JPH01209639A - Magnet composition for convergence correction - Google Patents

Abstract

PURPOSE:To reduce the cost by forming projections or ring-form grooves which are geared to the pushing-out parts of ring-form magnets and maintained rotatable coaxially to the tube axis, at the contact surfaces of a holding member and a spacer to the ring-form magnets. CONSTITUTION:In this convergence correction magnet composition 11, the inner diameter of ring-form magnets 52, 62, and 72 is formed a little larger than the outer diameter of the neck 2 of a cathode-ray tube, and pushing-out parts 52b, 62b, and 72b, which are coaxial to the central axis, are formed. Projections 12d, 13d, and 14d, or ringform grooves 12a, 13a, and 14a, to gear with the pushing-out parts 52b, 62b, and 72b being maintained coaxial, at the surfaces where a holding member 14 arranged at both ends and a spacer 13 arranged at the middle are contacted to the ring-form magnets 52, 62, and 72, are formed. Furthermore, the magnet composition 11 is contacted elastically to tubes 12b, and 14b of the holding member 14 and to the outer wall surface of the neck 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a convergence correction magnet structure used to correct the utility and static φ convergence of a color cathode ray tube having an in-line electron gun.

[Prior Art] FIG. 7 is a partially cutaway side view showing the static convergence correction magnet assembly disclosed in Japanese Patent Publication No. 45936/1983, which is attached to a color cathode ray tube.

In the figure, (1) is the funnel part of the color cathode ray tube;
(2) is a neck portion, (3) is a deflection yoke, (5) is a first variable magnetic field generator composed of a pair of thin ring-shaped magnets (51) and (52), and (8) is a first variable magnetic field generator composed of a pair of thin ring-shaped magnets (51) and (52). The second variable magnetic field generator is composed of ring-shaped magnets (81) and (82), and (7) is also composed of a pair of ring-shaped magnets (
71) and (72), the first variable magnetic field generator (5) generates a bipolar magnetic field for Pury correction, and the second and third variable magnetic field generators Devices (8) and (7) generate 4-pole and 6-pole magnetic fields for static-convergence correction. (0 is a cylindrical support made of a non-magnetic material such as a synthetic resin material that is inserted into the neck part (2), and (8) is a synthetic resin that is fitted and fixed to the cylindrical support (4). There are ring-shaped positioning members (51) and (52) between each positioning member (8).

(61) and (1112), (71) and (7
2) are held in close contact with each other by sandwiching a thin washer (8) for reducing friction, and are rotatably held in the sandwiched state. (10) is a tightening band that tightens and fixes one end of the cylindrical support (4) to the neck (2);
a) is a screw for tightening the convergence correction magnet structure (11) between the cylindrical support (4) and the fastening band (lO).
It consists of

Fig. 8 is a sectional view taken along the line ■-■ in Fig. 7, and (72a) is a protruding tab for adjusting the rotational position formed on the ring-shaped magnet (72), which is also provided on the other ring-shaped magnets. In the figure, R, G, and B are three electron beams emitted from an in-line electron gun (not shown), and the center electron beam G is configured to pass through the tube axis Z.

The convergence correction magnet structure configured in this way (
11), when the color cathode ray tube is operated, the purity correction and static convergence correction can be performed by adjusting the rotational position of each of the ring-shaped magnets (51) to (72).

[Problems to be Solved by the Invention] The conventional convergence correction magnet structure (11) has a large number of component parts, and the ring magnets (51) to (72) are fitted into the cylindrical support (4). Since the inner diameter of the ring-shaped magnet increases by the thickness of the cylindrical support (4), the magnetic field that acts on the electron beam becomes weaker by that much, so the ring magnet that generates a strong magnetic field becomes necessary, and the cost is high.

It is an object of the present invention to provide a low-cost correction magnet assembly that has a small number of component parts and that requires only a ring-shaped magnet that generates a weak magnetic field.

[Means for Solving the Problems] In the convergence correction magnet structure according to the present invention, the inner diameter of each ring-shaped magnet is formed to be slightly larger than the outer diameter of the neck portion, and the inner diameter of each ring-shaped magnet is formed to be slightly larger than the outer diameter of the neck portion, and the structure is arranged so that the inner diameter of each ring-shaped magnet is slightly larger than the outer diameter of the neck portion. The annular extruded portions are formed and overlapped, and the contact surfaces of a spacer and a support member that position and hold each pair of overlapping ring-shaped magnets are respectively engaged with the annular extruded portions. It is characterized in that it is provided with an annular protrusion and a groove that are held together with respect to the tube axis.

[Function] Since the inner diameter of the ring-shaped magnet is formed to be slightly larger than the outer diameter of the neck portion, the ring-shaped magnet can be brought close to the electron beam, and therefore a weak magnet can be used as the ring-shaped magnet.

Further, since the cylindrical support and the tightening band in the conventional device are not required, the number of component parts is reduced.

[Embodiments of the invention] FIG. 1 is a partially cutaway side view of an embodiment of the present invention.

In the figure, (12) and (14) are ring-shaped support members disposed at both ends of the convergence correction magnet structure (1), the inner diameter of which is slightly larger than the outer diameter of the neck (2). The tips of the cylindrical portions (12b) and (tab) provided with the cylindrical portions (12a) and (14a) are formed to have a slightly small diameter and abut against the outer wall of the neck portion (2) with elastic force.

ff It is configured to maintain the arranged position by frictional force, and the inner surface of the flange part has a protrusion (12d) and an annular groove (12d), as shown in FIGS. 2 and 5, respectively.
14d) is formed coaxially with the central axis O. As shown in FIG. 3, the ring-shaped magnets (51), (81), and (71) have arc-shaped extruded portions (51b) and (81), respectively.
b), (71b) are formed coaxially with the central axis 0,
The opening angle θ is 90' in this example. Further, as shown in FIG. 4, the ring-shaped magnets (52), (62), and (72) have annular extruded portions (52b), (
82b).

(72b) is formed coaxially with the central axis 0. The ring-shaped spacer (13) has an annular groove (
13a), and there is also a protrusion (13b) on the contact surface on the opposite side.
is formed, a supporting member (12), a ring-shaped magnet (
51), washer (9), ring-shaped magnet (52).

Spacer (13), ring-shaped magnet (61),...
The support members (14) are stacked in the order shown, and the protrusions (1
2d), (13d) and the arc-shaped extrusion part (51b), (
Ellb), (72b) are engaged, and the arcuate extrusion parts (51b), (81b), (71b) are engaged with the annular extrusion parts (52b), (82b), (72b). , and further an arcuate extrusion part (52b), ([1
2b), (72b) and the annular groove (13a), (
14d) are engaged with each other so that each component is held coaxially with the tube axis Z while being inserted into the neck portion (2) while being held from both ends by the supporting members (12) and (14). , the cylindrical portion (12b) of the support members (12), (14)
, (14b) are formed in the recesses (12c), (1
4c) is fixed to the neck part (2) with adhesive (15), and each ring-shaped magnet (51), (52), (81
), (62), (71), and (72) are configured so that their rotational positions can be freely adjusted within the range of angle θ without coming into contact with the neck portion (2).

FIG. 6 is a partially cutaway side view of another embodiment of the present invention, in which the inner diameter portions of each ring-shaped magnet are pushed out in the same direction with conical extrusion parts (51c), (52c), (etc),
(E12c), (71c), (72c), supporting members (12), (14) and spacer (1
3) are each formed with a conical surface that engages with this extruded portion, and similarly to the embodiment shown in FIG. 1, ring-shaped magnets (51), (52), (81), (82), (71
), (72) can be rotatably held and attached to the neck (2).

In addition, when installing the correction magnet structure (11) according to the present invention, each component is sequentially inserted into the neck part (2), and the elastic force of the cylindrical parts (12b) and (14b) is used to unite them. After assembly and positioning, it is fixed with adhesive (15), but in order to improve workability, a fastening member (16) made of non-magnetic material is attached to the support member (12) as shown by the dashed line in Fig. 1. , (14) A plurality of water hooks may be passed between them, assembled into one body, and then inserted into the neck portion (2).

The configuration for rotatably engaging the support member, spacer, and ring-shaped magnet coaxially with the tube axis Z can be modified in various ways in addition to the above embodiment. , (13a) are respectively formed into annular projections, and arcuate extrusion parts (51b), (Blb), (7
1b) may each be formed into an annular extruded portion, and with this configuration, the ring-shaped magnets can have the same shape.

Further, the supporting members (12) and (14) at both ends are of the same shape, and the direction of the extruded parts of the ring-shaped magnets (71) and (72) is reversed so that the protruding part (13) of the spacer (13)
By changing b) to an annular groove, only one type of support member with a complicated shape can be used by simply preparing two types of spacers (13) with a simple shape.

[Effects of the Invention] In the convergence correction magnet structure according to the present invention, the inner diameter of the ring-shaped magnet is slightly larger than the outer diameter of the neck portion of the cathode ray tube, and an extruded portion coaxial with the central axis is formed. A protrusion or annular groove that engages with and coaxially holds the extruded portion is formed on the surface of the support member disposed on the support member and the spacer disposed therebetween that abuts the ring-shaped magnet, and the support member Since the cylindrical portion is configured to abut elastically against the outer wall surface of the neck portion, the diameter of the ring-shaped magnet can be reduced, the number of component parts can be reduced, and an inexpensive convergence correction magnet structure can be obtained. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of one embodiment of the present invention, FIG. 2 is a diagram showing one support member of this embodiment, and FIG. 3 is a plan view showing one ring magnet of this embodiment. FIG. 4 is a plan view showing the other ring magnet of this embodiment, FIG. 5 is a plan view showing the other support member of this embodiment, and FIG. 6 is a partially broken view showing another embodiment of the present invention. 7 is a partially cutaway side view showing a conventional correction magnet structure, and FIG. 8 is a cross-sectional view taken along the line ■--■ in FIG. 7. (5), (fl), (?)...Variable magnetic field generator, (
11) ... Convergence correction magnet structure, (12)
, (14)...Supporting member, (12b)...Cylindrical part, (12d), (13a)--Protrusion part. (13)...Spacer, (13b), (tad).
...Annular groove, (51), (52), (θ1), (
lli2) , (71), (72)...Ring magnet, (51b), (Blb), (71b)...Circular extrusion part, (52b), (82b), (72b)
...An annular extrusion part. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An arcuate or annular extruded part is formed with an inner diameter slightly larger than the outer diameter of the neck part of the color cathode ray tube and is coaxial with the central axis, and is rotatably overlapped and inserted into the neck part. at least one pair of ring-shaped magnets that generate a magnetic field for convergence correction, a spacer inserted between one pair of ring-shaped magnets and another pair of ring-shaped magnets, and a spacer disposed at both ends of the neck part. A support member is provided which clamps each pair of ring-shaped magnets and a spacer that are fixedly inserted between each other, and the support member and the spacer have contact surfaces with the ring-shaped magnet that are engaged with the extruded portions of the ring-shaped magnets. 1. A convergence correction magnet structure comprising a protrusion or an annular groove that is rotatably held coaxially with respect to a tube axis.