Color CRT

专利摘要:
The present invention relates to a frame mask structure of a flat color cathode ray tube, comprising: a panel having a phosphor coated on an inner surface thereof, a funnel having a neck portion fused to a rear side of the panel, on which an electron gun is mounted, and a shadow mounted on the inside of the panel; In a color cathode ray tube comprising a main frame for tensioning and attaching a mask and a subframe coupled to the main frame to apply a tensile force to a shadow mask, wherein the main frame and / or subframe have an external magnetic field. An inner shield for shielding is mounted; An end surface of the main frame and / or subframe on which the inner shield is mounted is inclined at least partially toward the tube axis. Accordingly, the structure of the subframe can be improved in weight, the skirt of the inner shield for shielding the geomagnetic field can be shortened, and the inner shield can be welded without separating the frame mask structure, thereby simplifying the process. .
公开号:KR20020067072A
申请号:KR1020010007404
申请日:2001-02-15
公开日:2002-08-22
发明作者:김병철
申请人:엘지전자주식회사；
IPC主号:

专利说明:

Color Cathode Ray Tube {Color CRT}
[19] The present invention relates to a frame mask structure of a color cathode ray tube, and more particularly, to improve the structure of the subframe to reduce the weight, to shorten the skirt portion of the inner shield, and to simplify the process of welding the inner shield to the frame. The present invention relates to a colored cathode ray tube.
[20] Figure 1 shows a partially cut away side cross-sectional view to show the internal configuration of a typical color cathode ray tube.
[21] As shown in the drawing, the color cathode ray tube is fused by a panel 10 having red, green and blue phosphors 11 coated on the inner side thereof to form a fluorescent surface, and a glass against the rear of the panel 10. The appearance is formed by the funnel 20 which maintains the internal pressure at a high vacuum of about 10 ⁻⁷ Torr.
[22] Inside the panel 10, a shadow mask 40 having a fine pore-shaped hole (or slit) 41, which serves as color screening, is mounted on the frame 30, and the frame 30 is a spring 50. Is supported on the inner side of the panel 10.
[23] In addition, an inner shield 60 is mounted to the rear of the frame 30 to prevent the electron beam scanned by the electron gun, which will be described later, from being affected by an external magnetic field.
[24] As shown in FIGS. 2 to 3, the frame 30 includes a main frame 31 to which the shadow mask 40 is welded, and a subframe 32 to apply a tensile force to the main frame. The inner shield 60 is mounted at both ends of the subframe.
[25] On the other hand, a neck portion 70 is provided at the rear of the funnel 20, and an electron gun 80 for scanning the electron beam 71 visualized in the drawing representation is mounted inside the neck portion 70.
[26] A deflection for deflecting the electron beam 71 scanned by the electron gun 80 to the entire fluorescent surface to which the phosphor 11 is applied is located at the boundary between the rear of the funnel 20 and the neck portion 70. Yoke 90 is mounted.
[27] Unexplained letter "B" in the figure is a reinforcing band for reinforcing the joint portion of the panel and the funnel.
[28] Therefore, when the electron beam 71 is radiated by the electron gun 80, the emitted electron beam 12 passes through the hole 41 formed in the shadow mask 40 to form a phosphor formed on the inner surface of the panel 10. 11) and the phosphor 11 emits light, thereby reproducing an image through the panel 10.
[29] Hereinafter, the frame mask assembly will be described in detail. In FIG. 2, the frame for tensioning and attaching the shadow mask in one direction includes a main frame 31 and a subframe 32.
[30] The main frame 31 is a portion to which the shadow mask is welded. The main frame 31 is spaced apart from the panel at regular intervals and maintains a constant curved surface on the upper part of the main frame so that the electron beam passing through the shadow mask hole can be hit on the fluorescent surface accurately. Secure the shadow mask.
[31] The subframe 32 fixes the main frame 31 to which the shadow mask is welded at regular intervals to apply sufficient tensile force to the shadow mask to reduce vibration caused by external shocks or vibration waves, and the electron beam strikes a predetermined phosphor precisely. To keep it fixed.
[32] In the frame in which the main frame is welded to the upper part of the subframe, the subframe has been manufactured in a shape maintaining an angle parallel to the side wall of the main frame as shown in FIG. 3. Moreover, the inner shield which has the bent part according to the shape was produced. At this time, the inner shield shields the magnetic field generated by the geomagnetic field or the external magnetic material from acting inside the cathode ray tube so that the electron beam path is changed by the external magnetic field so that the beam passing through the shadow mask does not hit the desired phosphor. It is to prevent deterioration of color purity.
[33] The shadow mask is attached to the frame by compressing by applying a physical force to the side wall of the main frame 31 and then welding the shadow mask to the main frame 31. At this time, the strength of the frame should be sufficient to maintain sufficient tensile strength for the shadow mask. If a sufficient tension is not applied, the electron beam may not hit the desired position of the phosphor due to the shaking of the shadow mask due to an external impact, thereby failing to achieve an optimal color and luminance. As a result, because the strength of the frame must be strong, the thickness must be thick and the weight heavy.
[34] Thus, it leads to undesirable consequences of increasing the weight of the product.
[35] In addition, as in the prior art, the sub-frame end surface is parallel to the tube axis, and in order to attach the inner shield extending to the tube axis with an inclination toward the tube axis, at least one bent portion must be formed in the manufacture of the inner shield. As a result, not only is the cost increase in the inner shield manufacturing process, but also the unit area becomes wider, which leads to an increase in raw material prices.
[36] Accordingly, an object of the present invention is to solve the problems with the frame of the color cathode ray tube as described above, and to provide a lightweight colored cathode ray tube as a whole by reducing the weight of the subframe while providing sufficient tension of the shadow mask. have.
[37] Another object of the present invention is to change the structure of the sub-frame to facilitate the processing of the inner shield attached to the side, as well as to shorten its length to improve productivity, reduce the manufacturing cost and reduce the weight of the color cathode ray To provide a coffin.
[1] 1 is a partially cut-away cross-sectional view showing an example of a state in which a prime is installed in a general color cathode ray tube.
[2] Figure 2 is a perspective view showing the structure of a conventional frame.
[3] Figure 3 is a cross-sectional view showing a state in which the shadow mask and the inner shield is installed in the conventional frame.
[4] Figure 4 is a cross-sectional view showing a state in which the frame according to the present invention is installed in a common color cathode ray tube.
[5] 5 is a view showing a state that the inner shield is mounted on the frame of one embodiment according to the present invention.
[6] Figure 6 is a partially enlarged view showing the inner shield is mounted on the frame of an embodiment according to the present invention.
[7] Figure 7 is a cross-sectional view showing a state in which the inner shield is installed in the frame of another embodiment according to the present invention.
[8] Figure 8 is a cross-sectional view showing a state in which the inner shield is installed in the frame of another embodiment according to the present invention.
[9] Figure 9 is an analysis of the stress applied to the frame when tensioning after mask welding of the conventional frame.
[10] 10 is an analysis of the stress applied to the frame during tensioning after mask welding of the frame according to the present invention.
[11] *** Explanation of symbols for main parts of drawings ***
[12] 10: panel 11; phosphor
[13] 20; funnel 30; frame
[14] 31; main frame 42; subframe
[15] 40; shadow mask 41; hole
[16] 50; spring 60; inner shield
[17] 70; neck 71; electron beam
[18] 80; electron gun 90; deflection yoke
[38] A first embodiment of the present invention for achieving the above object is a panel having a phosphor coated on the inner surface, a funnel having a neck portion fused to the rear of the panel and the electron gun is mounted, and mounted inside the panel A color cathode ray tube comprising a main frame to which a shadow mask is welded and a sub frame coupled to the main frame to apply a tensile force to the shadow mask, wherein the main frame and / or the sub frame shield an external magnetic field. An inner shield to be mounted; An end surface of the main frame and / or subframe on which the inner shield is mounted is inclined at least partially toward the tube axis.
[39] The angle θ that is inclined toward the tube axis satisfies the following equation, 5 ° ≦ θ ≦ 80 °.
[40] The inner shield is attached to the subframe or the main frame and has an inclined portion at an angle θ 'toward the tube axis while surrounding the electron beam path, and on the side of the inclined portion attached to the main frame or the subframe. At least some of which are not bent.
[41] The inclination angle θ of the subframe or main frame end surface and the inclination angle θ ′ of the inner shield may be set similarly to each other.
[42] Preferably, the inner shield inclined portion is welded to the inclined portion of the subframe or main frame end surface.
[43] Another embodiment of the present invention, a panel coated with a phosphor on the inner surface, a funnel having a neck portion fused to the rear of the panel and the electron gun is mounted, and the main frame to which the shadow mask mounted on the inside of the panel is welded; In the color cathode ray tube comprising a frame consisting of a sub-frame coupled to the main frame for applying a tensile force to the shadow mask, the end of the sub-frame coupled to the main frame includes at least a curved surface or two or more surfaces It features.
[44] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in more detail.
[45] The same part number is attached | subjected about the same part and member as the conventional component among this invention.
[46] Figure 4 is a cross-sectional view showing the internal configuration of the color cathode ray tube installed frame is applied in the present invention. In the color cathode ray tube to which the present invention is applied, a panel 10 in which red, green, and blue phosphors 11 are coated on an inner surface to form a fluorescent surface is fused by glass to the rear of the panel 10, and The appearance is formed by the funnel 20 which maintains the pressure at a high vacuum of about 10 ⁻⁷ Torr.
[47] Inside the panel 10, a shadow mask 40 having a fine pore-shaped hole (or slit) 41, which serves as color screening, is mounted on the frame 30, and the frame 30 is a spring 50. Is supported on the inner side of the panel 10. In addition, an inner shield 60 is mounted to the rear of the frame 30 to prevent the electron beam scanned by the electron gun, which will be described later, from being affected by an external magnetic field. The frame 30 is divided into a main frame 31 to which the shadow mask 40 is welded and a subframe 32 to which the inner shield 60 is welded.
[48] On the other hand, a neck portion 70 is provided at the rear of the funnel 20, and an electron gun 80 for scanning the electron beam 71 visualized in the drawing representation is mounted inside the neck portion 70.
[49] A deflection for deflecting the electron beam 71 scanned by the electron gun 80 to the entire fluorescent surface to which the phosphor 11 is applied is located at the boundary between the rear of the funnel 20 and the neck portion 70. The yoke 90 is mounted and these components are roughly the same as those of the conventional color cathode ray tube described above.
[50] A feature of the present invention is that, as shown in Figs. 5 and 6, if both ends of the subframe 32 have a set angle θ and have a surface inclined toward the tube axis, the inner shield 60 is formed on the inclined surface. Is to be welded.
[51] At this time, the inner shield 60 has an inclined portion extending toward the tube axis while surrounding the electron beam propagation path along the funnel, and the inclined portion is welded to the inclined surfaces of both ends of the sub-frame 32, thereby naturally welding. Enable work. In particular, since only the opposite ends of the subframe are cut obliquely, it is possible to reduce the weight while maintaining the strength, and the welded portion of the inner shield needs to be welded directly to the subframe inclined portion to form a separate bent portion as in the prior art. none.
[52] The angle θ of the end inclined surface 32a of the subframe is set within a range of 5 ° ≦ θ ≦ 80 °, and is preferably formed to be substantially equal to the inclination angle θ ′ of the inclined portion of the inner shield. .
[53] FIG. 7 illustrates two surfaces by partially cutting an end portion of a subframe according to another embodiment of the present invention. According to this configuration, the process of attaching the inner shield is somewhat complicated compared to the embodiment of FIG. 6, but the weight of the subframe can be reduced to some extent and the skirt portion of the inner shield can be reduced.
[54] 8 is a further embodiment of the present invention, wherein the subframe 32 has at least one side end portion formed from a curved portion at both ends thereof, and at least one side end portion thereof has an inner circumferential surface corresponding to the curved portion. Inner shield 60 having a may be provided to be mounted by welding.
[55] The operation and effects of the present invention configured as described above will be described.
[56] Conventionally, the strength of the frame should be strong in order to deliver sufficient tensile force to the shadow mask, and accordingly, the thickness of the frame is increased to increase the weight and cost, and in the present invention, the end of the sub-frame has a predetermined angle (θ). Since it is manufactured as a short distance d per frame, the weight and unit length of the frame is reduced, the unit cost is reduced, and a lighter cathode ray tube can be manufactured.
[57] FIG. 9 is an analysis diagram of a stress applied to a frame when tensioning after shadow mask welding of a conventional frame, and it can be seen that almost no stress is applied to the outside of the line connecting the lower ends A and A 'of the subframe.
[58] 10 is an analysis diagram of the stress applied to the frame during tensioning after the shadow mask welding of the frame according to the present invention, it can be seen that the srm does not affect the stress of the sub-frame even if a certain slope at the end.
[59] Therefore, even if the end portion of the sub-frame has an inclined surface, it does not affect the tensile strength of the shadow mask much, so does not affect the quality of the cathode ray tube.
[60] As a result, the bending process of the inner shield is not necessary, resulting in a reduction in unit cost due to process reduction and a unit cost reduction factor due to reduction of raw materials used.
[61] In addition, in the method of welding the inner shield, the skirt length of the inner shield is longer because the welding is performed on the side of the main frame, and the frame mask structure is separated from the panel and welded. Since the inclined inner shield is welded on the inclined surface as it is, the skirt of the inner shield can be reduced, and the inner shield can be welded while the frame mask structure is mounted on the panel. There is also a reduction in manufacturing costs.
[62] As described in detail above, according to the present invention, the weight of the subframe is made lighter, and the structure of the subframe is changed to not only facilitate the processing of the inner shield attached to the side, but also shorten its length, thereby reducing raw material cost. And there is also a feature that can lower the manufacturing cost.
[63] So far, the preferred embodiments of the present invention have been described and illustrated in detail, but are not limited thereto, and various modifications and changes can be made by those skilled in the art.
[64] However, it is apparent that such simple modifications fall within the scope of the present invention described in the claims.

权利要求:
Claims (6)
[1" claim-type="Currently amended] A shadow mask in combination with a main frame to which a panel is coated with a phosphor on an inner side, a funnel having a neck portion fused to a rear side of the panel, on which an electron gun is mounted, and a main frame to which a shadow mask mounted on the inside of the panel is welded is welded. In the color cathode ray tube comprising a frame consisting of a sub-frame for applying a tensile force to,
The inner frame and / or the sub frame are equipped with an inner shield for shielding an external magnetic field; And an end surface of the main frame and / or subframe on which the inner shield is mounted is at least partially inclined toward the tube axis.
[2" claim-type="Currently amended] The method of claim 1,
The angle of inclination (θ) toward the tube axis satisfies the following formula.
5 ° ≤θ≤80 °
[3" claim-type="Currently amended] The method of claim 1,
The inner shield is attached to the subframe or the main frame and has an inclined portion at an angle θ 'toward the tube axis while surrounding the electron beam path, and on the side of the inclined portion attached to the main frame or the subframe. Color cathode ray tube, characterized in that at least a portion is not bent.
[4" claim-type="Currently amended] The method of claim 1,
And the inclination angle [theta] of the sub-frame or main frame end surface and the inclination angle [theta] 'of the inner shield are similar to each other.
[5" claim-type="Currently amended] The method of claim 1,
And the inner shield inclined portion is welded to the inclined portion of the subframe or the main frame end surface.
[6" claim-type="Currently amended] A shadow mask in combination with a main frame to which a panel is coated with a phosphor on an inner side, a funnel having a neck portion fused to a rear side of the panel, on which an electron gun is mounted, and a main frame to which a shadow mask mounted on the inside of the panel is welded is welded. In the color cathode ray tube comprising a frame consisting of a sub-frame for applying a tensile force to,
An end portion of the subframe coupled to the main frame includes at least a curved surface or two or more surfaces.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-02-15|Application filed by 엘지전자주식회사

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2001-02-15|Priority to KR1020010007404A

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2002-08-22|Publication of KR20020067072A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020010007404A|KR20020067072A|2001-02-15|2001-02-15|Color CRT|