专利检索 ap:("ISAO MATSUI" OR "YOSHIHISA MINAMIKAWA" OR "SHINJIRO KATAGIRI" OR "TERUO NAKAHARA") AND inv:"MINAMIKAWA YOSHIHISA" 第 1 页

1.

发明授权
Automatic control system for varying a d.c. high voltage for accelerating tube of electron microscope and the like 失效
标题翻译：自动控制系统，用于改变电子显微镜加速管等的直流电压

公开(公告)号：US3691377A

公开(公告)日：1972-09-12

申请号：US3691377D

申请日：1971-01-06

申请人： ISAO MATSUI , YOSHIHISA MINAMIKAWA , SHINJIRO KATAGIRI , TERUO NAKAHARA

发明人： MATSUI ISAO , MINAMIKAWA YOSHIHISA , KATAGIRI SHINJIRO , NAKAHARA TERUO

IPC分类号： H02M7/04 , H01J37/24 , H02M7/12 , H01J37/26 , G01N23/00

CPC分类号： H01J37/241

摘要： The discharge which occurs in an accelerating tube of an electron microscope is detected by a detector and a comparing circuit determines whether or not the value of the detected discharge is larger or smaller than a predetermined value at which a spark occurs to produce a high level signal or a low level signal, respectively. The d. c. high voltage applied to respective accelerating electrodes in the accelerating tube is decreased or increased in response to said high level signal or said low level signal so as to suppress any undesired large discharge in the tube, and thereby prevent sparking therein.