KR20030088946A - apparatus for deviation yoke of cathode-ray tube - Google Patents

Abstract

PURPOSE: A deflection yoke is provided to effectively prevent interference between the upper and lower ring magnets by ensuring a sufficient space between the upper and lower ring magnets. CONSTITUTION: A holder arranged in the rear of a deflection yoke has an upper stepped surface(37) and a lower stepped surface(39) where upper protrusions(35a,35b) and lower protrusions(36a,36b) are formed, respectively. An upper ring magnet(131) and a lower ring magnet(137) are fixed to the upper protrusions and lower protrusions, respectively, in such a manner that interference between the ring magnets are prevented by forming a sufficient space between the upper ring magnet and the lower ring magnet.

Description

Deflection yoke for cathode tube {apparatus for deviation yoke of cathode-ray tube}

The present invention relates to a CRT, and in particular, to form a step in the outer diameter of the holder of the deflection yoke, which is mounted to the funnel portion of the CRT to deflect the electron beam, and the upper projection and the bottom for fixing the ring magnet on each step surface The present invention relates to a deflection yoke for a CRT tube, which has protrusions to prevent interference between ring magnets.

Generally, a cathode ray tube (CRT) is a device that converts an electrical signal into an electron beam, shoots a fluorescent surface, and converts it into an optical image for display.

Cathode ray tube as described above is the most widely used display device has the advantage of excellent display quality and cost performance ratio is widely used as a general-purpose image display device. Referring to the general principle of the cathode ray tube (CRT) as described above.

In the cathode ray tube, an electron beam emitted from an electron gun is focused through an electron lens in a vacuum glass tube, and the focused electron beam is refracted to be directed to a predetermined position on the fluorescent surface by a magnetic field of a deflection yoke attached to the neck of the glass tube. The refracted electron beam strikes the phosphor on the phosphor surface to emit light.

1 is a schematic diagram of a conventional CRT, as shown in the drawing, a color cathode ray tube includes a panel 16 mounted on a front surface of a cathode ray tube, and red (R) and green (G) surfaces on an inner surface of the panel 16. A fluorescent mask 15 coated with a phosphor of blue color (B), a shadow mask 14 having a color discrimination function of an electron beam incident from the rear of the fluorescent surface 15 to the fluorescent surface 15, and the panel 16 A funnel (13) coupled to the rear surface of the funnel (13) installed to maintain the interior in a vacuum state, an electron gun mounted inside the tubular neck portion retracted to the rear of the funnel (13), and firing an electron beam, and the funnel (13) And a deflection yoke 2 arranged to deflect the electron beam in a horizontal or vertical direction.

The deflection yoke 2 will be described with reference to FIG. 2. 2 is a side view showing a conventional deflection yoke structure, as shown in the drawing, the deflection yoke has a horizontal deflection coil 21 for deflecting an electron beam emitted from an electron gun in a horizontal direction, and deflects the electron beam in a vertical direction. Enclosed by the vertical deflection coil 22 and the vertical deflection coil 22, the magnetic efficiency is reduced by reducing the loss of magnetic force generated in the horizontal and vertical deflection coils 21 and 22 so that the electron beam can be deflected exactly in front of the screen. The conical ferrite core 23 and the position of the horizontal deflection coil 21 and the vertical deflection coil 22 and the ferrite core 23 is fixed to improve the horizontal deflection coil 21 and the vertical deflection coil 20 ) And a correction circuit board 25 for connecting a holder 40 to insulate the circuits and a current through the vertical deflection coil 20 and the vertical deflection coil 22.

On the correction circuit board 25, a balance coil 27 for adjusting the strength of the current of the horizontal deflection coil 21 is mounted.

In the conventional deflection yoke 2 having the above-described configuration, a horizontal deflection current having a frequency of 15.75 KHz or higher is applied to the electric horizontal deflection coil 21 and a magnetic field generated accordingly is used. This deflects the electron beam inside the CRT in the horizontal direction. The electric vertical deflection coil 22 is supplied with a vertical deflection current of about 1 [A] having a frequency of 60 KHz. It deflects the electron beam.

By adjusting the winding distribution of the horizontal deflection coil 21 and the vertical deflection coil 22 to make barrel or pin-cushion type magnetic field for each part (opening part, middle part, neck part), it is the arrival point from the starting point of the electron beam. Self-convergence-type deflection yokes are mainly developed that collect at the same point at different distances to the screen.

Then, a ring magnet 31 for causing the electron beam emitted from the electron gun to converge at one point is coupled to the holder 24 of the deflection yoke 2 to form a forced magnetic field. Here, the ring magnet 31 serves to adjust the electron beam of R, R, B.

The ring magnet 31 is composed of two pairs. The ring magnet 31 is rotated to change the strength and path of the magnetic field by appropriately adjusting the proximity of the N-S poles.

At this time, the intensity and path of the magnetic field affect the electron beam so that the path of the electron beam can be adjusted, and ultimately, the convergence of the electron beam is properly maintained.

More detailed configuration and operation of the ring magnet 31 will be described with reference to the following drawings.

3 is a perspective view of a combination of a conventional ring magnet and the prevention ring, Figure 4 is an exploded perspective view of a conventional ring magnet and the prevention ring, Figure 5 is an enlarged cross-sectional view showing a coupling state of the conventional ring magnet and the prevention ring.

As shown in the figure, the upper protrusion 35 and the lower protrusion 36 are formed on the outer diameter of the holder 24, respectively.

In addition, an upper ring magnet 31a is inserted into the lower ring, and a blocking ring 34 is inserted into the bottom of the upper ring magnet 31a to prevent interference between upper and lower ring magnets. The lower ring magnet 31b is inserted into the bottom.

In this case, the upper and lower ring magnets 31a and 31b and the prevention ring 34 are fixed by the upper protrusion 35 and the lower protrusion 36 formed on the outer diameter of the holder 24.

The upper ring magnet 31a and the lower ring magnet 31b have a pair of two magnet rings 31a ', 31a "and 31b', 31b" opposed to each other.

However, in the structure of the conventional deflection yoke having the above configuration, it is absolutely necessary to insert a separate prevention ring 34 in the middle to reduce the interference between the upper ring magnet 31a and the lower ring magnet 31b. There is a problem that causes a material cost increase in the production of.

In addition, there is a problem such as increase in labor costs and time delay of the assembly process because it has to go through a complicated work process to manufacture and assemble the prevention ring (34).

The present invention has been proposed to solve the above problems, an object of the present invention is to form an upper, lower stepped surface in the outer diameter of the holder of the deflection yoke, and the upper and lower projections formed on the respective stepped surface It is to provide a deflection yoke for the CRT tube, so that the lower ring magnets are fixed, so that interference between the ring magnets can be prevented without the use of a conventional prevention ring.

Another object of the present invention is to provide a deflection yoke for a CRT tube that forms a lower protrusion in an outer diameter of the holder in four directions so that the ring magnet can be rotated stably and to increase the tightening efficiency when assembling the upper and lower ring magnets. .

1 is a schematic view of a conventional CRT.

Figure 2 is a side view showing a conventional deflection yoke structure.

Figure 3 is a perspective view of a combination of the conventional ring magnet and the prevention ring.

Figure 4 is an exploded perspective view of a conventional ring magnet and the prevention ring.

Figure 5 is an enlarged cross-sectional view showing a coupling state of the conventional ring magnet and the prevention ring.

Figure 6 is an exploded perspective view of the ring magnet in the holder according to the present invention.

Figure 7 is an enlarged cross-sectional view showing a ring magnet coupling state in the holder according to the present invention.

* Description of the symbols for the main parts of the drawings *

11: electron gun 13: funnel

16: panel 2: deflection yoke

21: horizontal deflection coil 22: vertical deflection coil

23: ferrite core 24: holder

25: calibration circuit board 31: ring magnet

32: neck part 34: prevention ring

35: upper protrusion 36: lower protrusion

The deflection yoke for the CRT according to the present invention for achieving the above object is an electron gun that emits three electron beams of R, G, and B, and a deflection for deflecting the electron beam to a predetermined place on the screen using horizontal and vertical deflection currents. In a cathode ray tube comprising a yoke, a shadow mask that separates three electron beams deflected by the deflection yoke, and selects colors, and a screen portion on which the electron beams color-selected by the shadow mask strike a fluorescent surface to emit light.

Upper and lower stepped surfaces are formed on the outer diameter of the holder at the rear side of the deflection yoke, and upper and lower protrusions are formed on the upper and lower stepped surfaces, respectively, and upper and lower ring magnets are respectively formed on the upper and lower protrusions, respectively. The coupling is characterized in that the interference between the ring magnets is prevented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 6 is an exploded perspective view of the ring magnet in the holder according to the present invention, Figure 7 is an enlarged cross-sectional view showing a ring magnet coupled state in the holder according to the present invention, as shown in the figure to the outer diameter of the holder 24 Upper and lower stepped surfaces 37 and 39 are formed, and the stepped surfaces 37 and 39 are formed with upper protrusions 35a and 35b and lower protrusions 36a and 36b, respectively.

Then, the upper ring magnet 131 and the lower ring magnet 137 are fixed by using the upper protrusions 35a and 35b and the lower protrusions 36a and 36b, respectively.

In this case, sufficient space is formed between the ring magnet 131 positioned at the upper portion and the ring magnet 137 positioned at the lower portion, thereby preventing interference when the upper and lower ring magnets 131 and 137 are used.

The upper ring magnet 131 and the lower ring magnet 137 are composed of a pair of two magnet rings 131a, 131b, and 137a, 137b facing each other.

Then, by positioning the lower projections 36a and 36b in four directions on the outer diameter of the holder 24 to which the upper ring magnet 131 is to be attached (only one direction is shown in FIGS. 6 and 7), only the two directions are positioned. The lower ring magnet 137 can be rotated more stably than when.

In addition, as the lower protrusions 36a and 36b are formed in four directions as described above, the tightening efficiency of the upper ring magnet 131 and the lower ring magnet 137 is improved when the ring magnet 130 is assembled.

In addition, when the lower projections 36a and 36b in four directions are positioned as in the present invention, it is impossible to insert the lower ring magnet 137 into the lower stepped surface 39 with the current ring magnet. Widen to allow insertion.

In addition, in the above, although the two stages which consist of upper and lower stepped surfaces were formed in the outer diameter of the holder 24, the three stages which consist of upper, middle, and lower stepped surfaces may be formed, and the number of steps may be added.

This is because various types of ring magnets consisting of a dipole portion, a quadrupole portion, a six-pole portion, and the like can be arbitrarily arranged and used.

The present invention forms a stepped surface in the holder of the deflection yoke, and because the ring magnets are independently coupled to each stepped surface, sufficient space between the upper and lower ring magnets is secured to effectively prevent the interference between the ring magnets.

In addition, since the lower protrusion is formed in the outer diameter 4 direction of the stepped surface, the tightening efficiency of the upper ring magnet and the lower ring magnet is improved when assembling the ring magnet, and the ring magnet interference prevention ring is not required when the deflection yoke is manufactured. Therefore, the number of processes can be reduced, and above all, the material cost is greatly reduced.

Claims (4)

In a CRT tube in which the electron beams of R, G, and B emitted from the electron gun are deflected to a predetermined position on the screen by the horizontal and vertical deflection currents of the deflection yoke, Upper and lower stepped surfaces are formed on the outer diameter of the holder at the rear side of the deflection yoke, and upper and lower protrusions are formed on the upper and lower stepped surfaces, respectively, and upper and lower ring magnets are respectively formed on the upper and lower protrusions, respectively. Deflection yoke for the CRT, characterized in that the coupling to prevent interference between the ring magnets. The method of claim 1, The lower ring magnet is a brown tube deflection yoke, characterized in that the inner diameter formed so as to pass through the lower projection formed on the upper step surface. The method of claim 1, Deflection yoke for a CRT tube, characterized in that the lower projection is formed in the four outer diameters of the holder to enable the ring magnet to be rotated stably. The method of claim 1, 3. The deflection yoke for a CRT tube, wherein the holder outer diameter is formed of three stages consisting of upper, middle, and lower stepped surfaces, and upper and lower protrusions for fixing a ring magnet to the stepped surfaces, respectively.