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:
Mar. 31, 1998
Filed:
Sep. 04, 1996
Tomonao Hayashi, Musashino, JP;
Osamu Tsukakoshi, Chigasaki, JP;
Toshio Koike, Chigasaki, JP;
Takashi Kawashima, Tokorozawa, JP;
Nihon Shinku Gijutsu Kabushiki Kaisha, Kanagawa-ken, JP;
Abstract
A quadrupole mass spectrometer which gives a uniform mass separation over a large mass number range without being affected by the nob-linear characteristics of the components of a control circuit arrangement and comprises an all-solid-state control circuit by using an O-method according to the invention to compare the positive or negative peak value U+V or U-V of U+Vcos.omega. t or the positive or negative peak value V-U or --U+V of --U-Vcos.omega. t, U+Vcos.omega. t and --U-Vcos.omega. t being voltages given to two pairs of rods of a quadrupole section respectively, to reference voltage (U.sub.o +V.sub.o) or (U.sub.o -V.sub.o) or (--U.sub.o +V.sub.o) or (--U.sub.o -V.sub.o), U.sub.o and V.sub.o being a DC voltage and the peak value of RF voltage to which U and V should be controlled and minimize the difference between the peak value (RF+DC) voltages to the high precision reference voltages as mentioned above.