KR100730109B1 - Flat type color picture tube - Google Patents

Abstract

According to the present invention, a flat color cathode ray tube includes a panel having a fluorescent film formed on an inner surface thereof; It is installed on the inner surface of the panel and has a tension mask, a support portion for supporting both sides of the tension mask, and an electron beam reflecting surface that extends inward from the support portion and reflects the electron beam to the opposite side of the fluorescent film when the electron beam is incident. A tension mask frame assembly comprising a support member having a flange portion and a frame made of an elastic member supporting the support member; A funnel sealed to the panel; An electron gun mounted to the neck portion of the funnel; It is mounted on the outer peripheral surface of the neck portion includes a deflection yoke for deflecting the electron beam emitted from the electron gun.

Description

Flat color cathode ray tube {Flat type color picture tube}

1 is a partial ablation perspective view of a typical cathode ray tube,

Figure 2 is a perspective view of a conventional tension mask frame assembly,

FIG. 3 is a perspective view illustrating a state in which an electron beam collides with and reflects a flange portion of the support member illustrated in FIG. 2;

4 is a perspective view of a tension mask frame assembly according to the present invention;

FIG. 5 is a partially cutaway perspective view illustrating a state in which an electron beam is landing and reflected on a reflective surface of the support member illustrated in FIG. 4;

6 is a perspective view showing another embodiment of the frame according to the present invention.

The present invention relates to a planar cathode ray tube, and more particularly, to a planar cathode ray tube configured to prevent a part of an electron beam emitted from an electron gun from colliding with a frame and causing diffuse reflection into a fluorescent film.

The color cathode ray tube excites these electron beams emitted from the electron gun by landing on the red, green, and blue phosphors of the fluorescent film formed on the screen surface of the panel through the electron beam through holes of a mask having a color screening function. An image is formed.

Recently, such a color cathode ray tube pursues flattening of the screen surface, and accordingly, a mask having a color discrimination function must be flattened inside the cathode ray tube. By the way, such a mask has become one of many constraints in producing a full-planar cathode ray tube.

1 shows an example of such a cathode ray tube.

As shown in the drawing, a panel 12 having a smooth screen surface, a tension mask frame assembly which is installed inside the panel, and is combined with a tension mask 30 and a frame 20, and the panel 12 and A funnel 14 to be coupled, a deflection yoke 15 and an electron gun 16 which are respectively installed at the cone portion and the neck portion 14a of the funnel 14 are provided.

An example of a frame 20 supporting the tension mask is shown in FIG. 2.

As shown, the first and second support members 21 are provided in parallel with each other and have support portions 21a and 22a for supporting the tension mask 30 and flange portions 21b and 22b extending inwardly from the support portions. 22 and the first and second elastic members 23 (both ends, respectively) fixed to both sides of the first and second support members 21 and 22 to maintain a gap between the support members 21 and 22 ( 24).

In the flat color cathode ray tube constructed as described above, the electron beam emitted from the electron gun is deflected by the deflection yoke, passes through the slot of the tension mark (not shown), and then lands on the fluorescent film to excite the phosphor to form an image. do. As described above, the electron beam deflected by the deflection yoke 15 does not pass through the slot of the tension mask and passes only a portion (10 to 25%) in the process of forming the image. Therefore, the electron beam that has not passed is extinguished or diffused by heat. In particular, in order to widen the effective screen formed by the excitation of the phosphor, as shown in FIG. 3, the end portions of the flange portions 21b and 22b of the first and second support members 21 and 22 affect the traveling direction of the electron beam. The inclined surfaces 21c and 22c are formed on the inner side so as not to have any effect. However, when the electron beam emitted from the electron gun collides with the flange portions 21b and 22b of the first and second support members 21 and 22, the electron beam is diffusely reflected to pass through the slots of the tension mask to provide the phosphor of the fluorescent film. Since it is excited, there is a problem of emitting unwanted phosphors.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a flat cathode ray tube having a frame capable of preventing unwanted phosphors from emitting light when the electron beam emitted from the electron gun collides with the support members and is diffusely reflected. .

In order to achieve the above object, the present invention provides a flat color cathode ray tube comprising: a panel having a fluorescent film formed on an inner surface thereof; A tension mask frame assembly having a frame including a tension mask installed at an inner side of the panel, a support member supporting the tension mask, and an elastic member supporting the support member; A funnel sealed to the panel; An electron gun mounted to the neck portion of the funnel; And a deflection yoke mounted on an outer circumferential surface of the neck portion to deflect the electron beam emitted from the electron gun, wherein the support member of the frame includes a support portion for supporting the tension mask and a flange portion extending inwardly from the support portion; And the flange portion has an electron beam reflecting surface for reflecting an electron beam colliding with the flange portion out of the electron beam incident toward the fluorescent film.

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

As shown in FIG. 1, the planar cathode ray tube includes a panel 12 having a fluorescent film formed in a predetermined pattern on an inner surface thereof, and a tension mask frame assembly formed on an inner surface of the panel 12 so that an electron beam can be accurately landed on the fluorescent film. 40). The panel 12 is sealed with a cone-shaped funnel 14, and the neck portion 14a of the funnel has an electron gun 16 for emitting an electron beam for exciting the fluorescent film, and for deflecting the electron beam emitted from the electron gun. Deflection yoke 15 is included.

As shown in FIGS. 4 and 5, the tension mask frame assembly 40 mounted on the inner surface of the panel 12 includes a tension mask 41 having a color discrimination function of an electron beam, and a tension mask 41. It includes a frame 42 for supporting so that the tensile force of the applied.

The tension mask 41 has a plurality of strips 41a and 41a spaced apart from each other at predetermined intervals on the thin plate, and the adjacent strips 41a and 41a have a predetermined horizontal pitch. A plurality of slots 41c are formed in connection with each other. In the slot 41c defined by the real bridge 41b as described above, dummy bridges (not shown) extending from at least one strip 41a and 41a may be formed.

The frame 42 supporting the tension mask 41 includes first and second support members 43 and 44 for supporting a long side of the tension mask 41, and the first and second support members 42 ( 43 and first and second elastic members 45 and 46 having elastic force. The first and second support members 43 and 44 are provided with support parts 43a and 44a welded to the long sides of the tension mask 41 and flange parts 43b extending inwardly from the support parts 43a and 44a. ) 44b. Herein, an electron beam emitted from the electron gun and impinged on the ends of the flange parts 43b and 44b at the ends of the flange parts 43b and 44b is landed in the fluorescent film through the slot 41 of the tension mask 41. An electron beam reflecting surface 50 which is diffusely reflected so as not to be formed is formed. The electron beam reflecting surface 50 is formed to be inclined from the rear surface of the flange portions 42b and 43b to the inner edge of the flange portion, and the electron beam reflecting surface 50 is in the longitudinal direction of the ends of the flange portions 43b and 44b. Is formed.

Here, in the inner end surface of the flange portion where the electron beam reflection surface 50 is formed, as shown in FIG. 6, the path of the electron beam is interfered by the end portions of the flange portions 43b and 44b to prevent the effective screen from decreasing. An inner inclined surface 60 may be formed.

Referring to the operation of the planar color cathode ray tube according to the present invention configured as described above are as follows.

In the planar color cathode ray tube, three electron beams emitted from the in-line electron gun 34 are deflected by the deflection yoke 15 to pass through the slot 41c of the tension mask 41 and land on the fluorescent film to form an image. Done. In this process, the electron beam scattered in the process of scanning the electron beam emitted from the electron gun 16 to the edge of the fluorescent film, that is, the edge of the effective screen, is landed at the ends of the flange parts 43b and 44b. The electron beam reflecting surface 50 inclined with respect to the electron beam propagation direction is formed at the ends of 43b) and 44b, so that the electron beam impinged on the end of the flange portion is not diffusely reflected to the tension mask 41 side, that is, the fluorescent film side, and the electron gun. It is diffusely reflected to (16) side. Therefore, it is possible to prevent the fluorescent film from erroneously emitting by the electron beam collided with and reflected at the end of the flange portion.

In particular, since the inclined surface is formed at the inner end of the flange portions 43b and 44b to reduce the interference of the electron beam scanned to the edge of the effective screen, the effective screen can be widened.

The planar color cathode ray tube according to the present invention configured as described above forms an electron beam reflecting surface at the end of the flange portion, thereby preventing the electron beam emitted from the electron gun and impinging on the end of the flange portion scattering toward the fluorescent film side to erroneously emit the fluorescent film. can do.
In addition, the planar color cathode ray tube according to the present invention forms an inclined surface and an electron beam reflecting surface on the inner side and the outer side of the flange portion, respectively. It is possible to prevent the problem, and the problem that the resolution is lowered by emitting the phosphor layer of the unwanted fluorescent film can be reduced.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and those skilled in the art will understand that various modifications and variations are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (3)

A panel having a fluorescent film formed on an inner surface thereof; A tension mask frame assembly having a frame including a tension mask installed at an inner side of the panel, a support member supporting the tension mask, and an elastic member supporting the support member; A funnel sealed to the panel; An electron gun mounted to the neck portion of the funnel; And A deflection yoke mounted on an outer circumferential surface of the neck portion to deflect an electron beam emitted from the electron gun, The support member of the frame has a support portion for supporting the tension mask and a flange portion extending inwardly from the support portion, And the flange portion has an electron beam reflecting surface for reflecting an electron beam colliding with the flange portion of the electron beam incident toward the fluorescent film toward the opposite side of the fluorescent film. The method of claim 1, And an inclined surface is formed at the inner end of the flange to reduce interference in the traveling direction of the electron beam. The method of claim 1, The reflecting surface is a planar color cathode ray tube, characterized in that formed inclined on the entire cross-section.

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