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. 27, 2007
Filed:
May. 26, 2004
Tomoo Ikeda, Tokorozawa, JP;
Tomoo Ikeda, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A method for manufacturing quartz oscillators is provided which permits quartz oscillators having an oscillation frequency, as designed, to be obtained with small variation of individual oscillation frequency and with high reliability. The method for manufacturing quartz oscillators according to the present invention comprises the steps of forming a first resist layer () on one surface of a quartz substrate (), exposing said first resist layer to light of a first amount of exposure to form a patterned first masking layer (), forming a second resist layer () on the other surface of said quartz substrate, exposing said second resist layer to light of a second amount of exposure via said quartz substrate to form a patterned second masking layer () by using said first masking layer, and etching said quartz substrate to form quartz pieces () by using said patterned first masking layer and said patterned second masking layer.