提高9顯象管邊緣分辨率的實驗研究
AN EXPERIMENTAL INVESTIGATION FOR IMPROVEMENT OF EDGE RESOLUTION OF 9 KINESCOPE
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摘要: 本文從分析9顯象管電子槍的結(jié)構(gòu)特點出發(fā),討論了影響熒光屏上電子束光點尺寸的三個主要因素:透鏡放大率、球面象差和空間電荷效應(yīng)。提出了用減小調(diào)制極孔徑,增大調(diào)制極與加速極之間的距離等方法來減小電子束最小交叉截面的尺寸和電子束的發(fā)散張角;并且以調(diào)整電子槍在顯象管內(nèi)的位置,即增大它與偏轉(zhuǎn)線圈之間的相對距離,來減小偏轉(zhuǎn)線圈雜散磁場所引起的偏轉(zhuǎn)散焦;從而有效地改善了整管的聚焦性能,并明顯地提高了邊緣部分的分辨率。 試驗結(jié)果和批量生產(chǎn)的管子測試表明:上述方法是卓有成效的,其邊緣分辨率能提高50線以上。
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關(guān)鍵詞:
Abstract: In kinescope electron gun design there are three chief factors which affect the final electron beam spot size. Thes are the magnification factor, the spherical aberration and the space charge effect. In this paper the interrelation between these factors and the resolution is discussed.In order to reduce beam crossover and divergence angle, some methods which make nse of reducing the aperture diameter of G1 and increasing the spacing between G1 and G2 are proposed. By adjusting the position of the electron gun in the kinescope i.e.increasing the distance between the gun and the yoke, the deflection defocusing which is caused by scattering magnetic field of deflection yoke is reduced. Therefore, focnsing performance of kinescope is improved effectively and its edge resolution is increased. Test data show that the above methods are excellent, the increment of edge resolution is better than 50 lines. -
SONY, テレビ技術(shù),27(1979),35.[2]I. M. Wilson, IEEE Trans. on CE, CE-21(1975), 32.[3]R. H. Hughes and H. Y. Cben, IEEE Trans. on CE, CE-25 (1979), 185.[5]清華大學(xué)無線電系,電子光學(xué),(1966), P.189, 192.[6]上海儀表電訊技術(shù)情報所,電視機(jī)和顯象管,日本來華技術(shù)座談資料,(1978), p. 180.[7]北京大學(xué)無線電系,無線電電子學(xué)資料,(1976), P. 35.[9]屠聿善,電子科學(xué)技術(shù),1980年,第4期,第4頁. -
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