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. 30, 2016
Filed:
May. 20, 2014
Piedek Technical Laboratory, Tokyo, JP;
Hirofumi Kawashima, Tokyo, JP;
PIEDEK TECHNICAL LABORATORY, , JP;
Abstract
In a quartz crystal unit, the unit comprising a quartz crystal resonator having an overall length less than 2.1 mm, and a base portion, and first and second vibrational arms, at least one groove being formed in at least one of opposite main surfaces of each of the first and second vibrational arms so that a width of the at least one groove is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second vibrational arms and less than 0.07 mm, at least one metal film for adjusting an oscillation frequency of the quartz crystal resonator being disposed on at least one of the opposite main surfaces of each of the first and second vibrational arms.