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    • 29. 发明专利
    • Emitter chip for field ionization gas ion source
    • 用于现场离子化气体源的发射芯片
    • JPS5968142A
    • 1984-04-18
    • JP17735082
    • 1982-10-08
    • Fujitsu Ltd
    • ARIMOTO HIROSHI
    • H01J1/02H01J27/26H01J37/08H01L21/302
    • H01J27/26H01J2237/0807
    • PURPOSE:To obtain an ion source with high field intensity and high radiation ion current density whose emission site is restricted to a specified area by making the work function of a member which forms a tip larger than that of a member which forms the bottom. CONSTITUTION:A zirconium (Zr) coat 21 is formed by covering the entire of an emitter chip 3 with a metal with the smaller work function than tungsten W that is the material of the emitter chip 3, for example zirconium Zr. In this case, since a tip 11' has exceedingly small curvature as compared with that of the bottom 11, field intensity is increased and the zirconium of this area evaporates due to electric field. At the bottom, the coat 21 is formed as it is. As a result, the work function of the emitter chip is set to the value possessed by tungsten W, i.e. approximately 4.6eV at the tip 11' and on the other hand it is set to the value possesed by zorconium Zr, i.e. approximately 4.1eV at the bottom 11. The ionization of gas particles are collectively generated near the tip 11'.
    • 目的:获得具有高场强和高辐射离子电流密度的离子源,其发射位点通过使构成尖端的构件的功能大于构成底部的构件的尖端的功能而限制在特定区域。 构成:通过用作为发射体芯片3的材料的钨W(例如锆Zr)的功函数较小的金属覆盖发射体芯片3的整体来形成锆(Zr)涂层21。 在这种情况下,由于尖端11'与底部11相比具有非常小的曲率,因此场强增加,并且该区域的锆由于电场而蒸发。 在底部,直接形成涂层21。 结果,发射极芯片的功函数被设定为钨W所具有的值,即在尖端11'处约为4.6eV,另一方面被设定为由zorconium Zr所占的值,即大约4.1eV 在底部11处。气体颗粒的电离在尖端11'附近共同产生。