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:
Jul. 07, 2009
Filed:
Dec. 28, 2005
Naoki Onishi, Sayama, JP;
Tsuyoshi Shiobara, Sayama, JP;
Naoki Onishi, Sayama, JP;
Tsuyoshi Shiobara, Sayama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
The present invention prevents instability of frequency measurement caused by spatial connection between quartz sensors adjacent to each other when a plurality of quartz sensors, including a quartz resonator which varies a national frequency due to adsorption of an object, are to be detected. A common measuring unit measures a variation in frequency of each oscillation circuit corresponding to each quartz sensor by switching and connection in turn, and the oscillation circuits, excepting an oscillation circuit connected to the measuring unit by switches, are connected to a load on the output side of the oscillation circuit channels connected to the measuring unit and the load value is such that the respective oscillating frequencies are forcibly separated from each other.