The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2011
Filed:
Mar. 09, 2006
Shuichi Kawana, Osaka, JP;
Manabu Shimomura, Kyoto, JP;
Shuichi Kawana, Osaka, JP;
Manabu Shimomura, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
An electrically conductive heat-blocking platewith an openingfor allowing thermions to pass through is provided between a filamentwhose temperature can be as high as 2000° to 3000° C., and an ionization chamber. The heat-blocking plateis thermally connected via an aluminum blockto a heater for maintaining the ionization chamberwithin a range temperature from 200° to 300° C., and also electrically set at a ground potential, which is approximately equal to the potential of the ionization chamberThe heat-blocking plateblocks the radiation heat that the filamentemits when energized. Thus, the wall of the ionization chamberis prevented from being locally heated to an abnormally high temperature. As a result, the inner space of the ionization chamberis maintained at an approximately uniform temperature, and the noise due to the decomposition of a metallic material by abnormal heating is prevented. The heat-blocking platealso prevents a thermion-accelerating electric field from penetrating through an electron injection portinto the ionization chamberand impeding the extraction of ions produced within the ionization chamber. Thus, the ion extraction efficiency is also improved.