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:
Aug. 20, 2013
Filed:
Aug. 14, 2012
Junichi Taniguchi, Kyoto, JP;
Junichi Taniguchi, Kyoto, JP;
Shimadzu Corporation, Kyoto-Shi, JP;
Abstract
An ion trap mass spectrometer with high sensitivity for detection in the high mass-to-charge ratio is provided. with separate measurement of square-wave voltages on the positive and negative electrode sides applied to a ring electrode in rectifying circuits and smoothing the measured voltages in integrating circuits, respectively, the areas of square-wave voltages on the positive and negative electrode sides are replaced with the peak values hand hof DC signals, respectively. A comparator circuit outputs the difference of said peak values as the error signal Δ, and variable delay circuits adjust the amount of delay of control signals so that the error signal Δ becomes zero. This changes the relative phase relation between control signals on the positive and negative electrode sides that turn on and off the switches, and renders the duty ratio of square-wave voltages nearly 50%.