JPH0260031A - Magnet device for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To position a plurality of magnetic pole pieces near a neck part tube wall by coupling the portion of a magnetic pole holder between magnetic pole pieces to a neck part mounting body and so forming the part of the neck mounting body corresponding to the magnetic pole pieces as to have a diameter smaller than a part to be coupled to the holder. CONSTITUTION:When a magnetic pole holder 9 is pushed from the edge of a neck part mounting body 4, a claw part 4b is defected inward due to the coupling part 9b of the holder 9. Also when this coupling part 9b strides over the claw part 4b and the claw part 4b comes to be located at a groove part 9a, the claw part 4b is reset due to the elasticity thereof and the magnetic pole holder 9 is thereby mounted to the neck part mounting body 4. As aforementioned, a portion between the magnetic pole pieces 8A to 8H of the holder 9 is coupled to the neck mounting body 4 and, therefore, an insulation part 4c corresponding to he magnetic pole pieces 8A to 8H of the neck mounting body 4 has no mounting function. It follows, therefore, that the outer diameter dphi of the insulation part 4 can be so formed as to be smaller than the coupling outer diameter Dphi of the neck mounting body 4, or the insulation part 4c can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an external magnet type magnet device for adjusting magnetization for adjusting the static convergence and purity of a color cathode ray tube by external magnetization.

[Conventional technology]

In color cathode ray tubes (well, to absorb component errors and manufacturing variations, a magnetic device is installed to adjust static convergence and purity at the center of the screen.

Conventional magnet devices are disclosed, for example, in U.S. Pat. No. 3,725.
As shown in 831, a plurality of pre-magnetized magnet rings with 2.4.6 poles are connected to a color bra 1, title of invention: color cathode ray tube magnet device 2, claim 1, static convergence of color cathode ray tube. a 3° magnetic pole holder in which a plurality of magnetized magnetic pole pieces are attached circumferentially in order to adjust the polarity; and a neck fixed to the neck of a color cathode ray tube, into which the magnetic pole holder is fitted and secured. a part attachment body, the part between the magnetic pole pieces of the magnetic pole holder is fitted into the neck part attachment body, and the part of the neck part attachment body corresponding to one of the magnetic pole pieces is inserted from the fitting part of the magnetic pole holder. A color cathode ray tube magnet device characterized by a small diameter (formed or removed).

2. The color cathode ray tube magnet device according to claim 1, wherein the magnetic pole holder is detachably attached to the neck attachment body.

3. The magnetic pole holder is rotatably attached to the neck of the groove run tube between the magnetic pole pieces, and is adjusted by rotating these magnetic rings.

However, this structure requires a large number of parts (there are many parts, and each magnet is not included), and it is necessary to magnetize the II ring to a high degree of fragility, resulting in high costs. Further, adjustment requires highly skilled workers, and it is extremely difficult to make adjustments in a short period of time.

Therefore, as a solution to this problem, for example, U
, S, P4.138.628.4, 159°456.4
, 162, 470, etc. As shown, the barium ferrite sheet is wrapped directly around the neck tube, and this is fixed using a tie bar or the like. It has been proposed that the pot is magnetized with multiple poles to generate a magnetic field that achieves the desired correction by applying strong magnetization.

[Invention or problem to be solved]

The above conventional technology uses a barium ferrite sheet as a magnet member for magnetization, so the temperature characteristics of its magnetization are approximately -0.2%/'C, which is affected by the temperature rise of the dog pole, neck, and cabinet. However, there were problems in that the static convergence drift was large and it was difficult to maintain the high degree of consistency required for display applications.

In order to solve this problem, the applicant placed a plurality of magnetized magnetic pole pieces made of a metal alloy around the neck tube, and created a magnetic field by magnetizing the plurality of magnetic pole pieces. A magnetic device for adjusting static convergence and utility is pending, which will be described in further detail.

Conventionally used barium ferrite has a small temperature drift, so rare earth cobalt or Fe-Cr-C, which has excellent temperature characteristics, is used for display V.

It is necessary to use a magnetic material such as a magnet type. However, unlike conventional magnet materials, it is difficult to obtain a flexible sheet-like material for this type of magnet material, and it is difficult to form an integrated structure. Furthermore, even when magnetized, it is difficult to obtain a magnetic field distribution that requires one adjustment because the magnetic permeability of the material is high. For these reasons, it is necessary to arrange a plurality of independent magnetic pole pieces around the neck portion and adjust the amount of magnetization to adjust the static convergence and utility characteristics.

In order to arrange multiple independent magnetic pole pieces on the outside of the neck, a ring-shaped magnetic pole holder is fixed to the outer diameter of the neck in the same way as other fine adjustment magnet rings. This means that the neck attachment body, such as the holder or deflection yoke screw fixing part, is fixed. However, when a magnetic pole holder is inserted and fixed on the outer diameter of the neck mounting body, the magnetic pole piece is often placed in a direction away from the center of the neck, and the size of the magnetic pole piece required for the same beam position adjustment is difficult. The problem arises that the ripples become larger.

It is also conceivable to mold multiple magnetic pole pieces directly into the neck mounting body (as described above), but this is disadvantageous in terms of manufacturing cost, and requires a lot of time and effort, especially since it requires no change in magnetic pole characteristics and a mold change. It is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet device for a color cathode ray tube in which a plurality of magnetic pole pieces are brought close to the neck tube wall.

[Means to solve the problem]

The above purpose (well, it has a magnetic pole holder in which a plurality of magnetic pole pieces to be magnetized are attached in a circumferential manner, and a neck mounting body to which the magnetic pole piece is fixed on the shaft and the magnetic pole holder is fitted and fixed). Then, the part between the magnetic pole pieces of the magnetic pole holder is fitted into the neck part fitting body, and the part of the neck part fitting body corresponding to the magnetic pole piece is fitted into a hole with a smaller diameter than the fitting part to the magnetic pole holder. This can be achieved by forming or removing.

[Effect]

Since the part between the magnetic pole pieces of the magnetic pole holder is used as the fitting part for the neck part attachment body, the part of the neck part attachment body corresponding to the magnetic pole piece has a smaller diameter than the part to which the magnetic pole holder is attached. This can be done by bringing the magnetic pole piece closer to the neck tube wall by the amount by which the diameter is reduced or removed.

Furthermore, by detachably attaching the magnetic pole holder to the neck attachment body, it is easy to deal with changes in pipe type or design. Add another fine adjustment to the neck attachment body (for re-adjustment)
When installing the magnet ring, etc., it is easy to insert it.

In addition, by fitting the magnetic pole holder and the neck mounting body using the grooves provided on the magnetic pole holder and the claws provided on the neck mounting body, it is easy to maintain the position of the magnetic pole holder relative to the neck mounting body. It depends on whether it is installed on the machine or not.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 91. As shown in Figure 9, color cathode ray tube 1 (
This is equipped with a deflection yoke 2 and a magnet device 3 for static convergence and purity adjustment. Here, since the deflection yoke 2 is not directly related to the gist of the invention, detailed explanation thereof will be omitted.

The magnet device 3 has a structure as shown in FIGS. 1 to 3. That is, a cylindrical neck attachment body 4 made of an electrically insulating material such as plastic, which is attached to the neck portion 1a of a color cathode ray tube 1, has a collar m4a, and a fixing lock is provided on the deflection yoke 2 side of the collar m4a. Ring 5, spacer 6A1 fine adjustment magnet ring 7
and a spacer 6B are attached. Here, the lock ring 5 and the magnetic lock ring are rotatable. However, the spacers 6A and 6B are used to prevent the I+ ring 7 from rotating together.
The spacers 6A and 6B have a convex shape and the neck attachment body 41 has a concave shape, and although they are movable in the tube axis direction, they cannot rotate. Also, on the outer periphery of the tip of the neck attachment body 4, there are a plurality of magnetic pole pieces 8A to 8A which are magnetized to adjust static convergence and purity.
A magnetic pole holder 9 made of an electrically insulating material such as plastic and having 8H embedded therein in a circumferential manner is detachably attached. The magnetic pole pieces 8A to 8H are made of rare earth cobalt or re-
It is made of a Cr--Co alloy, etc., and the temperature change in magnetic flux density after magnetization is -0.03 cm/°C, which is about % smaller than that of conventionally used magnets. Therefore, even if the temperature of the neck portion 1a rises during operation, the temperature change in the magnetic flux density is small, and the changes in the static convergence and purity adjustment amounts can be practically ignored.

The structure of attaching the magnetic pole holder 9 to the neck attachment body 4 is as follows. Magnetic pole holder 9I
Figures 2, 3 and 7 number 1 as shown, pole piece 8
A groove portion 9a is formed in a portion between 8H and 8H. As shown in FIGS. 2 to 6, the neck mounting body 4 is formed with a claw portion 4b that engages the side wall f of the groove portion 9a, and between the claw portion and ib, that is, the magnetic pole piece. Insulating portions 4C are formed in the partial holes corresponding to 8A to 8Hf. Further, an axially extending slit 4d is provided between the claw portion 4b and the insulating portion 40 so that the claw portion 4b has elasticity.

Therefore, when the magnetic pole holder 9 is pushed in from the end face of the neck mounting body 4, the claw portion 4b bends inward due to the fitting ff1s9bφ of the magnetic pole holder 9, the fitting portion 9b climbs over the claw portion 4b, and the claw B4b enters the groove portion 9a. Once positioned, the claw portion 4b returns to its elastic position, and the magnetic pole holder 9 is attached to the neck attachment body 4.

In this way, since the portion between the magnetic pole pieces 88 to 8H of the magnetic pole holder 9 is fitted with the neck attachment body 4I,
Insulating section 4C corresponding to magnetic poles 8A to 8H of neck mount 4
The installation has a function. Therefore, the outer diameter dφ of the insulating portion 4C can be made smaller than the fitting outer diameter Dφ of the neck attachment body 4, or the insulating portion 4C can be removed. The magnetic poles 88 to 8H can be brought closer to the tube wall of the neck portion 1a by reducing or removing the diameter of the insulating portion 4C.

As shown in FIG. 1, a tightening tongue portion 4e is provided on the collar portion 4a of the neck attachment body 4 on the side opposite to the magnetic pole holder 9. The tightening tongue portion 4e is provided with a sling 4f and has elasticity in order to secure the entire neck portion attachment body 4 to the neck portion 1afC by means of the tightening band 10 and the tightening bolt llG.

By the way, in order to integrally mold the neck part attachment body 4 having such a shape (in this case, it is necessary to insert a molded pin for forming the claw part 4b from the side of the tightening tongue H4e), the collar part 43G is provided with a molded pin insertion hole 4g (see Fig. 4) in the axial portion corresponding to the claw portion 4b, and an axially extending portion of the claw portion 4b (the tightening tongue portion 4e). By providing the tightening tongue portion 4e on the extension portion of the claw portion 4b in this manner, the neck portion attachment body 4 is firmly fixed to the neck portion 1aG.

On the other hand, in order to securely fix the magnetic pole holder 9 to the neck attachment body/NC (in this case, it is preferable to provide the fitting part 9b evenly around the circumference of the magnetic pole holder 9, and in this embodiment, 8 magnetic poles Pieces 88 to 8H are arranged evenly around the circumference, and this magnetic pole piece 8
One fitting part 9b is provided between 8H and 8H.

Next, the magnetization of the magnetic pole pieces 8A to 8H will be explained.

FIG. 9 (After attaching the deflection yoke 2 and magnet device e3 to the cathode ray tube 1t as shown in this figure, the magnetic pole pieces 8A to B
Fi, the required ff correction amount (how to perform the corresponding magnetization)
From this, static convergence and purity are adjusted. The magnetized state of these magnetic pole pieces 8A to 8H is
This will be explained using figures. 131 in the same figure shows the case where both side beams are adjusted in opposite directions in the vertical direction, and this adjustment is performed by the magnetic pole piece 8A.
, 8C, 8E, and 8Gi. Figure 1) shows a case where the side beam is adjusted in opposite directions in the left and right directions, and this adjustment is performed by the magnetic pole pieces 8B, 18D, 8F, and 8Hi. In the same figure (cl is when adjusting by moving the side beams in the same direction in the left and right directions. This adjustment is performed by moving the magnetic pole pieces 8A, 8B, 8D,
This is done using 8E18F18Hi. In an actual color cathode ray tube, the required amount of correction is a combination of these, and the magnetization accordingly becomes a magnetized state in which these are superimposed.

In addition, in the above embodiment, eight magnetic pole pieces 8A to 8H
Although the description has been made for the case where 6 or more are used, adjustment is possible if there are 6 or more.

Magnetic pole pieces 88 to 8H with little temperature change in magnetic flux density
1j Since rare metals are used, the magnetic pole pieces 8A to 8H are expensive, but each of the magnetic pole pieces 8A to 8H requires a small volume and requires a small amount of use, so it can be realized at low cost. In non-example, magnetic pole piece 8A~
8H is 3.5 mφ x 711! It is s+. Further, these magnetic pole pieces 88 to 8H can be easily manufactured by cutting wire rods, and there is no problem in manufacturing them when they are made into an annular shape or a sheet shape.

As is clear from the above explanation, only the portion between the magnetic pole pieces 88 to 8H of the magnetic pole holder 9 is formed as the fitting portion 9b, so the outer diameter dφ of the insulating portion 4C is The magnetic pole pieces 88 to 8H are attached to the neck portion 1aO by a diameter smaller than the fitting outer diameter Dφ or by removing the insulating portion 4C.
) QQ placed very close to the wall. Since the magnetic pole pieces 8A to 8H can be arranged close to the neck part 1af as shown in C, the same magnetic pole pieces 8A to 8H have a large value of about 30%v, so the temperature coefficient is small. magnetic pole piece 8
The size can be reduced to 8 to 8H, and magnetization is also facilitated.

In addition, since the magnetic holder 9 is attached to the removable pot on the unshaped part attachment body 4, it is easy to respond to changes in the pipe AI1 or design changes. Furthermore, when attaching the fine adjustment magnet ring 6 etc. to the neck mounting body 1, use this magnet ring 6.
You can easily insert it.

Also, the magnetic pole holder 9 is provided with a fitting between the magnetic pole holder 9 and the neck attachment body 4? (゛q capital 9a and neck mounting body 4
Since the magnetic pole holder 9 can be easily attached to the neck mounting body 4f while maintaining their mutual positions, the magnetic pole holder 9 can be easily attached to the neck mounting body 4f.

〔Effect of the invention〕

As claimed in claim 1, by bringing the magnetic pole piece close to the neck tube wall, the magnetic pole piece can be made smaller and magnetization is also facilitated.

By constructing the scope of claim 2,
Changes depending on the pipe type, etc.
(Mags for fine adjustment) II rings, etc. can be easily installed.

By configuring the magnetic pole holder as described in claim 3, the magnetic pole holder can be easily attached to the neck mounting body while maintaining the mutual position.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view of a magnet device according to an embodiment of the invention, Fig. 2 is a left side view of Fig. 1, and Fig. 3 is A of Fig. 2.
- A sectional view, Figure 4 is a front view of the neck attachment body, Figure 5
The figure is a side view of Fig. 4, Fig. 6 is a partial view of section B in Fig. 4, Fig. 7 is a front view of the magnetic pole holder, Fig. 8 1a) lb
lfcl is an explanatory diagram showing the relationship between the magnetized state of the magnetic pole piece and the movement of the electron beam, and FIG. 9 is a side view of the magnet device shown in FIG. Lla--Fugu net device, 4-Full-shaped part mounting body, 4b...Claw HIS, 4d--Slit,
;3A~81-■...Magnetic pole piece, 9...Magnetic pole holder 9a...Groove, 9))...
Fitting portion. Agent Patent Attorney Katsutoshi Ogawa Figure 4 Figure 6 Figure 4b: Substitute section 4d's 1, 8A-8H: Flattened piece 9° Stone n Tahor 7...- 90: Groove section 9b : Mushiai HB 4: Nee 77 people p ears R44 Imine (b)

Claims (1)

[Claims] 1. A plurality of magnetic pole pieces that are magnetized to adjust the static convergence and polarity of a color cathode ray tube are attached to a magnetic pole holder circumferentially, and are fixed to the neck of the color cathode ray tube. and a neck attachment body into which the magnetic pole holder is fitted and fixed, a portion between the magnetic pole pieces of the magnetic pole holder is fitted into the neck attachment body, and a portion corresponding to the magnetic pole piece of the neck attachment body is fitted. A magnet device for a color cathode ray tube, characterized in that a portion is formed to have a smaller diameter than a fitting portion of the magnetic pole holder or is removed. 2. The color cathode ray tube magnet device according to claim 1, wherein the magnetic pole holder is detachably fitted to the neck attachment body. 3. The magnetic pole holder has a groove between the magnetic pole pieces, and the neck attachment body has a claw that engages with the groove of the magnetic pole holder, and the claw has elasticity. 2. The color cathode ray tube magnet device according to claim 1, wherein axial slits are formed on both sides of the magnet.