KR20050002539A - Flat Type of Color Cathode-ray Tube - Google Patents

Abstract

PURPOSE: A flat cathode ray tube is provided to reduce manufacturing costs by reducing thicknesses of a panel and a funnel, and achieve improved explosion proof characteristics by forming a groove at an upper surface of the funnel so as to enhance sealing of the panel and the funnel. CONSTITUTION: A flat cathode ray tube comprises a panel(1) having an inner surface on which a screen is formed; a funnel(3) mounted on a rear surface of the panel; an electron gun inserted into a neck portion of the funnel so as to emit electron beams toward the screen; and a tension mask having a plurality of electron beam passing holes. The panel has a diagonal effective surface length to panel thickness ratio of 2.7 to 3.3%. The funnel has a diagonal effective surface length to seal edge thickness ratio of 1.8 to 2.0%.

Description

Flat CRT Tube {Flat Type of Color Cathode-ray Tube}

The present invention relates to a planar CRT, and more particularly, to control the thickness of the most expensive panel and funnel in the CRT component to reduce the manufacturing cost and at the same time to form a constant groove on the upper surface of the funnel to affect the explosion-proof characteristics The present invention relates to a planar CRT which can improve tear stress, vacuum stress, and adhesive strength of panels and funnels.

In general, the planar CRT is a plate-shaped panel (1) as shown in Figure 1, the explosion-proof glass (2) is fixed to the front of the panel (1) to improve the explosion-proof characteristics, and the panel (1) as frit glass A fusion-fixed, funnel 3 formed in a smooth curve from the seal surface fused to the panel 1 to the neck portion 3a in which the electron gun is enclosed, and encapsulated in the neck portion of the funnel 3, are rusted and rusted. And an electron gun 4 which emits blue (R, G, B) three-color electron beams toward the panel 1 side.

And a fluorescent film 5 applied to the inner surface of the panel 1 to emit light as the electron beam strikes, a rail 6 having a rectangular frame shape fixed to the inner surface of the panel 1, and a state in which the rail is tensioned. The shadow mask (7) is fixed to the effective surface and numerous holes in the shape of pores are used to screen the color of the electron beam, and the electron beam fixed to the rail and scanned from the electron gun to the panel (1) moves the electron beam from the geomagnetic field. And an inner shield 8 for protection and a deflection yoke 9 provided on the outer circumferential surface of the neck portion for deflecting the electron beam in the horizontal and vertical directions.

In addition, a band 11 for fixing the plurality of lugs 10 is fastened to the outer circumferential surface of the panel 1 to fix the flat CRT configured as described above to the chassis of the monitor or TV.

Therefore, when power is applied to the cathode of the electron gun 4 enclosed in the neck portion 3a to radiate hot electrons, the radiated hot electrons are accelerated and focused while passing through a plurality of electrodes in turn, and then horizontally and by the deflection yoke 9. Scanning is carried out to the screen side while being deflected in the vertical direction.

As such, when the electron beam emitted from the electron gun 4 is scanned to the screen side, the electron beam passes through the fine holes of the shadow mask 7 and is subjected to color screening, and then hits the phosphor forming the fluorescent film 5.

As a result, the electrons in the phosphor are excited and emit light due to the energy difference generated as they fall to the ground state, thereby reproducing the screen.

Nowadays, the widening of the gap is almost limited in the display tubes such as the difference in the visible technologies such as the clarity and the image quality, so that most of them can reduce the cost of components in the manufacture of the CRT and at the same time, the general CRT. The focus is on realizing CRTs of similar quality.

According to the technical trend of cathode ray tube, it is necessary to reduce raw material cost by reducing the thickness of panel and funnel, which is the most expensive part of CRT parts, and at the same time, it is necessary to have a structure that can optimize the explosion-proof characteristics, which is the quality characteristic of CRT.

Figure 2 shows the actual shape of the funnel attached to the conventional panel.

As shown in FIG. 2, the panel is conventionally coupled to the funnel with frit glass 20, and the upper seal surface of the funnel is formed in a planar shape.

The upper flat surface of the flat funnel as described above weakens the adhesive force between the panel and the funnel, and thus adversely affects the explosion-proof characteristics of the quality of the CRT or the allowable stress.

Therefore, in order to increase the adhesive force, the upper thickness of the funnel (SET: Seal Edge) to be attached to the panel must be widened, which in turn increases the manufacturing cost of the CRT.

The present invention is to solve such a problem in the prior art, the thickness of the panel and funnel within the permissible range of stress to reduce the manufacturing cost and at the same time to improve the adhesive strength of the panel and funnel funnel bonded to the panel It is an object of the present invention to provide a flat CRT tube that can maximize explosion-proof characteristics, which is one of the CRT quality, by forming a certain groove on the upper surface.

1 is a view showing a conventional planar CRT.

Figure 2 is a view showing the actual shape of the funnel attached to the conventional panel.

Figure 3 is a comparison of the thermal stress of the funnel according to the thickness of the upper panel of the conventional panel thickness and the funnel and the upper seal surface of the funnel panel of the present invention.

Figure 4 is a comparison of the thermal stress of the panel according to the conventional panel thickness and the upper surface thickness of the funnel and the panel thickness of the present invention and the upper surface surface of the funnel.

5 is a view showing the shape of the upper surface of the funnel according to the invention.

Figure 6 is a view showing the results when the explosion-proof test of the planar CRT of the present invention.

***** Explanation of symbols for the main parts of the drawing *****

1: panel 2: explosion-proof glass

3: funnel 4: electron gun

5: fluorescent film 6: rail

7: Shadow Mask 8: Inner Shield

9: deflection yoke 10: rug

11: band

Technical means of the present invention for achieving the above object is a panel having a screen on the inner surface, a funnel mounted to the rear of the panel, an electron gun inserted into the neck portion of the funnel to emit an electron beam toward the screen, the panel inner surface In a planar CRT comprising a tension mask having a plurality of electron beam through holes arranged at regular intervals, the panel has a ratio of 2.7% to 3.3% of the panel thickness to the diagonal effective screen length (USD) of the panel. The funnel is characterized in that the ratio of the upper edge of the funnel (Seal Edge Thickness) to the diagonal length of the funnel satisfies a value of 1.8% to 2.0%.

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

FIG. 3 compares a conventional panel thickness with a top edge thickness of a funnel and a thermal stress of a funnel according to a panel thickness of the present invention and a top edge thickness of a funnel.

FIG. 4 compares the conventional panel thickness with the upper edge thickness of the funnel and the thermal stress of the panel according to the panel thickness and the upper edge thickness of the funnel. .

As shown in FIG. 3 and FIG. 4, it can be seen that the thermal stress decreases as the thickness of the panel or the funnel becomes smaller.

Therefore, the panel according to the present invention is to set the ratio of the panel thickness to the panel diagonal length in the range of 3% to 2.0% to 2.6% as shown in the following Table 1, the funnel is the top of the funnel to the funnel diagonal length It is preferable to set the ratio of the thickness (SET: Seal Edge Thickness) to be lowered from 2.2% to 1.8% to 2.0%.

In addition, when setting the ratio of the panel thickness on the basis of USD which is the diagonally effective screen size of the panel, it is preferable to satisfy the range of 2.7% to 3.3%.

division Conventional panel thickness: 16.0 mm The present invention (panel thickness: 14.0mm) Panel thickness / panel diagonal length 3% 2.0% to 2.6% Funnel Upper Thickness / Funnel Diagonal Length 2.2% 1.8% to 2.0%

At this time, the explosion-proof characteristics due to the increase in the vacuum stress generated when the thickness of the panel and the funnel is reduced is improved by forming a recessed groove having a predetermined shape on the upper surface of the funnel.

The following Table 2 compares the adhesive force of the panel and the funnel according to the conventional funnel upper flat surface shape and the funnel upper surface shape of the present invention.

division Funnel upper face shape Adhesive force between panel and funnel Species Planar 97kgf / ㎠ The present invention Round depression 150kgf / ㎠

As shown in Table 2, it can be seen that when the upper face of the funnel has a recessed shape having a predetermined groove rather than a flat face, the adhesive force between the panel and the funnel is increased.

Preferably, the shape of the groove recessed in the upper surface of the funnel is to be made in a round, V-shaped, c-shaped as shown in FIG.

More preferably, the depth of the recessed groove is formed to be 5 mm or less.

This is because when the depth of the recessed groove of the upper surface of the funnel becomes 5 mm or more, more than necessary frit glass is wasted, and the stress may be worsened.

In addition, the shape of the frit glass applied to the upper surface of the funnel and the shape of the frit glass after passing through the frit sealing furnace that melts the frit glass and attaches the panel and the funnel are neat and show optimal characteristics. to be.

Figure 6 shows the results of the explosion-proof test of the planar CRT of the present invention having the structure as described above.

As shown in FIG. 6, the flat CRT according to the present invention has only a ball (Ball, 30) impact trace during explosion proof test, and no crack is generated in the panel.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the thickness of the panel and the funnel is appropriately reduced within the allowable range of stress, thereby reducing the manufacturing cost and simultaneously forming a predetermined groove in the upper surface of the funnel bonded to the panel to improve the adhesive strength of the panel and the funnel. By doing so, there is an effect that can maximize the explosion-proof characteristics, which is one of the quality of the CRT.

Claims (6)

A panel having a screen on an inner surface, a funnel mounted on a rear surface of the panel, an electron gun inserted into a neck portion of the funnel to emit an electron beam toward a screen, and a plurality of electron beam passing holes disposed at regular intervals on the inner surface of the panel. In the planar CRT tube having a tension mask, The panel has a value of 2.7% to 3.3% of the panel thickness to the diagonal effective screen length (USD) of the panel, and the funnel has a ratio of 1.8% to 2.0% of the upper edge thickness of the funnel to the diagonal length of the funnel. Flat CRT, characterized in that the value of satisfy. The method of claim 1, The panel has a ratio of 2.0% to 2.6% of the panel thickness to the diagonal length of the panel, and the funnel satisfies the ratio of 1.8% to 2.0% of the upper edge thickness of the funnel to the diagonal length of the funnel. Flat cathode ray tube, characterized in that. The method according to claim 1 or 2, Flat CRT tube, characterized in that the recess is provided in the upper surface of the funnel bonded to the panel. The method according to claim 1 or 2, The planar CRT tube, characterized in that the shape of the groove recessed in the upper surface of the funnel is made of round, V-shaped, U-shaped. The method according to claim 1 or 2, Flat groove tube, characterized in that the depth of the groove recessed in the upper surface of the funnel is formed 5mm or less. The method according to claim 1 or 2, The panel is a planar CRT, characterized in that the inner and outer surfaces are substantially flat.