Patent ID: 6428658
Filing Date: 2002-08-06
Classification: G11B

Abstract:
A method for manufacturing magnetic head suspensions, comprising the steps of:measuring a variation in curvature in a width direction of a long-sized metal substrate in a partial region; selecting a metal substrate where said variation in the curvature is not more than a given value; and forming a plurality of magnetic head suspensions by sequentially forming an insulating layer and a conductor layer on said selected metal substrate while conveying said metal substrate in a length direction, wherein said step of measuring said variation in the curvature comprises the steps of: extracting a plurality of snipe-like test pieces extended and arranged along the width direction of said partial region of said long-sized metal substrate, setting three or more measuring points on each of said extracted test pieces along their length direction, measuring heights of said three or more measuring points set on each said test piece, obtaining a curvature of each said test piece on the basis of the heights of said three or more measuring points measured for each said test piece, and calculating said variation in the curvature from the curvatures of said plurality of test pieces.