KR20010084449A - Cathod ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided to reduce vibration of shadow mask and allow the inner shield to be mounted in a stable and easy manner. CONSTITUTION: A cathode ray tube comprises a panel(401) having a glass front surface with a fluorescent surface formed inside of the glass front surface; a funnel(406) coupled to the panel, and which has a plurality of necks with electron guns encapsulated in necks; a frame(404) attached to the inner surface of the panel; a shadow mask(403) fixed to the frame, and which has a plurality of effective surfaces(407) having a plurality of through holes for passage of electron beam, a peripheral portion(408) where through holes are not formed, and a boundary portion(409) arranged between effective surfaces and where through holes are not formed; an inner shield(405) arranged inside the funnel, and which shields geomagnetism; and one or more support members(410) arranged at the boundary portion of the shadow mask.

Description

Cathode ray tube {Cathod ray tube}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathod ray tube, and more particularly, to a cathode ray tube having a plurality of necks each of which an electron gun is enclosed, and in particular, the shaking phenomenon of a shadow mask caused by external vibration. The present invention relates to a cathode ray tube which can reduce and stably and easily mount an inner shield.

The structure of the conventional cathode ray tube is as shown in FIG. Referring to FIG. 1, a cathode ray tube includes a panel 101, which is a front glass part, a funnel 106, which is a rear glass part that is coupled to the panel 101, an electron gun 107 that emits electrons, A shadow mask 103 for sorting the fluorescent surface 102 emitted by the incident of the electron beam 109 emitted from the electron gun 107, the electron beam 109 incident on the fluorescent surface 102, and It includes a frame 104 to which the shadow mask 103 is attached and an inner shield 105 that serves as an external geomagnetic shield to reduce the influence from the external geomagnetic.

On the other hand, the fluorescent surface 104 in which the electron beam 109 emitted from the electron gun 107 embedded in the neck 110 of the funnel 106 by the anode voltage applied to the cathode ray tube is formed on the inner surface of the panel 101. In this case, the electron beam 109 is deflected up, down, left, and right by the deflection yoke 108 before reaching the fluorescent surface 102.

However, as socio-cultural demands increase, there is a need for high definition, high resolution cathode ray tubes for use in high definition televisions, or cathode ray tubes for large high resolution graphic display devices for use as computer monitors. Research and development are underway to satisfy the needs. However, a large-sized cathode ray tube having high definition and high resolution has a problem of solving a problem such as a volume of an excessively large cathode ray tube and a decrease in intensity of an electron beam on a screen. As one method for solving this problem, a cathode ray tube having a plurality of necks is disclosed in European Patent Application No. 86106262.8 (Publication No. 0201865) and the like.

2 is a cross-sectional view schematically showing a conventional cathode ray tube having four necks, and FIG. 3 is a view illustrating a shadow mask attached to a panel in the cathode ray tube of FIG. 2.

2 and 3, a cathode ray tube having four necks is combined with a panel 201, which is one front glass part, and the panel 201, and four necks 210_1, 210_2, and two necks. Funnel 206, which is a rear glass part provided with each other, and provided in each of the necks 210_1 and 210_2, and are emitted from electron guns 207_1 and 207_2 through which electrons are emitted, and the electron guns 207_1 and 207_2. The fluorescent surface 202 emitted by the incident light of the electron beam 209, the shadow mask 203 for selecting the electron beam 209 incident on the fluorescent surface 202, and the shadow mask 203 It includes a frame 204 to be attached. In addition, deflection yokes 208_1 and 208_2 are provided in the necks 210_1 and 210_2 to adjust the deflection direction of the electron beam 209.

On the other hand, the electron beam 209 is emitted from the left electron gun 207_1, is deflected to the right by the deflection yoke 208_1 and collides with the fluorescent surface 202, and is emitted from the electron gun 207_2 on the right side, and the deflection yoke 208_2. The electron beam 209 which is deflected to the left side and impinges on the fluorescent surface 202 is not overlapped and must have a continuous boundary. Accordingly, the shadow mask 203 may include four mask effective surfaces 211 having a plurality of through holes for passing the electron beam, a mask peripheral portion 212 having no through holes formed therebetween, and a through hole between the mask effective surfaces. It is divided into the mask boundary portion 213 which is not formed. Here, the width of the mask boundary 213 is set by various factors such as resolution, deflection angle, number of necks, and the like.

In addition, the funnel shape of the cathode ray tube becomes more complicated as the number of necks attached to it becomes complicated, because the electron beam emitted from the electron gun enclosed in the neck must be properly inclined so as to pass through without hitting the wall of the funnel. Since the deflection yoke is attached as many as the number of necks attached, its shape becomes complicated.

However, as described above, in the case of using one inner shield, the enlarged cathode ray tube has a problem in that the shape of the inner shield is too complicated, and the stability is poor even when attached to the frame. In addition, as the size of the cathode ray tube is increased, the size of the shadow mask employed is also increased, and thus, the shaking phenomenon of the shadow mask due to external vibration is increased.

The present invention has been made in view of the above problems, and in the cathode ray tube having a plurality of necks in which an electron gun is enclosed, respectively, the vibration phenomenon of the shadow mask due to external vibration is reduced, and the inner shield is stably and easily installed. The purpose is to provide a cathode ray tube that can be.

1 is a cross-sectional view schematically showing a conventional cathode ray tube.

Figure 2 is a schematic cross-sectional view of a conventional cathode ray tube having four necks.

3 illustrates a shadow mask attached to a panel in the cathode ray tube of FIG. 2; FIG.

4 is a cross-sectional view schematically showing a cathode ray tube having four necks according to the present invention.

FIG. 5 illustrates a shadow mask attached to a panel in the cathode ray tube of FIG. 4. FIG.

<Explanation of symbols for the main parts of the drawings>

101, 201, 401 ... Panel 102, 202, 402 ... Fluorescent

103, 203, 403 ... shadow mask 104, 204, 404 ... frame

105, 405 ... Inner Shield 106, 206, 406 ... Funnel

107, 207_1, 207_2 ... Electron gun 108, 208_1, 208_2 ... deflection yoke

109, 209 ... electron beam 110, 210 ... neck

211, 407 ... mask effective face 212, 408 ... mask perimeter

213, 409 ... mask boundary 410 ... support

Cathode ray tube according to the present invention in order to achieve the above object,

A panel having one glass front surface with a fluorescent surface formed therein;

A funnel coupled to the panel and having a plurality of necks each having an electron gun encapsulated therein;

A frame attached to an inner surface of the panel;

A plurality of mask effective surfaces fixed to the frame and corresponding to the number of necks, the plurality of mask effective surfaces having a plurality of through holes for passing the electron beam, a mask peripheral portion where no through holes are formed, and a through hole between the mask effective surfaces are formed A shadow mask having unmasked borders;

An inner shield provided inside the funnel and shielding an external geomagnetic; And

It is characterized in that it comprises at least one support provided in the mask boundary of the shadow mask.

Here, the inner shield is provided in plural in correspondence with each neck with respect to the plurality of necks, and is characterized in that it is provided on the support and the frame, respectively.

In addition, the support is installed in close contact with the mask boundary of the shadow mask.

According to the present invention, by providing a separate support at the mask boundary of the shadow mask, there is an advantage to reduce the shaking phenomenon of the shadow mask due to external vibration. In addition, by attaching the inner shield to the support and the frame, respectively, there is an advantage that can improve the attachment stability of the inner shield.

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

4 is a cross-sectional view schematically showing a cathode ray tube having four necks according to the present invention, and FIG. 5 is a view showing a shadow mask attached to a panel in the cathode ray tube of FIG. 4.

4 and 5, a cathode ray tube having four necks according to the present invention is combined with a panel 401 having a glass front part having a fluorescent surface 402 formed therein, and a panel 401. And a funnel 406 having a plurality of necks (not shown) each having an electron gun (not shown), a frame 404 attached to an inner surface of the panel 401, and tensioned in two or four directions. A plurality of mask effective surfaces 407 fixed to the frame 404 and corresponding to the plurality of neck numbers, the plurality of mask effective surfaces 407 having a plurality of through holes for passage of the electron beam, a mask peripheral portion 408 having no through holes formed therein, and A shadow mask 403 having a mask boundary portion 409 without a through hole formed between the mask effective surfaces 407, an inner shield 405 provided inside the funnel 406, and shielding external geomagnetism and the shadows. Passing through the mask boundary 409 of the mask 403, One or more supports 410 are attached to the frame 404.

In addition, the inner shield 405 is provided in plural to correspond to each neck with respect to the plurality of necks, and is attached to the support 410 and the frame 404. In addition, the support 410 is formed in close contact with the mask boundary 409 of the shadow mask 403.

Here, the width and thickness of the support 410 should be such that the electron beam deflected by the electron gun does not interfere with the support to form a shadow on the screen. This is because the larger the number of the necks in which the electron gun is enclosed, the smaller the width becomes, and the higher the cathode ray tube, the smaller the width becomes. As such, the width and thickness of the support 410 are appropriately set according to the design of the cathode ray tube.

In addition, the material of the support 410 should be made of a material similar to the thermal expansion coefficient of the panel 401 or the frame 404. In this case, when the support 410 of a material having a different thermal expansion rate from the panel 401 or the frame 404 is used, there is a risk that the panel 401 or the frame 404 may be deformed or damaged during the high temperature process of manufacturing the cathode ray tube.

4 and 5, in the case of a four-neck cathode ray tube in which an electron gun is enclosed, one horizontal support 410 and one vertical support 410 are used. Here, the support 410 is attached to the frame 404 so as to pass through the mask boundary portion 409 formed between the plurality of mask effective surfaces 407 having a plurality of through holes for passing the electron beam. In this case, the inner shield 405 may be attached to the support 410 and the frame 404 to be stably mounted.

As such, when the inner shield 405 is attached to the support 410 and the frame 404, the size of the inner shield 405 may be such that each inner shield 405 reaches the neck. Therefore, the shielding effect of the external geomagnetic becomes excellent.

In addition, the support 410 absorbs the vibration of the shadow mask 403 generated by the impact from the outside of the cathode ray tube, and serves to reduce the vibration.

In the case of a nine-neck cathode ray tube enclosed with an electron gun, two horizontal supports and two vertical supports may be used. Of course, in this case, all the inner shield attached to the center is attached only to the support.

On the other hand, when the shape of the frame to which the shadow mask is tensioned and attached is formed with a constant curvature on one side (long side or short side) of the frame, the shadow mask is stretched in two directions and attached to the frame. Accordingly, since the shadow mask in the stretched direction is formed in a straight line, the support is attached to the frame so as to cross the mask boundary surface of the shadow mask in the same direction as the stretch direction. And even in such a case, each inner shield to be attached is mounted stably and easily by being attached to the said support body and the said frame. In addition, the shaking phenomenon of the shadow mask due to external vibration is reduced by the support.

As described above, the cathode ray tube according to the present invention has an advantage of reducing the shaking phenomenon of the shadow mask due to external vibration by providing a separate support at the mask boundary of the shadow mask. In addition, by attaching the inner shield to the support and the frame, respectively, there is an advantage that can improve the attachment stability of the inner shield.

Claims (3)

A panel having one glass front surface with a fluorescent surface formed therein; A funnel coupled to the panel and having a plurality of necks each having an electron gun encapsulated therein; A frame attached to an inner surface of the panel; A plurality of mask effective surfaces fixed to the frame and corresponding to the number of necks, the plurality of mask effective surfaces having a plurality of through holes for passing the electron beam, a mask peripheral portion where no through holes are formed, and a through hole between the mask effective surfaces are formed A shadow mask having unmasked borders; An inner shield provided inside the funnel and shielding an external geomagnetic; And Cathode ray tube characterized in that it comprises one or more supports installed on the mask boundary of the shadow mask. The method of claim 1, The inner shield is provided with a plurality of necks corresponding to each neck with respect to the plurality of necks, characterized in that provided in the support and the frame, respectively, characterized in that the cathode ray tube. The method of claim 1, The supporter is a cathode ray tube, characterized in that installed in close contact with the mask boundary of the shadow mask.