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:
Oct. 14, 2003
Filed:
Jul. 03, 2001
Takahiro Oguchi, Nagaokakyo, JP;
Yoshihiro Konaka, Nagaokakyo, JP;
Teruhisa Shibahara, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
When a cavity accommodating movable portion of an external force detecting sensor has a narrow structure, the external force detecting sensor is influenced by air damping, and therefore the cavity should have a wide structure. However, when a top surface and bottom surface of the cavity are positioned too high, the range of vertical movement of the movable portion is increased, and when an external impact force is applied to the external force detecting sensor, a movable interdigitated electrode rides on fixed interdigitated electrodes and stays there, thus the external force detecting sensor is rendered inoperable. A height D from the fixed interdigitated electrodes to the top surface and bottom surface of the cavity is set by having, as elements, widths of the movable interdigitated electrode, and fixed interdigitated electrodes set to W , W , and W , the height of the movable interdigitated electrode and fixed interdigitated electrodes set to h, and gaps between the movable interdigitated electrode and fixed interdigitated electrodes set to g and g , and the movable portion is structured so as to securely return to the standstill position due to resiliency of a beam.