Browse Prior Art Database

Polarity Identification by Automated Application of Marking Dots

IP.com Disclosure Number: IPCOM000116361D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Axt, J: AUTHOR [+3]

Abstract

This article describes a process to mark the wire ends of head signal leads of Head Gimbal Assemblies (HGAs) by a fully automated application of clearly visible marking dots consisting of a UV curing adhesive.

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This is the abbreviated version, containing approximately 72% of the total text.

Polarity Identification by Automated Application of Marking Dots

      This article describes a process to mark the wire ends of head
signal leads of Head Gimbal Assemblies (HGAs) by a fully automated
application of clearly visible marking dots consisting of a UV curing
adhesive.

      Today's DASD file products typically consist of disks and
actuator ASMs with the HGAs attached to the actuators.  Typically,
the A/E (arm electronics) are integrated into flex cables (containing
the electronics, integrated leads and termination pads) which are
attached to the actuators.

      A critical operation for Actuator Assembly is attaching the
wire ends of HGAs to the corresponding pads on the actuator; in case
of MR Head technology, four wires per HGA need to be terminated onto
the corresponding pads.  To date, four differently coloured wires are
used in order to assure visible determination of each wire's
polarity.  This approach implies severe capacity limitations due to
the automated wire stringing process.

      Instead of using these four differently coloured wires, the
described process uses only two wire colours and, in addition, two
wires of each colour are being marked by an automated application of
marking glue dots resulting in a clear identification of the open
wire end polarities.

      The marking dots are applied in an area where they are visible
to the opeartor in the field of view of the microscope and in that
area of the wire which will an...