KR20010113276A - CRT have increased shock intensity - Google Patents

Abstract

PURPOSE: To provide a cathode ray tube which can increase the impact strength during drop test by adhering the shadow mask and the face panel to each other at a predetermined position.

A cathode ray tube that implements a screen by hitting a face panel coated with a phosphor by passing an electron beam of an electron gun through a shadow mask, the spacer including a spacer installed on an opposite surface of the shadow mask and the face panel, wherein the spacer includes a shadow mask and a shadow mask; It consists of a configuration in which the face panels are adhesively connected.

EFFECT: The shadow mask and the face of the face panel support a constant distance to prevent the shadow mask from deforming during drop test of the cathode ray tube, and the impact strength is increased to improve reliability.

Description

Cathode ray tube with improved impact strength {CRT have increased shock intensity}

The present invention relates to a cathode ray tube, and more particularly, to a cathode ray tube having improved strength of a face panel and a shadow mask.

Cathode ray tubes are widely used as the most common type of display used in televisions, monitors, and the like to implement screens. A schematic side cross-sectional structure of the cathode ray tube is shown in FIG. 4.

Referring to the drawings, the cathode ray tube is roughly divided into an electron gun 2, a deflection yoke 4, an inner shield 6, a shadow mask 8, a face panel 10, and a funnel 12. The electron gun (2) is a device that emits an electron beam by heating the cathode, the number of electrodes are excessive until the electron beam is emitted toward the face panel 10, the electrodes form an electric field like a lens by the voltage difference to form an electron beam To accelerate and focus.

Since the electron beam has straightness, the deflection yoke 4 is mounted as a means for deflecting the electron beam in order to scan at a desired screen width. The deflection yoke 4 forms a magnetic field to adjust the deflection angle of the electron beam. The electron beam can also be affected by geomagnetism, which reduces the influence of geomagnetism by mounting the inner shield 6 as shown.

The inner shield 6 is bonded to the shadow mask 8, which is usually made of INVAR steel as a thin plate of 0.5 mm or less in thickness. Although the mask and the face panel are planarized, as shown in the drawing, the shadow mask 8 or the face panel 10 having a predetermined curvature is also continuously produced and developed.

The shadow mask 8 is provided with a plurality of stripe or dot mask holes 8a. The mask hole 8a is a through hole through which the electron beam of the electron gun 2 passes, and has a color discrimination function so that the electron beam can selectively reach the face panel 10 coated with the phosphor 11. The face panel 10 is positioned at a predetermined distance from the shadow mask 8. The face panel 10 has a phosphor 11 coated on an opposite surface of the mask to emit an electron beam emitted from the electron gun 2. 11) will shine while hitting.

The other devices except for the deflection yoke 4 are embedded in the funnel-shaped funnel 12, and the face panel 10 and the funnel 12 are fixed by sealing and banding. The shadow mask 8 is welded to the frame 82 and installed inside the face panel 10. At this time, a stud pin 10b formed at an inner side of the face panel 10 is formed on a side of the mask frame assembly. 82a) to install.

The cathode ray tube completed by the above process is subjected to various tests before being assembled into a cabinet and released into a product. One of these tests is a drop test for testing impact strength. In the drop test, a jig is attached to the ear of the cathode ray tube and the cathode ray tube equipped with the jig is dropped, and the cathode ray tube of the above-described type has a shadow mask and a face panel when the drop is directed toward the bottom of the electron gun installation unit. It is more fragile in impact strength than the pipe, so plastic deformation occurs, resulting in a problem of poor display.

The present invention is a new invention proposed to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a cathode ray tube that can increase the impact strength during the drop test by adhering the shadow mask and the face panel to each other at a predetermined position.

In order to achieve the above object, a cathode ray tube having an improved impact strength according to the present invention is a cathode ray tube which implements a screen by hitting a face panel coated with a phosphor by passing an electron beam of an electron gun through a shadow mask, wherein the shadow mask and face panel It includes a spacer provided on the opposite side of the spacer is made of a configuration in which the shadow mask and the face panel adhesively connected.

Preferably, the spacer adopts the same material as that of the face panel.

As described above, when the shadow mask and the face panel are partially adhered to each other, when the shadow mask and the face panel are impacted, the impact of the shadow mask and the face panel against each other may be reduced, thereby reducing deformation and improving impact strength. .

Figure 1 is a side cross-sectional view showing an embodiment of the cathode ray tube improved impact strength by the present invention.

FIG. 2 is a front view in the A direction of the face panel shown in FIG. 1; FIG.

3 is an enlarged view of the face panel and the shadow mask shown in FIG.

Figure 4 is a side cross-sectional view showing a conventional cathode ray tube.

** Explanation of symbols for main parts of drawings **

2: electron gun 4: deflection yoke

6: inner shield 8,8 ': shadow mask

10,10 ': face panel 11: phosphor

12: funnel 18: spacer

18a: adhesive

The structure of this invention is demonstrated in detail, referring an accompanying drawing. For reference, in order to avoid duplication of description, the same reference numerals as those in the prior art will be referred to.

Figure 1 is a side cross-sectional view showing a preferred embodiment of the cathode ray tube improved impact strength according to the present invention.

Referring to the drawings, the cathode ray tube according to the present invention corrects an electron gun 2 for emitting an electron beam, a deflection yoke 4 for deflecting an electron beam emitted from the electron gun 2, and an influence of geomagnetism on the electron beam. A shadow mask (8 ') having an inner shield (6), a mask hole (8'a) for screening the electron beam selectively to hit the phosphor of the face panel, and a face panel for implementing a color screen ( 10 '), the electron gun 2, the inner shield 6, the shadow mask (8') and the like, including a funnel (12) forming a high pressure vacuum.

The shadow mask 8 'is welded to the mask frame 82 and then the mask frame assembly is coupled by a stud pin 10'b and a spring 82a inside the face panel 10' and the face panel. The 10 'and the funnel 12 are sealed and bent, and the deflection yoke 4 is mounted on the neck portion of the funnel 12. Since the configuration of the cathode ray tube is described in the prior art, a detailed description thereof will be omitted.

In the shadow mask 8 'and the face panel 10' according to the present invention, spacers 18 are formed at predetermined portions including a central portion on opposite surfaces facing each other. The positions of the spacers 18 can be symmetrical at equal intervals so as to take a structurally stable form.

2 and 3 show an A-direction front view and an enlarged view of the shadow mask 8 'and the face panel 10' shown in FIG. 1, respectively.

As shown in FIG. 2, the shadow mask 8 ′ and the face panel 10 ′ have spacers 18 formed at various positions including the center portion. Referring to FIG. 3, the face mask 10 ′ and the shadow mask are formed. The 8 'are separated from each other by a predetermined interval except for the spacer 18. The spacer 18 is attached using the adhesive 18a. The adhesive 18a has the same or similar properties as the material constituting the face panel 10 'and the face panel 10 when the phosphor 11 emits light. Use materials with less heterogeneity to achieve the same color purity as').

When the adhesive is bonded as described above, since the phosphor 11 may not be applied where the spacer 18 is formed in the face panel 10 ', the phosphor at the end of the adhesive 18a adhered to the shadow mask 8' side as shown in the drawing. (11) is coated. When the phosphor 11 is coated, since the shadow mask 8 'and the face panel 10' are already bonded, the adhesive 18a adhered between the mask holes 8'a of the shadow mask 8 ' The fluorescent substance 11 is apply | coated. Therefore, the electron beam reaches the phosphor 11 directly without passing through the shadow mask 8 '.

In the exemplary embodiment shown in the drawing, five spacers 18 are provided, but the number of the spacers 18 is not limited, and the spacers 18 may be formed according to the size of the face panel 10 'and the shadow mask 8'. The number of spacers 18 may be appropriately adjusted if the screen reliability decreases when forming too many spacers 18, but the overall symmetry is required.

As described above, when the shadow mask (8 ') and the face panel (10') having a predetermined curvature are dropped at a predetermined position by dropping the cathode ray tube attached to n places, the impact gun is dropped downward when the impact strength is tested. In the impact strength test, the impact amount of the shadow mask and the facing surface of the face panel can be reduced.

The opposing surface of the shadow mask and the face panel serves to maintain a constant distance to prevent the shadow mask from deforming during the drop test of the cathode ray tube, and the impact strength is increased to improve reliability.

Claims (4)

In the cathode ray tube that the electron beam of the electron gun passes through the shadow mask to strike the face panel coated with the phosphor, to implement the screen, Cathode ray tube improved impact strength, characterized in that it comprises a spacer provided between the shadow mask and the face panel. The cathode ray tube of claim 1, wherein the spacer is adhesively connected to the shadow mask and the face panel. The cathode ray tube according to claim 1, wherein the spacer and the face panel are made of the same material. The cathode ray tube of claim 1, wherein a phosphor is coated at an end portion of the shadow mask side of the spacer.