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. 25, 2005
Filed:
Mar. 04, 2003
Mark A. Church, Los Gatos, CA (US);
Alain M. L. Desouches, Santa Cruz, CA (US);
Glenn P. Gee, San Jose, CA (US);
Mark A. Church, Los Gatos, CA (US);
Alain M. L. Desouches, Santa Cruz, CA (US);
Glenn P. Gee, San Jose, CA (US);
Abstract
An apparatus and method of lapping of rows of magnetic recording heads uses multiple fluid-filled ports with variable pressure against a flexible adhesive tape to secure to and support the row. The tape provides the necessary tangential restraining force to drag the workpiece along a lapping plate. The multiple ports beneath the tape provide the necessary normal force to press the workpiece against the lapping plate to allow lapping to occur. The amount of material removal from the row is varied by adjusting the pressure in the ports such that higher pressure is applied to those heads with higher stripe height, and lower pressure is applied to recording heads with lower stripe height. To set or adjust the port pressures, measurements of the read sensor resistance are taken to calculate the stripe height. The stripe height is roughly proportional to the reciprocal of resistance.