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:
Dec. 11, 2012
Filed:
Jul. 23, 2008
Hideryo Matsudo, Saitama, JP;
Hideryo Matsudo, Saitama, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a tuning-fork type crystal resonator in which the frequency adjustment accuracy is increased, and a frequency adjustment method thereof. In a tuning-fork type crystal resonator having a tuning-fork shaped piece of quartz crystal in which a pair of tuning fork arms extend from a tuning fork base, and a frequency adjustment method thereof, there is provided a first frequency adjustment step for adjusting an oscillation frequency by forming inclined surfaces spanning from outer peripheral surfaces surrounding the pair of tuning fork arms toward distal end surfaces, by using a femtosecond laser irradiated in a direction from the outer peripheral surfaces toward the distal end surfaces, or in a direction from the distal end surfaces toward the outer peripheral surfaces.