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:
Dec. 31, 1996
Filed:
May. 15, 1995
Dale F Schudel, T. Lamsai A.Wangnoi, TH;
K. R. Precision Public Company Limited, Axutthaya, TH;
Abstract
A process for modifying the static attitude characteristics of magnetic head suspension assemblies by applying an infrared heat source to relieve stresses in specific regions of interest. Each assembly is tested to measure its static-roll attitude with respect to a datum reference plane; the measurement preferably consists of a deflection angle. If the deflection angle is outside the limits of a predetermined allowable tolerance, thereby indicating a region that requires subjection to a torsional stress to bring the suspension within tolerance, an infrared beam is applied specifically to the region while the load beam is held at the torsional deflected state. The infrared source stress relieves the load beam so deflected, allowing it to establish a new free state with minimal residual stress remaining in the material of the beam. The assembly is then retested and retreated, if necessary, under varying angles of torsional stress until its static roll characteristics fall within acceptable tolerances. An adaptive control algorithm may be utilized to optimize the process, so that successive suspension assemblies in a manufacturing batch are automatically processed with progressive efficiency to achieve target set points.