KR100322679B1 - Shadow mask type color picture tube - Google Patents

Abstract

PURPOSE: A shadow mask type color picture tube is provided to minimize the migration of an electron beam due to a doming phenomenon of a shadow mask by using a trimetal spring and a bimetal spring. CONSTITUTION: A shadow mask assembly as a combination body of a shadow mask and a frame(12) is mounted on the inside of a panel(14). An electron gun is combined with a neck portion. A deflection portion is installed at a yoke portion of a funnel. A trimetal spring and a bimetal spring are used for supporting the shadow mask assembly. The trimetal spring and the bimetal spring are formed by a material of a high thermal expansion coefficient and a material of a low thermal expansion coefficient. The trimetal spring is parallel to a long side of the frame(12). The bimetal spring is welded on a bottom face of the frame(12).

Description

Shadow mask type color water pipe

The present invention relates to a shadow mask type color receiver, and in particular, to minimize the movement of the electron beam due to the doming phenomenon of the shadow mask.

A conventional color water pipe includes a panel 4 having a shadow mask frame assembly 3 mounted therein, in which a shadow mask 1 is coupled to a frame 2, as shown in FIG. An electron gun 6 was provided in the neck portion 5 of the funnel 7 enclosed in the.

The color water pipe constructed as described above forms one pixel because the electron beam 8 emitted from the electron gun 6 does not pass all of the electron beam passing holes of the shadow mask 1 but only partially passes through and lands on the fluorescent film 9. .

At this time, the electron beam that does not pass through the electron beam through-holes causes a dominant phenomenon in which the shadow mask 1 is swollen by hot electrons.

As described above, the dominant phenomenon generated in the shadow mask 1 changes the position of the electron beam 8 landing on the fluorescent film 9, thereby lowering the color purity.

In addition, the landing trajectory when the light is emitted from the electron gun 6 and landed passes through the electron beam formed in the shadow mask 1 as (a) of the shadow mask 1 is first heated as shown in (b) of FIG. 2. As the ball moves toward the center of the screen (b) and the cha-cha frame (2) is thermally expanded, the ball moves to the outside of the screen as shown in (c) of the shadow mask (1).

Such a movement of the landing trajectory is carried out by the trimetal spring 10 which positions the shadow mask frame assembly 3 inside the panel as shown in FIG. 1 and the shadow mask frame assembly 3 is moved to the inner surface of the panel 4. By raising to the side, the electron beam trajectory d is corrected to coincide with the original position (a).

In this way, it takes about 3 minutes until the shadow mask expands as the (b) shadow mask expands and the electron beam reaches the center of the screen, and the electron beam moves about 25 inches and 29 inches of AK mask. In the case of about 80㎛.

Then, when the frame 2 expands and the electron beam starts to move out of the screen, the trimetal spring moves the shadow mask frame assembly 3 to the inner surface side of the panel to prevent movement of the electron beam, thereby preventing color degradation. There was a problem in that the desired image could not be accurately reproduced for about three minutes by operating the water tube.

The present invention has been made in view of the above, the initial operation of the color water pipe is provided with a structure using a trimetal spring and bimetal spring at the same time to move the shadow mask frame assembly downward and then to move the shadow mask frame assembly toward the fluorescent surface By doing so, the purpose of the present invention is to minimize the color purity degradation caused by the initial doming that occurs after operating the color receiver.

The configuration of the shadow mask type color water pipe of the present invention will be described with reference to FIG.

The panel 14 in which the shadow mask frame assembly is coupled to the frame 12 and the shadow mask 11 is mounted therein, and the funnel 17 in which the electron gun 16 is sealed in the neck portion 15 are sealed. In the case where the deflection portion 18 is attached to the yoke portion of the funnel,

Supporting the shadowmask frame assembly consisted of a trimetal spring 19 and a bimetal spring 20 as in FIG.

The trimetal springs 19 and the bimetal springs 20 have different thermal expansion coefficients, that is, materials having a high coefficient of thermal expansion and a material having a low coefficient of thermal expansion are formed in the form of parallel and contact.

As described above, the trimetal springs 19 configured to be parallel are welded horizontally to the long sides and short sides of the frame 12, and the bimetal springs 20 constituted by the plate contact are the long sides and the frames 12 of the frame 12. Vertically connected to the long side and the short side of the welded to the base 21 of the frame 12.

The trimetal spring 19 is bonded to a material having a high coefficient of thermal expansion at the bottom of the lower portion, and the bimetal spring 20 is made of a material having a high coefficient of thermal expansion at a portion in contact with the frame, and a lower surface thereof has a low coefficient of thermal expansion. It is bonded with a material having.

In the color receiver according to the present invention configured as described above, the amount of electron beam movement in the fluorescent surface when the mask is inflated and moved from (a) to (b) as shown in FIG. 2 is peaked as shown in the graph of FIG. Since the value (A) is connected to the frame 12 perpendicular to the welded bimetal spring to the lower end of the frame to move the frame downwards to correct the amount of shadow mask domming.

Therefore, the displacement amount to be corrected by the bimetal spring should be a value (A).

However, after 3 to 5 minutes, heat is transferred to the frame so that when the shadow mask moves from (b) to (c) as in the second diagram, the trimetal spring raises the frame in the direction of the panel of the water pipe to As the frame is stretched, the amount of change in the fluorescent surface of the electron beam is corrected.

At this time, since the bimetal spring is operated in the downward direction, the amount of correction to be corrected by the trimetal spring should be equal to the sum (2A-B) of the amount (A) in which the frame is extended and the amount (A) in which the bimetal spring is extended downward.

In addition, during the initial operation of the color water pipe (2-3 minutes), a large amount of current flows through the vertical and horizontal coils of the deflection portion of FIG. 3 to sufficiently overscan, thereby the electron beam is applied to the lower end of the bimetal spring. You must have a conflict.

After 2-3 minutes, the current in the normal driving state should be flowed into the vertical and horizontal coils so that electrons do not collide with the lower end of the frame.

As described above, the trimetal spring and the bimetal spring are sequentially operated so that the mask does not change from (a) to (b) (C), thus preventing the color purity from deteriorating.

1 is a partial cutaway cross-sectional view showing the interior parts of a conventional color water pipe.

2 is a cross-sectional view showing a moving step of the mask by thermal expansion of the conventional color water pipe.

Figure 3 is a partially cutaway cross-sectional view showing the interior parts of the color water pipe of the present invention.

4 is a detailed view of the color receiver of the present invention.

5 is an embodiment of the present invention.

*** Explanation of symbols on main parts of drawing ***

11: shadow mask 12: frame

15 neck portion 16 electron gun

18: deflection portion 19: trimetal spring

20: bimetal spring 21: bottom of the frame

Claims (2)

In a color water pipe, a panel in which a shadow mask frame assembly in which a shadow mask is coupled to a frame is mounted, and a funnel in which an electron gun is enclosed in a neck is sealed. The shadow mask type collar is characterized by having a trimetal spring and a bimetal spring to initially move the shadow mask frame assembly downward while supporting the shadow mask frame assembly and then to move the shadow mask frame assembly toward the fluorescent surface of the panel. Winners. The method of claim 1, The trimetal spring is parallel to the long side of the frame, the bimetal spring is welded to the bottom of the frame, and the material of high thermal expansion coefficient is located on the top, and the material of low expansion coefficient is located on the bottom. Masked color water pipe.