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Short-flow path high-yield production method of cold cathode MO cup

A technology with high yield and high manufacturing method, applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of poor finish, high cost, plastic deformation marks, etc., and achieve simple and mature processing technology , good surface quality and short production process

Inactive Publication Date: 2008-09-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Domestically, due to the quality of raw materials and equipment, it is not yet possible to extend the production of backlight cold cathode Mo cups.
[0004] From Mo powder raw material to mirror Mo sheet, it needs to go through multiple processes such as powder pressing into slab, slab sintering, billet rolling, repeated forming rolling, vacuum annealing, polishing, etc. The yield of rolled material is only 50%, High energy consumption, lengthy production process, high cost, large investment in equipment for rough and finish rolling mills of various specifications, and huge workload for equipment maintenance
From the mirror surface Mo sheet to the backlight cold cathode Mo cup product, it needs to go through the drawing molding process, and the drawing equipment investment is huge, and the Mo cup yield is very low (only 80~90%)
In addition, there is a draft taper on the cylindrical surface of the product, and it does not fit well with the inner wall of the CCFL lamp tube; there are obvious signs of plastic deformation on the inner surface, and the finish is not good

Method used

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Embodiment Construction

[0008] 1. The outer diameter is The 1.7mm moss wire raw material with a purity of 99% is straightened and blanked to obtain a 5mm long cylindrical blank. by 1.33 x 10 -2 ~1.33×10 -4 Under the vacuum degree, the power density is 10 4 ~10 9 W / cm 2 The electron beam bombards the top surface of the blank, which can produce 20 outer diameters per second 1.7mm, wall thickness 0.15mm, length 5mm backlight cold cathode Mo cup. The yield rate of Mo cup is 100%; the outer diameter is uniform and there is no taper; the roughness of the inner hole wall is controlled at about Ra0.3μm, which meets the requirements of the mirror molybdenum sheet surface; the metallographic microstructure is excellent.

[0009] 2. The outer diameter is The 2.1mm moss wire raw material with a purity of 98% is straightened and blanked to obtain a 4mm long cylindrical blank. Use ruby, neodymium glass, neodymium-doped yttrium aluminum garnet or CO with output power of 1~10000kW 2 The laser beam bombar...

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Abstract

The invention provides a short-flow high yield fabrication method of a cold cathode Mo cup, belonging to a deep small blind hole processing method of Mo material. Mo silk with purity more than 95% is taken as raw material, and the back light source Mo cup is processed by one of the processing techniques of electron beam, laser beam and electric spark small hole. Compared with the extensile forming process of currently used mirror surface Mo sheet, the price of raw material is low, the equipment is simple, the production flow is sort, the yield and the surface smoothness are high, and microstructures are controllable. The short-flow high yield fabrication method of a cold cathode Mo cup is applied to the processing method of back light source component fluorescence lamp cold cathode Mo cup in slab display and corresponding industries.

Description

technical field [0001] The invention relates to a short-flow, low-cost and high-yield production method for Mo cup electrodes of a cold cathode backlight source for flat panel display. Background of the invention [0002] Large-size flat panel displays, especially TFT-LCD displays, have become the focus of development and have become the mainstream of the market. The backlight module is an indispensable key component of the TFT-LCD display, and it occupies an important position in the cost composition of the liquid crystal. Cold Cathode Fluorescent Lamp (CCFL) backlight is currently the mainstream product, except for a few small-sized products such as mobile phones, it occupies an absolute majority of the market share in most LCD fields. Cold cathode is a crucial component in CCFL. Studies have shown that the cold cathode Mo cup electrode has better emissivity and sputtering tolerance than the currently commonly used Ni cup electrode, and replacing Ni with Mo with a lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/02B23P15/00B23K15/08B23K26/38B23H9/14
Inventor 汪涛陶杰陶海军潘蕾骆心怡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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