KR100324480B1 - Convergence device for a color picture tube - Google Patents

Abstract

The present invention discloses an improved convergence device of color brown tubes.

In the related art, by fixing the holder to the neck by a metal band separate from the configuration of fixing the adjustment magnet to the holder, there is a problem that adjustment is difficult and deviation of the adjustment state occurs.

In the present invention, the conventional problem is solved by fixing the holder to the neck by coupling the non-metal holder locker separately or integrally with the holder fixing of the adjusting magnet.

Description

Convergence device for a color picture tube}

The present invention relates to a convergence device of a color CRT.

The color CRT, which realizes a color image, has an aperture type that alternately emits R, G, and B phosphors in a single beam, a trio type in which three independent electron guns are arranged in a trio form, and Three electron guns can be distinguished in an in-line form arranged laterally.

Among them, trio type and upper type are mainly used for industrial color brown tube such as monitor, and inline type is mainly used for consumer use such as color TV.

In-line color CRT forms three electron guns in which the electron gun assembly is arranged side by side. As shown in FIG. 1, the electron beam 20 emitted from the three electron guns 10 is in a raster state. It should be converged to a point on the fluorescent surface 40 (actually a position on the corresponding phosphor in one pixel, that is, three fluorescent points in one pixel) through a shadow mask 30.

In this case, the electron beam 20 scans each position on the fluorescent surface 40 by horizontal and vertical deflection means 50. In this scanning, three electron beams 20 should be converged at one point at each position. .

Accordingly, the color-brown tube is provided with static and dynamic convergence means, and the static convergence means are referred to as three pairs of two poles, four poles and six poles (P2, P4, P6; It is generally composed of a convergence device called CPM (Convergence Purity Magnet).

Here, each pair P2, P4, P6 of the convergence device is partially magnetized and is composed of two magnet rings forming two kinds of poles, N and S.

First, the bipolar pair P2 shown in FIG. 2 (A) is called a purity magnet, and as shown in FIG. 2A, three R, G, and B beams are generated by the magnetic flux between the N pole and the S pole. Will move in one direction.

Meanwhile, the 4-pole pair P4 shown in FIG. 2B moves two beams of R and B outside in opposite directions, and the 6-pole pair P6 of FIG. The two beams are moved in the same direction, and the 4-pole pair P4 and the 6-pole pair P6 are called convergence magnets together.

In this case, the convergence device adjusts the misalignment of the three R, G, and B electron beams due to an error in the manufacturing process of the color CRT, and each pair (P2, P4, P6) is composed of a pair of magnet rings. The reason for this is to adjust the convergence by adjusting the beam shift amount for different manufacturing errors for each CRT by adjusting the relative angle therebetween.

3 (A) and (B) show the general structure of such a convergence device.

3 (A) and (B) adjustment magnet rings (R; P2, P4, on the outer periphery of the sleeve (S) corresponding to the front end of the holder (H) installed on the neck (N) of the CRT) P6 are rotatably installed, and a locker L is screwed to the rear end of the sleeve S to rotate the adjustment magnet rings R; P2, P4, and P6. ) To fix the adjustment.

On the other hand, in order to fix the holder H itself to the neck N, a band B is wound around the outer periphery of the holder H, and the band B is bolted to the neck N with a bolt P. By tightening the band B with respect to the convergence device is fixed to the neck (N).

Here, the band (B) and bolt (P) is made of metal, but these are made of nonmagnetic materials such as stainless alloy steel. Therefore, since the metal has considerable permeability, it affects the path of the electron beam. Can not be crazy

Therefore, even if the electron gun manufactured with the same precision, the path of the electron beam is changed according to the installation direction of the band B and the bolt P, and the required adjustment state is inevitably changed. The installation of the bolt P also has an unreasonable problem that requires very high assembly precision.

In addition, since the fastening of the bolt P to the band B is applied with a strong force in the tangential direction of the holder H, the holder H rotates as a whole and is fixed by the rocker L to the holder H. The problem in which the magnet R rotates together to get out of the adjustment state is also frequent.

In view of such conventional problems, an object of the present invention is to provide a convergence device that can be fixed without applying an tangential external force without affecting the electron beam path.

1 is a schematic cross-sectional view showing the configuration of an inline color brown tube;

2 (A) to (C) are schematic diagrams showing the function of each pair of convergence devices;

3 (A) and (B) is a front view and a side view showing the structure of a conventional convergence device,

4 is a cross-sectional view showing the basic configuration of the present invention,

5 (A) to (C) are side views and cross-sectional views showing a first embodiment of the present invention,

6 (A) and (B) are a plan view and a cross-sectional view showing the configuration of the holder locker of FIG.

7 (A) to (C) are side views and cross-sectional views showing a second embodiment of the present invention,

8 (A) to (C) are side and cross sectional views showing a third embodiment of the present invention,

9 (A) to (B) are a plan view and a sectional view showing the structure of the holder locker of FIG.

<Description of the symbols for the main parts of the drawings>

N: neck

P: Adjustable magnet

1: holder 2: magnet mounting

3: holder coupling part

4,4 ': wedge tap

5: incision

7: holder locker

In order to achieve the above object, the convergence device according to the present invention has a holder thereof.

A cylindrical magnet mounting portion having a support portion into which a ring-shaped adjustment magnet is inserted, and a screw portion to which a rocker for fixing the adjustment state of the adjustment magnet is coupled at the rear end of the support portion;

It extends to the rear end of the magnet mounting part, extends in the form of a cantilever into a c-shaped incision at a plurality of positions on its outer circumference, and has a taper inwardly or outwardly in a radial direction, so as to radially engage the holder locker. And a holder engaging portion having a wedge tab clamped inwardly.

According to this configuration, even if the holder locker is made of synthetic resin having a lower strength than the metal, the holder can be fixed to prevent the influence on the electron beam path. Will not occur.

As a result, the present invention provides a convergence device that is easy to adjust the ITC.

Example

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

4 shows the main part of the CRT on which the convergence device of the present invention is mounted. The funnel portion of the CRT is provided with a deflection device DY, and the outer periphery of the neck N portion on which the electron gun is mounted. The convergence device of the present invention is installed.

The convergence device is basically a holder (1) mounted on the neck (N), a plurality of adjustment magnets (P; P2, P4, P6) rotatably supported thereto, and when the adjustment of each adjustment magnet (P) is completed Rocker (L) for fixing their adjustment state to the holder (1), and engaging means for coupling the holder (1) to the neck (N).

According to a feature of the present invention, the holder 1 is composed of a magnet mounting portion 2 on which the adjustment magnet P is installed, and a holder coupling portion 3 coupling the holder 1 to the neck N. The magnet mounting portion ( A plurality of adjusting magnets (P; P2, P4, P6) are inserted in the outer circumference of 2), and after adjusting the path of the electron beam by the relative rotation thereof, the rocker L is screwed to the screw portion 2a at the rear end of the adjustment. The adjustment state of the magnets P is fixed to the holder 1.

Meanwhile, the holder coupling portion 3 coupling the holder 1 to the neck N has a configuration of FIG.

First, the embodiment of Figure 5 (A) is an embodiment in which the holder coupling portion 3 has a screw coupling configuration, the thread portion (3a) is formed on the outer circumference of the holder coupling portion 3 and the c-shaped cut in a plurality of positions The portion 5 is formed so that the wedge tab 4 is formed in the cantilever, that is, in one side support state.

As a result, each wedge tab 4 is easily deformed toward the free end thereof, and the wedge tab 4 is formed with an inclined portion radially outward (Fig. 5B) or inward (Fig. 5C). Preferably, ribs 6 and 6 'protrude from the inside of the wedge tab 4 in order to increase the holding force on the neck N, so that the wedge tab 4 has an inclined portion outwardly. In the embodiment of (B), the rib 6 has a uniform height, but in the embodiment of FIG. 5C having an inclined portion therein, the height itself of the rib 6 'is changed to form an inclined portion (Fig. See enlarged view of 7 (B) and (C)).

5A and 5B show a preferred configuration of a holder rocker 7 suitable for use with the embodiment of FIG. 5 or FIG. 7, which is separate from the conventional rocker L. A threaded portion 7a to be coupled to a threaded portion 3a formed on the holder engaging portion 3 of the holder 1 is formed inside the body having a ring shape, and a plurality of parts for transmission of a rotary torque are formed on the outer circumference thereof. The arm 7b of is extended. Preferably, at the outer end of the arm 7b a lever 7c for bending torque mechanically for the automation of ITC work is extended.

On the other hand, in the embodiment of Fig. 7A, the holder 1 is fixed to the neck N at the same time as the holder 1 of the adjustment magnet P is fixed by the single rocker L or the holder locker 7 of Fig. 6. It can be fixed.

The difference in the configuration of Figs. 7B and 7C is the difference in the formation of the inclined portions as in the configuration of Figs. 5B and 5C, respectively, and the partial magnification is shown in Figs. It may be referred to in common with.

Meanwhile, the configuration of the holder 1 of FIG. 8 and the configuration of the holder locker 7 ′ of FIG. 9 have a locking coupling structure instead of the screw coupling of FIGS. 5 to 7.

In Fig. 8A, instead of the threaded portion 3a formed on the outer circumference of the holder engaging portion 3, each wedge tab 4 'is formed with a projection 4b projecting radially outward, and the upper portion thereof. The taper part 4a is formed in the.

On the other hand, the holder locker 7 'of FIGS. 9A to 9B has a tapered surface 7d corresponding to each protrusion 4b of the holder engaging portion 3 instead of the screw portion 7a. Formed.

Accordingly, when the holder locker 7 'is rotated while the holder locker 7' is positioned between the tapered portion 4a and the protrusion 4b of the holder 1, the protrusion 4b of the holder 1 is rotated. The holder 1 is fixed to the neck N by tightening the wedge tab 4 'to the neck N while moving relative to the tapered surface 7d of the holder rocker 7'.

At this time, since the inclined portion is formed on the outer side (FIG. 8B) or the inner side (FIG. 8C) of each wedge tab 4 ′, the ribs 6 and 6 ′ elastically deform and the holder 1 is connected to the neck N. FIG. Tightly fixed.

As described above, in the present invention, since the metal band is not used to fix the holder, the holder can be coupled without applying the tangential external force without affecting the adjustment state of the adjustment magnet, and thus there is no deviation of the adjustment state. As a result, the present invention provides a convergence device that can easily adjust the ITC and maintain the adjusted state.

Claims (6)

In the convergence device of the color CRT, wherein the plurality of adjusting magnets can be rotatably supported and fixed, and the holder is coupled to the neck of the CRT. A magnet mounting portion having a support portion into which the adjustment magnet is inserted, a screw portion to which a rocker for fixing the adjustment state is connected at a rear end of the support portion; A plurality of wedges extending at the rear end of the magnet mounting portion and extending in a cantilever shape into a c-shaped cutout at a plurality of positions on the outer circumference thereof and having an inclined portion radially inwardly or outwardly and being clamped radially inwardly when the holder locker is engaged; A convergence device of a color brown tube, characterized in that it comprises a holder engaging portion having a tab. The method of claim 1, A screw unit is formed on the outer circumference of the holder coupling portion and the wedge tab so that the holder locker is screwed to the screw portion. The method of claim 1, The protrusion protrudes radially outwardly to the wedge tab, and a tapered surface corresponding to the protrusion is formed in the holder locker. And a projection part moving along the tapered surface to tighten the wedge tab against the neck when the holder locker rotates. The method of claim 1, A rib of the color brown tube convergence device, characterized in that the rib is projected on the inside of each wedge tab. The method according to claim 1 or 4, The inclined portion of the wedge tab is formed of the convergence device of the color brown tube, characterized in that the height of the rib. The method of claim 1, The wedge tab is formed in the magnet mounting portion, And a neck coupling of the holder at the same time as the fixing magnet is fixed.