JPS61230245A - Deflection york device - Google Patents

Abstract

PURPOSE:To produce good picture quality over the entire picture screen by installing a pair of auxiliary magnetic field generators, arranged perpendicularly to the axes of electron guns, in the back of a deflection york and applying magnetic fields based on vertical or horizontal deflecting currents to the beam. CONSTITUTION:Auxiliary magnetic field generators 15 and 16 installed outside the neck 17 of a color picture tube, which includes three electron guns arranged in a line and has no field controllers inside, are located in the back of the deflection york 10 of the color picture tube. The generators 15 and 16 consist of U-shaped cores 18 and 19 and auxiliary coils 20 and 21 respectively and the legs 18a and 19a of the generators 15 and 16 face the end beams (B) and (R). The coils 20 and 21 are connected to a vertically deflecting coil 12 in series, so that equal magnetic fields in counter directions are applied to each of the beams (B) and (R). Consequently, it is possible to increase the sensitivity of the beam (G) and to effectively correct the upper and the lower misconvergence levels of the beam (G) on the picture screen.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a deflection yoke device used in color television receivers, color cathode ray tube display devices, etc. in which three electron guns are arranged in-line. .

<Prior Art> As is well known, in a deflection yoke which is mounted on a color picture tube having three electron guns in an in-line arrangement and deflects the beams generated by each electron gun, a horizontal deflection filter is used as a whole. It is configured so that it becomes a pincushion-shaped deflection magnetic field,
In addition, by configuring the vertical deflection fill to be a barrel-shaped deflection field, and in addition to this, within the neck of the picture tube, the deflection sensitivity of the central beam and the side beams can be increased on the picture tube wAIID. A field controller (hereinafter referred to as FC) is made by combining multiple magnetic materials that match each other.
By incorporating a sensor (referred to as .

On the other hand, in recent years, for example, in order to obtain high-definition and high-resolution screens, the horizontal scanning frequency has been increased to the usual 15.75K.
Hz to 64 KHz, but when the horizontal scanning frequency is increased in this way, eddy currents are generated in the FC, causing a large shift of the central beam in the horizontal direction. This has various effects on other convergence characteristics (causing misconvergence), and as a result, it becomes extremely difficult to obtain good screen characteristics without misconvergence over the entire screen.

Conventionally, in order to eliminate such misconvergence and obtain good screen characteristics, a color picture tube without an FC in the neck has been used in combination with a deflection yoke.

<Problems to be solved by the invention> However, in such a conventional configuration, the FC
Although the misconvergence caused by There was a problem that the sensitivity was insufficient for the positioned beams (B, R) and misconvergence occurred.〇Means for solving the problem〉 The present invention was made to solve the above problem. Something,
Three electron guns are arranged in-line and located on the rear side of the deflection yoke mounted on the color picture tube without a field controller inside, and are used to generate vertical or horizontal deflection current or deflection for the beam generated by the electron guns. A pair of auxiliary magnetic field generating means is arranged in the electron gun by applying a magnetic field based on a correction current synchronized with the current so that the correction of the sensitivity of the beam located in the center of the beams is larger than the correction of the sensitivity of the beams located on the left and right sides. It is provided perpendicularly to the direction.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, a deflection yoke device 10 includes a core 11, a vertical deflection coil 12 wound toroidally around the outer periphery of the core 11, and a horizontal deflection coil 12 arranged on the inner surface of the core 11 via a coil bobbin 13. A/14 and a pair of auxiliary magnetic field generating means 15 and 16 arranged and fixed on the surface of the rear enlarged part 138 of the coil bobbin 13, and three electron guns (B, G, R) of blue, green, and red. are arranged horizontally in a line (in-line) and are mounted and fixed on the neck portion 17 of the color picture tube, in which no field controller is present. Of these, the vertical deflection field #12 generates a barrel-shaped vertical deflection circuit, and the horizontal deflection coil 14 generates a pincushion-shaped horizontal deflection magnetic field, as in the conventional case. Rear enlarged portion 13a1 of coil bobbin 13! As shown in FIG. 2, the auxiliary magnetic field generating means 15 and 16 disposed on the plane face each other at right angles to the arrangement direction of the three electron guns (B, G, R) on the outside of the picture tube neck part 17. will be placed. Also·
The auxiliary magnetic field generating means 15.16 is composed of a substantially U-shaped core 18.19 and an auxiliary coil 20.21 wound around the core 18.19, and the core 18.19 is connected to the leg piece 18a. , 19a are set so as to substantially oppose the electron guns (B, R) located on both sides of the three electron guns. The auxiliary filters 20.21 of the auxiliary magnetic field generating means 15.16 are connected in series with the vertical deflection coil 12 connected to the vertical deflection circuit 22, as shown in FIG. Similarly to the vertical deflection filter 12, a vertical deflection current flows through the filters 20 and 21. At this time, the amount of current flowing through the auxiliary coils 20, 21 can be adjusted by connecting a volumetric volume 23 in parallel to the auxiliary coils 20, 21, if necessary.

Next, the operating state of the deflection eye device of the present invention will be explained. The auxiliary filter 20.21 that constitutes the auxiliary magnetic field generating means 15.1 A vertical deflection current of . When a sawtooth vertical deflection current flows through the auxiliary filter 20.21, magnetic fields ρA and ΩB are generated in the core 18.19, as shown in FIG. This magnetic field ρA*G'
Since the leg pieces 18a and 19a of the core 18 and 19 are set at a position that substantially opposes the electron guns (B, R) located on both sides, the blue light generated by the electron guns (B, R,) Beams B and red beams R have the same size but opposite directions, so they cancel each other out, and the green beam G generated by the electron gun (G) located in the center has the same direction in the horizontal direction. Each beam B overlaps.

Regarding G and R, as shown in FIG. 5, the green beam G receives the most magnetic field, and the other blue beams B and red beam R receive almost no magnetic field. As a result, the sensitivity of the green beam G is increased by the action of the magnetic fields ρA and ρB, and as shown in Fig. 6,
The mismatch divergence of green beam G is corrected in the direction of the arrow at the upper and lower points of the screen, and finally each beam B, G
, R can obtain good convergence characteristics and single-screen characteristics.

In one embodiment of the deflection yoke device of the present invention, an auxiliary fill constituting an auxiliary magnetic field generating means is connected in series with a vertical deflection coil, and a vertical deflection current is passed through the auxiliary fill to generate a magnetic field. As mentioned above, the auxiliary coil may be connected in parallel to the vertical deflection coil, and the current flowing through the auxiliary fill is not limited to the vertical deflection current only, and the auxiliary coil may be connected to the horizontal deflection coil. It can be connected to flow a horizontal deflection current, or it can also flow a correction current synchronized with the vertical deflection current and horizontal deflection current without connecting to the vertical deflection coil or horizontal deflection filter. Also, the same effect as in the embodiment (increased sensitivity of the central beam) can be obtained. Furthermore, in one embodiment of the present invention, the auxiliary magnetic field generating means is arranged and fixed on the rear surface of the enlarged rear part of the coil bobbin, but the fixing position of the auxiliary magnetic field generating means is not limited to the embodiment, and the position of the auxiliary magnetic field generating means is not limited to the embodiment. It is sufficient that it is located on the rear side, and for example, it may be arranged and fixed integrally with a convergence pilot magnet device attached to the rear part of the deflection yoke. Further, the winding shape of the deflection film is not limited to the embodiment, and the vertical deflection film may be wound in a hollow shape.

<Effects of the Invention> The deflection yoke device of the present invention is as described in detail above, and generates a unique magnetic field unrelated to the deflection magnetic field generated by the deflection coil, and generates a beam generated by the electron gun located at the center. With an extremely simple configuration, it is possible to obtain good image quality characteristics with no Themis convergence over the entire screen while maintaining the best deflection characteristics, and with high In order to obtain a high-resolution screen, the horizontal scanning frequency is set high, and this device will be effective in the future as a deflection yoke device for a picture tube without an internal FC.

[Brief explanation of drawings]

FIG. 1 is a schematic rear view of an embodiment of the deflection yoke device of the present invention, FIG. 2 is a schematic diagram of the auxiliary magnetic field generating means, and FIG. 3 is a schematic diagram of the auxiliary coil forming part of the auxiliary magnetic field generating means. 4 is an explanatory diagram of the operation of the auxiliary magnetic field generating means, FIG. 5 is an explanatory diagram of the amount of magnetic field generated by the auxiliary magnetic field generating means applied to each electron beam, and FIG. 6 is an explanatory diagram of the amount of magnetic field generated by the auxiliary magnetic field generating means applied to each electron beam. FIG. 7 is an explanatory diagram of a state where three electron beams are converged, and FIG. 7 is an explanatory diagram of a state where the central beam is not converged due to no FC provided in the picture tube.

Claims (1)

[Claims] Three electron guns, blue, green, and red, are arranged horizontally in a line and are located on the rear side of a deflection yoke mounted on a color picture tube without a field controller inside. A magnetic field based on a vertical or horizontal deflection current or a correction current synchronized with the deflection current is applied to the beam, and the correction of the sensitivity of the beam located at the center of the beams is made larger than the correction of the sensitivity of the beams located on the left and right sides. A deflection yoke device characterized in that a pair of auxiliary magnetic field generating means are provided perpendicularly to the arrangement direction of the electron guns.