality of electrodes, which are provided in the network, and emit a three-electron beam arranged in a line including a center beam having a first axis direction as an array axis and a pair of side beam cars. An in-line type electron gun,

A deflection yoke that is attached from the neck to the outside of the small-diameter portion of the funnel and generates a deflection magnetic field that deflects the electron beam in the directions of the first axis and the second axis; A deflection yoke for reducing an asymmetric magnetic field component in which a polarized magnetic field in the direction of the first axis or the second axis degrades a beam spot on the phosphor screen;

From the cathode of the electron gun to the center of the deflection yoke, the center of the phosphor screen in a direction along at least one of the first axis and the second axis. Convergence correction means for relatively displacing the pair of side beams in a direction away from the center beam in the vicinity of the convergence correction means, and the convergence correction means performs the convergence correction. A coil for generating a magnetic field and a current supply circuit for supplying a convergence correction current to the coil, wherein the coil of the convergence correction means is a coil for the second axis. A color cathode ray tube device comprising: convergence correction means for correcting convergence by differentially shifting the symmetry of the impedance.