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:
Jul. 24, 2012
Filed:
Apr. 01, 2009
Jun Watanabe, Hino, JP;
Jun Watanabe, Hino, JP;
Seiko Epson Corporation, , JP;
Abstract
An acceleration sensing device includes: an outer frame; a first drive arm having both ends supported by sides of the outer frame through respective base parts, the sides opposing each other; a second drive arm extending from one of the base parts of at least one of the sides toward the other side; and a sensing arm that is disposed midway between the first drive arm and the second drive arm and extends form the one base part of the one side toward the other side, the sensing arm having an electrode in order to extract electric charge generated in the sensing arm. In the device, the first drive arm and the second drive arm have excitation electrodes for a flexural vibration and form a tuning fork type resonator, and center positions in thicknesses of sections that are located in the base parts and on an extension line of the first drive arm differ from a center position in a thickness of the first drive arm.