KR19990074508A - Mask structure of color CRT - Google Patents

Abstract

The present invention relates to a color CRT, and more particularly, to a mask of a CRT, which is capable of attenuating the shaking phenomenon due to external vibration by forming an uneven portion in the air gap of the grill-type shadow mask and the slot-type mask.

The present invention for this purpose, firstly, a panel coated with a phosphor on the inner surface, the grill mask is fixed to the inner surface of the panel and formed with a plurality of slots in the vertical direction, the grill and the grill mask while maintaining the panel at a predetermined interval A color CRT comprising a frame for fixing a mask to a panel; The uneven portion 13 is formed in the non-hole portion A of the grill mask 9 by vibration damping means.

Secondly, a color CRT comprising a panel coated with phosphor on an inner surface, a mask fixed to an inner surface of the panel and having a plurality of slots formed thereon, and a frame for maintaining the mask at a predetermined interval and fixing the mask to the panel; The uneven portion 16 is formed in the non-hole portion A of the mask 15 by vibration damping means.

Description

Mask structure of color CRT

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of color CRTs, and more particularly, to a mask structure of a color CRT that can attenuate the shaking phenomenon due to external vibration by forming an uneven portion in the non-perforations of the grill mask and the slot mask.

In general, as shown in FIG. 1, the color CRT forms an outer shape of a bulb form by integrating a panel 1 and a funnel 2 having a neck 3 at the rear, and forming a shape of a bulb form. 3) The electron gun (5) is embedded to emit the red, green, blue three-color electron beam (4), the outer surface of the neck portion 3 of the funnel (2) horizontal and the electron beam emitted from the electron gun A deflection yoke (not shown) is provided to deflect in the vertical direction, and a frame 6 is supported by a plurality of leaf springs 7 inside the panel 1, and the frame 6 The inner shield 8 is fixed to the funnel 2 side of the electron gun 5 to prevent the electron beam emitted from the electron gun 5 from being changed by the geomagnetic field or the leakage magnetic field, and the electron gun on the panel 1 side of the frame 6. New small holes formed so that the electron beam emitted in (5) can pass through A right mask 9 is fixed, and a screen is formed on the inner surface of the panel 1 to form an image when the electron beam 4 passing through the shadow mask 9 strikes, and the funnel 2 A graphite film (not shown) is successively applied to the inner side of the inner side and part of the inner side of the neck portion 3 so as to apply a high pressure to the electron gun 5.

Therefore, when power is applied to the cathode of the electron gun 5 and the electron beam 4 is generated, the generated electron beam is accelerated and focused while passing through the acceleration electrode and the focusing electrode in turn, and then is deflected by the deflection coil. About 20% of the light passes through the shadow mask 9 and the remaining about 80% of the electron beam is converted into thermal energy while impinging on the inner surface of the shadow mask 9.

The 20% electron beam 4 passing through the shadow mask 9 impinges on the screen applied to the inner surface of the panel 1 to emit phosphors, thereby reproducing an image.

On the other hand, the shadow mask 9 has a small hole (slot) is formed so that the electron beam 4 passes, the shape of the hole is circular, ellipse, rectangular, as shown in Figure 2a and 2b There is a hole formed long in the longitudinal direction.

The long hole is commonly referred to as a slit, and a shadow mask in which the slit is formed in a longitudinal direction is called a grill type mask.

While the grille mask 9 has an advantage of good brightness (brightness), when the installation force is applied only in the direction in which the slit 9a is formed, the grille mask 9 is vulnerable to external vibration, which causes a howling phenomenon. .

To compensate for this, as shown in FIG. 1, wire support pieces 11 are formed on the upper and lower left and right sides of the frame 6, and the damping wires 12 interconnecting the left and right support pieces 11 are grille-type masks 9. It was installed so as to be adsorbed on the front surface of the, and the shaking phenomenon of the grille mask 9 was prevented by the tensile force of the damping wire 12.

However, when the damping wire 12 installed to prevent the shaking of the grille mask 9 as described above is adsorbed on the front surface of the grille mask 9, the grille mask has a bulging curved surface forward. The configuration in which the damping wire 12 is pulled taut and at the same time the damping wire is attracted to the front surface of the grill mask 9 has technical limitations.

As a result, the curved surface of the grille mask 9 and the frame 6 fixing the grille mask 9 to completely absorb the damping wires 12 have to be composed of a multicurve surface (a shape in which the surfaces are continuously connected). There was this.

Nevertheless, since there was a portion where the front surface of the grill mask 9 and the damping wire 12 were not adsorbed, it was difficult to expect the anti-vibration effect.

The present invention has been made to solve the above conventional problems, the object is to improve the dust-proofing effect of the Basque.

The present invention for achieving the above object is first, a panel having a phosphor coated on the inner surface, a grill mask which is fixed to the inner surface of the panel and a plurality of slits are formed in the vertical direction, the panel and the grill mask is fixed A color CRT made of a frame or the like for maintaining a gap to fix a grill mask to a panel; It is to provide a mask structure of a color CRT tube, characterized in that to form an uneven portion by the vibration damping means in the non-pores of the grill mask.

Secondly, a color CRT comprising a panel coated with a phosphor on an inner surface, a mask fixed to an inner surface of the panel, and having a plurality of slots formed therein, and a frame for keeping the panel and the mask at a predetermined interval and fixing the mask to the panel. In; It is to provide a mask structure of a color CRT tube characterized by ehlaa by forming an uneven portion by the vibration damping means in the non-perforated portion of the mask.

1 is a side cross-sectional view showing an example of a general color CRT

Figure 2a is a front view showing a conventional grill mask

FIG. 2B is a cross-sectional view taken along line II of FIG. 2A

Figure 3 is a front view of the grill mask of the present invention is formed vibration damping means

4 is a cross-sectional view taken along the line II-II of FIG. 3.

5 is a front view of the slotted mask of the present invention in which vibration damping means are formed;

Explanation of symbols for main parts of the drawings

9: grill type mask 9a: slit

13, 16: uneven part A: no study

15: slotted mask 15a: slot

Hereinafter, the grill type mask and the slotted mask structure for dust protection will be described in detail with reference to FIGS. 3 to 4 as follows.

First, the grill mask 9 is made of a thin rectangular metal plate, and when viewed from the front, numerous slits 9a serving as color screening of the electron beam 4 emitted by the electron gun 5 are formed in the longitudinal direction. .

On the other hand, as shown in Fig. 4, the uneven portion 13 having a “V” shape is formed on the front surface of the non-porous portion A formed between the slit 9a and the slit 9a.

The uneven portion 13 serves to cancel the vibration phenomenon of the grille mask 9 by canceling the vibration transmitted from the outside in the axial direction of the grille mask 9.

Typically, when vibration is generated, a part of vibration is attenuated by the elastic force of the leaf spring while passing through the stud pin 14 (shown in FIG. 1) and the leaf spring 7 from the panel 1 or the funnel 2. And the remaining vibrations are transmitted to the grille mask 9.

Vibration is a kind of wave phenomenon. When a wave vibrating in various directions proceeds through a material, vibrations that coincide with the degree of freedom (the direction of motion of the molecules that make up the material) are absorbed by the material and do not correspond to the degree of freedom. Since the vibration does not penetrate the grille mask 9, the vibration characteristics are not significantly affected.

On the basis of this, the vibration is not transmitted to the uneven portion 13, and the vibration in the axial direction and the horizontal direction is transmitted to both sides of the uneven portion 13, so the vibration strength is inevitably weakened.

On the other hand, in the cross-sectional shape of the concave-convex portion 13, the left and right sides are formed to be inclined at an angle larger than 0 ° and smaller than 90 ° based on the vertical center line Y passing through the center of the concave-convex portion, wherein an inclination angle is about 45 degrees. It is preferable to set the inclination angle to 45 ° because the dispersion transmission effect of vibration is the greatest when having an angle.

In addition, while the above-described concave-convex portion 13 is formed on the entire surface of the grille mask 9, the concave-convex portions having the same shape may be formed on the rear surface of the grille mask 9.

In addition, in the mask 15 structure having the slot 15a-shaped electron beam through-hole formed on the inner surface of the mask as well as the grille mask 9, the present invention is applied to the non-holes A on the slotted mask surface. Even if the uneven portion 16 is formed, the same effect of attenuating the vacuum characteristic can be obtained, of course.

By applying the mask of the present invention as described above it is possible to attenuate the vibration phenomenon by transmitting the external vibration transmitted to the mask as well as the structural strength of the mask itself has the effect of strengthening.

Claims (3)

A panel having a phosphor coated on the inner surface, a grill mask fixed to an inner surface of the panel and having a plurality of slots formed in a vertical direction, and holding the panel and the grill mask at regular intervals and fixing the grill mask to the panel In a color CRT made of a frame or the like; The mask structure of a color CRT tube, characterized in that to form an uneven portion by the vibration damping means in the non-pores of the grill mask. The method of claim 1, A mask structure of a color CRT tube, characterized in that the cross-sectional shape of the uneven portion becomes a “V” shape that gradually narrows from the front side to the rear side of the grille mask. A color CRT comprising a panel coated with phosphor on an inner surface, a mask fixed to an inner surface of the panel and having a plurality of slots formed therein, and a frame for holding the panel and the mask at a predetermined interval and fixing the mask to the panel; The mask structure of the color CRT tube, characterized in that to form an uneven portion by vibration damping means in the non-perforated portion of the mask.