JPH0592946U - Deflection yoke - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a deflection yoke having a high-quality image characteristic using a vertical magnetic field corrector having excellent assembly workability. [Structure] An auxiliary coil is wound around a central side of a U-shaped magnetic core through a coil bobbin in the vicinity of an electron gun side opening of a deflection yoke mounted on an in-line color picture tube, and the U-shaped magnetic A pair of vertical magnetic field correctors, each having a magnetic piece attached between the two legs of the core, are arranged so as to face each other so that the leg portions of the U-shaped magnetic core of the vertical magnetic field corrector are orthogonal to the electron beams in the in-line arrangement. , A current of a vertical deflection period is made to flow in the auxiliary coils of the pair of vertical magnetic field correctors, and a pincushion type vertical correction magnetic field in the same direction as the vertical deflection magnetic field is generated from the leg portion of the U-shaped magnetic core. In the deflection yoke, at least one vertical magnetic field corrector of the pair of vertical magnetic field correctors is provided with a magnetic material piece attachment member for attaching the magnetic material piece to both legs of the U-shaped magnetic core, and the auxiliary coil is provided. For bobbin And the magnetic piece attaching member are integrally formed on the U-shaped magnetic core of the vertical magnetic field corrector.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deflection yoke suitable for an in-line color picture tube.

[0002]

[Prior Art]

 As is well known, the deflection yoke of an in-line color picture tube device generally achieves self-convergence by forming a horizontal deflection magnetic field into a pincushion type magnetic field and a vertical deflection magnetic field into a barrel type magnetic field. However, only such a constituent magnetic field causes a difference in deflection sensitivity between the green (G) center beam and the red (R) and blue (B) side beams of the electron beam in the in-line arrangement, which causes a difference in deflection sensitivity on the screen of the picture tube. Coma aberrations (HCR) and (VCR) as shown in FIG. 5 occur in the horizontal and vertical directions. Of these, it is possible to correct the deviation of the HCR convergence by changing the winding distribution of the horizontal deflection coil, but it is difficult to correct the deviation of the VCR convergence on the deflection coil side. Met. For this reason, by providing a magnetic field control element (hereinafter referred to as FC) made of a magnetic material in the neck portion of the color picture tube as in the prior art, the difference in deflection sensitivity between the center beam G and the side beams R and B is determined. Were corrected to be the same on the picture tube screen.

However, as the definition of the color picture tube device has recently been improved and the applied horizontal deflection frequency has been increased, the FC provided for correcting the deviation of the convergence of the VCR has a high frequency loss. It occurred, and on the contrary, it had the effect of worsening coma. Further, as the color picture tube becomes wider and larger, there is a problem that the upper and lower pincushion distortion of the picture tube screen or the convergence quality deteriorates.

Therefore, for the purpose of improving the deterioration of the convergence characteristics as described above, a deflection yoke as shown in FIG. 4 is adopted in which the coma aberration is adjusted by the magnetic field distribution of the deflection yoke itself instead of F C. Has been done. This will be described in detail with reference to FIG. In FIGS. 4 (a) and 4 (c), reference numerals 2 and 2 denote a pair of vertical magnetic field correctors. The vertical magnetic field correctors 2 1 and 2 are a plurality of L-shaped thin magnetic plate plates and a hollow coil bobbin. The U-shaped magnetic cores 9 and 9 assembled by being inserted into the hollow holes 10 and 10 and the coil bobbins 10 and 10 arranged on the central side of the U-shaped magnetic cores 9 and 9 were wound. It is composed of auxiliary coils 3 and 3. The pair of vertical magnetic field correctors 2 and 2 are arranged near the electron gun side opening of the deflection yoke so that the legs 11 of the U-shaped magnetic cores 9 and 9 are orthogonal to the electron beam in the in-line arrangement. It is set up. Then, by applying a vertical deflection current or a correction current synchronized with the vertical deflection current to the auxiliary coils 3 and 3, from the tips of the legs 11 and 11 of the U-shaped magnetic cores 9 and 9 of the vertical magnetic field correctors 2 and 2, respectively. As shown in FIG. 4C, a vertical correction magnetic field (illustrated by a solid line arrow) is radiated. Due to this vertical correction magnetic field, the vertical magnetic field distribution in the tube axis direction of the deflection yoke is spread to the electron gun side of the picture tube as shown by the solid line in FIG. 4 (b). As a result, as shown in FIG. 4C, the center beam G is subjected to a magnetic force larger than those of the side beams R and B, and the deflection sensitivity of the center beam G is increased, and R, G and B are increased. All the beams of the above are coincident on the surface of the picture tube, and the deviation of the VCR convergence is corrected.

However, in the above-described conventional deflection yoke, the deviation of the VCR convergence can be corrected, but the deviation of the deflection magnetic field center due to the variation of the winding distribution of the deflection yoke, the assembly error, and the like. There is a possibility that cross-miss convergence on the Y-axis of the screen as shown in FIG. 3 may occur, and when the cross-misconvergence occurs, it is necessary to further adjust the vertical deflection magnetic field distribution.

For this reason, as shown in FIG. 2, the U-shaped magnetic core 9 has a substantially U-shaped surface between at least one leg 11 of the pair of vertical magnetic field correctors 2, 2. The magnetic piece 12 is placed in parallel or close to or in contact with each other in a substantially vertical direction with respect to the electron beam of the in-line arrangement, the optimum position is determined by finely adjusting the position manually, and the magnetic piece 12 is moved at the optimum position. The vertical deflection magnetic field distribution was adjusted by fixing it to the V-shaped magnetic core 9 with an adhesive.

In this way, by providing the magnetic piece 12 between at least one leg 11 of the pair of vertical magnetic field correctors 2 and 2, the correction magnetic field distribution from the pair of vertical magnetic field correctors 2 and 2 is provided. Becomes a shape attracted to the magnetic piece 12 and changes as indicated by the broken line arrow shown in FIG. Then, the vertical correction magnetic field distribution from the vertical magnetic field corrector 2 on the side where the magnetic material piece 12 is provided has a barrel tendency as compared with that before the magnetic material piece 12 is provided, as indicated by the broken line arrow a. As a result, the horizontal components FBX and FRX of the forces FB and FR acting on the side beams R and B are reduced as shown in FIG. 2 (b).

On the other hand, the vertical correction magnetic field distribution from the vertical magnetic field corrector 2 on the side where the magnetic piece 12 is not provided changes to a pincushion tendency as compared with before the magnetic piece 12 is provided. As a result, the horizontal components FBX and FRX of the forces FB and FR acting on the side beams R and B increase as shown in FIG. 2C, and the cross-miss convergence as shown in FIG. 3A is corrected. As described above, according to the pair of vertical magnetic field correctors 2 and 2 described above, it is possible to correct the deviation of the VCR convergence and the cross-miss convergence on the Y axis of the screen.

[0009]

[Problems to be solved by the device]

 In the conventional vertical magnetic field corrector, the U-shaped magnetic core is assembled while inserting a plurality of L-shaped thin magnetic plates into the hollow holes of the hollow coil bobbin, which complicates the assembling work as well as the L-shaped magnetic core. Due to the variation in the hole size of the thin flaky magnetic plate or hollow coil bobbin, looseness may occur between the coil bobbin and the U-shaped magnetic core of the assembled vertical magnetic field corrector, Since they do not adhere to each other, the action of the vertical correction magnetic field generated from the tip of the leg of the U-shaped magnetic core is weakened, and the U-shaped magnetic core causes a beat when the deflection yoke operates. Also, the work of adjusting and fixing the mounting position of the magnetic piece on the U-shaped magnetic core leg portion for adjusting the vertical correction magnetic field was complicated and required skill.

The present invention solves these problems and aims to provide an inexpensive deflection yoke having high-quality image characteristics.

[0011]

[Means for Solving the Problems]

 An auxiliary coil is wound around the center side of the U-shaped magnetic core via a coil bobbin near the opening on the electron gun side of the deflection yoke that is mounted on the color picture tube in the in-line arrangement, and both legs of the U-shaped magnetic core are wound. A pair of vertical magnetic field correctors with a magnetic piece attached between the parts are arranged so as to face each other so that the leg portion of the U-shaped magnetic core of the vertical magnetic field corrector is orthogonal to the electron beam in the in-line arrangement. A deflection yoke configured such that a current having a vertical deflection period is passed through the auxiliary coils of a pair of vertical magnetic field correctors to generate a pincushion type vertical correction magnetic field in the same direction as the vertical deflection magnetic field from the leg portion of the U-shaped magnetic core. In at least one of the pair of vertical magnetic field correctors, a magnetic piece attaching member for attaching the magnetic piece is provided on both legs of the U-shaped magnetic core of at least one vertical magnetic field corrector, and the auxiliary coil is attached. For bobbins Serial and magnetic piece mounting member is integrally molded to the shape magnetic core co of the vertical magnetic field correction device. The magnetic piece may be slidably arranged on the magnetic piece mounting member.

[0012]

[Action]

 Since the coil bobbin for winding the auxiliary coil and the magnetic piece attaching member for attaching the magnetic piece for adjusting the vertical correction magnetic field are integrally formed on the U-shaped magnetic core of the vertical magnetic field corrector, the vertical magnetic field corrector The manufacturing workability of is greatly improved. In addition, since the magnetic piece attachment member is integrally molded on the U-shaped magnetic core leg, the thin magnetic plates that form the U-shaped magnetic core are closely fixed to each other and vertical correction is performed. The action of the magnetic field is increased, the characteristics are stabilized, and the beat of the U-shaped magnetic core is prevented. Further, since the magnetic body can be slidably arranged, the workability of adjusting the vertical correction magnetic field is improved.

[0013]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part of a deflection yoke of the present invention. In the figure, 2 and 2 are a pair of vertical magnetic field correctors, 3 and 3 are auxiliary coils, 4 is a coil separator, and 9 and 9 are U-shaped magnetic cores composed of a plurality of flaky magnetic plates. A coil bobbin 10, 10 for winding the auxiliary coils 3 and 3 is provided on the central piece of the U-shaped magnetic core 9, 9 and magnetic is provided on the leg portions 9B, 9B on the two sides of the U-shaped magnetic core 9, 9. The magnetic piece attaching members 1A, 1A provided with grooves 1B, 1B for guiding the respective ends of the body piece 12 are integrally formed. The locking members 1C and 1C of the vertical magnetic field correctors 2 and 2 are integrally formed on the coil separator 4, and the vertical magnetic field correctors 2 and 2 are locked to the coil separator 4 by the locking members 1C and 1C. To be done.

The pair of vertical magnetic field correctors 2 and 2 configured as described above is provided with two U-shaped magnetic cores 9 and 9 near the electron gun side opening of the deflection yoke by the locking members 1C and 1C. The leg portions 9B, 9B on the sides are fixed so as to be orthogonal to the electron beams in the in-line arrangement. The space between at least one of the leg portions 9B and 9B of the U-shaped magnetic core 9 of the vertical magnetic field correctors 2 and 2 is substantially parallel to the U-shaped surface of the U-shaped magnetic core 9 and is made of a magnetic material. A magnetic material piece 12 slidably housed in the guide grooves 1B, 1B of the one-side mounting members 1A, 1A is close to the U-shaped magnetic core leg portions 9B, 9B, and the electron beam is arranged inline. It is installed almost vertically with respect to. By sliding the attached magnetic material piece 12 along the guide grooves 1B and 1B, the magnetic material piece 12 is fixed at this position because it is adjusted to the optimum vertical correction magnetic field with corrected cross-miss convergence. Let

In the above-described embodiment, the cross-miss convergence on the Y-axis of the screen has been explained as shown in FIG. 3A. However, in the case of the cross-miss convergence as shown in FIG. 12 can be corrected by arranging 12 in the vertical magnetic field corrector 2 on the opposite side of the embodiment.

The magnetic piece attaching members 1A and 1A are preferably formed in such a manner that the gap between the U-shaped magnetic cores 9 and 9 and the magnetic piece 12 is in the range of 1 to 2 mm in terms of the correction effect and 2 mm. Even if the cross-miss convergence on the Y axis of the screen is corrected, the correction magnetic field extending in the electron gun tube axis direction of the deflection yoke by the auxiliary coil is affected, and the pincushion type deflection distortion on the screen and in the downward direction increases. Adversely affect

It goes without saying that the vertical magnetic field correctors 2 and 2 may be provided on the neck side or the screen side of the coil separator 4.

[0018]

[Effect of the device]

 The deflection yoke of the present invention has a simple process of integrally forming the coil bobbin for auxiliary coil winding and the magnetic material piece mounting member on the U-shaped magnetic core, thereby greatly improving the assembly workability of the vertical magnetic field compensator. In addition, there is a practical effect that the deflection yoke having the improved U-shaped magnetic core does not have a U-shaped magnetic core and the characteristics are stable and the image quality is high.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a deflection yoke of the present invention.

FIG. 2 is an explanatory diagram of an operation of a magnetic piece that corrects cross-miss convergence.

FIG. 3 is an explanatory diagram of cross-convergence characteristics.

FIG. 4 is an explanatory diagram of a conventional deflection yoke.

FIG. 5 is an explanatory diagram of coma aberration.

[Explanation of symbols]

 1A, 1A Magnetic piece attachment member 2,2 Vertical magnetic field corrector 3,3 Auxiliary coil 9,9 U-shaped magnetic core 9B, 9B U-shaped magnetic core leg 10,10 Coil bobbin 12 Magnetic piece

Claims (2)

[Scope of utility model registration request] 1. An auxiliary coil is wound around a central side of a U-shaped magnetic core through a coil bobbin in the vicinity of an electron gun side opening of a deflection yoke attached to an in-line color picture tube, and the U-shaped coil is provided. A pair of vertical magnetic field compensators each having a magnetic piece attached between both legs of the mold core are opposed to each other so that the leg portions of the U-shaped magnetic core of the perpendicular magnetic field compensators are orthogonal to the electron beams in the in-line arrangement. The auxiliary coil of the pair of vertical magnetic field correctors is provided with a current of a vertical deflection period so that a pincushion type vertical correction magnetic field in the same direction as the vertical deflection magnetic field is generated from the leg portion of the U-shaped magnetic core. In the constructed deflection yoke, at least one vertical magnetic field corrector of the pair of vertical magnetic field correctors is provided with a magnetic material piece attachment member for attaching the magnetic material piece to both legs of the U-shaped magnetic core, and Auxiliary coil A deflection yoke, wherein the bin and the magnetic piece mounting member are integrally formed on the U-shaped magnetic core of the vertical magnetic field corrector. 2. The deflection yoke according to claim 1, wherein the magnetic piece is slidably disposed on the magnetic piece mounting member.