JPH1031965A - Color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the horizontal misconvergence by providing a convergence means for preventing the misconvergence on both end parts of the large diameter arc part of a saddle type coil. SOLUTION: Since a convergence means 22 for preventing horizontal miss convergence are provided on both end parts of a large diameter arc part 21, horizontal miss convergence can be prevented. Namely, the convergence means 22 has dent parts 23a, 23b to a small arc part 19 side on both end parts of the large diameter arc part, and the length L2 of the opening part of a corn part 20 is set larger than the length L1 between both end parts of the corn part 20. Thus, ten pin cushion magnetic field component of the notched parts 23a, 23b of the large diameter arc part 21 is lowered, and a new magnetic field is generated in the corn part area of the opening part longer than L1 between both end parts 20a of the corn part 20, the horizontal miss convergence can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube device used for a television or a display.

[0002]

2. Description of the Related Art In a conventional color picture tube apparatus equipped with an in-line electron gun, when blue and red lines are projected on a phosphor screen, a horizontal axis misconvergence as shown in FIG. 8 occurs. That is, in the middle area L occupying about 1/2 of the effective size in the vertical direction of the phosphor screen, the blue lines 1B and 3B in the first and third quadrants are moved upward from the red lines 1R and 3R, and then to the second A horizontal axis misconvergence occurs in which the blue lines 2B and 4B in the fourth quadrant are displaced obliquely below the red lines 2R and 4R.

Therefore, a conventional color picture tube apparatus is shown in FIG.
The vertical deflection coil of the deflection device is divided into two pairs of a coil part for generating a pincushion magnetic field and a coil part for generating a barrel magnetic field in order to reduce the horizontal axis misconvergence as shown in FIG. Wound, and
One set of coil portions of a vertical deflection coil connects two diodes connected in parallel with opposite polarities in series (Japanese Patent Laid-Open No. 64-84549).

[0004]

However, in such a conventional color picture tube device, a diode is used in a convergence correction circuit around the deflection device.
The temperature of the diode rises as the temperature of the deflecting device rises. As a result, there is a problem that the convergence performance of the diode decreases and the image quality deteriorates.

The present invention eliminates electronic components such as diodes, thermistors, and resistors in a convergence correction circuit,
An object of the present invention is to provide a color picture tube device capable of reducing misconvergence.

[0006]

According to the present invention, there is provided a color picture tube apparatus comprising: a glass bulb having a fluorescent screen surface on an inner surface thereof; and an in-line electron gun disposed in the glass bulb for irradiating the fluorescent screen surface with an electron beam. And a color picture tube device having a deflection device having a horizontal deflection coil and a vertical deflection coil disposed outside the glass bulb, wherein the vertical deflection coil is a pair of saddle type coils opposed to each other via the glass bulb. The saddle-shaped coil is composed of a small-diameter arc portion, a cone portion having an opening in the center, and a large-diameter arc portion formed sequentially in a direction in which the electron beam is irradiated, and both ends of the large-diameter arc portion. Provided with convergence means for preventing misconvergence.

[0007] With this configuration, misconvergence of the horizontal axis can be prevented. Further, in the color picture tube device of the present invention, the convergence means has a digging portion toward the small-diameter arc portion at both ends of the large-diameter arc portion, and in the tube axis direction of the glass bulb, The length of the cone on the opening side is longer than the length of both ends of the cone.

According to this configuration, the pincushion magnetic field component at the dug portions at both ends of the large-diameter arc portion is reduced, and the cone region on the opening side longer than the length of both ends of the cone portion is provided.
Since a new magnetic field is generated, the misconvergence on the horizontal axis can be reduced, and further, electronic components such as diodes of the convergence correction circuit, which have been required conventionally, can be eliminated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, a color picture tube device according to an embodiment of the present invention includes a glass bulb 3 having three color fluorescent screen surfaces 2 for emitting blue, green, and red light on an inner surface of a front panel 1. A shadow mask 4 disposed opposite the fluorescent screen surface 2, an in-line electron gun 7 disposed in the neck portion 5 of the glass bulb 3 and irradiating the fluorescent screen surface 2 with an electron beam 6, and a funnel portion of the glass bulb 3 8 and a deflecting device 9 mounted on the outside of the neck portion 5, and two-pole magnets 10, 4 mounted on the outside of the neck portion 5 for adjusting purity and static convergence.
A convergence unit 13 having a pole magnet 11 and a six-pole magnet 12 is provided.

As shown in FIG. 5, the deflection device 9 includes a horizontal deflection coil (not shown) for generating a pincushion magnetic field inside the resin frame 14 and a barrel magnetic field outside the resin frame 14. And a ferrite core 17 for strengthening the magnetic flux is mounted on the outer periphery of the vertical deflection coil 16.

As shown in FIGS. 1, 2 and 3, the vertical deflection coil 16 comprises a pair of saddle type coils 18a and 18b opposed to each other with the glass bulb 3 interposed therebetween. A small-diameter arc portion 19, a cone portion 20 having an opening 17 in the center, and a large-diameter arc portion 21 which are sequentially formed in the direction in which the electron beam 6 is irradiated. 21
b has convergence means 22 for preventing misconvergence on the horizontal axis. The convergence means 22
Both ends 21a, 21b of the large-diameter arc portion 21 have dug portions 23a, 23b to the small-diameter arc portion 19 side, and both ends 2 of the cone portion 20 in the tube axis X direction of the glass bulb 3.
The length L2 of the cone portion 20 on the opening 17 side is longer than the length L1 of Oa.

Next, the operation and effect of the color picture tube device will be described. In the embodiment of the present invention, since the convergence means 22 for preventing the horizontal axis misconvergence is provided at both ends 21a and 21b of the large-diameter arc portion 21, the horizontal axis misconvergence is prevented as shown in FIG. can do. That is, convergence means 2
2 has both ends 21a and 21b of the large-diameter arc portion 21 with dug portions 23a and 23b to the small-diameter arc portion 19 side, and both ends 20a of the cone portion 20 in the tube axis X direction of the glass bulb 3. Of the opening 17 of the cone 20 from the length L1
Since the length L2 of the cone side is increased, the pincushion magnetic field component of the dug portions 23a and 23b of the large-diameter arc portion 21 is reduced, and the opening portion is longer than the length L1 of both end portions 20a of the cone portion 20. Since a new magnetic field 24 as shown in FIG. 7 is generated in the direction of the arrow in the cone area A on the 17th side, misconvergence on the horizontal axis as shown in FIG. 8 can be reduced and higher image quality can be achieved. Can be. Further, it is possible to eliminate the electronic components such as the diode of the convergence correction circuit which is conventionally required.

[0014]

Next, an embodiment of the present invention will be described.

The color picture tube apparatus of the present invention having the structure shown in FIG. 4 (hereinafter referred to as the present invention) uses the convergence means 22 shown in FIGS. 1, 2 and 3. The dimensions L1 and L2 of the small-diameter arc portion 19, the cone portion 20, the large-diameter arc portion 21, and the dug portions 23a and 23b shown in FIGS.
L2 and a to n are such that L1 is 53 mm and L2 is 60 m
m, a is 5 mm, b is 7 mm, c is 20 mm, d is 30
mm, e is 15 mm, f is 33 mm, g is 53 mm, h
Is 55 mm, i is 43 mm, j is 73 mm, k is 88 m
m and m are 5 mm and n is 33 mm. Note that FIG.
Is located at the center of a new magnetic field in the cone area A shown in FIGS. 1 and 2, and the center R of the glass bulb 3 relative to the center horizontal axis Y of the fluorescent screen surface 2. The angle θ between the line segment connecting the vertical deflection coil 16 and the point P is 18 degrees.

For comparison, a diode is provided in the convergence correction circuit, and the digging portions 23a and 23
A conventional color picture tube device (hereinafter referred to as a conventional product) having a vertical deflection coil of the same specification (general saddle type vertical deflection coil without dimensions L2, dimension b, dimension e and dimension j) without b. Made.

[0017] Immediately after the start of the operation of these color picture tube devices, a change in the horizontal axis misconvergence over time (the temperature of the deflecting device rises with time) was examined. The results shown in FIG. 6 were obtained. In FIG. 6, a curve B indicates the product of the present invention, and a curve C indicates the variation amount of misconvergence on the horizontal axis of the conventional product.

As can be seen from FIG. 6, the variation of the misconvergence on the horizontal axis of the color picture tube device is about 0.15 mm in the conventional product, whereas it is about 0.15 mm in the product of the present invention.
It was confirmed that the diameter was 05 mm, which could be reduced to about 1/3.

The reason is that the pincushion magnetic field components of the dug portions 23a and 23b of the large-diameter arc portion 21 are reduced, and a new magnetic field component 24 is formed at the point P of the vertical deflection coil 16 shown in FIG. It is considered that the new magnetic field component 24 strongly acts on the blue, green, and red outer electron beams due to the generation in the direction, and as a result, the horizontal axis misconvergence as shown in FIG. 8 is reduced.

In the product of the present invention, the length of the cone portion 20 is longer by 10 mm at the center portion L2 than at both end portions L1, but the length (L2-L1) is expressed by the horizontal axis as shown in FIG. 5mm-20 depending on misconvergence
mm is preferred. Further, in the product of the present invention, the angle θ shown in FIG. 3 is set to 18 degrees. However, if the angle θ exceeds 23 degrees or the angle θ is smaller than 13 degrees, the abscissa misconvergence change amount increases and the practical angle increases. Not. Therefore,
Is preferably in the range of 13 to 23 degrees.

[0021]

As described above, according to the present invention, the convergence means has digging portions at both ends of the large-diameter arc portion toward the small-diameter arc portion, and the length of the cone portion in the tube axis direction is reduced. By making the central portion length L2 longer than both end lengths L1,
An object of the present invention is to provide a color picture tube device that can reduce misconvergence on the horizontal axis and can eliminate electronic components such as diodes of a convergence correction circuit that have been conventionally required.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing a vertical deflection coil used in a color picture tube device according to an embodiment of the present invention.

FIG. 2 is a plan view of the main part.

FIG. 3 is a sectional front view of a main part of a cone area A of the vertical deflection coil.

FIG. 4 is a side view showing a color picture tube device according to an embodiment of the present invention;

FIG. 5 is a perspective view showing a deflection device used in the color picture tube device.

FIG. 6 is a graph showing the amount of misconvergence change over time immediately after the operation of the color picture tube device according to the embodiment of the present invention and the conventional color picture tube device starts.

FIG. 7 is an operation diagram of misconvergence correction in the color picture tube device according to the embodiment of the present invention;

FIG. 8 is an explanatory diagram of misconvergence on the horizontal axis.

[Explanation of symbols]

 2 Fluorescent screen surface 3 Glass bulb 6 Electron beam 7 In-line electron gun 9 Deflector 16 Vertical deflection coil 17 Cone opening 19 Small diameter arc 20 Cone 21 Large diameter arc 21a, 21b Both ends of large diameter arc 22 Convergence means 23a, 23b Engraved part

Claims (3)

[Claims] 1. A glass bulb having a fluorescent screen surface on an inner surface, an in-line electron gun arranged in the glass bulb for irradiating the fluorescent screen surface with an electron beam, and a horizontal deflection coil disposed outside the glass bulb And a deflection device having a vertical deflection coil, wherein the vertical deflection coil comprises a pair of saddle coils opposed to each other via the glass bulb, and the saddle coil irradiates the electron beam. A small-diameter arc portion, a cone portion having an opening in the center, and a large-diameter arc portion formed sequentially in the direction, and having convergence means at both ends of the large-diameter arc portion for preventing misconvergence. A color picture tube device characterized by the above-mentioned. 2. The convergence means has a dug portion on both ends of the large-diameter arc portion toward the small-diameter arc portion, and the convergence means has a length smaller than the length of both ends of the cone portion in the tube axis direction of the glass bulb. 2. The color picture tube device according to claim 1, wherein the length of the cone portion on the side of the opening is increased. 3. A line connecting the center of the tube axis of the glass bulb to the center horizontal axis of the phosphor screen surface and the center of the magnetic field in the cone area on the opening side, which is longer than both ends of the cone. 3. The color picture tube device according to claim 2, wherein the angle formed by the minute is in the range of 13 to 23 degrees.