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Method for designing CRT frame

A cathode ray tube and design method technology, applied in the field of color picture tubes, can solve the problems of abnormal reflection and disturbing color spots, shadows on effective pictures, affecting strength and cost, etc., and achieve the reduction of thermal arch drift and heat reduction. Arch, anti-reflection effect

Inactive Publication Date: 2009-10-21
IRICO DISPLAY DEVICES
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Problems solved by technology

[0004] The opening at the bottom of the frame is a door frame in the passage of the electron beam. For the tube type without electromagnetic shielding components, the shape of this opening is the key to controlling the scanning area. If the opening is too small, the electron beam will be blocked by it and the effective screen will be generated. Shadow, too large may produce abnormal reflections and other disturbing color spots, and the size of the opening also affects the strength and cost to a certain extent

Method used

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  • Method for designing CRT frame

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Embodiment Construction

[0030] refer to figure 1 As shown, I-1 is the fluorescent surface (curved surface inside the screen), which can be accurately obtained according to the theoretical equation. III-2 is the theoretical position plane where the frame opening is located, and its position can be determined according to the overall structural design drawing. 1-3 and 1-4 are respectively the envelope surfaces of the maximum areas of vertical and horizontal scanning motions. They can be connected according to the three deflection center points of the theoretical electron beam vertical, horizontal and diagonal, respectively, and the endpoints on the long axis, short axis and diagonal axis of the corresponding maximum phosphor surface (considering overscan). The approximate ruled surface made after the line. This results in the intersection line 1-5 of the scanning envelope surfaces 1-3, 1-4 and the frame opening plane III-2. This is the initial shape of the opening at the bottom of the frame.

[003...

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Abstract

The invention discloses a method for designing a CRT frame. The method obtains the size and shape of the bottom opening of the frame by designing the optimal size of the long axis, short axis and diagonal axis section of the frame bottom opening, which can guarantee the strength and reduce the Small thermal arches, anti-reflection, and cost reduction have been contradictoryly unified, which significantly improves the first-time success rate of frame design. Especially in widescreen CRTs, the effect of reducing thermal arching is very significant. In the research and development of a wide-screen tube type, under the condition that other conditions remain unchanged, the method of the present invention is used to reduce the thermal arch drift of the sensitive area in the effective surface of the screen by 30% by improving the size and shape of the opening at the bottom of the frame.

Description

technical field [0001] The invention belongs to the technical field of color picture tube frame design of a thin color picture tube, in particular to a design method of a frame for a CRT. Background technique [0002] The frame is the largest metal part in the cathode ray tube CRT. It is not only the substrate for the assembly of the shadow mask assembly, but also controls the scanning area of ​​the electron beam and prevents the spot caused by reflection. Correct design can also reduce the drift caused by thermal arching. [0003] As the base of the shadow mask component, firstly, the shape and size of the frame should match the shape of the shadow mask to ensure correct and reasonable assembly and welding of the shadow mask; It will not fall off or shift during transportation etc. For the side-sealed suspension, the strength requirement is stricter than that of the four-corner suspension; as the largest metal part in the cathode ray tube CRT, how to reduce weight and cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/07H01J29/02
Inventor 赵天有徐莉华赵军鲁小平杨威
Owner IRICO DISPLAY DEVICES
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