KR970008574B1 - Deflection yoke - Google Patents

Abstract

A deflecting yoke comprises a vertical deflection coil which produces vertically deflected magnetic field which enables the electronic beam to scan exactly the pixel on the screen, and multiple numbers of correction coils which produce correcting magnetic field to correct vertically misconverted electronic beam. At this time when each coil is arrayed in the order or the largest voltage drops a vertical deflection coil(4), a coil(7), a PCS coil(6), that the generation of the interfering electronic wave can be kept below the appropriate level.

Description

Deflection yoke

1 is an exploded perspective view of a general deflection yoke,

2 is a circuit diagram of a general deflection yoke,

3 is a schematic diagram of an EM filter for preventing a conventional electromagnetic interference,

4 is a circuit diagram of a deflection yoke according to the present invention.

* Explanation of symbols for main parts of the drawings

1: deflection yoke 2: coil separator

3: horizontal deflection coil 4: vertical deflection coil

5: ferrite core 6: PCS coil

7: Coma precoil 8: EM filter

The present invention relates to a deflection yoke, and more particularly, to correct vertical deflection coils and misconvergence correction in order to improve the electromagnetic interference (EMI) generated by the matching state of the deflection yoke and the monitor new time. It relates to a deflection yoke for changing the arrangement order of the coils.

In general, as shown in FIG. 1, the deflection yoke 1 includes a pair of coil separators 2 including a neck portion and a screen portion, and a pair of horizontal deflection coils inside and outside the coil separator 2, respectively. 3) and the vertical deflection coil 4 are wound.

In addition, a pair of ferrite cores 5 are mounted on the outer circumferential surface of the coil separator 2 so as to surround the outer circumferential surface of the vertical deflection coil 4 to reinforce the magnetic field generated by the vertical deflection coil 4. The core 5 is fixed by a core clamp (not shown).

The deflection yoke 1 having such a structure is mounted on the cathode ray tube neck portion, and when a sawtooth pulse is applied to the horizontal deflection coil 3 and the vertical deflection coil 4, the magnetic field is generated by the Fleming's left hand law. The emitted red (R), green (G), and blue (B) electron beams are deflected by a magnetic force to form a screen.

In addition, the deflection yoke 1 is equipped with various misconvergence correction devices for correcting them according to the misconvergence state of the scanned electron beam. In the case where misconvergence occurs in the vertical direction of the electron beam, the misconvergence correction device is provided. It is composed of the arrangement sequence as shown in FIG.

In other words, Comapri for correcting misconvergence (PCS Coil: Precision Convergence System Coil: 6) and green (G) beam among red (R), blue (B), and green (G) beams The circuit was arranged in the order of the coil (Coma Free Coil 7) and the vertical deflection coil 4 for deflecting the electron beam in the vertical direction.

However, in the deflection yoke configured as described above, there was a problem in that noise was generated on the screen due to electromagnetic interference (EMI).

In order to solve the above problems, conventionally, an EMI filter (8) as shown in FIG. 3 is installed in a place where electromagnetic interference occurs so that electromagnetic waves that cause interference pass to the ground, thereby preventing electromagnetic interference. Prevented.

By the way, in the above case, although the level of the interference electromagnetic wave is reduced, there is a problem that the effect does not reach the appropriate level and can not completely prevent the electromagnetic interference.

In addition, in the above case, there is a problem that the production cost of the deflection yoke is increased by installing a separate EM filter.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to reduce the level of the interference electromagnetic wave to an appropriate level or less by changing the arrangement order of each component circuit without using a separate electromagnetic wave removing means. It is to provide a deflection yoke to prevent.

A deflection yoke according to the present invention for achieving the above object is a vertical deflection coil for generating a vertical deflection magnetic field so as to accurately scan the electron beam to each pixel of the screen, and the electron beam generated misconvergence in the vertical direction A plurality of correction coils for generating a correction magnetic field to be corrected; The coils are arranged in the order of the large voltage drop among the coils.

Hereinafter, a preferred embodiment of the deflection yoke according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a circuit arrangement diagram of the deflection yoke according to the present invention. In FIG. 4, the same reference numerals as those of FIG. 2 denote the same parts, and thus description thereof will be omitted and only essential components of the present invention will be described.

4, the vertical deflection coil 4, the comma precoil 7, and the PC coil 6 are arranged in order of the largest voltage drop.

Table 1 shows the results of experiments on the amount of interference electromagnetic waves using the deflection yoke according to the present invention having such a configuration, the deflection yoke and various types of deflection yokes.

Table-1

That is, as shown in [Table-1], as a result of experimenting with the currently produced deflection yoke, the deflected yoke which varied variously and the circuit related to the vertical deflection, the interference frequency level was appropriate. It can be seen that only the deflection yoke that changes the circuit related to the vertical deflection is reduced below (22 dB).

Here, two cases of changing the circuit related to the vertical deflection (V circuit change I and V circuit changing II) are illustrated in two cases. In the first case (V circuit change I), the EM filter 8 is applied to the circuit related to the vertical deflection. Is to prevent electromagnetic interference, and the second case (V circuit change II) refers to a case where the arrangement order of circuits related to vertical deflection is changed as mentioned in the present invention.

In addition, according to the experimental results shown in [Table-1], the arrangement order of the circuits related to the vertical deflection is arranged in the order of the large voltage drop, and then the results of the experiments for a plurality of deflection yokes having the same arrangement order It is shown in [Table-2] below.

TABLE 2

As shown in [Table-2], although each deflection yoke exhibits a small amount of difference, it can be seen that all of the interference electromagnetic wave levels appear below an appropriate level.

As described above, according to the deflection yoke according to the present invention, a plurality of correction coils for correcting misconvergence generated by the vertical deflection coil and the vertical deflection coil are arranged in the order of the large voltage drop, thereby preventing the interference of electromagnetic waves. There is an advantage to this.

Claims (1)

A vertical deflection coil for generating a vertical deflection magnetic field so as to accurately scan an electron beam to each pixel of the screen, and a plurality of correction coils for generating a correction magnetic field for correcting an electron beam in which misconvergence has occurred in the vertical direction; A deflection yoke in which the coils are arranged in the order of the large voltage drop among the coils.