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:
Jan. 27, 2009
Filed:
Oct. 03, 2007
Masakazu Harada, Saitama, JP;
Hidesada Takahashi, Oosaki, JP;
Masakazu Harada, Saitama, JP;
Hidesada Takahashi, Oosaki, JP;
Nihon Dempa Kogyo Co., Ltd., Tokyo, JP;
Abstract
The present invention relates to a crystal unit in which rectangular excitation electrodes are formed on two main surfaces of a rectangular crystal piece, an extracting electrode extends from at least one corner portion at each of two end portions from each of the excitation electrodes, and one of the corner portions of the crystal piece from which each extracting electrode extends is affixed by an electrically conductive adhesive to a step portion of the board, wherein a cutaway portion is provided in a corner portion of each of the excitation electrodes corresponding to one corner portion of the crystal piece, to increase the distance from the corner portion of the crystal piece, and the cutaway portion is formed as either a straight line or a curve. This provides a crystal unit in which contact between the excitation electrodes of the crystal piece and the electrically conductive adhesive is prevented, enabling reliable resonance.