JPH07249385A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To reduce a leakage electromagnetic field formed in a circumference by arranging a plurality of deflection yokes in a specified pattern, supplying relatively low frequency deflecting current to the deflection yoke on the one side and relatively high frequency deflecting current to the deflecting yoke on the other side. CONSTITUTION:A deflection yoke 40 has a core 41, a (y) coil 42Y arranged on the inside of the core 41, and an (x) coil 42X arranged on the inside of the coil 42Y. Relatively low frequency deflecting current for scanning electron beams in an X direction passes to the coil 42X, and relatively high frequency deflecting current for scanning electron beams in a Y direction passes to the coil 42Y. The coil 42Y through which high frequency scanning current flows is arranged between the core 41 and the coil 42X. The core 41 is made of a material with high magnetic permeability and has a shielding function to an electrostatic field which varies with time to prevent the leakage of the electrostatic field. Since a frequency component applied to the coil 42Y is made to relatively low impedance against earth, leakage from the inside of the coil is also prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube device including a color cathode ray tube and a deflection yoke.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view (A) and a front view (B) showing the structure of a conventional general color cathode ray tube device related to the present invention. The color cathode ray tube device 1 includes a glass panel 2 which is a portion on which an image is displayed, a funnel 3 having a substantially cone shape connected to the glass panel 2, and a cylindrical neck portion 4 connected to the vacuum panel to form a vacuum container. It is configured.

A fluorescent screen 10 is provided on the inner surface of the panel 1, and a shadow mask 20 is disposed near the fluorescent screen 10 so as to face the fluorescent screen 10 and maintain a predetermined distance.
The shadow mask 20 is formed by forming a thin metal plate into a predetermined convex curved surface, and a large number of regular electron beam transmitting holes 21 are provided on the curved surface. The shadow mask 20 is welded at its periphery to a frame 22 made of a relatively thick metal plate in order to maintain it in a predetermined shape and to fix it at a predetermined position in the panel. The frame 22 is held at a predetermined position in the panel 2 by a holding member (not shown).

On the other hand, an electron gun 30, which is a generator of three electron beams, is arranged in the neck portion 4.
An electron beam emitted from 0 (a representative one is shown by reference numeral 100 in the drawing) is deflected in a desired direction by a magnetic field generated by a deflection yoke 40 arranged near the connection portion between the neck portion 4 and the funnel 3. And goes to the phosphor screen 10,
Since the shadow mask 20 is disposed here, only those that have passed through the electron beam transmission holes 21 provided in the shadow mask reach the phosphor screen 10. The phosphor screen 10 is composed of an assembly of phosphor mosaics 11, and the electron beam impinges on one of the predetermined ones to emit it in a predetermined color.

On the inner surface of the funnel 3, an internal magnetic shield 50 made of a thin metal having high magnetic permeability is arranged. This is a member for preventing the electron beam from bending in an unfavorable direction due to the influence of unnecessary magnetism such as the earth's magnetism while traveling in the funnel 3, and is usually fixed to the frame 22. The prevention of the effect of unnecessary magnetism may be incomplete with only the internal magnetic shield. In such a case, an external magnetic shield 51 made of a metal having a high magnetic permeability may be provided outside the funnel 3 if necessary.

When viewed from the front, the panel 2 has a rectangular shape as shown in FIG. 3 (B). The area where the phosphor screen 10 is provided has a rectangular shape that is substantially similar to the panel 2. Here, for convenience of description, the long side direction of this rectangle is defined as x, and the direction perpendicular to this is defined as y.

FIG. 4 shows the relationship between each element of the CRT and the x and y directions. In the figure, (A) shows a part of the phosphor screen 10. The phosphor screen 10 is elongated and extends in a stripe shape substantially parallel to the y-direction. Each of the phosphor mosaics 11R, 11G and 11 emits red, green and blue light.
A non-light emitting layer 12 made of a black material is provided between the phosphor mosaics, which has a repeating pattern of B. (B) shows a part of the shadow mask 20. The electron beam passage holes 21 are individually elongated in the y direction.
The rows are connected to each other via bridges 23 in a direction to form a row, and a plurality of rows are arranged at substantially equal intervals in the x direction. (C) shows the arrangement of the electron gun 30. The electron gun 30 is composed of three unit electron guns 30B, 30G, and 30R arranged in a line in the x direction, each of which emits an electron beam to cause the phosphor mosaics 11B, 11G, and 11B to emit light.

FIG. 5 shows the deflection yoke 40. The deflection yoke 40 includes a core 41 made of a ferromagnetic tubular ferrite,
A pair of y coils 42Y wound inside thereof to generate a magnetic field for deflecting the electron beam in the y-direction, and a pair of windings wound inside thereof for deflecting the electron beam in the x-direction. x coil 42X. Although a winding method called a saddle shape is shown here, a winding method called a toroidal shape is generally known, and a toroidal shape not shown here is often used as the y coil 42Y. Has been.

When displaying an image, the x coil 42X
Is supplied with a deflection magnetic field generating current for causing the electron beam 100 to draw a scanning line in the x direction at a high repetition rate of 15 to 65 kilohertz per second, and the y coil 42Y also receives the electron beam 100 in the y direction at 60 hertz per second. A current is applied to generate a deflection field that reciprocates at a relatively slow repetition frequency of the order of magnitude. As shown in FIG. 5B, the x coil 42X is arranged inside the y coil 42Y. This is to reduce the volume of the space surrounded by the x-coil, increase the deflection sensitivity in the x-direction where the frequency is high, and reduce the load on the circuit as much as possible.

The deflection yoke 40 is a color cathode ray tube as shown in FIG.
However, due to manufacturing errors, the magnetic field distribution may differ from that initially planned, and unfavorable phenomena such as misconvergence and raster distortion may occur. In order to correct this error in the magnetic field distribution, a small piece of ferrite or a permanent magnet may be attached to a part of the x-coil 42X facing the tube wall of the color CRT 1 inside the deflection yoke 40.

This situation is shown in FIG. A small piece 43 of ferrite or a permanent magnet (hereinafter referred to as a magnetic piece for correction) is operated by attaching a color cathode ray tube to the deflection yoke and operating it. It is determined and then fixed with an adhesive or the like. In the figure, the deflection yoke 40 is temporarily removed from the color CRT 1 so that the inside can be seen from the front. This operation may be carried out by the deflection yoke manufacturing department in combination with a standard cathode ray tube, so to speak, as a part of the deflection yoke manufacturing process.

The correcting magnetic piece 43 is often made of an elastic plastic compound material commonly called rubber ferrite or a rubber magnet so as not to damage the outer wall of the color CRT 1. In addition, 40A in FIG. 6 is a plastic molding material used for maintaining the mutual positional relationship between the core 41 and the coils 42X and 42Y.
Illustration is omitted in FIG.

However, the color cathode ray tube device having such a structure has the following problems. One of them is the thermal deformation of the shadow mask due to the electron beam bombardment. FIG. 7 shows a typical phenomenon called doming. Now, for example, it is assumed that a particularly bright image is displayed only in the area indicated by 101 in the drawing. Then, only this portion has a higher electron beam density that flows in than the other portions, so that the corresponding portion of the shadow mask 20 has a higher temperature than the other portions and is deformed so as to locally bulge as shown by 20a. . This is called doming. As a result, the electron beam transmitting hole of the shadow mask is displaced from the predetermined position, so that the electron beam passing therethrough does not impinge on the correct position of the fluorescent screen 10, and as shown by 102 in FIG. It moves in the radial direction toward the center of the phosphor screen 10. For this reason, the electron beam no longer correctly strikes the predetermined phosphor mosaic 11, and a phenomenon called poor purity occurs. As is clear from the arrangement of the phosphor mosaic 11, this phenomenon tends to be prominent when | x | on the phosphor screen 10 is large.

Another problem of the above-described conventional color cathode ray tube device is deterioration of the focus of the electron beam. This will be described with reference to FIG. In the figure, (A)
Shows a cross section in the x direction including the central axis of the cathode ray tube, and (B) shows a cross section in the y direction. It should be noted that in these figures, members not necessary for the explanation are omitted.

In (A), three electron guns 30B, 3
Electron beam 100B emitted from 0G and 30R, 10
0G and 100R are made so as to concentrate at the center O of the panel 2 (convergence can be taken). Now, it is assumed that the deflection yoke produces a uniform and uniform magnetic field, and that the magnetic field deflects the electron beam in the x direction. The electron beam is bent near point S (referred to as the deflection center), which is the effective center of the deflection yoke, and travels in the direction of the panel 2. However, if the deflection magnetic field has a uniform distribution, it is C in front of the panel 2. Concentrate on points. In order to prevent this, it is known that the deflection magnetic field for deflecting the electron beam in the x direction has a pincushion distribution instead of a uniform distribution.

Even when the electron beam is deflected in the y direction as shown in (B), if the deflection magnetic field has a uniform distribution, the electron beam will be concentrated at C'in front of the panel 2 and will be erroneously displayed on the screen. Convergence will occur. For this reason, it is known that the deflection magnetic field for deflecting the electron beam in the y direction has a barrel distribution instead of a uniform distribution. Both C and C'draw a locus passing through the center of the inner surface of the panel 2, but C draws a circle with a radius L / 2 as shown in the figure by an approximate calculation omitting higher-order terms, and C'also has a radius L. Draw a circle. Here, L is the distance from the deflection center S to the panel inner surface center O.

This means that the misconvergence caused by the uniformly distributed deflection magnetic field is y in the case of deflection in the x direction (that is, the direction in which the three electron guns are arranged) even if the deflection angles are the same. It is shown to be considerably larger than in the case of direction deflection. In order to eliminate the above misconvergence, the deflection magnetic field has a pincushion distribution and a barrel distribution. If the pincushion degree and the barrel degree are expressed on the same scale (this expression method will not be described here). ) It can be seen that the degree of pincushion for deflection in the x direction must be considerably stronger (compared to absolute values) than the degree of barrel for deflection in the y direction.

By the way, it is not preferable in terms of convergence that the deflection magnetic field has a pincushion distribution or a barrel distribution. These magnetic field distributions give rise to a phenomenon called astigmatism to the electron beam, and give a magnification change effect accompanied by unfavorable anisotropy to the beam spot formed on the phosphor screen 10. Deteriorate image quality. That is, generally speaking (when comparing the same deflection angles), the focus of a point deflected in the direction in which the electron guns 30 on the screen are arranged (x direction) is the point deflected at a right angle (y direction). Worse than the focus. Moreover, as shown in FIG. 3, since the panel 2 has a rectangular shape elongated in the x direction, the maximum deflection angle is larger in the x direction than in the y direction, and a considerably poor focus portion appears at the end of the screen in the x direction. Specifically, at this portion, the electron beam spot becomes long in the x direction, and there was no easy method to save it.

In the conventional color cathode ray tube device, the xy dimension ratio (generally called the aspect ratio) of the rectangular screen, that is, the portion where the fluorescent screen 10 is provided, is usually 4: 3. However, in recent years, the 16: 9 type has become popular. This means that the phenomenon caused by the deflection in the x direction becomes more prominent than in the past, and the above-mentioned problem phenomenon has become more prominent as a drawback in the 16: 9 screen.

As a means for solving the above problems, for example, as shown in JP-A-3-261052, the extending direction of the phosphor mosaic and the longitudinal direction of the electron beam transmitting hole of the shadow mask are made parallel to the x direction, and A configuration has been devised in which the guns are arranged in a row parallel to the y-direction.

In this way, in the area of large | x | on the phosphor screen where the adverse effect of doming is most prominent in the past, even if deviation of the beam projecting point occurs, that direction (radial direction) is the phosphor mosaic. The angle formed with the arrangement direction is small, and the influence is greatly reduced from the viewpoint of the deviation (purity) between the electron beam projecting point and the predetermined phosphor mosaic. Of course, at this time, the adverse effect increases in a region where | y | on the phosphor screen is large, but doming is a problem at a large deflection angle, and it is not a problem as a whole because the deflection angle in the y direction is small. .

Further, with the above-mentioned structure, since the deflection angle is small at the portion (the end in the direction in which the electron guns are arranged) that causes the most focus problem that occurs in the conventional structure described above, the overall image quality is improved. Will be improved.

On the other hand, in this configuration, when an image in which the scanning lines are drawn in the x direction is output as in the conventional case, both of the scanning lines and the phosphor mosaic form an evenly spaced pattern parallel to the x direction. Therefore, there is also a problem that unsightly interference fringes called moire are generated on the screen.

As a countermeasure against this, a method of drawing a scanning line in the y direction can be considered. Since most display signal systems including conventional television systems are designed on the assumption that scanning lines are drawn in the x direction, it is almost always possible to use this color CRT device in a conventional signal system. To do so requires a signal converter with a large-scale memory. But recent advances in memory have made this possible.

By the way, in order to display an image having the same number of pixels as the conventional method by drawing the scanning lines in the y direction, the scanning line scanning frequency must be increased. For example, xy on the screen
If the scanning line scan is changed in the y direction while the same number of pixels and the same number of images per second are displayed for an image in which the dimension ratio is 4: 3 and the scanning line scan is performed at 15.75 kHz in the x direction, the frequency is 21 kHz. You have to do it. Also xy on the screen
If the scan line scan is performed at 33.75 kHz in the x direction and the image ratio is changed to the y scan in the y direction, the frequency reaches 60 kHz.

This increase in the scanning line scanning frequency is not so technically a big problem and can be sufficiently dealt with by design (the deflection angle in the y direction is small, so it may be easier than before). The increase causes a problem of increasing unnecessary radiation. It is said that this electrostatic field may affect the living body and is not preferable. In this way, the leakage electrostatic field generated around the cathode ray tube device becomes large.

[Problems to be Solved by the Invention]

A method of suppressing the leakage electrostatic field has been known even in the conventional cathode ray tube device. However, all of these were associated with higher costs, and they were the subject of continued research. However, with the change of the scanning line direction, there is an urgent need to solve this problem.

Further, in the structure in which the x-direction scanning coil of the deflection yoke 40 is firstly arranged inside the core, and further the y-direction scanning coil is further arranged inside thereof, there is a manufacturing error in the deflection yoke, so that local misconvergence or permanent It was found that the correction could not be done as expected even if a correction magnetic piece consisting of a small piece of magnet was attached as shown in FIG.

The present invention has been made in view of the above circumstances, and provides a structure in a cathode ray tube device in which a scanning line is drawn in the y direction, which does not cause an increase in the leakage electromagnetic field generated in the periphery thereof. It is a thing.

Another object of the present invention is to correct the deflection yoke when there is a manufacturing error and a small piece of rubber ferrite or permanent magnet is attached as shown in FIG. It is to provide a color cathode ray tube device having a structure that can be realized as desired.

[0031]

A color cathode ray tube device according to the present invention includes a panel having a rectangular phosphor screen, a funnel connected to the panel, a neck portion connected to the funnel, and a neck portion inside the neck portion. In a color cathode ray tube comprising a plurality of electron guns provided, and a deflection yoke attached in the vicinity of the connection between the funnel and neck of the color cathode ray tube,
The deflection yoke includes a cylindrical core, a first deflection coil to which a deflection current having a relatively low frequency is applied to deflect the electron beam from the electron gun, and a relatively high frequency to deflect the electron beam. A second deflection coil through which a low deflection current is applied, the second deflection coil being arranged inside the core, and the first deflection coil being further inside the second deflection coil. It is made in the configuration that is arranged.

In the above structure, a plurality of electron guns are arranged in a line parallel to the short side of the phosphor screen, and
This deflection coil deflects the electron beam at a relatively low frequency in the long side direction of the phosphor screen, and the second deflection coil deflects the electron beam at a relatively high frequency in the short side direction of the phosphor screen.

Also, this color cathode ray tube device is 4 to 3
Alternatively, a panel having a rectangular phosphor screen having an aspect ratio larger than that is scanned at a high frequency in the short side direction, and the deflection coil in the short side direction (second deflection coil) is changed to the long side deflection coil. It is arranged outside the (first deflection coil).

Further, a magnetic piece for correcting the deflection magnetic field is attached to a portion facing the color cathode ray tube inside the first deflection coil.

Furthermore, a conductive film for grounding is provided on almost the entire outer surface of the core of the deflection yoke.

[0036]

In the color cathode ray tube device according to the present invention, the second deflection coil through which the high-frequency deflection current flows is arranged between the core of the yoke and the first deflection coil through which the low-frequency deflection current flows. Therefore, it is possible to suppress the leakage of the electrostatic field generated from the second deflection coil through which the high-frequency deflection current flows.

Further, since the first deflection coil (x coil) having a large deflection angle is arranged at the innermost side, when there is a manufacturing error or when it is difficult to realize the designed magnetic field distribution by winding, The resulting local inconvenience of convergence and raster distortion can be easily and effectively corrected by attaching the correction magnetic piece.

[0038]

【Example】

Example 1. FIG. 1 shows an embodiment of the present invention. In the figure, the phosphor screen 10 has a substantially rectangular outer shape that is long in the x direction. The ratio of the dimension in the x direction to the dimension in the y direction of the phosphor screen 10 is 4: 3 or larger, usually 16: 9. The phosphor screen 10 is composed of an assembly of elongated phosphor mosaics 11, and the shadow mask 20 has elongated electron beam transmission holes 21, whose longitudinal directions are substantially parallel to the x direction. The electron gun 30 includes three unit electron guns 30B and 3B.
0G and 30R (the order does not necessarily have to be as shown in the figure), and these three lines are arranged in a line in the y direction.

The deflection yoke 40 includes a cylindrical core 41, a saddle type y coil 42Y (second deflection coil) arranged inside the core 41, and a saddle type x coil 42X (which is further arranged inside thereof). A first deflection coil). x
A deflection current having a relatively low frequency for scanning the electron beam in the x direction, usually around 60 hertz, is applied to the coil 42X, and a y coil 42Y has a relatively low frequency for scanning the electron beam in the y direction. High, usually 15 to 65
A deflection current of kilohertz is applied.

A partially cutaway front view of the deflection yoke 40 is shown in FIG. If the deflection yoke 40 has a manufacturing error,
To correct this effect, the x-coil 42
A modification made of a material having a high magnetic permeability such as ferrite or a small piece of a permanent magnet having a high coercive force inside the X, that is, a portion facing the tube wall including the funnel 3 and the neck portion 4 when attached to the color CRT 1. The magnetic piece 43 is attached with an adhesive or the like. These correction magnetic pieces 43 are preferably made of an elastic plastic compound material so as not to damage the tube wall of the color CRT 1.

Next, the reason why the above configuration is effective in solving the problem will be described. When this color CRT device is operated, y
A high voltage pulse is applied to the coil 42Y in order to realize a fast current change during the blanking period, and as a result, an electrostatic field composed of the scanning frequency or its harmonic components is generated. However, according to the configuration of the present invention, the y coil 42Y through which the high-frequency scanning current flows is arranged between the core 41 and the x coil 42X. Since the core 41 is made of a material having a high magnetic permeability, it has a shielding action against an electrostatic field that changes with time, and leakage of the electrostatic field to the outside of the coil is considerably prevented. Also x
Since the coil 42X is for performing scanning at a low frequency, a high pulsating voltage is not applied, and the y coil 4X
Since the impedance of the frequency component applied to 2Y can be made relatively low with respect to the ground, leakage of the electrostatic field from the inside of the coil can be prevented.

If the inner and outer relations of the coils 42X and 42Y are reversed, the leakage of the electrostatic field from the outside of the coil 42Y can be prevented, but the inside of the coil 42Y faces the color cathode-ray tube 1 and therefore the potential of the coil is reduced. The fluctuation leaks to the outside of the cathode ray tube through a conductive film (not shown) on the inner surface of the funnel due to electrostatic coupling. Therefore, some measures are required depending on the regulation situation. This phenomenon is caused by the fact that the y direction, which has a small dimension of the phosphor screen 10, is set as the high-speed scanning direction. Is caused by an increase in the vertical and horizontal dimensions and the screen becomes horizontally long, the frequency of the y-direction scanning becomes even higher, which causes a further problem.

In this embodiment, the leakage of the electrostatic field from the outside of the y coil 42Y is suppressed by the core 41. However, the core 41 has a conductive characteristic almost similar to an insulator, and its magnetic permeability is infinite. Therefore, there is a limit to the shield even though the electrostatic field changes with time. In such a case, if necessary, a conductive film made of metal foil or paint may be provided on the substantially entire outer surface of the core 41, and this may be connected to the ground.

Even if the above measures are taken, it may be necessary to use the conventionally known measures against electrostatic field in combination depending on the regulation situation. However, even in that case, the degree of the countermeasure, and thus the cost, is small in the case of implementing the present invention.

The structure of the present invention is also useful for easily and effectively correcting a manufacturing error in the coil by attaching the correcting magnetic piece 43. Generally, both the x and y coils are required to have a small manufacturing error, but when comparing both, the demand for the x coil having a large deflection angle is more severe. Therefore, correction is more necessary for errors due to the x coil than for the y coil. On the other hand, the manufacturing error of the coil to be corrected using the sticking of the correction magnetic piece 43 as described here is a local winding placement error and appears locally on the screen. Therefore, for correction, it is better to dispose the x coil inside so that the magnetic correction piece 43 can be directly attached to the x coil.

On the contrary, if the y-coil is arranged inside, the correction can be done only inside the exposed y-coil even though the necessary correction is local to the x-coil. The piece and the problematic part of the coil are separated. As a result, it becomes difficult to make local corrections, and even if a small and sufficiently strong correction magnetic piece can be used, there are more cases where the correction amount is too small or the correction range is too wide. It ends up.
Arranging the x-coil having a large deflection angle inside as described above greatly contributes to productivity when correction of an error is considered.

The correction of the error is not limited to simply attaching the magnetic pieces for correction, and the same can be said when directly correcting the coil winding (arrangement of copper wires) by an appropriate method. In other words, the coil having a high degree of correction is on the inner side, and even after the coil is assembled as the deflection yoke, the coil having the larger deflection angle can be observed and the work is easy.

The attachment of the magnetic piece for the purpose of correcting the error has been described above. In this case, the type of adhesive material,
The position and number are unspecified. Depending on the design of the deflection yoke, it is difficult to machine a winding that realizes the designed magnetic field distribution in terms of machining technology, and this is often compensated for by attaching a correction magnetic piece. Also in this case, it is often advantageous to directly attach the coil having the larger deflection angle. In the case of such a design attachment, there is a feature that the type, position and number of attachment materials are constant for products of the same model name.
The present invention is also effective in providing such an effect.

In the embodiment described above, the phosphor mosaic 1
1 and the electron beam transmission hole 21 of the shadow mask are elongated. However, circular CRTs are also known. If the phosphor mosaic is circular,
The image quality of the projected image is unique and often preferred for displays with many line drawings. In such a case, it is uneconomical to completely redesign the color cathode ray tube device. Therefore, it is necessary to redesign only the shadow mask and the fluorescent screen portion of the cathode ray tube having the stripe type mosaic whose longitudinal direction coincides with the x direction. It is also possible to make a color cathode-ray tube device with a circular mosaic. In this way, when making a display monitor using this color CRT device, a circular mosaic color CRT can be conveniently used without making any changes to the circuit. Even in this case, the effect of the present invention can be exerted in the same manner, and the present invention can be applied to the phosphor mosaic which is not rectangular or striped.

[0050]

As described above, the color cathode ray tube device according to the present invention performs a fluorescent screen having a rectangular outer shape elongated in the x direction, a plurality of electron guns, a low speed scanning in the x direction and a high speed scanning in the y direction. Since the y coil for high-speed scanning is arranged inside the core and the x coil for low-speed scanning is arranged inside the deflection yoke, the electrostatic field generated in the surroundings can be reduced.

Further, since the x coil having a large deflection angle is arranged on the side (inner side) close to the neck portion of the color cathode ray tube, it is easy to correct the manufacturing error or the like by attaching the correcting magnetic piece or directly processing the coil winding. Therefore, it is possible to provide a color CRT device with excellent performance at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a color cathode ray tube device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of a deflection yoke used in the first embodiment.

FIG. 3 is a partial cross-sectional view and front view of a conventional color CRT device.

FIG. 4 is a partially enlarged view of a fluorescent screen and a shadow mask of a conventional color cathode ray tube device and a sectional view showing an electron gun arrangement.

FIG. 5 is an external perspective view and a sectional view of a deflection yoke used in a conventional color cathode ray tube device.

6 is a front view of the deflection yoke of FIG.

FIG. 7 is a diagram illustrating doming which is a problem in a color cathode ray tube device.

FIG. 8 is a diagram illustrating a deflection aberration which is a problem in a color cathode ray tube device.

[Explanation of symbols]

 1 Color Braun Tube 2 Panel 3 Funnel 4 Neck Part 10 Fluorescent Surface 11 Fluorescent Mosaic 11R Fluorescent Mosaic 11G Fluorescent Mosaic 11B Fluorescent Mosaic 20 Shadow Mask 21 Electron Beam Transmission Hole 22 Frame 23 Bridge 30 Electron Gun 30R Electron Gun 30G Electron Gun 30B Electron gun 40 Deflection yoke 41 Core 42 X coil 42 Y coil 43 Magnetic piece for correction

Claims (6)

[Claims] 1. A color CRT comprising a panel having a rectangular phosphor screen, a funnel connected to the panel, a neck connected to the funnel, and a plurality of electron guns provided in the neck. And a color cathode ray tube device having a deflection yoke attached near the connection between the funnel and the neck portion of the color cathode ray tube, the deflection yoke for deflecting an electron beam from the tubular core and the electron gun. A first deflection coil through which a deflection current having a relatively low frequency is supplied, and a second deflection coil through which a deflection current having a relatively high frequency for deflecting the electron beam is supplied. The deflection coil is arranged inside the core, and the first deflection coil is arranged further inside the second deflection coil. Color cathode ray tube device. 2. Among x and y2 directions which are orthogonal to each other, x
Color consisting of a panel having a rectangular phosphor screen with long sides in the direction, a funnel connected to this panel, a neck connected to this funnel, and a plurality of electron guns provided in this neck. In a color cathode ray tube device including a cathode ray tube and a deflection yoke attached near the connection between the funnel and the neck portion of the color cathode ray tube, the plurality of electron guns are arranged in one row in the y direction, and the deflection yoke is provided. Is a cylindrical core, a first deflection coil (x coil) to which a deflection current having a relatively low frequency is applied to deflect the electron beam from the electron gun in the x direction, and the electron beam in the y direction. A second deflection coil (y-coil) through which a deflection current having a relatively high frequency is applied to deflect the second deflection coil inside the core. Is location and color cathode ray tube apparatus characterized by the first deflection coils are located further inside of the second deflection coil. 3. The phosphor screen is composed of an assembly of rectangular phosphor mosaics, and the longitudinal direction of the rectangular phosphor mosaic is substantially parallel to the long side (x direction) of the phosphor screen. The color CRT device according to claim 1 or 2. 4. The color cathode ray tube device according to claim 1, wherein a magnetic piece for correcting the deflection magnetic field is attached to a portion facing the color cathode ray tube inside the first deflection coil. 5. The dimension in the x direction of the rectangular phosphor screen is
The color cathode ray tube device according to claim 1 or 2, wherein when the dimension in the y direction is 3, it is 4 or more. 6. The color CRT device according to claim 1, wherein a conductive film for grounding is provided on substantially the entire outer surface of the core of the deflection yoke.