JPH10247462A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke capable of reducing an eddy current generated in an E-type magnetic core, and capable of smoothly correcting misconvergence. SOLUTION: On the back face 1RP of a backward cylindrical enlarged diameter section 1R of a separator 1, VCR correction coils 26 and 26' having an E-type magnetic core 20 are provided on the both sides of the X axis in such a manner as to hold a neck tube 8N. A magnetic powder undergoes surface treatment by using a surface treatment agent containing a compound having an amino quinone group as a constituent element, and is pressed and molded by using a high polymer resin as a binder, and is heated and cured to obtain a magnetic core used as the E-type magnetic core 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a color cathode ray tube, and more particularly to a deflection yoke having an improved magnetic core wound with a coil so that misconvergence can be corrected well.

[0002]

2. Description of the Related Art In a deflection yoke which is mounted on a color cathode ray tube in which a plurality of electron guns are arranged in an inline shape,
At present, misalignment can be theoretically reduced to zero by configuring the horizontal deflection magnetic field distribution by the horizontal deflection coil as a pinch type as a whole and the vertical deflection magnetic field distribution by the vertical deflection coil as a barrel type. The self-convergence method that can be used is mainly used. However, in practice, there are restrictions on the structure of the cathode ray tube, the structure of the deflection yoke, and manufacturing variations, and it is difficult to obtain theoretical characteristics. Therefore, various types of misconvergence actually occur.

In particular, in a saddle type deflection yoke of a self-convergence type using a saddle type deflection coil as a horizontal / vertical deflection coil, since a vertical deflection magnetic field forms a barrel magnetic field, as shown in FIG. G at the top and bottom of the screen
A phenomenon called VCR narrow occurs in which the amount of vertical deflection of the (green) electron beam is smaller than that of the R (red) and B (blue) electron beams. This misconvergence cannot be corrected only by a combination of a cathode ray tube and a deflection coil due to structural restrictions.

Therefore, a pair of multi-pole coils, each of which is provided on each leg of the E-shaped magnetic core, are placed on an insulator at the end face of the deflection yoke on the rear side of the electron gun in a direction perpendicular to the electron gun arrangement (X-axis direction). Are arranged facing each other. The coils provided on each leg are connected in series, and the vertical deflection coil and its multi-pole coil are connected so that a vertical deflection current flows through the multi-pole coil. It is carried out.

Here, the configuration of a conventional deflection yoke will be described in detail with reference to FIGS. FIG. 4 is a partially broken side view showing a state in which a deflection yoke is mounted on a color cathode ray tube (hereinafter, may be abbreviated as CRT).
FIG. 4 is a rear view showing a state in which a deflection yoke is mounted on the CRT. In FIG. 4, a deflection yoke 7 has a pair of saddle-type horizontal deflection coils 2 mounted on the inner surface of a separator 1 made of a plastic material (insulating resin) so as to face each other in the vertical direction (Y-axis direction). It is schematically configured by mounting a pair of saddle-type vertical deflection coils 3 so as to face each other in the horizontal direction (X-axis direction), and mounting a core 4 so as to cover the outsides of the coils 2 and 3.

The separator 1 is expanded from the rear neck tube 8N side of the CRT 8 to the front funnel 8F side, and stores a rear bend-up portion of the horizontal deflection coil 2 formed on the rear neck tube 8N side. The front-end bend-up portion of the horizontal deflection coil 2 formed on the side of the front funnel 8F, and the rear-end tightening portion 1P further extending rearward along the tube surface of the neck tube 8N. It is configured in a tubular shape comprising the front end enlarged portion 1F. The deflection yoke 7 is inserted from the end of the neck tube 8N to a portion between the funnel 8F and the neck tube 8N, is mounted so as to wrap the portion from above, and connects the rear end tightening portion 1P to the CRT 8N.
Is fixed to the CRT 8 by fastening to the neck tube 8N with the fastening band 5. Then, each of the R, G, and B electron beams emitted from the electron gun 9 provided in the neck tube 8N is deflected.

Further, in FIG. 5, a misconvergence VC is provided on the rear surface 1RP of the rear cylindrical enlarged diameter portion 1R of the separator 1 so as to sandwich the neck tube 8N on the left and right on the X axis.
Multi-pole coil to correct R narrow (VCR correction coil)
6, 6 'are attached. Multi-pole coil 6, 6 '
Is composed of an E-shaped magnetic core 11 and coils 12a to 12c and 12d to 12f wound around each leg of the E-shaped magnetic core 11.

FIG. 6 shows a soft magnetic piece 10 obtained by stamping a sheet of silicon steel or permalloy into an E-shape. By laminating a plurality of the soft magnetic pieces 10, an E-shaped magnetic core 11 of the multipole coils 6, 6 'is formed. FIG. 7 shows a multi-pole coil 6 in which coils 12a, 12b, 12c or 12d, 12e, 12f are wound around each leg of an E-shaped magnetic core 11.
6 'is shown.

FIG. 8 shows the multi-pole coils 6, 6 'viewed from the rear side of the deflection yoke 7 when the upper half of the screen is deflected.
3 shows an operation example. When the upper half of the screen is deflected, the magnetic poles of the E-shaped core 11 of the multi-pole coil 6 are S, N, S poles from above, and the magnetic poles of the E-shaped core 11 of the multi-pole coil 6 'are N, S, Each of the coils 12a-1
2f is wired. Each of the R, G, and B electron beams emitted from the electron guns arranged in a horizontal row has multi-pole coils 6, 6 '.
Is located between the central magnetic poles of the E-shaped magnetic cores.

Further, the operation of the multipole coils 6, 6 'will be described. When the upper half of the screen is deflected, a positive series vertical deflection current flows through the vertical deflection coil 3 and the multipole coils 6, 6 '. When the upper half of the screen is deflected by a positive current flowing through the multipole coils 6, 6 ', a magnetic field in the direction of arrow 16 is generated in the multipole coil 6 from the center magnetic pole (N pole) to the magnetic poles (S poles) at both ends. The multipole coil 6 'has magnetic poles (N
), A magnetic field in the direction of arrow 17 is generated from the center magnetic pole (S pole).

The three electron beams operate as follows by the magnetic field generated by the multipole coils 6, 6 '. An R electron beam is located near the central magnetic pole of the multipole coil 6, and a B electron beam is located near the central magnetic pole of the multipole coil 6 '. The magnetic field from the central magnetic pole (coil 12b) of the multipole coil 6 acts on the R electron beam, and the magnetic field from the central magnetic pole (coil 12e) of the multipolar coil 6 'acts on the B electron beam. Works. Therefore, R
The electron beam of B also moves in the direction of arrow 13 directly below, and the electron beam of B also moves in the direction of arrow 14 directly below.

Further, the magnetic poles (N
Pole: Arrow 1 from the coils 12d, 12f) to the magnetic poles (S pole: coils 12a, 12c) at both ends of the multi-pole coil 6.
A magnetic field is generated in directions 8 and 19. The magnetic field from the center pole of the multipole coil 6 to the center pole of the multipole coil 6 'is indicated by an arrow 18,
The magnetic field is canceled by the magnetic field in the 19 direction, and the magnetic field in the directions of arrows 18 and 19 acts on the central electron beam. Therefore, the G electron beam moves in the direction of arrow 15 directly above due to this magnetic field.

Thus, for the three electron beams located between the magnetic poles at both ends of the multipole coils 6, 6 'and the central magnetic pole, the magnetic poles at both ends of the multipolar coils 6, 6' and the central magnetic pole are removed. The magnetic field generated between the multi-pole coils 6 and 6 ′ acts only in the horizontal direction. Therefore, the three electron beams are deflected in the vertical direction, and the above-described misconvergence VCR narrow can be corrected.

Further, with this VCR correction alone, since the electron beam of the G of the central electron gun is located at the center of the magnetic field, the amount of deflection in the deflection magnetic field is small. In some cases, the amount does not match, and misconvergence called green droop, in which the G color line becomes an arc shape with respect to the horizontal R color line and B color line in the vertical direction of the screen, remains. In this case, the green droop misconvergence can be corrected by superimposing the parabolic current of the horizontal deflection cycle modulated by the vertical deflection cycle on the VCR correction current.

[0015]

As described above, the multi-pole coils (VCR correction coils) 6, 6 'are arranged on the X-axis of the rear surface 1RP of the rear cylindrical enlarged portion 1R of the separator 1 of the deflection yoke 7 as described above. Since it is attached to the upper left and right sides so as to sandwich the neck tube 8N, a part of the horizontal deflection magnetic field shunts to the E-shaped core 11, and the shunted magnetic field generates an eddy current in the E-shaped core 11. The horizontal deflection magnetic field is generated by passing a sawtooth wave current as shown in FIG. This horizontal deflection current has a repetition period T of a combination of a scanning period ts for scanning the electron beam from the left end to the right end of the screen and a retrace period tr for returning the electron beam from the right end to the left end of the screen.

The repetition period T is determined by the horizontal deflection frequency, and becomes higher as the color cathode ray tube display device displays a higher definition. The retrace period tr is required to return the electron beam from the right end to the left end of the screen quickly.
期間 period, ie, scanning frequency (horizontal deflection frequency)
, The eddy current generated in the E-shaped magnetic core 11 becomes largest in the portion from the end of the retrace period tr to the beginning of the scanning period ts, and the horizontal deflection current becomes zero. Becomes smaller toward the center of the screen, and becomes zero at the center. Further, the horizontal deflection current gradually increases from the center of the screen toward the right end of the screen, and the eddy current also increases.

Now, considering the case where the electron beam is deflected from the left end of the screen to the center of the screen, an eddy current generated in the E-shaped magnetic core 11 causes a magnetic field φ in a direction as shown in FIG.
E occurs. The magnetic field φE due to the eddy current is superimposed in the same direction as the magnetic field generated by the horizontal deflection coil 2. It has a more pincushion shape than the distribution. In particular, this tendency is stronger at the electron beam scanning start portion (left end portion of the screen) than at other portions.

Therefore, when the displacement (misconvergence X _H ) in the X-axis direction of the R color line and the B color line at both ends on the X-axis of the screen is matched, as shown in FIG.
At both left and right edges of the screen, the G color line is shifted to the right with respect to the R / B color line, and the shift is larger on the left side of the screen than on the right side, and the convergence quality is significantly reduced. A similar phenomenon occurs not only in the E-shaped magnetic core 11 but also in other types of magnetic cores.

The present invention has been made in view of such a problem, and it is possible to reduce an eddy current generated in a magnetic core for correcting misconvergence, and thus to properly correct misconvergence. It is an object of the present invention to provide a deflection yoke that can be used.

[0020]

According to the present invention, there is provided a deflection yoke which is mounted on a color cathode ray tube in which a plurality of electron guns are arranged in an inline manner, in order to solve the above-mentioned problems of the prior art. In a deflection yoke having a magnetic core wound with a coil for correcting misconvergence on a screen of a cathode ray tube, a magnetic powder surface-treated with a surface treating agent containing a compound having an aminoquinone group as a constituent unit as the magnetic core. Another object of the present invention is to provide a deflection yoke using a magnetic core obtained by press-molding a polymer resin as a binder and heat-curing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A deflection yoke according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a rear view showing an embodiment of the deflection yoke of the present invention, and FIG. 2 is a plan view showing an E-shaped core used in the deflection yoke of the present invention. FIG.
In FIG. 4, the same parts as those in FIGS. 4 and 5 are given the same reference numerals.

Referring to FIG. 1, the deflection yoke 70 of the present invention
Is a pair of saddle type horizontal deflection coils 2 (shown in FIG. 4) on the inner surface of a separator 1 made of a plastic material (insulating resin).
Are installed facing each other in the vertical direction (Y-axis direction),
A pair of saddle-type vertical deflection coils 3 are installed on the outer surface of the separator 1 so as to face each other in the horizontal direction (X-axis direction), and a core 4 is attached so as to cover the outside of the coils 2 and 3. ing.

The separator 1 is, as described with reference to FIG.
Front funnel 8F from rear neck tube 8N side of CRT8
And a rear cylindrical enlarged portion 1R formed on the side of the rear neck tube 8N to house the rear bend-up portion of the horizontal deflection coil 2 and further rearward along the surface of the neck tube 8N. And a front end enlarged portion 1F that accommodates the front bend-up portion of the horizontal deflection coil 2 formed on the front funnel 8F side. The deflection yoke 70 is inserted from the end of the neck tube 8N to a portion between the funnel 8F and the neck tube 8N, and is mounted so as to wrap the portion from above. It is fixed to the CRT 8 by fastening with the fastening band 5.
Then, each of the R, G, and B electron beams emitted from the electron gun 9 provided in the neck tube 8N is deflected.

Further, the rear cylindrical enlarged diameter portion 1 of the separator 1
Multipole coils (VCR correction coils) 26, 26 'for correcting misconvergence VCR narrows are attached to the rear surface 1RP of the R so as to sandwich the neck tube 8N on the left and right on the X axis. The multi-pole coils 26, 26 'include an E-shaped magnetic core 20, which will be described below, and coils 12a to 12c, 12d to 12f wound around the legs of the E-shaped magnetic core 20, respectively.

The applicant of the present invention has previously filed Japanese Patent Application No. 8-21301.
In No. 6, by adding a compound containing an aminoquinone group having a specific structure to the magnetic powder at a predetermined content, it is possible to maintain a predetermined magnetization (without lowering the packing density of the magnetic substance) and to obtain a sufficient We have proposed a bonded magnetic material that can obtain a large electric resistance value, and thus has a small eddy current loss and excellent magnetic properties. The present invention relates to a multi-pole coil (VC) mounted on a deflection yoke of a color cathode ray tube requiring high definition display.
The magnetic material of the prior application is applied to an E-shaped magnetic core of an R correction coil. That is, in the deflection yoke of the present invention shown in FIG. 1, the E-shaped core 20 of the multipole coils 26 and 26 'is different from the conventional one.

First, E in the deflection yoke 70 of the present invention is used.
A method of treating the magnetic powder to obtain the mold core 20 will be described. As the aminoquinone group, at least one of the aminoquinone groups represented by the following formulas (1) and (2):
A magnetic powder is subjected to a surface treatment with a surface treatment agent containing the compound containing a compound as a structural unit.

[0027]

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[0028]

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In the formula (1), Y is a hydrogen atom, a linear, cyclic or branched C ₁ -C ₆ alkyl group, an aralkyl group or a phenyl group, and Z ₁ is C ₂
-C ₁₆ alkylene group or a phenylene group, an aralkyl group, alkarylene group, or _{- (CH 2 CH 2 -O)} n -
CH ₂ —CH ₂ — (n is an integer of 1 to 50). In the formula (2), Z ₂ is a linear or branched C ₁ -C ₆ alkylene group.

Specifically, it is desirable to use a polymer such as polyurethane obtained by reacting an aminoquinone group-containing diol represented by the above formulas (1) and (2) with an isocyanate. The content of the compound containing an aminoquinone group with respect to 100% by weight of the magnetic powder is 10% by weight or less. More preferably, it is 0.1 to 10% by weight, and further preferably, 0.1 to 5% by weight.

The aminoquinone groups represented by the above formulas (1) and (2) may contain only one or both of them, and the content of the aminoquinone group in the compound is determined to be monomeric. Is preferably at least 5% by weight, more preferably at least 10% by weight. The higher the content of the aminoquinone group monomer, the more effective. However, if the content is too large, it becomes difficult to polymerize. Therefore, the upper limit of the content is about 50%. Therefore, a more preferable content of the aminoquinone group monomer is 5 to 40% by weight.

The surface treating agent for surface treating the magnetic powder is adjusted by dissolving a compound containing an aminoquinone group in a solvent. A diol monomer obtained by introducing hydroxyl groups at both ends of the aminoquinone group represented by the formulas (1) and (2) is reacted with diisocyanates together with other various diols to prepare a polyurethane polymer.
Examples of the other diols include butanediol, butylene adipate, caprolactone, polyester, polyether, glycol, polycaprolactone, polyesteramide, polyalkanediol, polybutadienediol, polyacetal, and the like. As the diisocyanates, methylene diisocyanate, toluene diisocyanate and the like can be used. Then, by dissolving the polyurethane polymer in a solvent such as anone, a surface treating agent for the magnetic powder is obtained.

A more specific embodiment will be described. As aminoquinone (AQ) monomers, diol monomers (AQ-01) represented by the following formula (3) and (4)
A compound containing at least one of the diol monomers (AQ-02) represented by the formula as a structural unit is used.

[0034]

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[0035]

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Various diols having a molecular weight of 50
0 to 5000) and diisocyanates,
A polyurethane polymer having a molecular weight of about 5,000 to 50,000 is synthesized. Then, the solvent concentration is adjusted so that the polyurethane weight% with respect to 100% by weight of the magnetic powder is contained in the range of 0.1 to 10.0% by weight, to prepare a surface treatment agent. 1 kg of the magnetic powder and 250 g of the surface treating agent obtained as described above are mixed and dispersed, and thereafter, the solvent in the surface treating agent is evaporated. Thus, the pretreatment (surface treatment) is performed on the magnetic powder.

Further, the magnetic powder pretreated as described above is mixed with a thermosetting polymer resin (for example, an epoxy resin) as a binder to produce granules having a predetermined particle size.
The granules were pressure-molded in a mold, and then heat-cured to produce a molded product of a predetermined shape of a bonded magnetic material. In this case, the molded article is cured at a relatively low temperature of about 150 to 160 ° C. for about 1 to 2 hours.

As a result, those treated with a surface treating agent containing an aminoquinone group have 6 to 2600
It became clear that double resistivity was obtained. In addition, it is clear that the surface treated with the aminoquinone group-containing surface treating agent has a specific resistance of 3 to 1300 times that of the surface treated with the aminoquinone group-free surface treating agent. became.

That is, the bond magnetic material using the above-described surface treatment technology has a specific resistance of 10 to 100 which is a disadvantage of the soft magnetic material.
[ΜΩ · cm] can be improved to about 10 ⁸ to 10 ⁹ [μΩ · cm], and it has been clarified that excellent magnetic properties of the soft magnetic material can be utilized even in a high frequency region.

Further, when it is desired to improve the specific resistance value or the mechanical strength of the bonded magnetic material, the magnetic powder is subjected to a surface treatment with a silane coupling agent in advance, and an aminoquinone group is used as a structural unit. Surface treatment with a surface treatment agent containing a compound having the same. The magnetic powder may be surface-treated with a surface-treating agent containing a compound having an aminoquinone group as a constituent unit, and further surface-treated with a silane coupling agent. Further, the surface treatment may be performed with a surface treatment agent obtained by integral blending the above surface treatment agent with a silane coupling agent in an amount of about 0.1 to several percent. In this case, the interaction between the aminoquinone group and the silane coupling agent allows the surface treatment agent containing the aminoquinone group to be more uniformly applied to the magnetic powder, and the specific resistance value to be higher than the above value. Further, it can be improved by one or more digits.

Further, the magnetic powder is subjected to a surface treatment with a surface treating agent containing a compound having an aminoquinone group as a constitutional unit, pressure-formed using a polymer resin containing a silane coupling agent as a binder, and heat-cured. Is also good. In the case where the silane coupling agent is used, the bonding force between the magnetic powder and the polymer resin is improved by the action of the silane coupling agent, and the mechanical strength can be improved.

Therefore, the average particle size of the magnetic powder is 70 μm.
1 kg of this reduced iron powder and 40 g of a surface treatment agent whose solvent concentration was adjusted to contain 3.0% by weight of polyurethane containing 30% of AQ monomer per 100% by weight of reduced iron powder. The reduced iron powder was pre-treated (surface treated) by mixing and dispersing and then evaporating the solvent in the surface treating agent. Next, the pretreated reduced iron powder 1k
20 g (including a curing agent) of the epoxy resin was kneaded and dispersed with respect to the g, to obtain granules having an average particle diameter of 74 μm. The granules are press-molded in a predetermined mold, and thereafter, at a temperature of 1
An E-shaped magnetic core 20 made of an AQ bonded magnetic material having a shape as shown in FIG.
It was created.

This E-shaped core 20 is replaced with the E-shaped core 11 of the conventional multipole coils 6, 6 'shown in FIG.
The inductance in Hz was measured to calculate the effective magnetic permeability μe. As a comparative example, multi-pole coils 6 and 6 ′ using an E-shaped magnetic core 11 in which four soft magnetic pieces 10 punched out of a silicon steel sheet having a thickness of 0.5 mm are also similarly stacked.
The effective magnetic permeability μe at a frequency of 1 kHz was calculated. Table 1 shows the results. The effective magnetic permeability μe was calculated by the following equation. Effective permeability μe = (Inductance of multi-pole coil with magnetic core) / (Inductance of multi-core coil with air core)

[0044]

[Table 1]

Table 1 also shows the results of measuring the resistance value between both ends in the longitudinal direction of the E-shaped core 20 made of an AQ bonded magnetic material and the E-shaped core 11 as a comparative example. Note that the term “between both ends in the longitudinal direction” refers to the leftmost coils 12a to 12a in FIG.
It is between both ends of the portion where 12c, 12d to 12f are not wound. Further, the resistance value of the E-shaped magnetic core 20 in this embodiment is:
This is a measured value when a voltage of 100 V is applied. And
When the E-shaped magnetic core 20 of this embodiment and the E-shaped magnetic core 11 of the conventional example are used, the shift amount and direction of the G color line with respect to the R / B color line at the left end of the screen are as shown in Table 1, respectively. Value.

In the E-type magnetic core 20 made of an AQ bonded magnetic material, a thin film containing a compound having a substantially uniform aminoquinone group as a constituent unit is formed on the surface of the magnetic powder. In addition, the resistance value between the both ends in the longitudinal direction is changed to the E-type magnetic core 1 of a soft magnetic material made of a conventional silicon steel plate.
It can be improved by about 9 digits compared to 1.

As a result, in the E-shaped magnetic core 20, the generation of the magnetic field due to the eddy current in the high frequency region is extremely small.
When the displacement of the vertical R color line and the B color line at both ends on the X-axis of the screen in the X-axis direction (misconvergence X _H ) is matched, the R / B color lines are formed at both the left and right edges of the screen. On the other hand, the G color line hardly shifts to the right. For this reason, even if some misconvergence remains, the misconvergence can be easily corrected by various means, and a high-definition deflection yoke for a color cathode ray tube with little color shift can be obtained in a short adjustment time. . In addition, since the process yield is improved, the production cost can be reduced.

Further, the surface treating agent containing a compound having an aminoquinone group as a structural unit has a high degree of bonding with a polymer material such as an epoxy resin used as a binder, and therefore, a high mechanical strength can be obtained with a small amount of the binder. And excellent impact resistance. Therefore, the E-shaped magnetic core 20 of the present invention
Is easy to handle with less occurrence of cracks and chips, and requires a small amount of binder, so that the powder density of the magnetic powder can be increased, and the E-shaped core 20 can be made thinner and smaller.

In the E-shaped magnetic core 20 made of an AQ bonded magnetic material, the effective magnetic permeability μe increases as the average particle size of the magnetic powder is increased and the packing density of the magnetic powder is increased. Eddy currents also increase, and it becomes difficult to make thin magnetic pieces in terms of mechanical strength. The average particle size is 5 μm
In this case, the demagnetizing field becomes large, the effective magnetic permeability μe becomes small, and it becomes difficult to secure a necessary correction amount.
Accordingly, the average particle diameter of the magnetic powder when the E-shaped core 20 is formed is within the range of 10 μm to 250 μm, and the optimal amount of the deviation of the electron beam of G is adjusted according to the size and thickness of the E-shaped core 20. What is necessary is just to select suitably so that a direction may be obtained. Also,
If the effective magnetic permeability μe is 8 or more, it becomes sufficiently practical as a VCR correction coil.

In this embodiment, the case where the reduced iron powder is used as the magnetic powder for forming the E-shaped magnetic core 20 has been described. However, the present invention is not limited to this.
-Fe alloy), silicon steel or silicon iron (Fe-Si alloy), sendust (Fe-Si-Al alloy), alpalm (Fe
-Al alloy) can be used, and the material of the magnetic powder may be appropriately selected so that the optimal G electron beam deviation amount and direction can be obtained according to each usage. This is called a soft magnetic material, and the magnetic material used for the E-shaped magnetic core may be iron powder or iron-based alloy magnetic powder.

Further, the concentration of the AQ monomer and the mixing ratio of the thermosetting resin and magnetic powder serving as a binder are not limited to those of the present embodiment. However, if the mixing ratio of the magnetic powder is 60% by weight or less, the magnetic permeability becomes small and a necessary correction amount cannot be secured, so the mixing ratio of the magnetic powder is 60% by weight.
As described above, the content is preferably less than 99.5% by weight. The binder is not limited to the epoxy resin, and is not limited to the liquid but may be a powdered resin.The shape is not limited to the embodiment, and the one having the same function and effect is completely different. The same applies.

Further, in the present embodiment, the multipole coils 26 and 26 'having the E-shaped magnetic core 20 are formed of the AQ bonded magnetic material, but the shape of the magnetic core is not limited to this. That is, a U-shaped magnetic core or an I-shaped magnetic core may be formed by the AQ bonded magnetic material of the present invention.

[0053]

As described above in detail, the deflection yoke according to the present invention comprises a magnetic core wound with a coil and a magnetic powder surface-treated with a surface treatment agent containing a compound having an aminoquinone group as a constituent unit. Since a magnetic core obtained by press-molding a polymer resin as a binder and heat-curing is used, a magnetic field due to an eddy current in a high-frequency region can be reduced. Thus, for example, in the case of the E-shaped magnetic core, it is possible to almost eliminate the rightward shift of the G color line with respect to the R / B color line at both the left and right end portions of the screen. Therefore, it is possible to obtain a high-definition color cathode ray tube deflection yoke with a small color shift and a short adjustment time. In addition, since the process yield is improved, the production cost can be reduced. In addition, since the surface treatment agent containing a compound having an aminoquinone group as a structural unit has a high degree of bonding to a polymer material such as an epoxy resin used as a binder, a high mechanical strength can be obtained with a small amount of the binder, and the Also has excellent impact properties. Therefore, the magnetic core of the present invention is easy to handle with little occurrence of cracks and chips, and can be used with a small amount of binder, so that the compact density of the magnetic powder can be increased, and the magnetic core can be made thinner and smaller. .

[Brief description of the drawings]

FIG. 1 is a rear view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an E-shaped magnetic core used in the present invention.

FIG. 3 is a diagram showing a misconvergence VCR narrow.

FIG. 4 is a partially broken side view showing a conventional example.

FIG. 5 is a rear view showing a conventional example.

FIG. 6 is a plan view showing an E-type magnetic piece used in a conventional example.

FIG. 7 is a plan view showing a multi-pole coil (VCR correction coil) used in a conventional example.

FIG. 8 is a diagram for explaining the operation of the VCR correction coil.

FIG. 9 is a waveform diagram showing a sawtooth wave current flowing in a horizontal deflection coil.

FIG. 10 is a diagram showing a magnetic field generated by an eddy current of an E-shaped core.

11 is a diagram showing a deviation of the G line in a state of correcting the misconvergence X _H of R / B line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separator 2 Horizontal deflection coil 3 Vertical deflection coil 4 Core 5 Tightening band 9 Electron gun 12a-12f Coil 20 E type magnetic core 26 VCR correction coil (multi-pole coil) 70 Deflection yoke

[Procedure amendment]

[Submission date] July 9, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

The magnetic powder to surface treatment to surface treatment agent for is made tone by dissolving a compound containing aminoquinone group in a solvent. Together with the equation (1) and (2) various other diols and diol monomer obtained by introducing a hydroxyl group at both ends of the aminoquinone group represented by the formula, to, prepare polyurethane polymer is reacted with diisocyanates.
Examples of the other diols include butanediol, butylene adipate, caprolactone, polyester, polyether, glycol, polycaprolactone, polyesteramide, polyalkanediol, polybutadienediol, polyacetal, and the like. As the diisocyanates, methylene diisocyanate, toluene diisocyanate and the like can be used. Then, by dissolving the polyurethane polymer in a solvent such as anone, a surface treating agent for the magnetic powder is obtained.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

Various diols having a molecular weight of 50
0 to 5000) and diisocyanates,
A polyurethane polymer having a molecular weight of about 5,000 to 50,000 is synthesized. The polyurethane wt% with respect to the magnetic powder 100 wt% of the solvent concentration Ltd. adjusted to contain 0.1 to 10.0 wt%, to create a surface treatment agent. 1 kg of the magnetic powder and 250 g of the surface treating agent obtained as described above are mixed and dispersed, and thereafter, the solvent in the surface treating agent is evaporated. Thus, the pretreatment (surface treatment) is performed on the magnetic powder.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction contents]

Therefore, the average particle size of the magnetic powder is 70 μm.
Using the reduced iron powder, and the reduced iron powder 1 kg, and the surface treatment agent 40g where the solvent concentration was made adjusted to contain 3.0% by weight based on the reduced iron powder 100 weight% of the polyurethane containing AQ monomer of 30% Was mixed and dispersed, and thereafter, the solvent in the surface treatment agent was evaporated, thereby pre-treating the reduced iron powder (surface treatment). Next, 1 kg of pretreated reduced iron powder
Then, 20 g (including a curing agent) of an epoxy resin was kneaded and dispersed to obtain granules having an average particle size of 74 μm. The granules are press-molded in a predetermined mold, and thereafter, at a temperature of 16 ° C.
It was cured by heating at 0 ° C. for 2 hours to produce an E-shaped magnetic core 20 made of an AQ bonded magnetic material having a shape as shown in FIG.

Claims (4)

[Claims] 1. A deflection yoke which is mounted on a color cathode ray tube in which a plurality of electron guns are arranged in an in-line manner, and has a magnetic core wound with a coil for correcting misconvergence on a screen of the color cathode ray tube. In the deflection yoke, as the magnetic core, a magnetic powder surface-treated with a surface treating agent containing a compound having an aminoquinone group as a constituent unit, pressure-molded using a polymer resin as a binder, and heat-cured to obtain a magnetic core. A deflection yoke, wherein the deflection yoke is used. 2. The deflection yoke according to claim 1, wherein the average particle size of the magnetic powder is 250 μm or less. 3. The deflection yoke according to claim 1, wherein the mixing ratio of the magnetic powder is not less than 60% by weight based on the whole of the correction magnetic piece. 4. The deflection yoke according to claim 1, wherein the compounding ratio of the compound having an aminoquinone group as a constitutional unit is 0.1% or more by weight relative to the magnetic powder.