JP2002025471A - Color cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct for the uneven distortion at the top and bottom sections of the screen that appears at the installation process of fixing the deflection yoke by inserting to the neck, while the deflection yoke is at the fixed stage, and facilitates the installation work. SOLUTION: Solenoid coils 3, 4 are supported, in parallel with the horizontal direction of the screen by the support members 5, 6 which is set from the periphery face of the front separator 2a at the upper and lower sections of the deflection yoke 2, and a prescribed direct current is made to flow to each solenoid, and the distortion at the upper and the lower sections of the screen is corrected.

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, and more particularly to a color cathode ray tube device provided with a means for correcting screen distortion of a display screen of a color cathode ray tube.

[0002]

2. Description of the Related Art FIG. 4A is a configuration diagram schematically showing a configuration of a conventional general color cathode ray tube. In the figure,
The color cathode ray tube 50 includes a panel section 51 and a funnel section 5.
2, a panel 53, a funnel 52, and an outer shell of the neck 53 are integrally formed, and the deflection yoke 54 is provided with a funnel 52.
It is arranged so as to cover the outer peripheral surface from the to the neck portion 53.

In a color cathode ray tube, a neck portion 53 is provided.
Is provided with an electron gun 55 for generating three electron beams 56, and the panel portion 51 is coated with phosphors emitting red, green and blue in the form of vertical stripes as shown in FIG. A vertical stripe phosphor 57 having a fluorescent surface, and a shadow mask 58 located in the vicinity of the electron gun 55 and selectively projecting the three electron beams 56 from the electron gun 55 onto the vertical stripe phosphor 57, The panel 51 is disposed so as to be substantially parallel to the front surface 51a.

Further, an internal conductive film (not shown) is formed inside a part of the funnel portion 3 and the neck portion 4, and a high voltage is applied to the outside of the funnel portion 3 in the color cathode ray tube. An anode button 59 is formed.
In the figure, the arrow A points upward in the vertical direction, which is the vertical direction of the panel front surface 51a.

FIG. 5 is a schematic perspective view of the deflection yoke 54. The deflection yoke 54 has a hollow frustoconical body 5.
A horizontal deflection coil 60 for deflecting the electron beam in the horizontal direction on the left and right sides of the screen, having a shape formed of a front separator portion 54a and a rear separator portion 54b formed in the shape of a flange at the periphery of both openings. And a vertical deflection coil 61 for deflecting the electron beam in the vertical direction above and below the screen. It should be noted that the deflection yoke 54 in the figure is drawn in a positional relationship in which the arrow A in the figure indicates the same direction as the arrow A in FIG.

FIG. 6A is a schematic view showing a closed path of the horizontal deflection coil 60 constituting the deflection yoke 54 (FIG. 5), and includes a central axis 100 of the deflection yoke 54 and a horizontal line 101 orthogonal thereto. It comprises a pair of closed circuits 62 and 63 formed symmetrically with respect to a horizontal plane. The closed path 62 includes a pair of straight portions 62a and 62b along the body portion 54c of the deflection yoke 54 (FIG. 5), an arc portion 62c formed along the front separator portion 54a and connected to both straight portions, and a rear separator. An arc portion 62d is formed along the portion 54b and connected to both straight portions.

The closed path 63 also includes a pair of straight portions 63a, 63b along the body portion 54c of the deflection yoke 54 (FIG. 5), an arc portion 63c formed along the front separator portion 54a and connected to both straight portions, And an arc portion 63d formed along the rear separator portion 54b and connected to both straight portions.

A current in the same direction is appropriately supplied to each of the closed paths 62 and 63 to form a magnetic field substantially perpendicular to the virtual horizontal plane, so that the electron beam passing through the closed paths 62 and 63 is moved in the horizontal direction of the screen by the arrow C. Or, it is deflected in the D direction.

On the other hand, FIG. 6B is a schematic diagram showing a closed path of the vertical deflection coil 61 constituting the deflection yoke 54 (FIG. 5). The center axis 100 of the deflection yoke 54 and a vertical line 102 orthogonal to the center axis 100 are shown in FIG. And a pair of closed circuits 64 and 65 formed in plane symmetry so as to sandwich the virtual vertical plane including. Closing 64
Are a pair of straight portions 64a, 64b along the body portion 54c of the deflection yoke 54 (FIG. 5), an arc portion 64c formed along the front separator portion 54a and connected to both straight portions, and a rear separator portion 54b. And an arc portion 64d connected to both straight portions.

The closed path 65 is also formed by a pair of straight portions 65a and 65b along the body portion 54c of the deflection yoke 54 (FIG. 5), an arc portion 65c formed along the front separator portion 54a and connected to both straight portions, and An arc portion 65d is formed along the rear separator portion 54b and connected to both straight portions.
A current in the same direction is appropriately supplied to each of these closed paths 64 and 65 to form a magnetic field substantially perpendicular to the virtual vertical plane, so that the electron beam passing through the inside of the closed paths 64 and 65 is directed to an arrow A or B in the vertical direction of the screen. Deflection in the direction.

The front separator 5 of the deflection yoke 54
Permanent magnets 70 and 71 (FIG. 5) for distortion correction are provided on the upper and lower portions of the peripheral surface of 4a as described later.

The operation of the thus constructed color cathode ray tube when an electron beam is being generated will be described. As shown in FIG. 4, the electron gun 5 in the neck 53
5, the three electron beams 56 are emitted from the deflection yoke 54.
Are electromagnetically deflected in the vertical direction (directions of arrows A and B) and in the horizontal direction (directions of arrows D and C in FIG. 5) corresponding to the vertical direction of the paper surface, and pass through a hole formed in the shadow mask 58, and the vertical stripe phosphor is used. By hitting 57, an image can be projected on the entire predetermined screen area of the panel front surface 51a.

At this time, the electron beam 56 is applied to the deflection yoke 5
The deflection amount is determined according to the drive current applied to each of the deflection coils 60 and 61 of No. 4. Now, consider a case in which the electron beam is deflected and scanned with the maximum value of the current applied to the horizontal deflection coil 60 and the maximum value of the current applied to the vertical deflection coil 61 kept constant.

FIG. 7 shows a state of a screen 75 projected on the front surface 51a of the panel at this time. As shown in FIG.
5 generates a concave screen distortion whose outer periphery, which should preferably be rectangular, is concavely curved on the left and right short sides and the upper and lower long sides, respectively. This distortion occurs because the four corners of the screen are farther from the electron gun than at the center of the screen, and is generally called pincushion distortion.

In a normal use state, the image projected on the front surface 51a of the panel of the color cathode ray tube 50 (FIG. 4) is
It is necessary that the screen 75 (FIG. 7) be displayed so as to fit in a predetermined rectangular image frame, and therefore, the screen distortion is corrected.

In FIG. 7, concave screen distortion on the left and right sides of the screen, indicated by curved lines 75a and 75b, causes the drive current flowing through the horizontal deflection coil 60 of the deflection yoke 54 when the color cathode ray tube 50 is operated to fluctuate periodically. Can be corrected. However, if it is attempted to correct the concave screen distortion above and below the screen indicated by the curved lines 75c and 75d in a similar circuit operation manner, the fluctuation frequency applied to the drive current flowing through the vertical deflection coil 61 of the deflection yoke 54 is high. Therefore, it is difficult to perform correction by this method.

For the above reason, in order to correct the concave screen distortion on the upper and lower sides of the screen, the permanent magnets 70 and 71 having the strength corresponding to the correction amount are provided by the front separator 54a of the deflection yoke 54.
Are arranged at the upper and lower portions of the peripheral surface.

FIG. 8A illustrates the principle of correcting the concave screen distortion indicated by the upper curved line 75c by the permanent magnet 70.
FIG. 3 is a principle diagram when viewed from a direction. On the other hand, FIG.
FIG. 9 is a principle diagram when the vicinity of the permanent magnet 71 is viewed from the direction of the arrow G (FIG. 5) in order to explain the principle of correcting the concave screen distortion indicated by the downward curved line 75d by the permanent magnet 71.

As shown in FIG. 8A, the permanent magnet 70
Are arranged so that the N pole is positioned in the direction of arrow D. A magnetic field H5 in the direction of arrow C is formed in a predetermined area below the permanent magnet 70, and the magnetic field H5 is moved from the back of the paper to the front. A force F in the direction of arrow A is applied to the electron beam 56 to correct the concave screen distortion indicated by the upper curved line 75c.

On the other hand, as shown in FIG. 8B, the permanent magnet 71 is disposed so that the N pole is located in the direction of arrow C. In a predetermined region above the permanent magnet 71, the arrow D A magnetic field H6 in the direction is formed, and a force F in the direction of arrow B is applied to the electron beam 56 moving so as to be exposed from the back of the drawing to correct the concave screen distortion indicated by the downward curved line 75c. By performing such a distortion correction, the screen 75 has a shape conforming to a predetermined rectangular image frame as shown in FIG.

When assembling the color cathode ray tube 50 (FIG. 4) for correcting the concave screen distortion by the above configuration, the deflection yoke 54 is attached to the neck 53 and fixed to the outer peripheral surface applied to the funnel 52. In the attachment process, depending on the relationship with other characteristics, the attachment may be slightly inclined in the arrow J or K direction with respect to the reference position within the adjustment range of the attachment position.

In this case, when the screen 75 is inclined in the direction of arrow J, that is, when the front separator 54a is tilted above the standard with respect to the rear separator 54b, the screen 75 should be originally rectangular as shown in FIG. The outer periphery generates a screen distortion curved in a concave shape and a convex shape on the upper and lower long sides, respectively.

Conversely, the direction of arrow K, ie, the front separator 54
When a is tilted below the standard with respect to the rear separator portion 54b, the screen 75 is displayed as shown in FIG.
The outer periphery, which should be a rectangle, generates a convex and concave curved screen distortion on the upper and lower long sides, respectively.

[0024]

Normally, when the above-described deflection yoke is mounted, it is basically necessary to balance the vertical distortion of the screen in a well-balanced manner. Distortions as shown in FIGS. In the above-described conventional color cathode ray tube, it is difficult to correct the distortion of the screen generated at the time of assembling after the attaching process in which the deflection yoke is fixed.

In the work of attaching the deflection yoke, the distortion amount of the unevenness generated on the screen at this time should be 1 mm.
The following mounting accuracy may be required, and considerable skill is required for adjustment during mounting.

An object of the present invention is to provide a color cathode ray tube apparatus which can correct a screen distortion even after the deflection yoke mounting process without requiring excessive skill in the operation of mounting the deflection yoke.

[0027]

According to the present invention, a neck portion having an electron gun for generating three electron beams therein, a shadow mask, and a phosphor layer emitting red, green, and blue light are formed in a vertical stripe shape. A panel having the formed vertical stripe phosphor, a funnel located between the panel and the neck, and a part fitted to the neck and arranged to cover a part of the peripheral surface of the neck. A color cathode ray tube having a deflection yoke for deflecting the electron beam in the horizontal direction and the vertical direction, and a central axis of the color cathode ray tube in the vicinity of the opening on the panel portion side of the deflection yoke, It has a pair of solenoid coils disposed symmetrically with respect to the tube axis and substantially parallel to the horizontal direction, and a power supply for supplying a predetermined DC current to each of the solenoid coils.

Further, the pair of solenoid coils may be supported by a support member standing from a peripheral surface of a front separator formed around the opening.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram showing a configuration of a color cathode ray tube device 1 according to a first embodiment of the present invention. In the figure, components common to those of the color cathode ray tube 50 of FIG. 4 shown as a conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

A pair of solenoid coils 3 and 4 supported by supporting members 5 and 6 are disposed on upper and lower peripheral surfaces of the front separator 2a of the deflection yoke 2, respectively. These solenoid coils are formed symmetrically with respect to the tube axis (center axis) 100 of the color cathode ray tube 10, and are main part perspective views of the solenoid coil 3 viewed from obliquely above the rear part of the color cathode ray tube 10. FIG. The configuration will be described with reference to FIG.

As shown in FIG. 1 and FIG.
Is planted from the peripheral surface of the front separator 2a of the deflection yoke 2 and the solenoid coil 3 is positioned above the deflection yoke 2 so that its center axis 101 is aligned with the tube axis 100 and the screen (panel front face 51).
a) are supported in directions perpendicular to the vertical directions (directions of arrows A and B). Also, the support member 6 (FIG. 1)
Similarly, the solenoid coil 4 is supported below the deflection yoke 2 in parallel with the solenoid coil 3.

Each of the solenoid coils 3, 4 is connected to a constant current source 7, 8 via a lead wire 3a, 4a, respectively, and is configured such that a predetermined DC current flows through each solenoid coil as described later. ing.

The operation of the apparatus of the present invention in the above configuration will be described. FIG. 3A shows the upper curved lines 75c and 75f shown in FIG. 10 or FIG.
FIG. 3 is a principle diagram when the vicinity of a solenoid coil 3 is viewed from the direction of arrow G in FIG. 1 for explaining the principle of correcting the uneven screen distortion shown by. On the other hand, FIG. 3B shows the vicinity of the solenoid coil 4 in order to explain the principle of using the solenoid coil 4 to correct the uneven screen distortion shown by the lower curved lines 75e and 75d shown in FIG. 10 or FIG. FIG. 2 is a principle diagram when viewed from an arrow G direction in FIG. 1.

When assembling the color cathode ray tube device 1, the deflection yoke 2 is mounted on the neck 53 and the funnel 52
The case where the screen distortion as shown in FIG. 10 occurs at the stage when the attaching process for fixing to the outer peripheral surface subjected to the above is completed will be described.

At this time, as shown in FIG.
As shown in (a), a current is applied in a direction in which a magnetic field H1 in the direction of arrow D is generated on the central axis, and the electron beam 5 is moved below the paper so as to be exposed from the back of the paper.
6, a force F in the direction of arrow A is urged to correct the concave screen distortion indicated by the upward curved line 75c.

Similarly, the solenoid coil 4 is
As shown in (b), a current is applied in the direction in which a magnetic field H2 in the direction of arrow D is generated on the central axis, and a force F in the direction of arrow A is applied to the electron beam 56 that moves above the paper so as to be exposed from the back of the paper. The bias is applied to correct the convex screen distortion indicated by the lower curve line 75e.

Since the color cathode ray tube 10 here uses the vertical stripe phosphor 57 (FIG. 1) having a vertical stripe phosphor screen structure, the electron beam passing through the hole of the shadow mask 58 moves vertically. Is corrected, no color shift occurs.

As described above, the method of correcting the distortion in the case where the screen distortion as shown in FIG. 10 has occurred after the process of attaching the deflection yoke 2 is completed has been described. However, as shown in FIG. 10 can be dealt with by setting the direction of the current flowing through each of the solenoid coils 3 and 4 in the opposite direction.

As described above, Embodiment 1 according to the present invention
According to the color cathode ray tube described above, uneven screen distortion generated at the upper and lower portions of the screen can be corrected by flowing a DC current according to the shape of the distortion to each solenoid coil.

In the above-described embodiment, as shown in FIG. 10 or FIG. 11, an example in which the same level of distortion is corrected in the same direction at the top and bottom of the screen has been described, but the present invention is not limited to this. Instead, even when the distortions in the upper and lower portions of the screen are in the opposite directions or the degree thereof is different, these screen distortions can be corrected by setting the DC current value according to each state. Therefore, the permanent magnets 70 and 71 disposed on the upper and lower peripheral surfaces of the front separator portion 54a can be omitted.

Further, it is possible to change the range of the magnetic field acting on the electron beam by changing the length of the solenoid coil in the axial direction. In this case, it is possible to cope with color cathode ray tubes having different sizes. And various aspects can be taken.

In the claims and the description of the embodiments, “up”, “down”, “front”,
Although words such as "after" are used for convenience, they do not limit the absolute positional relationship in the state where the color cathode ray tube device is arranged.

[0043]

According to the color cathode ray tube device of the present invention,
Even after the deflection yoke mounting process, by appropriately setting the current value flowing through the solenoid coil, it is possible to easily and freely correct the distortion of the screen generated at the top and bottom of the screen. Is not required, and distortion correction can be realized with high accuracy.

[Brief description of the drawings]

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

FIG. 2 is a perspective view for explaining a configuration of a solenoid coil 3;

FIG. 3A is a principle diagram for explaining a principle of correcting a screen distortion by a solenoid coil 3;
FIG. 3B is a principle diagram for explaining the principle of correcting the screen distortion by the solenoid coil 4.

FIG. 4A is a configuration diagram schematically showing a configuration of a conventional general color cathode ray tube, and FIG. 4B is a diagram showing a fluorescent screen coated in a vertical stripe of a vertical stripe light emitting body 57; FIG.

FIG. 5 is a schematic perspective view of a deflection yoke.

6A is a schematic diagram showing a closed path of a horizontal deflection coil 60, and FIG. 6B is a schematic view showing a closed path of a vertical deflection coil 61. FIG.

FIG. 7 is a diagram showing a state of a screen 75 projected on the front surface 51a of the panel without distortion correction.

FIG. 8A is a principle diagram for explaining a principle of correcting a screen distortion by a permanent magnet 70, and FIG.
FIG. 4 is a principle diagram for explaining a principle of correcting a screen distortion by a permanent magnet 71.

FIG. 9 is a diagram showing a shape in which screen distortion has been corrected and which fits a predetermined rectangular image frame.

FIG. 10 is a diagram for explaining a screen distortion caused by attaching a deflection yoke.

FIG. 11 is a diagram provided to explain a screen distortion caused by attaching a deflection yoke.

[Explanation of symbols]

1 color cathode ray tube, 2 deflection yoke, 2a front separator, 2b rear separator, 3,4 solenoid coil, 3a, 4a lead wire, 5,6 support member, 7,8 constant current source, 50 color cathode ray tube,
51 panel section, 51a panel front face, 52 funnel section, 53 neck section, 54 deflection yoke, 5
4a front separator, 54b rear separator,
55 electron gun, 56 electron beam, 57 vertical stripe phosphor, 58 shadow mask, 59 anode button,
60 horizontal deflection coil, 61 vertical deflection coil, 6
2 closed circuit, 62a, 62b linear part, 62c circular arc part, 63 closed circuit, 63a, 63b linear part, 63c
Arc part, 64 closed path, 64a, 64b linear part,
64c arc, 65 closed, 65a, 65b
Linear part, 65c arc part, 70, 71 permanent magnet,
75 screens.

Claims (2)

[Claims] 1. A neck portion having an electron gun for generating three electron beams therein, a shadow mask, and red, green,
A panel portion having a vertical stripe phosphor in which a phosphor layer emitting blue light is formed in a vertical stripe shape, a funnel portion located between the panel portion and the neck portion, and a neck portion fitted to the neck portion. A color cathode ray tube, which is provided so as to partially cover the peripheral surface, and has a deflection yoke for deflecting the electron beam in a horizontal direction and a vertical direction; and a color cathode ray tube in the vicinity of the panel portion side opening of the deflection yoke. hand,
A pair of solenoid coils whose central axes are arranged symmetrically with respect to the tube axis of the color cathode ray tube and substantially parallel to the horizontal direction, and a power supply for supplying a predetermined direct current to each of the solenoid coils A color cathode ray tube device comprising: 2. The color cathode ray tube device according to claim 1, wherein the pair of solenoid coils are supported by a support member that stands from a peripheral surface of a front separator formed around the opening.