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:
Apr. 18, 2006
Filed:
Apr. 14, 2004
Sadao Kawata, Niigata-ken, JP;
Sadao Kawata, Niigata-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
In a charge potential evaluation device, the measured value of a potential difference Vin a charged plate monitor (CPM) is converted into a potential difference Vbetween the conductive pattern and load beam in a head gimbal assembly (HGA), using the following expression (1),where ddenotes the distance between the conductive pattern and the load beam in the HGA, ddenotes the distance between the conductive plate and a grounded surface in the CPM, εdenotes the relative permittivity of an insulating foundation layer in the HGA, and εdenotes the relative permittivity of the region between the conductive plate and the grounded surface in the CPM.