JP3424428B2 - Color picture tube equipment - Google Patents

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 receiver, a computer monitor or the like.

[0002]

2. Description of the Related Art Conventionally, in a color picture tube used in an in-line type color picture tube device, in order to prevent misconvergence caused by an external magnetic field in the tube axis direction (the traveling direction of the electron beam), the inner surface of the convergence device is prevented. Japanese Unexamined Patent Publication No. 7-21938 discloses a technique of providing a magnetic body so as to sandwich three electron beams from both sides. This technique corrects misconvergence by absorbing an external magnetic field such as geomagnetism that acts on the electron beams on the outer sides of the three electron beams and causes Lorentz force by a magnetic substance near the electron gun. is there.

[0003]

However, in such a conventional color picture tube, although the convergence deviation due to the magnetic field in the tube axial direction can be suppressed well, the two-pole magnet of the convergence device for performing static convergence. The static convergence magnetic field generated from the 6-pole magnet and the 4-pole magnet is shielded by the magnetic material, and the desired 6-pole magnetic field cannot be obtained especially in the 6-pole magnet. As a result, it was difficult to adjust the static convergence by using the 6-pole magnet and the 4-pole magnet, and it took a long time for the adjustment.

The present invention facilitates static convergence adjustment by a 6-pole magnet and a 4-pole magnet in a color picture tube apparatus provided with a magnetic body and a convergence apparatus having at least a 6-pole magnet, and by a magnetic field in the tube axial direction. It is an object of the present invention to provide a high-quality color picture tube device capable of suppressing convergence deviation.

[0005]

A color picture tube according to the present invention includes an in-line type electron gun for generating three electron beams, a valve having a neck tube enclosing the in-line type electron gun, and the neck tube. on the peripheral surface, the opposite to each other through an in-line type electron gun, and a magnetic body having the longitudinal direction of the screen surface of the valve, tubular magnet kicked set on the outer peripheral surface of the neck tube A holder and a convergence device having a ring-shaped 6-pole magnet constituted by a set of two on the outer peripheral surface of the magnet holder, each of the magnetic bodies being orthogonal to the long side direction of the screen surface. Symmetric with respect to the orthogonal plane on the tube axis of the neck tube,
The width of the overlapping portion overlapping with the 6-pole magnet in the outer peripheral direction of the neck tube is made narrower than the width of the non-overlapping portion not overlapping with the 6-pole magnet.

According to the present invention, with the above-described structure, a desired 6-pole magnetic field can be obtained in the 6-pole magnet, static convergence adjustment by the 6-pole magnet and the 4-pole magnet can be easily adjusted, and the tube axial direction can be adjusted. Convergence shift due to a magnetic field can be suppressed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 of the present invention will be described below with reference to the drawings.

The color picture tube apparatus according to the first embodiment of the present invention is, as shown in FIG. 3, an in-line type color picture tube 1
A deflection yoke 2 and a convergence device 3.

The color picture tube 1 includes a bulb 6 having a phosphor screen surface 5 of a plurality of colors on an inner surface of a face panel 4.
A shadow mask 7 having a plurality of electron beam light-transmitting holes provided in a position close to the screen surface 5, and an in-line type electron gun 9 enclosed in a neck tube 8 of a bulb 6 and generating three electron beams. Consists of.

A deflection yoke 2 for deflecting the electron beam in the horizontal and vertical directions is provided around the portion where the bulb 6 and the neck tube 8 are welded, and the neck tube 8 around the electron gun 9 is provided.
The static convergence devices 3 are fixed to the peripheral surfaces of the respective.

Further, as shown in FIGS. 1 and 2, the convergence device 3 is provided on the peripheral surface of the cylindrical resin magnet holder 11 in the traveling direction of the electron beam emitted from the electron gun 9. A tightening band 12 made of a non-magnetic metal, which is held and fixed on 8, and a resin lock ring 13 for tightening a magnet.
A pole magnet 14, a 6-pole magnet 15 and a 4-pole magnet 16 are sequentially arranged. The inner surface of the magnet holder 11 is opposed to the inner surface of the magnet holder 11 via the electron gun 9 including three electron beams arranged in-line, and in the long side direction Z of the screen surface 5 including the long side and the short side of the bulb 6. The magnetic bodies 10a and 10b made of iron-nickel magnetic alloy are fixed. Then, the purity correction is performed by the 2-pole magnet 14 and the 6-pole magnet 1 is performed.
Static convergence adjustment is performed by both the 5- and 4-pole magnets 16.

Further, the magnet holder 11 has a cylindrical portion rotatable relative to the neck tube 8 on the screen surface 5 side of the lock ring 13 mounting position, behind the lock ring 13 mounting position, that is, on the screen surface. On the side opposite to 5, the tongue portions 11b having elasticity are provided. Then, the tongue portion 11b is tightened by the tightening band 12 and fixed to the neck tube 8.

As shown in FIG. 4, in the 2-pole magnet 14, the N pole and the S pole are alternately separated by 180 degrees, and in the 6-pole magnet 15, the N pole and the S pole are alternately 60. The quadrupole magnet 16 is magnetized with predetermined magnetic strength at positions 90 degrees apart from each other, with the N poles and S poles being alternately spaced apart. Also, a two-pole magnet 14 and a six-pole magnet 1
The 5- and 4-pole magnets 16 are provided with rotary knob portions 14a, 15a, 16a for facilitating convergence adjustment.

As shown in FIGS. 1 and 2, the magnetic body 10
Reference characters a and 10b each have a substantially rectangular shape having a long side in the tube axis X direction of the neck tube 8, and a long side direction Z of the screen surface 5.
The width L ₁ in the neck tube outer peripheral direction of the overlapping portion that is arranged symmetrically with respect to the orthogonal Y plane on the tube axis X that is orthogonal to the 6-pole magnet 15 does not overlap with the 6-pole magnet 15. It is narrower than the width L _{2 of the} overlapping portion.

More specifically, the magnetic bodies 10a and 10b will be described.
The relationship between the overlapping portion of the 6-pole magnet 15 and the magnetic pole of the 6-pole magnet 15 is as follows.
The opening angle β with respect to the tube axis X between the 7 and the S pole 18 is usually 60 degrees, while the magnetic materials 10a, 10b
In the non-overlapping portion, the opening angle of the line segment connecting the ends 17 and 18 of the width L _{2 in} the outer circumferential direction of the neck tube and the tube axis X is made substantially the same as the opening angle β, and the magnetic bodies 10a and 10b are At the overlapping portion, both ends 1 of the width L _{1 in} the outer peripheral direction of the neck tube
The opening angle α of the line segment connecting the tube axes 9 and 20 is set to ½ or less of the opening angle β, that is, 30 degrees or less, and the width B of the magnetic bodies 10a and 10b in the tube axis X direction is set to 2 The thickness C is set to be larger than the thickness C of the 6-pole magnet 15 configured as a set.

Further, the magnetic bodies 10a and 10b are narrowed at the tongue portion 11b rearward of the mounting position of the lock ring 13 of the magnet holder 11 so as not to stick out from the outer shape of the magnet holder, and the length thereof. The length of the side is substantially the same as the length of the magnet holder 11 in the tube axis direction X.

Next, the operation of the color picture tube device will be described. In the color picture tube device according to the first embodiment of the present invention, both ends 1 of the magnetic body 10 a at the position of the sextupole magnet 15 are arranged.
Since the opening angle α of 7 and 18 (both ends 17 and 18 of the magnetic body 10b) with respect to the tube axis X is 30 degrees or less, it is possible to minimize the shielding of the convergence adjusting magnetic field generated from the 6-pole magnet 15. Since a 6-pole magnetic field having no practical problem can be obtained, the static convergence adjustment by the 6-pole magnet 15 and the 4-pole magnet 16 can be easily performed.

Further, in the color picture tube device according to the first embodiment of the present invention, the width of the non-overlapping portion in the outer peripheral direction of the neck tube 8 in the magnetic bodies 10a and 10b for suppressing the convergence deviation due to the external magnetic field in the tube axis direction is set. Since it can be made as large as the conventional one, a sufficient shield effect of the external magnetic field can be obtained.

[0019]

EXAMPLES Next, examples for confirming the effects of the present invention will be described.

The color picture tube device of the embodiment of the present invention has the structure shown in FIGS. 1 to 4, uses a color picture tube having a neck tube 8 having an outer diameter of about 29 mm, and uses the width of the 6-pole magnet 15 C
Is about 2 mm, the width B of the magnetic bodies 10a and 10b is about 4 mm, and the width L ₁ of the magnetic bodies 10a and 10b, that is, the opening angle α is changed from 0 degrees to 60 degrees.

Then, the spot movement amount of the electron beam on the screen surface 5 when the sextupole magnet 15 is adjusted (hereinafter,
The 6-pole magnetic field correction amount) and the spot movement amount of the electron beam on the screen surface 5 when the 4-pole magnet 16 is adjusted to correct the color shift of the 4-pole magnetic field due to the spot movement amount (hereinafter, referred to as 4 The result as shown in FIG. 5 was obtained, and the magnetic substance 1
When the opening angle α of 0a (10b) is 30 degrees, for example, 6
Even if the polar magnetic field correction amount is changed to 0.5 mm, the quadrupole magnetic field correction amount can be reduced to 0.05 mm or less, and the magnetic substance 10a (1
It has been found that the adjustment of the quadrupole magnet 16 can be practically unnecessary by providing 0b).

The reason for this will be described with reference to FIGS. 6 and 7. In FIG. 6, the opening angle α of the magnetic body 10a (10b) is 45.
The shape of the correction magnetic field of the 6-pole magnet 15 is shown for the case of 60 degrees and 60 degrees. As shown in FIG. 6, the magnetic field of the sextupole magnet 15 is absorbed by the magnetic body 10a (10b),
The 4-pole magnetic field component is strongly generated in the 6-pole magnetic field, the 6-pole magnetic field is distorted, and the desired 6-pole magnetic field cannot be obtained.
In addition to adjusting the 6-pole magnet 15, it is necessary to newly adjust the 4-pole magnet 16. However, when the opening angle α of the magnetic body 10a (10b) is 30 degrees, as shown in FIG. 7, the quadrupole magnetic field component of the sextupole magnet 15 is substantially free of the quadrupole magnetic field component. It is considered that a polar magnetic field was obtained, and static convergence was achieved by adjusting only the sextupole magnet 15. 6 and 7, the magnetic body 10a (10
It shows a case where two of the six poles are on the vertical axis, where the shielding effect of the six-pole magnetic field due to b) appears most significantly.

Next, when the opening angle α was 30 degrees or less, the convergence deviation due to the magnetic field in the tube axis direction was examined.
The opening angle α is 30 degrees or less, that is, the magnetic bodies 10a, 10
It was found that even if the overlapping portion of b with the 6-pole magnet 15 was completely removed, the convergence deviation due to the magnetic field in the tube axis direction of the neck tube 8 could be suppressed. Further, at this time, it was also found that the adjustment of the quadrupole magnet 16 can be practically unnecessary as in the case where the opening angle α of the magnetic body 10a (10b) is 30 degrees.

In the first embodiment, the magnetic body 10
Although a and 10b are described as being attached to the inner surface of the magnet holder 11, they may be fixed to the outer peripheral surface or the inner peripheral surface of the neck tube 8.

Although the magnetic bodies 10a and 10b have been described as being of a substantially rectangular shape having long sides in the tube axis direction of the neck tube 8, they are not necessarily limited to this, and a magnetic field component in the tube axis direction such as a wedge shape or a rhombus shape is not necessarily limited thereto. It is not limited to this as long as it can be sufficiently absorbed.

As the respective magnets of the convergence device 3, the two-pole magnet 14, the six-pole magnet 15 and the four-pole magnet 16 are sequentially arranged in the traveling direction of the electron beam, but the present invention is not limited to this. . However, in the magnetic bodies 10a and 10b, the width L ₁ of the overlapping portion overlapping the 6-pole magnet 15 in the outer peripheral direction of the neck tube 8 must be narrower than the width L _{2 of the} non-overlapping portion not overlapping the 6-pole magnet 15. I won't.

Further, the width B of the magnetic bodies 10a and 10b in the direction of the tube axis X of the neck tube 8 is made larger than the thickness C of the 6-pole magnet 15 constituted by a set of two magnetic bodies. 1
The width B of 0a and 10b is not limited to this condition as long as the width B sufficiently absorbs the magnetic field component in the tube axis direction.

[0028]

As described above, the present invention provides a high-quality color picture tube device which facilitates static convergence adjustment by a 6-pole magnet and a 4-pole magnet and can suppress convergence deviation due to a magnetic field in the tube axis direction. What can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part of a convergence device according to a first embodiment of a color picture tube device of the present invention.

FIG. 2 is a sectional view taken along line AA of the convergence device.

FIG. 3 is a side sectional view of the first embodiment of the color picture tube device of the present invention.

FIG. 4 is a view of the second embodiment of the same color picture tube device.
The figure which shows the magnetic pole position of a pole magnet, a 6 pole magnet, and a 4 pole magnet.

FIG. 5 is a diagram showing a relationship between a 6-pole magnetic field correction amount and a 4-pole magnetic field correction amount when the opening angle α is changed from 0 degree to 60 degrees in the first embodiment of the color picture tube device.

FIG. 6 is a diagram showing a state of a correction magnetic field of a 6-pole correction magnet when the opening angle α is set to 60 degrees.

FIG. 7 is a diagram showing a state of a correction magnetic field of a 6-pole correction magnet when the opening angle α is set to 30 degrees.

[Explanation of symbols]

3 Convergence device 6 valves 8 neck tubes 9 In-line type electron gun 10a, 10b Magnetic substance 11 Magnet holder 15 6 pole magnet

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 29/54

Claims (5)

(57) [Claims] 1. An in-line type electron gun for generating three electron beams, a valve having a neck tube enclosing the in-line type electron gun, and the in-line type electron gun on the peripheral surface of the neck tube. two through to face, and the magnetic body having the longitudinal direction of the screen surface of the valve, on the outer peripheral surface of the cylindrical magnet holder and the magnet holder kicked set on the outer peripheral surface of the neck tube And a convergence device having a ring-shaped six-pole magnet configured as a set, wherein each of the magnetic members is perpendicular to a plane perpendicular to the long side direction of the screen surface on the tube axis of the neck tube. A color picture tube device, which is symmetrical and has a width in an outer peripheral direction of the neck tube of an overlapping portion overlapping with the 6-pole magnet smaller than a width of a non-overlapping portion not overlapping with the 6-pole magnet. Wherein the opening angle of a line connecting the width across the tube axis of the overlapping portions of the magnetic body and alpha (degrees), opening angle of a line connecting the magnetic pole and the tube axis adjacent hexapole magnet 2. The color picture tube device according to claim 1, wherein there is a relationship of α ≦ β / 2, where β is a degree. 3. A color picture tube apparatus according to claim 1 or 2, wherein said magnetic member is mounted on an inner surface of the magnet holder. 4. A color picture tube apparatus according to claim 1 or 2, wherein said magnetic member is fixed to an outer surface of the neck tube. 5. A color picture tube apparatus according to claim 1 or 2, wherein said magnetic material is fixed to the inner peripheral surface of the neck tube