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:
Oct. 01, 2002
Filed:
May. 13, 2000
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A frequency control apparatus including a shielding board that is provided with a window for exposing some or all of a plurality of electrodes disposed on a piezoelectric substrate, and a shutter for opening and closing the window. An aperture pattern board is provided between the shielding board and a piezoelectric resonator. On the aperture pattern board, combinations of apertures are provided which correspond to the A electrodes exposed through the window on the shielding board at one time. After measuring the frequencies for respective elements and measuring the variations from the target frequency, the suitable pattern of apertures is selected from the aperture pattern board according to the amount of variations, and then the frequency control is carried out only on the elements selected through the apertures.