Method of manufacturing a double sided flex circuit for a disk drive wherein a first side lead provides an etching mask for a second side lead
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United States of America Patent
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Jun 16, 2015
Grant Date -
Sep 22, 2011
app pub date -
May 30, 2011
filing date -
Nov 1, 2007
priority date (Note) -
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Abstract
A method of manufacturing a flex circuit is disclosed for a disk drive comprising a disk, a head actuated radially over the disk, and control circuitry. The flex circuit is for electrically coupling the head to the control circuitry and comprises a substrate. An electrical coating applied to a first side of the substrate is etched to form a first electrical lead. The first side of the substrate is irradiated with radiation such that the first electrical lead masks the radiation from passing through the substrate to prevent curing of a photoresist applied to the second side of the substrate to form an uncured photoresist and a cured photoresist on the second side of the substrate. The uncured photoresist is removed from the second side of the substrate to form a groove, and the groove is filled with electrically conductive material to form the second electrical lead.
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